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~ 1fR UlfUT ~ : fft-9, ~ ~:&1~~}lI'1<:1~, cpcqlRlIl mro, ~ ~- 110016National Load Despatch Centre: 8-9, Qutab Institutional Area, Katwaria Sarai, New Delhi - 110016website: www.nldc.in, www.nldcindia.in,Tel.: 011-26536832, 011-26524522, Fax: 011-26524525, 011-26536901- .

Ref: POSOCO/NLDC/System Operation/Outage Planning/

To,

Member Secretary

NRPC/WRPC/SRPC/ERPC/NERPC

Dated: 28th February 2013

Subject: Draft Procedure for Transmission Elements Outage Planning

Sir,

Outage Coordination has been one of the important functions of Regional Power Committees (RPCs),

Regional Load Despatch Centres (RLDCs) and National Load Despatch Centre (NLDC) and it

constitutes the first stage of operational planning. Proper coordination of transmission element

outage is important for network reliability and security. The importance of outage coordination has

also been emphasised in the recommendations of the "Enquiry Committee on Grid Disturbance in

Northern Region on so" July 2012 and in Northern, Eastern and North Eastern Region on 31st July

2012" and the same is quoted below:

"9.6 Coordinated outage planning of transmission elements Outage planning of inter-State and inter-

regional transmission elements should be carried out in a coordinated manner at RPC fora (say

Operation Co-ordination sub-committee of RPCs) in accordance with regulation 5 of Central

Electricity Authority (Grid Standards) Regulation, 2010 and Section 5.7.1 of Indian Electricity Grid

Code. In case need for emergency maintenance arises in between two meeting of Operation Co-

ordination sub-committee, NLDC and RLDCsshould allow such maintenance after carefully looking at

prevailing system conditions under intimation to RPCSecretariat. "

Further it has been also been advised by Member (GO&D) vide letter dated oz" September 2012 to

carry out outage planning of inter-state and inter regional elements in coordination with RPCs.

In view of the above and based on the experience so far, a draft procedure for transmission

elements outage planning has been prepared and enclosed with this letter. It is proposed that the

procedure may be discussed in the forthcoming OCC meeting of each region. The procedure would

be finalised after suitably incorporating the comments received during these meetings.

With Regards,

Yours Sincerely

0\~ pV.K. Agrawal

ED,NLDC

POSOCO

Copy to:

Member (GO&D), CEA

Director(Operations), POWERGRID

CEO POSOCO

EDSRLDC

GM NRLDC, WRLDC, ERLDC,NERLDC

~ ~ ~ CfilllT('1ll: ~·9. ~ ~!{T"f(ij"" ~, Cficc:llf"{lll mP1, ~ ~-110016Registered & Corporate Office: 8-9, Qutab Institutional Area. Katwaria Sarai, New Delhi - 110016

http://www.nldc.in,

http://www.nldcindia.in,Tel.:

Procedure for Transmission Elements

Outage Planning

March 2013

The procedure aims to streamline the process of outage coordination between SLDCs, RLDCs, NLDC, RPCs and Indenting Agencies

1. Introduction

Reliable operation of the All India grid is important from the view point of

Quality Of Service (QoS) to the customers and other stakeholders. Proper co-

ordination of transmission outages in the system is one of the key aspects to

ensuring reliability. Outages in the transmission network could either be on

account of planned maintenance activities or construction related activities or

any emergency conditions arising in the field. Proper coordination of

transmission element outage is important mainly due to the following factors:

i. Reliability of operation of the All India grid

ii. Certainty to the electricity markets.

iii. Proper crew resource mobilization at the work sites to ensure that

outage time is minimized.

iv. Proper coordination of works by different entities to ensure that

outage time is optimised.

Outage Coordination has been one of the important functions of Regional

Power Committees (RPCs), Regional Load Despatch Centres (RLDCs) and

National Load Despatch Centre (NLDC) and is the first stage of operational

planning. As per Indian Electricity Grid Code (IEGC), the responsibility to

undertake planning of outage of transmission system has been assigned to

RPCs. The outages of the inter-state transmission lines and intra state elements

which are important for the region are being coordinated by RLDCs. In the

cases where the outages may have an impact across two or more regions,

coordination is in consultation with NLDC. The relevant clauses of IEGC in this

regard are quoted below:

“2.4.2 The following functions which go to facilitate the stability and smooth operation of the systems are identified for the RPC:

………… (e) To undertake planning of outage of transmission system on annual /

monthly basis.”

“2.3 Role of RLDC

2.3.1.1The Regional Load Despatch Centre shall be the apex body to ensure integrated operation of the power system in the concerned region” “2.2 Role of NLDC …….. (f) Coordination with Regional Power Committees for regional outage schedule in the national perspective to ensure optimal utilization of power resources.” 2. Objective

At present, planned outages are being discussed in respective Operation

Coordination Committee (OCC) meeting of RPCs and availed based on the

actual grid conditions and/or any changes requested by transmission system

owner or transmission element outage indenting agency. The approval of

planned as well as emergency outages in the transmission network level in real

time is being coordinated by RLDCs and NLDC based on system conditions. The

procedure aims to streamline the process of outage coordination between

SLDCs, RLDCs, NLDC, RPCs, owners of transmission assets and transmission

element outage Indenting Agencies. As outage planning is an important part of

operational planning, multi-layered checks would help in ensuring reliability of

the power system. These checks need to be at the following levels:

Due diligence between the agencies involved in the transmission asset

maintenance through bilateral discussion.

Study sub-committee of RPCs.

Operation Co-ordination sub-Committee of RPCs

Off-line simulations and planning at RLDCs/NLDC level

Real time check at RLDCs/NLDC level

3. Scope

The procedure is applicable to RPCs, RLDCs, NLDC, SLDCs, STUs, load serving

entities and indenting agency. It would be applicable once the annual outage

plan is finalized by 31st December of each year for the next financial year by

the RPCs as per the IEGC.

4. Procedure for discussing outages in OCC meeting.

4.1. Indenting Agency: The agency which gives the requisition for outage

of any transmission element shall be called Indenting Agency. Any of

the following may request for outage of any transmission elements:

4.1.1. Transmission Licensees / State Transmission Utilities

4.1.2. Generating Companies

4.2. Indenting Agency shall submit the proposed shutdown for the next

calendar month latest by 3rd day of the current month to the RPC

Secretariat as per Format IA / Format IB.

4.3. In case of shutdown of inter-regional lines and intra-regional lines

affecting the transfer capability of any inter regional corridor, the

Indenting agency shall submit the shutdown proposal in both the

concerned RPCs. To facilitate this broad list of such lines is indicated

at Annexure II which will be reviewed and updated by NLDC from

time to time. The indenting agency may do an internal screening of

its outage plan centrally to avoid multiple outages in the same

corridor simultaneously. Bilateral discussion between the agencies

involved may also be done to minimize outage duration before

submitting the outage plan to RPCs.

4.4. RPC Secretariat shall compile all the received proposals and put up

the same on its website by 5th day of the month as per Format IIA /

Format IIB.

4.5. System Study sub-committee of RPCs shall study the impact of these

outages and based on its recommendations, RPC shall discuss

proposed outages in the OCC meeting and prepare a list of approved

transmission outages with the precautions to be taken. RPCs would

attempt to schedule all their OCC meetings between 10th to 15th day

of the month so that sufficient time is available both to the Study

Committee before the OCC meetings as well as for RLDCs/NLDC

(mainly to take care of further changes in the network topology

and/or in load generation) after the OCC meeting.

4.6. While approving the shutdowns it shall be ensured that outages in

the same corridor shall not be approved simultaneously. It also need

to be ensured that all other concerned entities should also complete

their work during the shutdown period so as multiple shutdown of

same element for work by multiple agencies are avoided. The

multiple outages of the transmission element for the same work

during the year may also be avoided.

4.7. RPC shall send the list of approved transmission outages to

SLDCs/RLDCs/NLDC within 3 days of the OCC meeting and preferably

latest by 18th of the month as per Format IIIA / Format IIIB. The same

shall also be displayed on RPC websites.

4.8. Any shutdown proposal which requires approval of two RPCs shall be

considered approved only if it is approved in both the RPCs.

