Transcript SHUTDOWN ON KALPAKA-SIMHADRI BOTH CIRCUITS

SHUTDOWN ON NUNNANELLORE BOTH CIRCUITS
STUDY RESULTS AND
PROPOSED ACTION PLAN
HIGHLIGHTS OF THE SHUTDOWN
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400 KV D/C NUNNA-NELLORE-SRIPERUMBUDUR
LINE IS A VITAL LINK
TYPICAL FLOW IS IN THE ORDER OF 330-380 MW
EACH
OUTAGE OF BOTH CIRCUITS IN PRESENT
CONDITION WOULD MEAN INCREASED LOADINGS
ON OTHER 400 KV NETWORK LINES IN AP AS WELL
AS OVERLOADING THE 220 KV NETWORK OF
APTRANSCO
LARGE VOLTAGE DIPS WOULD ALSO OCCUR IN
CUDDAPAH, GOOTY, BANGALORE AND MADRAS
PREVENTATIVE ACTIONS
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REDUCTION OF GENERATION IN VTS/LANCO BY 350-400 MW
REDUCED GENERATION IN SILERU BASIN AND SRISAILAM LEFT
BANK
STRICTLY NO OVERDRAWALS BY TN-KERALA AND KARNATAKA
AND UNDERDRAWALS BY AP
NO LOAD CHANGE-OVERS IN AP DURING THE SHUTDOWN
REGULATE GENERATION AT SIMHADRI ,COASTAL GAS IN CASE OF
OVERLOADING OF CDP-MDS/CDP-KOLAR LINE.
IMPROVE VOLTAGES AT CUDDAPAH, GOOTY, BANGALORE AND
MADRAS : BUS REACTORS TO BE TAKEN OUT IN ADVANCE
INCREASED FILTER COMMITMENT AT KOLAR
NO OTHER LC TO BE TAKEN IN THIS PERIOD ESPECIALLY OF VTS
EVACUATION LINES – IF INEVITABLE LC ‘S MAY BE STAGGERED
SO THAT NETWORK IS NOT SEVERELY DEFORMED
IMPORT AT GAZUWAKA WILL BE MINIMISED
PLANNING FOR OUTAGE
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INITIALLY AT THE TIME OF SHUT-DOWN, VTS/LANCO TO BE
REDUCED BY AROUND 400 MW
MINIMISE GENERATION AT SILERU BASIN
REDUCTION IN GENERATION AT SIMHADRI, COASTAL GAS IF
FLOW ON THE LINES ARE NOT BELOW 200 MW EACH
NO LOAD CHANGE OVERS FOR THE PERIOD OF SHUT DOWN
IN N.COASTAL AP
FREQUENCY TO BE MAINTAINED AT 49.8 HZ AND ABOVE
MORE HYDRO MACHINES TO BE ON BARS AS RESERVE
ALL UNITS > 50 MW TO BE ON FGMO
DF/DT AND U/F RELAYS TO BE IN SERVICE
KOLAR INTER-TRIP SCHEME TO BE IN SERVICE
NELLORE LINES CAN BE IDLE-CHARGED FROM MADRAS FOR
VOLTAGE SUPPORT
CONTINGENCY PLAN
CONTINGENCY:-TRIPPING OF 400 KV CUDDAPAH-MADRAS DURING LC
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EFFECT: LARGE VOLTAGE DIP OF MORE THAN 15 KV AT CUDDAPAH,
BANGALORE AND MADRAS:- NELLORE LINE CAN BE IDLE-CHARGED
FROM MADRAS
 400 KV CUDDAPAH-KOLAR LINE LOADING MAY GO EVEN ABOVE 700
MW.
