auto reclosure shall be blocked for faults in the cables.” under para 15.3, it was also mentioned...

Agenda for the 83rd

Meeting of PCSC scheduled to be held on 16th

May, 2019 Page 1

SOUTHERN REGIONAL POWER COMMITTEE BENGALURU

Agenda for the 83rd Meeting of Protection Coordination Sub-Committee of SRPC to be held on 16th May, 2019

1. Introduction

2. Confirmation of Minutes of last PCSC meeting

Confirmation of minutes of 82nd Protection Coordination Sub-Committee meeting held on 28th March 2019.

3. Grid Occurrences

3.1 Grid Disturbances (GD), Grid Incidences (GI), and trippings due to failure of Auto-

reclosing (A/R), and mal-operation of PLCC equipment that occurred during the period February – April, 2019 given at Annexure-I would be discussed in the PCSC meeting.

Constituents are requested to furnish the following information in respect of the above grid occurrences to have fruitful discussions.

(a) Single line diagram of the station with switching devices, CT, PT and relay details. (b) Cause of the tripping & Remedial Action taken (c) Relay setting details

Constituents are requested to bring/ furnish full particulars of the tripping events pertaining to their system.

3.2 In compliance of Regulations 5.2 (r) of IEGC, the Constituents are required to furnish

the following information in respect of Grid Occurrences within 24 hrs of occurrence of the same to SRLDC/ SRPC: (a) First Information Report (FIR) (b) Event Logger (EL) output (c) Disturbance Recorder (DR) output (d) Trip event analysis report (with pre and post fault system conditions) Non-furnishing of tripping details (FIR/DR/EL/TR) for the period 01.03.2019 – 25.04.2019 had been brought to Constituents’ notice vide letters (i) No. SRPC/ SE-III/ PCSC/ 2019/ 1471-83 dated 20.03.2019, (ii) No. SRPC/ SE-III/ PCSC/ 2019/ 1887-901 dated 09.04.2019 and (iii) No. SRPC/ SE-III/ PCSC/ 2019/ 2027-43 dated 23.04.2019. Non-compliance in this regard would be discussed in the meeting.

4. Submission of Reports/ Compliance by Constituents

4.1 Status of implementation of pending Protection Coordination

Sub-Committee (PCSC) Recommendations

The status of implementation of pending PCSC recommendations (up to 82nd PCSC meeting) is given at Annexure-II. The latest status on the same may please be sent latest by 03.05.2019.

Agenda for the 83rd


May, 2019 Page 2

4.2 Remedial measures for "Transmission Elements under Forced Outage"

The Constituents are requested to furnish the remedial measures/ actions taken by them for the tripping events as circulated vide our emails. (Annexure-III)

The tripping events are based on the daily reports at SRLDC website http://srldc.in/Reports.aspx under the menu: Reports->Daily-> "TL under Forced Outage")

4.3 Certificate for Healthiness of Batteries

As per the MoP direction given in pursuant to recommendations of the Enquiry Committee (NEW grid disturbance on 30th & 31st July, 2012), RPC’s are required to obtain from their respective Constituents the monthly certificate for healthiness of batteries, installed at 220 KV and above voltage level Substations (for power supply to Relays, RTUs and PLCC equipment) and furnish the same to CEA/ MoP.

With reference to above, the Constituents have been requested to submit the certificate on healthiness of batteries on monthly basis (i.e. status for a month shall be sent by the 7th day of the following month) to SRPC Secretariat.

The sought status for the month of March, 2019 is awaited from the following SR-Constituents:

PED, PGCIL (SR-I), NTPC (Ramagundam), TPCIL

5. Operationalization of Data Modification Notification System (DMNS) for the States

of Southern Region

On the above subject, SRPC vide (i) letter no: SRPC/ SE-III/ PMS/ 2018/ 5124 – 146 dated 03.08.2018 & subsequent reminder mails, and (ii) letter no: SRPC/ SE-III/ PMS/ 2018/ 7242-62 dated 16.11.2018 & subsequent reminder mails had requested the Utilities of Tamil Nadu & Puducherry & Kerala & Telangana and Andhra Pradesh & Karnataka respectively to furnish the details of their Users who are responsible for calculating relay settings and/ or intimating calculated relay settings to the field to SRPC Secretariat ([email protected]) so as to create their respective DMNS Accounts. However, it is noted with concern that details in this regard are still awaited from the following Utilities:

Lanco KPL Since DMNS has already been operationalised w.e.f. 10.09.2018, it is requested from the above Utilities to kindly furnish the sought details without further delay. In this regard, it is also requested from all Utilities (including SLDC’s) of Tamil Nadu, Kerala, Telangana, Puducherry, Andhra Pradesh, and Karnataka & SRLDC to regularly use DMNS application for intimating further changes that have taken place at the stations falling under their control.

http://srldc.in/Reports.aspx

mailto:[email protected]

Agenda for the 83rd


May, 2019 Page 3

6. Confirmation of Orderliness of Protection SLD’s for the States of Southern Region

The Protection SLD's of various Stations of the states of Tamil Nadu & Kerala & Puducherry &

Telangana & Andhra Pradesh & Karnataka (included in PMS project & visited by PRDC) prepared

by PRDC were circulated through mails for confirmation of orderliness of the same. The List of

Protection SLD’s and the status of their confirmation by utilities is attached in Annexure-IV.

It is requested from all Utilities of the states of TamilNadu & Telangana & AndhraPradesh &

Karnataka, who have not furnished the required comments, to take steps to furnish the same on

priority basis to us latest by 09.05.2019 without fail. Non-Compliance of the same will be

discussed in the meeting.

7. Training Program on Protection Database Management System (PDMS) and DMNS

Training Program on using various modules of Protection Database Management System (PDMS)

and Data Modification Notification system (DMNS) would be imparted by M/s PRDC Pvt. Ltd. to

SR-Constituents as per the following schedule:

Sl. No. Training Schedule Location Utilities

1 13.05.2019 – 14.05.2019 KPTCL HQ, Bengaluru KPCL & KPTCL

2 20.05.2019 – 21.05.2019 SRPC Secretariat,

Bengaluru

PGCIL (SR-II),

NTPC, NPCIL,

NLCIL, SRLDC &

SRPC

3 27.05.2019 – 28.05.2019 KSEBL HQ,

Trivendrum

KSEBL

4 30.05.2019 – 31.05.2019 Tstransco HQ,

Hyderabad

TSGENCO,

TSTRANSCO &

PGCIL (SR-I)

5 03.06.2019 – 04.06.2019 TNEB HQ, Chennai TANGEDCO &

TANTRANSCO &

PUDUCHERRY

6 11.06.2019 – 12.06.2019 APTRANSCO HQ,

Vijayawada

APGENCO, &

APTRANSCO

TANTRANSCO, KPTCL, TSTRANSCO, APTRANSCO and KSEBL are requested to kindly coordinate with the utilities attending training and make necessary arrangements for the training programme(with necessary paraphernalia) at their Head Quarters and as per above schedule, and cooperate with M/s PRDC Pvt. Ltd. to gain best out of their expertise. Details for creation of PDMS user account is still awaited from the following utilities:

APGENCO – Thermal, NTPC-Solar, HNPCL, Sembcorp, JSWEL, NTPC-Kayamkulam, NPCIL (MAPS)* and all private utilities

The above utilities are requested to furnish the sought details in proper format by 15th May 2019. *Note: NPCIL(MAPS) submitted the details but not in proper format.

Agenda for the 83rd


May, 2019 Page 4

8. Line Differential Protection Schemes

As per MoM of 7th NPC meeting , the following details regarding Line Differential Protection (LDP) have been mentioned (para 15):

Sub-Committee on Relay/ Protection under task Force for Power System Analysis recommended the following (under para 15.1) regarding Implementation of Line Differential Protection (LDP) : “Many transmission lines are now having OPGW or separate optic fiber laid for

the communication. Where ever such facilities are available, it is recommended to

have the line differential protection as Main-1 protection with distance protection

as backup (built-in Main relay or standalone). Main-II protection shall continue

to be distance protection. For cables and composite lines, line differential

protection with built in distance backup shall be applied as Main-1 protection and

distance relay as Main-II protection. Auto reclosure shall be blocked for faults in

the cables.”

Under para 15.3, it was also mentioned that, a subgroup under National reliability Council for Electricity (NRCE) (constituted after seeking nominations from RPCs, POSOCO and CPU for preparation of reliable standards for protection system and communication system) has proposed the following in respect of LDP:

“For transmission line having voltages at 220kV and above: High speed duplicated

Main protection (Main-I & Main-II) shall be provided and at least one of them being

carrier aided non-switched four zone distance protection. The other protection may be

a phase segregated current differential (this may require digital communication) or a

carrier aided non switch distance protection. wherever OPGW or separate optic fiber

laid for the communication is available, Main-I and Main-II protection shall be the

line differential protection with distance protection as backup (built-in Main relay or

standalone ) shall be provided mandatorily as Main-I and Main-II.).”

General guidelines for implementing Line Differential Protection (valid for both existing and new

transmission lines) issued vide MoM of PCSC-59 dated 22.11.2016 are as follows:

All 220/ 230 kV transmission lines of length < 10 km

All 400 kV transmission lines of length < 50 km

All 220 kV & above dedicated transmission lines of Generators with installed

capacity > 200 MW

Critical corridors to be decided on case to case basis.

In case of existing 220 kV & above transmission lines satisfying above guidelines, LDP may

be implemented in a phased manner.

In case of new 220 kV & above transmission lines satisfying above guidelines, provision

for LDP may be made by including them in tender specification itself.

In this regard, SR utilities shared the following apprehensions regarding LDP, in meeting held on

25.04.2019 (Communication meeting) at SRPC Bengaluru:

Direct Connection between Relays:

Fibers

Tx

Rx Tx

Rx

Relay Relay

Agenda for the 83rd


May, 2019 Page 5

While using the scheme of direct connection between relays through OPGW for LDP, the relays are connected directly & exclusively using two fibers Tx and Rx. In order to obtain redundancy, another set of fibers (2 in number) are used. Hence, a total of four fibers are required for Main-I protection. Similarly, another four fibers are used for Main-II protection. Consequently in this scheme single direction communication itself mandates a total of eight fibers.

Relays connected using C37.94 Interface: In order to reduce the number of OPGW fibers being used for LDP, utilities suggested the

following: One direct OPGW fiber channel separately for Main-I and Main-II relays for LDP

communication in one single direction. Hence, a total of 4 channels for communication in both direction by Main-I and Main-II at both ends.

Instead of using OPGW fiber channel as redundant communication medium, Main-I and Main-II relays at both end can be connected to MUX/SDH via C37.94 interface and can be communicated to other relay at far end station over existing fibers used for voice and data communication as shown below:

If Latency or time delay is main parameter for differential protection, (since in the

case of large distances, latency will occur) then it should be discussed with relay vendor so as to make it suitable for using C37.94 interface.

In this regard, utilities raised the following queries:

Whether C.37.94 interface alongwith MUX/ SDH can be used as the redundant

communication in LDP in place of direct OPGW and the maximum distance of line which

can be covered under LDP?

Is redundant channel mandatory for Differential Protection Relay?

Suggestions & discussions related to the above matter are invited from the utilities in the

forthcoming meeting.

9. Implementation of A/R at MAPS

The issue of implementation of Auto-reclosure on all 220kV and above transmission lines of Southern Region was discussed in TCC-30 & SRPC-31 meetings held on 24-25 February, 2017, and subsequently all Constituents furnished the detailed Action Plan for implementing A/R in their 220 kV & above voltage level transmission lines in PCSC-62 to PCSC-65 meetings.

The logics for implementation of A/R agreed upon by SR constituents and issued vide MoM of PCSC -62 (Annexure-V) clarified the following:

Normal single-shot, single-ph A/R scheme (with simultaneous opening at both ends of feeder with a dead-time of 1 sec and reclaim-time of 25 sec)

Relay

C37.94

Relay

MUX/SDH MUX/SDH

C37.94

C37.94 C37.94

fibers

Agenda for the 83rd


May, 2019 Page 6

Time-Differentiated single-shot, single-ph A/R scheme [suitable for stations having

concerns relating to closing on to un-cleared fault, esp. Generators (Coal/ Gas/ Nuclear/ Hydro)]: “In this, after a line has been opened from both ends (generator end & grid end) on A/R operation, the grid end will be auto-reclosed as usual after the elapse of its dead-time (say, 1 sec). However, the generator end relay will check for the line voltage after elapse of an elongated dead time, say 1.5 sec [here the additional time delay of 0.5 sec, which has been included as a safety time margin, shall be chosen more than Zone-2 time delay & less than PDR time delay]. If the line voltage so sensed is healthy & normal (which implies that the fault has already been cleared), then generator end will be auto-reclosed; else 3-ph trip will be given at generator end to open the other two phase poles.”

It was also clarified that A/R implementation on lines connecting two generating stations is optional. The scheme and settings for A/R proposed by MAPS for the four feeders, 230kV MAPS – S.P.Koil-1, 230kV MAPS-S.P.Koil-2, 230kV MAPS – Echur, and 230kV MAPS –Acharapakkam is as given below: Three phase, time delayed auto reclose, Follower to other end breaker (Lead) with

voltage supervision and synch check, Live bus/Live line reclosing Auto Reclose. Dead time: 10.6 sec (600ms dead time of lead breaker+ 10s Reclaim time of lead breaker)

and Reclaim time: 10 secs. Number of shots: 1 Auto reclose will be configured in Main 1 protection for all Zone-1 single phase-earth fault

and PUTT (Ph-E) fault. For all other faults auto reclose is blocked and three phase trip will be configured.

PSAG-14 conducted at NPCIL (MAPS) on 16th December 2015 had recommended ‘lead-follow scheme’ 1-ph or 3-ph A/R at MAPS (Annexure-VI) with a dead time of 1.5 sec.

The issue (A/R settings) would be further discussed in the PCSC meeting. 10. Other Protection Issues, if any, with the permission of the Chair

11. Sending Agenda items for the PCSC meetings

As per the Guidelines of CEA/MOP, it has been decided to conduct the PCSC meetings on monthly basis. It is requested that Agenda Items for the PCSC meetings, if any, may please be sent latest by 5th working day of the month to SRPC Secretariat to compile and circulate the same so as to have fruitful discussions in the PCSC meetings.

12. Date of next PCSC meeting

It is informed that the 84th meeting of PCSC will be held on 27th June, 2019 (Thursday) from 10:30 hrs onwards in the Conference Hall of SRPC Secretariat, Bengaluru.

*****

Grid Occurrences to be discussed in the 83rd Meeting of PCSC scheduled to be held on16th May , 2019 1/6

Grid Occurrences - 83

For all tripping events involving failure of substation equipment, Constituents are requested to kindly furnish the SLD or equivalent pictorial representation showing (i) Location of the fault, and (ii) Bus-bar arrangement/ Configuration of feeders and other connected equipment with proper CB positions (OPEN/ CLOSE) at the time of occurrence of the fault.

I. Details of Grid Disturbances:

Sl. No.

Details of Event Date &Time Reason Remarks Category

1

Complete outage of 230kV Veeranam substation of TANTRANSCO

11-03-2019 at 00:55 Hrs

Triggering incident was Y-phase CT blast in 230kV Tirunelvelli (Abhishekpatty) – Veeranam Ckt-1. 230kV Trirunelvelli – Veeranam Ckt-1 and 2 tripped. Two faults were observed from the PMU plot. During the second fault, delayed fault clearance of 400ms was observed. As reported, other connected feeders 230kV Veeranam – Kodikur ckt-1&2 and 230kV Veeranam – Kayathar tripped on Zone -2 protection.

GD-1

2

Complete Outage of 400kV Singareni Generating Station of TSGENCO, 400kV Ramadugu SS and 400kV Medaram SS of TSTRANSCO

12-03-2019 at 17:03Hrs

During testing of Thippapur bay (New Element) at 400kV Ramadugu, all connected 6 feeders of 400kV Ramadugu got tripped due to spurious DT (Direct Trip) Receive. 400kV Medaram SS is connected only to 400kV Ramadugu SS. Hence this resulted in complete loss of supply at 400kV Medaram SS and 400kV Ramadugu SS. After the tripping of 400kV Ramadugu - Singareni 1&2, running unit#1 and 2 of 400kV Singareni Generating Station got tripped. 400kV SingareniSundilla 1&2 were hand tripped at Singareni end.

Gen Loss:1135

MW Load loss: 250 MW

GD-1

3

Complete outage of 220kV/132kV Chinakampalli Substation of APTRANSCO

25-03-2019 at 04:13Hrs

Triggering incident was failure of B-ph CT of Bus Coupler at 220kV Chinakampalli SS. Bus bar protection of Bus-1 and Bus-2 operated resulting in the tripping of all the connected elements at 220kV Chinakampalli SS. 400kV/220kV ICT#1, 2 and 3 at Cuddapah also got tripped during this event.

Load Loss: 285 MW

GD-1

4 Complete outage of 220kV Kadakola substation of KPTCL

08-04-2019 at 22:48Hrs

220kV Kadakola – Mysore ckt-1 and 2 tripped on distance protection due to B-phase to ground fault. 220kV Kadakola – Kaniyampeta and 220kV Kadakola – Chamrajnagar ckt-1 & 2 were handtripped at Kadakola end to avoid tripping due to overloading. This resulted in

Load Loss: 250 MW

GD-1

Annexure-I


complete loss of supply at 220kV Kadakola station

5

Complete Outage of North Kerala and 220kV Areakode SS of KSEB

10-04-2019 at 23:05Hrs

220kV Areakode SS was under split bus operation during antecedent conditions. It was intended to shift 220/110KV, 160 MVA Transformer at Areakode from bus-1 to bus-2. During shifting, both the buses got coupled through R and Y ph bus isolators. This resulted in R-Y ph bus fault and bus bar protection operated at 220kV Areakode SS resulting in the tripping all the connected elements. After the tripping of all 220kV Kozhikode Areakode lines, due to overvoltage, 400kV Kozhikode Mysore line-2 got tripped at Kozhikode end and DT was received at Mysore end.

Load Loss: 820 MW and Gen Loss: 230

MW

GD-1

6

Complete outage of 220kV Hubli substation of KPTCL and 220kV Nagjheri Power station of KPCL

10-04-2019 at 18:09Hrs

Y and B-phase earth isolator switch blades of 220kV Hubli-Bidnal ckt-1, got closed due to failure of locking mechanism during heavy wind and rain conditionsresulting in bus fault. Bus bar protection operated and all connected elements tripped. There was complete loss of supply at 220kV Hubli station since the station was on single bus operation. At thesame time, 220kV Nagjheri-Ambewadi ckt-1 and 220kV Nagjheri – Bidnal tripped on overcurrent protection. Since 220kV Nagjheri – Ambewadi ckt-2 and 220kV Nagjheri-Kodasalli ckt-1 &2 wereunder shutdown in the antecedent due to maintenance, running units #1,4,5 and 6 tripped due to loss of evacuating lines. This resulted in complete loss of supply at 220kv Nagjheri station.

Load Loss: 60 MW and gen. Loss: 450 MW

GD-1

7

Complete outage of 230kV/110kV KR Thoppur Substation of TANTRANSCO

11-04-2019 at 13:16Hrs

Triggering incident was failure of Y-ph CT of Bus Coupler at 230kV KR Thoppur(Salem) SS. Bus bar protection of Bus-1 and Bus-2 operated resulting in the tripping of all the connected elements at 230kV KR Thoppur SS. 400kV/230kV ICT#1 and 2 at Salem also got tripped during this event.

Load Loss: 24 MW

GD-1

Annexure-I


II. Details of Grid Incidents:

Sl. No. Details of Event Date &Time Reason Category

1 Tripping of 400kV/230kV ALAMATHY ICT-5

21-02-2019 at 11:07hrs

400/230kV ICT-5 at Alamatty tripped on WT (winding temperature) and OT (oil Temperature) trip indications due to DC leakage while changing the fan control contactor of ICT-4

GI-2

2 Tripping of 400/220 kV ICT-1 AT GAJWEL

22-02-2019 at 10:26hrs

400/220kV ICT-1 at Gajwel tripped on winding temperature relay indications while checking the winding temperature setting

GI-2

3 Tripping of 400/230 Kv ICT 2 AT THIRUVALLAM

24-02-2019 at 07:38hrs

400/230kV, ICT-2 at Tiruvallum tripped on operation of Pressure Relief Device (PRD)

GI-2

4 Tripping of 400 kV KOLAR - TIRUVALLUM

24-02-2019 at 15:18hrs

Y-phase to earth fault occurred in line. Auto-reclose was not successful at both ends as fault was persistent in nature. From Kolar end DR, it is observed that zone-2 got operated during auto-reclose attempt instead of carried aided protection.

GI-2

5 Tripping of 400KV/220KV JULURUPADU-ICT-1

25-02-2019 at 23:30hrs

400/220kV ICT-1 at Julurupadu tripped on differential protection for fault on 220kV Julurupadu-Peddagopathi-2 feeder. Suspected mal operation of the relay for through fault

GI-2

6 Tripping of 400/220 kV ICT-2 AT NEELAMANGALA

02-03-2019 at 13:54hrs

Suspected trip due to temporary DC Ground. GI-2

7 Tripping of 400KV-TALARCHEVU-JAMMALAMADUGU-2

03-03-2019 at 18:02hrs

400kV Talarichevu - Jamalamadugu ckt-2 tripped on operation of overvoltage, Stage-1 protection at Talarichevu end and DT received at Jamalamadugu end. From Talarichevu end DR, phase voltages were: Vr-114.3kV, Vy-228kV and Vb-344kV. Wide differences in phase voltages observed.

GI-2

8 Tripping of 400/230 kV ICT-2 AT SRIPERUMBUDUR

08-03-2019 at 18:01hrs

Triggering incident was failure of B-phase LV side LA of ICT#2. ICT#2 tripped on differential protection operation.

GI-2

9 Tripping of 400 kV GUTTUR - NARENDRA -1

10-03-2019 at 18:03hrs

Line tripped on operation of overvoltage stage-1 protection at Guttur end and DT received at Narendra end. Voltages at Guttur end: Vr-254kV, Vy-252kV, Vb-246kV. As per voltage grading, 400kV Guttur Narendra line-2 should trip first.

GI-2

Annexure-I


10 Tripping of 400kV KaigaGuttur line-2

11-03-2019 at 01:49hrs

Triggering incident was R-N fault in 400kV KaigaGuttur line-2. At Kaigaend, fault was sensed in Zone-1. But LBB of main breakerof the line operated due to struck breaker conditionof B-phresulting in tripping of all main CBs of bus-1 and DT sent. Pole discrepancy operated due to suspected non-opening of B-ph breaker. At Guttur end, fault was sensed in zone-2, carrier received and AR attempted. But during AR operation, line got tripped due to DT receive from other end.

GI-2

11 Tripping of HVDC TALCHER - KOLAR LINE 2

12-03-2019 at 13:02hrs

HVDC Talcher-Kolar Pole-2 tripped due to line fault at Talcher end. Talcher – Kolar pole-1 continued operation in ground return mode. HVDC Talcher-Kolar pole-2 had entered reduced voltage operation due to the repeated line faults, however, due to reoccurrence of the line fault the pole finally tripped.

12 Tripping of 400/220 kV ICT-2 AT Cuddapah

13-03-2019 at 09:07hrs

400/220kV, 315MVA ICT-2 at Cuddapah (Chinakampalli) tripped due to damage of control cable during excavation at 220kC APTRANSCO switchyard. 400kV side didnot trip

GI-2

13 230kV Bus dead at 230/110 kV Pugalur

14-03-2019 at 13:24 hrs

Triggering incident was R-phase breaker failure in 230kV Pugalur end of Budansandhai feeder. LBB operated resulting in tripping of all connected elements. As reported, 230kV side was on single bus operation since bus sectionalizer provision is not there. 110kV side connected feeders did not trip.

GI-1

14 Tripping of 400/110 kV ICT-4 AT SRIPERUMBUDUR

15-03-2019 at 13:25hrs

110KV SriperumpudurI.G.Kottai line tripped on Zone-1, distance protection due to B-N fault. At the same time, ICT#4 got tripped due to Bucholz relay operation.

GI-2

15 Tripping of 400kV Maradam-Kalpakka-1

15-03-2019 at 14:48hrs

Line tripped during testing of DC leakage at Maradam end.Feeder didnot trip at Kalpakka end

GI-2

16 Tripping of 400/220 kV ICT-4 AT Gajwel

21-03-2019 at 10:13hrs

400/220kV ICT-4 at Gajwel tripped on PRV tank-2 indications. Suspected maloperation due to problem with auxillary relay and its wiring

GI-2

17 Tripping of 400kV Krishnapatnam – Nellore ckt-1

23-03-2019 at 04:41 hrs

Feeder tripped due to severe tracking on line insulator stacks.

GI-2

18 Tripping of 400/230 kV ICT-1 AT SALEM

29-03-2019 at 18:14hrs

ICT tripped on winding temperature high alarm GI-2

19 Tripping of 400 kV NCTPS – Vallur- 2

30-03-2019 at 04:19hrs

Feeder tripped due to heavy tracking on line insulator stacks.

GI-2

20 Tripping of 220kV VTS-Talapalli ckt-3 and Generating Units#1,2,3,4,5 & 6 at VTS.

01-04-2019 at 22:58hrs

220kV VTS – Talapalli ckt-4 was under maintenance. While restoring the feeder, 220kV VTS – Talapalli ckt-3 tripped on Zone-1 distance protection due to B-N fault. At the same tine VTS unit# 1 & 2 tripped on Loss of fuel and Generators 3,4,5&6 tripped on Generator Negative phase sequence protection.

GI-1

21 Tripping of 400kV NP Kunta – Cuddapah ckt-2

03-04-2019 at 00:44hrs

Feeder tripped on operation Gas Zone protection at CuddapahGIS end due heavy gas

GI-2

Annexure-I


leak from B-phase circuit breaker and direct trip received at NP Kunta end.

22 Tripping of HVDC TALCHER - KOLAR Pole-1

11-04-2019 at 13:01hrs

Pole-1 tripped on generation of external protection trip due to failure of control card (AVR/ACR) of Charger-1. Due to failure of the control cards there was power supply fault in both VBE (Valve Based Electronics) Systems.

GI-2

III. Details of Trippings due to Failure or Non-operation of Auto-Reclose:

Sl. No. Element Date & Time Reason

1 Tripping of 220 kV Kayamkulam –Punnapura-2

24-02-2019 at 03:05hrs

Line tripped on B-phase to earth fault. Auto-reclose was successful at Punnapura. A/r was not attempted at Kayamkulam and there was pole discrepancy operation resulting in tripping of R and Y pole of CB.

2 Tripping of 220 kV Kayamkulam –Punnapura-2

05-03-2019 at 00:30hrs

220kV Kayamkulam-Punnapura -2 tripped on Zone-1 distance protection due to R-N fault. Auto reclose operated and successful at Punnapara end but didnot operate at Kayamkulam end.

3 Tripping of 400kV Khammam-Kalpakka ckt-1

06-03-2019 at 14:18hrs

400kV Khammam-Kalpakka ckt-1 tripped on Zone-1, distance protection due to Y-N fault. AR was successful at Khamman end but didnot operate at Kalpakka end due to carrier failure. Volatges at Kalpakka end raised and overvoltage Stage-1 operated at Kalpakka end and DT was sent to Khammam end. From DR of Kalpakka end voltages are: Vr-252kV, Vy-253kV and Vb-253kV.

4 Tripping of 400 kV Neyveli TS 2- Salem 2

07-03-2019 at 12:38hrs

400kv Neyvelli TS2 - salem ckt-2 tripped on R-N fault due to insulator decapping. At Neyvelli TS2 end, autoreclose was initiated by Main-1 (7SA52) relay but Main-2 (Micom P444) relay issued a three phase trip command due to mistake in wiring. At Salem end, auto reclose operated and locked out

5 Tripping of 400kV VTPS-Suryapet-2

14-03-2019 at 13:52hrs

Line tripped on distance protection due to R-N fault. At VTPS-IV end, auto reclose didnot operate. As reported, newly retrofitted SIEMENS make relay initiated three phase trip.Auto reclose operated and successful at Suryapet end

6 Tripping of 400kV Julurpadu - Manuguru line-2

14-Mar-2019 06:10:00

Triggering incident was R-ph fault in the line. At Julurpadu end, fault was sensed in Zone-2 and carrier was received but due to DT Receive from manuguru end, A/r not operated and line got tripped. FIR, DR and EL of Manuguru end are not available.

7 Tripping of 400kV Khammam Kalpaka line-2

15-03-2019 at 12:24hrs

There was R-N fault in the line. Auto reclose operation was successful at Khammam end and due to failure of PLCC at Kalpaka end, auto reclose not operated at Kalpaka end and line tripped on Zone-1 DPR at Kalpaka end.

8 Tripping of 400 kV VTPS - Nellore

24-03-2019 at 12:46hrs

Feeder tripped on Y -N Fault. Auto reclose operated at Nellore end but not operated at VTPS end.

Annexure-I


9 Tripping of 230kV Neyveli – Villianoor

28-03-2019 at 06:37hrs

Feeder tripped on Zone-1 distance protection due to B-N fault. Auto reclose didnot operate at Neyvelli end. Auto reclose operated and successful at Villianur end.

10 Tripping of 400 kV RTPS - Raichur PG ckt-2

03-04-2019 at 19:37hrs

B-N fault in line. Auto reclose successful at RTPS end but did not operate at Raichur PG end and the breaker tripped.

11 Tripping of 400KV Suryapet – Kethireddipalli -1

07-04-2019 at 16:53hrs

R-N fault in the feeder. A/R operated and successful at Suryapet end but did not operate at Kethyreddipalli end. OVR stage-1 operated at Kethyreddipalli end and DT received at Suryapet end.

IV. Details of Trippings due to PLCC mal-operation:

Sl. No. Element Date & Time Reason

1 Tripping of 400kV Hiriyur

Neelamangala-1 08-03-2019 at 09:57hrs

Line tripped at Neelamangala end only due to receipt of direct trip and line was holding from Hiriyur end. Suspected PLCC mal-operation had caused the tripping.

2 Tripping of 400kV Kundara -

Kayamkulam ckt-1 09-03-2019 at 12:44hrs

220kV Kundara - Kayamkulam ckt-1 tripped on DT received at Kayamkulam end. Kundara end didnot trip. No fault observed from the DR. Suspected PLCC maloperation.

3 Tripping of 400kV Maradam-

Kalpakka-2 11-03-2019 at 16:49hrs

Line tripped at Kalpakka end only due to receipt of direct trip and line was holding from Maradam end. Suspected PLCC mal-operation had caused the tripping.

4 Tripping of 400kV Khammam -

Kalpakka ckt-1 19-03-2019 at 17:34hrs

Line tripped due to maloperation of PLCC channel. Spurious direct trips were received at Kalpakka end from the other end, as a result voltage at Kalpakka end increased.Overvoltage stage-1 protection operated at Kalpakka end and DT sent to Khammam end

5 Tripping of 400 kV Raichur -

Munirabad 10-04-2019 at 15:52hrs

During handtripping of 400kV Raichur-Veltoor-1, DT was sent spuriously to Munirabad end from RTPS end. Feeder did not trip at Raichur end.

6 Tripping of 400 kV Kurnool -

Srisailam 11-04-2019 at 14:28hrs

Feeder tripped on DT receipt indicatins at both ends. Suspected PLCC maloperation.

Annexure-I

Meeting

No /

Index

Details of Event Date & Time Reason PCSC Recommendations Utility responsible for

Implementation

Status of Implementation of PCSC Recommendations Remarks Latest Status

(To be filled up by the Constituent)

47/I/2 Complete outage of

Krishnapatnam TPS

08-09-2015

at 18:20 hrs

Status of Pending Implementation of PCSC Recommendations as on 26.04.2019 (up to 82th Meeting)

KPTCL Mail dated 27-05-2015:

1. KPTCL has taken action to provide bus bar protection to 220kV buses. --- Pending

2. Over current relay Settings of ICTs to be reviewed by PGCIL.

--- Pending

3. --- Pending

KPTCL Mail dated 29-07-2015:

1. Initial Tendering stage. --- Pending

2. --- Pending

3. --- Pending

KPTCL Mail dated on 23-01-2016:

1. Detailed estimate prepared for taking up the work. CEE, Transmission Zone, Gulbarga will

take up necessary procurement and further execution. --- Pending

2. --- Pending with PGCIL (SR-I).

3. --- Pending

PGCIL (SR-I) Mail dated 14.07.2016:

2. Relay settings of all the stations in SRTS-1 were derived as per Ramakrishna Commettee

recomendations and implemented" --- Completed.

KPTCL Mail dated 16.12.2017:

1) & 3). DPR is approved. Tender is to be called by CEE,TZ Kalaburgi --- Pending

Review Meeting dated 19.12.2017:

1. KPTCL informed that Tenders for providing BBP would be called in Jan-Feb, 2018; Supply of

the same is targeted by September, 2018; Erection & Commissioning is targeted by January,

2019

--- Pending

3. PGCIL (SR-I) informed that time-synchronization of 220 kV side is in place. --- Completed.

KPTCL mail dated 19.12.2018:

1. DPR preapared for the work of providing Bus Bar Protection to 220kV buses at Guddadahally

is approved. Tender is to be invited by CEE,TZ .


1. Tender would be floated in January 2019. Works would be completed in 6 months after

awarding PO.

16-07-2014

APGENCO letter dated 18.03.2016:

1.SOE and SLD are attached. The DR of 405 CB is not generated during the incident. Now the

problem is identified and rectified.

--------- Completed

2.All the 3 lines i.e CHTR-2, MNBL-I & II tripped in zone

protection. The fault was in Blind zone i.e P2 side of CT, where it was covered under Bus fault

by the time fault moved on to P1 side when the fault comes under STUB/TEED zone after

330msec all the feeders expect CHTR-1 tripped in Zone-II and total fault persisted for 500msec

before the 405 TIE CB opens and clear the fault. As a remedial the STUB protection operation

also checked and found OK.------- Completed

3.The Time Sync was missed on the day and found there was problem with LAN Timer same

was rectified. Now found OK.

-----------Completed

4.Now the DR Time scale changed to 1 sec for Pre fault and 3 sec for Post fault and STATE of

events are corrected wherever found wrong/or misguiding during analysis.---------Completed.

PGCIL-SR1 RVMD 27-04-2016:

5. Procurement of differential protection for 400kV NPS-NLR D/C and 400kV RCR-RTPS-D/C is

under tendering.

PGCIL-SR1 RVMD 14-07-2016:

5. The proposal for procurement of Line differential Protections for 400kV Raichur - RTPS-1 & 2

and 400kV Nellore - NPS - 1 & 2 lines has been approved and tender is under technical

evaluation


PGCIL: On 23.11.2017 LDP relays commissioned in place of Main-1 distance relay in 400kV NPS-

Nellore line-2 & In line-1 installation of LDP relay is planned in Dec-2017/Jan-2018.


5. PGCIL (SR-I) informed that LDP commissioning on both lines would be completed by

February, 2018. In this regard, PCSC made it clear that the recommendation pertains to

providing LDP as both Main-I & Main-II on both the lines, and asked PGCIL (SR-I) to ensure &

comply with the same.

34/I/6 400/220 kV ICT-1 & 2 at

Munirabad

As reported directional over current relay of ICT’s operated

due to snapping of line jumper in 220kV Lingapur line.

1. Bus bar protection shall be provided by asset owner ( i.e

KPTCL).

2. Settings for main distance protection & Overcurrent

protection shall be examined and reviewed.

3. Time synchronization of the Substation shall be ensured.

KPTCL/

PGCIL (SR-I)

Pending

(with KPTCL)

Multi-Utilities

As per FIR submitted, CT damage observed in Chitoor-Main

bay (404). Main breakers connected to bus-1 (401, 404, 407,

410) got tripped on operation of bus bar protection. Unit-1

tripped on operation of MFT. Unit-2 was not in service

1. APGENCO to furnish to PCSC forum (i) A3-size Single Line

Diagram of SDSTPS, and (ii) the sequence of events with time

stamp showing the protection that opened Tie-CB (405) at

SDSTPS.

2. APGENCO to review STUB/TEED protection in all dias at

SDSTPS and ensure that they are configured for

instantaneous operation.

3. APGENCO to properly configure the STATE of the tripping

events so that they get recorded appropriately like TRIP/

OPERATED in their corresponding Event Loggers.

4. APGENCO to ensure time sync of all DR’s and EL’s at

SDSTPS.

5. PGCIL (SR-I) to provide line differential protection for 400

kV NPS –Nellore-PG lines 1 & 2.

APGENCO/

PGCIL (SR-I)

Pending

[with

PGCIL (SR-I)]

Annexure-II

Page 1 of 36

PGCIL (SR-I) mail dated 20.06.2018:

PGCI(SR1) procuring LDP relays for retrofitting of Main-1&2 distance relays. Tenders are invited

from bidders & tender floated. Technical bid opening in this week.


PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays is schdule for for January,

2019 and commissioning is targed to be completed by March, 2019.