4.9. After the receipt of Format IIIA / Format IIIB from each RPC, NLDC in

consultation with RLDCs may prepare a tentative readjusted

timings/dates of transmission element outages for next month

considering the principles set out in this procedure.

5. Approving Load Despatch Centre and Consenting Load Despatch Centre

5.1. Approving Load Despatch Centre: The Load Despatch Centre

responsible for approving any transmission outage shall be called

Approving Load Despatch Centre.

5.2. Consenting Load Despatch Centre: The agency whose consent is

required by Approving Load Despatch Centre for approving any

outage shall be called Consenting Load Despatch Centre .Once the

RPCs approve the monthly outage plan, the responsibility of approval

of outages shall be as under:

Sl.No Type of Outage Consenting Load Despatch Centre

Approving Load Despatch Centre

1 765 kV or above Lines Concerned RLDCs

NLDC

2 Inter-Regional Lines Concerned RLDCs

NLDC

3 HVDCs Concerned RLDCs

NLDC

4 International Interconnections

Concerned RLDC NLDC

5 Intra-Regional Lines affecting transfer capability of any inter regional corridor.

Concerned RLDCs

NLDC

6 Intra-Regional Lines which does not affect transfer capability of any inter regional corridor and included in the list of important elements of RLDCs (excluding lines covered under sl no.1,3,4 and 5)

SLDCs RLDCs

7 All other lines (excluding sl no. 1,2,3,4,5,6)

SLDC SLDC

6. Procedure for approval of outage on D-3 basis

6.1. Planned Outages which have been approved in the OCC meeting of a

region shall be considered for approval by RLDCs/NLDC on D-3 basis.

If an outage is to be availed on say 10th of the month, the indenting

agency would forward such requests to the concerned RLDC on 7th of

the month by 1000 hours. This practice is necessary to realize the

seriousness and readiness of the agency which indented the outage

request in the first place as it is observed that many outages are not

availed as per the monthly schedule. In case the request for

transmission element outage is not received within the timeline

prescribed above, it will be assumed that the indenting agency is not

availing the outage.

6.2. Request for outages which are approved by OCC must be sent by the

owner of the transmission asset at least 3 days in advance to

respective RLDC by 1000 hours as per Format IV.

6.3. In case the owner is not availing the OCC approved outage, the same

shall be intimated to the respective RLDC at least 3 days in advance.

6.4. Planned Outages which are approved in OCC meeting shall only be

considered for approval on D-3 basis.

6.5. Approval of Outage where Approving Authority is NLDC

6.5.1. RLDCs shall forward the request for shutdown along with their

consent and observation as per Format V to NLDC/other concerned

RLDCs with clear observations regarding possible constraints /

contingency plan and consent including study results by 1000 hours

of D-2 day. Other concerned RLDCs would forward their

observations/consent/reservations by 1600 hours of D-2.

6.5.2. NLDC shall approve the outage along with the clear

precautions/measures to be observed during the shutdown and

inform all concerned RLDCs.

6.5.3. The proposed outages shall be reviewed on day ahead basis

depending upon the system conditions and the outages shall be

approved/refused latest by 1200 Hrs of D-1 day. A suggestive format

for approval of outage is enclosed as Format VI.

6.5.4. In case the outage is approved precautions/measures to be

observed during the shutdown shall be stated. In case of refusal,

clear reasons shall be stated by the RLDCs/NLDC.

6.5.5. Outages impacting the transfer capability of more than one

corridor shall not be allowed simultaneously.

Sl No Activity Day Time

1 Request of shutdown from Indenting agency to concerned RLDC.

D-3 1000 hrs

2 Forwarding request of shutdown requiring NLDC approval from RLDC to other concerned RLDCs and NLDC (along with the recommendations and study result)

D-2 1000 hrs

3 Comments of other RLDCs or NLDC

D-2 1800 hrs

4 Approval or Rejection of Request

D-1 1200 hrs

6.6. Approval of Outage where Approving Authority is RLDC

6.6.1. In case the indenting agency is a state entity, the request for

transmission element outage shall be submitted to respective state

load despatch centre (SLDC). SLDC shall forward the request for

shutdown along with their consent and observation as per Format V

to RLDC.

6.6.2. In all other cases, the request for transmission element outage

shall be submitted to respective RLDC.

6.6.3. RLDC shall study the impact of proposed outages and approve /

refuse the outage latest by 1200 Hrs of D-1 day. A copy of the

approval / refusal shall also be sent to NLDC (for 400 kV and above

lines). A suggestive format for approval / refusal of outage is

enclosed as Format VI.

6.6.4. In case the outage is approved precautions/measures to be

observed during the shutdown shall be stated. In case of refusal,

clear reasons shall be stated by the SLDCs/RLDC

6.6.5. Outages in the same corridor shall not be approved

simultaneously shall be rescheduled accordingly.

6.7. Approval of Outage where Approving Authority is SLDC

6.7.1. SLDC shall study the impact of proposed outages on the system

and approve the outage latest by 1200 Hrs of D-1 day. The format VI

as suggested above can be used for approval / refusal of outage.

6.7.2. Outages in the same corridor shall not be approved

simultaneously and shall be rescheduled accordingly.

6.8. In case of any system constraint or any other reason, approving

authority may decline the proposed outage by giving the reasons for

the same and tentative dates for the shutdown.

6.9. In case, any approved outage is not availed in real time, the same

may not be allowed again in that month. In such a scenario,

indenting agency shall be required to submit a fresh proposal in the

next OCC meeting.

6.10. A list of all approved outages for the next day must be available in

the RLDCs/NLDC control room by 1900 hours with a copy of the

study results and special precautions, if any. This would be studied

by the night shift engineers so that the outage can be facilitated the

next day morning.

7. Approval of Emergency Outages

7.1. All outages which are not approved in the OCC meeting but having

impact on human and equipment safety and/or to meet any other

emergency requirement or special conditions shall be considered

under Emergency Outage category.

7.2. The request for emergency outage shall be submitted along with the

details like nature of emergency, impacts due to emergency

situation, reasons and associated facts for not considering in the

outage planning process.

7.3. Emergency outages shall be allowed subject to system conditions

and its severity. In this case, if required, planned outage may be

deferred, if possible.

7.4. Emergency outages shall be allowed immediately or within the short

possible time, based on the severity of the emergency and system

condition on instance to instance basis.

8. Availing Outages in real time

8.1. The agencies involved shall ensure availing of outages as per the

approved schedule time.

8.2. On the day of outage, the outage availing agency shall seek the code

for availing outage from respective RLDC(s) /NLDC (wherever

applicable). The agencies involved shall endeavour to avail the

outage with in 15mintues of availing the code but not later than 30

minutes. In case, due to any contingency, the outage could not be

availed within 30 minutes, a fresh code needs to be obtained by all

concerned agencies stating the reason there of Record of scheduled

and actual time of outage and restoration shall be maintained at

RLDCs/NLDC.

8.3. RLDCs shall prepare a monthly statement of scheduled and actual

time of outage and restoration and forward the same to RPC latest

by 05th day of the next month with a copy to NLDC. The format is

enclosed as Format VIIA / Format VIIB.

8.4. SLDCs shall prepare a monthly statement of scheduled and actual

time of outage and restoration and forward the same to RPC latest

by 05th day of the next month with a copy to concerned RLDC. The

Format VIIA / Format VIIB as suggested above can be used for

sending the report to RPCs.

8.5. RLDCs/NLDC shall develop a separate web based portal for

information exchange subsequently, which would dispense with the

need for emails.

8.6. As any deviation in the outage from the schedule can affect other

planned outages as well as affect reliability and electricity markets,

indenting agency must strictly adhere to the shutdown timings.

9. Normalisation of Outages

9.1. All effort shall be made by the Indenting agency to normalise the

shut down within approved time period so that the transmission

element is normalised within the approved time period.

9.2. On completion of the outage work, the outage availing agency shall

seek the code for normalisation of elements from respective RLDC(s).

The agencies involved shall endeavour to normalise the outage with

in 15mintues of availing the code but not later than 30minutes. In

case, due to any contingency, the normalisation could not be done

with in 30minutes, a fresh code needs to be obtained by all

concerned agencies stating the reason thereof.