 POSSIBLE SEPARATION OF AP-KARNATAKA FROM TN-KERALA GRID IN
CASE THE LOADING ON CRITICAL LINES ARE NOT CONTROLLED
IMMEDIATELY
REMEDIAL ACTION: IMMEDIATE REDUCTION IN VTS/LANCO GENERATION BY FURTHER
400MW OR MAY BE BY BRINGING SOME UNITS ON HOUSE LOAD
 REDUCTION IN GENERATION BY SIMHADRI AND COASTAL GAS
STATIONS TO REDUCE LOADING ON CDP-KOLAR TO AROUND 450500 MW
 IMMEDIATE LOAD SHEDDING BY TN-KERALA
 EXPORT TO ER/WR IF POSSIBLE
 INCREASED IMPORT AT KOLAR
 REDUCTION IN RAMAGUNDAM GENERATION IN CASE LINE
LOADINGS ON CRITICAL LINES STILL REMAIN HIGH
CONTINGENCY PLAN
CONTINGENCY:-TRIPPING OF 400 KV CUDDAPAH-KOLAR DURING LC
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EFFECT: LARGE VOLTAGE DIP OF MORE THAN 15 KV AT CUDDAPAH,
BANGALORE AND MADRAS:-NELLORE LINE CAN BE IDLE-CHARGED
FROM MADRAS
 400 KV CUDDAPAH-MADRAS LINE LOADING MAY GO EVEN ABOVE
700 MW.
 POSSIBLE SEPARATION OF AP-KARNATAKA FROM TN-KERALA GRID IN
CASE THE LOADING ON CRITICAL LINES ARE NOT CONTROLLED
IMMEDIATELY
REMEDIAL ACTION: IMMEDIATE REDUCTION IN VTS/LANCO GENERATION BY FURTHER
400MW OR MAY BE BY BRINGING SOME UNITS ON HOUSE LOAD
 REDUCTION IN GENERATION BY SIMHADRI AND COASTAL GAS
STATIONS TO REDUCE LOADING ON CDP-MADRAS TO AROUND 450500 MW
 IMMEDIATE LOAD SHEDDING BY TN-KERALA-KARNATAKA(BLR AREA)
 EXPORT TO ER/WR IF POSSIBLE
 INCREASED IMPORT AT KOLAR
 REDUCTION IN RAMAGUNDAM GENERATION IN CASE LINE
LOADINGS ON CRITICAL LINES STILL REMAIN HIGH
CONTINGENCY PLAN(CONTD)
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CONTINGENCY:- TRIPPING OF ONE LINE OF TALCHER-KOLAR
REMAINING POLE ON GR MODE
EFFECT: FLOW WILL BE REDUCED TO 500 MW
 LOSS OF 800-900 MW
 RUN-BACK AT TALCHER WOULD ACT
 SR INTER-TRIP SCHEME WOULD ACT
 FREQ DIP OF AROUND 1 HZ EXPECTED IN SR GRID
 DF/DT AND UFR TO BE IN SERVICE
REMEDIAL ACTION: FREQUENCY SHOULD BE MANTAINED 49.8 Hz AND ABOVE
 ALL GENERATORS 50MW AND ABOVE SHOULD BE ON FGMO
 IMMEDIATE REDUCTION IN VTS/LANCO GENERATION BY 250-300 MW
 REDUCTION IN GENERATION BY SIMHADRI AND COASTAL GAS
STATIONS TO REDUCE LOADINGS ON CDP-KOLAR, CDP-MADRAS AND
GTY-HOODY
 LOAD SHEDDING BY TN-KERALA AND KARNATAKA
 EXPORT TO ER/WR IF POSSIBLE
 REDUCTION IN RAMAGUNDAM GENERATION IN CASE LINE LOADINGS
ON CRITICAL LINES STILL REMAIN HIGH
CONTINGENCY PLAN(CONTD)
CONTINGENCY:- TRIPPING OF BOTH POLES AT KOLAR
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EFFECT:LOSS OF 1200-1400 MW
RUN-BACK AT TALCHER WOULD ACT
SR INTER-TRIP SCHEME WOULD ACT
FREQ DIP OF MORE THAN 1.2 HZ EXPECTED IN SR GRID
DF/DT AND UFR TO BE IN SERVICE
REMEDIAL ACTION : IMPORT FROM ER AT GAZUWAKA MAY HAVE TO BE
INCREASED. THIS HAS TO BE DONE DEPENDING ON LOADING OF
CUDDAPAH-KOLAR AND CUDDAPAH-MADRAS LINES
 FREQUENCY SHOULD BE MANTAINED 49.8 Hz AND ABOVE
 ALL GENERATORS 50MW AND ABOVE SHOULD BE ON FGMO
 IMMEDIATE REDUCTION IN VTS/LANCO GENERATION BY 300-400 MW
 REDUCTION IN GENERATION BY SIMHADRI AND COASTAL GAS
STATIONS TO REDUCE LOADINGS ON CDP-KOLAR, CDP-MADRAS AND
GTY-HOODY
 LOAD SHEDDING BY TN-KERALA AND KARNATAKA
 EXPORT TO ER/WR IF POSSIBLE
 REDUCTION IN RAMAGUNDAM GENERATION IN CASE LINE LOADINGS
ON CRITICAL LINES STILL REMAIN HIGH