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SOUTHERN REGIONAL POWER COMMITTEE BANGALORE

MINUTES OF THE 15th MEETING OF PROTECTION SUB- COMMITTEE OF SRPC HELD ON 18.07.2012.

1. INTRODUCTION

1.1 The 15th meeting of Protection Sub-Committee was held on 18th July

2012 in the Conference Hall of Southern Regional Power Committee,

Bangalore. The list of participants for the PCC meeting is enclosed as

Annexure-I.

1.2 Shri S.R.Bhat, Member Secretary (I/c), SRPC welcomed the new members and

participants to the 15th meeting of the Protection Sub-Committee. He informed

the forum about the deliberations of the Spl meeting of PCC held at Kaiga on

30.04.2012 and also the recommendations made during the Spl meeting of

PCC held on 19.04.2012 to discuss the partial grid disturbance on 03.04.2012.

He also informed the forum regarding the recommendations finalized during 1st

Monitoring Committee of the PCC which was held on 06.06.2012.

1.3 MS (I/c) also informed the forum that a special meeting of PCC was scheduled

to held in the afternoon session to discuss the 400 KV Vijayawada Nellore

SPS Scheme. Member Secretary (I/c) requested Shri Satbir Singh, SE to take

up the Agenda items for discussions.

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2. CONFIRMATION OF THE MINUTES OF THE 14th PROTECTION

SUB- COMMITTEE MEETING HELD ON 21st March 2012.

The Minutes of the 14th Protection Sub-Committee Meeting were confirmed

since no comments were received from the constituents.

3. SYSTEM DISTURBANCES

The System Disturbances / Occurrences in the Southern Region i.e. Grid

Disturbances, Grid Incidents occurred during the period from February 2012

to May 2012 were discussed in the meeting.

4. Grid Disturbances

4.1) Grid Disturbance on 3rd April 2012 in Karnataka System.

(i) Time and date of event : 3rd April 2012 at 11.02 Hrs (ii) Location : North Karnataka

(iii) Plant and/or Equipment directly involved :

North coastal Karnataka and 400 kV Guttur SS, 400 kV Kaiga SS, 400 KV

Narendra and Nagjheri, Kodasalli, Kadra, Kaiga, Narendra, Hubli, Bidnal,

Guttur and Ambewadi S/S became dead.

(iv) Description and cause of event

At 11:01 Hrs, due to a suspected momentary DC grounding of the isolator

NO/NC contact wires running from individual bay bus selection isolator to

400kv bus bar protection relay panel, Bus bar protection relay operated at

400kV Guttur.

(v) Antecedent conditions of load and generation, including frequency,

voltage and the flows in the affected area at the time of tripping

including Weather Condition prior to the event

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Prefault Scenario

The status of 220 kV lines were as follows.

a. Bidnal-Soundatti line was open at Bidnal.

b. Haveri 1 & 2 lines were open at Narendra.

c. Vajramatti- Mahalingapura 1 & 2 were open at Vajramatti.

d. Kadra- Kodasahalli was under LC.

e. Narendra-Ambewadi 1 & 2 were under LC.

f. NPH (Nagjhari)-Ambewadi-1 was under LC.

Generation at NPH - 715 MW

Generation at Kaiga - 600 MW

Generation at Kadra - 90 MW

Generation at KShally - 101 MW

Generation at Jindal - 741 MW

Generation at BTPS - 366 MW

Load on Bidnal – Harthi 1 & 2 - 97 MW each

Hubli-Sirsi 1 & 2 - 22 MW each

Guttur bus was handling about - 1212 MW

NPH

KSHally

Kaiga

Kadra

Bidnal

Narendra Goa

A.wadi

Hubli

Gadag

Lingapur Harti

MLPur

Soundattti

Sirsi

Guttur

SGS

Vajramatti

Haveri

Hiriyur

JSW

BTPS

RTPS

Munirabad Alipur

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(vi) Demand / Generation interrupted

Generation Loss- 2200 MW and Load Loss – 2000 MW

(vii) Sequence of trippings with time.

At 11:02 hrs:

a. Guttur 400 kV bus became dead because of mal-operation of bus bar

protection relay due to DC ground.

b. The units at Kaiga went on to house load. 400 kV & 220 KV switch yard got

de-energized. Hence Narendra 400 KV bus became dead.

c. The load on Bidnal-Harti 1 & 2 lines increased to about 350 MW each from

97 MW and tripped on over load.

d. This caused the increase in loading of Hubli-Sirsi 1 & 2 lines to 240 MW

each from 154 MW and tripped on over load.

e. This created an island of 220 KV systems including the generating stations

Nagjhari, Kadra & KS Hally and the substations Hubli, Bidnal, Narendra

etc.

f. The frequency in this islanded area increased and the units at Nagjhari,

Kodasahalli & Kadra tripped on over speed and the bus became dead at

the above stations.

g. 400 KV RTPS-BTPS tripped on over voltage at BTPS and BTPS- Jindal

tripped at Jindal. 220 kV BTPS-Lingapur tripped on over load.

h. The lone 220 kV BTPS-Alipura line carrying 73 MW and the unit ramp

down to 73 MW survived at BTPS. At BTPS, when Lingapur line was

charged, all the lines and unit tripped immediately.

(viii) Remedial measures/Restoration

a. Supply was resumed to Nagjhari from Sirsi via Harthi and subsequently

units and lines were charged at 11:40 Hrs.

b. Supply was resumed to Kaiga from Hiriyur via Guttur and subsequently

units and lines were charged at 11:47 Hrs.

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c. Start up power for BTPS was extended from JSWEL.

DELIBERATIONMS IN THE PCC:

• It was informed to the forum that this incident was discussed in detail

during the special meeting of PCC held on 19.04.2012 in SRPC

Secretariat, Bangalore.

• The recommendations of the Spl meeting PCC forum would be discussed

in detail in item No 35.

4.2) Grid Disturbance on 18th April 2012 at NLC.

(i) Time and date of event : 18th April 2012 at 09.23 Hrs (ii) Location : Neyveli ,Tamilnadu


Neyveli TPS-2 400 KV Sub station


At 09:23:39 Hrs, due to internal fault in the B-phase SF6 CT of

400 KV Neyveli-TPS- Puducherry line, SF6 pressure had come down to

zero and feeder got tripped. During the auto reclosing at 09:23:40 Hrs

both the 400 KV buses got cleared on Bus bar protection.

Neyveli TPS 2 Stage II Units 4, 5, 6 & 7 went on house load and

400 KV Neyveli TPS 2 buses (Double Main one Transfer Bus scheme)

became dead.

(v) Demand / Generation interrupted

Generation Loss- 850 MW

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(vi) Details of Relay Operation :

86 C, 86 T, 86 TX, 85 LO Num Relay- B Ph Zone-1 operated Auto reclose operated carrier send SF6 CT alarm relay (Both stage-1 & stage-2)

(vii) Restoration:

1. Immediately after the incident, Restoration process started and 400/230

KV ICT 2 was closed at 09:44 hrs & 400 KV Neyveli TPS 2 – Salem 1

line was closed at 09:57 Hrs to enable the restoration of house load

units to the bar.

2. At 10:08 Hrs, 400/230 kV ICT 1 was closed.

3. At 10:09 Hrs, 400kV Neyveli TPS 2 – Trichy line was closed.

Subsequently, Neyveli TPS 2 Stage II Unit 5 & Unit 6 normalized from

house load at 10:12 Hrs & 10:14 Hrs respectively.

4. At 10:21 Hrs, 400kV Neyveli TPS 2 – Salem 2 line was closed.

5. At 10:43 Hrs, 400kV Neyveli TPS 2 – Neyveli TPS 1 (Exp) line was

closed. Subsequently, Neyveli TPS 2 Stage II Unit 7 normalized from

house load at 10:47 Hrs.

6. At 10:48 Hrs, 400kV Neyveli TPS 2 – Pugalur line was closed.

7. Neyveli TPS 2 Stage II Unit 4 could not able to normalized from house

load & later taken out on water wall tube leakage.

DELIBERATIONS IN THE MEETING

• CM, NLC informed the forum that NLC had purchased a new CT from M/s

Siemens and they sought the manufacturer’s detailed report regarding the

above incident.

PCC RECOMMENDATIONS

v The forum recommended NLC to send a detailed analysis report of the

incident to the PCC forum.

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4.3) Grid Disturbance on 27th April 2012 in the Karnataka System.

(i) Time and date of event : 27th April 2012 at 17.45 Hrs (ii) Location : Guttur, Karnataka


400 KV Guttur Substation


A Bus fault occurred at 400kV Guttur SS due to flashover of B-phase

Lightening Arrester of 400kV Guttur-Hiriyur-Line 2. Bus bar protection

operated and all 400 KV feeders got tripped along with 400/220 KV ICTs.

(v) Antecedent conditions of load and generation, including frequency,

voltage and the flows in the affected area at the time of tripping

including Weather Condition prior to the event

Prefault Scenario:

400 kV Bus Guttur

JSW

2200kV bus

Hiriyur PGCIL 2 X 229MW

178MW

383MW

Total Load – 636 MW

2 X 315 MVA

Munirabad

70MW

Narendra

2 X 13MW

Kaiga

2 X 79MW

R-Ph LA flashed

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(vi) Demand / Generation interrupted

Generation Loss- 415 MW

(vii) Sequence of trippings with time.

a. At 17:44:55 Hrs on 27th April 2012, the R-phase LA of 400 kV Hiriyur line-II

flashed over at 400 kV station Guttur.

b. The line immediately tripped (Single pole tripped) on distance relay, R-N,

(MiCOM-P442), zone-1, and fault current R-N 12 kA. Single pole A/R

operated and again tripped (Three pole tripped) on distance relay, SOTF, R-

N, (MiCOM-P442), zone-1, fault current R-N 11KA.

c. Before tripping of line on distance relay after auto reclosing, the bus bar

protection relay mal-operated and tripped all 400 KV lines and ICTs causing

400 kV bus shutdown at Guttur.

(viii) Restoration:

18.00 Hrs. - 315 MVA ICT-II charged.

18.04 Hrs. - 400kV Beeranahalli-I (Hiriyur) charged.

18.10 Hrs. - 400kV Narendra-I charged.

18.17 Hrs. - 400kV Kaiga-I charged.

18.19 Hrs. - 400kV JSWEL charged.

18.21 Hrs. - 315 MVA ICT-I charged.

18.28 Hrs. - 400kV Munirabad charged.

18.41 Hrs. - 400kV Narendra-II charged.

18.47 Hrs. - 400kV Kaiga-II charged.


• KPTCL informed that the bus bar differential relay was tested after the

occurrence and found to be in order. However, the upgradation of the

existing bus bar protection is also proposed.

• The flashed over LA of 400 kV Hiriyur line-II was replaced on 28-04-2012

and the line was charged at 22:00 Hrs on 28-04-2012.

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PCC RECOMMENDATIONS

v The PCC forum recommended KPTCL to forward the detailed report from

KPCL regarding tripping of BTPS units.

4.4) Grid Disturbance on 25th June 2012 in Karnataka System.

On 25.06.2012 at 03:24 Hrs 220kV Lingapur SS got tripped. The forum

requested KPTCL to send the detailed analysis of the incident with the details

as mentioned in the IEGC 5.9.6 (c)

The forum also requested KPTCL/SLDC to demand for the detailed report

from BTPS and the same may be forwarded to the SRPC, Secretariat at the

earliest.

The forum opined that the Grid disturbance would be discussed in the next

PCC.

PCC RECOMMENDATIONS

The PCC forum recommended that Bus bar protection at Lingapura S/S

may be implemented within 6 months time to avoid the grid disturbance

similar to 25.06.2012.

4.5) Grid Disturbance on 30th June 2012

Date and Time: 30-Jun-2012 & 12:59:12 Hrs

Reported Disturbance/Fault:

CT Blast on 400kV Gazuwaka-Kalpakka-1 at Gazuwaka end.

The forum requested PGCIL, SRTS II to send the detailed analysis of the

incident with the details as mentioned in the IEGC 5.9.6 (c)

The forum opined that the Grid disturbance would be discussed in the next

PCC.

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5. Talcher – Kolar HVDC Poles Trippings:

5.1 Tripping of Pole I and Pole II on 22.04.2012 at 14:32 Hrs due

to Commutation failure

a.The incident report as submitted by SRTS II, PGCIL is as follows.

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b. The Grid incident report as submitted by SRTS II,PGCIL as

follows.

SRTS-II,PGCIL REPORT ON BIPOLE TRIP ON 22.04.2012 (i) Pre fault Condition

On 22.04.2012 both Poles were in service with Bipolar power of 2000 MW on AC

side of Talcher. At Kolar, Pole 1 & Pole 2 power was 915 MW each. Bus

frequency was 49.7 Hz.

(ii) During fault:

At 14:32 hrs, Pole1 & Pole 2 have tripped due to ESOF from other side. At

Talcher it was observed that Pole control has generated ESOF for both Poles.

The Pole current was limited due to Low Short Circuit Ratio on HVDC. Both

Poles have tripped almost simultaneously with a delay of 65msec. Both Poles

have remained in Block condition at Kolar & under standby at Talcher. AC Filter

bank 1 has tripped on Over voltage stage -1 (delay of 1 sec). On initial analysis

of SER, it was observed that there were several commutation failures in both

Poles. AC frequency has dropped to 48.8Hz.

(iii) Analysis for Operation of HVDC:

On detailed analysis of the events and the TFR recordings, it is observed that

there were repeated commutation failures on both Poles at Kolar. Pole 1 & Pole

2 has experienced 7 commutation failures each. As per design of HVDC controls,

the protection inherent to Pole control detects reduced short circuit level by

repeated commutation failures. If a commutation failure is detected for the

affected pole, a monitoring time (1 min.) is started and a counter is incremented.

If the counter reaches a first limit (3) during this time period, the respective pole

current limit is decreased to 75% (Stage 1). As soon as a second limit (6) of

commutation failures is reached within the monitoring period, a further decrease

to 50% is initiated (Stage 2). If after a delay (Pole 1: 200 ms, Pole 2: 400 ms)

again a commutation failure is detected, the pole is finally tripped (Stage

3).Extinction angle (Gamma) values lower than a certain limit (3°) in the affected

pole is the indication criteria for commutation failure detection. It is observed that

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the 400kV Bus voltages at Kolar have reduced to as low as 266kV, 285.7kV &

243.95kV in R,Y &B phases respectively. These are the minimum voltages seen

from TFR at Kolar bus.

The disturbance has lasted for 1.2sec as seen from the AC voltage dip. Since the

AC side fault was not cleared in time, after 7th commutation failure, both Poles

have tripped on reduced short circuit level protection as explained above.

(iv) Actions Taken:

It was confirmed by CPCC that there was a CT failure in one of the KPTCL

stations at Somanahalli. Since the fault was external to HVDC and clearance was

given SRLDC, Pole 2 was deblocked at 15:02 hrs in GRM. After increasing the

power flow to 150 MW Pole 1 was deblocked at 15:08 hrs. Both poles were in

service in bipolar mode at 15:08 hrs and power flow was increased as per the

SRLDC requirement.

(v) Extension of Inter trip signal / SPS:

SPS signals were not generated. During commutation failures on both Poles,

power flow reduces to zero and increases to nominal value after recovery of the

AC system. However, in this case, there were repeated commutation failures in

both poles and by the time Poles were blocked the actual power loss was not

captured by the PLC logic and SPS was not generated. It is expected that the

modification proposed by POWERGRID & submitted for approval to SRPC may

help in resolving such issues. Relevant SER printouts were submitted to SRPC.

(viii) Analysis:

AT Somanahalli SS of KPTCL One no of 220 kV CT in R phase of HSR layout

feeder blasted at 14:31Hrs. During blasting of the CT, the jumper of R phase has

short circuited with Y phase. From the fault records it can be seen that the fault

was sensed at 14.31.58.916 ms. As the primary bus bar protection of KPTCL

provided on the 230 kV side bus bar has not operated, the fault continued up to

14:32:00.962 hrs and both transformers were subjected to a fault current of 4kA

separately. The Back up over current protection (IDMT) provided on the HV side

of ICTs operated and isolated the fault.