9.3. In case of extension of a shutdown, the Indenting agency would

furnish the reasons of extension, and expected normalisation time to

concerned RLDC/SLDC at least one hour before the scheduled

normalisation time.

9.4. Under such circumstances SLDCs/RLDCs/NLDC shall review the

impact of such delay on the shutdown already approved

transmission system and would reserve the right to review for

according/cancellation of the shutdown.

9.5. In case of repeated delay in normalisation of outages by any agency,

the same shall be reported by SLDCs/RLDCs/NLDC to RPCs.

10. Request for charging new elements

10.1. Owner of the transmission asset shall submit the request for

probable charging new elements for the next calendar month latest

by 3rd day of the current month to the RPC Secretariat.

10.2. System Study sub-committee of RPCs shall study the impact of

charging of new elements and based on its recommendations, RPC

shall discuss the requests for charging new elements in the OCC

meeting and prepare a list of new elements to be charged during the

next calendar month along with the precautions to be taken. RPC

shall send the list of new elements to be charged within 3 days of the

OCC meeting and latest by 18th of the month. The same shall also be

displayed on RPC websites.

10.3. The owner of the new transmission element shall inform the

concerned SLDC / RLDC / NLDC about the charging of the element

atleast 3 days in advance.

10.4. SLDCs / RLDCs / NLDC shall study the charging of all 400 kV and

above new elements and prepare charging instructions which shall

be forwarded to the asset owner along with the study results with a

copy to NLDC.

List of Annexures

Sl No. Format /

Annexure No

Title From

(Agency)

To

(Agency)

1 Annexure I Flow Chart of Transmission Outage Planning

2 Annexure II Important Elements of NLDC

List of Formats

1 Format IA Request For Transmission

Element Outage

Indenting

Agency

RPC

2 Format IB Request For Bus, Bay, ICTs,

Reactor, FACTS, FSCs, SVCs

etc Outage

Indenting

Agency

RPC

3 Format IIA List of monthly proposed

shutdowns of Transmission

Lines

RPC Website

4 Format IIB List of monthly proposed

shutdowns of Bus, Bay,

ICTs, Reactor, FACTS, FSCs,

SVCs etc

RPC Website

5 Format IIIA List of monthly approved

shutdowns of Transmission

Lines

RPC NLDC/RLDC/SLDC

6 Format IIIB List of monthly approved

shutdowns of Bus, Bay,

ICTs, Reactor, FACTS, FSCs,

SVCs etc

RPC NLDC/RLDC/SLDC

7 Format IV Request for Transmission

Element Outage

Indenting

Agency

RLDC/SLDC

8 Format V Request for Transmission Element Outage

RLDC NLDC

9 Format VI Approval of Outage RLDC / NLDC

Indenting Agency/RLDC

10 Format VIIA Monthly Shutdown Report

For Transmission Lines

SLDC/RLDC RPC

11 Format VIIB Monthly Shutdown Report

For For Bus, Bay, ICTs,

Reactor, FACTS, FSCs, SVCs

etc

SLDC/RLDC RPC

LINK Voltage Level Inter Regional Lines OWNER No. of Circuit

HVDC Link Vindhyachal Back to Back (500 MW) PG -

Agra-Gwalior I ( 765kV operated at 400kV) PG Single Circuit

Agra-Gwalior II ( 765kV operated at 400kV) PG Single Circuit

Kankroli-Zerda PG Single Circuit

Bhinmal-Zerda PG Single Circuit

Kota-Badod RAJ-MP Single Circuit

Morak-Badod RAJ-MP Single Circuit

Auraiya-Mehgaon MP-MP Single Circuit

Auraiya-Malanpur MP-MP Single Circuit

Neemuch-Udaipur MP-RAJ Single Circuit

Seopar Kalan-Sawai Madhopur MP-RAJ Single Circuit

Ranapratap Sagar-Gandhi Sagar RAJ-MP Double Circuit

Rihand-Morwa UP-MP Single Circuit

Rajghat-Lalitpur MP-UP Single Circuit

HVDC Link Bhadravati Back to Back (2x500 MW) PG -

Chikkodi- Kolhaphur KAR-MAH Double Circuit

Ambewadi-Ponda KAR-GOA Single Circuit

Ambewadi-Xeldem KAR-GOA Single Circuit

Rourkela-Raigarh PG Circuit III & I

Raigarh-Sterlite PG Circuit II & IV

Ranchi-Sipat PG Double Circuit

Budhipadar-Raigarh OD-CH Single Circuit

Budhipadar-Korba(East) OD-CH Circuit II

Budhipadar-Korba(East) PG Circuit III

Sasaram Back to Back (500 MW) PG

Sasaram-Saranath (400KV) PG Single Circuit

Sasaram-Allahabad (400KV) PG Single Circuit

765KV Gaya-Sasaram-Fatehpur PG Single Circuit

Muzaffarpur-Gorakhpur PG Double Circuit

Patna-Balia PG Four Circuits

Biharshariff-Balia PG Double Circuit

Sasaram-Balia PG Single Circuit

220KV Pusauli-Sahupuri BR-UP Single Circuit

Sone nagar-Rihand BR-UP Single Circuit

Garwah-Rihand BR-UP Single Circuit

Karmanasa-Sahupuri BR-UP Single Circuit

Karmanasa-Chandauli BR-UP Single Circuit

400 KV Jeypore-Gazuwaka Back to Back PG Double Circuit

HVDC Link Talcher-Kolar Bipole PG -

400KV Binaguri-Bongaigaon PG Double Circuit

220KV Birpara-Salakati PG Double Circuit

NR-Nepal 132 KV Tanakpur-Mahendernagar UK-NEP Single Circuit

132 KV Salakati - Geylegphug PG Single Circuit

132 KV Rangia -Matonga AS-BHU Single Circuit

400KV Binaguri -Tala-I & II ( India portion) PG Double Circuit

400KV Binaguri -Tala- IV ( India portion) PG Single Circuit

400KV Binaguri -Malbase - III ( India portion) PG Single Circuit

220KV Birpara - Chukha - I & II ( India portion) PG Double Circuit

220KV Birpara - Malbase ( India portion) PG Single Circuit

220kVWR-SR

ER-BHUTAN

220KV

ER-NER

400KV

132KV

NER-BHUTAN

ER-SR

TRANS NATIONAL LINK

HVDC Link

ER-NR

INTER REGIONAL LINK

Annexure II

WR-NR 220KV

132KV

400KV

IMPORTANT GRID ELEMENTS

REGION Voltage Level Inter Connection OWNER No. of Circuit

NR +/- 500KV HVDC RIHAND-DADRI BIPOLE PG -

NR +/- 500KV HVDC BALIA-BHIWADI BIPOLE PG -

WR/NR +/- 500KV HVDC MUNDRA-MOHINDERGARH- BIPOLE * APL -

WR +/- 500KV HVDC CHANDRAPUR-PADGE BIPOLE MSETCL -

765KV ANPARA C-UNNAO UPPCL SINGLE

765KV BALIA-LUCKNOW PG SINGLE

765 KV FATEHPUR-AGRA PG SINGLE

765KV MOGA-BHIWANI(PG) PG SINGLE

765KV JHATIKARA-BHIWANI PG SINGLE

765KV SIPAT-BILASPUR 1 PG SINGLE


765KV SEONI-BILASPUR 1 PG SINGLE


765KV SEONI-WARDHA 1 PG SINGLE


765KV BINA-SATNA 1 PG SINGLE


765KV SEONI-BINA PG SINGLE

* A dedicated transmission system set up by M/s Adani Power Ltd.