PGCIL (SR-I) mail received on 27-04-2016:

1. The firmware of REL670 is being upgraded. ------- Completed.

2. The recording of events in msec interval is being taken up with OEM. Henceforth, for analysis

purpose, we will provide larm list which has msec time stamp. -------- Completed.

3. End to end testing of PLCC code transmision and tuning of channels carried out. -------

Completed.

4. Procurement of differential protection for 400kV NPS-NLR D/C and 400kV RCR-RTPS-D/C is

under tendering. The legends modified in Event/alarm list. Provision of diff. relay for all short

lines emanating from NPS is being taken up with our corporate.

----- Pending.

PGCIL(SR-I) RVMD 14-07-2016:

4. The proposal for procurement of Line differential Protections for 400kV Raichur - RTPS-1 & 2

and 400kV Nellore - NPS - 1 & 2 lines has been approved and tender is under technical

evaluation --- Pending


4. LDP relays procurement is under process. Procurement will be completed by Feb-2018. TPCIL

has to give written confirmation for LDP relay procurement. For want of written confirmation

from TPCIL, PGCIL approving authority has withheld the LDP proposal.


4. PGCIL (SR-I) informed that they are waiting for written confirmation from TPCIL to complete

procurement of LDP relays. To this, PCSC forum asked TPCIL to submit written confirmation to

PGCIL (SR-I) by 29.12.2017. PGCIL (SR-I) assured that with receipt of above confirmation from

TPCIL by Dec, 2017, they would be able to complete the work by FEbruary, 2018.

APTRANSCO informed that they would be able to implement LDP from their & APGENCO side

by April, 2018.

In this regard, PCSC forum made it clear that the recommendation is about providing LDP as

both Main-I & Main-II relays on all stated lines in Nellore Complex, ans asked all stakeholders to

ensure & comply with the same.





PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be completed by

Jan'2019 and commissioning by Mar'19

Complete outage of TPCIL power

station

PendingRunning units at Thermal Powertech power Station tripped

due to tripping of 400kV Nellore pooling station (NPS)-TPCIL

line and 400kV Nellore pooling station (NPS)-NCC line

47/I/2 Complete outage of

Krishnapatnam TPS

08-09-2015

at 18:20 hrs

PGCIL (SR-I),

MEPL, SEL, TPCIL, NCC

1.PGCIL (SR-I) to furnish Action Taken Report on the findings

of OEM on relay mal-operation at NPS end on 400 kV NPS –

NCC line to PCSC forum.

2. PGCIL (SR-I) to appropriately configure Station Event

Logger at NPS to record events at msec interval.

3. PGCIL (SR-I) to carry out PLCC end-to-end testing in

coordination with TPCIL for 400 kV NPS –TPCIL line.

4.PGCIL (SR-I), MEPL, SEL, TPCIL & NCC to take steps to

provide line differential protection at their respective ends

on all 400 kV lines (except Gooty line) emanating from

Nellore Pooling Station, and furnish an action plan to

implement the same.

As per FIR submitted, CT damage observed in Chitoor-Main

bay (404). Main breakers connected to bus-1 (401, 404, 407,

410) got tripped on operation of bus bar protection. Unit-1

tripped on operation of MFT. Unit-2 was not in service

1. APGENCO to furnish to PCSC forum (i) A3-size Single Line

Diagram of SDSTPS, and (ii) the sequence of events with time

stamp showing the protection that opened Tie-CB (405) at

SDSTPS.

2. APGENCO to review STUB/TEED protection in all dias at

SDSTPS and ensure that they are configured for

instantaneous operation.

3. APGENCO to properly configure the STATE of the tripping

events so that they get recorded appropriately like TRIP/

OPERATED in their corresponding Event Loggers.

4. APGENCO to ensure time sync of all DR’s and EL’s at

SDSTPS.

5. PGCIL (SR-I) to provide line differential protection for 400

kV NPS –Nellore-PG lines 1 & 2.

APGENCO/

PGCIL (SR-I)

Pending

[with

PGCIL (SR-I)]

30-12-2015 at

06:02hrs

50/I/2

Annexure-II

Page 2 of 36

APTRANSCO mail dated on 31-08-2016:

To avoid the unwanted malopeartions due to the external LBB trip initiation from PGCIL, Vide

letter Dt: 04-08-2016, APTRANSCO has requsted the PGCIL to arrange the Master trip relay and

breaker contacts of ICT-1 &2 LV side to enable the internal LBB feature in the Busbar protection

scheme at 220kV Gooty Switching station. Waiting for the PGCIL response.


To avoid the unwanted maloperations due to the external LBB trip initiation from PGCIL, vide

letter Dt: 04-08-2016, ARTRANSCO has requested the PGCIL to arrange the Master trip relay

and breaker contacts of ICT-1&2 LV side to enable the internal LBB feature in the Busbar

protection scheme at 220kV Gooty Switching station. Waiting for the PGCIL response.


Waiting for the PGCIL response.

APTRANSCO mail dated 04.03.2017 & 24.05.2017.

SRPC is requested to coordinate with PGCIL in takind necessary action.

APTRANSCO mail dated 20.09.2017 & 22.11.2017

PGCIL may be requested to take necessary actionAPTRANSCO maild ated 15.12.2017:

1. Cable healthiness checked and found ok. But it is proposed to replace the cable with

armored cable. --Completed

2. After replacing the cable contactors will be removed so as to avoid unwarrented delays in

transmitting trigging signal to the central unit . ---Pending


APTRANSCO informed that replacement of the existing cable with armoured cable and

subsequent removal of cable contactors would be completed by 31.12.2017. In this regard,

PGCIL (SR-I) also assured that they would render all required help from their side to complete

the stated works in time.

APTRANSCO Mail Dated 30.01.2018:

New armoured cable is laid from 220 kv Gooty (AP) to 400/220 kv Gooty (PGCIL) for replacing

the existing cable connected to ICT-2.PGCIL is requested to provide spare contacts from trip

relays of 315 mva LV-1 and LV-2 for providing internal CB failure in busbar protection scheme.

APTRANSCO Mail Dated 24.04.2018 & 24.05.2018:

As requested by PGCIL the busbar drawings Were submitted for providing spare contacts from

trip relays of 315 mva LV-1 and LV-2 for providing LBB in busbar protection scheme.


220kV CB LBB protection (Stand alone protection) available at PGCIL end is to protect ICT in

case of non tripping of CB. It is opined that stand alone protection is better than new LBB logic

proposed by APTRANSCO in Busbar schme. The reason for mal-operation of 220kV Bus on

24.06.2016 is mainly due to cable issue. The problem shall be solved once we replace, this

suspected cable betweem POWERGRID & APTRANSCO.


PGCIL was requested to arrange LC & coordinate for completeing the work.


220kV CB LBB protection (Stand alone protection) available at PGCIL end is to protect ICT in

case of non tripping of CB. It is opined that stand alone protection is better than new LBB logic

proposed by APTRANSCO in Busbar schme. The reason for mal-operation of 220kV Bus on

24.06.2016 is mainly due to cable issue. The problem shall be solved once APTRANSCO replaces

suspected cable, this suspected cable betweem POWERGRID & APTRANSCO.

In this regard a letter dtd 22.09.2018 hasbeen sent to EE, MRT & T/F, Ananthapur, AP TRANSCO

that the required relay contact will not provided by POWERGRID.

Review Meeting held on 20.12.2018:

Cable laying work was completed by PGCIL (SR-I). It was agreed that the work would be

completed by PGCIL (SR-I), in cordination with APTRANSCO, within one month.

APTRANSCO MAIL DATED 22.01.2019:

Pending [ with PGCIL (SR-I) ]

Tripping at 220 kV Gooty

Substation of APTRANSCO

56/II/13 APTRANSCO/

PGCIL (SR-I)

1.APTRANSCO to check the healthiness of the connecting

cable between Gooty (PGCIL) and Gooty (APTRANSCO), and

replace it, if required.

2.APTRANSCO to ensure that the distributed architecture

employed in implementing busbar protection at their Gooty

220 kV SS does not introduce any unwarranted delays in

transmitting the triggering signals to the Central Unit.

LBB protection got operated for 400/220kV ICT-2 breaker

which had resulted in tripping of 220kV Bus-2 at 220kV Gooty

Substation

Pending [ with PGCIL

(SR-I) ]

24-06-2016 at 16:04

hrs

Annexure-II

Page 3 of 36


ABB make LDP relays inspection is completed. SNEIDER make LDP relays inspection yet to be

completed. Delivery of relays expected in the 1st weak of May-2018.


SNEIDER make LDP relays inspection yet to be completed.Delivery of relays expected in the

month of june 2018.





ABB make LDP relays are delivered. Schneider make LDP relays inspection to be offered by the

company.


schneider LDP relays inspection yet to be offered by the company.


ABB make LDP relays for Main-1 protection were delivered earlier and schneider make LDP

relays for Main-2 protection are delivered in this week.


ABB & SCHNEIDER Relays are drawn and available at site. To be commissioned in coordination

with the Alstom (Area) engineers who implemented SAS.


PGCIL(SR-1): PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be

completed by Jan'2019 and commissioning by Mar'19


The relays are yet to be commissioned.

APTRANSCO mail dated 15.03.2019:

Commissioning of LDP relays scheduled in the month of April 2019.

64/I/1 Complete outage of North

Chennai TPS STG-2

24-04-2017

at 21:02hrs

Tripping of evacuating lines due to fault led to tripping of

Units


Issue was addressed to the concerned for necessary action.


Meeting was conducted and the relays procurement for all the loctions is under progress.

APTRANSCO mail dated on 20-10-2017 & 22.11.2017:

Relays procurement for all the locations is under progress.

APTRANSCO Mail dated 15.12.2017:

Technical bids opened. PQ evaluation under progress . Price bids expected to open in next

week.


LDP relays procurement is under process. Procurement will be completed by Feb-2018. TPCIL

has to give written confirmation for LDP relay procurement. For want of written confirmation

from TPCIL, PGCIL approving authority has withheld the LDP proposal.


PGCIL (SR-I) informed that they are waiting for written confirmation from TPCIL to complete



TPCIL by Dec, 2017, they would be able to complete the work by FEbruary, 2018.


by April, 2018.




APTRANSCO MAIL DATED 30.01.2018

Technical & financial bids are opened. Tenders will be awarded shortly.

Triggering incident was snapping of Y phase conductor in

400kV Nellore (PG) - NPS line-1. Distance relay at

Krishnapatnam end over-reached in Zone-1, and resulted in

tripping of 400kV Krishnapatnam – Nellore (AP) lines - 1&2

from Krishnapatnam end. Distance relay at MEPL over-

reached and resulted in tripping of MEPL-NPS line from MEPL

end.

PGCIL (SR-I), TPCIL, MEPL, SEL, SGPL, APTRANSCO, APGENCO

and SDSTPS to implement line differential protection on all

400 kV transmission lines (of length less than 50 km)

emanating from Nellore PS, Nellore (PG) SS, and Nellore (AP)

SS. [It may be noted here that the cut-off length of 50 km has

been specified with a view to exclude only long transmission

lines].

APGENCO/

PGCIL(SR-I)/

TPCIL/MEPL/SEL/

SGPL/ APTRANSCO

Pending

[with TANTRANSCO]

Status received vide TANTRANSCO mail dated 15-06-2017 & 04.08.2017 & 18.09.2017 & 12-12-

2017:

1. All the Porcelain insulators of 400kV NCTPS-II - Vallur feeders-1&2 were replaced with

Polymer insulators by 20.05.2017. -----Completed

2. Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer

insulators in a phased manner.

--- Pending

PGCIL (SR-II) Mail dated 11-12-2017:

Pertaining to POWERGRID all the porceleing insulators in the polluted streches has been

completed. - Completed.


TANTRANSCO informed that a total of 597 insulators ahd alreeady been replaced, and the total

replacement would take another 9-month period.

In this regard, TANTRANSCO was asked to furnish detailed plan of action regarding replacement

of insulators on all 400 kV lines owned by them in Chennai area.

TANTRANSCO MAIL DATED 25.01.2018:

Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer

insulators in a phased manner. Timeline: Sep-2018. Detailed plan of action will be submitted.



insulators in a phased manner. Timeline: Sep-2018.

Pending

TANTRANSCO and PGCIL (SR-II) to take steps to complete

insulator replacement works on the 400 kV lines owned by

them in Chennai area within 3 months.

TANTRANSCO/

PGCIL(SR-II)

18-07-2016

at 19:05 hrs

57/II/9 Tripping of 400 kV Nellore (PG) -

NPS line-1, 400 kV

Krishnapatnam-Nellore (AP)

lines -1&2 and 400kV NPS -

MEPL line

Annexure-II

Page 4 of 36


Chennai TPS STG-2

25-04-2017

at 18:27hrs


Unit


Chennai TPS STG-2

26-03-2017

at 21:09 hrs


running Unit at NCTPS Stg-2












insulators in a phased manner. Timeline: Dec-2018.


1.Replacement of porcelain insulators with Polymer insulator for 4 Km radius from NCTPS.2 in

400kV SVCM & Alamathy feeders were completed.

2. Further, Procurement under progress for replacement of 230kV and 110 kV porcelain

insulators with Polymer insulator in coastel area.Time line . June 2019.


Time Line requested upto June 2019


Replacement of porcelain insulators with Polymer insulator for 4 Km radius ( in Chennai area)

from NCTPS.2 in 400kV SVCM & Alamathy feeders were completed.

Pending

[with TANTRANSCO]

Status received vide TANTRANSCO mail dated 15-06-2017 & 04.08.2017 & 18.09.2017 & 12-12-

2017:

1. All the Porcelain insulators of 400kV NCTPS-II - Vallur feeders-1&2 were replaced with

Polymer insulators by 20.05.2017. -----Completed

2. Existing Porcelain insulators of all other 400kV feeders are being replaced with Polymer

insulators in a phased manner.

--- Pending

PGCIL (SR-II) Mail dated 11-12-2017:

Pertaining to POWERGRID all the porceleing insulators in the polluted streches has been

completed. - Completed.


TANTRANSCO informed that a total of 597 insulators ahd alreeady been replaced, and the total

replacement would take another 9-month period.

In this regard, TANTRANSCO was asked to furnish detailed plan of action regarding replacement

of insulators on all 400 kV lines owned by them in Chennai area.







TANTRANSCO and PGCIL (SR-II) to take steps to complete

insulator replacement works on the 400 kV lines owned by

them in Chennai area within 3 months.

TANTRANSCO/

PGCIL(SR-II)

Annexure-II

Page 5 of 36

NTPC mail dated 07.12.2017:

1. High set DEFR on 220 KV lines is disabled ----Completed

2. ---- Pending


TSTRANSCO informed that the works are under progress, and are targeted to be completed in 3

months time.

TSTRANSCO MAIL DATED 20.01.2018:

Line Differential Protection will be provided within 3 months i.e., by end of March, 2018.


Line Differential Protection relays are under procurement and will be provided by end of May,

2018.


Line Differential relays will be supplied to site by manufacturer by end of May, 2018 and

erection will be completed by end of June, 2018.


Inspection of the relays is completed and the relays are received at stores. Relays are to be

drawn and commissioned. Work is expected to be completed by end of December 2018.


Relays will be commissioned by end of February, 2019.

66/ II/ 10 Tripping of 400/ 220 kV ICT’s – 3

& 4 at Ramagundam STPS

NTPC-Ramagundam/

TSTRANSCO

PendingTriggering incident was failure of 220 kV

B-phase LA in ICT-3 LV extension feeder (220KV line-2) at

Malayalapalli substation

1. NTPC to disable high-set of DEFR on the 220 kV lines

emanating from their Ramagundam STPS.

2. NTPC/ TSTRANSCO to provide Line Differential Protection

(with or without pilot) on 220 kV Ramagundam –

Malayalapalli lines – 1 & 2 & 3.

11-06-2017

at 19:46hrs

Annexure-II

Page 6 of 36

69/I/2 Complete outage of 400kV TPCIL

station

30-10-2017 at 21:37

hrs

400kV TPCIL - Nellore line-1 got tripped at TPCIL end during

failure of LA of Station Transformer-2 at TPCIL. Running Units

at TPCIL got tripped due to loss of evacuating line. 400kV

TPCIL - Nellore PS line-2 was under emergency shutdown

1. TPCIL to configure DEF protection such that it remains in

blocked condition as long as Distance Protection is active,

and becomes active only when distance protection does not

pickup.

2.PGCIL (SR-I) to ensure healthiness of Carrier

communication, and the set PUP mode of carrier aided

scheme operates reliably on TPCIL lines 1 & 2.

TPCIL/

PGCIL (SR-I)


PGCIL (SR-I) informed that they are waiting for written confirmation from TPCIL to complete



TPCIL by Dec, 2017, they would be able to complete the work by February, 2018.


by April, 2018.





2. PGCI(SR1) procuring LDP relays for retrofitting of Main-1&2 distance relays. Tenders are

invited from bidders & tender floated. Technical bid opening in this week.


2. PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be completed by

Jan'2019 and commissioning by Mar'19.

Review Meeting on 20.12.2018:

1. It was noted that TPCIL representatives have not attended the meting. TPCIL wasked to

furnish implementation status of the given recommendation at the earliest.

Pending

APTRANSCO maild ated 30.01.2018:

1. Pending...

2.A/R scheme on 400kV Kurnool (PGCIL) feeder-2 will be checked after getting LC.

APTRANSCO maild ated 24.04.2018 & 24.05.2018 & 26.06.2018:

1. Pending...

2. B Ph auxilary trip relay is found defective. The same is to be replaced by M/S PGCIL. Ii) PD

relay event is configured in the EL as per the recommendation.


1. ---Pending

2. PGCIl(SR-1): B-Ph auxiliary relay problem rectified at Narnoor end by replacing relay contact. -

--Completed


Lines and Bays pertain to PGCILAPTRANSCO Mail Dated 18.12.2018:

1) Bays and lines pertains to PGCIL .

2) ---Completed.


1) PO placed on M/s GE & TD India Ltd on 24.09.2018. Supply of relays will be completed by

Jan'2019.


Pending [with PGCIL (SR-I)]

APTRANSCO maild ated 15.12.2017:

APTRANSCO would extend support and requirements if any ,for the rectification proposed by

KPTCL.


It was noted that the original Gooty - Lingapur line got LILOed at BTPS, Alipura, and

Ragulapadu. It was also noted that Phase Discrepancy is being observed in Ragulapadu - Alipira

section only. When enquired about the same, KPTCL informed that they would examine the

issue in detail, and would inform the action lan proposed by next PCSC-71 meeting. On this,

APTRANSCO was also asked to render all help required from their side to KPTCL.

APTRANSCO maild dated 30.01.2018:

APTransco world extend required support .

APTRANSCO maild dated 24.04.2018 & 24.05.2018 & 26.06.2018:

AP Transco would extend required support for attending, phase discrepancy issue in ragulapadu-

Alipura line by KPTCL.


To be attended by KPTCL as discussed in 75th PCSC meeting.


Phase mis match issue is to be sorted out jointly by KPTCL/ APTRANSCO/ KPCL.


PCSC forum decided that concrete action in this respect to be initiated in 2 months by KPTCL

alongwith APTRANSCO.


Pending [with KPTCL ]

APTRANSCO/

PGCIL (SR-I)

Tripping of 400 kV Kurnool(PG) –

Kurnool(AP) line-2

02-10-2017 at 02:03

hrs

1) PGCIL (SR-I) and APTRANSCO to provide for Line

Differential Protection as both the Main protections on 400

kV Kurnool (AP) – Kurnool (PG) lines 1 & 2 lines.

2) APTRANSCO to furnish an action taken report w.r.t.

resolving A/R non-operation at Kurnool-AP end for the

subject trippings and configure EL for capturing PDR

operation at their 400 kV Kurnool-AP SS.

Line tripped on B-ph to ground fault. A/R was unsuccessful at

both Kurnool (AP) and Kurnool (PG) ends.

Line tripped on B-Ph to earth fault. A/R was successful at

Regulapadu and breakers at Alipura end got tripped.

KPTCL and APTRANSCO to sort out issues relating to

incongruence in denoting R, Y, B phases of the electric supply

on their respective sides.

APTRANSCO/ KPTCL Pending

[with KPTCL ]

Pending [with PGCIL

(SR-I)]

69/III/3

69/III/7 Tripping of 220 kV Ragulapadu –

Alipura line

12-10-2017 at 01:30

hrs

Annexure-II

Page 7 of 36

76/II/9 Tripping of 230 kV Thiruvalam -

Chittoor line

13-06-2018 at

18:55hrs

Y-phase to earth fault occurred in line. At 230 kV Tiruvalam

end, breaker was under lockout leading to operation of LBB

protection.

1) TANTRANSCO to provide double-bus operation at their

230 kV Thiruvalam SS.

2) APTRANSCO to replace the existing static relays with

suitable numerical relays for various line protections at their

220 kV Chittoor SS.

TANTRANSCO/ APTRANSCO 1) TANTRANSCO Mail dated 29.08.2018 & 11.09.2018:

Material supplied and work to be taken up ---Pending

2) APTRANSCO Mail dated 24.09.2018:

The static relays were replaced with Numerical relay on all 220 kV feeders at 220 kV SS chittoor.-

--Completed

TANTRANSCO Mail dated 11.12.2018:

Due to space constraint, the equipments could not be erected.


In view of Tiruvalam being inter-state sustation, TANTRANSCO was asked to prvodie double-bus

operation at their 230 kV Tiruvalam SS.


Pending [with TANTRANSCO]

TANTRANSCO MAIL DATED 23.01.2019 & 19.03.2019:

Feasibility for providing hybrid breaker / shifting of bays will be studied & action will be taken.

Time upto Sep 2019

Pending [with

TANTRANSCO]


3). Nagzari-Bidnal PLCC link is healthy --- Completed.

1.--- Pending

2. --- Pending


1. & 3. Completed

2. Pending

KPCL mail dated 24-12-2018:

1) --- Completed

2) Proposal will be taken up for replacement of existing PZ1000 relays with new version

Numerical Line protection relays having IEC61850 shortly, after availing necessary admnistrative

approval...Pending

3) Completed

KPCL mail dated 23.01.2019:

1. Completed

2. Letter addressed to site to take up the proposal for replacement of PZ1000 line distance

relays.

3. Completed


1). COMPLETED


Numerical Line protection relays having IEC61850. Prepration of specification is under progress.

3) COMPLETED

78/II/3 Multiple trippings at 400 kV

Julurupadu

01-08-2018

at 19:33 hrs

400kV Julurupadu-KTPSVII line-1 tripped at at Julurupadu end

on SOTF due to 3-phase to ground fault while charging the

line. 400kV Julurupadu-KTPSVII line-2 tripped at KTPSVII end

due to Over Current protection and 400kV Julurupadu-

Suryapet-2 feeder tripped at Suryapet end on STUB(I>4)

indications.

1) TSGENCO to ensure that the mandate operations

procedures are duly followed by their station personnel at

KTPS end whenever any LC is taken or returned.

2) TSGENCO to ensure the following on all 400 kV lines

emanating from their KTPS-VII station:

• O/C protection is kept disabled.

• High-set operation of line’s DEF protection is kept disabled;

IDMT settings of DEF protection are suitably kept.

3)TSTRANSCO to resolve issues w.r.t. Stub protection

operation at Suryapet end relays for the 400 kV Suryapet -

Julurupadu line-2, and intimate the corrective action taken to

PCSC forum.

TSGENCO/ TSTRANSCO TSTRANSCO mail dated 14-11-2018:

1) Pending.

2) Pending.

3) The stub operation in P444 relay at Suryapet end is due to logic problem and is rectified on

28-10-2018.---Completed.

TSTRANSCO mail dated 27-11-2018:

1) TSGENCO ( AT KTPS - VII stage ) Strictly adhering the operations procedures and following

the standard procedures while taking and returning LC . -

Completed

2) TSGENCO ( at KTPS - VII Stage ) is adopted the settings from TSTRANSCO for the 400 kv

feederes. The settings will be modified accordingly in coordination with TSTRANSCO. --

Pending

3) Completed


2. TSGENCO informed that the modification of settings will be completed in 1 month.

-----Pending

Pending

78/II/16 Multiple trippings at 220kV

Nagjheri PH

31-08-2018

at 11:49 hrs

Triggering incident was B-E fault in 220 kV Nagjheri -

Ambewadi line-1. As per the information received, after

tripping of 220 kV Naghjeri - Ambewadi line-1, 220 kV

Naghjeri Ambewadi line#2 got overloaded. This resulted in

the tripping of Nagjheri Generating Units #3 and 6 on SPS

operation. At the same time, Unit #2 got tripped on REF

operation.

1)KPTCL to examine the reasons for tripping of more than

one Unit (Units – 3 & 6) on SPS operation at Nagjheri PH

during subject trippings, and furnish a report on the same

along with remedial action taken to PCSC forum.

2)KPCL to employ a suitable time delay of 50 – 60 msec in

operation of REF protection for the GT of Unit-2 at their

Nagjheri PH.

KPTCL/ KPCL Review Meeting on 20.12.2018:

1. KPTCL I formed that SPS scheme finalisation shall be completed in one month time ---

Pending

KPCL mail dated 24-12-2018:

2) Time delay of operation is not changed. However, the external NCT is used for REF

protection against earlier internal NCT for REF, to avoid tripping due to malopration ---

Completed.


1) It shall be reviewd and Implemented by KPCL in coordination with KPTCL.

2)....Completed.


1) It shall be reviewd and Implemented by KPTCL in coordination with KPCL.

Pending

78/I/2 Complete outage of 220 kV

Nagjheri PH and 220/110 kV

Ambewadi Substation.

17-09-2018 at

14:37hrs

220kV lines connected to Nagjheri PH got tripped due to

successive transient faults. Running Units #3 and #4 at

Nagjheri got tripped on over frequency protection operation

due to loss of evacuating lines resulting in complete outage

of 220 kV Nagjheri. 220 kV Nagjheri being the only source to

220kV Ambewadi station, since 220kV Ambewadi Narendra

line 1&2 were under shutdown during antecedent condition,

tripping of Units at 220 kV Nagjheri resulted in the loss of

supply to 220 kV Ambewadi SS.

1. SLDC/KPTCL to be pro-active in issuing necessary

directions that help in expeditious restoration of the tripped

lines based on the prevailing conditions and grid security.

2.KPCL to implement A/R enabled on all 220 kV lines

emanating from their 220 kV Nagjheri PH, with the help of

KPTCL, by December, 2018. In the event of non-amenability

of the existing PZ1000 relays in providing A/R feature, KPCL

shall take steps to retrofit them with suitable relays that

support A/R.

3. KPTCL to restore PLCC carrier communication on 220 kV

Nagjheri – Bidnal line at the earliest

KPCL/ KPTCL Pending

Annexure-II

Page 8 of 36

TANTRANSCO Mail dated 11.12.2018:

1. TANTRANSCO: Estimate sanctioned for replacement of defective isolator status feedback.

Work under progress. ......Pending

2.Earth value of 110kV earthmat has been improved & 230kV side earthmat work under

progress. Lightning mask earthing renovation under execution............Pending

3.......Pending


Relays settings reviewed and need to be revised due to change of line length DR & EL's of Main-

1 (P444) relay configured properly. Main-2 (D60) relay to be configured.


1 & 2). TANTRANSCO informed that Work will be completed by March 2019.

3. APTRANSCO informed that work will be completed by February 2019.


Collecting the details of adjacent feeders connected to Gummadipudi for computing revised

relay settings.


Isolator status will be ensured by March 2019


3. Revised relay settings were implemented on 16/02/2019 ---Completed


New 230kV isolators have been allotted for replacement of defective isolators. Hence time line

requested upto June.2019

81/IV/3 Tripping of 400 kV Warangal -

Bhoopalapalli line-2

15-12-2018 at 20:42

hrs

Line tripped at Bhoopalapalli end only and was holding from

warangal s/s. FIR, DR and EL of Bhoopalapally were not

furnished.

For the line under consideration, the following shall be

carried out by TSGENCO in coordination with PGCIL (SR-I):

(i) End-to-end communication for DT/ permissive & other

signals may be ensured by testing at both the ends.

(ii) Healthiness of PLCC system components (hardware and

software) at both ends shall be checked and faulty

components shall be repaired/ replaced.

TSGENCO/ PGCIL (SR-I) Yet to be informed Pending

TANTRANSCO/ APTRANSCO1) TANTRANSCO to take steps to implement multi-bus, multi-

zone operation (Double-bus operation) at their 230 kV

Gummidipooindi SS by December, 22018.

2) TANTRANSCO to check if the Gummidipoondi substation is

adequately protected from lightning-strokes by providing

requisite no. of lightning masts and/ or earth-wire caging.

3) APTRANSCO was asked to verify & correct the settings

employed for distance protection at Sullurpeta and configure

DR’s & EL’s of all Protection Relays at their Supllurpet SS

properly for recording only the mandated protections &

digital signals.

Triggering incident was B-phase fault at 230kV

Gummidipoondi Substation due to which 230kV Bus-1 Bus-

bar protection operated. 230kV Gummidipoondi Station was

under single bus operation, hence operation of Bus-bar

protection resulted in tripping of all connected elements.

05-10-2018 at 00:42

hrs

Complete outage of 230/ 110 kV

Gummidipoondi Substation

Andhra Pradesh

Pending [with

TANTRANSCO]

79/I/2

Annexure-II

Page 9 of 36

57/II/9 Tripping of 400 kV Nellore (PG) -

NPS line-1, 400 kV

Krishnapatnam-Nellore (AP)

lines -1&2 and 400kV NPS -

MEPL line

18-07-2016

at 19:05 hrs

Triggering incident was snapping of Y phase conductor in

400kV Nellore (PG) - NPS line-1. Distance relay at

Krishnapatnam end over-reached in Zone-1, and resulted in

tripping of 400kV Krishnapatnam – Nellore (AP) lines - 1&2

from Krishnapatnam end. Distance relay at MEPL over-

reached and resulted in tripping of MEPL-NPS line from MEPL

end.

APGENCO to furnish a report on the remedial action

implemented w.r.t. overreaching of Krishnapatnam end

distance relays during the tripping of 400 kV Nellore (PG) -

NPS line-1

APGENCO Review Meeting dated 19.12.2017:

It was noted that no APGENCO representative had come to attend the meeting.

APGENCO Mail dated 19.12.2017:

Procurement of relays is under progress


APGENCO representatives had not come to attend the meeting.

Pending

74/II/21 Tripping of 400 KV Kalikiri –

RYTPP line-2

29-04-2018 at 19:29

hrs

Line tripped on operation of over-voltage protection at

RYTPP and Direct Trip receipt at Kalikiri. The correct

operation of over-voltage tripping could not be validated as

FIR, DR and EL of RYTPP and DR and EL of Kalikiri were not

furnished.

1). APGENCO to furnish detailed report on the reasons for

the tripping of the line including remedial measures taken.

2). APGENCO to ensure that the OVR-settings implemented

at Rayalaseema TPP are as per the SRPC provided settings

issued vide letter dated 01.05.2018, and confirm the same.

APGENCO Status received vide mail dated 25.09.2018:

2). OVR settinss incorporated as per the Lr.No. CE/IPC&PS/SP/13/

400KV -OVR -SRPC/VOL.OI/ D.No,2001333/ 18: Dt: 04.05.18 --- Completed


1). It was noted that no APGENCO representative had come to attend the meeting --- Pending

Pending


Kalikiri and 400 kV RyTPP, Stage-

V station

16:08 hrs on

11-05-2018

Triggering incident was R-E fault in 400kV RyTPP- Kalikiri Ckt-

1. Auto reclose (A/ R) was successful at Kalikiri end but didn’t

operate at RyTPP end. This led to tripping of running unit at

RyTPP due to tripping of evacuating line and complete

outage of RYTPP. At the same time 400kV Chittoor-Kalikiri

lines - 1&2 got tripped from Chittoor end on operation of Z3

(mal-operation) resulting in loss of supply to Kalikiri station.

APGENCO to ensure that A/R functionality implemented on

400 kV RyTPP (Stage-V) – Kalikiri lines – 1 & 2 at RyTPP (Stage-

V) end is healthy and in kept service.

APGENCO Status received vide mail dated 25.09.2018:

RTPP,(9taqe-lU end,iis healthy and kept in service. Hence it is requested to drop all the ahove

points.


It was noted that no APGENCO representative had come to attend the meeting

--- Pending

Pending

79/III/8 Tripping of 400 kV RYTPP-Kalikiri

line-2

26-09-2018 at 21:13

hrs

Line tripped on B-N fault. Auto-reclose was successful at

Kalikiri and three phase trip at RYTPP due to A/R lock-out.

APGENCO to furnish a detailed report on tripping event

bringing out reasons for A/R non-operation at yTPP end on

400 kV RyTPP – Kalikiri line along with remedial action taken

to PCSC forum.

APGENCO Review Meeting dated 20.12.2018:

It was noted that no APGENCO representative had come to attend the meeting.

Pending

82/III/8 Tripping of 400kV VTPS-

SURYAPET-1

10-02-2019

at 13:20 hrs

B-phase to earth fault occurred in line. Auto-reclose was

successful at Suryapet and breakers got tripped at VTPS end

It was noted that no representative of APGENCO attended

PCSC-82 meeting. APGENCO to furnish a detailed report on

tripping event bringing out reasons for A/R non-operation at

VTPS end along with remedial action taken to PCSC forum.

APGENCO Yet to be informed Pending

82/III/9 Tripping of 400kV VTPS-

SURYAPET-1

15-02-2019

at 14:36 hrs

B-phase to earth fault occurred in line. Auto-reclose was

successful at Suryapet and breakers got tripped at VTPS end

It was noted that no representative of APGENCO attended

PCSC-82 meeting. APGENCO to furnish a detailed report on

tripping event bringing out reasons for A/R non-operation at

VTPS end along with remedial action taken to PCSC forum.

APGENCO Yet to be informed Pending

80/II/18 Tripping of 400 kV Uravakonda -

Veltoor line-2

19-11-2018 at 12:00

Hrs

As per FIR, 400 kV Uravakonda - Veltoor Line-2 tripped on

operation of overvoltage Stage-1 at Uravakonda end and DT

received at veltoor end. From the DR furnished, voltages at

Uravakonda end are: Vr- 243kV, Vy-245kV and Vb-242kV.

From the DR operation of Overvoltage Stage-1 protection

could not be established. Over voltage grading of the line at

Uravakonda end is 109%, 6secs, tripping is not as per grading.

APTRANSCO to adopt recommended OVR, Stage-I and OVR,

Stage-II protections at their 400 kV Uravakonda SS, and to

ensure that OVR-I_START signal is configured for triggering

corresponding Event Logger (EL), and OVR-I_TRIP is

configured for triggering corresponding Event Logger (EL)

and Disturbance Recorder (DR).

APTRANSCO APTRANSCO MAIL DATED 22.01.2019:

Informed to M/s siemens to configure the OVR signals.


M/s. Siemens configured OVR signals as per settings on 24/01/2019.

Pending

82/II/5 Tripping of 400 KV Mahbubnagar

– Uravakonda line - 2

22-01-2019

at 18:53hrs

OV St-1 at Uravakonda end and DT was received at

Mahaboobnagar end. From DR, voltages observed are: Vr-

244kV, Vy-247kV and Vb-257kV. B-ph voltage is found to be

higher than R and Y phases.

APTRANSCO to furnish details regarding the reasons for OVR

tripping and also to sort out time sync issues in coordination

with TSTRANSCO.

APTRANSCO Yet to be informed Pending

Annexure-II

Page 10 of 36

07-11-2017 at 23:02

hrs

09-11-2017 at 21:57

hrs

12-11-2017 at 20:54

hrs

17-11-2017 at 21:19

hrs

11-11-2017 at 22:02

hrs

12-11-2017 at 23:09

hrs

24-11-2017 at 18:46

hrs

11-12-2017 at 18:49

hrs

18-12-2017 at 19:10

hrs

74/II/2 Tripping of 400 kV Kurnool-

Srisailam line

01-04-2018 at 18:03

hrs

Line tripped on operation of Over Voltage Stg-1 protection at

Srisailam and Direct Trip was received at Kurnool.

Considerable difference between Phase voltages was

observed in Srisailam end DR. (Vr-257kV, Vy-246kV, Vb-

239kV)

1). TSGENCO was asked to double—check the faulty CVT’s

and replace them at the earliest.

2). TSGENCO was also asked to implement new OVR gradings

issued vide SRPC letter dated 01.05.2018.

TSGENCO TSGENCO mail dated 31.07.2018:

1. TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt

of new CVT’s faulty CVT’s will be replaced with new CVT’s. Replacement of faulty CVT's will be

completed by the end of September 2018.

--- Pending

2.TSGENCO: TSGENCO was implemented new OVR gradings issued by SRPC

--- Completed.


1. TSGENCO informed that CVT replacemen will be completed by January 2019

TSGENCO mail dated 26.03.2019:

LC was approved for SLM- KNL feeder from 15 th April'19 to 24 th April"19. During the above LC

period replacement of faulty CVT's will be completed.