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• It was brought to the notice of the forum that the incident was discussed in

the special meeting of PCC held at Somanahalli on 14.05.2012 and

recommendations were made to avoid similar occurrences.

• The Spl PCC recommendations would be discussed in detail item No 35.

• SE, KPTCL informed that the R&M works of Somanahalli S/S was awarded to

M/s Easun Reyrolle.

• KPTCL informed that it is in the process of strengthening of Somanahalli

corridor so as to enable 220 KV lines to operate in grid mode for the purpose

of increased reliability.

• It was also informed that KPTCL would be implementing a SPS to ensure

continued power supply to water pumping stations at TK Halli and Harohalli.

5.2 Tripping of Pole I tripped and Pole-2 came on Ground Return

mode on 01.05.2012 at 17:48Hrs Due to HVDC line fault at

Location no 56, 18.47 km from Talcher end.

a. The incident report as submitted by SRTS II, PGCIL is given below.

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5.3 Tripping of Talcher-Kolar Pole-2 and Pole-1 came on Ground

Return mode on 19.05.2012 at 16:14Hrs Due to HVDC line fault

at Location no 57, 19.63 km from Talcher end.

a. The incident report as submitted by SRTS II, PGCIL is given below

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6. Minor Trippings

The Minor tripping in the Southern Region are given in Annexure II as

submitted by Lr No SRLDC/SRC&S/Prot/2012 /4559 dt. 13.06.2012.

7. Requirement of SPS for 400 KV Nellore-Almatti DC line

contingency.

SRLDC Vide Lr No Lr No SRLDC/SRC&S/Prot/2012 /4559 dt. 13.06.2012 (item

No 5) had proposed for a System Protection Scheme for 400 KV Nellore-Almatti

DC Line contingency.

With the commissioning of Simhapuri (300 MW) and Meenakshi (300 MW)

units 400 KV Nellore-Almatti DC line may get severely loaded. The

strengthening of this corridor would be achieved with the Commissioning of the

Nellore-Tiruvalum line which is expected by the year 2014. SRLDC was therefore

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proposing an SPS to back down generation at Simhapuri & Meenakshi to

alleviate the post contingency flows on N-1 condition of this line.


• The PCC forum agreed for the SPS in principle and the matter would be taken

to the higher forum for approval.

PCC RECOMMENDATIONS

v The forum recommended SRLDC to fine tune the SPS scheme to proceed

with the 400 KV Nellore –Almatti DC Line contingency SPS.

8. SPS for 220kV Chittoor- Tiruvalum and 220kV Sullurpet-

Gummidipoondi lines.

SRLDC Vide Lr No Lr No SRLDC/SRC&S/Prot/2012 /4559 dt. 13.06.2012

(item No 15) had proposed for a System Protection Scheme for 220kV Chittur-

Tiruvalum and 220 KV Sullurpet-Gummidipoondi lines.

Presently, 220 KV Chittoor-Tiruvalum line O/C setting at Chittur end is

420 A (160 MW) and 220 KV Sullurpet-Gummidipoondi line O/C setting at

Sullurpet end is 260 A (100 MW). The constraint is due to the loading concern on

the upstream lines. Considering this fact it was felt prudent to design an SPS to

trip 220 KV Chittoor- Tiruvalum and 220 KV Sullurpet-Gummidipoondi lines

based on the loading of the critical upstream lines instead of over current

protection and Line will be protected by distance protection.


• APTRANSCO informed the forum that the Over current settings of 220 KV

Chittoor –Tiruvalum Line at Chittoor end was set to 600 A.

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• For the 220 KV Sullurpet Gummidipoondi Line The PCC forum agreed for the

SPS in principle and the matter would be taken to the higher forum for

approval.

PCC RECOMMENDATIONS

v The forum recommended SRLDC to fine tune the SPS scheme for both the

lines.

9. 400 KV Hiriyur-Nelamangala D/C Contingency SPS

Proposal for a SPS in 400 KV Hiriyur –Nelamangala Line was

discussed in the PCC and OCC meetings. In view of proposed

commissioning of Bellary TPS Unit-II a SPS during tripping of one circuit of

400 kV Hiriyur-Nelamangala line when flow of each line was more than 560

MW was deliberated in the meetings.

It was informed that 400kV Hiriyur-Nelamangala SPS was

implemented partially (tripping of Jindal units were wired, BTPS final link for

tripping yet to be extended). It was noted in the 72nd meeting of OCC that the

SPS scheme was under active implementation by KPTCL. It was informed

that the remaining pending works would be completed in about one month’s

time.


• SE, KPTCL informed that the SPS is approved by KPTCL management. The

scheme is to trip 1 unit of 300 MW at JSW when the load on the remaining

Hiriyur-Nelamangala line crosses 800MW and remains in between 800-1000

MW when the other line trips. If the load crosses 1000 MW, 1 unit of 500 MW

at BTPS will be tripped.

• It was also informed that the PLC logic controller has been procured and

installed at Nelamangala and logic has been configured. The SPS logic is

enclosed for information (as Annexure III).

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• A trip signal would be generated at Nelamangala by PLC logic and the same

would be transferred either to JSW or to BTPS (KPCL) depending on the

condition.

• It was informed that M/s JSW has developed an internal logic to trip one unit if

a signal is received from Nelamangala and the generation at JSW is more

than 700 MW. The logic is also enclosed (Annex-IV).

• It was informed that M/s KPCL has given their consent to trip one unit of 500

MW. KPTCL has to procure PLC logic controller license and the work is under

progress.

PCC RECOMMENDATIONS

v The forum recommended KPTCL to implement the SPS at the earliest.

10. SPS at Hosur S/S

SRTS II,PGCIL vide Lr No SR II/O&M/2012-13/F-42.0 dt 07.06.2012 informed

that the controlled load shedding of 315 MVA ICTs at 400/220 KV Hosur S/s

to mitigate the overloading of one ICT in case of tripping of other has been

implemented w.e.f 07.06.2012.

PCC RECOMMENDATIONS

v The forum recommended SRTS II, PGCIL to inform the operation/non

operation and unintended operation if any of the SPS for information and

perusal of the PCC forum.

11. Status of provision of SPS Trip Signal 3 at Kolar

The proposal for Generation of third protection signal from Kolar in view of

higher power transfer (2000 to 2500 MW) was approved in 13th SRPC

meeting . In 14th PCC meeting SRTSII, PGCIL informed that inter trip signal-3

would be ready by May-2012.

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The Extended mode of operation of Talcher-Kolar HVDC link and its duration

would continue throughout the year as decided in SRPC meeting held on 1st

June 2012 depending upon the ambient temperature. The Trip Signal 3 to

cover loss of 2500 MW is required to be in place at the earliest and it would

also be ensured that the other 2 Trip signals are generated and acted upon.


• SRTS II, PGCIL informed the forum that the space to provide the equipments

would be taken up and the trip signal 3 would be ready by August 2012.

PCC RECOMMENDATIONS

v The PCC forum recommended PGCIL to implement the SPS Trip Signal 3

within the agreed time.

12. Modification of SPS Trip Signal at Kolar

SRTS II, PGCIL vide Email dt 07.06.2012 had informed that the

modifications as suggested in the special meeting of PCC have been

implemented on 30.05.2012. PGCIL also informed that the revised logics

were uploaded in the PLC and tested locally and found to be working. The

revised logic is as follows

Trip generation LOGIC

Condition 1:

((500MW<Power loss :S1000MW) & Pole Block) OR (l400MW< Power flow

:S1900MW) & Pole Block) OR (under one pole s/d (500MW<Power flow

<1000MW)) other Pole Blocks= TRIP I

Condition 2: (650MW<Power flow :S1150MW) & Line fault & Pole Block = TRIP I

Condition 3: ((Power loss >1000MW) & Pole Block OR (Power flow >1900MW) &

Pole Block) OR (under one pole s/d (Power flow> 1000MW)) other Pole

Blocks = TRIP II

Condition 4: (Power flow> 1150MW) & Line fault & Pole Block = TRIP II

*Power loss = DC power at Kolar at (t-2sec) - DC power at Kolar at

(t) where t is the time instant when Block signal is available.

Power flow = DC power at Kolar at (t-2sec).

This is for the information and perusal of the PCC forum.

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13. SPS for Kudankulam


• SRTS II, PGCIL informed the forum that the SPS would be ready by end of

July 2012.

PCC RECOMMENDATIONS

v The PCC forum recommended PGCIL to implement the SPS for Kudankulam

within the agreed time.

14. SPS at Varahi

The PCC forum envisaged a SPS at Varahi in the earlier PCC

meetings. Approximately 1050 MW ( more than 450 MW at Varahi and 600

MW of UPCL) had to be evacuated through 220 kV Varahi – Shimoga D/C

line and 220 kV Kemar – Shimoga S/C. It was informed that 220 kV Varahi –

Shimoga D/C line severely loaded with no N-1 reliability.


• SE, KPTCL informed that as 400 kV line between UPCL – Shantigrama

(Hassan) is expected to be commissioned within 20 days , SPS at Varahi may

be not required.

• Member Secretary (I/c) informed that as per the 14th PCC recommendations

the Scheme will be reviewed when Nandikur - Shantigrama 400 KV (Quad

moose Conductor) line commissioned by KPTCL.

• The PCC forum requested KPTCL to proceed with the Varahi SPS .

• KPTCL informed that, the scheme algorithm, hardware, PLC license are

ready. It can be implemented after getting KPCL’s clearance.

• KPTCL agreed to implement the scheme on or before 15th August 2012.

PCC RECOMMENDATIONS

v The PCC forum recommended KPTCL to implement the SPS within the

agreed time.

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15. SPS for S1-S2 bid area:

The PCC forum had suggested for an SPS to shed loads of 300 MW at Salem

to limit post contingency stress in S1-S2 corridor whenever one of 400 KV

Hosur-Salem and 400 KV Somanahalli-Salem line trips.


• CE, TANTRANSCO informed that the issue needed to be discussed in the

OCC meeting.

• MS (i/c),SRPC informed that the issue was discussed in the 70th- 72nd OCC

and the OCC forum also requested TANTRANSCO to implement the SPS at

the earliest.

• TANTRANSCO informed that the issue would be taken up with the

management and by the end of August 2012 the SPS would be implemented.

PCC RECOMMENDATIONS

v The PCC forum recommended TANTRANSCO to implement the SPS within

the agreed time

16. SPS at Muddanur:

The PCC forum proposed a SPS at Muddanur in the earlier PCC

meetings. The Muddanur generation (about 800 MW) has to be evacuated

through four 220 kV lines, 220 kV D/C Chinnakampally and 220 kV D/C

Ananthapur and radial loadings of 200 kV Pulivendala (120 MW) and 220 kV

Yerraguntla (80 MW). In case of tripping of one of the lines of 220 kV

Chinnakampally other line get over loaded and may lead to cascade tripping.

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• APTRANSCO informed the forum that the SPS at Muddanur had been

implemented and a letter in this regard would be sent to the SRPC

secretariat at the earliest.

PCC RECOMMENDATIONS

v The PCC forum congratulated APTRANSCO for commissioning the SPS at

Muddanur and requested APTRANSCO to send the details of the SPS and

the date and time of implementation of the SPS for the records and perusal of

the PCC forum.

17. SPS on 400 kV Vijayawada-Nellore line

The PCC forum proposed a SPS to back down generation at Vemagiri

complex in case of tripping of one of the 400 kV Vijayawada-Nellore line when

each line carrying 550 MW . The issue was discussed in various SRPC forum

meetings and SRLDC had also provided additional study results.


• It was informed that the issue had been discussed in the 19th SRPC meeting

held on 1st June 2012. • The issue would be further discussed in detail in the Special meeting of PCC

convened on the Afternoon session of the PCC meeting.

SPL PCC RECOMMENDATIONS

v The record of discussion in the Special meeting of PCC is enclosed as

Annexure V

23

18. Operation and review of various SPS Scheme in the Southern

Region

In the 14th PCC meeting the forum decided that the operation of Various SPS

schemes in the Southern Region would be brought to the notice of the forum

during the fourth coming PCC meeting. The forum proposed that the operation,

non operation and mal operation of the SPS schemes would be discussed in the

forth coming PCC meeting.

S.NO SPS Description Operation Non

Operation

Mal

Operation

Remarks

1 SPS at Nagjhari Nil Nil Nil

2 SPS at Peenya Nil Nil Nil

3 SPS at HVDC

Kolar

Discussed

in detail in

item No 5

4 SPS at Hosur -* -* -*

5 SPS at

Mamidipally

-* -* -*

* data not received

All the constituents are requested to send the particulars of operation, non

operation and mal operation of SPS in the their system as per the IEGC

reporting procedure.(i.e within 24 Hours ).


• It was brought to the notice of the forum that in the sub group meeting of PCC

held on 30th April at Kaiga it was proposed to review the existing SPS at

Nagjheri to take care of line loadings on Bidnal-Harthi and Hubli-Sirsi lines

(action KPTCL).

• SE, KPTCL informed that the SPS would be modified latest by 15th August

2012.

24

19. Uniformity in Protection Philosophy and Protection relay

coordination in SR

(i) TANTANSCO vide Lr No CE/P&C/SE/D/EPC2/AEE3/f SRPC/Dt

08.06.12 given the following agenda.

(ii) KSEB vide Lr No.CESO/EELD1/AE2GS/ PC/ 2012-13 dt nil sent the

following agenda In the 12th meeting of the Special Protection

committee, it was decided to adopt a zone II timing of 350 msec for

having a uniform protection philosophy in the Southern region. Based

on that, the Zone II timing for majority of 220kV feeders in our region

have been changed to 350msec. But it was noticed that the setting of

the feeders at Power grid end was non-uniform and because of this

grading is not achieved. The current settings of the PGCIL feeders are

listed below.

Name of feeder current Zone#2 setting at PGCIL end

1. 220kV PGCIL #1 at PothencodeS/s 450msec 2. 220kV PGCIL #2 at PothencodeS/s 450msec 3. Edamon- Thirunelveli#1 at EdamonS/s 300msec 4. Edamon- Thirunelveli#2 at Edamon S/s 300msec 5. Kundara- Kayamkulam at Kayamkulam GIS S/s 500msec 6. Edappon- Kayamkulam at Kayamkulam GIS 500msec

25


• In the meeting CE,TANTRANSCO briefed the forum regarding the protection

settings adopted in the 400 KV Substations of the TANTRANSCO

substations .He also insisted for uniformity in the protection settings adopted

by all the constituents of the Southern Region.

• SRTSII,PGCIL informed the forum that they would discuss the issues with

KSEB & resolve it amicably.

PCC RECOMMENDATIONS

v It was brought to the notice of the forum that the issue of uniformity and

protection relay coordination issue of the SR constituents were discussed in

detail in the Spl meeting of PCC held on 23.06.011 .

v SE, SRPC requested the constituents to adhere to the recommendations of

the Spl PCC in respect of Protection relay coordination and uniformity in

protection settings.

20. Provision of Single Phase Auto-Reclosing, Carrier Aided tripping

and Bus Bar Protection Scheme on 220 KV and above lines in

SR.

In the earlier PCC meetings, it was agreed to have single phase auto-

Reclosing scheme on all lines emanating from all major generating stations

including nuclear stations and on all 220 kV and above rated lines. The PCC

forum recommended that all the constituents to have carrier aided tripping for

all the 220 KV and above rated lines. The forum also recommended that all

the constituents to have an independent Bus Bar protection scheme to protect

their transmission system elements.

26

• As on date the status of data submitted by the constituents is as follows.