HVDC AND 765KV LINES ( EXCLUDING INTER REGIONAL LINKS)IMPORTANT GRID ELEMENTS

NR

WR

1 KANKROLI RAPP - C- I & II 400 WR-NR

2 SINGRAULI STPS HVDC VINDHYACHAL 400 WR-NR

3 SINGRAULI STPS ANPARA 400 WR-NR

4 Bhiwani PG Mohindergarh D/C 400 WR-NR

1 Bina Gwalior I & II 400 WR-NR

2 Bina Shujalpur I & II 400 WR-NR

3 Raipur Bhadravati I 400 WR-SR, W3

4 Raipur Bhadravati II & III 400 WR-SR,W3

5 Bhadravati Bhilai 400 WR-SR,W3

6 Bhilai Koradi 400 W3

7 Seoni Bhilai 400 W3

8 Korba Vindhyachal 400 W3

9 Korba Mahan 400 W3

10 Soja Zerda 400 WR-NR

11 Ranchodpura Zerda 400 WR-NR

12 Mundra Sami 400 WR-NR

13 Raipur Wardha I & II 400 W3

14 Wardha Akola I & II 400 W3

1 RAMAGUNDAM BHADRAVATI I & II 400 WR-SR

2 RAMAGUNDAM N'SAGAR I & II 400 WR-SR

3 JEYPORE GAZUWAKA I & II 400 ER-SR

4 Vijayawada Nellore I & II 400 ER-SR

1 PURNEA MUZAFFARPUR 400 ER-NER &ER-NR

2 BIHARSHARIFF SASARAM - I & II 400 ER-NR

3 BIHARSHARIFF SASARAM - III 400 ER-NR

4 MALDA PURNEA I & II 400 ER-NER &ER-NR

5 Kahalgaon Banka I &II 400 ER-NER &ER-NR

6 Banka Biharshariff I & II 400 ER-NER &ER-NR

7 Kahalgaon Biharshariff I & II 400 ER-NER &ER-NR

8 TALCHER GMR 400 ER-SR

9 GMR MERAMUNDALI I & II 400 ER-SR

10 TALCHER ROURKELA I & II 400 ER-SR

11 KHARAGPUR KOLAGHAT 400 ER-SR

12 KOLAGHAT BARIPADA 400 ER-SR

13 FARAKKA MALDA 400 ER-NER &ER-NR

14 MAITHON KAHALGAON I & II 400 ER-NR

15 JEYPORE INDRAVATI 400 ER-SR

16 JEYPORE BOLANGIR 400 ER-SR

17 BOLANGIR MERAMUNDALI 400 ER-SR

18 Kahalgaon Barh I & II 400 ER-NR

19 Sterlite ROURKELA (LILO) II & IV 400 W3-ER

19 Rengali Keonjhar 400 ER-SR

20 Keonjhar Baripada 400 ER-SR

1 Balipara Bongaigaon I & II 400 ER-NER

2 Bongaigaon TPS (BTPS) Salakati I & II 220 ER-NER

3 Agia Sarusajai I & II 220 ER-NER

4 Balipara Samaguri 220 ER-NER

TTC / ATC impact

NORTH EASTERN REGIONSL NO FROM TO VOLTAGE

KV

SOUTHERN REGION

SL NO FROM TO VOLTAGE KV TTC / ATC impact

TTC / ATC impact

EASTERN REGIONTO VOLTAGE

KVSL NO FROM


NORTHERN REGIONSL NO FROM TO VOLTAGE

KV TTC / ATC impact

IMPORTANT LINES HAVING IMPACT ON TTC/ATC

WESTERN REGIONTTC / ATC impactSL NO FROM TO VOLTAGE

KV

Annexure I

Flow Chart: Transmission Elements Outage Planning

Inputs Activity Timelines

START

Preparation of Annual

Outage Plan by RPCs

Preparation of list of

proposed outages for next

calendar month by RPCs

Monthly review of

outage plan for next

calendar month

Finalization of outages for

next calendar month in the

OCC meeting

RPC shall display the annual

outage plan on their website by

31st December each year for the

next financial year

5th day of a month

In the OCC meeting

Latest by 15th of every

month for the next

month

Latest by last day of every

month

RPC to send list of

approved outages to

SLDCs/RLDCs/NLDC

Within 3 days of the OCC

meeting and preferably

latest by 18th of the

month

Recommendations of

Study Sub Committee

of RPCs to the OCC

Moderation of Outages

by NLDC in consultation

with RLDCs

Future Outage

plan of all

entities

Outage requests from

indenting agency to

RPCs by 3rd day of

current month

Submission to

RPC by 31st Oct

every year

Requisition for outage by

requesting agency to

RLDC/SLDC

Approval /

Refusal of

outage by

NLDC

Approval /

Refusal of outage

by RLDC/SLDC

NLDC

RLDC to forward

outage request

to NLDC along

with comments

Approving

Authority

RLDC to study the

impact of Outage on

IR Corridor

RLDC / SLDC

Latest by 1200 Hrs of D-1

day


day where D is the day of

outage


day

Monthly statement of

approved shutdowns by

RLDCs/SLDCs to RPCs

Latest by 5th day of next

month for the previous

month

STOP

Execution and

Normalisation of Outage As per approved timings and

Subject to real time

conditions. In case the

shutdown is required to be

postponed, revised dates

would be suggested

SLDC to study the

impact of Outage and

gives its comments

Comments

from other

RLDCs NO YES

Date

Sl.No.

Name of the Requesting Agency

Voltage Level (kV)

From Substation

To Substation Owner Ckt ID

Inter Regional / Intra Regional

Daily/ Continous Reason

From Date

From Time

To Date

To Time Remarks

Format I(A): Request For Transmission Element Outage by Indenting agency to RPC

Line Details Proposed Date and TimeFor the MonthIndenting Agency

For the Month Date

Sl.No.


Voltage Level (kV) Owner



From Date

From Time

To Date

To Time RemarksName of the Element

Line Details Proposed Date and Time

Format I(B): Request For Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc Outage by Indenting agency to RPC

Indenting Agency

Date

Sl.No.


Voltage Level (kV)

From Substation




From Date

From Time

To Date

To Time Remarks


Format II(A): List of Received Proposals for Transmission Element Outage from Different Agencies

Name of the RPC For the Month

For the Month Date

Sl.No.





From Date

From Time

To Date


Format II(B): List of Received Proposals for Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc Outage from Different Agencies

Name of the RPCLine Details Proposed Date and Time

For the Month Issue Date

Sl.No.


Voltage Level (kV)

From Substation




From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

Control Area/ Corridor impacted Remarks

Format III(A): List of OCC approved shutdowns of Transmission Lines

Line Details Approved Date and TimeProposed Date and TimeName of the RPC


Sl.No.


Voltage Level (kV) Owner Ckt ID



From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time


Format III(B): List of OCC approved shutdowns of Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc

Approved Date and TimeName of the RPC

Name of the Element

Line Details Approved Date and Time

Format IV: Request for Transmission Element Outage by

Indenting Agency to RLDC/SLDC

Name of the Requesting Agency: Address of the Requesting Agency:

Name of the element :

Voltage Level : Owner : OCC Approved (Yes/No) : OCC Reference No. : Duration of Outage : From Date- To Date- From Time- To Time- Daily/Continuous : Reason for Outage : Approving Authority :

( ) Signature

Place: Date: Time:

Format V: Request for Transmission Element Outage by

RLDC to NLDC Name of the Requesting Agency: Name of the element :

Voltage Level (kV) : 765/400/220/230/132 Owner : OCC Approved : Yes/No OCC Reference No. : Duration of Outage : From Date- To Date- From Time- To Time- Type : Daily / Continous Reason for Outage : Consent : Yes / No Study Conducted : Yes / No Results of Study Attached: Yes / No Revision in TTC Required: Yes/No If Yes,

Conditions:

( )

Signature Place: Date: Time:

Sl.No. Corridor Original TTC Revised TTC Limiting Constraint

Format VI: Approval /Refusal of Outage by

NLDC/RLDCs/SLDCs

___________Load Despatch Centre

<Address>

<Tel No.> <Fax No.>

Approval / Refusal for Shutdown

Approval / Refusal No: Date: Time:

From: To:

Sl No

Element Start End S/D Type*

Reason

Date Time Date Time

* C: Continuous Basis, D: Daily Basis

Remarks

<Precautions/measures to be observed during the shutdown> / <Reasons for

Refusal>

Signature

Copy to:

1.

2.

3.

