1. ISSUE OF CONCERN

2. 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

3. 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

4. RING MAIN FOR HYDERABAD

5. 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

6. CENTRAL TOKYO GRID

8. 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

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

10. 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

11. 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

12. FGMO TRIAL OPERATION