Steam Turbine Trip on Low Forward Power

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our steam turbine of combine cycle power plant (GTG+STG= 72+40) is ruining on 10 MW; suddenly it trip on reverse power relay. and after that it is running on 7 MW and suddenly trip on low forward power. both the time steam turbine parameter is ok. so problem
 
Operation... you mentioned STG parameters for both "disturbances" were OK! Can you provide:

1) The pre-and post-trip MW, MVAr, Volt & Amps, values?

2) The trip (or alarm) setting for the Rev and Lo-Fwd Relays, in percent of STG rating?

3) The relay Manufacturer?

Regards,
Phil Corso
 
Operation... further to my earlier post:

4) Is the STG connected to a local or aux bus supplying loads considered critical for the safe and orderly shutdown of the STG?

Phil
 
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