S.No Constituent Carrier Aided Tripping Status

Single Phase Auto reclosing status

Bus Bar Protection status

1 APTRANSCO Data Submitted

Data Submitted

Data Not* Submitted

2 KSEB Data Submitted

Data submitted

Data Submitted

3 KPTCL Data Submitted

Data submitted

Data Not * Submitted

4 TANTRANSCO Data Submitted

Data submitted

Data submitted

5 SRTS I,PGCIL Data Not submitted

Data Not submitted

Data Not * submitted

6 SRTS II,PGCIL Data Submitted

Data submitted

Data Submitted

6 NTPC Data submitted

Data submitted


7 NLC Data Submitted

Data Submitted

Data Submitted

8 MAPS,NPCIL Data Not ^ submitted

Data Not ^ submitted


9 KAIGA,NPCIL Data Not ^ submitted

Data Not ^ submitted


10 Puducherry Data Submitted

Data submitted

Data submitted

* Requested to send the updated List of Substations provided with Bus

Bar Protection in as per the Annexure VI.

^ Requested to send the updated List of Lines provided with Carrier

Aided Tripping /Single Phase Auto Reclosing scheme as per the

Annexure VII .


• CE, KPTCL informed the following in the meeting.

27

• Status of Carrier aided Protection of 220 kV lines of KPTCL:

Total Carrier

protection

provided

Carrier protection

to be provided

Lines connected between

KPTCL stations and Generating

stations

40 33 7

Lines connected between

KPTCL stations and PGCIL

stations

42 40 2

Interstate lines 8 1 7

Lines between Generating

stations

5 5 --

Lines between KPTCL stations 140 28 112

Total 235 107 128

• It was informed that order was placed for protection couplers and the material

will be expected by the end of Dec-2012. The proposed to be completed

within 3 months.

• Status of Bus bar protection for KPTCL Substations:

Total number of

stations

Number of station

to which bus bar

protection

provided

Number of station to

which bus bar protection

to be provided

89 64 25

• Out of 25 stations, about 5-6 stations are included in R & M works,

Action would be initiated for other stations.

28

PCC RECOMMENDATIONS

v The PCC forum requested that all the constituents to send the updated

status of implementation of provision of Carrier Aided Protection facility,

Single Phase Auto reclose facility and provision of Bus Bar Protection facility

in the 220 KV and above network in Electronic format (as per Annexure VI

&VII) latest by 17.08.2012 to the following Email IDs.

• 1. [email protected]



21. Agenda from SRTS II,PGCIL

(i) Commissioning of carrier aided protection scheme for all 220 kV lines

(ii) Overloading of ICTs at Thirunelveli & Madurai- Requirement of SPS

scheme: The Thirunelveli & Madurai ICTs are operating at near to full load

and operating at overloads intermittently. The requirement of SPS may please

be discussed in the meeting.

(iii) Submission of tripping reports to SRLDC/SRPC by all utilities.


• The forum requested all the constituents to provide carrier aided protection

scheme to all 220 KV and above lines.

• The Protection Subcommittee agreed in principle for the SPS Scheme

• The forum also requested all the constituents to send the tripping reports with

the details as mentioned as per IEGC 5.9.6 (c) to SRPC Secretariat through

Email to the following email IDs.

1. [email protected]



29

22. Islanding scheme for Jindal, BTPS.

An islanding scheme covering Munirabad, Kustagi Sindhanur Loads and

JSW Generators was proposed in the earlier PCC meetings. It was brought to

notice of the forum that M/s. Jindal has an islanding scheme in operation

where 1 x 100 MW and 1 x 133 MW units island with 180 MW load of its steel

plant. As JSW has a load of 500 MW, M/s. Jindal was asked to explore

possibility of a second island. M/s. KPTCL / KPCL was also requested to

formulate an island for BTPS with radial loads at Munirabad, Kustagi and

Sindhanur.

• The following Loads were identified by KPTCL for the proposed islanding

scheme. Kustagi :107 MW, Sindhanur:55 MW, Munirabad:49 MW,Alipur:80

MW,Total:291 MW.


• SE,KPTCL informed that the island would be formulated action had been

initiated in this regard.

23. Islanding Scheme for Kaiga

The provision of Islanding scheme for Kaiga Generators was discussed in the

earlier PCC meetings. Kaiga, NPCIL was requested to formulate the Kaiga

islanding scheme with adjoining loads in consultation with SRLDC, KPTCL

&PGCIL.

• Islanding scheme for Kaiga had been discussed in detail in the 1st meeting of

Monitoring Committee held on 06.06.2012 and it was proposed to have two

islands called “Island12” and “Island34”. Details of scheme are discussed in

item No 35.

30


• Kaiga, NPCIL informed that the islanding scheme work would be examined

for implementation after resolution of certain issue.

PCC RECOMMENDATIONS

• The forum requested Kaiga, NPCIL in coordination with KPCL and KPTCL to

formulate the islanding scheme at the earliest.

24. Islanding Scheme for Simadhri and VTS

In the 15th PCC meeting DE, APTRANSCO had proposed for an islanding

scheme for Simadhri and VTS Generating unit with adjoining loads of

APTRANSCO.


• The forum requested APTRANSCO to formulate the Islanding scheme in

consultation with NTPC and APGENCO.

• NTPC informed the forum that the scheme would be taken up with the

management after formulation of the islanding scheme.

25. Non Submission of complete tripping Report by the constituents.

SRLDC vide Lr No SRLDC/SRC&S/Prot/2012 /4559 dt. 13.06.2012 (item no

13) had informed that though the constituents have started giving tripping

reports for the trippings in their system most of the constituents are not

submitting the DR/EL printouts.

31


• The issue was discussed in item No’s 4.4, 4.5 and 21 and the constituents

were requested to send the complete tripping/disturbance/incidence report to

the SRPC secretariat at the earliest.

26. Review of Installation of Frequency Trend Relays (df/dt) and

revision of df/dt settings in SR

• In the 14th PCC the forum proposed a new df/dt settings for the SR system.

• Present df/dt Settings in SR:

ALARM: Frequency <= 49.5 Hz and 0.3 Hz/sec fall of frequency (df/dt)

Trip: Frequency <=49.3 Hz and 0.3 Hz/sec fall of frequency (df/dt)

Then

Load relief expected: 3530 MW in Peak condition

2909 MW in off Peak condition

• Proposed df/dt Settings in SR in addition to the existing setting:

ALARM: Frequency <= 49.8 Hz and 0.2 Hz/sec fall of frequency (df/dt)

Trip: Frequency <=49.5 Hz and 0.2 Hz/sec fall of frequency (df/dt)

Then

Load relief expected: 2000 MW in Peak condition.

Status of df/dt Relays installed in Southern Region:

S.NO Constituent System

df/dt relay Setting Expected load relief (MW)

1 APTRANSCO 49.3 Hz, 0.3 Hz / Sec, Instantaneous

1767

2 KPTCL -do- (485 – 1036) 3 TANTRANSCO -do- 559 4 KSEB -do- (121 – 175) Total load relief in SR (2909 – 3530)

• The issue was also discussed in the 70th – 72nd OCC and the constituents

were briefed about the revision in the df/dt settings.

32


• The constituents were requested to provide the additional relief at the

earliest and the progress made in this regard may be intimated to the

forum.

27. The issue of sending completed Dynamic Study data

In the earlier meetings of PCC the forum decided to collect the Dynamic study

data from the utilities to study the Southern Region system. The dynamic

study format was circulated to the constituents to send the Generator,

Excitation system, Governor, HVDC parameters .TNEB, NLC , NTPC,

Kayankulam and KSEB had submitted the filled format.

The following constituents they have not sent the Dynamic study data as

circulated in the minutes of the meeting.

NTPC (Ramagundam), KPCL, APGENCO, MAPS & KGS (NPCIL).

• The forum opined that the dynamic study details of the IPPs also would be

necessary to conduct the study on whole SR system.

• The forum insisted that the constituents who had not sent the data to send at

the earliest.

PCC RECOMMENDATIONS

• NTPC (Ramagundam), KPCL, ,MAPS&KGS (NPCIL) were requested to

send the dynamic study data (Annexure VIII) latest by 17.08.2012.

• All the SLDCs were requested to direct the embedded IPPs connected at 220

KV and above voltage level to send the completed dynamic study format

(Annexure VIII) to the SRPC, Secretariat.

• It is requested that the dynamic study data in the stipulated format may be

sent to us latest by 17.08.2012 by Email to the following Email IDs.


[email protected]


33

28. Pilot PMU Project in the Southern Region.

The pilot PMU project was approved in the 14th SRPC meeting held at Kochi

on 27th August 2010. SRLDC proposed for 6 numbers of Phasor

Measurement Units for the Southern Region at an estimated expenditure of

Rs.4.0 Crores.


• CM, SRLDC informed that PMU at Somanahalli had been commissioned on

17/07/2012 and the PMU started generating the data.

• It was noted that the other PMUs would be installed within 2 months time.

29. Expected UFRs load relief quantum:

The Quantum of additional load relief to be provided by the constituents for the

year 2012-13 as calculated by SRPC is given below.

(Figures in MW) Constituents ? AP KAR KER TN PUDU SR

Stage - I @ 48.8 Hz

25% 2478 866 534 240 842 18 2500

Stage - II @ 48.5 Hz

35% 3469 1206 703 127 1071 29 3136

Stage - III @48.2 Hz

40% 3964 1373 901 457 1207 34 3972

Total (implemented) ?

3445 2138 824 3120 81 9608

Additional Requirement ? 85 213 30 -31 6 303

34


• In the meeting the constituents were requested to send the UFR trippings to

SRPC at the earliest.

• The forum also requested to provide the designated relief at the earliest.

• The status of provision of designated relief may be intimated to the PCC

forum.

30. Emergency Load Disconnection Scheme during sustained

over drawl at Low Frequency.

In the 14th meeting of SRPC held on 27th August 2010 had agreed to

implement Automatic Load Disconnection Scheme for overdrawing

constituents with the following relief:

S.No. Constituents Load Relief 1 APTRANSCO 450 MW 2 KPTCL 350 MW 3 KSEB 125 MW 4 TANTRANSCO 650 MW 5 PUDUCHERRY 25 MW

• KPTCL had earlier informed that 350 MW of load relief through remote

tripping of load under crisis period has been identified. The same is under

testing and final implementation stage and would be implemented shortly.

• It was noted that Puducherry had provided remote tripping facilities in the

identified feeders in order to provide emergency disconnection.

This for the information of the PCC forum.

35

31. Providing synchronizing facility at Key Stations for black

start restoration:

The current status of synchronizing equipment installation at key stations is as

follows:

S.No Sync. facility requirement at station

Status

1 Hubli To be provided during R & M works. However Bidnal station is having synchronous facility. Nagjhari can be synchronized at Bidnal and then supply can be extended to Hubli as a temporary arrangement.

2 Mahalingapura Provided.

3 Kayathar 110 kV To be provided by the end of August 2012.

4 Kadra, Kodasahalli Yet to be provided


• The forum requested that all the Generators needed to have synchronization

facility.

• The forum also requested that the identified station would be provided with

Synchronizing facility at the earliest.

• The status of provision of Synchronizing facility may be updated.

32. Protection aspects of Wind Turbines:

The PCC forum had emphasized the need to examine and optimize the

protection practices adopted for Wind Turbines as penetration levels are

increasing.

SRLDC vide Lr No SRLDC/SRC&S/Prot/2012 /4559 dt. 13.06.2012 (item no

14) give the following agenda.

On 03.06.2012 at 10:48Hrs one of the 110 KV wind pooling Station, 110

KV O-Tulukapatti station went dead due to CT Blast in 110 kV Kayathar – O-

36

Tulukapatti Feeder Causing outage of about 500 MW Wind Generation. SR

Frequency Dipped from about 49.60Hz to 49.00Hz.There is a need to

examine and optimize the protection practices adopted for Wind Turbines as

well as protection at Wind Pooling stations as the penetration levels are

increasing.


• The forum felt that the issue of wind turbine protection would be discussed in

detail in the forth coming meeting of PCC,

33. Voltage Control Relays as per IEGC .

As per 5.2.(t) of System Security Aspect of Operating Code (Part -5) of

IEGC, voltage control relays should be provided. The IEGC “ The Users, CTU

and STUs shall provide adequate voltage control measures through voltage

relays as finalized by RPC to prevent voltage collapse ,and shall ensure its

effective application to prevent voltage collapse/cascade tripping. The PCC

forum recommended for feasibility study for provision of Voltage control relays

in the following nodes i.e. at Somanahalli, Sriperumbudur, Kalavindapattu,

Almatti, Mysore etc.


• CE, TANTRANSCO informed the forum that the issue needed to be

discussed in the OCC forum.

• MS(I/c),SRPC informed that this issue had been discussed in detail in the

OCC forum and the PCC members also would substantiate their views to the

management for the installation of Voltage Control Relays as per IEGC.

PCC RECOMMENDATIONS

• The forum agreed in principle for the provision of under voltage relays as

mandated in IEGC Regulations to control low voltages.

37

• The LV situation at the following nodes: Sriperumbudur, Almathy, Chittoor,

Nellore, Mysore, Somanahalli, Kalavindapattu, Trichur & Hosur were noted.

• The status of provision of Voltage Control Relays may be updated in the next

PCC.

34. Review of Talcher SPS

In the meeting the review of SPS at Talcher was brought to the notice of the

forum. DGM, NTPC informed that the SPS would be modified to back down all

the generating units instead of tripping the units.


The forum requested NTPC to submit the details of the SPS modifications i.e

over view of the scheme, SLD and the logic of the SPS.

35. Review of Deliberations of 1st Monitoring Committee meeting and

other meetings of protection subcommittee.

The forum discussed the issues and recommendations made in the various

meetings of protection subcommittee held between the 14th PCC and 15th PCC.

The following meetings were held during the period from April 2012 to June 2012

and the minutes/recommendations were given as annexure.

I. Spl meeting of PCC held on 19.04.2012- Annexure IX

II. Spl meeting of PCC held on 30.04.2012- Annexure X,XI

III. Spl meeting of PCC held on 14.05.2012- Annexure XII

IV. 1st Monitoring Committee of PCC held on 06.06.2012- Annexure XIII

38

I.SPL PCC( held on 19.04.2012) RECOMMENDATIONS & DELIBERATIONS

IN THE PCC MEETING

• KPTCL was advised to explore the possibility of carrying out renovation

at 400 KV Guttur Substation especially considering the fact that the

breakers have become old.

• KPTCL was recommended to examine the possibility of taking 50% of the

load on each bus 400 kV Guttur S/S.

• It was proposed to review the existing SPS at Nagjheri to take care of line

loadings on Bidnal-Harthi and Hubli-Sirsi lines (action KPTCL).

• SRLDC may study the possibility of having split bus operation at

Narendra S/S. This is in view of the fact that ICT drawl at 400 kV

Narendra is low and more power is flowing in the 220 kV systems.

• In the 1st Monitoring Committee meeting of PCC,SRLDC informed that

preliminary studies regarding split bus at Narendra had been conducted

but had not yielded satisfactory results. KPTCL informed that Narendra

split bus operation was not required till December 2012. After December,

split bus operation can be studied depending up on the system

requirements.

• The simultaneous LCs of elements in the Kali Complex area should be

optimized to take into account the system security.

• SLDC/KPTCL agreed to optimize the issue of simultaneous LCs of

elements in the Kali Complex area.

• KPCL to undertake testing/replacement wherever applicable for the relays at

RTPS & BPTS (MiCOM P437).

• It was observed that in respect of BPTS-Jindal line, no direct tripping was

received at Jindal end though the line tripped at BPTS end on over voltage.

• KPCL to disable over current feature on the 400 kV BPTS-RTPS line.

