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ISSUE OF CONCERN HIGH VOLTAGES IN VEMAGIRI 400 KV • VOLTAGES AT VEMAGIRI COMPLEX (GAS GENERATORS) ARE EXTREMELY HIGH • GENERTOR TAPS ARE SUB-OPTIMAL – TAP CHANGE MESSAGE IS ISSUED BY SRLDC – DISCUSSED IN OCC – JAN 2010 ALS • IPP’S TO FULLY CO-OPERATE FOR BETTER VOLTAGE CONTROL AT VEMAGIRI CONDENSOR MODE OPERATION IN AP • CONDENSOR MODE OPERATION IS A VALUABLE RESOURCE FOR SYSTEM OPERATORS – INCREASED SHORT CIRCUIT LEVEL- VOLTAGE EXCURSIONS LIMITED – QUICK CONVERSION TO GENERATOR MODE DURING CONTINGENCY – PREVENTS OPENING OF TRUNK LINES ON OVER VOLTAGE – HEATING AND WINDAGE-FRICTION LOSSES ARE THE ISSUES • GENERATORS CAPABLE OF RUNNING IN THIS MODE IN AP – SRISAILAM LEFT BANK (CAPABLE OF 4 QUADRANT) • SRISAILAM AREA PRONE TO HIGH VOLTAGES, • SSLM-NUNNA BOTH CIRCUITS ARE OPENED OUT – IMPACT ON RELIABILITY – N’SAGAR • WOULD HELP CONTROL VOLTAGES AT N’SAGAR AND GOOTY AREAS RING MAIN FOR HYDERABAD DEFENCE PLAN FOR LARGE METROPOLITAN AREAS • VLPGO DELIBERATED ON THE ISSUE OF ‘PREVENTION OF BLACKOUTS ON SUPER-LARGE METROPOLITAN CITIES’ • EVERY MAJOR CITY MUST HAVE A DEFENCE PLAN • INDIA HAS FOCUSSED ON ROBUST RING MAINS FOR RELIABILITY CENTRAL TOKYO GRID THIS PART OF RING ALSO NEEDS STRENGTHENING OPTION: CONNECT E-CITY TO HOSUR 400 KV. ADVANTAGE OF SEPARATE SOURCE FOR BANGALORE (FROM TN) AND SHORT PATH. ROW OF EXISTING 220 KV YERRANDAHALLI-HOSUR CAN BE USED) LILO OF YELAHANKASOMANAHALLI AT NELAMANGALA WEAK LINK IN RING MAIN CAN BE MADE D/C ONE SECTION AT A TIME USING SAME ROW TO HOSUR USING ROW OF 22 KV YERRANDAHALLIHOSUR CHENNAI AREA PROPOSED THIRUVELAM CHENNAI RING MAY BE MODIFIED SLIGHTLY DUE TO BAY AVAILABILITY CONSTRAINTS RING MAIN FOR HYDERABADSECUNDERABAD METRO AREA GAJWEL MALKARAM FROM RAMAGUNDAM GENERATING STATION • RING MAIN TO BE EXPEDITED • SEPARATE INFEEDS FOR GAJWEL, Y’MAILARAM AND MALKARAM TO BE THOUGHT OF • ISLANDING SCHEME FOR HYDERABAD TWIN CITY WITH RAMAGUNDAM IS IN ADVANCED STAGE YEDDUMAILAR AM GHANAPUR MAMIDAPALLI EXISTING EXISTING NETWORK ISSUES • NUNNA-NELLORE 400 KV D/C LINE – 345 KMS LONG, REACTORS AT BOTH ENDS – WITH VEMAGIRI GENERATION COMING UP, NUNNA-NELLORE IS FULLY LOADED – LIMITING LINE LENGTH WOULD IMPROVE ITS LOADABILITY – LILO OF THIS LINE AT SUITABLE PLACE WOULD HELP • SRISAILAM-KURNOOL-GOOTY EXPERIENCES HEAVY LOADING WITH FULL GENERATION AT SRISAILAM FGMO TRIAL OPERATION