Sl.No.Reuesting Agency

Approving Authority

Approval Number

Voltage Level (kV)

From Substation



Planned / Emergency


From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time Revision in TTC Remarks

Format VII(A): Monthly Shutdown Report For Transmission Lines by RLDCs/SLDCs

Approval Details Line Details Outage Details Scheduled Date and Time Actual Date and TimeDate and Time requested

by Indenting Agency

Name of the RLDC/SLDC For the Month Issue Date

OCC Approved Date and Time


Approving Authority

Approval Number



Planned / Emergency


From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date


Format VII(B): Monthly Shutdown Report For For Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc by SLDCs/RLDCsName of the RLDC/SLDC For the Month Issue Date

Actual Date and TimeOCC Approved Date and Time

Name of the element

Approval Details Line Details Outage Details Scheduled Date and TimeDate and Time requested by

Indenting Agency

~ 1fR UlfUT ~ : fft-9, ~ ~:&1~~}lI'1<:1~, cpcqlRlIl mro, ~ ~- 110016National Load Despatch Centre: 8-9, Qutab Institutional Area, Katwaria Sarai, New Delhi - 110016website: www.nldc.in, www.nldcindia.in,Tel.: 011-26536832, 011-26524522, Fax: 011-26524525, 011-26536901- .

Ref: POSOCO/NLDC/System Operation/Outage Planning/

To,

Member Secretary

NRPC/WRPC/SRPC/ERPC/NERPC

Dated: 28th February 2013

Subject: Draft Procedure for Transmission Elements Outage Planning

Sir,

Outage Coordination has been one of the important functions of Regional Power Committees (RPCs),

Regional Load Despatch Centres (RLDCs) and National Load Despatch Centre (NLDC) and it

constitutes the first stage of operational planning. Proper coordination of transmission element

outage is important for network reliability and security. The importance of outage coordination has

also been emphasised in the recommendations of the "Enquiry Committee on Grid Disturbance in

Northern Region on so" July 2012 and in Northern, Eastern and North Eastern Region on 31st July

2012" and the same is quoted below:

"9.6 Coordinated outage planning of transmission elements Outage planning of inter-State and inter-

regional transmission elements should be carried out in a coordinated manner at RPC fora (say

Operation Co-ordination sub-committee of RPCs) in accordance with regulation 5 of Central

Electricity Authority (Grid Standards) Regulation, 2010 and Section 5.7.1 of Indian Electricity Grid

Code. In case need for emergency maintenance arises in between two meeting of Operation Co-

ordination sub-committee, NLDC and RLDCsshould allow such maintenance after carefully looking at

prevailing system conditions under intimation to RPCSecretariat. "

Further it has been also been advised by Member (GO&D) vide letter dated oz" September 2012 to

carry out outage planning of inter-state and inter regional elements in coordination with RPCs.

In view of the above and based on the experience so far, a draft procedure for transmission

elements outage planning has been prepared and enclosed with this letter. It is proposed that the

procedure may be discussed in the forthcoming OCC meeting of each region. The procedure would

be finalised after suitably incorporating the comments received during these meetings.

With Regards,

Yours Sincerely

0\~ pV.K. Agrawal

ED,NLDC

POSOCO

Copy to:

Member (GO&D), CEA

Director(Operations), POWERGRID

CEO POSOCO

EDSRLDC

GM NRLDC, WRLDC, ERLDC,NERLDC

~ ~ ~ CfilllT('1ll: ~·9. ~ ~!{T"f(ij"" ~, Cficc:llf"{lll mP1, ~ ~-110016Registered & Corporate Office: 8-9, Qutab Institutional Area. Katwaria Sarai, New Delhi - 110016

http://www.nldc.in,

http://www.nldcindia.in,Tel.:

Procedure for Transmission Elements Outage Planning

March 2013

The procedure aims to streamline the process of outage coordination between RLDCs, NLDC, RPCs and Indenting Agencies

1. Introduction

Reliable operation of the All India grid is important from the view point of Quality Of Service (QoS) to the customers and other stakeholders. Proper co‐ordination of transmission outages in the system is one of the key aspects to ensuring reliability. Outages in the transmission network could either be on account of planned maintenance activities or construction related activities or any emergency conditions arising in the field. Proper coordination of transmission element outage is important mainly due to the following factors:

i. Reliability of operation of the All India grid

ii. Certainty to the electricity markets.

iii. Proper crew resource mobilization at the work sites to ensure that outage time is minimized.

iv. Proper coordination of works by different entities to ensure that outage time is optimised.

Outage Coordination has been one of the important functions of Regional Power Committees (RPCs), Regional Load Despatch Centres (RLDCs) and National Load Despatch Centre (NLDC) and is the first stage of operational planning. As per Indian Electricity Grid Code (IEGC), the responsibility to undertake planning of outage of transmission system has been assigned to RPCs. The outages of the inter‐state transmission lines and intra state elements which are important for the region are being coordinated by RLDCs. In the cases where the outages may have an impact across two or more regions, coordination is in consultation with NLDC. The relevant clauses of IEGC in this regard are quoted below:

“2.4.2 The following functions which go to facilitate the stability and smooth operation of the systems are identified for the RPC:

………… (e) To undertake planning of outage of transmission system on annual / monthly basis.”

“2.3 Role of RLDC

2.3.1.1The Regional Load Despatch Centre shall be the apex body to ensure integrated operation of the power system in the concerned region” “2.2 Role of NLDC …….. (f) Coordination with Regional Power Committees for regional outage schedule in the national perspective to ensure optimal utilization of power resources.” 2. Objective

At present, planned outages are being discussed in respective Operation Coordination Committee (OCC) meeting of RPCs and availed based on the actual grid conditions and/or any changes requested by transmission system owner or transmission element outage indenting agency. The approval of planned as well as emergency outages in the transmission network level in real time is being coordinated by RLDCs and NLDC based on system conditions. The procedure aims to streamline the process of outage coordination between RLDCs, NLDC, RPCs, owners of transmission assets and transmission element outage Indenting Agencies. As outage planning is an important part of operational planning, multi‐layered checks would help in ensuring reliability of the power system. These checks need to be at the following levels:

• Due diligence between the agencies involved in the transmission asset maintenance through bilateral discussion.

• Study sub‐committee of RPCs.

• Operation Co‐ordination sub‐Committee of RPCs

• Off‐line simulations and planning at RLDCs/NLDC level

• Real time check at RLDCs/NLDC level

3. Scope

The procedure is applicable to RPCs, RLDCs, NLDC, SLDCs, STUs, load serving entities and indenting agency. It would be applicable once the annual outage

plan is finalized by 31st December of each year for the next financial year by the RPCs as per the IEGC.

4. Procedure for discussing outages in OCC meeting.

4.1. Indenting Agency: The agency which gives the requisition for outage of any transmission element shall be called Indenting Agency. Any of the following may request for outage of any transmission elements:

4.1.1. Transmission Licensees / State Transmission Utilities

4.1.2. Generating Companies

4.2. Indenting Agency shall submit the proposed shutdown for the next calendar month latest by 3rd day of the current month to the RPC Secretariat as per Format IA / Format IB.

4.3. In case of shutdown of inter‐regional lines and intra‐regional lines affecting the transfer capability of any inter regional corridor, the Indenting agency shall submit the shutdown proposal in both the concerned RPCs. To facilitate this broad list of such lines is indicated at Annexure II which will be reviewed and updated by NLDC from time to time. The indenting agency may do an internal screening of its outage plan centrally to avoid multiple outages in the same corridor simultaneously. Bilateral discussion between the agencies involved may also be done to minimize outage duration before submitting the outage plan to RPCs.

4.4. RPC Secretariat shall compile all the received proposals and put up the same on its website by 5th day of the month as per Format IIA / Format IIB.

4.5. System Study sub‐committee of RPCs shall study the impact of these outages and based on its recommendations, RPC shall discuss proposed outages in the OCC meeting and prepare a list of approved transmission outages with the precautions to be taken. RPCs would attempt to schedule all their OCC meetings between 10th to 15th day of the month so that sufficient time is available both to the Study Committee before the OCC meetings as well as for RLDCs/NLDC

(mainly to take care of further changes in the network topology and/or in load generation) after the OCC meeting.

