Synchrophasor Initiative in India - erldc

SYNCHROPHASORS - INITIATIVE IN INDIA JUNE 20125.6.2 Case Study-30: Oscillation with single ckt of 765 kV Tehri-Meerut D/CTehri HEP had reported that oscillations were observed at their station whenever only one out ofthe two circuits of the 765kV Tehri-Meerut line (charged at 400 kV) is in service and thegeneration at Tehri HEP exceeded 700 MW.Figure 94: Connectivity diagram of Tehri Hydro stationFigure 94 shows the connectivity diagram of Tehri Hydro station in Northern regionAn exercise was carried out on 3rd Feb 2011 from 11.25 hrs to 11.35 hrs to examine theoscillation phenomenon and ascertain the loadability of the line. Unit # 4 of Tehri HEP wassynchronized at 11:25 Hrs of 03rd February 2011. The 765 kV Tehri-Koteshwar-Meerut ckt#1was out of service and only 765kV Tehri-Meerut ckt # 2 was in service. Generation at Tehri HEPwas increased to increase the power flow of this line upto 1050 MW. The synchrophasor datawas analyzed for the event.POSOCO Page 99 of 143