39

II. SPL PCC( held on 30.04.2012) RECOMMENDATIONS & DELIBERATIONS

IN THE PCC MEETING

KAIGA,NPCIL ISSUES

§ It was brought to the attention of KAIGA that the high voltage conditions

prevalent in that area. It was pointed out to them that one of the reasons

for high voltage was for the relatively less generation in Kaiga GS leading

to lesser line loadings. The issue relating to high voltage will be put up by

SRLDC in the next meeting of Standing Committee on Power System

Planning. Kaiga GS was advised to ascertain the availability of space for

installation of additional bus reactor. Further, Kaiga units were requested

to absorb more MVAR as per the capability curves.

§ SRLDC would obtain the details of loads etc from KPTCL for the proposed

islanding scheme. The islanding scheme would be discussed in more

detail during the first meeting of the Monitoring Committee proposed to be

held in SRLDC during May 2012.

§ There will be a single nodal officer to represent Kaiga I & II as well as Kaiga

III & IV so as to improve the communication especially during crisis period (

i.e. Coordination between Stage-I & Stage-II of Kaiga). Nominating Single

Nodal Officer at Kaiga.

§ Reversion to original set points for protection at Kaiga

§ As regards Single Phase Reclosure facility, NPCIL expressed certain

constraints in the issue. However, Kaiga GS was requested to take up the

matter in a time bound manner with the equipment manufacturer so as to

ascertain the feasibility of providing this facility which would help improve

the transmission availability during transient faults.

§ Kaiga GS was requested to avail supply either through 220 kV or 400 kV

for synchronization after the units have gone into house load operation.

§ During the next outage of any of the Kaiga units, the possibility of charging

the bus at Kaiga from Kadra will be explored.

§ Kaiga GS will restore the settings of the relays at 200 kV lines since the

relays were presently seeing faults up to Hubli.

40

§ Coordination of Kaiga Islanding Scheme (Action

SRLDC/KPTCL/Kaiga/SRPC)

§ Black Start Restoration Procedure mock drill and Kodasalli to extend supply

to dead bus at Kaiga along with KAPS Auxiliaries.

• In the 15th PCC meeting representative from Kaiga informed that status

of the above issues would be intimate to the SRPC secretariat with in a

weeks’ time.

KPTCL ISSUES

§ Provision of bus bar protection at Ambewadi

§ Shifting of Kaiga lines to another bus bar i.e. availability of two bus bar

systems at Guttur end. Positioning of ICT on each bus. While planning for the

New Guttur station, as agreed in the 34th standing committee of SR, One and

half breaker scheme may be provided for the New Guttur Station.

§ Coordination of Kaiga Islanding Scheme

§ Strengthening of 220 kV lines from Kaiga to Kadra & Kodasalli and NJPH

evacuation-Possibility of re-conductoring with high ampacity conductors.

§ Re establishing the hot line (VSAT) facility between Kaiga APS 220 KV and

Karnataka SLDC.

KPCL ISSUES

• Provision of synchronizing facility at Kadra GS (Action KPCL)

• Black Start Restoration Procedure mock drill and Kodasalli to extend supply

to dead bus at Kaiga along with KAPS Auxiliaries.

41

III. SPL PCC ( held on 14.05.2012) RECOMMENDATIONS & DELIBERATIONS

IN THE PCC MEETING

42

IV. RECOMMENDATIONS OF 1st MEETING OF MONITORING COMMITTEE

(held on 06.06.2012) & DELIBERATIONS IN THE PCC MEETING

i. Provision of bus bar protection at Ambewadi S/S:

KPTCL informed that R&M works contract for 220kV Ambewadi S/S

had been awarded to M/s Easun Reyrolle. Bus bar protection installation is

part of R&M and would be completed by December-2012.

ii. Reversion to original set points for protection at Kaiga:

NPCIL confirmed that Zone-1 protection of 220 kV Kaiga- Kadra and

220 kV Kaiga- Kodasalli lines at Kaiga end made 100% and Timing of Zone-

2 & 3 was revised to 300 ms & 600 ms respectively. The Zone -1 would be

made 80% and Zone -2 &3 would also be revised after assessing

performance during monsoon.

iii. Shifting of 400kV lines at 400kV Guttur on to different buses with Bus

coupler closing was carried out on 29.04.2012. The arrangement of lines

is as follows:

43

a. On Bus-1: Hiriyur-2, Narendra-1, Munirabad, Kaiga-1 and ICT-2.

b. On Bus-2: Hiriyur-1, Narendra-2, JSW, Kaiga -2 and ICT-1.

iv. Provision of synchronizing facility at Kadra SS:

KPCL informed that ABB Executive had visited the site, however the

report was awaited. The status would be furnished in the next Protection

Committee meeting.

v. NPCIL agreed to send communication conveying nomination of single Nodal

Officer for coordination between Kaiga Stage -1 and Stage-2.

vi. KPTCL informed that a few 400 KV Guttur breakers were being overhauled

and replacement of 3 breakers is under progress. It would be completed by

end of December-2012.

vii. KPTCL informed that for Nagjheri SPS extension, procurement of 2 nos. PLC

license (ABB) is under progress, and would be completed by end of June

2012.

viii. KPTCL confirmed that all 220 KV lines in Kali complex area are presently in

closed condition and care would be taken to avoid simultaneous LCs in

future.

ix. Kaiga Islanding scheme:

The proposed Kaiga islanding scheme was discussed in detail. It is proposed

to have a 220 KV and 400 KV Island at Kaiga by tripping the ICTs at Kaiga.

The islanding schemes are as follows:

Island 12 (220kV Kaiga U1& 2 Island):

The island includes the following loads and Generation:

Load:

Sr.No. Substation Name Load MW

1 220kV Kaiga -

2 220kV Kadra -

3 220kV Kodasalli -

4 220kV Nagjheri -

44

5 220kV Bidnal 50

6 220kV Hubli 50

7 220kV Soundatti 50

8 220kV Mahalingapur 100

9 220kV Ambewadi 10

10 220kV Narendra-KPTCL 50

11 220kV Belgaum 100

12 220kV Chikkodi 100

13 220kv Karwar 50

14 220kV Ponda Draft-Minutes

of 1st meeting

of monitoring

committee

held on

06.doc90

15 220kV Kanabargi (220/110kV T/F

to be tripped)

-

16 220kV Indal 20

Total 670

Generation:

Sr.No. Generating station Generation in MW

1 Nagjheri 600

2 Kadra & Kodasalli 150

3 Kaiga Unit-1&2 300

Total 1050

Accordingly LDC, KPTCL would advise Nagjheri Power house to set

the toggle to trip the appropriate no. of units at Nagjheri depending on the

island’s load generation balance. In case of non-availability of one of the

220kV lines from 220 kV Kaiga, one of the units would need to go on house

load. LD, KPTCL would arrange for the same to be displayed in their SCADA

for better visibility.

Island 34 (400kV Kaiga U 3& 4 Island):

The island includes following loads and Generation:

45

Load:

S.No. Substation Name Load MW

1 400 kV Kaiga -

2 400 kV Narendra -

3 220 KV Narendra-PG -

4 400kV Guttur -

5 220kV Davangere 150

6 220kV Ranibennur 50

7 220 kV MK Hubli 50

8 220 kV Ghataprabha 30

9 220 kV Haveri 60

Total 340

Generation:

S.No. Generating station Generation in MW


Total 300

During discussions, it was understood that auxiliaries of both the stages are

being fed from 220kV system. It was suggested to NPCIL to feed the

auxiliaries of 220 kV connected Units from 220 kV system and 400kV

connected units from 400 kV system. With this arrangement, the islanding

would be smoother and have better chances for survival.

x. SRLDC informed that preliminary studies regarding split bus at Narendra had

been conducted but had not yielded satisfactory results. KPTCL informed that

Narendra split bus operation was not required till December 2012. After

December, split bus operation can be studied depending up on the system

requirements.

xi. KPTCL informed that they had appraised their Management regarding the

strengthening of 220kV lines from Kaiga to Kadra, Kodasalli and also Nagjheri

evacuation by providing HTLS conductor.

46

xii. KPTCL informed that HCL executive had visited the site and Hot line (VSAT)

facility between Kaiga 220 kV SS and SLDC, KPTCL would be reestablished

by end of June-2012.

xiii. It was agreed to conduct black start restoration Procedure Mock drill at Kadra

and Kodasalli and extend supply to dead bus at Kaiga along with KAPS

auxiliaries in July 2012 during the shutdown of Unit -2. NPCIL would revert

back regarding the quantum of auxiliaries’ load that can be put during the

Mock exercise.

xiv. NPCIL informed that single phase auto reclosing scheme may be

implemented after examining the experience at Narora.

xv. Regarding Third party protection audit at Guttur, KPTCL informed that they

may try to add the same in the scope for Guttur R&M works. However they

also said that Third party protection audit may be required in substations of

other utilities as well.

xvi. KPTCL informed that they would discuss the issue regarding non-availability

of data during grid disturbances with their SCADA department and revert

back.

xvii. KPCL and NPCIL confirmed that the carrier protection on 220 KV Kaiga-

Kadra and 220 KV Kaiga- Kodasalli lines would be implemented by end of

June 2012.

xviii. KPTCL and NPCIL confirmed that the problem in PLCC between Kaiga and

Guttur had been attended and it was presently working.

PCC RECOMMENDATIONS

v The forum recommended KAIGA, NPCIL to inform the progress/status of

the above protection issues latest by 17.08.2012.

v The forum requested KPTCL and KPCL to send the status of the

pending protection issues latest by 17.08.2012.

v In the meeting it was decided to hold a special meeting of PCC at KPCL

on 02.08.2012 to discuss the KPCL issues.

v The minutes of the special meeting of PCC held at KPCL, Bangalore is

enclosed as Annexure XIV.

47

36. Date & venue of the next meeting.

The next PCC meeting will be held in the month of October 2012.The exact

date and venue shall be communicated in due course.

ANNEXURE - I

S.No Name (S/Shri/Smt) Designation Organisation Email ID Phone no1 V.S.Subba Rao SE (P) APTRANSCO [email protected] 94408111032 M.Balasubramanyam DE(System Protection) APTRANSCO [email protected] 94408176023 P.Rathnakar SE APGENCO [email protected] M.E.Varghese Ex.Engr KSEB [email protected] 94470492245 A.S.Georgekutty Ex.Engr KSEB [email protected] 94460082566 S.V.Govindaraju CEE (RT & RSD) KPTCL [email protected], 94483651637 Gajanan Sharma SE(E) (RT) KPTCL sharmag54&gmail.com 94495968418 K.R.Ratan Kumar SEE RT KPTCL 94483500009 Shripad Hegde AEE(E) KPTCL [email protected] 944836511010 Shashidhar J.N. Bhat EE (E) KPCL 973881230611 Manjula V. AE (E) KPCL [email protected] 890449887012 V.G.Manoharan CE (P&C) TANTRANSCO [email protected] 944539707013 R.Shanmugam EE, (D/P&C) TANTRANSCO [email protected] 944539670714 R.V.Manohar Sr.Maint. Engr,KGS NPCIL [email protected] 944829175415 S.S.S.Srinivas DGM (EM) NTPC [email protected] 944091819516 C.Malakondiah DGM,Talcher NTPC [email protected] 943701483617 M.Rangarajan Sr. Manager (OS) NTPC [email protected] 944091803418 YVLSSV Prasad DGM NTPC, Simhadri [email protected] 944091846919 N.Sabapathi CM(E) NLC [email protected] 944304984020 P.Ranga Rao DGM (OS) PGCIL [email protected] 949061109621 B.Sridhar Mgr,SRTS II PGCIL [email protected] 944959603522 L.K.Khaj Kumar CM PGCIL [email protected] 944959903123 P.Bhaskar Rao AGM SRLDC/POSOCO [email protected] 944959915324 C.N.Sureshbabu DGM SRLDC/POSOCO [email protected] 944959915625 S.P.Kumar CM SRLDC/POSOCO [email protected] 944959916326 N.Nallarasan CM (GM) SRLDC/POSOCO [email protected] 944959919027 G.Madhukar Sr. Engr SRLDC/POSOCO madhu@srldc,org 944959919427 S.R.Bhat Member Secretary (I/c) SRPC [email protected] 962018464928 A.Balan Supt. Engr. SRPC 948354052829 Satbir Singh Supt. Engr. SRPC [email protected] 963204500931 R.M.Rangarajan Ex.Engr SRPC [email protected] 944907883332 S.K.Rajendra.R Asst.Ex.Engr SRPC [email protected] 944856867033 J.B.Len Asst.Ex.Engr SRPC [email protected] 9449682204

LIST OF PARTICIPANTS OF 15th PCC MEETING OF SRPC HELD AT BANGALORE ON 18.07.2012

ANNEXURE IIPage 1 of 7

Sl No Date Time Element Type Element Remarks Date Time1 2-Feb-12 11:56 220 KV LINE 220 kV SEDAM - TANDUR TRIPPED AT SDM END. 2-Feb-12 12:39

2 2-Feb-12 11:56 220 KV LINE 220 kV SEDAM - TANDUR TRIPPED AT SDM END. 2-Feb-12 12:39

3 2-Feb-12 12:44 400 KV LINE 400 kV KAIGA - NARENDRA 2 R-N FAULT. 2-Feb-12 13:05

4 3-Feb-12 9:53 220 KV LINE 220 kV SEDAM - TANDUR TRIPPED DUE TO BUS FAULT 3-Feb-12 12:41

5 3-Feb-12 9:53 220 KV LINE 220 kV SEDAM - TANDUR TRIPPED DUE TO BUS FAULT 3-Feb-12 12:41

6 5-Feb-12 18:02 400 KV LINE 400 kV VIJAYAWADA - VEMAGIRI 1 TRIPPED ON OVER VOLTAGE 14-Feb-12 9:46

7 5-Feb-12 18:02 400 KV LINE 400 kV VIJAYAWADA - VEMAGIRI 1 TRIPPED ON OVER VOLTAGE 14-Feb-12 9:46

8 6-Feb-12 6:58 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON O/L 6-Feb-12 9:25


10 9-Feb-12 7:35 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVERLOAD. 9-Feb-12 9:18

11 9-Feb-12 13:57 220 KV LINE 220 kV AMBEWADI - PONDA 2 DISTANCE PROTECTION RELAY OPERATED 10-Feb-12 17:42


13 11-Feb-12 12:05 220 KV LINE 220 kV IDUKKI - UDUMALPET EARTH FAULT 11-Feb-12 12:44

14 11-Feb-12 12:05 220 KV LINE 220 kV IDUKKI - UDUMALPET EARTH FAULT 11-Feb-12 12:44

15 12-Feb-12 18:00 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 1 TRIPPED ON OVER VOLTAGE 13-Feb-12 6:45


17 12-Feb-12 10:04 220 KV LINE 220 kV AMBEWADI - PONDA 1 R-PH JUMPER REPLACEMENT WORKS AT AMB S/S 12-Feb-12 14:35

18 12-Feb-12 10:03 220 KV LINE 220 kV AMBEWADI - PONDA 2 R-PH JUMPER REPLACEMENT WORKS AT AMB S/S 12-Feb-12 14:34

19 12-Feb-12 13:10 220 KV LINE 220 kV IDUKKI - UDUMALPET B-N FAULT 12-Feb-12 13:38


21 12-Feb-12 1:00 400 KV LINE 400 kV TIRUNELVELI - KUDAMKULAM 3 TRIPPED ON O/V 12-Feb-12 18:58

22 12-Feb-12 18:00 400 KV LINE 400 kV TIRUNELVELI - KUDAMKULAM 1 TRIPPED ON OVER VOLTAGE 22-Feb-12 15:05

23 12-Feb-12 18:00 400 KV LINE 400 kV UDUMALPET - TIRUNELVELI 2 TRIPPED ON OVER VOLTAGE 13-Feb-12 7:44

24 13-Feb-12 4:38 220 KV LINE 220 kV GOOTY - ALIPUR LINE PROTECTION OPTD. 13-Feb-12 5:39

25 13-Feb-12 4:38 220 KV LINE 220 kV GOOTY - ALIPUR LINE PROTECTION OPTD. 13-Feb-12 5:39

26 13-Feb-12 12:22 HVDC HVDC GAJUWAKA POLE 1 BLOCKED DUE TO GJW-JYPR- I & II LINES TRIPPED 13-Feb-12 12:59

27 13-Feb-12 12:22 HVDC HVDC GAJUWAKA POLE 2 BLOCKED DUE TO GJW-JYPR- I & II LINES TRIPPED 13-Feb-12 13:01

28 13-Feb-12 12:22 400 KV LINE 400 kV JEYPORE - GAZUWAKA 1 TRIPPED ON OVER VOLTAGE 13-Feb-12 12:49

29 13-Feb-12 12:22 400 KV LINE 400 kV JEYPORE - GAZUWAKA 2 TRIPPED ON OVER VOLTAGE 21-Feb-12 5:53

30 16-Feb-12 19:40 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 1 B/B PROTECTION OPERATED DUE TO CT BLAST AT MAMIDAPALLY 16-Feb-12 22:00