4.6. While approving the shutdowns it shall be ensured that outages in the same corridor shall not be approved simultaneously. It also need to be ensured that all other concerned entities should also complete their work during the shutdown period so as multiple shutdown of same element for work by multiple agencies are avoided. The multiple outages of the transmission element for the same work during the year may also be avoided.

4.7. RPC shall send the list of approved transmission outages to SLDCs/RLDCs/NLDC within 3 days of the OCC meeting and preferably latest by 18th of the month as per Format IIIA / Format IIIB. The same shall also be displayed on RPC websites.

4.8. Any shutdown proposal which requires approval of two RPCs shall be considered approved only if it is approved in both the RPCs.

4.9. After the receipt of Format IIIA / Format IIIB from each RPC, NLDC in consultation with RLDCs may prepare a tentative readjusted timings/dates of transmission element outages for next month considering the principles set out in this procedure.

5. Approving Load Despatch Centre and Consenting Load Despatch Centre

5.1. Approving Load Despatch Centre: The Load Despatch Centre responsible for approving any transmission outage shall be called Approving Load Despatch Centre.

5.2. Consenting Load Despatch Centre: The agency whose consent is required by Approving Load Despatch Centre for approving any outage shall be called Consenting Load Despatch Centre .Once the RPCs approve the monthly outage plan, the responsibility of approval of outages shall be as under:

Sl.No Type of Outage Consenting Load Despatch Centre

Approving Load Despatch Centre

1 765 kV or above Lines Concerned RLDCs

NLDC

2 Inter‐Regional Lines Concerned RLDCs

NLDC

3 HVDCs Concerned RLDCs

NLDC

4 International Interconnections

Concerned RLDC NLDC

5 Intra‐Regional Lines affecting transfer capability of any inter regional corridor.

Concerned RLDCs

NLDC

6 Intra‐Regional Lines which does not affect transfer capability of any inter regional corridor and included in the list of important elements of RLDCs (excluding lines covered under sl no.1,3,4 and 5)

SLDCs RLDCs

7 All other lines (excluding sl no. 1,2,3,4,5,6)

SLDC SLDC

6. Procedure for approval of outage on D‐3 basis

6.1. Planned Outages which have been approved in the OCC meeting of a region shall be considered for approval by RLDCs/NLDC on D‐3 basis. If an outage is to be availed on say 10th of the month, the indenting agency would forward such requests to the concerned RLDC on 7th of the month by 1000 hours. This practice is necessary to realize the seriousness and readiness of the agency which indented the outage request in the first place as it is observed that many outages are not

availed as per the monthly schedule. In case the request for transmission element outage is not received within the timeline prescribed above, it will be assumed that the indenting agency is not availing the outage.

6.2. Request for outages which are approved by OCC must be sent by the owner of the transmission asset at least 3 days in advance to respective RLDC by 1000 hours as per Format IV.

6.3. In case the owner is not availing the OCC approved outage, the same shall be intimated to the respective RLDC at least 3 days in advance.

6.4. Planned Outages which are approved in OCC meeting shall only be considered for approval on D‐3 basis.

6.5. Approval of Outage where Approving Authority is NLDC

6.5.1. RLDCs shall forward the request for shutdown along with their consent and observation as per Format V to NLDC/other concerned RLDCs with clear observations regarding possible constraints / contingency plan and consent including study results by 1000 hours of D‐2 day. Other concerned RLDCs would forward their observations/consent/reservations by 1600 hours of D‐2.

6.5.2. NLDC shall approve the outage along with the clear precautions/measures to be observed during the shutdown and inform all concerned RLDCs.

6.5.3. The proposed outages shall be reviewed on day ahead basis depending upon the system conditions and the outages shall be approved/refused latest by 1200 Hrs of D‐1 day. A suggestive format for approval of outage is enclosed as Format VI.

6.5.4. In case the outage is approved precautions/measures to be observed during the shutdown shall be stated. In case of refusal, clear reasons shall be stated by the RLDCs/NLDC.

6.5.5. Outages impacting the transfer capability of more than one corridor shall not be allowed simultaneously.

Sl No Activity Day Time 1 Request of shutdown from

Indenting agency to concerned RLDC.

D‐3 1000 hrs

2 Forwarding request of shutdown requiring NLDC approval from RLDC to other concerned RLDCs and NLDC (along with the recommendations and study result)

D‐2 1000 hrs

3 Comments of other RLDCs or NLDC

D‐2 1800 hrs

4 Approval or Rejection of Request

D‐1 1200 hrs

6.6. Approval of Outage where Approving Authority is RLDC

6.6.1. In case the indenting agency is a state entity, the request for transmission element outage shall be submitted to respective state load despatch centre (SLDC). SLDC shall forward the request for shutdown along with their consent and observation as per Format V to RLDC.

6.6.2. In all other cases, the request for transmission element outage shall be submitted to respective RLDC.

6.6.3. RLDC shall study the impact of proposed outages and approve / refuse the outage latest by 1200 Hrs of D‐1 day. A copy of the

approval / refusal shall also be sent to NLDC (for 400 kV and above lines). A suggestive format for approval / refusal of outage is enclosed as Format VI.

6.6.4. In case the outage is approved precautions/measures to be observed during the shutdown shall be stated. In case of refusal, clear reasons shall be stated by the SLDCs/RLDC

6.6.5. Outages in the same corridor shall not be approved simultaneously shall be rescheduled accordingly.

6.7. Approval of Outage where Approving Authority is SLDC

6.7.1. SLDC shall study the impact of proposed outages on the system and approve the outage latest by 1200 Hrs of D‐1 day. The format VI as suggested above can be used for approval / refusal of outage.

6.7.2. Outages in the same corridor shall not be approved simultaneously and shall be rescheduled accordingly.

6.8. In case of any system constraint or any other reason, approving authority may decline the proposed outage by giving the reasons for the same and tentative dates for the shutdown.

6.9. In case, any approved outage is not availed in real time, the same may not be allowed again in that month. In such a scenario, indenting agency shall be required to submit a fresh proposal in the next OCC meeting.

6.10. A list of all approved outages for the next day must be available in the RLDCs/NLDC control room by 1900 hours with a copy of the study results and special precautions, if any. This would be studied by the night shift engineers so that the outage can be facilitated the next day morning.

7. Approval of Emergency Outages

7.1. All outages which are not approved in the OCC meeting but having impact on human and equipment safety and/or to meet any other emergency requirement or special conditions shall be considered under Emergency Outage category.

7.2. The request for emergency outage shall be submitted along with the details like nature of emergency, impacts due to emergency situation, reasons and associated facts for not considering in the outage planning process.

7.3. Emergency outages shall be allowed subject to system conditions and its severity. In this case, if required, planned outage may be deferred, if possible.

7.4. Emergency outages shall be allowed immediately or within the short possible time, based on the severity of the emergency and system condition on instance to instance basis.

8. Availing Outages in real time

8.1. The agencies involved shall ensure availing of outages as per the approved schedule time.

8.2. On the day of outage, the outage availing agency shall seek the code for availing outage from respective RLDC(s) /NLDC (wherever applicable). The agencies involved shall endeavour to avail the outage with in 15mintues of availing the code but not later than 30 minutes. In case, due to any contingency, the outage could not be availed within 30 minutes, a fresh code needs to be obtained by all concerned agencies stating the reason there of Record of scheduled and actual time of outage and restoration shall be maintained at RLDCs/NLDC.

8.3. RLDCs shall prepare a monthly statement of scheduled and actual time of outage and restoration and forward the same to RPC latest

by 05th day of the next month with a copy to NLDC. The format is enclosed as Format VIIA / Format VIIB.

8.4. SLDCs shall prepare a monthly statement of scheduled and actual time of outage and restoration and forward the same to RPC latest by 05th day of the next month with a copy to concerned RLDC. The Format VIIA / Format VIIB as suggested above can be used for sending the report to RPCs.

8.5. RLDCs/NLDC shall develop a separate web based portal for information exchange subsequently, which would dispense with the need for emails.

8.6. As any deviation in the outage from the schedule can affect other planned outages as well as affect reliability and electricity markets, indenting agency must strictly adhere to the shutdown timings.

9. Normalisation of Outages

9.1. All effort shall be made by the Indenting agency to normalise the shut down within approved time period so that the transmission element is normalised within the approved time period.