Pending

82/I/6 Complete Outage of 220kV

N’Sagar Main Power House of

TSGENCO

17-02-2019 at

23:32 hrs

During change over to Pump Condenser mode, bus fault

occurred at 220kV N’Sagar Main Power House. Due to non-

operation of BBP (Bus Bar Protection), fault was cleared by

tripping of 220kV connected feeders on Zone 2 Distance

Protection operation.

1) TSGENCO is recommended to take proper steps to ensure

correct feedback of all physical and electrical parameters are

obtained in SCADA, in case of any discrepancy in SCADA

feedback, operator must ascertain the correct feedback and

then only proceed with any further actions.

2) Operating personnels should regularly visit the field and

report if any drastic changes in parameters.

TSGENCO Yet to be informed Pending

TSGENCO to adopt stipulated OVR, Stage-I gradings for the

400 kV lines emanating from their 400 kV Srisailam LB RH,

and furnish an action taken report w.r.t. mitigating observed

voltage difference among R & Y & B phases.

PendingTripping of 400 kV Satenapalli-

Srisailam line-1


Srisailam and Direct Trip was received at Sattenapalli.

Considerable voltage difference was observed between R, Y

& B phases at Srisailam end.

71/II/7


TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt



TSGENCO: TSGENCO was adopted new OVR stage-1 gradings on all feeders issued by SRPC.


TSGENCO informed that CVT replacement would be completed by January 2019.




TSGENCO to adopt stipulated OVR, Stage-I gradings for the

400 kV lines emanating from their 400 kV Srisailam LB RH,

and furnish an action taken report w.r.t. mitigating observed

voltage difference among R & Y & B phases

Line tripped on operation of Over-Voltage protection at

Srisailam and Direct Trip was received at Kurnool.

Considerable voltage difference was observed between R, Y

& B phases.

70/II/2


1.TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt



---Pending

2.TSGENCO: TSGENCO was adopted new OVR stage-1 gradings on all feeders issued by SRPC. ---

Complied


1. TSGENCO informed that CVT replacemen would be completed by January 2019

------- Pending




Tripping of 400 kV Narnoor –

Srisailam LB line

Line tripped due to operation of over voltage protection at

Srisailam LB end. Considerable phase difference was

observed between phases at Srisailam end

Pending

Pending

1. TSGENCO to take steps to replace the existing faulty CVT’s

at Srisalam end on 400 kV Srisailam – Narnoor line at the

earliest.

2. TSGENCO to adopt stipulated OVR, Stage-I gradings on all

400 kV transmission lines emanating from Srisaliam LB.

TSGENCO


TSGENCO: Purchase order was placed on 08.03.2018 for procurement of CVT’s & after receipt



TSGENCO: TSGENCO was adopted new OVR stage-1 gradings on all feeders issued by SRPC.


TSGENCO informed that CVT replacemen would be completed by January 2019


LC was applied in Advance pre-arranged shutdown programme for SLM - STPL-1 Feeder in the

month of May-2019. Replacement of faulty CVT's will be completed by May-2019.

Tripping of 400kV Kurnool-

Srisailam line

70/II/3

Telangana

Annexure-II

Page 11 of 36

82/II/1 Tripping of 400kV KTPS VI- KTPS

VII

05-01-2019

at 10:17hrs

Line tripped at KTPS VI end due to suspected mal-operation

of over-voltage protection. Line was in service from KTPS VII.,

BUS CVT secondary R PHASE got grounded at KTPS VI

1) TSGENCO to configure OVR_start and OVR_tripin EL at

KTPS-VI end and sent a report after completion of works

related to DT communication channel between KTPS-VI and

KTPS-VII

TSGENCO Yet to be informed Pending

Annexure-II

Page 12 of 36

74/II/8 Tripping of 400/220 kV ICT-2 at

Gajwel

11-04-2018 at 5:50

hrs

400/220 kV ICT-2 at Gajwel tripped on mal-operation of

Buchholtz relay.

1). TSTRANSCO was asked to keep the ICT and its mechanical

protections under observation for detecting any slippages.

2). TSTRANSCO was also asked to configure capturing of

mechanical protections of ICT’s in the respective relay’s/

station’s event logger.

TSTRANSCO TSTRANSCO mail dated 20.06.2018:

1. Mechanical protections of ICTs is under observation. --- Completed

2.New relays are available at site and will be commissioned by 2nd week of August-2018. The

mechanical protection of ICTs will be configured in the new relays ----Pending


2. New relays will be commissioned by end of November-2018 and the Over Voltage settings

will be implemented after commissioning in new relays ----Pending


2. New relays will be commissioned by end of January-2019 and the mechanical protections of

ICTs will be configured in the new relays ----Pending



Pending

TSGENCO mail dated 26.03.2019

Testing & commissioning of Line Differential Protection (LDP)relays were completed for both

Main-1 & 2 relays for Jurala PH- Jurala SS Feeder-1. For Jurala PH- Jurala SS Feeder-2

retrofitting testing & commissioning of LDP relays for both Main-1 (RED 670) and Main-2

(MICPM P546) were completed except communication establishment between both ends for

Jurala SS Feeder-2 MICOM P546 relay.

The issue was discussed in PCSC-58 meeting held on 18.10.2016, when PCSC forum agreed to

de-link the implementation of the Item from the scope of Protection Audit Recommendations

(PAR), and pursue it as part of PCSC Recommendations.

TSGENCO mail dated 30-05-2017

Procurement of Differential Protection relays is under process and the work will be completed

by the end of November 2017.

TSGENCO mail dated 18-09-2017

Procurement of Line Differential Protection Relays is under process and the work will be

completed by the end of January 2018.


TSGENCO informed that they are in constant touch with TSTRANSCO in this regard, and hope to

implement LDP by February, 2018.

TSTRANSCO informed that procurement of LDP relays is under progress, and assured that LDP

would be implemented in 3-months time.

TSTRANSCO MAIL DATED ON 20-01-2018:

The matter is being coordinated with TSGENCO.

TSTRANSCO MAIL DATED ON 05-03-2018:

As a part of implementation of line differential relays for short distance (Jurala PH to Jurala SS)

feeders, procurement of Line Differential Protection Relays are in process and the work will be

completed by the end of June 2018.


TSGENCO: Purchase Order was placed on 05.06.2018 for Procurement of Line Differential

Protection (LDP) relays and the work will be completed by the end of October 2018


Inspection of the relays is completed and the relays are received at stores. Relays are to be

drawn and commissioned. Work is expected to be completed by end of December 2018.



PendingPAR/

PCSC-58

Provision of line differential protection for Jurala line 1 & 2 (line length-1.45 KM) feeders at 220 kV Jurala HPS

[Carry-Over from Protection Audit Recommendations]

TSGENCO/ TSTRANSCO

Annexure-II

Page 13 of 36

Mail received on 21-10-2015:

1) Anti-pumping contactors of all the nine 220KV Lines are in circuit and tested periodically

during AOH works of lines along with other protections.

2) Completed.

3) Possibility to use both the 220kV buses as main bus under normal operation is under review.

Mail recieved on 23-11-2015:

1) Completed

3) Two bus operation for 220kV buses : In place of existing CT switching relays, High speed

manual heavy duty change over switch of sufficient current capacity will be retrofitted to all

feeders at 220kV station and same will be operated manually during changeover of feeder by

one bus to the other and this arrangement may facilitate to put both buses in service. Time

required for this retrofit is around 90days . However, this work will be taken up only after

retrofitting of electromagnetic relays with numerical relays for Main-2 protection of all 220kV

lines, for which work is in progress.

Status received vide mail dated 10-07-2017:

1) --- Completed.

2) --- Completed. Status received vide KPCL mail dated 14.12.2017:

3) DPR for implementation of Two Bus operation for 220kV bus system has been prepared and

proposal is placed for funds from PSDF. After the approval of the DPR, the work is proposed to

be taken up.


3) KPCL informed that DPR for implementation of Two Bus operation for 220kV bus system has

been prepared and proposal is placed for funds from PSDF. After the approval of the DPR, the

work is proposed to be taken up. Time frame requested for is 2 yrs.


3) Work proposed to be taken up under PSDF. Approval from Nodal agency is awaited.

However, arrangements have been made to issue NIT.


KPCL informed that Tender would be floated in 1 month and work would be completed in 2

years.


Tender would be floated in 1 month and work would be completed in 2 years.


Arrangements have been made to issue NIT and Tender for the work proposed to be floated

during May- 2019.

Status received vide KPCL mail dated 10.07.2017:

1. (ii) Hot line water washing stopped and off line water washing is carried out whenever the

400 KV Unit or line is under tripped condition / Shutdown condition. --- Completed

1. (iii) Silicon coating for Unit#8 main & tie breakers carried out in Sep'16 and same is under

observation. Till today in order and good condition. For remaining breakers, since it is big order,

approval for the same is under process. --- Pending

2. Static / Electromechanical relays are existing in all 1 to 7 units. Breaker flash over protection

feature will be enabled (if available) in the numerical relays which will be retrofitted in phased

manner during R&M works.


1.(i) --- Pending

1. (ii) Hot line water washing stopped and off line water washing is carried out whenever the

400 KV Unit or line is under tripped condition / Shutdown condition. --- Completed

1. (iii) Silicon coating for Unit#8 main & tie breakers carried out in Sep'16 and same is under

observation. Till today in order and good condition. For remaining breakers, since it is big order,

approval for the same is under process --- Pending

2. Static / Electromechanical relays are existing in all 1 to 7 units. Breaker flash over protection

feature will be enabled (if available) in the numerical relays which will be retrofitted in phased

manner during R&M works --- Pending

46/II/21 Trippings at 220kV Raichur TPS 07-06-2015 at 01:35

hrs

1. KPCL to check the operation of anti-pumping relay on 220

kV side and keep it in healthy condition.

2. KPCL to provide manual reset to the 220 kV side master

trip relay.

3. KPCL to use both the 220 kV buses as main buses under

normal operation, and should go for single bus operation

only during emergencies.

KPCL Pending

Y-ph Pole of Tie-breaker of Unit-4 at RTPS failed. Unit-4 got

tripped on operation of Generator Differential, Reverse

power & LBB protection. Operation of LBB protection led to

tripping of BUS-2 at RTPS

1.KPCL to undertake the following remedial measures to

avoid breaker flashovers:

(i) Replacing all porcelain insulators with composite

insulators

(ii) Carrying out hot-line water washing of all insulators on

regular basis.

(iii) Applying Room Temperature Vulcanizing (RTV) Silicone

high voltage insulator coatings to all bus-connected ceramic

insulators of equipment like CT, PT, CB, Isolators etc.

2.KPCL to take steps to provide dedicated breaker flashover

protection to all breakers at Raichur TPS at the earliest.

KPCL Pending54/II/9 Tripping of 400kV Raichur TPS

Bus-2

13-04-2016 at 21:12

hrs

Karnataka

Annexure-II

Page 14 of 36


1 (iii) As upgradation of 400kV switchyard equip's to be taken under PSDF funds, Silicon rubber

coating for breakers is deffered till then. --- Pending

2. Replacement by Num relay for Units - 5,6 & 7 completed in the month of Oct-2017. Main-I is

Seimens make and Main-II is ABB make. --- Pending


2. Replacement of Numerical relays for Units-5, 6 & 7 have been completed. Referred to OEM

for providing the Breaker flashover protection for all the breakers.


2. Reply is awaited from OEM of Numerical relays for providing Breaker Flashover protection

for all the breakers --- Pending


1. KPCL assured that porcelain insulator replacement will be taken care in tender floated for

RTPS Busbar modification --- Pending


1) i) Being discussed with other utilitis.

2) Reply is awaiting from OEM to implement the Breaker flash over protection in the Numerical

relays referring to the protection implemented in other 400KV station.


1) (i) & (iii)- Arrangements have been made to issue NIT and Tender for the work proposed to

be floated during May- 2019.

2) Reply is awaiting from OEM to implement the Breaker flash over protection in the Numerical

relays in 400KV station. & Being discussed with other utilities.

It is requested to furnish Necessary logic and settings to implement the breaker flashover

protection

Y-ph Pole of Tie-breaker of Unit-4 at RTPS failed. Unit-4 got

tripped on operation of Generator Differential, Reverse

power & LBB protection. Operation of LBB protection led to

tripping of BUS-2 at RTPS

1.KPCL to undertake the following remedial measures to

avoid breaker flashovers:

(i) Replacing all porcelain insulators with composite

insulators

(ii) Carrying out hot-line water washing of all insulators on

regular basis.

(iii) Applying Room Temperature Vulcanizing (RTV) Silicone

high voltage insulator coatings to all bus-connected ceramic

insulators of equipment like CT, PT, CB, Isolators etc.

2.KPCL to take steps to provide dedicated breaker flashover

protection to all breakers at Raichur TPS at the earliest.

KPCL Pending54/II/9 Tripping of 400kV Raichur TPS

Bus-2

13-04-2016 at 21:12

hrs

Annexure-II

Page 15 of 36

54/II/13 Tripping of Units at 220 kV

Raichur TPS

15-04-2016 at 15:36

hrs

During testing of retrofitted distance protection in 400kV

Raichur-2 feeder, LBB protection trip DC got extended to Bus

trip. This resulted in tripping of 220kV bus at RTPS and all

connected 220 kV elements. Unit-4 which is connected to

400 kV Bus got tripped due to tripping of Station Utility

Transformer that is connected 220 kV bus

In view of the availability of two buses along with healthy

bus-coupler at 220 kV RTPS, KPCL is recommended to put in

service the double-bus operation at 220 kV RTPS by suitably

distributing loads within 15 days.

KPCL Status received vide KPCL mail dated 10.07.2017 & 14.12.2017:

Two Bus operation for 220kV bus is being carried out whenever required. However scheme for

tripping of one bus during LBB/fault and maintaining the other bus intact by tripping B/C

breaker will be taken up in R&M works.


3) KPCL informed that DPR for implementation of Two Bus operation for 220kV bus system has

been prepared and proposal is placed for funds from PSDF. After the approval of the DPR, the

work is proposed to be taken up. Time frame requested is 2 yrs.

KPCL mail dated 20.12.2018 & 23.01.2019:

Work proposed to be taken up under PSDF. Approval from Nodal agency is awaited. However,

arrangements have been made to issue NIT.

Pending

Annexure-II

Page 16 of 36


1. All logics checked and found normal. LBB timing checked and found 200msec as per KPTCL

MRT recommendation. - Completed

2. Work Under Progress ---- Pending

3. New GPS System commissioned along with new numerical and synchronised with GPS system

- Complied

4. Work Under Progress ---- Pending

Status received vide mail dated 14.12.2017:

1),3),4) Completed

2. Auto Start of DG set is taken up --- Pending


2. KPCL informed that for AMF of DG, Scheme prepared & material procurement under process.

The AMF scheme will be implemented in January 2018. --- Pending

3. The GPS system commissioned on Nov 2016 & all the numarical relay time synchronised with

GPS ---- Completed


AMF panel procurement under progress.

KPCL mail dated 20.1.2.2018:

2. AMF scheme implementation is included in the work ''Replacement common auxiliary panel

with latest technology SCADA compatibility system'' . Availing administration approval is under

progress


KPCL informed that Tender for the work would be floated by January 2019 and work would be

completed in 1 year.


1) Completed.

2) Tender for the work would be floated by February 2019 and work would be completed in 1

year....Pending

3) Completed.

4) Tender for the work would be floated by Feb, 2019, and work would be completed in 1

year....Pending


2) Tender for the work proposed to be floated during May- 2019 after model code of conduct

and work would be completed in 1 year .

4) Tender for the work proposed to be floated during May- 2019 after model code of conduct

and and work would be completed in 1 year.

69/II/8 Tripping of 220 kV Kaiga- Kadra

line-1

06-10-2017 at 22:22

hrs

While de-synchronising of Unit-2, B-phase pole of GCB did

not open and pole descrepancy relay operated. Hence all

220KV lines CB hand tripped.

KPCL to take steps to replace the existing static protection

relays for Generator Units and Generating Transformers

(GT’s) with suitable Numerical relays at their 220 kV Kadra

PH.

KPCL Status received vide mail dated 25.07.2018:

Numerical Generator protection relay replacement proposed to be taken up alongwith SCADA

work.


Will be taken up along with SCADA work. NIT to be issued on Jan-2019


KPCL informed that Tender for the work would be floated by March, 2019, and work would be

completed in 1 year.


Tender for the work would be floated by February-2019 and work would be completed in 1

year.


Tender for the work proposed to be floated during May- 2019 after model code of conduct and

work would be completed in 1 year

Pending

72/I/4 Complete outage of 220kV

Sedam, Shahapur, Shahabad,

Kapanoor, Humnabad and

Halabarga Stations of KPTCL

01-02-2018

at 17:46 hrs

High resistance fault occurred in 110kV Sedam-Chittapur line

near Sedam end. Line DEF operated and backup OC

protection of 100MVA transformer operated at Sedam end.

But line breaker and transformer HV breaker didn’t open due

to problem in trip circuit. This resulted in cascade tripping of

upstream feeders and power supply was lost to six 220kV

stations of KPTCL.

KPCL to disable GFC protection on all lines emanating from

their generating stations.

KPCL Review Meeting on 21.12.2018

KPCL informed that compliance w.r.t. Implementing the recommendation would be furnished

soon.


'GFC protection will be disabled in all lines in coordination with M/s.KPTCL

Pending


Varahi power station

15-03-2018 at 22:36

hrs

There was Y-phase to ground fault on 220 kV Varahi -

Shimoga line-2. Consequent to persisting fault in ‘Y’ phase,

the breaker failure protection operated resulting in operation

of 220KV bus bar protection at Varahi, tripping all the

connected lines and Varahi running units.

KPCL to take steps to put double-bus operation into service

at their 220 kV Varahi PH.

KPCL Status received vide mail dated 25.07.2018:

Under Implementation.

KPCL mail dated 20.12.2018 & 23.01.2019 & 23.03.2019:

Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service after April-2019

Pending

78/I/1 Complete Outage of 220 kV

Varahi UGPH.

24-08-2018 at 11:00

hrs

Due to suspected mal-operation of 220KV bus bar protection

at Varahi, all the connected lines and Varahi running Units

got tripped. (6 nos 220kV lines and 4 nos Varahi generating

station running Units). This resulted in complete outage of

220kV Varahi UGPH

1. KPCL to take steps to put double-bus operation into

service at their 220 kV Varahi UGPH by December, 2018.

2. KPCL to employ correct operational practices like keeping

DC fuses of B/C CB intact during bus changeover works,

disabling back-up protections of B/C CB during bus

changeover works & enabling them with proper settings only

when it is used as Main-CB of the grid elements.

KPCL KPCL mail dated 20.12.2018 & 23.01.2019:

1. Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service after April-

2019 --- Pending

2. ---- Completed.


1) Retrofitting of 220kV Bus Isolators is under progress. Proposed to be in service after April-

2019

Pending

Complete outage of 220 kV

Kadra power station of KPCL

06-09-2016

at 14:40 hrs

58/I/3

(GD)

PendingKPCL1) KPCL to check settings of LBB protection in all relays from

which it was implemented, and ensure that their

configuration, logic, and timing are in order at their 220 kV

Kadra PH.

2) KPCL to furnish details regarding the existing LT auxiliary

supply arrangement at their 220 kV Kadra PH, and take steps

to provide a suitable Auto-Main-Fail (AMF) panel for DG set

to effect its auto-starting in case of failure of LT supply.

3) KPCL to ensure time-sync of all relays (DR’s & EL’s) with

GPS at their 220 kV Kadra PH.

4) KPCL to provide stand-alone Event Logger at their 220 kV

Nagjheri PH.

LBB of 220kV Kodasalli breaker at Kadra end got operated

which resulted in tripping of Bus at Kadra and in turn led to

tripping of all elements

Annexure-II

Page 17 of 36


Kadra Power House of KPCL &

220kV Karwar SS of KPTCL

04-02-2019 at

20:19 hrs

During de-synchronising of Kadra unit#2, R-pole didn’t open

due to struck breaker condition. Pole Discrepancy operated.

All the connected 220kV lines at Kadra end were hand

tripped.

1) KPCL to ensure that DR and EL for all events are made

available. If Static relays with no DR are present in Station,

standalone Disturbance recorder and Event logger should be

provided.

2) KPCL to investigate the operation of Negative sequence

relay and report to SRPC since the operation of Negative

sequence relay due to stuck breaker condition is not proper

as per protection philisophy

KPCL Yet to be informed Pending


1. In view of operating 220kV Ambewadi SS in split bus mode, action is being taken up by

KPTCL. Problem in the 220kV bus coupler breaker is attended and isolator overhauling work is

under progress. Spilt bus operation at Ambewadi will be made possible at the earliest. ---

Pending

2. ICT Protection system at Ambewadi and trippings occured at Supa GS during the instance is

checked up and remedial measures already furnished in this regard.

---- Completed

Mail recieved on 29-07-2015:

1. Action is being taken by KPTCL for operating Ambewadi in split bus mode. Problem in bus

coupler breaker is attended.Isolator overhaulling work is completed.PTs are already provided

to 220kV Bus-II. After commissioning of Bus-II PTs, Ambewadi can be operated in split bus KPTCL Mail dated 16.12.2017 & Review Meeting dated 19.12.2017:

1. Recommended works at Ambewadi have not been taken up due to various problems faced

due to poor response from the turn key agency M/s ERL. A site meeting is planned during this

month to discuss about further plan of action for attending SRPC recommendations pertaining

to the Sub station.

The issue was discussed in the review meeting. Considering the importance of the substation

and delay in executing the works, it was decided to escalate all pending issues relating to

Ambewadi SS to KPTCL top Management for early completion.


1. The outstanding protection issues pertaining to Ambewadi were appraised to the

management and proposal for construction of new GIS SUb stations has been approved by

KPTCL management. In view of attending protection audit recommendations pertaining to

Ambewadi SS without linking with new Station proposal, action has been taken to include the

works in extended scope of R&U project awarded to M/s GE T&D India Limited. Addition

materials required are yet to be supplied by M/s GE.


Procurement of Bus bar and LBB protection is in the final tendering stage. 2. Action is being

taken to restore the carrier protection for 220kV Sedam-Tandoor line. AR will be enabled.


1. Procurement of Bus bar and LBB protection is in the final tendering stage.

2. Action is being taken to restore the carrier protection for 220kV Sedam-Tandoor line. AR will

be enabled after restoration of PLCC.

KPTCL mail received on 23-01-2016:

1. Bus bar protection panels pocured and erected at Sedam. Wiring , testing ,commissioning is

being taken up.Planned to complete by April 2016.



KPTCL Mail recieved dated 22-11-2017:

1 & 2). Bus Bar Protection panel and required Wave traps are supplied under R&U. Wave trap

to be commisioned in Tandoor line and PLCC to be restored.Once PLCC is restored AR will be

enabled. The Wave traps required are supplied under R&U project and the same is to be

commisioned at Sedam end for restoration of PLCC.


1 & 2) Replacement of Bus Bar Protection is included under R&U project. Awarded to M/s GE

Ltd. Panels have alredy been supplied by the Agency. The work will be taken up on top priority.


KPTCL informed that the works relating to put A/R in service are going on at their Sedam SS,

and assured that it would be put into service by February, 2018.


1). Bus Bar Protection Work is under progress. Work will be completed in 2 months.

---- Pending

2). ---A/R was enabled from Sedam end on 03.11.2018 ----Completed.

PendingKPTCLTriggering incident was B-phase to earth fault in 220kV

Ambewadi- Nagzari line-1. B-pole of breaker did not open at

Ambewadi end. LBB protection not available at Ambewadi

end. All elements tripped on Zone-2 from remote ends.

22-12-2014

at 21:22 hrs

R-Phase to ground fault occurred on 220kV Sedam-Shahpur

line. Fault not cleared from Sedam end due to stuck-breaker

condition. While the Sedam- Sahapur line tripped from

Shahapur end in Zone-1, the other 220 kv lines from Sedam

tripped at remote ends in Zone-2. This caused complete

outage of 220kV Sedam substation.

GD-1 at 220kV Ambewadi

Station of KPTCL

27-01-2015 at 8.00

hrs

Complete outage at 220kV

Sedam Substation of KPTCL (GD-

1)

KPTCL

1. Till the completion of R&M works for bus bar and LBB

protection, KPTCL shall explore the possibility of having split

bus operation at Ambewadi and submit the details of the

same to PCSC forum.

2. KPTCL shall provide the details of the tripping of Supa

hydro station connected downstream from 110 kV bus.

1. KPTCL to provide Bus bar and LBB protections for 220 kV

bus at Sedam S/s.

2. KPTCL to implement A/R feature on 220 kV Sedam-

Tandur inter-state line.

40/I/1

41/I/4 Pending

Annexure-II

Page 18 of 36


Sedam substation of KPTCL

15-02-2015

at 14:24 hrs

Fault occurred in 220kV Sedam-Shahpur line 1. KPTCL to provide Bus Bar protection and LBB protection at

Sedam S/s and furnish the status of their implementation to

PCSC forum.

2. KPTCL to implement A/R feature on 220 kV Sedam-Tandur

inter-state line.

KPTCL Mail received on 27-05-2015:

1. Bus Bar protection will be provded under R&U.

2. A/R yet to be enabled.





KPTCL Mail Recieved dated 22-11-2017:

Bus Bar Protection panel and required Wave traps are supplied under R&U. Wave trap to be

commisioned in Tandoor line and PLCC to be restored.Once PLCC is restored AR will be

enabled.


1. Replacement of Bus Bar Protection is included under R&U project. Awarded to M/s GE Ltd.

Panels have alredy been supplied by the Agency. The work will be taken up on top priority.

2. AR feature will be enabled during retrofitting of Main-2 relays.


1 & 2) KPTCL informed that the works are under progress and are targeted to be completed by

February, 2018.


1). Bus Bar Protection commissioning works under progress. Work will be completed in 2

months.

2). Attended. --- Completed

Pending





KPTCL Mail Recieved dated 22-11-2017 & 16.12.2017:

1.Enabling the AR feature was discussed during PCSC meetings and since Ambewadi-Ponda and

Ambewadi-Xeldom lines are radial lines, it was decided that enabling AR is not required. To

clear the faults in the abovelines early, the timings of the Zone 2 was reduced to 150mS and the

Back Up EFR timings have been reducedto 150mS. --- Completed

2.The planned works as per R&M could not be taken up due to the problem with the vendor

and could not be taken up under R&U project due to administrative reasons. ---- Pending


2. The issue was discussed. Considering the importance of the substation and delay in

executing the works, it was decided to escalate all pending issues relating to Ambewadi SS to

KPTCL top Management for early completion.


The protection issues pertaining to Ambewadi was appraised to the management and

proposal for construction of new GIS SUb stations has been approved by KPTCL management.

Further as per SRPC directions and in view of attending protection audit recommendations

pertaining to Ambewadi SS without linking with new Station proposal, action has been taken to

include the works in extended scope of R&U project awarded to M/s GE T&D India Limited.

Addition materials required are yet to be supplied by M/s GE. work expecnted to be completed

in 5 months.

KPTCL1. KPTCL shall provide A/R feature on Ambewadi – Ponda 220

kV D/C inter-state line.

2. Till the completion of R&M works for bus bar and LBB

protection, KPTCL shall explore the possibility of having split

bus operation at Ambewadi and submit the details of the

same to PCSC forum.

Fault in 220kV Ambewadi-Nagjheri line-2Complete outage of 220 kV

Ambewadi substation of KPTCL

12-03-2015 at 7:51

hrs

42/I/2

(GD)

Pending

Annexure-II

Page 19 of 36

48/I/3 Outage of 220kV Ambewadi

station in Karnataka

30-09-2015 at 10:41

hrs

220kV Ambewadi-Nagjheri line-2 tripped on B-phase to earth

fault. This resulted in loss of supply to 220kV Ambewadi bus.

220kV Ambewadi-Ponda line-1&2 were hand tripped after

deenergization of bus at Ambewadi.

KPTCL to fast-track providing A/R on all 220 kV lines

emanating from Ambewadi SS to prevent Station shut-down

on temporary faults.

KPTCL KPTCL mail received on 23-01-2016:

Will be complied in a months time.


Enabling the AR feature was discussed during PCSC meetings and since Ambewadi-Ponda and



Back Up EFR timings have been reducedto 150mS.


Enabling the AR feature was discussed during PCSC meetings and since Ambewadi-Ponda and



Back Up EFR timings have been reduced to 150mS. In view of the above, it is requested to drop

the issue from this list.


KPTCL informed that AR would be enabled at Ambewadi end for lines other than Ponda and

Xeldom lines during retrofitting of Back Up protection by Distance protection relay at

Ambewadi.

Considering the importance of the substation and delay in executing various works, it was

decided to escalate all pending issues relating to Ambewadi SS to KPTCL top Management for

early completion.

Pending


The protection issues pertaining to Ambewadi was appraised to the management and

proposal for construction of new GIS SUb stations has been approved by KPTCL management.

Further as per SRPC directions and in view of attending protection audit recommendations

pertaining to Ambewadi SS without linking with new Station proposal, action has been taken to

include the works in extended scope of R&U project awarded to M/s GE T&D India Limited.

Addition materials required are yet to be supplied by M/s GE. work will be completed in 5

months

KPTCL Mail received dated 25-05-2016:

SEE, RTC, Bangalore to update the status


Providing numerical bus bar protection to 400kV buses and GPS time synchronising equipment

at Guttur is considered under R&U. Work is awarded to M/s Alstom, execution will be taken up

shortly.


GPS and accessories will be supplied during May 2017, expected to complete the work within a

month after supply of materials.


As discussed during the earlier PCSC meetings, current limit of 12.5KA has been added in the

logic of AR at Guttur end to prevent reclosing during failure of LA or any other very close faults.

Replacement of existing static BBP by new numerical BBP with Main 1&2 will be taken up at

Guttur for which the panels are already supplied. Presently, replacement of 220KV side Bus bar

protection is under progress. DI for delivery of GPS receiver has already been issued, but there KPTCL Mail dated 16.12.2017:

1). The work of replacing static type 400kV Bus Bar Protection scheme by numerical BBP is

under progress at Guttur.

--- Pending

2). GPS time syncronising device is expected to be supplied before end of December 2017 ---

Pending


1) & 2) KPTCL informed that the works are under progress, and are targeted to br completed by

February, 2018.


GPS time synchronisaionis provided for protection relays under R&U project. Replacement of

400kV BBP by numerical BBP is envisaged under R&U works. Additional quantity of controls

cables required to take up the BBP replacement work. Supply of control cables awaited.


1. Replacement of static BBP provided to 400kV side by numerical BBP and the work of

providing DR/ EL collection system is under progress. Work will be completed in 3 months -----

Pending

2. GPS time synchronising equipment already commissioned.

--- Completed.

17-01-2016 at 18:53

hrs

Multiple tripping at 400kV

Guttur SS

Failure of Lightning Arrestor of Y-phase Line Reactor of 400kV

Guttur-Hiriyur line-1 and line tripped on distance protection

Zone-1. Bus-bar protection of 400kV Bus-2 at Guttur

substation also got operated during the event sensing this

through fault. 400/220 kV ICT-1 & 2 at Guttur, 400kV Kaiga-

Guttur-2, 400kV

Guttur-Narendra-2, 400kV Guttur-Hiriyur-2 and 400kV Guttur-

Munirabad which are on 400kV Bus-2 got tripped during the

incident. 400kV Guttur-Narendra-1 which was on Bus-1 also

tripped at the same time.

KPTCL 1. KPTCL to configure all DR’s and EL’s at 400 kV Guttur SS so

that they will also get triggered for BBP operation.

2. KPTCL to ensure time-synchronization of all DR’s and EL’s

with GPS at their 400 kV Guttur SS.

51/II/21 Pending

Annexure-II

Page 20 of 36


Replacement of existing BBP by new BBP with 4 zone protection is being taken up under R&U.


GE Ltd has already supplied the necessary Bus Bar protection panels for replacement of the

existing static type BBP by new numerical BBP with 4 zone protection under R&U project. The

work of commissioning the same will be taken up shortly.


Due to operational constraints two/ multi bus operation is not being implemented.


It was noted that Shimoga SS is having required configuration for providing double-bus

operation. However, due to large no. of feeders (15 in no) with variable gneration at certain

remote ends like Varahi, the flows on these lines are bound to vary. As such it is necessary to

zero in on appropriate arrangement of feeders on different buses so that bus-isolators of the

feeders are not overloaded.

The issue was discussed. KPTCL was asked to try out multi-bus operation on trial basis to arrive

at suitable arrangement of feeders.


Bus sectionaliser breakers have to be provided for operating Shimoga in multi bus mode.

Estimates have to be prepared by CEE,TZ,Hassan. Work expected to be completed in 1 year.


1. The necessary Bus Bar protection panels are already supplied to Chikkodi under R&U project.

Presently R&U works at sub stations subjected to audit are taken up. After completion of PAR

works, the baove works are planned.

--- Pending

2. --- Pending

3. --- Pending


1.The necessary Bus Bar protection panels are already supplied to Chikkodi under R&U project.

Control cables have to be supplied. Presently R&U works at sub stations subjected to audit are

taken up. After completion of PAR works at 26 Sub stations, remaining works will be taken up

through M/s GE.

--- Pending.

2. --- Pending

3. --- Pending


1. KPTCL informed that BBP would be provided by April, 2018.

---- Pending

2. KPTCL informed that DPR settings had been reviewed.

---- Completed

3. EFR on failure of B-ph PT of 220 kV Bus-2 had been furnished to CEA. ---- Completed


1). Bus Bar Protection work is included under R&U. work expected to be completed in 3

months ---- Pending

2). Major equipment failure reports are being sent to CEA regularly ---- Completed.

01-07-2016 at 03:03

hrs

Tripping of 220 kV Chikkodi-

Mudshingi and 220 kV Chikkodi-

Talandage lines

220kV Bus Bar protection operated during failure of R phase

CT in DVG-2 line bay.

22-02-2016 at 15:03

hrs


Shimoga substation

57/II/1 PendingKPTCL1.KPTCL to take steps to provide busbar protection at their

220 kV Chikkodi inter-regional substation, and furnish a time-

line for the same.

2.KPTCL to review distance protection settings for 220 kV

Chikkodi – Kudachi line.

3.KPTCL to furnish equipment failure report of the current

incident to PSE&TD Division of CEA with a copy marked to

SRPC.

Triggering incident was failure of B-ph PT of 220kV Bus-2

(western bus) at 220KV Chikkodi substation. 220KV Chikodi-

Belgaum-I line tripped on DEFR (Inst), 220KV Chikkodi-

Kudachi line tripped on Distance protection and also 100MVA

transformer-2 tripped on E/F protection.

KPTCLKPTCL to operate 220 kV Shimoga on multi-bus operation

under normal conditions, and put it on single-bus operation

only under emergency conditions.

52/I/3 Pending

Annexure-II

Page 21 of 36

KPTCL mail received dated 25.04.2017:

Numerical BBP is being provided under R&M works.


1. Numerical Bus Bar protection panels have already been supplied as a part of R&M works

awarded to GE Ltd. Due to issue regarding the sectionaliser CTs, the work had stopped. Now

the same is resolved and the the above work will be taken up after supply of sectionaliser CTs. --

- Pending

2. --- Pending


1. Numerical Bus Bar protection panels have already been supplied as a part of R&M works

awarded to GE Ltd. Due to issue regarding the sectionaliser CTs, the work had stopped. Now

the same is resolved and the the above work will be taken up after supply of sectionaliser CTs. --

- Pending

2. --- Pending


1. KPTCL informed that BBP at 220 kV Hoody would be provided by March, 2018.

---- Pending

2. EFR on failure of R-ph CT of 220/ 66 kV Transformer-2 had been furnished to CEA. ----

Completed


1). The R&M work of 220kV Hoody SS is under progress and expected to be comleted before

the end of August 2019. Providing Bus Bar Protection to 220kV buses is a part of R&M work at

Hoody ----- Pending

62/II/5 Tripping of 220 kV South Bus

and connected elements (220kV

HSR, 220kV Nagnathpura, 220 kV

Harohalli, 220 kV

Subramanyapura, 220 kV

Tataguni, 220 kV Mallur and

400/220kV ICT-2 and 3) at

400/220kV Somanhalli

substation of KPTCL

(Load loss: 850 MW)

20-01-2017 at 14:34

hrs

Triggering incident was fault in 66 kV Somanahalli -

Bannerghatta line and fault was cleared by operation of Back-

up OCR at Somanahalli end.

KPTCL to provide numerical Busbar Protection at their 220 kV

Somanahalli SS at the earliest.

KPTCL KPTCL mail received dated 25.04.2017:

Numerical BBP is being provided under R&M works


Tesing & Commissioning of numerical BBP at Somanahalli is under progress. There was some

technical issue wth BBP scheme supplied to Somanahally which is being finalised in

consultation with OEM SIFANG. Numerical BBP will be commissioned at Somanahally within a

month's time.


