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 AVOID-MINIMISE-MITIGATE

CENTRAL TOKYO GRID

CAN BE MADE D/C ONE SECTION AT A TIME USING SAME ROW OPTION: WEAK LINK IN RING MAIN CAN BE MADE D/C ONE SECTION AT A TIME USING SAME ROW 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 YELAHANKA-SOMANAHALLI AT NELAMANGALA TO HOSUR USING ROW OF 220 KV YERRANDAHALLI-HOSUR THIS PART OF RING ALSO NEEDS STRENGTHENING

CHENNAI AREA PROPOSED THIRUVELAM CHENNAI RING MAY BE MODIFIED SLIGHTLY DUE TO BAY AVAILABILITY CONSTRAINTS

RING MAIN FOR HYDERABAD-SECUNDERABAD METRO AREA GHANAPUR EXISTING FROM RAMAGUNDAM GENERATING STATION GAJWEL YEDDUMAILARAM MALKARAM MAMIDAPALLI 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

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