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SHUTDOWN ON NUNNANELLORE BOTH CIRCUITS STUDY RESULTS AND PROPOSED ACTION PLAN HIGHLIGHTS OF THE SHUTDOWN 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 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 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 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 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) 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 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