we are running frame 5 turbine (PG5371PA) in isochronous mode at load 16.96 MW. Turbine connected load is constant as plant load is constant. plant load varies up to 50-200 KW. base load rating is 22.4 MW. All running parameter was stable. At Mark VIe panel, "Back up reference Temp active " alarm appeared yesterday and turbine running parameter starts hunting.
load varies from 16.96 to 15.8 MW. but TNR value was constant 102.8. no change in TNR when speed is varying.
speed hunting from 5123 to 5092. TNH varies from 99.7 to 100.4.
fsr varies from 50 to 42
TTXM varies to 528 to 512
FSRT, FSRACC, FRSN also varies. FSRmin, FSRSD, FSRSU was constant.
P2 pressure is very unstable it varies from 16.4 to 12.4 while FPRG was 14.8. gas fuel supply pressure is stable. Hydraulic oil pressure is stable.
CPD was also changes as IGV changes.
Generator frequency also changes as speed changes.
TTRXP-537, TTRXS- 550.6, TTKI-520 degree before hunting.
As parameter hunting starts
we put IGC Temp control mode put Off, but no change in hunting
we switch GT to droop control from Isochronous mode, but no change in parameter hunting again we switched to isochronous mode.
we check SRV/GCV in field. they are also fluctuating.
Please suggest for checking of scope and reason of the problem.
load varies from 16.96 to 15.8 MW. but TNR value was constant 102.8. no change in TNR when speed is varying.
speed hunting from 5123 to 5092. TNH varies from 99.7 to 100.4.
fsr varies from 50 to 42
TTXM varies to 528 to 512
FSRT, FSRACC, FRSN also varies. FSRmin, FSRSD, FSRSU was constant.
P2 pressure is very unstable it varies from 16.4 to 12.4 while FPRG was 14.8. gas fuel supply pressure is stable. Hydraulic oil pressure is stable.
CPD was also changes as IGV changes.
Generator frequency also changes as speed changes.
TTRXP-537, TTRXS- 550.6, TTKI-520 degree before hunting.
As parameter hunting starts
we put IGC Temp control mode put Off, but no change in hunting
we switch GT to droop control from Isochronous mode, but no change in parameter hunting again we switched to isochronous mode.
we check SRV/GCV in field. they are also fluctuating.
Please suggest for checking of scope and reason of the problem.