9.2. On completion of the outage work, the outage availing agency shall seek the code for normalisation of elements from respective RLDC(s). The agencies involved shall endeavour to normalise the outage with in 15mintues of availing the code but not later than 30minutes. In case, due to any contingency, the normalisation could not be done with in 30minutes, a fresh code needs to be obtained by all concerned agencies stating the reason thereof.

9.3. In case of extension of a shutdown, the Indenting agency would furnish the reasons of extension, and expected normalisation time to concerned RLDC/SLDC at least one hour before the scheduled normalisation time.

9.4. Under such circumstances SLDCs/RLDCs/NLDC shall review the impact of such delay on the shutdown already approved

transmission system and would reserve the right to review for according/cancellation of the shutdown.

9.5. In case of repeated delay in normalisation of outages by any agency, the same shall be reported by SLDCs/RLDCs/NLDC to RPCs.

10. Request for charging new elements

10.1. Owner of the transmission asset shall submit the request for probable charging new elements for the next calendar month latest by 3rd day of the current month to the RPC Secretariat.

10.2. System Study sub‐committee of RPCs shall study the impact of charging of new elements and based on its recommendations, RPC shall discuss the requests for charging new elements in the OCC meeting and prepare a list of new elements to be charged during the next calendar month along with the precautions to be taken. RPC shall send the list of new elements to be charged within 3 days of the OCC meeting and latest by 18th of the month. The same shall also be displayed on RPC websites.

10.3. The owner of the new transmission element shall inform the concerned SLDC / RLDC / NLDC about the charging of the element atleast 3 days in advance.

10.4. SLDCs / RLDCs / NLDC shall study the charging of all 400 kV and above new elements and prepare charging instructions which shall be forwarded to the asset owner along with the study results with a copy to NLDC.

List of Annexures

Sl No. Format / Annexure No

Title From

(Agency)

To

(Agency)

1 Annexure I Flow Chart of Transmission Outage Planning

2 Annexure II Important Elements of NLDC

List of Formats

1 Format IA Request For Transmission Element Outage

IndentingAgency

RPC

2 Format IB Request For Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc Outage

Indenting Agency

RPC

3 Format IIA List of monthly proposed shutdowns of Transmission Lines

RPC Website

4 Format IIB List of monthly proposed shutdowns of Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc

RPC Website

5 Format IIIA List of monthly approved shutdowns of Transmission Lines

RPC NLDC/RLDC/SLDC

6 Format IIIB List of monthly approved shutdowns of Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc

RPC NLDC/RLDC/SLDC

7 Format IV Request for Transmission Element Outage

Indenting Agency

RLDC/SLDC

8 Format V Request for Transmission Element Outage

RLDC NLDC

9 Format VI Approval of Outage RLDC / NLDC

Indenting Agency/RLDC

10 Format VIIA Monthly Shutdown Report For Transmission Lines

SLDC/RLDC RPC

11 Format VIIB Monthly Shutdown Report For For Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc

SLDC/RLDC RPC

LINK Voltage Level Inter Regional Lines OWNER No. of Circuit

HVDC Link Vindhyachal Back to Back (500 MW) PG -

Agra-Gwalior I ( 765kV operated at 400kV) PG Single Circuit

Agra-Gwalior II ( 765kV operated at 400kV) PG Single Circuit

Kankroli-Zerda PG Single Circuit

Bhinmal-Zerda PG Single Circuit

Kota-Badod RAJ-MP Single Circuit

Morak-Badod RAJ-MP Single Circuit

Auraiya-Mehgaon MP-MP Single Circuit

Auraiya-Malanpur MP-MP Single Circuit

Neemuch-Udaipur MP-RAJ Single Circuit

Seopar Kalan-Sawai Madhopur MP-RAJ Single Circuit

Ranapratap Sagar-Gandhi Sagar RAJ-MP Double Circuit

Rihand-Morwa UP-MP Single Circuit

Rajghat-Lalitpur MP-UP Single Circuit

HVDC Link Bhadravati Back to Back (2x500 MW) PG -

Chikkodi- Kolhaphur KAR-MAH Double Circuit

Ambewadi-Ponda KAR-GOA Single Circuit

Ambewadi-Xeldem KAR-GOA Single Circuit

Rourkela-Raigarh PG Circuit III & I

Raigarh-Sterlite PG Circuit II & IV

Ranchi-Sipat PG Double Circuit

Budhipadar-Raigarh OD-CH Single Circuit

Budhipadar-Korba(East) OD-CH Circuit II

Budhipadar-Korba(East) PG Circuit III

Sasaram Back to Back (500 MW) PG

Sasaram-Saranath (400KV) PG Single Circuit

Sasaram-Allahabad (400KV) PG Single Circuit

765KV Gaya-Sasaram-Fatehpur PG Single Circuit

Muzaffarpur-Gorakhpur PG Double Circuit

Patna-Balia PG Four Circuits

Biharshariff-Balia PG Double Circuit

Sasaram-Balia PG Single Circuit

220KV Pusauli-Sahupuri BR-UP Single Circuit

Sone nagar-Rihand BR-UP Single Circuit

Garwah-Rihand BR-UP Single Circuit

Karmanasa-Sahupuri BR-UP Single Circuit

Karmanasa-Chandauli BR-UP Single Circuit

400 KV Jeypore-Gazuwaka Back to Back PG Double Circuit

HVDC Link Talcher-Kolar Bipole PG -

400KV Binaguri-Bongaigaon PG Double Circuit

220KV Birpara-Salakati PG Double Circuit

NR-Nepal 132 KV Tanakpur-Mahendernagar UK-NEP Single Circuit

132 KV Salakati - Geylegphug PG Single Circuit

132 KV Rangia -Matonga AS-BHU Single Circuit

400KV Binaguri -Tala-I & II ( India portion) PG Double Circuit

400KV Binaguri -Tala- IV ( India portion) PG Single Circuit

400KV Binaguri -Malbase - III ( India portion) PG Single Circuit

220KV Birpara - Chukha - I & II ( India portion) PG Double Circuit

220KV Birpara - Malbase ( India portion) PG Single Circuit

220kVWR-SR

ER-BHUTAN

220KV

ER-NER

400KV

132KV

NER-BHUTAN

ER-SR

TRANS NATIONAL LINK

HVDC Link

ER-NR

INTER REGIONAL LINK

Annexure II

WR-NR 220KV

132KV

400KV


REGION Voltage Level Inter Connection OWNER No. of Circuit

NR +/- 500KV HVDC RIHAND-DADRI BIPOLE PG -

NR +/- 500KV HVDC BALIA-BHIWADI BIPOLE PG -

WR/NR +/- 500KV HVDC MUNDRA-MOHINDERGARH- BIPOLE * APL -

WR +/- 500KV HVDC CHANDRAPUR-PADGE BIPOLE MSETCL -

765KV ANPARA C-UNNAO UPPCL SINGLE

765KV BALIA-LUCKNOW PG SINGLE

765 KV FATEHPUR-AGRA PG SINGLE

765KV MOGA-BHIWANI(PG) PG SINGLE

765KV JHATIKARA-BHIWANI PG SINGLE









765KV SEONI-BINA PG SINGLE

* A dedicated transmission system set up by M/s Adani Power Ltd.