Numerical Bus Bar protection Scheme will be commissioned at Somanahally before end of

December 2017.


The work of providing Bus Bar Protection to 220kV buses is incuded under R&M works

envisaged at Somanahally. The R&M work is expected to be completed before end of March

2019 ----- Pending

Pending


Ambewadi station

02-04-2018 at

13:46hrs

Loss of supply occurred to 220 kV Ambewadi station due to

tripping of 220kV Nagzhari-Ambewadi line-2 (Source) from

Nagzhari power station. After bus dead, Ambewadi-Ponda

lines – 1 & 2 were hand-tripped. In antecedent conditions,

220kV Ambewadi - Nagjheri ckt-1, 220kV Ambewadi-

Narendra Ckt-1 &2 were out of service.

1). KPTCL to review operation of SPS at NPH for proper

functionality and changed network conditions (reduction of

generation with tripping of evacuating lines) and put it into

service at the earliest.

2). KPTCL to furnish equipment failure report of the current

incident (R-phase CT in Nagjheri – 1 bay at Ambewadi SS) to

PSE&TD Division of CEA with a copy marked to SRPC.

KPTCL KPTCL mail dated 20.12.2018:

1). To be reviewed. Expected to be completed in 1 month.---- Pending

2), Being followed ----- Pending

Pending

74/II15 Multiple Trippings at 400/220kV

Guttur station

21-04-2018 at 12:50

hrs

Triggering incident was fault in 220 kV Davanagare - Shimoga

line. Bus bar protection operated at Guttur resulting in

tripping of all the connected elements. 220 kV Guttur was on

single bus operation due to CVT problem in Bus-2.

KPTCL to put double-bus operation at their 220 kV Guttur

substations by attending to Bus-2 CVT problem.

KPTCL KPTCL mail dated 20.12.2018:

Bus-2 CVT problem is attended. However due to breaker replacement works, 220kV side

operated in single bus mode.


KPTCL informed that double-bus operation at their 220 kV Guttur would be provided within

two months.

Pending

79/III/9 Tripping of 400 kV JSWEL

–Guttur line

29-09-2018

at 11:30 hrs

R-phase to earth fault occurred in line. Auto-reclose was not

attempted at JSWEL due to DT receive. At Guttur end auto-

reclose could not be validated with DR/EL.

KPTCL to furnish a detailed report on tripping event bringing

out reasons for DT sending from Guttur end to JSWEL on 400

kV Guttur - JSWEL line along with remedial action taken to

PCSC forum.

KPTCL Review Meeting on 21.12.2018:

KPTCL was aksed to furnish status of implementation of the recommendation given at the

earliest.

Pending

80/II/7 Tripping of 400 kV JSWEL-Guttur

line

17-10-2018 at 02:04

Hrs

Triggering incident was R-phase to earth fault in line. At

Guttur end there was operation of pole discrepancy and

resulted on tripping of Y & B pole after a duration of 2

seconds from the occurrence of fault. FIR, DR & EL of Guttur

end were not furnished.

KPTCL to examine the reasons for sending of DT from Guttur

end to JSWEL end, and furnish an action taken report

including remedial measures taken to rectify the same.

KPTCL Yet to be informed Pending


Ambewadi Station of KPTCL

06-02-2019 at

14:51hrs

Fault occurred while test charging of 220kV Ambewadi –

Nagjheri Line -2 from Ambewadi end. Suspected stuck

breaker condition at Ambewadi end) led to clearing of fault

by tripping of remote end breaker in Zone-2. LBB protection

is not active at 220kV Ambewadi station.

KPTCL to investigate the reason for non-tripping of 220kV

Ambewadi - Nagjheri line-2 on operation of SOTF and submit

a report regarding the same to SRPC. Also KPTCL to take

necessary measures in order to ensure healthiness of breaker

before testcharging of any line.


KPTCL1. KPTCL to provide Busbar protection at their 220 kV Hoody

SS at the earliest.

2. KPTCL to furnish an Equipment Failure Report on CT failure

to CEA with a copy marked to SRPC.

Failure of R-phase CT of 220/ 66 kV transformer-2 at 220kV

Hoody end resulted in a bus fault in 220kV Bus-2. Fault was

cleared by backup protection of ICT's (220kV lines were being

radially operated) due to absence of busbar protection

09-01-2017

at 23:06 hrs

Tripping of 220 kV Bus 2 and

connected elements (220kV HAL

#1 and 2, 400/220 kV ICT- 1, 2

and 220/66 kV ICT-2) at 400/220

kV Hoody substation of KPTCL

(Load loss : 590 MW)

62/II/3 Pending

Annexure-II

Page 22 of 36


Alipura substation

20-02-2019 at 12:45

hrs

As informed by KPTCL, Suspected delayed clearance of fault

in 220 kV BTPS-Lingapur line from BTPS end resulted in

tripping of lines from Alipura S/s.

1) KPTCL is recommended to furnish detailed report

regarding spurious operation of DEF at Alipur SSand check

the directionality of DEF on all lines.

2) KPTCL is requested to share the revised zone settings for

Distance protection at BTPS end.


82/II/12 Tripping of 400kV Kaiga-Guttur

line-1&2

07-02-2019

at 11:49 hrs

Line-1 tripped due to insulator flashover. Line-2 tripped due

to zone-3 operation at Kaiga and Direct trip receive at Guttur

KPTCL is recommended to take necessary measures to

ensure that Main-I and Main-II at Guttur end shall be of

different types (make and model) coherent with the general

protection philosophy followed in SR region.


Annexure-II

Page 23 of 36


1. coordination of KPCL has been requested for enabling AR lines terminated to Nagajari.

2. AR will be enabled at Ambewadi end for lines other than Ponda and Xeldom lines during

retrofitting of Back Up protection by Distance protection relay at Ambewadi.

KPTCL Mail dadted 16.12.2017 & Review Meeting dated 19.12.2017:

1. KPTCL informed that Coordination of KPCL has been requested for enabling AR lines

terminated to Nagajari.

--- Pending

2. KPTCL informed that AR would be enabled at Ambewadi end for lines other than Ponda and

Xeldom lines during retrofitting of Back Up protection by Distance protection relay at

Ambewadi. -- Pending


2). Readiness from KPTCL for implementing AR is already confirmed to KPCL. Decision pending

from KPCL end.


1). KPCL informed that A/R will be provided on all 22 kV lnies emmanating from Nagjheri PH

within 3 months time ----- Pending



Numerical Line protection relays having IEC61850. Prepration of specification is under progress.

Status informed during Special Meeting held on 03.06.2016:

1. KPTCL informed that the matter had been taken up with concerned Line Operation and

Maintenance wing to carry out corridor clearance and maintenance as per schedule to avoid

frequent line faults in this corridor. A letter had also been addressed to Chief Engineer,

Bhagalkot zone, to ensure lines in & around Kali complex are maintained in healthy condition. ---

Completed

2. KPTCL assurd that the final modified SPS would be implemented at Nagjheri PH at the

earliest. ------ Pending

3. KPCL informed that Nagjhari- Kodasalli Lines 1 & 2 had been kept in service since 23.05.2016

@ 08.06hrs.

--- Completed

KPTCL Mail received dated 28-06-2016:KPTCL Mail dated 16.12.2017:

1) & 3). --- Completed.

2). Proposed revision in existing SPS scheme is already submitted to SRLDC/SRPC., yet to be

discussed and approved by the SRPC forum --- Pending


2. The SPS proposed by KPTCL was discussed and the PCSC forum suggested certain changes for

suitable incorporation. KPTCL agreed to look into the same and assured that the modified SPS

would be furnished by January, 2018.


2. KPTCL informed that Nagjheri SPS shall be finalised in 1 month.

KPCL mail dated 23.01.2019 & 23.03.2019:

1) .....Completed


3) .....Completed


Ambewadi Substation of KPTCL

29.10.2015 at 14:34

hrs

220kV Nagjheri-Ambewadi line-1 tripped at 13:33 hrs due to

B phase to earth fault. Ambewadi was radially fed from

Nagjheri power station through 220kV Nagjheri-Ambewadi

line-2. Tripping of this line caused 220kV Bus shut down at

Ambewadi and remaining lines and transformers were hand

tripped

1. KPCL to provide A/R on all 220 kV lines emanating from

Nagjheri PH.

2. KPTCL to provide A/R on all 220 kV lines emanating from

Ambewadi SS.

KPCL/ KPTCL Pending

220kV lines from Nagjheri power house started tripping from

11:00 hrs due to fault in lines. The sequence of tripping is

shown in SOE list. At 12:33 hrs, 220kV Narendra-Ambewadi

lines-1&2 got tripped which resulted in loss of evacuation

path to Nagjheri station resulting in tripping of running Units

and complete outage at Nagjhheri power station. 220kV

Ambewadi station also got de-energized due to tripping of

source feeders i.e. 220kV Narendra-Ambewadi-1&2 and

220kV Nagjheri-Ambewadi-1&2.

22-02-2016 at 12:36

hrs


Nagjheri power station and 220

kV Ambewadi substation of

KPTCL

1. To avoid tripping of transmission lines on transient faults,

KPCL/ KPTCL is recommended to carry out periodic patrolling

of lines, and ensure their proper maintenance by carrying out

jungle/ bushing clearance and trimming of tree branches

within the RoW of transmission lines as per the SRPC

transmission line patrolling guidelines (available under the

menu item "All Uploads/ Operation/ Miscellaneous/

Transmission Line Patrolling Protocol / Guidelines for

Southern Region" on SRPC website).

2. KPCL/ KPTCL to review operation of SPS at NPH for

functionality (reduction of generation with tripping of

evacuating lines) and healthiness.

3. KPCL to put 220 kV Kodasalli - Nagjheri D/C lines into

service if more than 200 MW generation from Kali Complex

(with Nagheri Contribution not less than 50 MW) is ensured

on sustained basis.

51/I/3 KPCL/ KPTCL Pending

Annexure-II

Page 24 of 36

KPCL mail dated 23.01.2019 & 23.03.2019:

1) …Completed.


3) …Completed.

TANGEDCO

Tamil Nadu

25-01-2017 at 22:36

hrs

PendingTANGEDCO mail dated 15.04.2017:

1) New Relay is tested and ready for replacement.Now all 5 units are in service.The relay will be

replaced when lesser units are in service. --- Pending

2.a)Steps are taken to renovate & mordernization of all the control panel into Numerical based

control panels. --- Pending

2.b) Since 230 KV indoor switchyard has no spare space providing dual CT`s is not fessible. --

Completed

3) Procurement of EL & DR is under progress. --- Pending

TANGEDCO mail dated 26.04.2017:

1) Check zone New Relay is replaced on 17.04.2017 -- Completed.

2. --- Pending

3. --- Pending

TANGEDCO mail dated 13.12.2017:

2).P & C wing gives clearance to TTPS to procure the Bus bar protection relays and protection

relays and SER / DR system vide Lr.CE/P&C/SE/D/EEPC4/AEE3/F.TECH/D.27/17 Dated:

05.10.2017. To get administrative approval budgetary offer has bar protection relay from

various companies ----Pending

3). SRPC vide Lr: SRPC/SE- III/CEA/2017/6450/DT:27.10.2017 gives features of SER/DR.

Budgetary offer will be called for SER / DR having above features. ---Penidng


2) & 3) The issue was discussed and TANGEDCO was asked to provide time-line for

implementing the recommendations.

Mail dated 29.01.2018:

Procurement work is under progress and will be completed by December 2018.


TANTRANSCO informed that Tender would be floated by January 2019 and Procurement is

expected by APril 2019. Works would be completed by December 2019.


Modifications to be carried in Nagzari SPS logic is submitted to SRLDC/SRPC for verification

and approval


1. Tripped since there was evacuation problem and there were only two lines NA-1 and NA-2 ---

- Completed

2. Will be reviewed in consultation with EE(RT), KPTCL, Hubli. --- Pending

3. Both the lines are in charged condition. --- Completed.


2. Proposed revision in existing SPS scheme is already submitted to SRLDC/SRPC., yet to be

discussed and approved by the SRPC forum. --- Pending


1) & 3). --- Completed.

2). Proposed revision in existing SPS scheme is already submitted to SRLDC/SRPC., yet to be

discussed and approved by the SRPC forum --- Pending


2. The SPS proposed by KPTCL was discussed and the PCSC forum suggested certain changes for

suitable incorporation. KPTCL agreed to look into the same and assured that the modified SPS

would be furnished by January, 2018.


KPTCL informed that Nagjheri SPS shall be finalised in 1 month.

KPCL/ KPTCLComplete outage of 220kV

Ambewadi station of KPTCL and

220kV Nagjheri of KPCL

18-03-2016 at 14:40

hrs

Ambewadi Narendra line-2 tripped on fault and 220kV

ambewadi Narendra line-1 tripped due to over-loading.

Running Units at Nagjheri also tripped during the event due

to tripping of evacuating lines

1. KPCL to furnish a report on the reasons for Unit-6 tripping

at Nagjheri PH.

2. KPCL/ KPTCL to modify suitably the SPS at Nagjheri Power

House such that it would also factor in the over loading of

Ambewadi-Narendra lines.

3. KPCL to put 220 kV Kodasalli - Nagjheri D/C lines into

service if more than 200 MW generation from Kali Complex

(with Nagheri Contribution not less than 50 MW) is ensured

on sustained basis.

Failure of Bus Section-I Y-ph CT resulted in operation of bus-

bar protection for Bus Sections -I & II. Running Units#1, 4 and

5, 230 kV Kayathar, 230kV Kudankulam, 230kV Sterlite,

Station Transformer-1, 2 & 3 got tripped during the incident.

Unit – 2 & 3 were not in service.

Tripping of running Units &

230kV feeders at Tuticorin TPS

of TANGEDCO

(Gen Loss: 640 MW)

Pending

62/II/7 1. TANGEDCO to replace existing Check-Zone relay with a

new one possessing required performance.

2. TANGEDCO to take steps to provide numerical busbar

protection at their 220 kV Tuticorin TPS. TANGEDCO may also

explore providing dual CT’s (on either side) for all B/S

breaakers at the time of commissioning of numerical BBP, if

there were no space constraints.

3. TANGEDCO to take steps to provide for standalone Event

Logger (EL) and standalone Disturbance Recorder (DR) with

automatic downloading facility to a centralized server.

53/I/3

Annexure-II

Page 25 of 36

TANTRANSCO Mail received on 19-02-2016 and 24-03-2016:

Revision of Bus Bar Protection setting was carried out. The stabilizing voltage setting was

raised from 410 to 450 volts. After completing the necessary test, the bus bar protection put in

to service on 29.12.2015.

Mail Received on 27-04-2016 ,16-06-2016,25-07-2016 & 24-09-2016:

Revision of Bus Bar Protection setting was carried out. After completing the necessary test, the

bus bar protection put in to service on 29.12.2015.

Mail received on 10-11-2016 & 20.12.2016:

Provision of Bus Coupler bay arrangement was included in the Upgradation works proposed and

the same was sanctioned by MoP through PSDF.

Numerical relay allotted and being commissioned.


Numerical BBP relay was commissioned on 02.02.2017

Status received vide mail dated 12.04.2017 & 01.06.2017 & 15-06-2017:

Numerical BBP relay was commissioned on 02.02.2017.

Provision of Bus Coupler bay arrangement was included in the Upgradation works proposed and

the same was sanctioned by MoP through PSDF.


Numerical BBP relay was commissioned on 02.02.2017.Status received vide mail dated 18-09-2017 & 31-20-2017:

Numerical BBP relay was commissioned on 02.02.2017. Provision of CT in Bus Coupler bay is

arranged and zone segregation will be provided.

Status received vid email dated 12-12-2017:

Numerical BBP relay was commissioned on 02.02.2017. Provision of CT in Bus Coupler bay has

been allotted. Zone segregation will be provided after commissioning of CT.


TANTRANSCO informed that the recommendation would be complied with by March, 2018.

TANTRANSCO Mail received on 25-01-2018:

Provision of CT in Bus Coupler bay is arranged and zone segregation will be provided. Timeline:

March-2018.


Bus coupler bay equipments allotted will be commissioned by Aug 2018


Commissioning of CT in Bus Coupler bay is under progress


Commissioning of CT in Bus Coupler bay is under progress Will be completed by Oct.2018.


Civil work completed & CT will be commissioned after strengthening Bus .2 conductor

jumpers.Awaiting Bus LC Time line before January 2019.


Erection under progress will be completed before 31.01.2019


Buscoupler bay will be commissioned by June 2019

TANTRANSCO to examine the feasibility of providing two

main-zone operation for bus bar protection by exploring

various alternatives like replacing existing bus-coupler CB

with a hybrid bus-coupler CB that comes with inbuilt CT,

replacing existing BBP relay with another suitable relay that

supports two main-zone operation, and implement the same.

PendingBusbar protection got operated for a fault in 230kV Mywadi-

Anaikadavu line

21-12-2015 at 6:28

hrs


Mywadi station of TANTRANSCO

TANTRANSCO

Annexure-II

Page 26 of 36

TANTRANSCO mail received on 25-01-2018:

1) Commissioning of Bus Coupler CT, Extended Bus with Additional Bus Coupler is under

progress. Timeline: June-2018.

2) Numerical BBP commissioned on 29.08.2017 to enable Bus seggregation.

3) Providing Re-Trip feature for LBB will be studied.


Providing new Bus coupler bay involes bay shifting work.work awarded and under progress.

Time line. Dec2018.



Time line. Dec2018.



Time line. Dec2018.


Bus coupler erected and commissioning schedule on 18.12.2018.


1. Bus coupler errected and commissioning would be completed by January 2019 --- Pending

2. -----Completed

3. Works would be completed by Janaury, 2019 --- Pending.


work under progress & will be commissioned on or before 31.01.2019


Commissioned on 03.02.2019

Mail recieved on 25-07-2016 & 24-09-2016:

TANTRANSCO: Auto Transformer-2 HV side Bus isolator 'C'-phase support insulator of 230kV

Southern Bus was replaced and Bus Bar Protection scheme was restored on 12.05.2016.

Status received vide mails received on 10-11-2016 & 20.12.2016 & 12.04.2017 & 01.06.2017 &

15-06-2017 & 04.08.2017 & 18.09.2017:

CT is not available in the Bus Coupler bay for zone segregation. CT latch relay is to be provided

for all bays for zone segregation.

Status received vide mails received on 31-10-2017 & 12-12-2017:

Numerical Bus bar protection panel allotted and will be commissioned with zone segregation..


TANTRANSCO informed that Numerical BBP would be commissioned by March, 2018.


Commissioning of Numerical Bus bar protection is under progress. Zone segregation will be

ensured. Timeline: March-2018.


CMR relay for extending LBB protection was released and LBB extended from Distance

Protection relay directly. CT is not available in the Bus Coupler bay for zone segregation.

However, during commissioning of third ICT, Bus section Breaker will be provided for zone

segregation. Numerical BBP relay will be provided.

Status received vide mails recieved on 27-04-2016 and 20-05-2016 ,16-06-2016, 25-07-2016, 24-

09-2016,10-11-2016 & 20.12.2016 & 12.04.2017 & 01.06.2017 & 15-06-2017:

1 & 2) CT is not available in the Bus Coupler bay for zone segregation. However, during

commissioning of third ICT, Bus section Breaker will be provided for zone segregation.

Numerical BBP relay will be provided.


1 & 2) Contract awarded for providing third ICT & Bus modification works to accomodate bus

coupler bay. Numerical BBP relay has been provided and tesing under progress.



coupler bay. Numerical BBP relay has been provided and tesing under progress.



coupler bay.

Pending51/I/1

(GD)

Complete outage of 230kV

Madurai S/s (Chekanaurani) of

TANTRANSCO

19-01-2016

at 11:56 hrs

Fault had occurred in 230kV Madurai-Sembatty line. Trip

from distance relay was not extended to breaker due to

protection DC fail. LBB protection got operated resulting in a

busbar trip at 230kV Madurai substation. All elements got

tripped as there is a single bus operation at 230kV Madurai

S/s

1. TANTRANSCO to provide split-bus operation with bus

sectionalizer CB for their 230 kV Madurai (Chekanurani) SS.

2. TANTRANSCO to provide two main-zone operation for the

numerical BBP that is being commissioned.

3. TANTRANSCO to examine the feasibility of providing Re-

Trip feature for the LBB protection, and accordingly take

steps for implementing the same.

TANTRANSCO

55/I/1

(GD)


Gummidipoondi Station of

TANTRANSCO

12-05-2016 at 12:15

hrs

Flashover of Auto Transformer- 2 HV

B-phase Isolator supporting insulator of 230kV Southern Bus

occurred at Gummidipoondi station. At the time of fault, Bus

bar protection relay was not in service for pre-commissioning

testing of Auto Transformer-2. All feeders got tripped due to

operation of zone-2 protection from remote ends.

TANTRANSCO to take steps to provide double-bus operation

at their 230 kV Gummidipoondi SS.

TANTRANSCO Pending

Annexure-II

Page 27 of 36


Numerical Busbar protection relay commissioned on 14.05.2018


Control & Status of isolator feedeback to be provided by replacement of Drive Mechanism box.





Timeline requested upto Dec 2018.


1. TANTRANSCO: Estimate sanctioned for replacement of defective isolator status feedback.

Work under progress. Lightning mask work under progress will be completed within three days.


TANTRANSCO informed that Double bus operation would be provided by March, 2019.


Isolator status will be ensured by March 2019


New 230kV isolators have been allotted for replacement of defective isolators. Hence time line

requested upto June.2019

55/I/1

(GD)


Gummidipoondi Station of

TANTRANSCO

12-05-2016 at 12:15

hrs

Flashover of Auto Transformer- 2 HV

B-phase Isolator supporting insulator of 230kV Southern Bus

occurred at Gummidipoondi station. At the time of fault, Bus

bar protection relay was not in service for pre-commissioning

testing of Auto Transformer-2. All feeders got tripped due to

operation of zone-2 protection from remote ends.

TANTRANSCO to take steps to provide double-bus operation

at their 230 kV Gummidipoondi SS.

TANTRANSCO Pending

Annexure-II

Page 28 of 36

The issue was discussed in PCSC-58 meeting held on 18.10.2016, when PCSC forum agreed to

de-link the implementation of the Item from the scope of Protection Audit Recommendations

(PAR), and pursue it as part of PCSC Recommendations.

Status received vide mails dated 10.01.2017 & 12.04.2017 & 01.06.2017 &15-06-2017 &

04.08.2017 & 18.09.2017 & 31-10-2017& 12-12-2017:

Different make Relays will be provided for Main-I & II relays at Sunguvarchatram end in a

phased manner.


TANTRANSCO informed that the recommended works of providing different make Relays for

Main-I & Main-II are targeted to be completed by September, 2018.



phased manner. Timeline: September-2018.


TANTRANSCO informed that the recommended works of providing different make Relays for

Main-I & Main-II are targeted to be completed by September, 2018.


provision of Different make Relays for Main-I & Main-II will be completed by September,

2018.







TANTRANSCO MAIL DATED 11-12-2018:


phased manner. Timeline: September-2019



phased manner. Timeline: September-2019

14-09-2016 at

11:13Hrs

Bus Bar Protection (Zone-2) of 230 kV Bus-B got operated at

Alamathy Station during fault in 230 kV Alamathy-Korattur

feeder.

58 Different type and Make of distance protection relays to be provided for Main-I & Main-II protection for 230kV feeders at 400 kV Sunguvarchathiram & 230 kV Sunguvarchathiram

Substation [Carry-Over from Protection Audit Recommendations]

TANTRANSCO Pending

Mail received on 10-11-2016 & 20.12.2016:

1. The Bus Bar Protection scheme will be tested for healthiness including the CT circuits.

2. High impedance BBP relay will be replaced by Numerical relay.

Status received vide mails dated 10.01.2017 & 12.04.2017 & 01.06.2017 & 15-06-2017:

1. The Bus Bar Protection scheme was tested for healthiness including the CT circuits. AREVA

make CTs in Alamathy SS are having different kneepoint voltage for the cores. CT cores of

higher knee point voltage has been choosen for BBP in 230kV Korattur, 230kV OPG-1 & 230kV

OPG-2 feeders on 29.11.2016. ---- Completed.

2. High impedance BBP relay will be replaced by Numerical relay. --- Pending,

Status received vide mails dated 04.08.2017 & 18.09.2017 & 31-10-2017 & 12-12-2017.

1. ---- Completed

2. High impedance BBP relay will be replaced by Numerical relay. --- Pending


2) TANTRANSCO informed that Numerical BBP would be provided by April, 2018 ---

Pending


1. --- Complied.

2. High impedance BBP relay will be replaced by Numerical relay. Timeline: April-2018.

TANTRANSCO MAIL DATED 22.05.2018 & 08.06.2018 & 23.07.2018:

2.Numerical BBP relay will be provided. Timeline: Sep-2018.


1. Complied

2.Numerical BBP relay will be provided. Timeline: Sep-2018.

TANTRANSCO Pending58/II/17 Multiple tripping at 230 kV

Alamathy Station

Bus Bar Protection (Zone1) of 230kV Bus-A got operated at

Alamathy Station during fault in 230 kV Alamathy-OPG-1

feeder.

15-09-2016 at 22:14

hrs

1. TANTRANSCO to check the healthiness of BBP relay by

conducting stability test, and take appropriate remedial

action like increasing voltage settings, ensuring the

healthiness of CT’s, using CT’s with similar characteristics

(equal saturation effects & equal winding resistances) etc. at

their 230 kV Alamathy SS.

2. TANTRANSCO to replace the existing high-impedance BBP

relay with its low-impedance/ numerical variant so as to

accommodate variation in CT characteristics at their 230 kV

Alamathy SS.

Annexure-II

Page 29 of 36


Numerical BBP relay to procured. Timeline: Sep-2019.


Numerical BBP relay to be procured. Timeline: Sep-2019.


Numerical BBP relay to be procured. Timeline: Sep-2019.

TANTRANSCO Pending58/II/17 Multiple tripping at 230 kV

Alamathy Station

Bus Bar Protection (Zone1) of 230kV Bus-A got operated at

Alamathy Station during fault in 230 kV Alamathy-OPG-1

feeder.

15-09-2016 at 22:14

hrs

1. TANTRANSCO to check the healthiness of BBP relay by

conducting stability test, and take appropriate remedial

action like increasing voltage settings, ensuring the

healthiness of CT’s, using CT’s with similar characteristics

(equal saturation effects & equal winding resistances) etc. at

their 230 kV Alamathy SS.

2. TANTRANSCO to replace the existing high-impedance BBP

relay with its low-impedance/ numerical variant so as to

accommodate variation in CT characteristics at their 230 kV

Alamathy SS.

Annexure-II

Page 30 of 36

64/1/4 Complete outage of North

Chennai TPS STG-1

26-03-2017

at 23:14hrs


running Unit at NCTPS Stg-1

1. TANTRANSCO to take steps to complete insulator

replacement works on the 230 kV lines owned by them in

NCTPS area within 6 months.

2. TANTRANSCO to take steps to implement A/R on all 230

kV lines emanating from NCTPS-I at the earliest.

TANTRANSCO Status received vide mails dated 04.08.2017 & 18.09.2017 & 31-10-2017:

1. All the Porcelain insulators were replaced with Polymer insulators in 230kV NCTPS-I -

Tondiarpet feeders - 1 & 2.

---- Completed

2. AR will be implemented on all 230kV lines emanating from NCTPS-I. --- Pending


1. Completed

2. The scheme needs modification to enable AR, since AR was not envisaged for this station

during commissioning. AR will be implemented on all 230kV lines emanating from NCTPS-I

within six months. --- Pending


2) TANTRANSCO informed that A/R would be implemented on all 230 kV lines emanating from

NCTPS-I by June, 2018.


1. Complied.



within six months. Timeline:June-2018.

Pending




Timeline:Sep -2018.


1. Complied.



Timeline:Sep -2018.


AR implemented for 4 feeders and remaining lines will be provided with AR subsequently.


1. Complied

2. AR enabled for 3 feeders.


1. Complied

2. AR enabled for 5 feeders.


2. Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem, Tondiarpet &

Alamathy feeder . static relay to be replaced. Timeline - 1 year


Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem, Tondiarpet &

Alamathy feeder . static relay to be replaced. Timeline -Sep 2019


Enabling AR pending for 3 feeders. ( Sriperumpudhur end breaker problem, Tondiarpet &

Alamathy feeder . static relay to be replaced. Timeline -Sep 2019

77/II/9 Multiple trippings at

400 kV Manali Substation

TANTRANSCO to refer the issue of selective tripping of 400

kV side breakers, and non-tripping of 230 kV side breakers

due to operation of Densimeters on low pressure in the

instant case to their OEM, and share OEM’s advice/ remedy

in this regard.

TANTRANSCO mail dated 11.09.2018:

OEM will be referred


TANTRANSCO was asked to update the status.


The issue was referred with OEM & reply awaited

Pending


Thiruvalam Substation

05-10-2018 at 14:32

hrs

Bus-1 got tripped at 230 kV Thiruvalam substation due to

spurious LBB relay (independent) operation of 230kV

Thiruvalam Chittoor line. 230kV Thiruvalam substation was

under single bus operation; hence operation of LBB

protection resulted in tripping of all connected elements

resulting in the complete outage

TANTRANSCO to take steps to implement multi-bus, multi-

zone operation (Double-bus operation) at their 230 kV

Thiruvalam SS by December, 2018.

TANTRANSCO TANTRANSCO MAIL DATED 11-12-2018:

Due to space constraint, the equipments could not be erected.


It was noted that the station was on a single (Main) bus and there was not even transfer bus. In

view of the importance of 230 kV Thiruvalam SS, TANTRANSCO was asked to take steps to

provide dobule-bus operation at their 230 kV Tiruvalam SS.


Feasibility for providing hybrid breaker / shifting of bays will be studied & action will be taken.

Time upto Sep 2019

Pending

Annexure-II

Page 31 of 36

80/II/12 Tripping of all elements

connected to 230 kV Anaikadavu

SS

06-11-2018 at 21:35

Hrs

Triggering incident was failure of R-ph PT of 230 kV

Anaikadavu Bus-1. 230 kV Bus bar protection of bus-1

operated resulting in tripping of all the connected elements.

230 kV Anaikadavu was on single bus operation due to failure

of Bus-2 PT during antecedent conditions.

1) TANTRANSCO to adopt recommended OVR, Stage-I and

OVR, Stage-II protections at their 400 kV Anaikadavu and 400

kV Rasipalayam stations, and to ensure that OVR-I_START

signal is configured for triggering corresponding Event Logger

(EL), and OVR-I_TRIP is configured for triggering

corresponding Event Logger (EL) and Disturbance Recorder

(DR).

2) TANTRANSCO to take steps to restore multi-bus, multi-

zone operation at their 230 kV Anaikadavu SS at the earliest.

TANTRANSCO TANTRANSCO MAIL DATED 23.01.2019 & 19.03.2019:

1……Complied

2.Bus PT is to be supplied by the Turnkey contractor will be replaced by 31.03.2019

Pending


Sriperumbudur station

28-01-2019

at 01:15 Hrs

Failure of ‘R-phase’ HV side Current transformer (CT) of

315MVA 400/230kV ICT-3 at 400kV Sriperumbudur substation

(400kV TANTRANSCO switchyard).

1) TANTRANSCO to ensure proper legends for DR Digital

signals and all required events(including CB status, Type of

protection operated) are captured in Event logger.

2) TANTRANSCO to extend BBP trip from BusBar relay to 86A

(with source-1 DC) in addition to 86B (with source-2 DC), or

to provide Common trip relay 96 with redundant DC supply.

3) TANTRANSCO to inform the action plan with timelines for

providing Numerical BBP at Sriperumbdur SS .

4) TANTRANSCO to check the healthiness of all CT’s in the

stationand submit a report regarding the same to SRPC to

prevent any such occurrence in future.

TANTRANSCO Yet to be informed Pending


Mywadi substation of

TANTRANSCO

04-03-2019 at

11:25hrs

As per the verbal information received, triggering incident

was B-ph bus fault. Bus bar protection of Bus-1 and Bus-2

operated at 230kV Mywadi substation

TANTRANSCO to inform the reason for overflow of DR and

EL of 230kV Anaikadavu-Mywadi line and action plan to

prevent the same in future.

TANTRANSCO Yet to be informed Pending

Annexure-II

Page 32 of 36

KSEB Mail received vide dated 17.01.2017:

1. 110 kV bus bar protection progressing ----Pending

2. Connection of 220kV earth mat and 110 kV plate earthing system completed.---- Completed

3. Redundancy of 110V DC system in progress. Complete independent redundancy is not

practical for the time being. 48 V DC redundancy was already there. ----Pending

4. Instead of stand alone event logger, SCADA system of 110 kV feeder is expected to be

completed by the end of 2017. SCADA system of 220kV side will be taken up after that ----

Pending

KSEB Mail received vide dated 18.09.2017:Status received vide mail dated 12-12-2017:

1. Detailed engineering of the scheme has been completed. Material procurement is in

progress. ---Pending

2.,3. ---- Completed

4. The SOE and DR are available with time stamping from the numerical relays. Hence stand

alone event logger is not necessary ----- Completed

Status received vide mail dated 11-12-2018:

Work has been already tendered. It is expected that purchase process will completed within

three months.


At the time of bid only one bidder participated and the work has been retendered.


Status as on 18.03.2019: Based on the retender, have received two offers from 1) GE T&D Ltd

2)Consyse . The offer from GE T&D is found to be technically acceptable.But the rate received is

above PAC and the request has been submitted to CE ( Trans South ) for sanction to issue

purchase order.

79/I/1 Complete Outage of 220 kV

Idukki Power Station

01-10-2018 at 04:16

hrs

Triggering incident was R-Ph fault in 220kV Idukki-

Kalamassery line-2. R-phase pole of breaker didn’t open at

Idukki end. LBB of Bus-2 operated resulting in tripping of all

connected elements along with running Unit#4 at Idukki and

50MVA station transformer. At the same time, 220kV Idukki

Kalamassery line-1 also got tripped at Idukki end.

Subsequently running Units 1 and 2 also tripped on Governor

oil Low Pressure due to loss of AC supply. This resulted in

complete outage of Idukki PS.

1). KSEBL to check & correct the LBB time setting employed

at their Idukki PH to 200 msec.

2). KSEBL o ensure that DR’s & EL’s of all Protection Relays

(PR’s) at their Idukki PH are configured for recording all

mandated protections & signals.

KSEBL Status received vide mail dated 11-12-2018:

1) Present setting is 180ms.OEM(ABB) suggests that it will give around 200ms delay as it is

having inherent delay is of around 20ms(ie, 180ms +20ms =200ms).With this setting the fault

clearence is found after 220ms.So further revision may be carried out after discussion.

2)Breaker status will be ready only after completing the GOOSE network as part of renovation

of all feeder panels and Idukki first stage units by June 2019 .

Pending

80/II/5 Multiple trippings at 220 kV

Madakathra station

15-10-2018 at 08:57

Hrs

Triggering incident was Y-phase to ground fault in 220kV

Madakathra – Palakkad_KL (Ellapully) line due to flashover of

pilot insulator string. Auto-reclose was successful at

Madakathra end. At the same time bus differential relay Zone-

C mal-operated resulting in tripping of all elements

connected to the bus.

KSEBL to take steps to replace the existing static (high

impedance type) 220 kV BBP with numerical Busbar

protection at their 220 kV Madakathara SS.

KSEBL Status received vide mail dated 11-12-2018:

In progress


Status as on 18.03.2019: Estimate sanctioned by CE(Transmission North ) and have prepared

the technical specifications.Tendering procedures are yet to get started.

Pending


Bhramapuram substation of

KSEB

08-02-2019 at

10:28 hrs

Complete outage of 220kV Brahmapuram SS occurred due to

suspected mal operation of Bus Bar protection.

1) KSEBL to furnish detailed report regarding the healthiness

of BBP operation at 220kV Brahmapuram after testing of the

same on 12th April 2019.

2) KSEBL to submit the action plan regarding

(i) Replacing of the Static High impedance BBP (using CRM

relays) with Numerical BBP.

(ii) Replacement of CRM relays and relays with no

Disturbance recording facilitites.

KSEBL Yet to be informed Pending

Kerala

23-08-2016

at 11:20 hrs

58/I/1

(GD)

PED


Kalamassery Substation

Triggering incident was conductor snapping in 110 kV

Kalamassery- Kaloor feeder

PGCIL (SR-I) & PGCIL (SR-II)

PendingKSEB to take steps to provide the following at their 220/ 110

kV Kalamassery SS:

1. Busbar protection at 110 kV level

2. Connecting 220 kV and 110 kV sides on to a common

earthmat

3. Redundant DC supply for both protection (220 V) and

communication (48 V) applications

4. Stand-alone Event Logger

1. Time-frame?KSEB

Annexure-II

Page 33 of 36

75/II/6Multiple trippings at 400 kV

Raichur-PG SS

03-05-2018

at 18:03 hrs

400 kV RTPS – Raichur PG line-2 tripped due failure of LA in B-

phase at Raichur-PG end. 400 kV RTPS – Raichur PG line-1 &

400 kV Raichur (PG) - Gooty line-1 tripped on operation of

Over-voltage, stage-II protection.

