~ 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
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 SIPAT-BILASPUR 2 PG SINGLE
765KV SEONI-BILASPUR 1 PG SINGLE
765KV SEONI-BILASPUR 2 PG SINGLE
765KV SEONI-WARDHA 1 PG SINGLE
765KV SEONI-WARDHA 2 PG SINGLE
765KV BINA-SATNA 1 PG SINGLE
765KV BINA-SATNA 2 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
IMPORTANT GRID ELEMENTS
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
Latest by 1000 Hrs of D-3
day where D is the day of
outage
Latest by 1000 Hrs of D-2
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.
Name of the Requesting Agency
Voltage Level (kV) Owner
Inter Regional / Intra Regional
Daily/ Continous Reason
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.
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
Line Details Proposed Date and Time
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.
Name of the Requesting Agency
Voltage Level (kV) Owner
Inter Regional / Intra Regional
Daily/ Continous Reason
From Date
From Time
To Date
To Time RemarksName of the Element
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.
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
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
For the Month Issue Date
Sl.No.
Name of the Requesting Agency
Voltage Level (kV) Owner Ckt ID
Inter Regional / Intra Regional
Daily/ Continous Reason
From Date
From Time
To Date
To Time
From Date
From Time
To Date
To Time
Control Area/ Corridor impacted Remarks
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
To Substation Owner Ckt ID
Inter Regional / Intra Regional
Planned / Emergency
Daily/ Continous Reason
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
Sl.No.Reuesting Agency
Approving Authority
Approval Number
Voltage Level (kV) Owner
Inter Regional / Intra Regional
Planned / Emergency
Daily/ Continous Reason
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(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
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
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 SIPAT-BILASPUR 2 PG SINGLE
765KV SEONI-BILASPUR 1 PG SINGLE
765KV SEONI-BILASPUR 2 PG SINGLE
765KV SEONI-WARDHA 1 PG SINGLE
765KV SEONI-WARDHA 2 PG SINGLE
765KV BINA-SATNA 1 PG SINGLE
765KV BINA-SATNA 2 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
IMPORTANT GRID ELEMENTS
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
Latest by 1000 Hrs of D-3
day where D is the day of
outage
Latest by 1000 Hrs of D-2
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.
Name of the Requesting Agency
Voltage Level (kV) Owner
Inter Regional / Intra Regional
Daily/ Continous Reason
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.
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
Line Details Proposed Date and Time
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.
Name of the Requesting Agency
Voltage Level (kV) Owner
Inter Regional / Intra Regional
Daily/ Continous Reason
From Date
From Time
To Date
To Time RemarksName of the Element
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.
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
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
For the Month Issue Date
Sl.No.
Name of the Requesting Agency
Voltage Level (kV) Owner Ckt ID
Inter Regional / Intra Regional
Daily/ Continous Reason
From Date
From Time
To Date
To Time
From Date
From Time
To Date
To Time
Control Area/ Corridor impacted Remarks
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
To Substation Owner Ckt ID
Inter Regional / Intra Regional
Planned / Emergency
Daily/ Continous Reason
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
Sl.No.Reuesting Agency
Approving Authority
Approval Number
Voltage Level (kV) Owner
Inter Regional / Intra Regional
Planned / Emergency
Daily/ Continous Reason
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(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