HVDC AND 765KV LINES ( EXCLUDING INTER REGIONAL LINKS)IMPORTANT GRID ELEMENTS

NR

WR

1 KANKROLI RAPP - C- I & II 400 WR-NR

2 SINGRAULI STPS HVDC VINDHYACHAL 400 WR-NR

3 SINGRAULI STPS ANPARA 400 WR-NR

4 Bhiwani PG Mohindergarh D/C 400 WR-NR

1 Bina Gwalior I & II 400 WR-NR

2 Bina Shujalpur I & II 400 WR-NR

3 Raipur Bhadravati I 400 WR-SR, W3

4 Raipur Bhadravati II & III 400 WR-SR,W3

5 Bhadravati Bhilai 400 WR-SR,W3

6 Bhilai Koradi 400 W3

7 Seoni Bhilai 400 W3

8 Korba Vindhyachal 400 W3

9 Korba Mahan 400 W3

10 Soja Zerda 400 WR-NR

11 Ranchodpura Zerda 400 WR-NR

12 Mundra Sami 400 WR-NR

13 Raipur Wardha I & II 400 W3

14 Wardha Akola I & II 400 W3

1 RAMAGUNDAM BHADRAVATI I & II 400 WR-SR

2 RAMAGUNDAM N'SAGAR I & II 400 WR-SR

3 JEYPORE GAZUWAKA I & II 400 ER-SR

4 Vijayawada Nellore I & II 400 ER-SR

1 PURNEA MUZAFFARPUR 400 ER-NER &ER-NR

2 BIHARSHARIFF SASARAM - I & II 400 ER-NR

3 BIHARSHARIFF SASARAM - III 400 ER-NR

4 MALDA PURNEA I & II 400 ER-NER &ER-NR

5 Kahalgaon Banka I &II 400 ER-NER &ER-NR

6 Banka Biharshariff I & II 400 ER-NER &ER-NR

7 Kahalgaon Biharshariff I & II 400 ER-NER &ER-NR

8 TALCHER GMR 400 ER-SR

9 GMR MERAMUNDALI I & II 400 ER-SR

10 TALCHER ROURKELA I & II 400 ER-SR

11 KHARAGPUR KOLAGHAT 400 ER-SR

12 KOLAGHAT BARIPADA 400 ER-SR

13 FARAKKA MALDA 400 ER-NER &ER-NR

14 MAITHON KAHALGAON I & II 400 ER-NR

15 JEYPORE INDRAVATI 400 ER-SR

16 JEYPORE BOLANGIR 400 ER-SR

17 BOLANGIR MERAMUNDALI 400 ER-SR

18 Kahalgaon Barh I & II 400 ER-NR

19 Sterlite ROURKELA (LILO) II & IV 400 W3-ER

19 Rengali Keonjhar 400 ER-SR

20 Keonjhar Baripada 400 ER-SR

1 Balipara Bongaigaon I & II 400 ER-NER

2 Bongaigaon TPS (BTPS) Salakati I & II 220 ER-NER

3 Agia Sarusajai I & II 220 ER-NER

4 Balipara Samaguri 220 ER-NER

TTC / ATC impact

NORTH EASTERN REGIONSL NO FROM TO VOLTAGE

KV

SOUTHERN REGION

SL NO FROM TO VOLTAGE KV TTC / ATC impact

TTC / ATC impact

EASTERN REGIONTO VOLTAGE

KVSL NO FROM


NORTHERN REGIONSL NO FROM TO VOLTAGE

KV TTC / ATC impact

IMPORTANT LINES HAVING IMPACT ON TTC/ATC

WESTERN REGIONTTC / ATC impactSL NO FROM TO VOLTAGE

KV

Annexure I

Flow Chart: Transmission Elements Outage Planning

Inputs Activity Timelines

START

Preparation of Annual

Outage Plan by RPCs

Preparation of list of

proposed outages for next

calendar month by RPCs

Monthly review of

outage plan for next

calendar month

Finalization of outages for

next calendar month in the

OCC meeting

RPC shall display the annual

outage plan on their website by

31st December each year for the

next financial year

5th day of a month

In the OCC meeting

Latest by 15th of every

month for the next

month

Latest by last day of every

month

RPC to send list of

approved outages to

SLDCs/RLDCs/NLDC

Within 3 days of the OCC

meeting and preferably

latest by 18th of the

month

Recommendations of

Study Sub Committee

of RPCs to the OCC

Moderation of Outages

by NLDC in consultation

with RLDCs

Future Outage

plan of all

entities

Outage requests from

indenting agency to

RPCs by 3rd day of

current month

Submission to

RPC by 31st Oct

every year

Requisition for outage by

requesting agency to

RLDC/SLDC

Approval /

Refusal of

outage by

NLDC

Approval /

Refusal of outage

by RLDC/SLDC

NLDC

RLDC to forward

outage request

to NLDC along

with comments

Approving

Authority

RLDC to study the

impact of Outage on

IR Corridor

RLDC / SLDC


day


day where D is the day of

outage


day

Monthly statement of

approved shutdowns by

RLDCs/SLDCs to RPCs

Latest by 5th day of next

month for the previous

month

STOP

Execution and

Normalisation of Outage As per approved timings and

Subject to real time

conditions. In case the

shutdown is required to be

postponed, revised dates

would be suggested

SLDC to study the

impact of Outage and

gives its comments

Comments

from other

RLDCs NO YES

Date

Sl.No.


Voltage Level (kV)

From Substation




From Date

From Time

To Date

To Time Remarks

Format I(A): Request For Transmission Element Outage by Indenting agency to RPC

Line Details Proposed Date and TimeFor the MonthIndenting Agency

For the Month Date

Sl.No.





From Date

From Time

To Date



Format I(B): Request For Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc Outage by Indenting agency to RPC

Indenting Agency

Date

Sl.No.


Voltage Level (kV)

From Substation




From Date

From Time

To Date

To Time Remarks


Format II(A): List of Received Proposals for Transmission Element Outage from Different Agencies

Name of the RPC For the Month

For the Month Date

Sl.No.





From Date

From Time

To Date


Format II(B): List of Received Proposals for Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc Outage from Different Agencies

Name of the RPCLine Details Proposed Date and Time


Sl.No.


Voltage Level (kV)

From Substation




From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time


Format III(A): List of OCC approved shutdowns of Transmission Lines

Line Details Approved Date and TimeProposed Date and TimeName of the RPC


Sl.No.


Voltage Level (kV) Owner Ckt ID



From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time


Format III(B): List of OCC approved shutdowns of Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc

Approved Date and TimeName of the RPC

Name of the Element

Line Details Approved Date and Time

Format IV: Request for Transmission Element Outage by

Indenting Agency to RLDC/SLDC

Name of the Requesting Agency: Address of the Requesting Agency:

Name of the element :

Voltage Level : Owner : OCC Approved (Yes/No) : OCC Reference No. : Duration of Outage : From Date- To Date- From Time- To Time- Daily/Continuous : Reason for Outage : Approving Authority :

( ) Signature

Place: Date: Time:

Format V: Request for Transmission Element Outage by

RLDC to NLDC Name of the Requesting Agency: Name of the element :

Voltage Level (kV) : 765/400/220/230/132 Owner : OCC Approved : Yes/No OCC Reference No. : Duration of Outage : From Date- To Date- From Time- To Time- Type : Daily / Continous Reason for Outage : Consent : Yes / No Study Conducted : Yes / No Results of Study Attached: Yes / No Revision in TTC Required: Yes/No If Yes,

Conditions:

( )

Signature Place: Date: Time:

Sl.No. Corridor Original TTC Revised TTC Limiting Constraint

Format VI: Approval /Refusal of Outage by

NLDC/RLDCs/SLDCs

___________Load Despatch Centre

<Address>

<Tel No.> <Fax No.>

Approval / Refusal for Shutdown

Approval / Refusal No: Date: Time:

From: To:

Sl No

Element Start End S/D Type*

Reason

Date Time Date Time

* C: Continuous Basis, D: Daily Basis

Remarks

<Precautions/measures to be observed during the shutdown> / <Reasons for

Refusal>

Signature

Copy to:

1.

2.

3.


Approving Authority

Approval Number

Voltage Level (kV)

From Substation



Planned / Emergency


From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date


Format VII(A): Monthly Shutdown Report For Transmission Lines by RLDCs/SLDCs

Approval Details Line Details Outage Details Scheduled Date and Time Actual Date and TimeDate and Time requested

by Indenting Agency

Name of the RLDC/SLDC For the Month Issue Date

OCC Approved Date and Time


Approving Authority

Approval Number



Planned / Emergency


From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date

To Time

From Date

From Time

To Date


Format VII(B): Monthly Shutdown Report For For Bus, Bay, ICTs, Reactor, FACTS, FSCs, SVCs etc by SLDCs/RLDCsName of the RLDC/SLDC For the Month Issue Date

Actual Date and TimeOCC Approved Date and Time

Name of the element

Approval Details Line Details Outage Details Scheduled Date and TimeDate and Time requested by

Indenting Agency

to, - kar · outage coordination has been one of the important functions of regional power...

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