1) PGCIL (SR-I) to set right issues w.r.t. carrier

communication on 400 kV Raichur-PG – RTPS line-2.

2) PGCIL (SR-I) to refer instant trippings to CTU to carry out

Electro Magnetic Transient Phenomena/ Program (EMTP)

analysis, and obtain suitable advice.

3) PGCIL (SR-I) to adopt new OVR-I gradings issue vide SRPC

letter dated 01.05.2018 at their 765/ 400 kV Raichur-PG SS.

PGCIL (SR-I)


1) In 400kV Raichur-RTPS line-1&2 old BPL make PLCC panels were retrofitted with new

PUNCOM make DTPC on 11.08.2018 by availing line S/Ds. presently both channels are

healthy....Completed

2) POWERGRID didn't have EMTP testing provision. Requested CTU to carryout EMTP study. As

discussed, in 75th PCSC Meeting, please advice POSOCO also to carryout EMTP study. ALl DRs in

Comtrade format shared with SRLDC.

3) New OVR gradings issued by SRPC letter dtd 01.05.2018 has been adopted at Raichur SS.....

Completed


2. As informed by PGCIL (SR-I), it was noted that they are yet to receive analysis containing

study results from CTU. In tthis regard, PGCIL (SR-I) was requested to pursue with CTU to get

the job done at the earliest. In case CTU does not have the capability for conducting EMTP

studies, the same may also be informed. --- Pending

Pending

79/III/3

Tripping of 400 kV Vijayawada –

Nellore-AP line-2

11-09-2018 at 15:26

hrs

B-phase to earth fault occurred in line. At vijayawada end

there was zone-2 trip due to non-receipt of carrier which was

in-turn due to PLCC carrier channel fail. Auto-reclose not

attempted.

PGCIL (SR-I) to take steps to disable sending of DT to the

remote end upon any 3-ph trip (esp. DPR, Z2) operation at

Vijayawada end on 400 kV Vijayawada – Nellore-AP line-2,

and to employ it for a select set of protections such as OV

(Stage-I/ Stage-II), LBB, Reactor backup protections. PGCIL (SR-I)


PGCIL-SR1 The recommended changes will be done in next planned S/D.

Pending


Khammam

27-01-2019

at 14:33hrs

ICT-1 at Khammam tripped on operation of IV side non

directional Over-current high set during failure of L.A in

220kV Khammam (Budhidampadu)-Suryapet line-2

PGCIL (SR-I) to immediately take necessary actions to raise

the Highset pick up current setting as per protection

standards since unwarranted tripping of ICT for fault on

220kV line compromises the reliability of Power system. In

any case the transformer protection should not encroach

into protection zone of nearby protection element.

PGCIL (SR-II) Yet to be informed

Pending

73/III/4 Tripping of 400 kV ILFS-

Nagapattinam PS line-1.

28-03-2018 at 10:32

Hrs

R-phase to earth fault had occurred in line. Auto-reclose

attempt could not be validated with submitted DR of

Nagapattinam end.

PGCIL (SR-II) to furnish a report on the reasons for A/R non-

operation, and the remedial action taken to rectify the same.

PGCIL (SR-II) Review Meeting on 21.12.2018:

PGCIL (SR-II) was asked to furnish the status of implementation of the recommendation at the

earliest.

Pending

74/II/20 Tripping of 400/ 220 kV ICT-2 at

Somanahalli

25-04-2018 at

15:23hrs

ICT-2 got tripped due to mal-operation of Buchholtz’s relay. 1). PGCIL (SR-II) to take steps to replace the faulty PNRV’s of

the ICT’s with the proposed reverse flow blocking devices at

the earliest at their Bidadi, Somanahalli, and Pavagada

stations.

2). PGCIL (SR-II) to configure Event Loggers (EL’s) to capture

events msec level at their Somanahalli SS.



earliest.

Pending

75/II/5 Tripping of 400 kV Kolar –

Tiruvalam line

03-05-2018

at 23:40 hrs

Line tripped on operation of Over-Voltage Stg-1 protection at

Kolar and Direct Trip was received at Tiruvalam. It’s Y-ph

voltage was observed to be 5kV higher when compared to R

& B phase voltages at Kolar.

PGCIL (SR-II) to configure Event Loggers of various protection

relays at their Kolar SS to record events with time stamp that

contains all denominations of time, viz., Hours, Minutes,

Seconds, and Milliseconds.



earliest.

Pending

25-07-2018

at 01:53 hrs

29-07-2018

at 02:02 hrs


Bangalore (Somanahalli)

26-10-2018 at 12:10

Hrs

400/220 kV ICT-2 at Bengaluru (Sonamahalli) tripped due to

operation of LV side over flux protection which in turn was

due to suspected 220 kV CVT problem.

PGCIL (SR-II) to configure DR’s & EL’s all protection relays at

their 400/ 220 kV Somanahally SS for all mandated

protections and signals.

PGCIL (SR-II) Yet to be informed Pending

PGCIL (SR-II) Pending77/II/13 Tripping of 400 kV Guttur-

Narendra-PG line-1



earliest.


Guttur. DR & EL not furnished to validate the tripping

PGCIL (SR-II) to check for healthiness of line CVT’s at Guttur

end on 400 kV Guttur – Narendra-PG line-1, and take

appropriate action including their replacement.

Annexure-II

Page 34 of 36

69/I/1 Complete outage of 400kV TPCIL

station

25-10-2017 at 19:33

hrs

400 kV TPCIL-Nellore PS line-1 got tripped from TPCIL end

during fault in 400kV Nellore-Nellore PS line-2. Running units

at TPCIL got tripped due to loss of evacuating line. 400kV

Nellore PG - Nellore PS line-2 and 400kV TPCIL - Nellore PS

line-1 were under shutdown.

TPCIL to configure DEF protection such that it remains in



pickup.

TPCIL Review Meeting on 21.12.2018:

It was noted that no TPCIL representatives had come to attend the meeting

Pending

72/III/5 Tripping of 400 kV HNPCL - K.V.

Kota line

02-02-2018 at 11:46

hrs

Tripped due to R-phase to ground fault. Line did not reclose

at HNPCL.

1. HNPCL to configure DEF protection such that it remains in



pickup.

2. HNPCL to ensure healthiness of A/R scheme implemented

on all 400 kV lines at their station.

HNPCL APTRANSCO maild ated 24.04.2018 & 24.05.2018:

To be attended by HNPCL

HNPCL maild ated 12.05.2018:

1 --- Pending

2.CB close interlock gone to “self-check Fault” state during the AR cycle. Due to that AR gone to

lockout state. Breaker open state CB close interlock should be satisfied condition.Accordingly

the logic has been modiified. ---- Pending


It was noted that no HNPCL representatives had come to attend the meeting

Pending

75/II/2 Tripping of 400kV Hinduja-

K.V.Kota line-2

01-05-2018

at 10:12 hrs

Line-2 tripped on Direct Trip receipt at KV Kota end. At the

same time there was an un-successful auto-reclose attempt

in line-1 due to persistent fault in B-phase.

1) HNPCL to attend PCSC meetings regularly esp. when

tripping events relating to their plant are included in the

Agenda.

2) HNPCL to follow the stipulated File Naming Nomenclature

for naming various tripping files being uploaded in TMS

portal of SRLDC.

3)HNPCL to sort out A/R related issues on 400 kV HNPCL – KV

Kota D/C lines, and put A/R into service from HNPCL end.

4)HNPCL to furnish a detailing tripping report of the event

including remedial measures taken to prevent their

recurrence.

5)HNPCL to configure DR’s & EL’s various protection relays at

the plant to record all mandated protections.

HNPCL Review Meeting on 21.12.2018:

It was noted that no HNPCL representatives had come to attend the the meeting

Pending

78/II/2 Tripping of 400 kV Neyveli

TS2Exp -Pugalur line

01-08-2018

at 11:56 hrs

Triggering incident was failure of R-ph tension insulator

string/ flashover in 400 kV Bus-1 at NLC TS2Exp end. Busbar

protection had operated resulting in tripping of all main

breakers connected to 400kV Bus-1 at Neyveli TS2 Exp. In

400kV NLC TS2Exp - Pugalur line, fault was sensed in Zone-1,

R-N at Pugalur end resulting in a single phase trip. Direct Trip

was received at Pugalur end due to operation of over voltage

Stg-2 at NLC TS2Exp.

1. NLCIL to furnish a report along with a suitable SLD on the

tripping event explaining the observed discrepancies [DPR,

Z1 operation, instantaneous operation of OVR-II operation],

and remedial action taken to attend the same.

2. NLCIL to configure DR’s & EL’s of all protection relays at

their NLC TS-IIExp station for all mandated protections &

signals.

NLCIL Review Meeting on 21.12.2018:

NLCIL was asked to furnish the status of implementation of the recommendation given at the

earliest.

Pending

B-phase CT failure occurred in 230 kV S.P.Koil - MAPS line-1.

Busbar protection got operated at SP.Koil station. All

elements except 230kV Oragadam and 230kV Kalivandapattu

got tripped at 230kV S.P.Koil station. ‘Y’ phase CT and

support insulators also got damaged.

1.MAPS to furnish a detailed report on the tripping of SP Koil

– MAPS lines 1 & 2 at MAPS end with focus on the

correctness of the settings of Main-I & Main-II relays (for

primary & back-up protections) on both the lines.

2.MAPS to take steps to provide down-loading facility for DR

& EL from Main-I & Main-II relays on all 230 kV lines

emanating from MAPS.

3.MAPS, in co-ordination with SP Koil, to carry out PLCC end-

to-end testing, on SP Koil – MAPS lines 1 & 2, and ensure

healthiness of PLCC communication & carrier-aided

protection.

4.MAPS to put in service Auto-Reclosure feature on all four

230 kV lines emanating from MAPS by June, 2016.

02-04-2016 at 17:08

hrs


S.P.Koil Station of TANTRANSCO

PendingNPCIL (MAPS) Status revided vide MAPS mail dated 06.12.2016;

1. The settings given by M/s TANTRANSCO were adopted for Main –I & Main- II relays for both

the lines. The same settings were verified to be same. Subsequently calibrated was done and

no drift was observed. --- Completed

2. From May 2016 onwards, the DR, EL and trip report are being sent by mail to SRLDC,

Bengaluru by MAPS. --- Completed

3. Monthly maintenance of PLCC equipments is being done by M/s TANTRANSCO. At present

PLCC telephone is not working, it is being followed up. --- Completed

4. CVTs are planned to be procured from M/s TANTRANSCO by the end of February 2017 and

A/R will be implemented for all the lines emanating from MAPS by July-2017 as discussed in the

current SRPC meeting on 25/11/2016. --- Pending

Status received vide MAPS mail dated 06.12.2016 & Review Meeting dated 19.12.2017;

The CVTs procurement is in progress and the scheme (A/R) would be implemented before 31-

03-2018.

Status revided vide MAPS mail dated 11.12.2018

The new CVTs were provided in all the three phases (R & B phases, CVTs were replaced and Y

ph CVT was provided) of Line-1,2 & 4. Replacement of CVTs in line-3 is in progress. Each phase

CVT supply was extended to Main 1 & Main -2 relays. Bus PT supply is extended for Sync.Check.

Time Delayed Auto Reclose (TDAR) scheme with Sync. Check, is being worked out and will be

implemented for the four lines, on by one, before 31-03-2019.

Others

Annexure-II

Page 35 of 36

79/II/8 Tripping of 400 kV NLC TS-2

(Exp) – Pugalur line

10-09-2018 at 20:57

hrs

Line tripped on B-N fault. Auto-reclose was not attempted at

Pugalur end due to DT receipt from NLC TS2Exp end. At NLC

TS2Exp end, V>2 trip was observed in DR. Analog voltages

recorded in DR were observed to be less than that required

for O/V Stage-II operation.

NLCIL to furnish a detailed report on tripping event

explaining the observed discrepancies , and proper reasons

for tripping of the line considering both the Main-relays

including remedial action taken w.r.t. healthiness/

replacement of Main protection relays on 400 kV NLC

TS2Exp–Pugalur line.

NLCIL Review Meeting on 21.12.2018:

NLCIL was asked to furnish the status of implementation of the recommendation given at the

earliest.

Pending

80/II/17 Tripping of 400 kV Nellore PS –

SGPL line-1

14-11-2018 at 20:20

hrs

Y- ph to earth fault occurred in line due to snapping of GIS to

Air bushing conductor at SGPL switchyard. The conductor got

grounded such that the fault was being fed by NPS bus and

there was earth fault and broken conductor start at SGPL

end. NPS end got tripped in Zone-2 due to non-receipt of

carrier resulting in a 3-ph trip at NPS. After 500ms, earth fault

occurred at SGPL end resulting in Zone-1 operation and 3

phase trip. A/R was not attempted at SGPL end

SGPL to examine the reasons for no-operation / failure of

Auto-reclosure from their end for the subject tripping, and

furnish an action taken report detailing remedial measures

taken to PCSC forum.

SGPL Yet to be informed Pending

80/III/6 Tripping of 400 kV Neyvelli TS2

(Exp) - Pugalur line

07-11-2018 at 05:50

Hrs

400 kV Neyvelli TS2Exp - Pugalur tripped on

B-phase to ground fault due to DPR, Z1 operation. Auto-

reclose was successful at Pugalur end and the line tripped at

Neyveli TS2Exp end only. Auto-reclose was not attempted at

Neyveli TS-2(Exp) end

NLCIL to furnish a detailed report on the reasons for A/R non-

operation for the subject tripping at their NLCTS2Exp station

including remedial measures taken to PCSC forum.

NLCIL Yet to be informed Pending

82/I/13 Tripping of 400kV Kaiga - Guttur

Ckt-2 &

400/220kV ICT-2 at Kaiga

11-02-2019

at 11:46 hrs

Bus-2 at 400kV Kaiga got de-energized due to LBB operation. NPCIL (KGS) to sort out the LBB issue in 1 months time and

to furnish a detailed report regarding the issue in LBB scheme

ad how the same has been rectified.

NPCIL (KGS) Yet to be informed Pending

82/III/11 Tripping of 400 kV KAIGA -

GUTTUR line- 1

16-02-2019 04:27

hrs

R-phase to earth fault occurred in line resulting in tripping of

line. Auto-reclose not attempted at both ends

NPCIL (KGS) to furnish a report regarding reasons for failure

of A/R at Kaiga end and remedial measures taken.

NPCIL (KGS) Yet to be informed Pending

Annexure-II

Page 36 of 36

Sl.No. Element Name Outage date/time Revival date/time Reason for outage Sender/ Receiver Remedial Measures/ Actions taken Remarks

1 400KV-SINGARENI-SUNDILA-2 17-01-2019/19:22:00MASTER TRIP

RELAY ACTEDTSGENCO/ TSTRANSCO

TSTRANSCO:

Line is under open condition at Sundilla

end. Over Voltage Stage-1 operated at

Sundilla end and DT was sent to

Singareni end.

Pending with

TSGENCO

2 400KV-NELAMANGALA-TALGUPPA-1 01-02-2019/16:56:00 01-02-2019/20:34:00DISTANCE

PROTECTIONKPTCL To-be-discussed

3 400KV/220KV HOODY-ICT-1 03-02-2019/22:25:00 04-02-2019/00:29:00AIR PRESSURE

LOWKPTCL To-be-discussed

4 HVDC 500KV KOLAR_DC Pole 07-02-2019/15:15:00 07-02-2019/16:10:00

Due to agricultural

fire / brick kiln fire

near kolar

PGCIL (SR-II) To-be-discussed

5 400KV-NELAMANGALA-HASSAN-1 11-02-2019/00:05:00TRIPPED ON R-N

FAULTKPTCL/ PGCIL (SR-II) To-be-discussed

6 220KV-KADAKOLA-KANIYAMPETTA 15-02-2019/10:30:00 15-02-2019/18:11:00TRIPPED ON Y-N

FAULTKPTCL/ KSEBL

KSEBL:

No tripping at Kanyambetta end.

Supply failed from Kadakola end. Pending with KPTCL

7 400KV-MEHBOOBNAGAR-RTPS-1 15-02-2019/11:51:00 15-02-2019/12:25:00DT received at

Veltoor endTSTRANSCO/ KPCL

TSTRANSCO:

DT received from Raichur end. Pending with KPCL

8 400KV-NELAMANGALA-TALGUPPA-1 20-02-2019/14:23:00TRIPPED ON Y-N

FAULTKPTCL To-be-discussed

9 400KV-NELAMANGALA-HIRIYUR-1 20-02-2019/11:41:00 20-02-2019/13:20:00TRIPPED ON B

PHASE FAULTKPTCL/ PGCIL (SR-II) To-be-discussed

10 400KV/110KV KAYATHAR-ICT-3 20-02-2019/02:27:00

DUE TO

DIFFERENTIAL

RELAY OPERATION

TANTRANSCO

TANTRANSCO:

R phase HV bushing and R &B phase LV

bushing failure. Internal inspection

planned.

TANTRANSCO:

R phase HV bushing and R &B phase LV

bushing failure. Internal inspection

done repair work is to be taken up.

11 400KV-KARAIKUDI-KAYATHAR-1 20-02-2019/12:21:00 20-02-2019/14:46:00B PHASE TO

GROUND FAULTPGCIL (SR-II)/ TANTRANSCO

TANTRASNCO:

Passing Fault

12 220KV-AMBEWADI-XELDEM 22-02-2019/13:47:00 22-02-2019/21:25:00TRIPPED DUE TO B-

N LINE FAULTKPTCL/ GED To-be-discussed

13 220KV-AMBEWADI-PONDA-2 24-02-2019/14:02:00TRIPPED ON R-N

FAULTKPTCL/ GED To-be-discussed

14 400KV-KOLAR_AC-THIRUVALAM-1 24-02-2019/15:18:00 24-02-2019/15:38:00 FIRE NEAR AREA PGCIL (SR-II) To-be-discussed

15 400KV-NELAMANGALA-HIRIYUR-1 24-02-2019/13:14:00 24-02-2019/14:17:00DISTANCE

PROTECTIONKPTCL/ PGCIL (SR-II) To-be-discussed

Pending Remedial Measures/ Actions taken for the Critical Tripping Incidents (as on 23.04.2019)

Annexure-III

Page 1 of 13

16 400KV-GOOTY-SOMANAHALLI-1 25-02-2019/14:30:00 25-02-2019/14:35:00 transient fault PGCIL (SR-I)/ PGCIL (SR-II)

PGCIL (SR-I): Line A/R successful at

Gooty end on R-N fault; GTY:FL-

266.5KM,FC:1.665KA.

The fault detected at Somanahalli in

Zone-2 and the fault at Gooty end

detected as High resistive fault initially

and after 578 msec & after tripping of

CBs at Somanahalli it was detected as

Zone-2 and carrier send to SMNLY as

per POR scheme.

At Gooty end distance relay operated

correctly and initiated A/R with Zone-

2+Carrier receive and A/R operated

successfully at Gooty end. Gooty end

protection operation is in order.

Pending with PGCIL

(SR-II)

17 400KV-KOLAR_AC-SOMANAHALLI-1 25-02-2019/13:32:00 25-02-2019/13:43:00 transient fault PGCIL (SR-II) To-be-discussed

18400KV-NARNOOR-SRISAILAM_LEFT_BANK-

127-02-2019/16:06:00

TRIPPED ON Y-N

FAULTAPTRANSCO/ TSGENCO

APTRANSCO: Line Patrolling was

carried out on 02/03/2019 and no

visual fault found.

Pending with

TSGENCO

19 400KV-RASIPALYAM-ANAIKADAVU-2 01-03-2019/20:37:00MASTER TRIP

RELAY ACTEDTANTRANSCO

TANTRANSCO: Defective Valiant make

(VCL-TP) protection coupler at

Anaikadavu was isolated from service.

The issue was referred to OEM.

20 220KV-KAIGA-KADRA-1 02-03-2019/10:40:00 22-03-2019/11:16:00TRIPPED ON RELAY

MAL OPERATIONTo-be-discussed

21 220KV-AMBEWADI-XELDEM 02-03-2019/14:38:00 02-03-2019/15:29:00TRIPPED ON C-N

FAULTKPTCL/ GOA To-be-discussed

22 400KV/220KV NELAMANGALA-ICT-2 02-03-2019/13:54:00 02-03-2019/14:05:00TRIPPED ON RELAY

MAL OPERATIONKPTCL To-be-discussed

23 400KV/220KV NARENDRA-ICT-1 02-03-2019/18:21:00 03-03-2019/01:44:00R-PHASE LA

FAILUREPGCIL (SR-II) To-be-discussed

24 220KV-AMBEWADI-XELDEM 02-03-2019/13:46:00 02-03-2019/14:18:00TRIPPED ON C-N

FAULTKPTCL/ GOA To-be-discussed

25 220KV-KAYAMKULAM-PUNNAORA-2 05-03-2019/00:30:00 05-03-2019/02:13:00TRIPPED ON R-N

FAULTNTPC/ KSEB

KSEBL :

Auto reclose successful at Punnapra

end, but CB tripped at NTPC,

Kayamkulam end.

Pending with NTPC

(Kayamkulam)

26 400KV-MYSORE-NELAMANGALA-1 07-03-2019/15:00:00 07-03-2019/15:10:00TRIPPED ON R-N

FAULTPGCIL (SR-II)/ KPTCL To-be-discussed

27 400KV-NELAMANGALA-TALGUPPA-1 07-03-2019/15:00:00 07-03-2019/22:53:00 R-N FAULT KPTCL To-be-discussed

28220KV-KOTHAGUDEM_TPS-

LOWER_SILERU-108-03-2019/15:02:00 08-03-2019/15:21:00

TRIPPED DUE TO B-

N LINE FAULTTSGENCO/ APGENCO

TSGENCO: Line tripped due to Y-N line

(L2-N) fault. Line charged at 15:21Hrs.

Line stood ok.

Pending with

APGENCO

Annexure-III

Page 2 of 13

29 400KV-NELAMANGALA-HIRIYUR-1 08-03-2019/09:57:00 08-03-2019/10:02:00DT received at

Nelemangala endKPTCL/ PGCIL (SR-II) To-be-discussed

30 220KV-AMBEWADI-XELDEM 08-03-2019/13:23:00 08-03-2019/13:46:00 Earth Fault KPTCL/ GED To-be-discussed

31 400KV-NELAMANGALA-TALGUPPA-1 08-03-2019/16:46:00 Y-N FAULT KPTCL To-be-discussed

32 220KV-KUNDARA-KAYAMKULAM-1 09-03-2019/12:44:00 09-03-2019/14:12:00 DT RECEIVED KSEBL/ NTPC (KYKLM)

KSEBL: 2KYKD tripped only at

Kayamkulam Substation. No tripping at

Kundara Substation End.

Pending with NTPC

(Kayamkulam)

33 230KV-TIRUNELVELI-VEERANAM-1 11-03-2019/00:55:00 Y PHASE CT BLAST TANTRANSCOCT is to be replaced in Tirunelveli

feeder 1 at Veeranam.

34 230KV-TIRUNELVELI-VEERANAM-2 11-03-2019/00:55:00 11-03-2019/02:48:00 Y PHASE CT BLAST TANTRANSCOTANTRANSCO: There is no fault in the

Veernam - Tirunelveli feeder-2

35 400KV-KAIGA-GUTTUR-2 11-03-2019/01:49:00TRIPPED ON R-N

FAULTNPCIL (KGS)/ KPTCL

NPCIL (KGS) informed that line tripped

on R-N fault due to DPR operation. LBB

Scheme is being revised. The scheme is

reviewed by designer and will be

implemented during next available

Kaiga-Guttur line-2 shutdown.

36 400KV-SINGARENI-SUNDILA-1 12-03-2019/17:03:00

BUS BAR

PROTECTION

OPERATED

TSGENCO/ TSTRANSCO

TSTRANSCO : the line tripped on Direct

Trip received indications in Main-2,

P444 relay at Ramadugu end only due

to momentary DC earth leakage.

Spurious DT signal received to Main-2,

P444 relay as OPTO signals were

configured with 24V. The OPTO signal is

now revised to 220V DC by NR service

engineer.

37 400KV-SINGARENI-SUNDILA-2 12-03-2019/17:03:00

BUS BAR

PROTECTION

OPERATED

TSGENCO/ TSTRANSCO

TSTRANSCO : the line tripped on Direct

Trip received indications in Main-2,

P444 relay at Ramadugu end only due

to momentary DC earth leakage.

Spurious DT signal received to Main-2,

P444 relay as OPTO signals were

configured with 24V. The OPTO signal is

now revised to 220V DC by NR service

engineer.

38 HVDC 500KV KOLAR_DC Pole 12-03-2019/13:02:00 12-03-2019/13:45:00 transient fault PGCIL (SR-II) To-be-discussed

39 400KV-VTPS_IV-SURYAPET-2 14-03-2019/13:52:00 14-03-2019/14:52:00TRIPPED ON R-N

FAULTAPGENCO/ TSTRANSCO To-be-discussed

40 220KV-AMBEWADI-XELDEM 15-03-2019/12:23:00 15-03-2019/17:09:00Tripped on Y-B

FaultKPTCL/ GED To-be-discussed

41 400KV-NELAMANGALA-HASSAN-1 16-03-2019/21:06:00TRIPPED ON Y-N


42 400KV-BPS-TUMKUR-2 17-03-2019/16:17:00 R-Y FAULT KPTCL To-be-discussed

43 400KV-BPS-YTPS-1 17-03-2019/16:17:00 R-Y FAULT KPTCL/ KPCL To-be-discussed

Annexure-III

Page 3 of 13

44 400KV-NELAMANGALA-TALGUPPA-1 18-03-2019/15:31:00TRIPPED ON B-N


45 400KV-NELAMANGALA-HASSAN-1 18-03-2019/14:49:00 R-N FAULT KPTCL/ PGCIL (SR-II) To-be-discussed

46 400KV-BPS-YTPS-2 18-03-2019/16:17:00 18-03-2019/23:59:00 R-Y FAULT KPTCL/ KPCL To-be-discussed

47 400KV-NELAMANGALA-TALGUPPA-1 19-03-2019/17:39:00TRIPPED ON R-N


48 220KV-AMBEWADI-PONDA-2 20-03-2019/13:14:00 20-03-2019/13:56:00Triiped on R-B


49 220KV-UDUMALPET_TN-IDDUKKI-1 21-03-2019/06:05:00 21-03-2019/11:10:00INSULATOR FLASH

OVERTANTRANSCO/ KSEBL

KSEBL: Z#2,B phase to Ground .Reason

for tripping . Reason for tripping due to

conductor decapping & tension pont

disc 14 flash over at Udumelpet area

Pending with

TANTRANSCO

50 400KV/220KV GAJWEL-ICT-4 21-03-2019/9 10:13:00 21-03-2019/13:38:00 PRV OPERATED TSTRANSCO To-be-discussed


LOWER_SILERU-123-03-2019/11:27:00 23-03-2019/11:52:00

TRIPPED ON R-N

FAULTTSGENCO/ APGENCO To-be-discussed

52 400KV-BIDADI-TUMKUR-2 23-03-2019/14:47:00 23-03-2019/17:00:00TRIPPED ON R-Y

FAULTPGCIL (SR-II) To-be-discussed


LOWER_SILERU-124-03-2019/12:55:00 24-03-2019/15:52:00

TRIPPED ON Y-N

FAULTTSGENCO/ APGENCO To-be-discussed

54 400KV-NELLORE_AP-VTPS_IV-1 24-03-2019/12:46:00 24-03-2019/12:58:00TRIPPED ON Y-N

FAULTAPTRANSCO/ APGENCO

APTRANSCO: "Y-Phase to ground , Zone-

1 Fault and AR Successful at Manubolu

end.

Protection operation found in order."

Pending with

APGENCO

55 400KV-NELAMANGALA-TALGUPPA-1 28-03-2019/17:38:00TRIPPED ON R-N


56 400KV-PALAVADI-MTPS_ST_III-1 29-03-2019/06:52:00

H/T DUE TO SF6

GAS PRESSURE

LOW

PGCIL (SR-II)/ TANGEDCO To-be-discussed

57 400KV/230KV SALEM_TN-ICT-1 29-03-2019/18:14:00 29-03-2019/18:37:00HIGH WINDING

TEMPERATURETANTRANSCO To-be-discussed

58 220KV-AMBEWADI-XELDEM 30-03-2019/21:18:00 30-03-2019/22:32:00Tripped on Y-B


59 400KV-VTPS_IV-SURYAPET-2 31-03-2019/13:42:00 31-03-2019/16:41:00TRIPPED ON B-N


60 400KV-VTPS_IV-SURYAPET-1 31-03-2019/13:42:00TRIPPED ON B-N


Annexure-III

Page 4 of 13

61 400KV-RAICHUR_PG-RTPS-2 03-04-2019/19:37:00 03-04-2019/20:18:00TRIPPED ON B-N

FAULTPGCIL(SR-I)/ KPCL

PGCIL (SR-I): Tripped on B-N Fault,Fault

Current: 22.989 kA, Dist: 12.804km

(57.520%) from raichur end. 23.01Kms

& FC:8.36kA from RTPS end.

Patrolling carriedout no abnormality

found. During the tripping heavy wind

and thunders were reported at that

locations.

Pending with KPTCL

Status of operation of

A/R in the line ?

62 400KV-RTPS-BTPS-1 03-04-2019/12:36:00 03-04-2019/19:02:00TRIPPED ON Y-N

FAULTKPCL To-be-discussed

63 400KV-MAMIDAPALLI-DINDI-1 05-04-2019/20:02:00TRIPPED DUE TO

R0N FAULTTSTRANSCO To-be-discussed

64 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 05-04-2019/12:55:00 05-04-2019/19:53:00TRIPPED ON Y-N

FAULTTSGENCO/ APTRANSCO

TSGENCO: ICT-2 was not tripped, only

220KV line-4 associated with ICT-2 was

tripped from Malayalapally end, with

400KV bus-2 fault at RSTPS end. From

RSTPS end Line was in charged

condition.

Pending with

APTRANSCO

65 220KV-AMBEWADI-PONDA-2 05-04-2019/01:11:00TRIPPED ON Y-N


66 400KV/220KV RAMAGUNDAM-ICT-2 05-04-2019/19:56:00 05-04-2019/23:26:00

BUS BAR

PROTECTION

OPERATED

NTPC To-be-discussed

67 400KV-NELAMANGALA-HASSAN-1 06-04-2019/17:32:00TRIPPED ON Y-N


68 400KV-MAMIDAPALLI-DINDI-1 06-04-2019/17:37:00 06-04-2019/20:53:00

R Phase distance

protection

operated

TSTRANSCO To-be-discussed

69 400KV-SRISAILAM_LEFT_BANK-DINDI-1 06-04-2019/17:39:00TRIPPED ON R-N

FAULTTSGENCO/ TSTRANSCO To-be-discussed

70400KV-NARNOOR-SRISAILAM_LEFT_BANK-

108-04-2019/16:11:00 08-04-2019/19:45:00

TRIPPED ON R-N

FAULTAPTRANSCO/ TSGENCO To-be-discussed

71 400KV-NARNOOR-JAMMALAMADUGU-1 08-04-2019/16:12:00 08-04-2019/17:08:00TRIPPED ON B-N

FAULTAPTRANSCO To-be-discussed

72 400KV-NARNOOR-JAMMALAMADUGU-2 08-04-2019/16:12:00 08-04-2019/17:13:00TRIPPED ON B-N


73400KV-SRISAILAM_LEFT_BANK-

SATTENPALLI08-04-2019/15:05:00

TRIPPED ON R-N

FAULTTSGENCO/ APTRANSCO To-be-discussed

74 400KV-KAIGA-GUTTUR-1 08-04-2019/16:50:00TRIPPED ON R-Y

FAULTNPCIL / KPTCL To-be-discussed

75 400KV-GUTTUR-HIRIYUR-1 08-04-2019/14:28:00 08-04-2019/14:57:00TRIPPED ON Y-N


76 400KV-HOSUR-SALEM-2 08-04-2019/17:55:00 08-04-2019/20:18:00Triiped on R-B

FaultPGCIL (SR-I) To-be-discussed

Annexure-III

Page 5 of 13

77 765KV-RAICHUR_PG-SHOLAPUR-2 08-04-2019/11:16:00 08-04-2019/11:41:00TRIPPED ON R-N

FAULTPGCIL (SR-I)

PGCIL (SR-I): Line tripped on R-N

Fault(RCN End : FC-4.341Km, FD-

126.187Km . Protection operation is in

olrder. Solaphur End : FC-5.12KA FD-

86.701). Line belonga to M/s RSTCPL .

Status of A/ R in line?

78 220KV-KADAKOLA-KANIYAMPETTA 08-04-2019/22:48:00 09-04-2019/01:10:00HEAVY WIND AND

LIGHTETINGKPTCL/ KSEB

KSEBL: Not tripped at Kaniyambetta

end as the feeder was radial from

Kadakola and CB open at Areekode

end.

Pending with KPTCL

79 220KV-SHORNUR-AREACODE-1 10-04-2019/23:06:00 11-04-2019/00:21:00

BUS BAR

PROTECTION

OPERATED

KSEB

KSEBL : KSEBL: High impedance Bus bar

protection operatrd at Areekode 220

KV substation and all three zones

tripped. But BBP trip relays acted only

in 2KZAR1, 2KZAR 2 and 2KZAR 3.

2ARKN and 160 Mva Transformer under

switched off condition prior to the

fault. 220 KV feeders 2SHAR and

2MDAR tripped at both ends on

distance protection. Other feeders

switched off from Areekode. The non

tripping of BBP trip relays under

investigation(Detailed report will be

submitting soon) . The old High

Impedance BBP is under replacement

by Low impedance GE make panel. PO

issued .

80 400KV-SRISAILAM_LEFT_BANK-DINDI-1 10-04-2019/18:13:00 10-04-2019/19:58:00TRIPPED ON R-N

FAULTTSGENCO/ TSTRANSCO To-be-discussed

81 400KV-BPS-YTPS-2 10-04-2019/19:40:00TRIPPED ON R-N

FAULTKPTCL/ KPCL To-be-discussed

Annexure-III

Page 6 of 13

82 220KV-MALAPARAMBA-AREACODE-1 10-04-2019/23:06:00 11-04-2019/00:11:00

BUS BAR

PROTECTION

OPERATED

KSEB

















issued .

83 220KV-MADAKATHARA-AREACODE-1 10-04-2019/23:06:00 10-04-2019/23:59:00

BUS BAR

PROTECTION

OPERATED

KSEB

















issued .

Annexure-III

Page 7 of 13

84 220KV-KOZHIKODE-AREACODE-1 10-04-2019/23:06:00 10-04-2019/23:42:00

BUS BAR

PROTECTION

OPERATED

KSEB

















issued .

85 220KV-AREACODE-NALLALAM-2 10-04-2019/23:06:00 10-04-2019/23:45:00

BUS BAR

PROTECTION

OPERATED

KSEB

















issued .

Annexure-III

Page 8 of 13

86 220KV-AREACODE-NALLALAM-1 10-04-2019/23:06:00 10-04-2019/23:44:00

BUS BAR

PROTECTION

OPERATED

KSEB

















issued .


BUS BAR

PROTECTION

OPERATED

KSEB

















issued .

Annexure-III

Page 9 of 13

88 220KV-AREACODE-KANHIRODE-1 10-04-2019/23:06:00 10-04-2019/23:52:00

BUS BAR

PROTECTION

OPERATED

KSEB

















issued .


BUS BAR

PROTECTION

OPERATED

KSEB

















issued .

90 400KV-MUNIRABAD-RTPS-1 10-04-2019/15:52:00 10-04-2019/16:05:00 DT RECEIVED PGCIL (SR-I)/ KPCL

PGCIL (SR-I): Line tripped on DT receipt

from RTPS end. While availing the line

S/D on RTPS-Velatoor line during the

opening of CBs of RTPS-Velatoor line at

RTPS due to wrong configuration DT

send to Munirabad end from RTPS.

Protection belongs to M/s KPCL.

Annexure-III

Page 10 of 13

91 220KV-AREACODE-VADAKARA-1 10-04-2019/23:06:00 11-04-2019/00:01:00

BUS BAR

PROTECTION

OPERATED

KSEB

















issued .