31 16-Feb-12 19:30 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 2 R-PH CT FAILURE AT MDPL 17-Feb-12 22:40

32 16-Feb-12 13:14 400 KV LINE 400 kV KOLAR - KALAIVANTHAPATTU DISTANCE PROTECTION 16-Feb-12 13:29

33 18-Feb-12 5:23 400 KV LINE 400 kV HYDERABAD - N'SAGAR B-N FAULT 18-Feb-12 5:38

34 20-Feb-12 17:18 400 KV LINE 400 kV GOOTY - NELAMANGALA B-N FAULT APPROX 11.3 KM FROM (NLM) END 20-Feb-12 17:30


36 20-Feb-12 11:39 220 KV LINE 220 kV SABARGIRI - THENI EARTH FAULT 20-Feb-12 13:53


38 20-Feb-12 11:39 220 KV LINE 220 kV SABARGIRI - THENI EARTH FAULT 20-Feb-12 13:53

39 20-Feb-12 17:18 400 KV LINE 400 kV GOOTY - NELAMANGALA B-N FAULT APPROX 11.3 KM FROM (NLM) END 20-Feb-12 17:30

40 20-Feb-12 12:22 400/230 KV ICT 400/230 kV ICT-1 AT MADURAI BUS BAR PROTECTION OPERATED 20-Feb-12 13:28

41 20-Feb-12 12:22 400/230 KV ICT 400/230 kV ICT-2 AT MADURAI BUS BAR PROTECTION OPERATED 20-Feb-12 13:31



44 22-Feb-12 11:45 220 KV LINE 220 kV GOOTY - ALIPUR LINE Y-PHASE JUMPER CUT 22-Feb-12 21:35

45 22-Feb-12 11:45 220 KV LINE 220 kV GOOTY - ALIPUR LINE Y-PHASE JUMPER CUT 22-Feb-12 21:35

46 24-Feb-12 0:42 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVER LAOD 25-Feb-12 14:01

47 24-Feb-12 0:42 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVER LAOD 25-Feb-12 14:01


49 25-Feb-12 10:05 400 KV LINE 400 kV KHAMMAM - MAMIDIPALLY 2 REACTOR BUSHING ERECTION 25-Feb-12 16:44

50 25-Feb-12 10:05 400 KV LINE 400 kV KHAMMAM - MAMIDIPALLY 2 REACTOR BUSHING ERECTION 25-Feb-12 16:44

51 26-Feb-12 12:23 400 KV LINE 400 kV KALPAKKA - VEMAGIRI 2 R-N FAULT. 26-Feb-12 12:54

Tripping Normalisation


Sl No Date Time Element Type Element Remarks Date Time


52 26-Feb-12 16:18 400 KV LINE 400 kV TRIVENDRUM - TIRUNELVELI 2 B-N FAULT. 26-Feb-12 16:38


54 27-Feb-12 18:03 400/220 KV ICT 400/220 kV ICT-1 AT TALAGUPPA BACK UP OVER CURRENT PROTECTION & E/F RELAY OPERATED 27-Feb-12 18:29



57 27-Feb-12 18:03 400 KV LINE 400 kV TALAGUPPA - NEELAMANGALA DISTANCE PROTECTION OPERATED 28-Feb-12 8:52

58 27-Feb-12 18:05 400 KV LINE 400 kV TALAGUPPA - HASSAN 1 TRIPPED ON O/V 27-Feb-12 18:55


60 27-Feb-12 18:05 400 KV LINE 400 kV TALAGUPPA - HASSAN 1 TRIPPED ON O/V 27-Feb-12 18:55

61 29-Feb-12 12:20 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 2 RECTIFICATION OF AUX. SWITCH OF ISO. AT MDPL END 29-Feb-12 13:28

62 29-Feb-12 15:00 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVER LOAD 29-Feb-12 16:50

63 29-Feb-12 18:05 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVERLOAD 3-Mar-12 10:53

64 29-Feb-12 15:00 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVER LOAD 29-Feb-12 16:50

65 29-Feb-12 18:05 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVERLOAD 3-Mar-12 10:53

66 29-Feb-12 8:07 400/230 KV ICT 400/230 kV ICT-1 AT MADURAI BUS BAR PROTECTION OPERATED AT 220KV SIDE 29-Feb-12 8:55

67 29-Feb-12 8:07 400/230 KV ICT 400/230 kV ICT-2 AT MADURAI BUS BAR PROTECTION OPERATED AT 220KV SIDE 29-Feb-12 8:55

68 29-Feb-12 3:11 400 KV LINE 400 kV KOLAR - KALAIVANTHAPATTU DT RECEIVED AT K' PATTU END. 29-Feb-12 3:28

69 29-Feb-12 3:10 HVDC HVDC TALCHER - KOLAR POLE 2 AT KOLAR POWER SUPPLY FAILURE OF CONTROL SYSTEM OF POLE-II AT KOLAR 29-Feb-12 4:23

70 1-Mar-12 18:29 400 KV LINE 400 Kv UDUMALPET - PALLAKAD 2 BUS CVT PROBLEM 1-Mar-12 20:53

71 1-Mar-12 18:29 400 KV LINE 400 Kv PALLAKAD - TRICHUR 2 BUS CVT PROBLEM 1-Mar-12 21:05

72 2-Mar-12 16:24 400 KV LINE 400 kV GOOTY - NELAMANGALA B-N FAULT 2-Mar-12 16:31

73 2-Mar-12 14:54 400 KV LINE 400 kV KURNOOL - SRISAILAM DISTANCE PROTN OPERATED AT SSLM 2-Mar-12 15:44

74 2-Mar-12 6:06 400 KV LINE 400 kV RAMAGUNDAM - N'SAGAR 2 LINE E/F R-N PH AT Z- 1 MAIN CB & TIE CB TRIPPED 2-Mar-12 6:18

75 2-Mar-12 12:44 400 KV LINE 400 kV MAHABOOB NAGAR - RAICHUR TRIPPED ON R-N FAULT 2-Mar-12 13:45

76 3-Mar-12 12:16 400 KV LINE 400 kV GOOTY - NELAMANGALA D/T RECEIVED FROM NLMG 3-Mar-12 12:28

77 3-Mar-12 18:12 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 2 TRIPPED ON OVER VOLTAGE 3-Mar-12 19:10

78 4-Mar-12 5:05 400 KV LINE 400 kV GUTTUR - NARENDRA 2 DISTANCE PROT. , Y -N FAULT 4-Mar-12 9:30

79 4-Mar-12 4:55 400 KV LINE 400 kV GUTTUR - NARENDRA 1 DISTANCE PROT. ,B - N FAULT 4-Mar-12 5:18

80 4-Mar-12 5:19 400 KV LINE 400 kV GUTTUR - NARENDRA 1 DISTANCE PROT. ,B - N FAULT 4-Mar-12 9:26

81 4-Mar-12 7:00 400 KV LINE 400 kV KAIGA - GUTTUR 2 TRIPPED DUE TO FOG 4-Mar-12 9:47

82 4-Mar-12 6:35 400 KV LINE 400 kV JSW TORANAGALLU-GUTTUR TRIPPED DUE TO FOG 4-Mar-12 21:42

83 5-Mar-12 7:04 400 KV LINE 400 kV GUTTUR - NARENDRA 2 B-N FAULT. 5-Mar-12 10:04

84 7-Mar-12 16:32 220 KV LINE 220 kV AMBEWADI - PONDA 2 DISTANCE PROTECTION OPERATED 10-Mar-12 11:44

85 8-Mar-12 16:22 HVDC HVDC BHADRAVATHI POLE 1 AUX. POWER SUPPLY FAILURE 8-Mar-12 16:58

86 8-Mar-12 16:22 HVDC HVDC BHADRAVATHI POLE 2 AUX. POWER SUPPLY FAILURE 8-Mar-12 17:05

87 8-Mar-12 18:00 400 KV LINE 400 kV VTPS IV - SRISAILAM 1 TRIPPED ON OVER VOLTAGE 8-Mar-12 18:50

88 8-Mar-12 18:00 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 2 TRIPPED ON OVER VOLTAGE 8-Mar-12 22:49

89 9-Mar-12 11:36 400/220 KV ICT 400/220 kV ICT-2 AT KHAMMAM O/C RELAY OPERATED 9-Mar-12 12:02

90 11-Mar-12 14:30 220 KV LINE 220 kV GOOTY - ALIPUR LINE TRIPPED DUE TO R-N FAULT. 11-Mar-12 15:06

91 11-Mar-12 13:24 400 KV LINE 400 kV RAICHUR - BTPS TRIPPED DUE TO R-N FAULT. 11-Mar-12 14:17

92 11-Mar-12 6:17 400 KV LINE 400 kV NEYVELI TS 2 - PUGALUR TRIPPED ON Y-PH - N FAULT 11-Mar-12 7:16

93 12-Mar-12 6:32 220 KV LINE 220 kV AMBEWADI - PONDA 1 DISTANCE PROTECTION OPERATED 12-Mar-12 13:25

94 12-Mar-12 14:36 400 KV LINE 400 Kv TRICHUR - KOCHI 1 DT RECEIVED FROM KOCHIN END. 12-Mar-12 15:05

95 12-Mar-12 7:18 400 KV LINE 400 kV GOOTY - HOODY DUE TO FAULT ON BUS-1 AT HOODY 12-Mar-12 7:51

96 12-Mar-12 7:18 400 KV LINE 400 kV KOLAR - HOODY 1 DUE TO FAULT ON BUS-1 AT HOODY 12-Mar-12 8:31

97 12-Mar-12 7:18 400 KV LINE 400 kV NELAMANGALA - HOODY DUE TO FAULT ON BUS-1 AT HOODY 12-Mar-12 8:15

98 12-Mar-12 14:37 400 KV LINE 400 kV JSW TORANAGALLU-GUTTUR TRIPPED AT GTR END. 12-Mar-12 14:44

99 12-Mar-12 7:18 400/220 KV ICT 400/220 kV ICT-1 AT HOODY TRIPPED DUE TO BUS -I FAULT AT HOODY 12-Mar-12 8:06

100 12-Mar-12 7:18 400/220 KV ICT 400/220 kV ICT-2 AT HOODY TRIPPED DUE TO BUS -I FAULT AT HOODY 12-Mar-12 8:04

101 13-Mar-12 15:33 400 KV LINE 400 kV VIJAYAWADA - VEMAGIRI 3 TRIPPED ON B- PHASE TO N FAULT 14-Mar-12 23:05

102 14-Mar-12 21:21 HVDC HVDC BHADRAVATHI POLE 1 AUXILLARY SUPPLY FAILURE 14-Mar-12 21:50

103 14-Mar-12 21:21 HVDC HVDC BHADRAVATHI POLE 2 AUXILLARY SUPPLY FAILURE 14-Mar-12 21:55




104 14-Mar-12 4:09 400 KV LINE 400 Kv PALLAKAD - TRICHUR 2 TRIPPED REASON AWAITED 14-Mar-12 4:50

105 14-Mar-12 4:09 400 KV LINE 400 Kv UDUMALPET - PALLAKAD 2 TRIPPED REASON AWAITED 14-Mar-12 7:13

106 15-Mar-12 10:00 400 KV LINE 400 kV HYDERABAD - KURNOOL TRIPPED DURING S/D OF BUS-I OPERATION BY POWER GRID 15-Mar-12 10:15

107 15-Mar-12 10:00 400 KV LINE 400 kV HYDERABAD - N'SAGAR TRIPPED DURING S/D OF BUS-I OPERATION BY POWER GRID 15-Mar-12 10:16

108 18-Mar-12 5:54 400 KV LINE 400 kV VIJAYAWADA - NELLORE 1 TRIPPED ON R Y N FAULT 18-Mar-12 18:26

109 18-Mar-12 19:18 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 1 YET TO BE GIVEN 19-Mar-12 6:42

