What are the signs that the unit should be shutdown due to line unbalance? Are Phase Temps a good or the only indication? What can be done to fix the problem or where who one start to troubleshoot the problem. This happens at 1.0 MW or at 8.0 MW. Does come down with lowering load.

Thanks

 

Responding to Turbine 7777’s 27-Feb-08 (23:39) call for help... negative sequence is usually caused by voltage or current unbalance.

Normally, the generator is able to tolerate a small amount of continuous negative sequence current. Exact amount is very dependent on machine characteristics! Please send operating details:

1) Nameplate data, i.e., MVA, pf, freq, poles, kV, A, driver type.

2) Exciter volts and amps.

3) Actual phase currents.

4) Actual phase-phase volts.

5) Actual phase-neutral volts.

6) Actual exciter volts and amps.

Regards, Phil Corso ([email protected])

 

Turbine 7777, although the lead-in to your thread asks about negative sequence impacting gas turbine operation, the thread references only the generator!

Please clarify your query. Are you inquiring about the turbine or the generator or both?

Regards, Phil Corso ([email protected])

 

I will send in tomorrow, as I am at home and do not have the exact data you requested. Thanks for the reply.