92 220KV-SULURPET-GUMMIDIPOONDI-1 11-04-2019/16:05:00 11-04-2019/17:01:00TRIPPED DUE TO B-

N LINE FAULTTANTRANSCO To-be-discussed

93 400KV-TALARCHEVU-URAVAKONDA-2 11-04-2019/20:11:00TRIPPED ON B-N


94400KV-TALARCHEVU-JAMMALAMADUGU-

111-04-2019/20:11:00 11-04-2019/22:00:00

TRIPPED ON B-N


95 400KV-HINDUJA-KV_KOTA-2 11-04-2019/09:40:00 11-04-2019/11:08:00TRIPPED ON Y-N

FAULTHNPCL/ APTRANSCO To-be-discussed

96 220KV-CHITTOOR_AP-THIRUVALAM_TN-1 11-04-2019/16:42:00 11-04-2019/22:28:00TRIPPED ON Y-N

FAULTAPTRANSCO/ TANTRANSCO To-be-discussed

97 220KV-CHITTOOR_AP-THIRUVALAM_TN-1 11-04-2019/10:59:00 11-04-2019/16:11:00TRIPPED ON B-N

FAULTAPTRANSCO/ TANTRANSCO To-be-discussed

98 400KV-VALLUR-ALAMATHY-1 11-04-2019/02:45:00 11-04-2019/04:45:00TRIPPED ON Y-N

FAULTNTECL/ TANTRANSCO To-be-discussed


SATTENPALLI11-04-2019/14:28:00

TRIPPED ON Y-N


100 400KV-NARNOOR-JAMMALAMADUGU-2 12-04-2019/10:13:00 12-04-2019/16:26:00TRIPPED ON B

PHASE FAULTAPTRANSCO To-be-discussed

101 400KV-KHAMMAM-ASUPAKA-1 13-04-2019/13:26:00 13-04-2019/18:29:00TRIPPED ON B-N

FAULTPGCIL (SR-I)/ TSTRANSCO To-be-discussed

102 400KV-URAVAKONDA-MEHBOOBNAGAR-1 13-04-2019/18:36:00TRIPPED ON Y-N

FAULTAPTRANSCO/ TSTRANSCO To-be-discussed

103 400KV-KHAMMAM-ASUPAKA-1 14-04-2019/13:14:00 14-04-2019/19:35:00TRIPPED ON B-N

FAULTPGCIL (SR-I)/ TSTRANSCO To-be-discussed

104 400KV-SIMHADRI_STG2-VEMAGIRI_AP-1 15-04-2019/17:58:00 15-04-2019/23:10:00 LA FAILURE NTPC/ APTRANSCO To-be-discussed

105 400KV-SURYAPET-JULURUPADU-2 15-04-2019/06:49:00TRIPPED ON B

PHASE FAULTTSTRANSCO To-be-discussed

Annexure-III

Page 11 of 13

106 400KV-CHITTOOR-KRISHNAPATNAM-1 15-04-2019/16:36:00 15-04-2019/17:03:00

H/T DUE TO SF6

GAS PRESSURE

LOW

APTRANSCO To-be-discussed

107 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 15-04-2019/14:01:00 15-04-2019/22:03:00TRIPPED DUE TO B-

N LINE FAULTTSGENCO/ APTRANSCO To-be-discussed

108 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 15-04-2019/13:20:00 15-04-2019/14:00:00TRIPPED ON Y-N


109 132KV-KONAJE-MANJESWAR-1 15-04-2019/16:36:00 15-04-2019/16:55:00

Tripped on over

current (Due to

traction load)

KPTCL To-be-discussed

110 400KV-VTPS_IV-SURYAPET-2 15-04-2019/14:24:00 15-04-2019/15:19:00TRIPPED ON Y-N


111 220KV-KOTHAGUDEM_TPS-NUNNA_AP-1 16-04-2019/14:04:00 16-04-2019/14:30:00TRIPPED ON B-N


112 400KV-NARNOOR-GHANI-2 17-04-2019/16:53:00 17-04-2019/21:06:00Tripped on R-B

FaultAPTRANSCO To-be-discussed

113 400KV-GOOTY-SOMANAHALLI-1 FSC 17-04-2019/11:16:00

To reduce power

flow of attend near

Somanhalli end.


114 765KV/440KV KURNOOL_PG-ICT-2 17-04-2019/16:53:00 17-04-2019/17:11:00

TRIPPED ON

BUCCHOLZ RELAY

OPERATION

PGCIL (SR-I) To-be-discussed

115 400KV-RAMAGUNDAM-WARANGAL-1 17-04-2019/16:49:00TRIPPED ON R-N

FAULTPGCIL(SR-I)/ NTPC To-be-discussed

116 400KV-MYSORE-KOZHIKODE-1 17-04-2019/17:18:00 17-04-2019/17:36:00TRIPPED ON B-N

FAULTPGCIL (SR-II) To-be-discussed

117 400KV-MALKARAM-RAMAGUNDAM-1 17-04-2019/15:59:00 17-04-2019/16:40:00TRIPPED ON B-N

FAULTTSTRANSCO/ NTPC To-be-discussed

118 400KV-RAYALSEEMA TPP-KALIKIRI-1 17-04-2019/15:06:00 17-04-2019/22:00:00TRIPPED ON R-N

FAULTAPGENCO/ APTRANSCO To-be-discussed

119 220KV-YERRAANDAHALLI-HOSUR_TN-1 17-04-2019/15:23:00 17-04-2019/21:28:00TRIPPED ON B-N

FAULTKPTCL/ TANTRANSCO To-be-discussed

120220KV-NAGARJUNASAGAR_AP-

NAGARJUNASAGAR17-04-2019/15:54:00

TRIPPED ON B-N

FAULTAPTRANSCO/ TSTRANSCO To-be-discussed

121220KV-NAGARJUNASAGAR_AP-

NAGARJUNASAGAR17-04-2019/15:54:00 17-04-2019/17:08:00

Tripped on Y-B

FaultAPTRANSCO/ TSTRANSCO To-be-discussed

122 400KV-GHANAPUR-RAMAGUNDAM-4 17-04-2019/16:13:00 17-04-2019/17:28:00Tripped on Y-B

FaultPGCIL(SR-I)/ NTPC To-be-discussed

123 400KV/220KV MADAKKATHARA-ICT-3 18-04-2019/21:20:00 18-04-2019/23:18:00

BUS BAR

PROTECTION

OPERATED

KSEBL To-be-discussed

124 400KV-DONI-GUTTUR-1 18-04-2019/18:59:00 CB FLASHOVER KPTCL To-be-discussed

125 400KV-MAMIDAPALLI-KHAMMAM-2 18-04-2019/17:46:00DISTANCE

PROTECTIONTSTRANSCO/ PGCIL (SR-I) To-be-discussed

126400KV-GHANAPUR-MAHESHWARAM_PG-

119-04-2019/16:59:00 19-04-2019/17:44:00

TRIPPED ON B-N

FAULTPGCIL (SR-I) To-be-discussed

Annexure-III

Page 12 of 13

127 400KV-KAYATHAR-KANARPATTI-1 20-04-2019/15:23:00 20-04-2019/16:03:00DT Recieved at

Kanarpaty endTANTRANSCO To-be-discussed

128 765KV-SRIKAKULAM-VEMAGIRI_PG-1 20-04-2019/17:30:00 20-04-2019/17:35:00TRIPPED ON B-N

FAULTPGCIL (SR-I) To-be-discussed

129 400KV-KAYATHAR-KANARPATTI-2 20-04-2019/15:23:00 20-04-2019/16:23:00DT Recieved at

Kanarpaty endTANTRANSCO To-be-discussed

130 400KV-PALAKKAD-TRICHUR-1 20-04-2019/13:09:00 20-04-2019/13:30:00

TRIPPED ON

SINGLE PHASE TO

GND FAULT


131 400KV-KHAMMAM-WARANGAL-1 20-04-2019/14:45:00 20-04-2019/14:56:00

TRIPPED ON

SINGLE PHASE TO

GND FAULT

PGCIL (SR-I) To-be-discussed


SATTENPALLI20-04-2019/16:33:00

TRIPPED ON

SINGLE PHASE TO

GND FAULT

TSGENCO/ APTRANSCO To-be-discussed

133 400KV-MARADAM-KALPAKKA-2 20-04-2019/19:00:00 20-04-2019/23:48:00

TRIPPED ON

SINGLE PHASE TO

GND FAULT


134 220KV-KADAKOLA-KANIYAMPETTA 20-04-2019/20:21:00 20-04-2019/20:41:00TRIPPED DUE TO B-

N LINE FAULTKPTCL/ KSEBL To-be-discussed

135 220KV-UDUMALPET_TN-IDDUKKI-1 20-04-2019/20:27:00 20-04-2019/23:15:00RELAY

MALOPERATIONTANTRANSCO/ KSEBL To-be-discussed

136400KV-MAHESHWARAM_TG-

SHANKARAPALLI20-04-2019/16:51:00

TRIPPED ON Y-N

FAULTTSTRANSCO To-be-discussed

137 400KV-NARNOOR-GHANI-1 21-04-2019/18:13:00TRIPPED ON B

PHASE FAULTAPTRANSCO To-be-discussed

138 400KV/220KV GHANI-ICT-1 21-04-2019/18:13:00 21-04-2019/21:12:00

H/T DUE TO

INSULATOR

TRACKING


139 400KV/220KV MEHBOOBNAGAR-ICT-3 22-04-2019/16:23:00 22-04-2019/20:43:00RESTRICTED EARTH

FAULTTSTRANSCO To-be-discussed

140 400KV-NCTPS_STAGE_II-VALLUR-2 22-04-2019/00:38:00INSULATOR

TRACKINGTANGEDCO/ NTECL To-be-discussed

141 400KV-HINDUJA-KV_KOTA-2 22-04-2019/20:48:00TRIPPED ON R-N

FAULTHNPCL/ APTRANSCO To-be-discussed

142 400KV/220KV DICHPALLY-ICT-2 22-04-2019/17:22:00 22-04-2019/20:20:00RESTRICTED EARTH


143 400KV/220KV DICHPALLY-ICT-3 22-04-2019/17:22:00 22-04-2019/20:26:00RESTRICTED EARTH


Annexure-III

Page 13 of 13

SL.NO SS NAME OWNERSLD prepared by

PRDC

Utilities

responded to

SLDs

finalized or not

1 DONKARAYI PH_GS APGENCO yes

2

HAMPI PH_GS APGENCO

Basic SLD is yes.

Protection is not

modeled as

Protection SLD is

not available.

3 LOWER SILERU PH_GS APGENCO yes

4 MACHKUND PH_GS APGENCO yes

5 NAGARAJUNASAGAR TAILPOND PH_GS APGENCO yes

6 NAGARJUNASAGAR RIGHT CANAL PH_GS APGENCO yes

7 NTTPS_GS APGENCO yes (2 drawings)

8 RTPP APGENCO yes (2 drawings)

9 SDSTPS_GS APGENCO yes

10 SRISAILAM RIGHT BANK PH SS APGENCO yes

11 TUNGA BHADRA PH_GS APGENCO yes

12 UPPER SILERU PH_GS APGENCO yes

13 PENNA AHOBILAM_GS APGENCO yes

14 SRISAILAM RIGHT BANK PH_GS APGENCO yes

15 GODAVARI GAS PP JEGURUPAD PHASE-1_GS APEPDL yes

16 GALIVEDU PHASE-1 APSPCL yes

17 GALIVEDU PHASE-2 APSPCL yes

18 NP KUNTA APSPCL yes

19 VIJESWARAM STAGE-1_GS APGPCL yes yes

20 VIJESWARAM STAGE-2_GS APGPCL yes yes

21 ANANTAPUR APTRANSCO yes

22 ANRAK APTRANSCO yes

23 AP CARBIDES APTRANSCO yes

24 BHIMADOLE APTRANSCO yes

25 BILAKALAGUDURU APTRANSCO yes

26 BOBBILI GROWTH CENTER APTRANSCO yes

27 BOKSAMPALLI APTRANSCO yes

28 BOMMURU APTRANSCO yes

29 BORAMPALLI APTRANSCO yes

30 BOYAREDDY PALLI APTRANSCO yes

31 BRAHMADEVA PALEM APTRANSCO yes

32 BRAHMANAKOTKURU APTRANSCO yes

33 BRANDIX APTRANSCO yes

34 CHAKRAYAPETA APTRANSCO yes

35 CHILLAKALLU APTRANSCO yes

36 CHINAKAMPALLI APTRANSCO yes

37 CHITTOOR SS APTRANSCO yes

38 DAIRY FARM APTRANSCO yes

39 DHONE APTRANSCO yes

40 DUVVA APTRANSCO yes

41 GADDAVARIPALLI APTRANSCO yes

42 GAJUWAKA APTRANSCO yes

43 GAMESHA RENEWABLE Pvt Ltd_GS APTRANSCO yes

44 GANGAVARAM APTRANSCO yes

45 GARIVIDI APTRANSCO yes

46 GHANI APTRANSCO yes

47 GODDUMARI APTRANSCO yes

48 GOLLAPURAM APTRANSCO yes

49 GOOTY APTRANSCO yes yes

50 GOOTY SWS APTRANSCO yes

51 GOOTY(RTSS) APTRANSCO yes

52 GUDIVADA APTRANSCO yes

53 GUNADALA APTRANSCO yes

54 HINDUPUR APTRANSCO yes

55 JAMMALAMADUGU 400KV APTRANSCO yes

56 KADAPA SS APTRANSCO yes yes

57 KAKINADA APTRANSCO yes

58 KALAPAKA APTRANSCO yes

59 KALIKIRI 400KV APTRANSCO yes

60 KALIKIRI SS APTRANSCO yes

61 KALYANDURGA APTRANSCO yes

62 KAMAVARAPOKOTA_220 APTRANSCO yes

63 KAMAVARAPOKOTA_400 APTRANSCO yes

64 KAMBALAPADU APTRANSCO yes

65 KODURU APTRANSCO yes

66 KONDAPALLI APTRANSCO yes

67 KONDAPURAM APTRANSCO yes

68 KRISHNAGIRI APTRANSCO yes

69 KUPPAM APTRANSCO yes

70 LAKKASAGARAM APTRANSCO yes

71 MADANAPALLE APTRANSCO yes

72 MAHADEVA MANGALAM APTRANSCO yes

73 MALYALA APTRANSCO yes

Status of Confirmation of Orderliness of Protection SLD's of Andhra Pradesh

Annexure-IV

Page 1 of 18

74 MANUBOLU_400kV APTRANSCO yes

75 MARADAM APTRANSCO yes

76 MARKAPUR APTRANSCO yes

77 MUCHUMARI APTRANSCO yes

78 MYDUKUR APTRANSCO yes

79 MYTHRA VAYU Pvt Ltd_GS APTRANSCO yes

80 NAGARI APTRANSCO yes

81 NANDYALA APTRANSCO yes

82 NANSURALLA APTRANSCO yes

83 NARASARAOPET APTRANSCO yes

84 NARNOOR APTRANSCO yes

85 NELLORE APTRANSCO yes yes

86 NIDADAVOLU APTRANSCO yes

87 NUNNA APTRANSCO yes

88 ONGOLE APTRANSCO yes

89 PALAMANERU APTRANSCO yes

90 PALLANTLA APTRANSCO yes

91 PARUCHUR APTRANSCO yes

92 PARWADA APTRANSCO yes

93 PENDURTHY APTRANSCO yes

94 PODILI APTRANSCO yes

95 PORUMAMILLA APTRANSCO yes

96 PULIVENDULA APTRANSCO yes

97 RACHAGUNNERI APTRANSCO yes

98 RAJAMPETA APTRANSCO yes

99 RAMAGIRI APTRANSCO yes

100 RAMPOCHADAVARAM APTRANSCO yes

101 REGULAPADU APTRANSCO yes

102 RENIGUNTA APTRANSCO yes

103 RENTACHINTALA APTRANSCO yes

104 SAMALKOT APTRANSCO yes

105 SATTENAPALLY APTRANSCO yes

106 SETTIPALLY APTRANSCO yes

107 SHAPURAM APTRANSCO yes

108 SOMAYAJULAPPALLY APTRANSCO yes

109 SUBBARAYUNIPALLI APTRANSCO yes

110 SULURPETTA APTRANSCO yes

111 TADIKONDA APTRANSCO yes

112 TADIPADRI APTRANSCO yes

113 TALLEPALLY APTRANSCO yes

114 TEKKALI APTRANSCO yes

115 THIMMAPURAM APTRANSCO yes

116 THIMMAPURAM CHITTOOR APTRANSCO yes

117 UNDI APTRANSCO yes

118 URAVAKONDA APTRANSCO yes

119 VAJRAKARUR APTRANSCO yes

120 VEMAGIRI APTRANSCO yes

121 VIZAG SWITCHING STATION APTRANSCO yes

122 YELLANUR APTRANSCO yes

123 YERRAGUNTLA APTRANSCO yes

124 GOOTHY(PGCIL) PGCIL (SR-I) yes

125 KADAPA PGCIL PGCIL (SR-I) yes

126 KURNOOL PGCIL PGCIL (SR-I) yes yes

127 MANUBOLU_PG_400kV PGCIL (SR-I) yes

128 MANUBOLU_PG_765kV PGCIL (SR-I) yes

129 NP KUNTA PGCIL PGCIL (SR-I) yes yes

130 SRIKAKULAM_PG PGCIL (SR-I) yes yes

131 VEMAGIRI PG PGCIL (SR-I) yes yes

132 VIJAYAWADA_PG PGCIL (SR-I) yes yes

133 VISAKHAPATNAM_PGCIL PGCIL (SR-I) yes yes

134 KADAPA GIS PGCIL (SR-I) Visited recently

135NP KUNTA SOLAR NTPC

Modeled in GUI

17

136 NTPC SIMHADRI_GS NTPC yes

137 HINDUJA NATIONAL POWER LTD(HNPCL)_GS HNPCL yes Yes

138 LANCO_GS LANCO yes yes

139SEIL_GS

SEMCORP ENERGY INDIA

LIMIDEDyes

140SGIL_GS

SEMCORP GAYATRI POWER

LIMIDEDyes

141 ANIMALA_WIND GREENKO yes

142 ANRAK ALUMINIUM LTD ANRAK ALUMINIUM LTD yes

143AXIS WIND FARMS

AXIS ENERGY VENTURE IND

PVT.LTDyes

144AZURE POWER INFASTRUTURE PVT LTD

AZURE POWER INFASTRUTURE

PVT LTDyes

145 ECOREN WIND ENERGY ECOREN ENERGY IND PVT LTD yes

146 ECORON ENERGY INDIA PVT LTD RENEW POWER LTD yes

147 ELLUTLA(SUZLON)_GS RENEW POWER LTD yes

148 GAMESA WIND_GS GAMESA yes

149 GANI SOLAR PARKS 1_GS GREENKO yes

Annexure-IV

Page 2 of 18

150 GANI SOLAR PARKS 2_GS GREENKO yes

151 GANI SOLAR PARKS 3_GS ADANI yes

152 GANI SOLAR PARKS 4_GS ADANI yes

153GIRIJA ALLOY & POWER INDIA LTD_GS

GIRIJA ALLOY & POWER INDIA

LTDyes

154 GMR BARGE MOUNTED_GS GMR ENERGY yes

155 GMR VEMAGIRI_GS GMR ENERGY yes

156 GREENKO ENERGIES PRIVATE LTD_GS GREENKO yes

157 GVK GAUTAMI_GS GVK INDUSTRIES LTD yes

158 GVK JEGURUPAD PHASE-2_GS GVK INDUSTRIES LTD yes

159 HELIOUS INFRATECH PVT LTD_GS HELIOUS INFRATECH PVT LTD yes

160 HERO FUTURE ENERGIES_GS HERO FUTURE ENERGIES yes

161

INDIAN RAILWAY TRACTION_GOOTY INDIAN RAILWAY

SLD not modeled

as traction station

protection

modeling is under

implementation in

MiPSCT

162

INDIAN RAILWAY TRACTION_RAJAMPET INDIAN RAILWAY

SLD not modeled

as traction station

protection

modeling is under

implementation in

MiPSCT

163 JSW CEMENT LTD JSW yes

164KORUKONDA

MEGA ENGINEERS &

INFRASTRUCTURES LTDyes

165 MEPL_GS MEENAKSHI ENERGY LIMITED yes

166PATTISEEMA

MEGA ENGINEERS &


167 POLY&JED PSS GREENKO yes

168PURUSHOTHAPATNAM WATER RESOURCE DEPARTMENT yes

169 RAIN CII CARBON LTD_GS RAIN CII CARBON LTD yes

170RAMAVARAM

MEGA ENGINEERS &


171RAYALA_GS

RAYALA WIND POWER

COMPANY PRIVATE LTDyes

172 REGEN O&M SERVICES_GS REGEN POWER yes

173 SAIPURAM WIND ENERGY_RE GREENKO yes

174SAMALKOT POWER STATION_GS RELIANCE INFRASTUCTURE LTD yes

175 SARDA METAL& ALLOYS LTD_GS SARDA METAL& ALLOYS LTD yes

176 SIEMENS GAMESHA RENEWABLE PVT LTD GREENKO yes

177SIMHAPURI_GS

SIMHAPURI ENERGY PRIVATE

LIMITEDyes

178SPECTRUM POWER _GS

SPECTRUM POWER GENERATION

LTDyes

179SUZLON ENERGY LTD_GS

SUZLON POWER

INFRASTRUCTURE LTDyes

180SUZLON GLOBAL SERVICE_GS

SUZLON POWER


181SUZLON INFRASTRUCTURE PVT LTD_GS

SUZLON POWER


182THETA ENERGY PVT LTD

SUZLON POWER


183

ULTRATECH CEMENT LTD ULTRATECH CEMENT LTD

Basic SLD is

attached.

Protection is not

modeled as CT

details are not

available.

184 VIZAG STEEL PLANT_GS CPSE yes

185 WIND WORLD INDIA LTD_GS WIND WORLD INDIA LTD yes

186

HINDUSTAN PETROLEUM (HPCL) HPCL

Substation is not

visited as we were

unable to get

contact details for

sending

permission letter.

Annexure-IV

Page 3 of 18

187

ESSAR STEEL LTD ESSAR STEEL

Substation is not

visited as we were

unable to get

contact details for

sending

permission letter.

188 A.P. PAPER MILLS A.P. PAPER MILLS Visited recently

189

SILK ROAD SUGARS SILK ROAD SUGARS

Substation is not

visited as the

capacity is less

than 25MW

190 JAIPORE SUGARS LTD JAIPORE SUGARS LTD Visited recently

191

VRK SUGARS LTD. VRK SUGARS LTD.

Substation is not

visited as the

capacity is less

than 25MW

192BHARATHI CEMENTS, NALLALINGAYA PALLI

BHARATHI CEMENTS,

NALLALINGAYA PALLI Visited recently

193 WANEEP SOLAR WANEEP Visited recently

194ANDRA SUGARS

ANDHRA SUGARS CHEMICAL &

FERTILISERS Visited recently

Indicates SLD is submitted by utility . PRDC yet to

provide SLD

Nellore 400kV? and Nellore Pooling Station?

Kurnool? And Narnoor?

Annexure-IV

Page 4 of 18

SL. NO. SS NAMESLD prepared by

PRDC

Utilities responded

to SLDsfinalized or not

1 RTS-B_GS TSGENCO yes yes

2 KAKATHIYA THERMAL PP_GS TSGENCO yes yes

3 AMRP LIFT IRIGATION TSGENCO yes

4 AMRP LOW LEVEL CANEL _PUMP HOUSE TSGENCO yes

5 SRISAILAM LEFT BANK PP_GS TSGENCO yes yes

6 KOTHAGUDEM THERMAL PS _GS TSGENCO yes yes

7 KOTHAGUDEM THERMAL PS-5&6_GS TSGENCO yes yes

8 NAGARJUN SAGAR MAIN PH TSGENCO yes yes

9 PULICHINTALA_GS TSGENCO yes yes

10 NAGARJUN SAGAR LEFT CANEL TSGENCO yes

11 RECEIVING STATION-NAGARJUNA SAGAR TSGENCO yes yes

12 SINGUR DAM_ GS TSGENCO yes yes

13 NIZAM SAGAR_GS TSGENCO yes yes

14 POCHAMPAD_GS TSGENCO yes yes

15 LOWER JURALA_GS TSGENCO yes yes

16 UPPER JURALA_GS TSGENCO yes yes

17 DURSHED TSTRANSCO Yes

18 RSS(MALYALPALLY) TSTRANSCO Yes

19 SIRICILLA TSTRANSCO Yes

20 BOMMAKAL TSTRANSCO Yes

21 MEDARAM TSTRANSCO Yes

22 HUZURABAD TSTRANSCO Yes

23 JAGTIAL TSTRANSCO Yes

24 MURMUR TSTRANSCO Yes

25 VEMENURU TSTRANSCO Yes

26 MANDAMARI TSTRANSCO Yes yes

27 MANTHANI TSTRANSCO Yes

28 JULURUPADU TSTRANSCO Yes

29 ASUPAKA TSTRANSCO Yes

30 BUDIDAMPADU TSTRANSCO Yes

31 MANAGURU TSTRANSCO Yes

32 WARANGAL TSTRANSCO Yes

33 NAGARAM TSTRANSCO Yes

34 WADDEKOTHAPALLY TSTRANSCO Yes

35 MALLARAM TSTRANSCO Yes

36 MAHABUBABAD TSTRANSCO Yes

37 GANGARAM TSTRANSCO Yes

38 BHEEMAGHANPUR TSTRANSCO Yes

39 NARKEPALLY TSTRANSCO Yes

40 KM PALLY TSTRANSCO Yes

41 MIRGALEGUDA TSTRANSCO Yes

42 CHALAKARTHY TSTRANSCO Yes

43 BHONGIR TSTRANSCO Yes

44 SALIVAGU TSTRANSCO Yes

45 SEETHARAMPATTINAM TSTRANSCO Yes

46 HIAL TSTRANSCO Yes

47 FAB CITY TSTRANSCO Yes

48 SHAMSHABAD TSTRANSCO Yes

49 BONGLOOR TSTRANSCO Yes

50 MAMIDIPALLY TSTRANSCO Yes

51 MAHESHWARAM TSTRANSCO Yes

52 SURYAPET TSTRANSCO Yes

53 SITHAPURAM TSTRANSCO Yes

54 ERRAGADDA TSTRANSCO Yes

55 OSMANIA UNIVERSITY TSTRANSCO Yes

56 IMLIBUN TSTRANSCO Yes

57 GUNROCK TSTRANSCO Yes

58 GACHIBOWLI TSTRANSCO Yes

59 SHANKARPALLY TSTRANSCO Yes

60 MEDCHAL TSTRANSCO Yes

61 MIYAPUR TSTRANSCO Yes

62 NAGOLE TSTRANSCO Yes

63 HAYATH NAGAR TSTRANSCO Yes

64 MALKARAM TSTRANSCO Yes

65 SHAPUR NAGAR TSTRANSCO Yes

66 SHIVARAMPALLY TSTRANSCO Yes

67 GHANAPUR TSTRANSCO Yes

68 MOULAI-ALI TSTRANSCO Yes

69 CHANDRAYANGUTTA TSTRANSCO Yes

70 POCHARAM TSTRANSCO Yes

71 PARIGI TSTRANSCO Yes

72 TANDUR TSTRANSCO Yes

73 KOSIGI TSTRANSCO Yes

74 NARSAPUR TSTRANSCO Yes

75 GAJWEL TSTRANSCO Yes

76 SIDDIPET TSTRANSCO Yes

77 KONDAPAKA TSTRANSCO Yes

78 SADASIVAPET TSTRANSCO Yes

79 YEDDUMAILARAM TSTRANSCO Yes

80 MINPUR TSTRANSCO Yes

81 DICHAPALLY 220kV TSTRANSCO Yes

82 KAMAREDDY TSTRANSCO Yes

83 DICHAPALLY 400kV TSTRANSCO Yes

84 NIRMAL TSTRANSCO Yes

85 BHEEMGAL TSTRANSCO Yes

86 MAHBUBNAGAR TSTRANSCO Yes

87 VELTOOR TSTRANSCO Yes

Status of Confirmation of Orderliness of Protection SLD's of Telangana

Annexure-IV

Page 5 of 18

88 WANAPARTHY TSTRANSCO Yes

89 THIMMAJIPET TSTRANSCO Yes

90 JURALA TSTRANSCO Yes

91 SINGOTAM TSTRANSCO Yes

92 YELLUR TSTRANSCO Yes

93 NETTAMPAD STAGE-1 TSTRANSCO Yes

94 NETTAMPAD STAGE-2 TSTRANSCO Yes

95 KALWAKURTHY TSTRANSCO Yes

96 DINDI TSTRANSCO Yes

97 SHADNAGAR TSTRANSCO Yes

98 GUDIPALLYGATTU TSTRANSCO Yes

99 REGUMANAGADDA TSTRANSCO Yes

100 GOWRIDEVIPALLY TSTRANSCO Yes

101 JONNALABOGUDA TSTRANSCO Yes

102 PULUKURTHY TSTRANSCO Yes

103 MEDARAM LIS

104 RAMADUGU LIS

105 SUNDILLA LIS

106 ANNARAM(LIS)

107 MEDIGADDA(LIS)

108 GUDEMDODDI(LIS) (NETTAMPAD STAGE-1)

109 MARLAVIDU(LIS) (NETTAMPAD STAGE-2)

110 MADUGULA

111 ASWARAOPET

112 KALLURU

113 KETHIREDDYPALLI

114 PEDDAGOPATHI_SS

115 KHAMMAM PGCIL SR-1 yes

116 NAGARJUN SAGAR-PGCIL PGCIL SR-1 yes

117 MAHESHWARAM-PGCIL PGCIL SR-1 yes

118 GHANAPUR-PGCIL PGCIL SR-1 yes

119 NIZAMABAD PGCIL PGCIL SR-1 yes

120 OGLAPUR PGCIL PGCIL SR-1 yes

121 NTPC SOLAR NTPC yes

122 NTPC SUPER THERMAL PS-RAMAGUNDAM_GS NTPC yes

123 ACME SIRCILLA_SOLAR yes yes

124 MYTRAH SHANIGARAM others yes

125 KARVY SOLAR-ANDAGULAPET others yes

126 SINGARENI THERMAL PP_GS others yes

127 ACME SUN WORLD -JAGTIAL_SOLAR others yes

128 RENEW POWER-ANDAGULAPET_SOLAR others yes

129 NEO-SOLREN_SOLAR others yes

130 JILESH_SOLAR others yes

131 VISHVARUPA SOLAR POWER

132 RENEW SOLAR-MULLAKANNUR others yes

133 ACME SOLAR-RAJPET others yes

134 PARAMPUJYA_SOLAR others yes

135 MYTRAH-KM PALLY_SOLAR others yes

136 ZUKA_SOLAR others yes

137 SURAJKIRAN_SOLAR-KMPALLY others yes

138 NBEIL_GS others yes

139 SURYODAY_SOLAR others yes

140 SUNSHAKTHI_SOLAR others yes

141 ACME SOLAR - NIZAMBAD others yes

142 DIVINE SOLREN_SOLAR others yes

143 HEAVY WATER PLANT-MANUGURU others yes

144 UJVAL TEJA SOLAR others yes

145 MYTRAH VAYU WIND others yes

146 CLEAN-PARIGI_SOLAR others yes

147 MYTHRAH-PARIGI_SOLAR others yes

148 WINSOL SOLAR others yes

149 DAYAKARA SOLAR POWER others yes

150 KAROOR SOLAR others yes

151 POLEPALLY SOLAR others yes

152 GLOBAL SOLAR others yes

153 RENEW POWER SHAKTHI -MINPUR others yes

154 ENERGON SOLAR -SADASHIVPET others yes

155 DINKAR SOLAR-MINPUR others yes

156 SURAJKIRAN SOLAR-SIDDIPET others yes

157 KARVY SOLAR-SADASIVAPET others yes

158 ENERGON SOLAR -MINPUR others yes

159 ACME SOLAR-SADASIVAPET others yes

160 RENEW SOLAR-SADASHIVPET others yes

161 BEL others yes

162 RENEW SOLAR-KAMAREDDY others yes

163 PRATHAMESH-SOLAR others yes

164 SE SOLAR others yes

165 SUN BORNE-SOLAR others yes

166 GRAHATI SOLAR others yes

167 RENEW AKSHYA URJA-SOLAR_GUDIBANDA others yes

168 TRANSFORM SUN ENERGY-SOLAR others yes

169 SUPRASANNA-SOLAR others yes

170 ACME MEDAK SOLAR others yes

171 AZURA POWER SOLAR others yes

Indicates SLD is submitted by utility . PRDC yet to

provide SLD

Annexure-IV

Page 6 of 18

SL. NO. SS NAME OWNERSLD prepared by

PRDC

Utilities responded

to SLDsfinalized or not

1 AMBALAMUGAL 220kV KSEBL Yes

2 AREAKKODE (KOZHIKODE) 220kV KSEBL Yes yes

3 BARAPOLA_GS KSEBL Yes yes

4 BRAHMAPURAM 220kV KSEBL Yes yes

5 BRAHMAPURAM_GS KSEBL No

6 EDAMON 220kV KSEBL Yes yes

7 EDAPPON 220kV KSEBL Yes yes

8 IDAMALAYAR_GS KSEBL Yes yes

9 IDUKKI 220kV KSEBL Yes yes

10 KAKKAD_GS KSEBL Yes yes

11 KALAMASSERY 220kV KSEBL Yes yes

12 KALLADA_GS KSEBL Yes yes

13 KANHIRODE 220kV KSEBL Yes yes

14 KANIAMPETTA 220kV KSEBL Yes yes

15 KUNDARA 220kV KSEBL Yes yes

16 KUTTIADY_GS+KES+KAES KSEBL Yes yes

17 LOWER PERIYAR 220kV KSEBL Yes yes

18 MADAKKATHARA 400kV KSEBL Yes yes

19 MALANKARA-GS KSEBL Yes yes

20 MALAPPARAMBA 220kV KSEBL Yes yes

21 MYLATTY 220kV KSEBL Yes yes

22 NALLALAM 220kV KSEBL Yes yes

23 KOZHIKODE DISEAL POWER PLANT_GS KSEBL Yes yes

24 NERIAMANGALAM HEP_GS KSEBL Yes yes

25 NEW PALLOM 220kV KSEBL Yes yes

26 ORAKATTERY(VADAKARA) 220kV KSEBL Yes yes

27 PALAKKAD 220kV KSEBL Yes yes

28 PALLIVASAL_GS KSEBL Yes yes

29 PALLOM 220kV KSEBL Yes yes

30 PANNIAR_GS KSEBL Yes yes

31 PORINGAL_GS & PLBE_GS KSEBL Yes yes

32 POTHENCODE 220kV KSEBL Yes yes

33 PUNNAPARA 220kV KSEBL Yes yes

34 SABARIGIRI(MOOZHIYAR)_GS KSEBL Yes yes

35 SENGULAM_GS KSEBL Yes yes

36 SHOLYAR_GS KSEBL Yes yes

37 SHORANUR 220kV KSEBL Yes yes

38 TALIPARAMBA 220kV KSEBL Yes yes

39 AMBALATHARA 220kV KSEBL Yes yes

40 Kattakada KSEBL No

41AREAKKODE (KOZHIKODE)(400/ 220kV)

PG PGCIL (SR-II) Yes yes

42 KOCHI-EAST(PALLIKARA) 400kV PGCIL (SR-II) Yes

43 PALAKKAD(ELAPULLY) 400kV PGCIL (SR-II) Yes

44 POTHENCODE 400kV PGCIL (SR-II) Yes

45 THRISSUR 400kV PGCIL (SR-II) Yes

46 KAYAMKULAM_GS NTPC Yes yes

47 AGALI(SUZLON)_GS SUZLON Yes yes

48 AMBALATHARA_GS

Indian Renewable

Energy Development

Agency

No

49 CIAL_GSCochion International

Airport LtdYes yes

50 INOX WIND FARM_GS INOX No

51 KARIKKAYAM_GSAyyappa Hydro Power

LtdYes yes

52 KUTHANGL HEP_GSIndsil Hydro Power &

Manganese LtdYes yes

53 MANIYAR_GSManiyar Hydro

Electric PowerYes yes

54 PCBL_GSPhillips Carbon Black

ltdYes yes

55PUSHPAKANDAM

(RAMAKKELMEDU)_GSVESTAS Yes yes

Indicates SLD is submitted by utility .