110 19-Mar-12 4:20 220 KV LINE 220 kV IDUKKI - UDUMALPET CONDUCTER SNAPPING AT 8KM FROM UPT END 19-Mar-12 11:29

111 19-Mar-12 9:11 HVDC HVDC GAJUWAKA POLE 1 LOSS OF AC SUPPLY 19-Mar-12 9:34

112 19-Mar-12 9:11 HVDC HVDC GAJUWAKA POLE 2 LOSS OF AC SUPPLY 19-Mar-12 9:39

113 19-Mar-12 9:11 400 KV LINE 400 kV JEYPORE - GAZUWAKA 2 TRIPPED DUE TO EAST SIDE UNBALANCE 19-Mar-12 9:27

114 21-Mar-12 6:29 400 KV LINE 400 kV GUTTUR - NARENDRA 2 B-N FAULT 21-Mar-12 6:54

115 21-Mar-12 5:27 220 KV LINE 220 kV AMBEWADI - PONDA 1 DISTAMCE PROTECTIOM 21-Mar-12 11:45

116 22-Mar-12 6:02 400 KV LINE 400 kV GUTTUR - NARENDRA 1 TRIPPED DUE TO FOG 22-Mar-12 7:05

117 22-Mar-12 5:47 400 KV LINE 400 kV GUTTUR - NARENDRA 1 TRIPPED DUE TO FOG 22-Mar-12 5:59

118 22-Mar-12 14:40 400/230 KV ICT 400/230 kV ICT-1 AT UDUMALPET BUS BAR PROTECTION OPERATED 22-Mar-12 15:09



121 22-Mar-12 13:04 400/220 KV ICT 400/220 kV ICT-1 AT GOOTY TRIPPED DUE TO FIRE AT AP - 220KV SIDE YARD 22-Mar-12 13:47

122 22-Mar-12 13:04 400/220 KV ICT 400/220 kV ICT-2 AT GOOTY TRIPPED DUE TO FIRE AT AP - 220KV SIDE YARD 22-Mar-12 13:47

123 24-Mar-12 6:00 400 KV LINE 400 kV VIJAYAWADA - NELLORE 1 LINE FAULTY 24-Mar-12 15:50

124 25-Mar-12 3:37 400/220 KV ICT 400/220 kV ICT-1 AT VISAKHAPATNAM BUS-I PRTN. OPTD. 25-Mar-12 5:40

125 25-Mar-12 4:24 400/220 KV ICT 400/220 kV ICT-2 AT VISAKHAPATNAM CT BLAST AT VSS 25-Mar-12 5:20

126 25-Mar-12 1:27 400/220 KV ICT 400/220 kV ICT-1 AT VISAKHAPATNAM OVER LOAD PROTECTION OPERATED. 25-Mar-12 1:42

127 25-Mar-12 1:27 400/220 KV ICT 400/220 kV ICT-2 AT VISAKHAPATNAM OVER LOAD PROTECTION OPERATED. 25-Mar-12 1:37

128 25-Mar-12 5:02 400 KV LINE 400 kV VEMAGIRI - SIMHADRI 2 R-N FAULT 25-Mar-12 15:44

129 25-Mar-12 5:11 400 KV LINE 400 kV KHAMMAM - KALPAKKA 1 R-N FAULT 25-Mar-12 15:22

130 25-Mar-12 5:11 400 KV LINE 400 kV KHAMMAM - KALPAKKA 2 R-N FAULT 25-Mar-12 18:25

131 25-Mar-12 2:50 400 KV LINE 400 kV KALPAKKA - GAZUWAKA 1 TRIPPED DUE TO R-Y FAULT. 25-Mar-12 17:16

132 25-Mar-12 6:03 400 KV LINE 400 kV SIMHADRI - GAZUWAKA 2 Y-N FAULT 25-Mar-12 20:12

133 26-Mar-12 16:00 400 KV LINE 400 kV N'SAGAR - MAHABOOB NAGAR TRIPPED ON Y-N FAULT 26-Mar-12 16:14

134 26-Mar-12 17:05 400/220 KV ICT 400/220 kV ICT-1 AT HIRIYUR TRIPPED WHILE CHARGING BTPS-HIRIYUR-2 26-Mar-12 17:20

135 26-Mar-12 17:05 400/220 KV ICT 400/220 kV ICT-2 AT HIRIYUR TRIPPED WHILE CHARGING BTPS-HIRIYUR-2 26-Mar-12 17:23

136 26-Mar-12 17:05 400 KV LINE 400 kV GUTTUR - HIRIYUR 1 TRIPPED WHILE CHARGING BTPS-HIRIYUR-2 26-Mar-12 17:12

137 26-Mar-12 17:05 400 KV LINE 400 kV GUTTUR - HIRIYUR 2 TRIPPED WHILE CHARGING BTPS-HIRIYUR-2 26-Mar-12 17:13

138 27-Mar-12 1:56 220 KV LINE 220 kV KANIAMPET - KADAKOLA DISTANCE PROTECTION 27-Mar-12 16:13

139 28-Mar-12 5:55 400 KV LINE 400 kV GUTTUR - NARENDRA 1 TRIPPED ON B-N FAULT 28-Mar-12 16:56

140 28-Mar-12 15:56 400 KV LINE 400 Kv TRICHUR - KOCHI 1 REASON YET TO BE GIVEN. 28-Mar-12 16:21

141 28-Mar-12 15:56 400 KV LINE 400 Kv TRICHUR - KOCHI 2 REASON YET TO BE GIVEN. 28-Mar-12 16:25

142 28-Mar-12 7:13 400 KV LINE 400 kV GUTTUR - NARENDRA 2 R-N FAULT 28-Mar-12 18:03

143 29-Mar-12 15:00 220 KV LINE 220 kV IDUKKI - UDUMALPET EARTH FAULT 29-Mar-12 15:46

144 30-Mar-12 5:20 HVDC HVDC GAJUWAKA POLE 1 LOSS OF AC REFERENCE VOL 30-Mar-12 6:11

145 30-Mar-12 5:20 HVDC HVDC GAJUWAKA POLE 2 LOSS OF AC REFERENCE VOL 30-Mar-12 6:11

146 30-Mar-12 14:47 400/220 KV ICT 400/220 kV ICT-1 AT HYDERABAD TRIPPED DUE TO 220KV AP YARD FIRE OCCURED 30-Mar-12 17:30

147 30-Mar-12 5:20 400 KV LINE 400 kV JEYPORE - GAZUWAKA 1 TRIPPED DUE TO O/V 1-Apr-12 12:21

148 30-Mar-12 5:20 400 KV LINE 400 kV JEYPORE - GAZUWAKA 2 TRIPPED DUE TO O/V 30-Mar-12 6:04

149 31-Mar-12 23:06 400/220 KV ICT 400/220 kV ICT-2 AT TALAGUPPA PRV OPERATED. 1-Apr-12 0:15

150 2-Apr-12 18:10 400 KV LINE 400 kV N'SAGAR - MAHABOOB NAGAR R-N FAULT 2-Apr-12 18:25

151 2-Apr-12 15:14 220 KV LINE 220 kV AMBEWADI - PONDA 1 BUS FAULT @AMBEVADI 2-Apr-12 17:24

152 3-Apr-12 11:02 400 KV LINE 400 kV KAIGA - GUTTUR 1 PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 11:49

153 3-Apr-12 11:02 400 KV LINE 400 kV KAIGA - GUTTUR 2 PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 13:32

154 3-Apr-12 11:02 400 KV LINE 400 kV KAIGA - NARENDRA 1 PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 12:45

155 3-Apr-12 11:02 400 KV LINE 400 kV KAIGA - NARENDRA 2 PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 13:09




156 3-Apr-12 11:24 400/220 KV ICT 400/220 kV ICT-1 AT NARENDRA PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 11:42

157 3-Apr-12 11:24 400/220 KV ICT 400/220 kV ICT-2 AT NARENDRA PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 11:56

158 3-Apr-12 11:02 400 KV LINE 400 kV GUTTUR - HIRIYUR 2 PARTIAL DISTURBANCE IN GTR AREA 3-Apr-12 11:48

159 3-Apr-12 11:02 400 KV LINE 400 kV GUTTUR - HIRIYUR 1 PARTIAL DISTURBANCE IN GTR AREA 3-Apr-12 12:01

160 3-Apr-12 11:02 400 KV LINE 400 kV MUNIRABAD - GUTTUR PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 13:38

161 3-Apr-12 11:02 220 KV LINE 220 kV KAIGA - KADRA 1 PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 12:45

162 3-Apr-12 11:02 220 KV LINE 220 kV KAIGA - KODASALLY PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 12:01

163 3-Apr-12 11:02 220 KV LINE 220 kV AMBEWADI - PONDA 1 PARTIAL GRID DISTURBACE IN GTR AREA 3-Apr-12 12:39

164 3-Apr-12 11:02 400 KV LINE 400 kV BTPS-JSW TORANAGALLU PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 11:55

165 3-Apr-12 11:02 400 KV LINE 400 kV RAICHUR - BTPS PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 11:39

166 3-Apr-12 11:02 400/220 KV ICT 400/220 kV ICT-1 AT GUTTUR PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 11:27

167 3-Apr-12 11:02 400/220 KV ICT 400/220 kV ICT-2 AT GUTTUR PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 11:29

168 3-Apr-12 11:02 400/220 KV ICT 400/220 kV ICT-1 AT KAIGA PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 11:49

169 3-Apr-12 11:02 400/220 KV ICT 400/220 kV ICT-2 AT KAIGA PARTIAL GRID DISTURBANCE AT GTR AREA 3-Apr-12 13:42

170 3-Apr-12 11:02 400 KV LINE 400 kV JSW TORANAGALLU-GUTTUR PARTIAL GRID DISTURBANCE IN GTR AREA 3-Apr-12 11:55

171 4-Apr-12 15:59 220 KV LINE 220 kV SEDAM - TANDUR TRIPPED AT SDM END. 4-Apr-12 16:25

172 4-Apr-12 18:47 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 1 TRIPPED ON OVER VOLTAGE 5-Apr-12 4:45

173 5-Apr-12 5:49 400 KV LINE 400 kV VIJAYAWADA - NELLORE 2 TRIPPED ON R-N FAULT 5-Apr-12 6:07

174 5-Apr-12 6:29 400 KV LINE 400 kV VIJAYAWADA - NELLORE 1 TRIPPED ON B-N FAULT 5-Apr-12 12:56

175 5-Apr-12 6:29 400 KV LINE 400 kV VIJAYAWADA - NELLORE 2 TRIPPED ON R-N FAULT 5-Apr-12 14:03

176 5-Apr-12 13:06 400 KV LINE 400 kV TALAGUPPA - HASSAN TRIPPED BY CHARGING TAL-NLM 5-Apr-12 13:43

177 5-Apr-12 13:06 400/220 KV ICT 400/220 kV ICT-1 AT TALAGUPPA TRIPPED BY CHARGING TAL-NLM 5-Apr-12 13:36

178 5-Apr-12 13:06 400/220 KV ICT 400/220 kV ICT-2 AT TALAGUPPA TRIPPED BY CHARGING TAL-NLM 5-Apr-12 14:22

179 6-Apr-12 13:13 220 KV LINE 220 kV CHITTOR - THIRUVALEM DISTANCE PROTECTION OPERATED. 6-Apr-12 13:40

180 6-Apr-12 14:50 220 KV LINE 220 kV IDUKKI - UDUMALPET THREE PHASE FAULT 6-Apr-12 16:16

181 6-Apr-12 15:31 220 KV LINE 220 kV SABARGIRI - THENI BUS BAR PROTECTION OPERATED AT SBG END 6-Apr-12 16:24

182 8-Apr-12 18:32 220 KV LINE 220 kV EDAMON - EDAPPON TRIPEED DUE TO DISTURBANCE IN EDAMON S/S 8-Apr-12 19:23

183 8-Apr-12 14:21 400 KV LINE 400 kV BTPS-JSW TORANAGALLU DISTANCE PROTECTION 8-Apr-12 15:08

184 8-Apr-12 23:45 400 KV LINE 400 kV TALAGUPPA - HASSAN TRIPPED AT TLG END 9-Apr-12 1:04

185 8-Apr-12 23:45 400/220 KV ICT 400/220 kV ICT-1 AT TALAGUPPA TRIPPED DUE TO TRIPPING OF 220KV SHVT LINES. 9-Apr-12 1:02

186 8-Apr-12 23:45 400 KV LINE 400 kV TALAGUPPA - HASSAN TRIPPED AT TLG END 9-Apr-12 1:04

187 8-Apr-12 23:45 400/220 KV ICT 400/220 kV ICT-1 AT TALAGUPPA TRIPPED DUE TO TRIPPING OF 220KV SHVT LINES. 9-Apr-12 1:02

188 10-Apr-12 3:35 400 KV LINE 400 kV N'SAGAR - MAHABOOB NAGAR B-N FAULT 10-Apr-12 11:40

189 10-Apr-12 17:15 220 KV LINE 220 kV EDAMON - EDAPPON TRIPPED DUE TO LIGHTNING 10-Apr-12 17:24

190 10-Apr-12 17:14 220 KV LINE 220 kV EDAMON - TIRUNELVELI 2 TRIPPED DUE TO D/T RECEIVED FROM EDAMON 10-Apr-12 17:24

191 10-Apr-12 16:40 220 KV LINE 220 kV IDUKKI - UDUMALPET TRIPPED DUE TO INSULATOR PROBLEM 11-Apr-12 18:18

192 11-Apr-12 10:25 400 KV LINE 400 Kv PALLAKAD - TRICHUR 2 PLCC MAL OPERATION 11-Apr-12 10:42

193 11-Apr-12 11:33 220 KV LINE 220 kV EDAMON - KUNDRA CONTROL SUPPLY PROBLEM AT EDAMON 11-Apr-12 12:15

194 11-Apr-12 15:33 400 KV LINE 400 kV RAMAGUNDAM - N'SAGAR 1 DC POWER SUPPLY FAILURE TO RELAY 11-Apr-12 15:56

195 12-Apr-12 0:36 400 KV LINE 400 kV NELAMANGALA - MYSORE 1 TRANSIENT FAULT 12-Apr-12 0:41

196 12-Apr-12 20:34 220 KV LINE 220 kV SEDAM - TANDUR TRIPPED DUE TO B-N FAULT. 13-Apr-12 13:17

197 13-Apr-12 12:04 220 KV LINE 220 kV EDAMON - TIRUNELVELI 1 TRIPPED WHILE TESTING AT EDAMON 13-Apr-12 12:09

198 13-Apr-12 19:07 400 KV LINE 400 kV JEYPORE - GAZUWAKA 1 TRIPPED ON OVER VOLTAGE 13-Apr-12 22:47

199 13-Apr-12 11:09 220 KV LINE 220 kV IDUKKI - UDUMALPET TRIPPED AT IDUKKI END B/B PROTECTION OPERATED 13-Apr-12 12:02

200 14-Apr-12 9:47 400 KV LINE 400 kV KOLAR - HOODY 2 TRIPPED WHILE AVAILING BUS-I S/D AT HDY S/S 14-Apr-12 10:01

201 14-Apr-12 15:04 400 KV LINE 400 kV KAIGA - GUTTUR 2 Y-PHASE DISTANCE PROTECTION 14-Apr-12 15:44

202 14-Apr-12 17:52 400 KV LINE 400 kV MADURAI - TIRUNELVELI 2 D/T RECEIVED AT MADURAI END 14-Apr-12 18:03

203 14-Apr-12 12:13 220 KV LINE 220 kV AMBEWADI - PONDA 1 TRIPPED ON EFR 14-Apr-12 19:20

204 14-Apr-12 16:46 220 KV LINE 220 kV IDUKKI - UDUMALPET DUE TO BUS BAR PROTECTION OPERATED AT IDUKKI 14-Apr-12 17:31

205 15-Apr-12 14:46 400 KV LINE 400 kV KAIGA - GUTTUR 1 DISTANCE PROTECTION 15-Apr-12 15:09

206 15-Apr-12 1:59 400 KV LINE 400 Kv HIRIYUR-BTPS 2 DISTANCE PROTECTION OPERATED AT BTPS. 16-Apr-12 11:45

207 15-Apr-12 18:02 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 2 TRIPPED ON OVER VOLTAGE 15-Apr-12 19:28




208 15-Apr-12 18:05 220 KV LINE 220 kV SABARGIRI - THENI PT BLAST AT THENI END 18-Apr-12 21:54

209 15-Apr-12 1:59 400 KV LINE 400 Kv HIRIYUR-BTPS 2 DISTANCE PROTECTION OPERATED AT BTPS. 16-Apr-12 11:45

210 15-Apr-12 18:05 220 KV LINE 220 kV SABARGIRI - THENI PT BLAST AT THENI END 18-Apr-12 21:54

211 16-Apr-12 3:46 400/220 KV ICT 400/220 kV ICT-1 AT KHAMMAM BUS BAR PROTECTION OPERATED AT 220 KV SIDE 16-Apr-12 7:04

212 16-Apr-12 3:46 400/220 KV ICT 400/220 kV ICT-2 AT KHAMMAM BUS BAR PROTECTION OPERATED AT 220 KV SIDE 16-Apr-12 7:05

213 16-Apr-12 12:16 400 KV LINE 400 Kv BANGALORE - BIDADI 1 DIRECT TRIP SENT FROM BDD. 16-Apr-12 13:06

214 16-Apr-12 12:41 400 KV LINE 400 kV KOLAR - HOSUR 2 B - PH TO N FAULT 16-Apr-12 12:53

215 16-Apr-12 18:00 400 KV LINE 400 Kv TRICHUR - KOCHI 1 R-N FAULT 16-Apr-12 18:20

216 16-Apr-12 18:00 400 KV LINE 400 Kv TRICHUR - KOCHI 2 R-N FAULT 16-Apr-12 18:25

217 16-Apr-12 13:22 400 KV LINE 400 kV VTPS IV - SRISAILAM 2 R-N FAULT 16-Apr-12 16:07

218 16-Apr-12 17:53 400 KV LINE 400 Kv HIRIYUR-BTPS 2 DISTANCE PROTECTION 19-Apr-12 16:47

219 17-Apr-12 13:35 400 KV LINE 400 kV GUTTUR - NARENDRA 1 TRIPPED AT GUTTUR END DUE TO CONTROL SUPPLY PROBLEM 17-Apr-12 14:01

220 17-Apr-12 17:48 400 KV LINE 400 kV NEYVELI TS 1 (EXP) - TRICHY B/B PROTECTION OPERATED AT NLYTSIEXP 17-Apr-12 19:09

221 17-Apr-12 17:48 400 KV LINE 400 kV NEYVELI TS2- NEYVELI TS-I (EXP) B/B PROTECTION OPERATED AT NLYTSIEXP 17-Apr-12 22:17

222 17-Apr-12 12:25 400 KV LINE 400 kV VTPS IV - SRISAILAM 2 R-PH - N FAULT 17-Apr-12 17:17

223 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS2- NEYVELI TS-I (EXP) B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 10:43

224 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS 2 - TRICHY B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 10:09

225 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS 2- SALEM 1 B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 9:57

226 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS 2- SALEM 2 B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 10:21

227 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS 2 - PUGALUR B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 10:48

228 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS 2 (EXP) - PUGALUR B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 10:48

229 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS 2- PONDICHERY B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 15:05

230 18-Apr-12 9:23 400 KV LINE 400 kV NEYVELI TS2- NEYVELI TS-2 (EXP) B/B PROTECTION OPERATED AT NLY TSII 18-Apr-12 15:05

231 18-Apr-12 17:46 400 KV LINE 400 kV KAIGA - GUTTUR 1 Y-N FAULT 18-Apr-12 18:20

232 18-Apr-12 18:07 400/220 KV ICT 400/220 kV ICT-1 AT MUNIRABAD TRIPPED DUE TO TRIPPING AT LV SIDE 18-Apr-12 18:55

233 18-Apr-12 18:07 400/220 KV ICT 400/220 kV ICT-2 AT MUNIRABAD DUE TO TRIPPING OF LV SIDE 18-Apr-12 19:03

234 18-Apr-12 13:01 400 KV LINE 400 kV GUTTUR - HIRIYUR 2 PLCC MAL OPERATION 18-Apr-12 13:02

235 18-Apr-12 14:20 220 KV LINE 220 kV SEDAM - TANDUR DUE TO TRIPPING AT SDM 18-Apr-12 15:12

236 19-Apr-12 15:34 400 KV LINE 400 kV RAMAGUNDAM - CHANDRAPUR 2 DUE TO NON OPERATION OF Y PHASE AUTO RECLOSE at RGM end 19-Apr-12 16:24

237 20-Apr-12 21:49 400 KV LINE 400 kV TIRUNELVELI - KUDAMKULAM 1 TRIPPED ON OVER VOLTAGE 20-Apr-12 23:34

238 20-Apr-12 21:39 220 KV LINE 220 kV EDAMON - EDAPPON TRIPPED AT EDAPON DUE TO CB PROBLEM 20-Apr-12 22:13

239 20-Apr-12 12:25 220 KV LINE 220 kV SEDAM - TANDUR TRIPPED DUE TO JUMPER CUT AT SDM 20-Apr-12 16:40

240 20-Apr-12 15:30 220 KV LINE 220 kV IDUKKI - UDUMALPET DISTANCE PROTECTION OPERATED 21-Apr-12 13:55

241 20-Apr-12 19:26 400/220 KV ICT 400/220 kV ICT-2 AT TRICHUR DIFFERENTIAL PROTECTION OPERATED 21-Apr-12 15:40

242 21-Apr-12 19:31 400 KV LINE 400 kV UDUMALPET - ARASUR 2 TRIPPED DURING CB MAINTENANCE WORKS AT UDMP END. 21-Apr-12 19:35

243 21-Apr-12 14:13 400 KV LINE 400 kV KHAMMAM - KALPAKKA 1 TRIPPED DUE TO Y-N FAULT. 21-Apr-12 14:48

244 22-Apr-12 14:32 HVDC HVDC TALCHER - KOLAR POLE 1 AT KOLAR COMMUTATION FAILURE DUE TO DISTURBANCE IN AC NETWORK 22-Apr-12 15:08

245 22-Apr-12 14:32 HVDC HVDC TALCHER - KOLAR POLE 2 AT KOLAR COMMUTATION FAILURE DUE TO DISTURBANCE IN AC NETWORK 22-Apr-12 15:02

246 22-Apr-12 14:32 400/220 KV ICT 400/220 kV ICT-1 AT BANGALORE CT BLAST AT SMN END BUS BAR PROT. OPRTD AT 220KV SIDE. 22-Apr-12 15:23

247 22-Apr-12 14:32 400/220 KV ICT 400/220 kV ICT-2 AT BANGALORE CT BLAST AT SMN END BUS BAR PROT. OPRTD AT 220KV SIDE. 22-Apr-12 15:24

248 22-Apr-12 18:43 400 KV LINE 400 kV GOOTY - NELAMANGALA B-PH TO N FAULLT 22-Apr-12 19:15

249 22-Apr-12 18:43 FSC GOOTY-NELAMANGALA AT GOOTY DUE TO TRIPPING OF GTY - NLM LINE 22-Apr-12 19:16

250 22-Apr-12 19:37 400 KV LINE 400 kV GOOTY - NELAMANGALA DIRECT TRIP RECEIVED AT GTY END 22-Apr-12 19:50

251 22-Apr-12 19:37 FSC GOOTY-NELAMANGALA AT GOOTY TRIPPED DUE TO GTY - NLM LINE 22-Apr-12 19:51

252 22-Apr-12 23:21 400 KV LINE 400 kV GOOTY - HOODY B-N FAULT TRIPPED AT HOODY ONLY 22-Apr-12 23:32

253 22-Apr-12 12:40 220 KV LINE 220 kV AMBEWADI - PONDA 2 DEFR OPERATED 22-Apr-12 12:55

254 23-Apr-12 9:05 400 KV LINE 400 kV VEMAGIRI - SIMHADRI 1 TRIPPED AT SIM END 23-Apr-12 9:23

255 25-Apr-12 21:33 400 KV LINE 400 kV VIJAYAWADA - NELLORE 1 DECLARED FAULTY 26-Apr-12 7:52

256 26-Apr-12 17:33 400 KV LINE 400 Kv TRICHUR - KOCHI 2 TRIPPED AT KOCHI END DUE TO LIGTHENING 26-Apr-12 17:50

257 27-Apr-12 17:44 400 KV LINE 400 kV GUTTUR - NARENDRA 1 BUS FAULT AT GTR DUE TO LA FLASH OVER 27-Apr-12 18:12

258 27-Apr-12 17:44 400 KV LINE 400 kV GUTTUR - NARENDRA 2 BUS FAULT AT GTR DUE TO LA FLASH OVER 27-Apr-12 18:42

259 27-Apr-12 17:44 400 KV LINE 400 kV KAIGA - GUTTUR 1 BUS FAULT AT GTR DUE TO LA FLASH OVER 27-Apr-12 18:19




260 27-Apr-12 17:44 400 KV LINE 400 kV KAIGA - GUTTUR 2 BUS FAULT AT GTR DUE TO LA FLASH OVER 27-Apr-12 18:51

261 27-Apr-12 17:23 400 KV LINE 400 kV GUTTUR - NARENDRA 1 TRIPPED DUE TO Y-N FAULT 27-Apr-12 17:35

262 27-Apr-12 17:44 400 KV LINE 400 kV GUTTUR - HIRIYUR 1 BUS FAULT AT GTR DUE TO LA FLASH OVER 27-Apr-12 18:04

263 27-Apr-12 17:44 400 KV LINE 400 kV BTPS-JSW TORANAGALLU BUS FAULT DUE TO LA FAILURE 27-Apr-12 18:19

264 27-Apr-12 17:44 400 KV LINE 400 kV MUNIRABAD - GUTTUR TRIPPED DUE TO BUS FAULT AT GTR DUE TO LA FAILURE 27-Apr-12 18:27

265 27-Apr-12 17:44 400 KV LINE 400 kV GUTTUR - HIRIYUR 2 TRIPPED DUE TO LA FLASH OVER 28-Apr-12 22:06

266 28-Apr-12 0:55 400 KV LINE 400 Kv HIRIYUR-BTPS 2 DISTANCE PROTECTION @ BTPS 28-Apr-12 1:21

267 29-Apr-12 16:34 400 KV LINE 400 kV GOOTY - NELAMANGALA LA AT NLM END OF NLM-TAL LINE BLASTED 29-Apr-12 16:57

268 29-Apr-12 16:34 400 KV LINE 400 kV HASSAN - NEELAMANGALA 1 LA AT NLM END OF NLM-TAL LINE BLASTED 29-Apr-12 17:01

269 29-Apr-12 5:43 400 KV LINE 400 kV KAIGA - GUTTUR 2 MAIN I & MAIN II PROTECTION OPERATED AT GUTTUR 29-Apr-12 7:15

270 29-Apr-12 19:23 400 KV LINE 400 kV VIJAYAWADA - NELLORE 1 TRIPPED DUE TO R-B FAULT 30-Apr-12 4:22

271 29-Apr-12 6:00 220 KV LINE 220 kV IDUKKI - UDUMALPET R-N FAULT 29-Apr-12 6:43

272 29-Apr-12 8:33 220 KV LINE 220 kV KANIAMPET - KADAKOLA TRIPPED AT KADKOLA END 29-Apr-12 8:40

273 30-Apr-12 16:27 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVER LOAD 30-Apr-12 18:22

274 1-May-12 17:47 HVDC HVDC TALCHER - KOLAR POLE 1 AT TALCHER DC LINE FAULT 1-May-12 17:58

275 1-May-12 17:24 400 KV LINE 400 kV KHAMMAM - MAMIDIPALLY 2 R-PH TO N FAULT 1-May-12 18:26

276 2-May-12 11:30 400 KV LINE 400 kV TALAGUPPA - NEELAMANGALA DISTANCE PROTECTION 4-May-12 11:00

277 2-May-12 1:02 FSC GOOTY-NELAMANGALA AT GOOTY TRIPPED 2-May-12 2:16

278 2-May-12 1:02 400 KV LINE 400 kV HASSAN - NEELAMANGALA 1 TRIPPED ON O/V 2-May-12 6:38

279 2-May-12 1:02 400 KV LINE 400 Kv BANGALORE - BIDADI 2 TRIPPED ON R-Y FAULT 2-May-12 1:21

280 3-May-12 9:54 400 KV LINE 400 kV VEMAGIRI - KONASEEMA 1 LC BY AP FOR REPLACEMENT OF INSULATORS 3-May-12 13:41

281 4-May-12 17:39 400 KV LINE 400 kV ALAMATHI - VALLUR 2 TRIPPED AT VALLUR END 4-May-12 17:59

282 4-May-12 18:02 220 KV LINE 220 kV IDUKKI - UDUMALPET TRIPPED ON EARTH FAULT 4-May-12 19:01

283 5-May-12 17:11 400 KV LINE 400 kV KHAMMAM - KALPAKKA 1 TRIPPED DUE TO R-N FAULT 5-May-12 19:38

284 5-May-12 17:11 400 KV LINE 400 kV KHAMMAM - MAMIDIPALLY 2 TRIPPED DUE TO TRIPPING OF KHM-KALPAKA 5-May-12 17:23

285 7-May-12 15:31 400 KV LINE 400 kV ALAMATHI - VALLUR 1 BREAKER MAINT AT VALLUR 7-May-12 17:13

286 7-May-12 17:20 400 KV LINE 400 kV SPDR - VALLUR 2 CB MAINTENANCE AT VALLUR 7-May-12 18:18

287 8-May-12 18:12 400 KV LINE 400 kV VIJAYAWADA - VTPS IV 2 LBB PROTECTION OPERATED AT VTPS END 8-May-12 21:58

288 8-May-12 18:12 400 KV LINE 400 kV VIJAYAWADA - VTPS IV 1 TRIPPED DUE TO LBB OPERATED AT VTPS-VJA-II 8-May-12 19:30

289 8-May-12 18:12 400 KV LINE 400 kV VTPS IV - SRISAILAM 1 TRIPPED DUE TO LBB OPERATED AT VTPS-VJA-II 8-May-12 22:55

290 8-May-12 18:12 400 KV LINE 400 kV VTPS IV - SRISAILAM 2 TRIPPED DUE TO LBB OPERATED AT VTPS-VJA-II 8-May-12 19:40

291 9-May-12 16:52 400/220 KV ICT 400/220 Kv ICT-2 AT MALKARAM TRIPPED ALONG WITH RGDM -MLKRM LINE (R-N FAULT) 9-May-12 17:49

292 9-May-12 16:52 400 KV LINE 400 kV RAMAGUNDAM - MALKARAM TRIPPED ON R-PH TO N FAULT 9-May-12 17:25

293 10-May-12 13:01 400 KV LINE 400 kV NELLORE - ALAMATHI 2 R-PH - N FAULLT 10-May-12 16:07

294 10-May-12 14:07 220 KV LINE 220 kV PGCL-POTHENCODE-2 DIR.O.C ACTED 10-May-12 14:30

295 10-May-12 19:15 400 KV LINE 400 kV NEYVELI TS 2 - TRICHY R-N FAULT 11-May-12 12:50

296 10-May-12 14:07 220 KV LINE 220 kV PGCL-POTHENCODE-4 R-N FAULT 10-May-12 18:09

297 10-May-12 23:11 400 KV LINE 400 kV HASSAN - NEELAMANGALA 1 TRIPPED AT NLM END 10-May-12 23:20

298 10-May-12 13:00 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVER LOAD 11-May-12 12:06

299 10-May-12 3:18 400 KV LINE 400 kV KHAMMAM - KALPAKKA 2 TRIPPED ON REACTOR FAULT 12-May-12 15:00

300 10-May-12 19:08 400 KV LINE 400 kV NEYVELI TS2- NEYVELI TS-2 (EXP) TRIPPED ON ZONE I FAULT 10-May-12 20:19

301 11-May-12 13:20 400 KV LINE 400 kV NELLORE - ALAMATHI 2 R-N FAULT 11-May-12 13:24

302 12-May-12 23:23 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 1 R N FAULT 13-May-12 0:12

303 12-May-12 2:09 220 KV LINE 220 kV AMBEWADI - PONDA 1 DIRECTIONAL OVER CURRENT PROTECTION OPERATED 12-May-12 2:58

304 12-May-12 2:09 220 KV LINE 220 kV AMBEWADI - PONDA 2 DIRECTIONAL OVER CURRENT PROTECTION OPERATED 12-May-12 4:22

305 12-May-12 22:41 400 KV LINE 400 kV KHAMMAM - KTPS 1 R N FAULT 12-May-12 23:13

306 12-May-12 5:29 400 KV LINE 400 kV UDUMALPET - TIRUNELVELI 1 TRIPPED ON B-N FAULT 12-May-12 5:37

307 12-May-12 15:50 400 KV LINE 400 kV VIJAYAWADA - NELLORE 1 TRIPPED ON B-N FAULT 12-May-12 16:06

308 12-May-12 15:32 400 KV LINE 400 kV HYDERABAD - KURNOOL TRIPPED ON Y-N FAULT 13-May-12 10:08

309 13-May-12 20:03 400 KV LINE 400 kV HASSAN - NEELAMANGALA 1 TRIPPED ON B PHASE FAULT 23-May-12 23:16

310 13-May-12 20:03 400 KV LINE 400 kV TALAGUPPA - NEELAMANGALA TRIPPED ON B PHASE FAULT 23-May-12 19:36

311 13-May-12 0:16 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 2 TRIPPED ON OVER VOLTAGE 13-May-12 10:42