PRDC yet to provide SLD

Status of Confirmation of Orderliness of Protection SLD's for Kerala

Annexure-IV

Page 7 of 18

SL. NO. SS NAME OWNERSLD prepared

by PRDC

Utilities

responded to

SLDs

finalized or not

1 Alliyar PH_GS TANGEDCO yes

2 Kadamparai PH_GS TANGEDCO yes

3 Kundah 1_GS TANGEDCO yes






9 Moiyar_GS TANGEDCO yes

10 Pushep_GS TANGEDCO yes

11 Sarkarpathy_GS TANGEDCO yes

12 Sholiyar PH1 _GS TANGEDCO yes

13 Sholiyar PH2_GS TANGEDCO yes

14 Periyar PH_GS TANGEDCO yes

15 Suriyalur PH_GS TANGEDCO yes

16 Bhavani kattalai barrage 2_GS TANGEDCO yes


18 Lower Bhavani hydro&RBC_GS TANGEDCO yes


20 LMHP -4_GS TANGEDCO yes



23 Mettur Dam PH_GS TANGEDCO yes

24 MTPH_GS TANGEDCO yes

25 MTPS 1_GS TANGEDCO yes

26 MTPS 2_GS TANGEDCO yes

27 Lower Mettur barrage 3_GS TANGEDCO yes

28 NCTPS -1_GS TANGEDCO yes

29 NCTPS -2_GS TANGEDCO yes

30 ETPS TANGEDCO yes

31 Tuticorin Thermal Power Station_GS TANGEDCO yes

32 Servalar PH_GS TANGEDCO yes

33 Papanasam PH_GS TANGEDCO yes

34 Kodayar 1_GS TANGEDCO yes

35 Kodayar 2_GS TANGEDCO yes

36 Bhavani Barraige -1_GS TANGEDCO yes

37 Bhavani Barraige -2_GS TANGEDCO yes

38 Pykara_GS TANGEDCO yes

39 BBGTPS TANGEDCO yes

40 KGTPS(KUTTALAM) TANGEDCO yes

41 THIRUMAKOTTAI(KOVILKALPAL) TANGEDCO yes

42 VGTPS TANGEDCO yes

43 Aliyar TANTRANSCO yes

44 Anaikadavu TANTRANSCO yes

45 Arasur 220kV TANTRANSCO yes

46 Coimbatore TANTRANSCO yes

47 basin Bridge TANTRANSCO yes

48 Karavalur TANTRANSCO yes

49 Othakalamandapam TANTRANSCO yes

50 Palladam TANTRANSCO yes

51 Ponnapuram TANTRANSCO

52 Rasipalyam TANTRANSCO yes

53 Sadayapalyam TANTRANSCO

54 Mettur TANTRANSCO

55 Thudiyalur TANTRANSCO yes

56 Myvadi TANTRANSCO yes

57 Udumelpet TANTRANSCO yes

58 Pasumalai TANTRANSCO yes

59 Alagarkovil TANTRANSCO yes

60 Chekkanurani TANTRANSCO yes

61 Kinnimangalam TANTRANSCO yes

62 Theni TANTRANSCO yes

Status of Confirmation of Orderliness of Protection SLD's for TamilNadu

Annexure-IV

Page 8 of 18

63 Karaikudi_230kV TANTRANSCO yes

64 Kavanoor TANTRANSCO yes

65 Vazhathoor TANTRANSCO yes

66 Kamuthi TANTRANSCO yes

67 Sembatti TANTRANSCO yes

68 Ranganathpuram TANTRANSCO yes

69 Thiruvalam_400kV TANTRANSCO yes

70 Echur TANTRANSCO yes

71 Arani TANTRANSCO yes

72 Thiruvalam_230kV TANTRANSCO yes

73 Vinnimangalam TANTRANSCO yes

74 Mosur TANTRANSCO yes

75 Alamathi TANTRANSCO yes

76 Gummidipondi TANTRANSCO yes

77 Thervaikandikai TANTRANSCO yes

78 Perambalur TANTRANSCO yes

79 Trichy TANTRANSCO yes

80 Samayapuram TANTRANSCO yes

81 Pudukkottai TANTRANSCO yes

82 Thanjavur TANTRANSCO yes

83 Kumbakonam TANTRANSCO yes

84 Kadalangudi TANTRANSCO yes

85 Thiruvarur TANTRANSCO yes

86 Karambayam TANTRANSCO yes

87 Alundur TANTRANSCO yes

88 Poyyur TANTRANSCO yes

89 Mondipatty TANTRANSCO yes

90 Jammunathapuram TANTRANSCO yes

91 Sriperumbudur TANTRANSCO yes

92 Hyundai TANTRANSCO yes

93 Oragadam TANTRANSCO

94 Mambakkam sipcot TANTRANSCO yes

95 Nokia TANTRANSCO yes

96 Singaperumal Kovil TANTRANSCO yes

97 Omega TANTRANSCO yes

98 Veerapuram TANTRANSCO yes

99 Thingalur TANTRANSCO yes

100 Anthiyur TANTRANSCO yes

101 Gobi TANTRANSCO yes

102 Ingur TANTRANSCO yes

103 Palakapalayam TANTRANSCO yes

104 Pugalur TANTRANSCO yes

105 Kurukathi TANTRANSCO yes

106 Unjanai TANTRANSCO yes

107 K R Thoppur TANTRANSCO yes

108 Valayapatti TANTRANSCO yes

109 Pudhansandhai TANTRANSCO yes

110 Nethimedu TANTRANSCO yes

111 Singapuram TANTRANSCO yes

112 Deviakurichi TANTRANSCO yes

113 Kariyamangalam TANTRANSCO yes

114 Palavadi_400kV TANTRANSCO yes

115 Singarapet TANTRANSCO yes

116 Gurubarapalli TANTRANSCO yes

117 Hosur TANTRANSCO yes

118 Annupakulam TANTRANSCO yes

119 N N Patty TANTRANSCO yes

120 Amuthapuram TANTRANSCO yes

121 Kayathar TANTRANSCO yes

122 Muthumalingapuram TANTRANSCO yes

123 Eachangadu TANTRANSCO yes

124 Villupuram TANTRANSCO yes

125 Cuddalore TANTRANSCO yes

126 T V Malai TANTRANSCO yes

127 Acharapakkam TANTRANSCO yes

128 Sathanur Dam_GS TANTRANSCO yes

Annexure-IV

Page 9 of 18

129 Ulundurpet TANTRANSCO yes

130 Korattur TANTRANSCO yes

131 Ambattur TANTRANSCO yes

132 Thiruverkadu TANTRANSCO yes

133 Koyembedu CMRL TANTRANSCO yes

134 Koyembedu TANTRANSCO yes

135 Athipattu TANTRANSCO yes

136 Kodikurchy TANTRANSCO yes

137 Veeranam TANTRANSCO yes

138 Kanarpatti TANTRANSCO yes

139 Sankaneri TANTRANSCO yes

140 S.R. Pudur TANTRANSCO yes

141 Udayathur TANTRANSCO yes

142 Meelavitan TANTRANSCO yes

143Sterlite

TANTRANSCO

144 Tuticorin Auto TANTRANSCO yes

145 Taramani TANTRANSCO yes

146 Siruseri TANTRANSCO yes

147 Kits Park TANTRANSCO yes

148 RA Puram TANTRANSCO yes

149 Guindy TANTRANSCO yes

150 Kadapperi TANTRANSCO yes

151 Alandur TANTRANSCO yes

152 Mylapore TANTRANSCO yes

153 Basin Bridge TANTRANSCO

154 Vyasarpadi TANTRANSCO yes

155 Ottiyambakkam TANTRANSCO yes

156 Tondairpet TANTRANSCO yes

157 Kilpauk TANTRANSCO yes

158 Manali TANTRANSCO yes

159 S V CHATRAM TANTRANSCO yes

160 KUMBAKKONAM TANTRANSCO

161 VALAYAPATTY TANTRANSCO

162 MUTHURAMALINGAPURAM TANTRANSCO

163 SAVASAPURAM TANTRANSCO yes

164 PORUR TANTRANSCO No

165 KANCHEEPURAM TANTRANSCO No

166 THAPPAGUNDU TANTRANSCO No

167 Kayathar TANTRANSCO yes

168 Arasur 400kV PGCIL (SR-II) yes

169 Udumelpet-400kV PGCIL (SR-II) yes

170 Nagapattinam PGCIL (SR-II) yes

171 Karaikudi_400kV PGCIL (SR-II) yes

172 Thiruvalam_765kV PGCIL (SR-II) yes

173 Sriperumbudur PGCIL (SR-II) yes

174Pugalur

PGCIL (SR-II) yes

175 K R Thoppur -PG(SALEM) PGCIL (SR-II) yes

176 Palavadi_765kV PGCIL (SR-II) yes

177 Hosur_PG PGCIL (SR-II) yes

178 Madurai PGCIL (SR-II) yes

179 Tuticorin PGCIL (SR-II) yes

180 Thirunelveli PGCIL (SR-II) yes

181 TUTICORIN GIS PGCIL (SR-II) yes

182 Trichy PGCIL (SR-II) yes

183 KALIVANTANAPATTU PGCIL (SR-II) yes

184 Neyveli TPS 1 exp_GSNeyveli Lignite Corporation

India Ltdyes

185 Neyveli TPS 2 exp_GSNeyveli Lignite Corporation

India Ltdyes

186 Neyveli TPS I_GSNeyveli Lignite Corporation

India Ltdyes

187 Neyveli TPS II_GSNeyveli Lignite Corporation

India Ltdyes

Annexure-IV

Page 10 of 18

188 Neyvelli mines 1 Neyveli Lignite Corporation

India Ltdyes

189 Neyvelli mines 2 Neyveli Lignite Corporation

India Ltdyes

190 MAPS_GS NPCIL

191 Kudankulam Nuclear PP_GS NPCIL

192 IL & FS_GS IL &FS

193 NTPL -Tuticorin_GS NLC Tamilnadu Power Ltd yes

194 CEPL - Tuticorin_GS Coastal Energen Pvt Ltd yes

195 Vallur_GS NTECL

196 Re-Gen Power Tech_GS(Anaikadavu) REGEN

197 ARS ARS Energy Pvt Ltd yes

198 OPG OPG Power Generation Ltd yes

199 Kamatchi_GSKamatchi Sponge & Power

Corporation Ltdyes

200 Suryadev_GSSuryadev Alloys Power Pvt

Ltdyes

201 Cauvery_GSCauvery Power Generation

Corporation Ltdyes

202 PPN Power GEN company_GS PPNPGPL

203 TAQA(STCMS) STCMS

204 IND Bharath IPP_GS IBGCL

205 Vedanta ltd,TPP(Sterlite)_GS VL

206 IND Bharath TPP_GS IBTPL

207 MALCO_GS Malco Eenergy Ltd

208 WATSON(PERIYAPATTI) TATAPOWER

209 GAMESA WPP(SANGARAPERI) GWPP

210 AGETL ADANI

211 KSPL ADANI

212 WELSPUN(Tata Power) TATAPOWER

213 TNPL PUGALURTamilnadu Newsprint &

Papers Ltd

214 VELLAPANERI SUZLON

215 ARKAY ARKAY

216 CCCL ARIYALURChettinad Cement

Corporation Ltd

217 CCCL KARIKKALIChettinad Cement

Corporation Ltd

218 CCCL PULIYURChettinad Cement

Corporation Ltd

219 CHEMPLAST(RC PLANT) Chemplast Sanmar Ltd

220 CORAMENDALCoromendal Electric

Company Ltd

221 DALMIA ARIYALUR Dalmia Cement Bharat Ltd

222 DALMIA DALMIYAPURAM Dalmia Cement Bharat Ltd

223 JSW JSW Power Ltd

224 LTPCLLanco Tanjore Power

Corporation Ltd

225 MMS STEELS MMS STEEL

226 PIONEER PIONEER

227 REGEN POWER TECH(PARUTHIYUR) REGEN

228 SAI REGENCYSAI REGENCY POWER

CORPORATION Ltd

229 SAIL Steel Authority India Ltd

230 SREE RENGARAJAN SPOT Shree Rangaraj ispat Pvt Ltd

231 TNPL MOONDIPATTITamilnadu Newsprint &

Papers Ltd

232 ASPEN ASPEN

233 HITECH CARBON Adithya Birla

234 Thulasiyan Thulsyan Nec Ltd yes

Annexure-IV

Page 11 of 18

235 TCPL TCPL yes

236 PPCL PPCL

237 MCL (Ramco Cements) Ramco Group

238 ICL India Cement Ltd

239 DCW DCW

240 SAKTHI SUGARS APPAKOODAL SAKTHI SUGARS

241 SAKTHI SUGARS POONDURAI SEMUR SAKTHI SUGARS

242 SHESHASAYEE PAPER BOARDS SHESHASAYEE PAPER

BOARDS

243 GRIRAJ GRIRAJ

244 S.P.SOLAR S.P.SOLAR

245 NLC NLC

246 ADHAVAN ADANI

247 KATHIRAVAN ADANI

248 NLC (PES) NLC

249 NLC (JACKSON) NLC

250 RREL RREL

251 KREL KREL

252 RSPL RSPL

253 NLC (REFAX) NLC

254 PENNA PENNA

255 RK RK

256 GRT GRT

257 RRE RRE

258 BETA WIND FORM BETA WIND FORM

259 Madras Sugars M/s Madras Sugars

260 Bannari Amman Sugars, Unit 4 M/s Bannari Amman Sugars,

Unit 4

261 E I D Parry Sugars M/s E I D Parry Sugars

262 SEI PHOEBUS GREENKO GROUP PVT.LTD

valuthur? As S.No. 65

As sanganeri?

Indicates SLD is submitted by utility .

PRDC yet to provide SLD

Annexure-IV

Page 12 of 18

SL. NO. SS NAME OWNER

SLD

prepared

by PRDC

Utilities

responde

d to SLDs

finalized or not

1 Villianur PED yes yes

2 Thondamanatham PED yes yes

3 Bahoor PED yes yes

4 Pondy PGCIL (SR-II) yes yes

Status of Confirmation of Orderliness of Protection SLD's for TamilNadu

Annexure-IV

Page 13 of 18

SL.NO. SS NAMEVOLTAGE

LEVEL(kV)OWNER Status

Details of elements not

modeled due to non-

availability of data

Details of elements not

modeled due to non-

availability of tool in MiP-

PSCT

Utilities

responded to

SLDs

finalized or not

1

SHIVANSAMUDRA_GS 66/11/11/1.45 KPCL Attached -

60N (Neutral Current

Unbalance) relay is not

modelled.

87N (Restricted Earth Fault)

relay (for generator) is not

modeled.

2SHIMSHA GS POWER_GS 66/2.2/0.433 KPCL Attached -

50 BF (Breaker failure) relay is

not modeled

3ALMATTI_GS 220/11/0.415 KPCL Attached

Bus bar differential

(87B) not modeled as


not modeled

4GHATAPRABHA _GS 110/11/0.415 KPCL Attached



46 (negative seq. realy) not

modelled for capacitor bank

5MUNIRABAD_GS 220/110/66/33/11 KPCL Attached - -

6YTPS_GS 27/400/33/11.5 KPCL Attached -


not modeled

7BTPS_GS 400/220/21/11.5 KPCL Attached -


not modeled

8RTPS_GS

15.75/16.5/400/22

0/15/33/6.9KPCL

Attached (2

drawings)-


not modeled

9KADRA _GS

220/11/0.415/0.43

3KPCL Attached -


not modeled

10KODASALLI _GS 220/11/0.415 KPCL Attached -


not modeled

11SUPA _GS 110/11/0.415 KPCL Attached



59N(Neutral Voltage

Displacement) relay is not

12NAGAJHARI_GS 220/11/11/0.415 KPCL Attached - -

13MALLAPURA_MINI_GS 110/6.6/0.415 KPCL Attached -

21PB (Phase Backup) relay (for

shunt reactor) is not modeled

14SHARAVATHY_GS 220/11/0.415 KPCL Attached -



15GERUSOPPA_GS 220/11/0.433 KPCL Attached -


not modeledyes

16LINGANAMAKKI_GS 110/11/0.415 KPCL Attached

Generator relay details

not



17MGHEW_GS 110/11/0.415 KPCL Attached


(87B) not modeled as -

18BHADRA LB&RB_GS 66/11/0.415 KPCL Attached -


not modeled

19VARAHI UGPH_GS 220/11/0.415 KPCL Attached -


not modeled

20MANI DAM PH_GS 110/11/0.415 KPCL Attached - -

21

CHAMARAJANAGARA_SS 220/66/11 KPTCL Attached -


not modeled.



22HOOTAGALLY_SS 220/66/11/0.433 KPTCL Attached - -

23KADAKOLA_SS 220/66/11/0.433 KPTCL Attached




not modeled

24VAJMANGALA_SS 220/66/11/0.433 KPTCL Attached - -

25KUSHALNAGAR_SS 220/66/11/33 KPTCL Attached


(87B) not modeled as 60N Relay are not modelled

26TUBINAKERE_SS 220/66/11/0.433 KPTCL Attached




not modeled

27MADHUVANAHALLI_SS 220/66/11/0.433 KPTCL Attached -

59N HAS NOT BEEN MODELLED

50BF HAS NOT BEEN

28HUYGONAHALLI(K R PET)_SS 220/66/11/0.433 KPTCL Attached - -

29TK HALLI_SS 220/66/11/0.433 KPTCL Attached -


not modeled

30MK _HUBBALI_SS 220/110/11/0.433 KPTCL Attached - -

31DONI_SS 400/220/33 KPTCL Attached -


not modeled.

32HAVERI_SS 220/110/11 KPTCL Attached - -

33SRS HUBBLI_SS

220/110/33/11/0.4

33KPTCL Attached - -

34BIDNAL_SS 220/110/11/0.433 KPTCL Attached - -

35RANEBENNUR_SS

220/110/33/11/0.4

33KPTCL Attached -

46 (negative seq. realy) not

modelled for capacitor bank

36GADAG_SS 220/110/11 KPTCL Attached



37SARJAPURA_SS 220/66/11/0.433 KPTCL Attached - -

38VIKAS TECH PARK_SS 220/66/11/0.433 KPTCL Attached - -

39SUBRAMANYAPURA_SS 220/66/11 KPTCL Attached


(87B) not modelled as


not modeled

40MAHALINGAPUR_SS

220/110/33/11/0.4


41BAGALKOT_SS

220/110/33/11/0.4

33KPTCL Attached -


not modeled

42VAJRAMATTI_SS 220/110/11/0.433 KPTCL Attached - -

43BASAVANA BAGEWADI _SS

220/110/33/11/0.4

33KPTCL Attached -

79 (Auto Reclosure) relay is not

modeled

44INDI_SS

220/110/33/11/0.4


45BIJAPUR_SS

220/110/33/11/0.4


Status of Finalising PSLD's

Annexure-IV

Page 14 of 18

46ATHANI_SS

220/110/33/11/0.4


47SAVADATTI_SS

220/110/33/11/0.4


48GHATAPRABHA _SS

220/110/33/11/0.4

33KPTCL Attached -


not modeled

49CHIKODI_SS

220/110/33/11/0.4

33KPTCL Attached -


not modeled

50KUDACHI_SS

220/110/33/11/0.4


51BELAGAVI_SS 220/110/11 KPTCL Attached -


not modeled.

52ITTAGI_SS 220/66/11 KPTCL Attached - -

53KUSHTAGI_SS

220/110/33/11/0.4


54RAICHUR_SS 220/110/33/11 KPTCL Attached -


not modelled

55MALLAT_SS 220/110/11 KPTCL Attached - -

56LINGSUGUR_SS 220/110/33/11 KPTCL Attached


(87B) not modelled as


not modelled

57ALLIPURA_SS 220/110/11 KPTCL Attached -


not modeled.

58SINDHANUR_SS 220/110/11/0.433 KPTCL Attached -


not modeled

59SEDAM_SS 220/110/33/11 KPTCL Attached -


not modeled

60SHAHABAD_SS 220/110/11 KPTCL Attached - -

61KAPANOOR_SS 220/110/11 KPTCL Attached -


not modeled

62HUMNABAD_SS 220/110/11/0.433 KPTCL Attached - -

63HALABARGA_SS 220/110/11/0.433 KPTCL Attached - -

64MALUR_SS 220/66/11 KPTCL Attached -


not modeled.

65GOWRIBIDANUR_SS 220/66/11/0.415 KPTCL Attached -


not modeled

66MADHUGIRI_SS 220/66/11 KPTCL Attached -


not modeled

67NITTUR_SS 220/110/33/11 KPTCL Attached - 50 BF relay is not modelled

68KB CROSS_SS 220/110/33/11 KPTCL Attached -


not modeled

69ANTHARASANAHALLI_SS 220/66/11/0.433 KPTCL Attached - -

70PAVAGADA_SS 220/66/11 KPTCL Attached - -

71JAGALUR_SS 400/220/33 KPTCL Attached -



72THALAK_SS 220/66/11 KPTCL Attached - -

73CHITRADURGA_SS 220/66/11/0.433 KPTCL Attached -


not modeled

74HIRIYUR _SS 220/66/11/0.433 KPTCL Attached -


not modeleD

75GUTTUR_SS 400/220/33 KPTCL Attached -


not modeled

76

NEELAGUNDA_SS 220/66/11 KPTCL Attached - -

77HONNALI_SS 220/66/11 KPTCL Attached -

59N HAS NOT BEEN MODELLED

50BF HAS NOT BEEN

78DAVANAGERE_SS 220/66/11/11 KPTCL Attached -



79KARWAR_SS 220/110/11 KPTCL Attached - -

80SIRSI_SS 220/110/11 KPTCL Attached -


not modeled

81AMBEWADI_SS 220/110/33/11 KPTCL Attached -


not modeled

82NELAMANGALA 400_SS 400/220/33 KPTCL Attached - -

83DOBOSPET 220KV_SS 220/66/11 KPTCL Attached - -

84BIAL,BEGUR 220KV_SS 220/66/11 KPTCL Attached -


not modelled

85A STATION 220KV_SS 220/66/11 KPTCL Attached -


not modeled

86DB PURA NRS 220KV_SS 220/66/11 KPTCL Attached -


not modeled

87KIADB DB PURA 220KV_SS 220/66/11/0.433 KPTCL Attached

87N for ICT-1 AND 2,

TRF-1 AND 2 are not -

88HEBBAL 220KV_SS 220/66/11 KPTCL Attached -


not modeled

89MAGADI 220KV_SS 220/66/11/0.433 KPTCL Attached - -

90NRS RAJAJINAGAR 220KV_SS 220/66/11 KPTCL Attached -


not modeled

91VRUSHABHAVATHY 220KV_SS 220/66/11/0.415 KPTCL Attached -


not modeled

92YELAHANKA 220KV_SS 220/66/11/0.433 KPTCL Attached - -

93SRS PEENYA 220KV_SS 220/66/11/0.415 KPTCL Attached -

59N (Neutral Displacement)

relay is not modelled

Annexure-IV

Page 15 of 18

94

DEVANAHALLI HARDWARE TECH

PARK 220KV_SS220/66/11 KPTCL Attached - -

95HOODY 400_SS 400/220/33 KPTCL Attached -

59N (Neutral Displacement)

relay is not modelled

96BIDADI 220KV_SS 220/66/11/0.433 KPTCL Attached




not modeled

97EAST DIVISION COMPOUND 220KV_SS 220/66/11/0.433 KPTCL Attached - -

98HAL 220KV_SS 220/66/11 KPTCL Attached -


not modeled

99HSR LAY OUT 220KV_SS 220/66/11/0.433 KPTCL Attached -


not modeled

100HOODY 220KV_SS 220/66/11 KPTCL Attached

Relays not modeled for

220kv bus coupler due -

101JIGANI 220KV_SS 220/66/11/0.433 KPTCL Attached - -

102KANAKAPURA 220KV_SS 220/66/11 KPTCL Attached - -

103NAGANATHPURA 220KV_SS 220/66/11/0.433 KPTCL Attached - -

104EPIP 220KV_SS 220/66/11 KPTCL Attached - -

105TALAGUPPA_SS 400/220/33 KPTCL Attached




not modeled

106BALLIGAVI_SS 220/110/11 KPTCL Attached - -

107MRS SHIVAMOGGA_SS

220/110/66/11/0.4

15KPTCL Attached -

87B partially done, 50BF not

modelled

108KADUR_SS 220/110/11 KPTCL Attached -


not modeled

109CHIKKAMGALUR_SS 220/66/11/0.415 KPTCL Attached - -

110YACHENAHALLY_SS 220/66/11/0.415 KPTCL Attached -


not modeled

111ARASIKERE_SS 220/110/11/0.415 KPTCL Attached - -

112HASSAN_SS 220/66/11 KPTCL Attached




not modeleD

113KADAVINAKOTE_SS 220/66/11/0.415 KPTCL Attached - -

114KAVOOR_SS

220/110/33/11/0.4


115NETLAMUDNUR_SS

220/110/33/11/0.4


116KEMAR_SS 220/110/11/0.415 KPTCL Attached

Relays are replaced in

s/s. waiting for relay -

117MSEZ BAJPE_SS 220/110/11/0.415 KPTCL Attached - -

118KOLAR_SS 220/66/11/0.415 KPTCL Attached -


not modeled

119CHINTAMANI_SS 220/66/11 KPTCL Attached -


not modeled

120HOSKOTE_SS 220/66/11/0.415 KPTCL Attached - -

121KHODAYS GLASS FACTORY_SS 220/66/11/0.415 KPTCL Attached - -

122YARANDANAHALLY_SS 220/66/11/0.415 KPTCL Attached - -

123NIMHANS_SS 220/66/11/0.415 KPTCL Attached - -

124SOMMANAHALLI_SS 220/66/11/0.415 KPTCL Attached -


not modelled

125SHAHAPUR_SS

220/110/33/11/0.4


126NARENDRA 220/110/11/0.433 KPTCL Attached - -

127ANCHEPALYA SS 220/66 KPTCL Attached - -

128HARTHI_SS 220 KPTCL Attached -


not modeled

129LINGAPURA_SS 220 KPTCL Attached - -

130BELLARY POOLING STATION_SS 400 KPTCL Attached -


not modeled

131RAICHUR_PG 765/400/33/0.415 PGCIL (SR-I) Attached -


shunt reactor) is not modeledyes

132MUNIRABAD _PG 400/220/33 PGCIL (SR-I) Attached - - yes

133BASTIPURA_SS 400/220/33 PGCIL (SR-II) Attached -

21PB (Phase Backup) relay

(for shunt reactor) is not

134NARENDRA_PG 400/220/33 PGCIL (SR-II) Attached - -

135BIDADI_PG 400/220/33 PGCIL (SR-II) Attached -



136SOMMANAHALLI_PG 400/220/33 PGCIL (SR-II) Attached -

79 (Auto Reclosure) relay is not

modeled

137VASANTHNARASAPUR _PG 400/220/33 PGCIL (SR-II) Attached - -

138HIRIYUR 400KV_PG 400/220/33/0.433 PGCIL (SR-II) Attached -


not modeled

139PAVAGADA_PG 400/220/33 PGCIL (SR-II) Attached -


not modeled

140YELAHANKA_PG 400/220/33 PGCIL (SR-II) Attached



141SHANTIGRAMA_PG 400/220/33/0.415 PGCIL (SR-II) Attached -



142KOLAR HVDC_SS

400/200/33/66/0.4

15PGCIL (SR-II) Attached - -

143KUDGI_PG 400 PGCIL (SR-II) Attached -



Annexure-IV

Page 16 of 18

144KUDGI THERMAL POWER STATION_GS

400/220/23.5/11.5

/3.45/33NTPC Attached - -

145KAIGA_GS

400/220/16.5/33/6

.9NPCIL Attached -



146UPCL_GS

400/220/33/22/6.9

/0.415/11UPCL Attached




shunt reactor) is not modeledyes

147JSW ENERGY LTD

400/220/33/11/10.

5/20/6.9JSWEL Attached - -

148WIND WORLD_HARTHI_GS 220/33/0.69/0.433

ECOREN

ENERGY IND

Attached as part

of SL no . 128- -

149AMPLUS SOLAR_HARTHI_GS 220/33/0.433

AMPLUS KN

SOLAR PVT LTDAttached - -

150HANUMAPUR LIS_SS 220/6.9/6.6/0.433 KBJNL Attached - -

151BALUTHI LIS_SS 220/6.9/6.6/0.415 KBJNL Attached -

59N(Neutral Voltage

Displacement) relay is not

152MASUTI LIS_SS 220/11/6.9 KBJNL Attached - -

153VYSHALI ENERGY PVT LTD_GS 220/33/0.433 GREENKO Attached - -

154GOPALPURA_SS 220/33/0.433

SUZLON

POWER Attached - -

155SAGITUR VENTURES INDIA PVT LTD 220/33/0.38

SAGITUR

VENTURES Attached - -

156AZURE POWER INDIA PVT LTD 220/11/0.38 AZURA POWER Attached - -

157WIND WORLD INDIA LTD 220/33/0.4

WIND WORLD

INDIA LTDAttached - -

158VISH WIND INFRASTRUCTURE INDIA PVT LTD 220/33/0.4

WIND WORLD


159GREEN INFRA WIND ENERGY GENERATION LTD 220/33/0.69

SEMBCORP

GREENINFRA Attached - -

160KUDREKONDA_WIND 220/33/0.69

SUZLON

POWER Attached - -

161HANUMANTAPPA_WIND 220/33/0.69

SUZLON

POWER Attached - -

162WISH WIND _ TADAS 220/33/0.415

WIND WORLD


163WIND WORLD INDIA LTD _ KANABARGI 220/33/0.4

WIND WORLD

INDIA LTDAttached -


not modeled

164OSTRO DAKSHIN POWER PVT LTD 220/33/0.69

OSTRO

DAKSHIN Attached - -

165SUZLON GLOBAL SERVICE LTD _ KUSHTAGI 220/33/0.69

SUZLON

POWER Attached - -

166VESTAS WIND TECHNOLOGY INDIA PVT LTD 220/33/0.69 VESTAS Attached - -

167EMBASSY ENERGY INDIA PVT LTD 220/33/0.4

EMBASSY

ENERGY INDIA Attached - -

168WARDHA SOLAR(MH) PVT LTD 220/33/0.5 ADANI Attached - -

169FOTUNE FIVE HPPL OF GREENKO LTD 220/33/0.69 GREENKO Attached - -

170RBRK 220/33/0.69 INOX Attached - -

171ATRIA PSS 220/33/0.69

ATRIA POWER

CORPORATION Attached - -

172GM NAVAR(MYTRAH VAYU KRISHNA WIND PLANT)220/33/0.69

GM NAVARA

WIND ENERGY Attached - -

173MULVAD 4TH 'A' LIS 220/6.6/0.415 KBJNL Attached - -

174

SIEMENS GAMESHA WIND POWER

PLANT220/33/0.69 GAMESA

SLD is not

available. Hence - -

175SUN PHOTO VOLTAIC ENERGY LTD 220/33/12

SUN PHOTO

VOLTAIC Attached



176

ENERGON SOLEQ RAVI INDIA POWER RESOURCES PVT LTD 220/33/0.575 VENA ENERGY Attached - -

177CLEANMAX PHOTO VOLTAIC PVT LIMITED 220/33/0.68

CLEANMAX

PHOTO Attached - -

178ORIENT CEMENTS 220/11.5/11/0.415

ORIENT

CEMENTS LTDAttached - -

179YARNAL_SS 220

GM NAVARA

WIND ENERGY Attached - -

180KANABURGI_SS 220

WIND WORLD


181

DKSSK CO GEN PLANT (Connnected

to Chikkodi)110 DKSSK

Visited recently.

Protection SLD - -

182KSSKN (Connected to Athini) 110 KSSKN

Visited recently.

Protection SLD - -

183

BGL WIND (Connected to Basawan

Bagewadi)33 BGL WIND

Visited recently.

Protection SLD - -

184

RBRK WIND(Connected to Basawan

Bagewadi)33 RBRK WIND

There is no

Connectivity - -

185ENERGON(Connected to Bijapur) 110 ENERGON

Visited recently.

Protection SLD - -

186HGMS (Connected to Chitradurga) 66 HGMS

Visited recently.

Protection SLD - -

187SUZLON(Connected to Chitradurga) 66 SUZLON

Visited recently.

Protection SLD - -

188AFTL (Connected to Gauribaidnur) 66 AFTL

Visited recently.

Protection SLD - -

189SUZLON(Connected to Hassan) 11 SUZLON

Visited recently.

Protection SLD - -

190RKP(Connected to Hiriyur) 66 RKP

Visited recently.

Protection SLD - -

191SUZLON(Connected to Hiriyur) 66 SUZLON

Visited recently.

Protection SLD - -

192ENERCON(Connected to Hiriyur) 66 ENERCON

Visited recently.

Protection SLD - -

194

LATUR WIND (Connected to

Lingsugur)110 LATUR

Visited recently.

Protection SLD - -

Annexure-IV

Page 17 of 18

195KDRPL (Connected to Lingsugur) 110 KDRPL

Visited recently.

Protection SLD - -

196CMHS (Connected to Lingsugur) 110 CMHS

Visited recently.

Protection SLD - -

197

WARADHA SOLAR (Connected to

Shapur)110 WARADHA

Visited recently.

Protection SLD - -

199

MYSORE MERCHENTILE LTD-CO GEN

(Connected to Savadathi)110

MYSORE

MERCHENTILE

Visited recently.

Protection SLD - -

200DIAMOND (Connected to Thallak) 66 DIAMOND

Visited recently.

Protection SLD - -

201VENUS (Connected to Thallak) 66 VENUS

Visited recently.

Protection SLD - -

202WELSPUN(Connected to Thallak) 66 WELSPUN

Visited recently.

Protection SLD - -

203SUZLON (Connected to Ittagi) 66 SUZLON

Visited recently.

Protection SLD - -

204RENEW POWER(Connected to Ittagi) 66 RENEW POWER

Visited recently.

Protection SLD - -

205CLEANMAXConnected to Ittagi) 66 CLEANMAX

Visited recently.

Protection SLD - -

206

SOE PVT LTD SOLAR (Connected to

Gathaprabha)110 SOE PVT LTD

Visited recently.

Protection SLD - -

207

ACME SOLAR ( Connected to

Halabarga)110 ACME SOLAR

Visited recently.

Protection SLD - -

208

GREENKO SOLAR (Connected to

Pavagada)220 GREENKO

Visited recently.

Protection SLD - -

209VENUS (Connected to Pavagada) 66 VENUS

No connectivity

from Pavagada - -

210DIAMOND (Connected to Pavagada) 66 DIAMOND

No connectivity

from Pavagada - -

211WELSPUN(Connected to Pavagada) 66 WELSPUN

No connectivity

from Pavagada - -

212

SARJAN RELAITIES LTD (Connected

to Guttur)220

SAJAN

RELAITIES LTD

Same as

HANUMANTAPP

A_WIND. Sl 161

- -

213

JK Cements (Connected to

Vajramathi)110 JK Cements

Less than 25MW.

Hence station is - -

214

SUZLON POWER INFRA PVT LTD _

GOPALAPURA220/33/0.69

SUZLON

POWER

Same

as GOPALPURA_S- -

Annexure-IV

Page 18 of 18

Minutes of the 62nd

Meeting of PCSC held on 15th

March, 2017 Page 3

With reference to above, the Constituents had been requested to submit the certificate on healthiness of batteries on monthly basis (i.e. status for a month shall be sent by the 7th day of the following month) to SRPC as per the format given below:

Sl. No.

Station Application Battery Battery Charger Remarks

Station Name

Code Type

(PS/ SS)

Protection/

Communication

Details Status (Healthy/ Unhealthy)

Details Status (Healthy/ Unhealthy)

1 Station-A Protection (Bank-1)

Protection (Bank-2)

Communication (Bank-1)

Communication (Bank-2)

2 Station-B …

… … …

Note: 1. Code is the short name of the Station

2. PS – Power Station; SS - Substation

The sought status for the months of January & February, 2017 had not been received from the following SR-Constituents:

Jan, 2017 TSGENCO (Hydro), KPTCL, PED & NLCIL

Feb, 2017 PED & JSWEL

7. Auto-Reclosure Implementation on all 220 kV & above transmission lines of

Southern Region

Majority of the faults that occur on transmission lines are of transient nature; hence provision of

Auto-Reclosure certainly helps not only in preventing forced outage of the subject transmission

line, but also in averting cascade trippings of adjacent transmission lines, in some cases, due to

consequent over-loading.

The provision for Auto-Reclosure is also mandated by Regulation 43 (4) (c) of CEA Technical

Standards for Construction of Electrical Plants and Electric Lines, 2010, which has force of law.

Therefore, it is in the interest of grid security that all Constituents implement auto-reclosure

feature on all 220 kV & above transmission lines in their respective control areas. Any exceptions

to this needed to be properly justified.

The issue was discussed in previous PCSC meetings where logics to be used for implementing A/R

had been clarified as follows:

Normal single-shot, single-ph A/R scheme (with simultaneous opening at both ends of feeder

with a dead-time of 1 sec and reclaim-time of 25 sec)

Time-Differentiated single-shot, single-ph A/R scheme [suitable for stations having concerns

relating to closing on to un-cleared fault, esp. Generators (Coal/ Gas/ Nuclear/ Hydro)]:

Annexure-V

Minutes of the 62nd


March, 2017 Page 4

“In this, after a line has been opened from both ends (generator end & grid end) on A/R operation, the grid end will be auto-reclosed as usual after the elapse of its dead-time (say, 1 sec). However, the generator end relay will check for the line voltage after elapse of an elongated dead time, say 1.5 sec [here the additional time delay of 0.5 sec, which has been included as a safety time margin, shall be chosen more than Zone-2 time delay & less than PDR time delay]. If the line voltage so sensed is healthy & normal (which implies that the fault has already been cleared), then generator end will be auto-reclosed; else 3-ph trip will be given at generator end to open the other two phase poles.”

It was also clarified that A/R implementation on lines connecting two generating stations is optional.

The issue was also discussed in TCC-30 & SRPC-31 meetings held on 24-25 February, 2017, and all Constituents agreed to furnish the detailed Action Plan for implementing A/R in their 220 kV & above voltage level transmission lines by next PCSC-62 meeting scheduled to be held on 15.03.2017.

In this regard, the status of implementation of A/R (excluding Radial feeders & Cables) as

furnished by SR-Constituents is as follows:

Sl.

No. Name of the Constituent

220 kV

400 kV 765 kV

Total no. of lines

No. of lines where A/R is in service

Total no. of lines


Total no. of lines


1 APGENCO 44 Nil 10 10 --- ---

2 APTRANSCO (Details not provided) Implemented in all

existing 400 kV lines

(Details not provided)

--- ---

3 TSGENCO

(Hydro)

15 Nil 5 Nil --- ---

TSGENCO

(Thermal)

16 Nil 6 6 --- ---

4 TSTRANSCO (Details not provided) Implemented in all

existing 400 kV lines

(Details not provided)

5 KPCL 50 16 11 11 --- ---

6 KPTCL 280 7 40 27 --- ---

7 TANGEDCO &

TANTRANSCO

239 138 22 22 --- ---

8 KSEB 61 52 --- --- --- ---

9 PED 6 6 --- --- --- ---

10 PGCIL (SR-I) --- --- 68 68 7 7

Annexure-V

Minutes of the 62nd


March, 2017 Page 5

11 PGCIL (SR-II) 15 15 92 92 2 2

12 NTPC

NTPC-Simhadri --- --- 8 8 --- ---

NTPC-Kudgi --- --- 4 4 --- ---

NTPC-

Ramagundam

4 Nil 10 10 (only for

main

breakers)

--- ---

A/R on 220 kV lines has not been provided as they are of very short length (1 km).

NTPC-

Kayamkulam

6 6 --- --- --- ---

13 NPCIL

MAPS 4 Nil --- --- --- ---

KGS 2 Nil 4 4 --- ---

A/R on 220 kV lines has not been kept in service as the remote ends are connected to

hydro power stations.

KKNPP 2 Nil 4 3 --- ---

BHAVINI 4 Nil --- --- --- ---

14 NLCIL 16 2 11 7 --- ---

15 JSWEL 2 Nil 2 2 --- ---

16 UPCL 2 Nil 2 2 --- ---

17 NTECL-Vallur --- --- 6 6* --- ---

Even though A/R has been implemented in all the six 400 kV lines, due to fibre optic

cable related issues between Vallur and NCTPS-II, A/R is effectively in service for 4

lines.

18 TPCIL --- --- 2 2 --- ---

19 CEPL --- --- 2 2 --- ---

20 HNPCL --- --- 2 2 --- ---

21 IL&FS --- --- 2 2 --- ---

22 Lanco KPL 2 Nil 2 2 --- ---

As the distance between Kondapally and VTPS Stage IV is only one span (350 mtrs),

A/R has been kept blocked from both the ends.

23 NTPL --- --- 2 2 --- ---

24 MEPL --- --- 2 1 --- ---

As 400 kV MEPL – SEL line, is a short line, A/R has not been kept in service on this line.

25 SEL --- --- 2 2 --- ---

Annexure-V

Minutes of the 62nd


March, 2017 Page 6

Action plan furnished by SR-Constituents for implementing A/R on the transmission lines, where it

is presently not in service.

Sl. No.

Constituent Action plan for implementing A/R

1 APGENCO (Philosophical Issues)

Auto-Reclose scheme for all 220 kV feeders of RTPP, Lower Sileru, Upper Sileru, Donkarayi & Srisailam RBPH of APGENCO are available but not commissioned since inception.

Dr. NTTPS (VTPS) 220 KV -- Auto-Reclose scheme for 9 feeders out of 15 feeders are available, but not commissioned since inception. For remaining 6 feeders, Static relays have to be replaced with Numerical relays to facilitate Auto-Reclose.

Details not provided.

2 APTRANSCO A/R scheme is implemented in all 400 kV network, and will be implemented for the latest & upcoming future 220 kV & above lines in APTRANSCO.

The details of availability and functioning of A/R scheme on the existing 220 kV network had been obtained from the field, and were being discussed with their management. The action plan would be furnished in next PCSC -63 meeting.

3 TSGENCO Details not provided.

4 TSTRANSCO For all the upcoming 220 kV & above feeders, the concerned wings have been requested to ensure A/R function and its implementation in the field.

The details of availability and functioning of A/R scheme on the existing 220 kV network had been obtained from the field, and were being discussed with their management. The action plan would be furnished in next PCSC -63 meeting.

5 KPCL In Sharavathy Generating Station, Auto re-close feature will be enabled after heightening the Towers of ST- 3 and S - 2 Line.

In Raichur Thermal Power Station, for 220kV lines, auto reclose feature is kept ready but disabled as per KPTCL guidelines.

In Nagjhari, Carrier aided protection wiring is in progress. The Auto re-close function will be enabled after completion of the Carrier aided protection wiring in consultation with KPTCL, RT Division.

In Kadra, Auto re-close feature is kept ready. However, the same is enabled in consultation with KPTCL, RT Division.

In Kodasalli, Auto re-close feature is kept ready. However, the same is disabled, since Lines are running between Power Houses.

6 KPTCL W.r.t. existing 400 kV lines, A/R has been implemented on all

lines.

W.r.t. existing 220 kV lines, retrofitting of Main-2 distance scheme in place of back up OC and EF relays in protection of 220kV lines is being taken up under R&U project, and awarded to M/s GE T&D India Limited. Along with Main-2 retrofitting works, Auto Reclosure scheme implementation will also be

Annexure-V

Minutes of the 62nd


March, 2017 Page 7

carried out for existing 220 kV lines. Works at 26 No.s of audited sub stations are taken up on top priority and planned to complete before 31.05.2017.

Further, A/R will be implemented in all future 400 kV & 220 kV lines.

7 TANGEDCO & TANTRANSCO

Details of 230kV Feeders in which A/R not enabled: 1. A/R not enabled in the following feeders for the reasons stated:

Generation connected feeders

76

Radial feeders 4 Cable feeders 6 Total 86

2. A/R to be provided in the following feeders:

Breaker problem

4 Breaker procurement is under progress and will be replaced with in one year.

Communication network to be provided

11 Pending due to non availability of Communication network and will be completed within 6 months.

Total 15

8

KSEB

Details of 220 kV feeders where A/R was not implemented are as follows:

Sl. No.

Feeder Name Status of A/R facility

Remarks

1 220 kV Kozhikode-PG – Areacode line-1

Short lines; Current Differential Protection provided; so A/R not provided.



4 220 kV Shornur – Areakode NIL Optical fibre link work under progress, SDH equipment under tendering, Protection coupler to be purchased. Expected to be commissioned during August 2017.

5 220 kV Brahmapuram – Cochin line-1

Not enabled Due to dangerous condition of multi-ckt tower auto-reclosing facility was kept in switched off condition. Will be enabled after completing the rectification work. The tower rectification work re-tendered.

6 220 kV Brahmapuram – Cochin line-2

Not enabled

7 220 kV Cochin – Kalamassery line-1

Not enabled

8 220 kV Cochin – Kalamassery line-2

Not enabled

9 220 kV New Pallom – Pallom line

Very short line; Pilot wire protection implemented; auto-reclosing facility not provided.

Annexure-V

Minutes of the 62nd


March, 2017 Page 8

9 NTPC - Ramagundam 400 kV lines (for Tie-CB’s): Details not provided.

10 NPCIL (Kudankulam NPP)

As agreed in SRPC meetings, A/R has not been kept in service from KKNPP end on 400 kV KKNPP – Madurai line.

Presently, A/R has not been kept in service on the TTPS bound 230 kV line as TTPS is a generating station.

The matter of providing A/R on SRPudur bound 230 kV line has been taken up taken up with NPCIL Management and the action plan for implementing the same will be furnished in by next PCSC-63 meeting.

NPCIL (MAPS) A/R on all four 230 kV lines would be put into service by July, 2017.

11

NLCIL 400 kV lines & 220 kV lines: Details not provided.

8 UPCL The A/R in 220 kV lines at UPCL end has already been configured and scheme is ready.

On completion of AR readiness at opposite end (Kemar) the A/R can be put in service.

9 JSWEL A/R functionality is available at JSWEL on both 220 kV JSWEL–

Lingapur lines. However, the same has not been kept in service due to (i) non-provision of the same from Lingapur end, and (ii) carrier protection issues.

In this regard, APTRANSCO and TSTRANSCO were requested to furnish details regarding status of implementation of A/R in their respective networks at the earliest.

Further, APGENCO, APTRANSCO, TSGENCO, TSTRANSCO, TANGEDCO, TANTRANSCO, NTPC (Ramagundam), NLCIL, NPCIL (KKNPP), UPCL, JSWEL were requested to furnish action plan for implementing A/R in their respective networks as high-lighted (in red-colour) above.

It was noted that the main issues in implementing A/R are the adopted conservative protection philosophies, lack of proper PLCC communication, and breakers’ suitability/ supportability. In this regard, it was clarified that if there are no issues w.r.t. carrier communication and breakers’ supportability, concerned Constituents shall make efforts to implement A/R immediately in their respective networks. Where communication & breaker related issues stand in the way of implementing A/R, concerned Constituents shall take steps to address them appropriately on priority basis, and implement A/R in their respective networks in a phased manner at the earliest.

8. Non-operation of SPS for Kudankulam NPP (KKNPP) Unit-2 on 23.02.2017

The following SPS, finalized in the 56th meeting of PCSC held on 03.08.2016, had been put into service by NPCIL to deal with the contingency of tripping of Units at KKNPP:

SPS for the Contingency of Tripping of Units at Kudankulam NPP

Contingency Action

Annexure-V

SOUTHERN REGIONAL POWER COMMITTEE

BENGALURU

Minutes of the Meeting of Protection System Analysis Group - 14 (PSAG-14) held

on 16th December, 2015 at MAPS, Kalpakkam

a) The Protection System Analysis Group (PSAG-14) meeting was held on 16th December, 2015 at

Madras Atomic Power Station (MAPS), Kalpakkam. Shri R. Satyanarayana, Chief Superintendent,

MAPS welcomed the members and participants. The List of Participants is enclosed at

Annexure - I.

b) MAPS on 230 kV side is equipped with 2x265 MVA, 230/16.5 kV GTs, 2x25 MVA, 230/7 kV SUT’s

four grid connected feeders, [viz., 230 kV MAPS – SP Koil line-1 (L-1); 230 kV MAPS – SP Koil line-

2 (L-2); 230 kV MAPS – Arani line (L-3); and 230 kV MAPS – Acharapakkam line (L-4)], two

radially connected feeders to IGCAR through 2x25 MVA, 230/33 kV transformers, and one

radially connected UG cable to BHAVINI. The station is equipped with two buses named Main

Bus and Transfer Bus. There is a bus sectionalizer on the Main Bus. Functionally, Station is

operating on Single Bus. The Station SLD is enclosed at Annexure-II.

c) S.P. Koil SS on 230 kV side is equipped with a Main bus and Auxiliary bus with Bus-coupler. There

are six feeders emanating from this substation, viz., MAPS - 1 & 2, Kalavindapattu, Veerapuram,

Oragadam, and Tiruvalam. Functionally, Station is operating on Single Bus. The Substation SLD

is enclosed at Annexure-III.

d) MAPS personnel delivered a presentation regarding the Grid Disturbance that occurred on

09.11.15.

The following issues were deliberated in the meeting:

A. Action taken by MAPS and TANTRANSCO w.r.t the recommendations given by the System

Studies Sub-Group of SRPC in its meeting held on 25.06.2014 (Minutes issued vide SRPC

letter no: SRPC/SE/ SG/2014/5885-86 dated 26.06.2014)

The compliance status of the said recommendations as informed to the PSAG-team is enclosed at

Annexure-IV.

B. Analysis of the Grid Disturbance that occurred at S.P. Koil & MAPS on 09.11.2015

It is brought out with concern that MAPS have not uploaded the copies of DR / EL / Numerical relay

indications / SoE in the required manner in to the web portal of SRLDC for detailed analysis. MAPS

confirmed that the same will be strictly ensured in future.

1. 230 kV Kalapakkam – Arani line (L3):

The line tripped at 18:28 hrs on 08.11.15 first on B-E fault (fault current 15.69 kA) due to DPR, Z1

operation at a distance of 62.74 m from MAPS. The line was kept holding from Arani end. As the line

was in charged condition from Arani end, MAPS personnel had tried to charge the line by closing the

Annexure-II

corresponding line-CB at 18:55 hrs. However, the line tripped again on B-E fault (fault current 15.39

kA) due to DPR, Z1 operation at 82.5 m from MAPS end.

Cause of the event: On field visit, it was observed the B-ph (RYB) Tension insulator at 1st tower

towards switchyard end got broken, and on impact over head conductor clamp at tower end got cut

and conductor had fallen on ground causing ground fault. It was found that the stem of ball-and-

socket assembly got fully corroded and pin got broken even for the moderate wind speed.

Action taken:

Line-3 was declared faulty and message given to TNEB for attending the fault. TNEB team arrived on

09.11.15 and replaced the tension insulator string with a new one and reconnected the conductor

using jumper. Line-3 was taken back in to service at 21:45 hrs on 09-11-2015.

Issue: Line tripped at MAPS end only, and was holding from Arani end.

Explanation: The snapping of conductor created a Ph-Ground fault for MAPS, and Open-conductor

fault for Arani. Due to this, even though protection at MAPS end acted in time to result in 3-ph trip

at MAPS and consequent sending of carrier to Arani end, protection at Arani end neither sensed the

fault nor received the carrier. Similarly, as the above fault resulted in 3-ph trip at MAPS, broken-

conductor condition could not be sensed by the protection at Arani end, even though the same has

been kept enabled for Alarm.

Accordingly, it is found that the operation of the protection system is in order.

2. 230 kV MAPS – Acharapakkam line (L4):

Line tripped at 08:21 hrs on 09.11.2015 on Y-B fault due to DPR, Z1 operation at a distance of 352

mts from MAPS end.

Cause of the event:

For line-4, the portion between MAPS 1st tower to 2nd tower after crossing main road for Y and B

phases got cut and fallen on ground on the road, obstructing movement of vehicle on main road. For

Y-phase, tension string insulator at 1st tower got cut, and on impact the conductor clamp at 1st tower

end got cut and conductor had fallen on ground. For B-phase, tension string insulator at 2nd tower

got cut, and on impact the conductor clamp at 2nd tower end got cut and conductor fallen on

ground. It was found that the stem of ball-and-socket assembly got fully corroded and pin got

broken even for the moderate wind speed.

Action taken:

Line-4 was declared faulty and message given to TNEB for attending the fault. On 1st tower, the

tension insulator string was replaced for Y phase, and the conductor was reconnected using jumper.

On 2nd tower, the tension insulator string was replaced with spare and conductor was reconnected

using a jumper. Line 3 was taken back in to service at 23:45 hrs on 09.11.20 15.

Accordingly, it is found that the protection system operated correctly.

3. 230 kV MAPs – SP Koil line (L2):

As per MAPS, the line tripped at MAPS end at 8:50 hrs on 09.11.2015 on B-E fault due to DPR, Z1

operation at a distance of 8.347 km from MAPS.

Annexure-II

As per TANTRANSCO, the line tripped at 9:06 hrs on 09.11.2015 on B-E fault due to DPR, Z2, Carrier-

Aided-Trip operation.

Issue: Even though the line tripped at 9:06 hrs, it could not be normalized till 10:45 hrs due to

apparent breaker problem at SP Koil end.

TANTRANSCO representative informed that there was a false SF6 gas pressure low alarm for

line-1 CB, which the operator mistook for line-2. As there was a heavy downpour accompanied

by strong winds outside, the shift personnel took time in mobilizing their resources to inspect

the switchyard and attend to the problem. Finally, the line was restored by 10:45 hrs.

It is noted that though the tripping of line is with correct operation of respective protection system,

the attempt for immediate trial charging could not be done due to misunderstanding of the Sub-

station operator during heavy rain. The situation could have been averted, had A/R been enabled at

both ends in line with CEA’s Technical Standards and insistence of SRPC forum in various PCSC

meetings.

4. 230 kV MAPS – SP Koil line (L1):

As per MAPS, the line tripped at 9:32 hrs on 09.11.2015 on Y-E fault due to DPR, Z1 operation at a

distance of 9.15 km from MAPS.

As per TANTRANSCO, on 09.11.2015 since 06:00 hrs the line-CB at SP Koil end on SP Koil – MAPS

line-1 was under lock-out due to Compressor’s low air-pressure. Subsequently at 09:32hrs., line fault

occurred in the above feeder; however the breaker had not tripped due to lock-out condition; as a

result, LBB relay acted and tripped all the 230kV feeders & all the four Auto-transformers. From the

DR furnished by TANTRANSCO, it was seen that LBB protection had taken 560 msec for its operation.

Issues:

The breaker of 230kV SP.Koil-MAPS feeder-1 at SP Koil end was under lock-out due to air-pressure lock-out of the compressor since 6:00 am on 09.11.2015, but no actions were taken at SP Koil end to rectify the same till the occurrence of the line fault at 9:32 hrs.

LBB protection acted with a delay of 560 msec.

TANTRANSCO representative informed that due to shorting of supply cable to Compressor

motor, air pressure lock-out occurred for Compressor.

The fault current had persisted for 560 msec due to sluggish operation of LBB relay, and the

matter was taken up with their OEM and would soon revert on the action taken.

In this regard, TANTRANSCO is recommended to provide (i) separate alarm window for Air

Pressure & SF6 Pressure indication in the Sub-station (SP Koil) Control room, and (ii) Standby

Compressor arrangement in all critical sub-stations like SP Koil.

5. Tripping of both Units at MAPS:

With the tripping of Acharapakkam line (L-4) at 8:20 hrs on 09.11.2015, Reactors’ power was

reduced in both units by 5%. Currents on lines 1, 2, 3, and 4 were monitored and maintained at

(400/360/0/0) AMPS respectively.

Subsequently, when the SP Koil line-2 (L-2) also tripped at 9:02 hrs on 09.11.2015, the current on

the only remaining line (L-1) shot up to over 500 A due to which both Units’ small dump valves

Annexure-II

opened; as a result, generation got reduced to 130 / 112 MW (e) and line current on L-1 was

brought down to 480 Amps.

Finally, when the only evacuating line, viz., SP Koil line-1 (L-1) also tripped at 9:32 hrs, both units got

tripped on high frequency and total class IV failure. Both Reactors also got tripped on high boiler

delta-T.

From the above, it is observed that had one Unit been withdrawn on tripping of three evacuating

lines, the station could have survived on house load with one Unit in service during the loss of

evacuation of the station (i.e., during tripping of the fourth line). Therefore, for the survival of the

nuclear station, it is always advised to ensure generation level of MAPS without compromising (n-1)

condition of evacuation system.

C. General Operational & Protection Issues pertaining to MAPS in the context of the Grid

Disturbance that occurred on 09.11.2015

1. Replacement of Disc type string insulators on all the 230 kV lines emanating from MAPS.

It is seen that Arani & Acharapakkam lines tripped due to the failure of disc type string insulators of

the 230kV towers at MAPS end due to wear of ball and socket assembly on corrosion. Also there are

more no. of jumpers existing on lines 3 & 4 at first & second towers from MAPS end.

To this, TANTRANSCO informed that for the total 688 towers, 159 cut joints had already been

replaced. The work relating to replacement of disc type string insulators by polymer type at all

tension towers is already under progress, and will be completed by April, 2016. The action plan for

the same at all suspension towers will also be furnished shortly.

In this regard, TANTRANSCO is recommended to furnish their comprehensive plan for replacing

disc insulators by polymer type at all tension and suspension towers on all the 230 kV lines

emanating from MAPS before the 50th Protection Co-ordination Sub-Committee (PCSC) meeting

scheduled to be held on 27th January, 2016.

2. Improving the flow/ exchange of information between MAPS and TANTRANSCO substations for

the faults occurring on the connecting lines.

Between the trippings of MAPS – SP Koil line-2 (L2) at 9:06 hrs and SP Koil line-1 (L1) at 9:32 hrs on

09.11.15, it is seen that due to delay in exchanging proper information on the fault data, opportunity

has been lost in taking the necessary remedial action to bring back MAPS - SP Koil line-2 into service.

As the shift personnel at SP Koil end were under the impression that the line CB was under lock-out

due to SF6 pressure low, proactive action was not initiated even though MAPS personnel had tried to

contact them over phone. It is seen that even though MAPS was already operating under depleted

network conditions at the time of tripping of SP Koil line-2 [due to tripping of MAPS – Arani line (at

18:28 hrs on 08.11.2015) and MAPS – Acharapakkam line (at 08:21 hrs on 09.11.2015)], concerned

shift personnel have not shown the alertness required in handling the distressed system. It was

emphasized that to avoid similar incidents in future, better vigilance and alertness need to be

exercised by the shift personnel.

Annexure-II

In this regard, it is agreed by MAPS and TANTRANACO that whenever any fault takes place on the

transmission lines between MAPS and TANTRANSCO substations, the relevant fault data, viz.,

location, zone, magnitude and phase of the fault current will be mutually exchanged, within 10 –

15 minutes. Parallelly, the concerned shift personnel will also put efforts to get first hand

information on the condition of the equipment involved by physically inspecting the yard. Thus

both the ends shall ensure trial charging of the line within 15 (Fifteen) minutes of tripping of the

element, if the tripping was on single phase fault.

3. Providing dual AC supply to Compressor Motor and redundant Compressor Unit.

It is seen that the lock-out of the SP Koil end line-CB on the MAPS – SP Koil line – 1 (L1) happened due

to air lock-out of the Compressor unit, which in turn occurred because of the failure of the

Compressor Motor due to shorting of its supply cable. Had the redundancy been provided to the

supply to the compressor motor and/ or the Compressor unit, the breaker’s lock-out could have been

prevented.

In this regard, TANTRANSCO is recommended to provide (i) dual AC supply to Compressor unit of

the CB’s, and (ii) a redundant/ standby Compressor unit that would automatically takeover in case

the main unit stops functioning at SP Koil end for the CB’s on the MAPS-bound lines 1 & 2.

As SP Koil is essentially on single-bus operation, the issue of providing bus-sectionalizer CB was also

discussed. To this, it was informed that as SP Koil was a very old station, there was no space available

to make way for bus-sectionalizer. TANTRANSCO is advised to consider the possibility of providing

bus-sectionalizer breaker arrangement during renovation.

It was also noticed that DG-set had been kept in manual mode during tripping event at SP Koil. As

this is not desirable for handling emergency situations, TANTRANSCO is recommended to keep DG

set always in auto-mode at its SP Koil SS.

4. Carrier communication/ PLCC related issues on 230kV MAPS-Arani line (L-3).

It is noted that MAPS have not provided any relevant files like Event Logger and Disturbance

Recorder to verify the issues relating to carrier communication on 230 kV MAPS – Arani line.

However, to ensure healthiness of carrier communication on L-3, the following is recommended to

be carried out by MAPS and Arani SS personnel in coordination:

Healthiness of PLCC system components (hardware and software) at both ends shall be

checked and faulty components shall be repaired/ replaced.

End-to-end communication for DT/ permissive & other signals may be ensured by testing at

both the ends.

5. Status of providing Line CVT’s in the Y phase of all feeders excepting SP Koil-2.

This is one of the recommendations given by the audit team that carried out protection audit of

MAPS switchyard in the year 2012. TANTANSCO informed that the procurement of line CVTs had

been completed, and line CVT’s would be commissioned soon. To this, TANTRANSCO was requested

to furnish the schedule of commissioning of line CVT’s before the 50th PCSC meeting scheduled to be

held on 27th January, 2016.

Annexure-II

6. Provision of Auto-reclosure (A/R) on all 230kV lines emanating from MAPS.

TANTRANSCO informed that though A/R is available at their end on all evacuating lines of MAPS, the

same was not put into service in view of MAPS decision to not to provide A/R at their ends.

MAPS informed that due to the possibility of damage to/ reduction in life of turbine and generator

rotor, NPCIL management have decided not to keep A/R in service on all 230 kV lines emanating from

their Nuclear stations.

It is noted with concern that in spite of the CEA’s mandated requirement of providing auto-reclose on

all 220 kV/ 230 kV lines, and the earlier recommendation of sub-Group which held its meeting on

25.06.2014 to that effect, A/R has not been put into service on any of the four evacuating lines of

MAPS by TANTRANSCO as well as MAPS at their respective ends.

In this regard, SRLDC mentioned that either single phase A/R scheme or three phase A/R scheme as

felt appropriate by MAPS can be implemented at MAPS end. However, if MAPS feels that attempt for

A/R is to be prevented strictly from MAPS end, then a ‘Lead-Follow’ three phase A/R scheme could

be followed by MAPS to comply with CEA’s standards and maintain grid discipline. It was explained

that the proposed lead-follow A/R scheme would effectively take care of chances of generating end

closing on to a permanent fault. In this master-follower A/R supervision scheme, the grid-station end

would reclose first, and send a permissive-signal to the generating end on successful auto-reclosure.

By ensuring that the generating end would reclose only after the receipt of the permissive signal

from the remote end after a predetermined time (say 1.5 sec, this shall be less than the pole

discrepancy relay operation time), the chances of it closing on to a permanent fault can be

eliminated. In the event of non-receipt of carrier signal, the generating end can go for 3-ph trip. In

this regard, the Topic 6.1 on Common Considerations for Auto-reclosing of the IEEE Guide for

Automatic Reclosing of Line Circuit Breakers for AC Distribution and Transmission Lines may be

referred to. It was reiterated that as providing auto-reclose on all 220 kV/ 230 kV lines is mandatory

under Regulation 43 (2) (c) of CEA’s “Technical Standards for Construction of Electrical Plants &

Electric lines”, action plan for providing A/R on all 230 kV evacuating lines of MAPS has to be

provided by MAPS.

It is therefore recommended that MAPS shall take up the issue of providing lead/follow A/R

scheme on its 230 kV evacuating lines with their Management and present their action plan for

implementing the same before the 50th meeting of PCSC scheduled to be held on 27th January, 2016.

7. Ensuring Grid Connectivity of MAPS.

MAPS informed that the following mechanism exists at MAPS to bring down generation in case of

tripping of evacuating lines of MAPS:

When two of the four evacuating lines go out, 5% reduction in generation output is effected.

It was, however, informed that due to the limitation imposed by nuclear reactor’s controls, such

reduction can at most be sustained for a period of 30 minutes before which requisite action

should be taken to bring back lines into service, lest the reactors may get poisoned out.

Under these conditions, when one more line goes out, and the flow on the only remaining line

crosses 500 Amps, generation output is further reduced to 130/112 MW in each Unit by venting

Annexure-II

out the excessive steam (by opening small dump valves), and the current will be brought down

to 480 Amps.

It was, however, informed that such operation can be entertained for at most 15 minutes before

which requisite action should be taken to bring back lines into service, lest the reactors may get

poisoned out.

At MAPS, the power from 2x220 MW Units is being evacuated through the following four

evacuating lines (Kunda type conductors with 213 MVA rating), viz.,

(i) 230 kV MAPS – SP Koil line-1 (L-1);

(ii) 230 kV MAPS – SP Koil line-2 (L-2);

(iii) 230 kV MAPS – Arani line (L-3); and

(iv) 230 kV MAPS – Acharapakkam line (L-4).

In addition to above, there is one radially connected Under Ground (UG) Cable to BHAVINI to supply

start-up and commissioning power to BHAVINI. The cable has been provided with line differential

protection as primary protection and over current and earth fault protections as back-up

protection.

From the above, the non-availability of (n-1) when two of the four evacuating lines get tripped is

quite apparent. To provide (n-1), the combined generation of two Units has to be brought down to

200 – 210 MW. However, as brought out above, the generation can only be brought down to 130/

110 MW in each Unit (thus 260/220 MW in total) by resorting to extreme contingency measure of

venting out excessive steam, which operation can be sustained for at most 15 minutes without any

of the Reactor’s getting poisoned out. Moreover, once such a thing happens, it takes one-to-three

days to bring Units back on to bars.

It was therefore originally proposed to utilize the existing UG Cable between MAPS and BHAVINI to

its fullest capacity by connecting it to the grid at BHAVINI. However, considering its rating (133 MVA

or 106 MW), it can be seen that (n-1) will not be fulfilled even after connecting this Cable to grid

when MAPS operates with two evacuating lines.

Considering the above limitations, and the need to ensure better connectivity of MAPS to grid, it is

proposed to lay a Single-Circuit Over-Head Transmission Line with Twin-Moose type Conductor

along the RoW of the present UG Cable. As the distance between MAPS and BHAVINI is only 800

mts., the proposed S/C over-head transmission line would be the ideal solution in the long-term to

evacuate power from MAPS with (n-1) even after losing the two out of the four existing evacuating

lines. MAPS and BHAVINI are therefore recommended to examine this proposal, and, after

obtaining the consent of their respective managements, are requested to approach SP&PA

Division of Central Electricity Authority to get the scheme ratified in the Standing Committee on

Power System Planning for Southern Region (SCPSPSR) for implementation. Till such time, MAPS

is recommended to maintain the generation level such that the line loading of available

evacuation system will always satisfy the requirement of ‘n-1’ criteria. In the process, if the

situation requires withdrawing one of the two Units, the same may be followed by MAPS to avoid

tripping of both Units on loss of evacuation.

Annexure-II

The necessary system studies to make out a strong case for the above proposal have been carried

out, and are presented at Annexure-V. The assumptions made and the scenarios considered for

the above studies are detailed below:

Assumptions made/ Data considered:

(i) The following UG Cable characteristics as informed by BHAVINI have been considered:

Sl. No.

Description Value

1 Rating Voltage: 230 kV (Max. 245 kV) Current: 850 A in air 646 A in duct 335 A when directly buried in ground [Cable is directly buried in ground]

2 Length of the Cable 3 runs of 800 mt. cable

3 Conductor Max. DC Resistance per km

(i) At 20°C 0.047 Ω/ km (ii) At 90°C 0.0614 Ω/ km

4 Positive & Negative sequence reactance per km 0.0614 + j 0.195

5 Zero sequence data per km 0.0117 + j 0.133

6 Protection equipment rating at both ends of the Cable VT – 100 VA; CT – 30 VA

(ii) Share of various States in BHAVINI’s first Unit of 500 MW capacity has been considered as

follows:

(iii)Expected commissioning schedule of the first Unit of BHAVINI (of 500 MW capacity) has been

taken as September, 2016.

(iv)The Ex-bus generation considered for MAPS and BHAVINI are 2x200 MW and 1x450 MW

respectively.

(v) For the studies with & without generation at BHAVINI, present operational base-case only has

been considered, as the effect of transmission elements that would get added to the grid by

September, 2016 would be minimal on the existing 230 kV network in & around MAPS.

Andhra Pradesh + Telangana 132 MW

Karnataka 72 MW

TamilNadu 167 MW

Kerala 43 MW

Puducherry 11 MW

Unallocated Power 75 MW

Annexure-II

Various Scenarios considered:

Sl. No.

CASE No. Scenario considered Line flow violations

1 Base Case (BC) MAPS with L1, L2, L3 & L4 in service NIL

2 CASE-1 BC + Outage of [L1] NIL

3 CASE-2 BC + Outage of [L1 + L3] 235 MW on L2

4 CASE-3 BC + Outage of [L1 + L3 + L4] 400 MW on L2

5 CASE-4 (BC1) BC + 230 kV MAPS – BHAVINI Cable NIL

6 CASE-5 BC1 + Outage of [L1] NIL

7 CASE-6 BC1 + Outage of [L1 + L3] NIL

8 CASE-7 BC1 + Outage of [L1 + L3 + L4] 320 MW on L2

9 CASE-8 [= New Base Case (NBC)]

Base Case (BC) + 450 MW generation at BHAVINI

NIL

10 CASE-9 NBC + Outage of [L3] NIL

11 CASE-10 NBC + Outage of [L3 + L2] 215 MW on L1

12 CASE-11 NBC + Outage of [L3 + L2 + L1] 400 MW on L4

13 CASE-12 (NBC1) NBC + 230 kV MAPS – BHAVINI Cable NIL

14 CASE-13 NBC1 + Outage of [L3] NIL

15 CASE-14 NBC1 + Outage of [L3 + L2] 209.6 MMW on L1

16 CASE-15 NBC1 + Outage of [L3 + L2 + L4] 363.3 MW on L1

17 CASE-16 (BC2) Base Case (BC) + 230 kV MAPS – BHAVINI Twin Moose S/C line

NIL

18 CASE-17 BC2 + Outage of [L1] NIL

19 CASE-18 BC2 + Outage of [L1 + L2] NIL

20 CASE-19 BC2 + Outage of [L1 + L2 + L3] NIL

21 CASE-20 BC2 + Outage of [L1 + L2 + L3 + L4] NIL

22 CASE-21 (NBC2) Base Case (BC) + 450 MW generation at BHAVINI + 230 kV MAPS – BHAVINI Twin Moose S/C line

NIL

23 CASE-22 NBC2 + Outage of [L1] NIL

24 CASE-23 NBC2 + Outage of [L1 + L2] NIL

25 CASE-24 NBC2 + Outage of [L1 + L2 + L3] NIL

26 CASE-25 NBC2 + Outage of [L1 + L2 + L3 + L4] NIL

Annexure-II

Short Circuit Studies for various scenarios have also been carried out and tabulated below:

Since both MAPS and BHAVINI stations have been designed for a Short Circuit Level of 10,000 MVA, it

can be concluded from the above that laying of Twin-Moose type S/C Over-Head transmission line

between MAPS and BHAVINI poses no problem.

8. Furnishing of tripping details in compliance of Regulation 5.2 (r) of IEGC, and providing monthly

status of healthiness of batteries

MAPS’s attention has been brought to their obligation of fulfilling requirements under Regulation

5.2 (r) of IEGC, as per which all Users, STU/ SLDC, and CTU are required to furnish for analysis

purpose the relevant information relating to tripping events in their system along with Disturbance

Recorder (DR) and Event Logger (EL) to SRLDC/ SRPC within 24-hrs of occurrence of the same. Though

this issue was regularly brought to Constituents’(including MAPS) attention vide various SRLDC &

SRPC (fort-nightly) letters, still data w.r.t. all events was either not being furnished or being made

available with unacceptable delay of few weeks.

MAPS is recommended to upload various tripping files (FIR/ DR/ EL/ TR) whenever any tripping

involving their station takes place in SRLDC’s web-portal within 24-hrs of the occurrence of the

tripping event in compliance of Regulation 5.2 (r) of IEGC.

9. Patrolling Protocol/Guidelines for Over Head Transmission Lines:

SRPC brought to the notice of TNEB regarding the Patrolling Protocol/Guidelines for Over Head

Transmission Lines to be followed by them. It was noted that in compliance of Hon’ble CERC Order

dated 20.02.2014 in respect of Petition No. 146/MP/2013 wit IA 36/2013, Patrolling

Protocol/Guidelines for Over Head Transmission Lines had been formulated by SRPC Secretariat in

due consultation with all the stake holders and the same had been communicated to Hon’ble CERC

and all the Transmission Utilities (Central/State) vide SRPC letter dated 21.05.2014 with a request to

strictly follow the guidelines. It was noted that as per Guidelines, each transmission utility should

furnish the Annual Schedule of Patrolling to SRPC/SRLDC along with Annual Outage data by October

each year and compliance report of the patrolling/maintenance carried out during previous month

with respect to schedule would be furnished to SRLDC/SRPC in the OCC Meeting.

TANTRANSCO agreed to follow the same and requested SRPC to kindly furnish a copy of the

Patrolling Protocol/Guidelines for Over Head Transmission Lines to help in their needful action. In

this regard, a copy of the sought Guidelines is enclosed at Annexure-VI.

Annexure-II

10. Line Clearance issues:

The following suggestions/recommendations given by the System Studies Sub-Group of SRPC which

held its meeting on 25.06.2014 regarding line clearance were reiterated:

Information regarding the lines kept open in MAPS vicinity to be informed to MAPS. Restoration

of the same also may be informed pertinently.

If any line clearance (LC) is there in downstream/upstream MAPS area for maintenance, then

further opening of the lines which may cause non availability of evacuation lines from MAPS have

to be restricted for avoiding undesired island formation of MAPS generation with TANTRANSCO

loads/House Load operation of MAPS Units / Poisoning of Units etc.

11.Providing information relating to line outages and Declared Capacity (DC) revision in case of

generating Unit outages

SRLDC mentioned with concern that revision of DC by MAPS is not being done by MAPS as and when

there is tripping / synchronization / change in level of generation. This lead to operational difficulties

as well as huge financial implication on the constituents when the corrections were incorporated

post facto. MAPS assured for necessary action in this regard and strict compliance in future.

The issue of not providing proper information to SRPC/ SRLDC regarding line outages and in case of

line outages by TANTRANSCO was also discussed. TANTRANSCO assured that they would take

effective steps to ensure that such lapses won’t take place.

*****

Annexure-II

auto reclosure shall be blocked for faults in the cables.” under para 15.3, it was also mentioned...

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