312 13-May-12 18:02 400 KV LINE 400 kV SRISAILAM-MAMIDIPALLI 2 TRIPPED ON OVER VOLTAGE 14-May-12 9:29

313 13-May-12 0:28 400 KV LINE 400 kV WARANGAL - KHAMMAM Y N FAULT 13-May-12 10:46

314 14-May-12 16:19 400 KV LINE 400 kV N'SAGAR - GOOTY B-N FAULT 14-May-12 16:31

315 14-May-12 6:05 220 KV LINE 220 kV AMBEWADI - PONDA 2 TRANSIENT FAULT 14-May-12 6:35

316 14-May-12 20:45 400 KV LINE 400 kV KAIGA - GUTTUR 1 Y-B FAULT 15-May-12 8:33

317 15-May-12 13:48 400 KV LINE 400 kV KAIGA - GUTTUR 1 L A FLASHOVER AT KAIGA END 16-May-12 22:02

318 16-May-12 3:22 400 KV LINE 400 kV GOOTY - NELAMANGALA Y-N FAULT 16-May-12 3:42

319 17-May-12 15:14 400 KV LINE 400 kV KHAMMAM - KALPAKKA 2 R N FAULT 17-May-12 22:37

320 17-May-12 10:24 400 KV LINE 400 kV KAIGA - GUTTUR 1 REPL OF PILOT STRING INSULATOR 17-May-12 11:10

321 17-May-12 12:50 400 KV LINE 400 kV RAMAGUNDAM - N'SAGAR 2 TRIPPRD ON B -N FAULT 17-May-12 13:06

322 19-May-12 19:41 400/220 KV ICT 400/220 kV ICT-1 AT GOOTY FAULT/BLAST IN APTRANSCO SYSTEM 19-May-12 20:09

323 19-May-12 19:41 400/220 KV ICT 400/220 kV ICT-2 AT GOOTY FAULT/BLAST IN APTRANSCO SYSTEM 19-May-12 20:09

324 19-May-12 16:13 HVDC HVDC TALCHER - KOLAR LINE 2 LINE FAULT 19-May-12 16:21

325 20-May-12 15:37 400 KV LINE 400 kV MUNIRABAD - GUTTUR TRIPPED DUE TO LA BLAST ON Y PHASE 21-May-12 13:14

326 20-May-12 0:49 400 KV LINE 400 kV VIJAYAWADA - VEMAGIRI 3 TRIPPED DUE TO Y-N FAULT 20-May-12 18:35

327 21-May-12 15:42 400/220 KV ICT 400/220 kV ICT-1 AT KHAMMAM B/B PROTECTION OPERATED AT KHM 21-May-12 16:40

328 21-May-12 15:42 400/220 KV ICT 400/220 kV ICT-2 AT KHAMMAM B/B PROTECTION OPERATED AT KHM 21-May-12 16:43

329 21-May-12 15:44 220 KV LINE 220 kV EDAMON - TIRUNELVELI 1 D/T RECEIVED AND TRIPPED AT TNLV END ONLY 21-May-12 15:46



332 21-May-12 17:56 400 KV LINE 400 kV NEYVELI TS 2 - PUGALUR PLCC PROBLEM 21-May-12 18:21

333 21-May-12 12:22 400 KV LINE 400 kV KHAMMAM - KALPAKKA 2 R-N FAULT 21-May-12 13:55

334 21-May-12 14:58 220 KV LINE 220 kV IDUKKI - UDUMALPET TRIPPED DUE TO LIGHTENING 21-May-12 15:47

335 23-May-12 4:56 400 KV LINE 400 kV RAICHUR - BTPS PLCC MAL OPERTION 23-May-12 5:56

336 23-May-12 4:56 400 KV LINE 400 kV BTPS-JSW TORANAGALLU PLCC MAL OPERTION 23-May-12 5:56

337 23-May-12 9:02 220 KV LINE 220 kV AMBEWADI - PONDA 1 REPL OF JUMPERS 23-May-12 17:56

338 23-May-12 7:08 400 KV LINE 400 kV KHAMMAM - KALPAKKA 2 TRIPPPED AT KHAMAM END 23-May-12 7:18

339 25-May-12 2:30 400 KV LINE 400 kV KHAMMAM - KALPAKKA 2 PROTECTION TRIP 25-May-12 6:16

340 25-May-12 9:28 400 KV LINE 400 kV DICHIPALLY - RAMAGUNDAM TRIPPED ON DISTANCE PROTECTION 25-May-12 10:32

341 26-May-12 0:25 220 KV LINE 220 kV AMBEWADI - PONDA 1 LINE TRIPPED DUE TO PHASE - PHASE TO FAULT 26-May-12 13:50

342 26-May-12 5:46 400 KV LINE 400 kV VIJAYAWADA - GAZUWAKA 1 TRIPPED DUE TO B-N FAULT AT VIJ END 26-May-12 5:51

343 26-May-12 5:46 400 KV LINE 400 kV KALPAKKA - VEMAGIRI 2 TRIPPED DUR TO Y-B FAULT 26-May-12 16:04

344 27-May-12 2:07 220 KV LINE 220 kV AMBEWADI - PONDA 1 DEFR OPERATED 27-May-12 18:03

345 27-May-12 15:53 400 KV LINE 400 kV RAMAGUNDAM - GAJWEL R-N FAULT 27-May-12 16:14

346 28-May-12 16:54 400 KV LINE 400 kV VIJAYAWADA - GAZUWAKA 1 TRIPPED ON R-Y-N FAULT 28-May-12 17:05

347 29-May-12 11:45 400 KV LINE 400 kV KHAMMAM - N'SAGAR R-N FAULT 29-May-12 11:57

348 29-May-12 9:39 400 KV LINE 400 kV RAICHUR - MUNIRABAD R-PH CT BLAST AT RAICHUR END 29-May-12 10:41

349 29-May-12 9:42 400 KV LINE 400 kV RAICHUR - BTPS R-PH CT BLAST AT RAICHUR END 29-May-12 10:18

350 31-May-12 18:33 400 KV LINE 400 kV DICHIPALLY - RAMAGUNDAM B-N FAULT 31-May-12 19:30

351 31-May-12 14:55 220 KV LINE 220 kV GUMMUDIPUNDI - SULLURPET TRIPPED ON OVER LOAD 31-May-12 15:08

LOGIC AT NELAMANGALA FOR SPS ON NELAMANGALA-HIRIYUR-BTPS-JINDAL CORRIDOR

CURRENT IR OR IY GREATER

LINE CURRENT IR

BOTH I1>=1150A & I1<=1450A

AND I2>=1150A & I2<=1450A

I1

NELMANGALA-

HIRIYUR LINE-1LINE CURRENT IY

CURRENT <=150A

CURRENT IR OR IY OR IB GREATER

CURRENT >=1150A & <=1450A

CURRENT >1450A

LINE CURRENT IB

I1 >=1150A & <=1450A OR I1<=150A

LINE CURRENT IRCURRENT IR OR IY GREATER

DELAY OF 2 SEC

I1 >1300A OR I1<150A

I1 (>=1150A & <=1450A) OR I1<=150A

AND I2 (>=1150A & <=1450A ) OR I2<=150A

TRIP EXTENDED THROUGH PLCC

TO JINDAL TO TRIP MAX GEN

I2

NELMANGALA-

HIRIYUR LINE-2LINE CURRENT IY

LINE CURRENT IB

CURRENT >=1150A & <=1450A

CURRENT <=150A

CURRENT >1450A

I 2>=1150A & <=1450A OR I2<=150ACURRENT IR OR IY OR IB GREATER

I2 >1450A OR I2<=150A

DELAY OF 2 SEC

BOTH I1<=150 & I2<=150

BOTH I1>1450A AND I2>1450A

I1 >1450A OR I1<=150A

AND I2 >1450A OR I2<=150A

TRIP EXTENDED THROUGH PLCC

TO BTPS TO TRIP MAX GEN OF 2

UNITS

ANNEXURE VI

STATUS OF BUS BAR PROTECTION FOR SOUTHERN REGIONAL CONSTITUENTSSTATETANSCO/GENCO

Make Settings Make SettingsRemarks

Bus bar Protection DetailsS.No Name of Substation

LBB Protection Details

ANNEXURE VII

S.NoTRANSCO/GENCO/ISGS

Name of the Line (From / To / Ownership etc)

Remarks

Yes No Yes No Yes No Yes No Yes No Yes No

Back Up Protection

Over Voltage Protection

Main II Protection (with

Type)

Single Phase Auto

Reclosing facility

Main I Protection (with Type)

Carrier Scheme

A. Generator data to be filled in the format given below

depending type of generator along with following data: 1. Generator capability curve.

2. Make of Generator.

3. Generator type: Gas/Steam/Hydro.

4. Machine MVA rating and p.u Source impedance on MVA Base.

5. Generator Transformer Details: Rating, %impedance, No of taps

Nominal tap, present tap etc

6. Contact person phone number in case of any clarification regarding

data

7. Generator Data to be filled:

a. Round Rotor Generator Model:

Note:Xd, Xq, X’d, X’q, X"d, X"q, X1, H, and D are in pu on machine MVA base.

b. Salient Pole Generator Model:

Note: Xd, Xq, X’d, X"d, X"q, X1, H, and D are in pu on machine MVA base.

Xd- Direct Axis Positive phase Sequence Synchronous Reactance

Xq- Quadrature Axis Positive phase Sequence Synchronous Reactance

X’d- Direct Axis Transient Reactance(unsaturated)

X’q- Quadrature Axis Transient Reactance(unsaturated)

X’d- Direct Axis Sub-Transient Reactance(unsaturated)

X’q- Quadrature Axis Sub-Transient Reactance

T’do –Direct axis transient open circuit time constant (Secs)

T’qo –Quadraturet axis transient open circuit time constant (Secs)

T”do –Direct axis Subtransient open circuit time constant (Secs)

T”qo –Quadrature axis Subtransient open circuit time constant (Secs)

H- Inertia of complete turbogenerator(MWs/MVA)

s- saturation factor

B. Excitation system: Data for the type of excitation system in the generator along with block

diagram to be given. 2 Nos. Sample data/Block diagrams are given for IEEE type2

and simple model.

a. IEEE Type 2 Excitation System:

Note: for E1, SE(E1),E2, SE(E2) – Excitation curve i.e) Efd Vs If curve is required

b. Simple exciter model:

Set CSWITCH = 0 for bus fed. Set CSWITCH = 1 for solid fed.

Set CON (J+7) = 0 for exciter with negative field current capability.

Set CON (J+7) > 0 for exciter without negative field current capability. (Typical CON (J+7) = 10.)

C. Governor Data:

a. Hydro Turbine-Governor:

b. Steam Turbine-Governor:

Note: VMAX, VMIN, Dt are in per unit on generator base.

T2/T3 = high-pressure fraction.

T3 = reheater time constant.

c. Gas Turbine-Governor:

D. Power System Stabilizer Model(PSS):

E. HVDC Model:

a. DC Line Model:

b. DC Line auxiliary signal Model:

Deliberations in the First Meeting of Monitoring Committee held on 06.06.2012

1

Deliberations of 1st Meeting of Monitoring Committee held on 06.06.2012

in SRPC, Bangalore

1. Provision of bus bar protection at Ambewadi S/S:

KPTCL informed that R&M works contract for 220kV Ambewadi S/S had been

awarded to M/s Easun Reyrolle. Bus bar protection installation is part of R&M and

would be completed by December-2012.

2. Reversion to original set points for protection at Kaiga:

NPCIL confirmed that Zone-1 protection of 220 kV Kaiga- Kadra and 220 kV

Kaiga- Kodasalli lines at Kaiga end made 100% and Timing of Zone- 2 & 3 was

revised to 300 ms & 600 ms respectively. The Zone -1 would be made 80% and Zone

-2 &3 would also be revised after assessing performance during monsoon.

3. Shifting of 400kV lines at 400kV Guttur on to different buses with Bus coupler closing

was carried out on 29.04.2012. The arrangement of lines is as follows:

a. On Bus-1: Hiriyur-2, Narendra-1, Munirabad, Kaiga-1 and ICT-2.

b. On Bus-2: Hiriyur-1, Narendra-2, JSW, Kaiga -2 and ICT-1.

4. Provision of synchronizing facility at Kadra SS:

KPCL informed that ABB Executive had visited the site, however the report

was awaited. The status would be furnished in the next Protection Committee

meeting.

5. NPCIL agreed to send communication conveying nomination of single Nodal Officer

for coordination between Kaiga Stage -1 and Stage-2.

6. KPTCL informed that a few 400kV Guttur breakers were being overhauled and

replacement of 3 breakers is under progress. It would be completed by end of

December-2012.

7. KPTCL informed that for Nagjheri SPS extension, procurement of 2 nos. PLC license

(ABB) is under progress, and would be completed by end of June 2012.


2

8. KPTCL confirmed that all 220kV lines in Kali complex area are presently in closed

condition and care would be taken to avoid simultaneous LCs in future.

9. Kaiga Islanding scheme:

The proposed Kaiga islanding scheme was discussed in detail. It is proposed

to have a 220 kV and 400 kV island at Kaiga by tripping the ICTs at Kaiga.

The islanding schemes are as follows:

Island 12 (220kV Kaiga U1& 2 Island):

The island includes the following loads and Generation:

Load:

Sr.No. Substation Name Load MW

1 220kV Kaiga -

2 220kV Kadra -

3 220kV Kodasalli -

4 220kV Nagjheri -

5 220kV Bidnal 50

6 220kV Hubli 50

7 220kV Soundatti 50

8 220kV Mahalingapur 100

9 220kV Ambewadi 10

10 220kV Narendra-KPTCL 50

11 220kV Belgaum 100

12 220kV Chikkodi 100

13 220kv Karwar 50

14 220kV Ponda Draft-Minutes

of 1st meeting

of monitoring

committee

held on

06.doc90

15 220kV Kanabargi (220/110kV T/F

to be tripped)

-

16 220kV Indal 20

Total 670


3

Generation:

Sr.No. Generating station Generation in MW

1 Nagjheri 600

2 Kadra & Kodasalli 150


Total 1050

Accordingly LDC, KPTCL would advise Nagjheri Power house to set the toggle

to trip the appropriate no. of units at Nagjheri depending on the island’s load

generation balance. In case of non-availability of one of the 220kV lines from 220 kV

Kaiga, one of the units would need to go on house load. LD, KPTCL would arrange

for the same to be displayed in their SCADA for better visibility.

Island 34 (400kV Kaiga U 3& 4 Island):

The island includes following loads and Generation:

Load:

S.No. Substation Name Load MW

1 400 kV Kaiga -

2 400 kV Narendra -

3 220 KV Narendra-PG -

4 400kV Guttur -

5 220kV Davangere 150

6 220kV Ranibennur 50

7 220 kV MK Hubli 50

8 220 kV Ghataprabha 30

9 220 kV Haveri 60

Total 340

Generation:

S.No. Generating station Generation in MW


Total 300


4

During discussions, it was understood that auxiliaries of both the stages are being fed

from 220kV system. It was suggested to NPCIL to feed the auxiliaries of 220 kV

connected Units from 220 kV system and 400kV connected units from 400 kV

system. With this arrangement, the islanding would be smoother and have better

chances for survival.

10. SRLDC informed that preliminary studies regarding split bus at Narendra had been

conducted but had not yielded satisfactory results. KPTCL informed that Narendra

split bus operation was not required till December 2012. After December, split bus

operation can be studied depending up on the system requirements.

11. KPTCL informed that they had appraised their Management regarding the

strengthening of 220kV lines from Kaiga to Kadra, Kodasalli and also Nagjheri

evacuation by providing HTLS conductor.

12. KPTCL informed that HCL executive had visited the site and Hot line (VSAT) facility

between Kaiga 220 kV SS and SLDC, KPTCL would be reestablished by end of

June-2012.

13. It was agreed to conduct black start restoration Procedure Mock drill at Kadra and

Kodasalli and extend supply to dead bus at Kaiga along with KAPS auxiliaries in July

2012 during the shutdown of Unit -2. NPCIL would revert back regarding the quantum

of auxiliaries’ load that can be put during the Mock exercise.

14. NPCIL informed that single phase auto reclosing scheme may be implemented after

examining the experience at Narora.

15. Regarding Third party protection audit at Guttur, KPTCL informed that they may try

to add the same in the scope for Guttur R&M works. However they also said that

Third party protection audit may be required in substations of other utilities as well.

16. KPTCL informed that they would discuss the issue regarding non-availability of data

during grid disturbances with their SCADA department and revert back.

17. KPCL and NPCIL confirmed that the carrier protection on 220kV Kaiga- Kadra and

220kV Kaiga- Kodasalli lines would be implemented by end of June 2012.

18. KPTCL and NPCIL confirmed that the problem in PLCC between Kaiga and Guttur

had been attended and it was presently working.


5

The Committee appreciated the efforts of KPTCL and KGS in resolution of the issues

involved. The efforts of SRLDC in the evolution of the Kaiga Islanding Scheme etc

were also well appreciated.

***********

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