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Hi All
Problem - Frame 6B machine MVAR suddenly dropped from 6.5 MVAR to -16.6 MVAR.Details :
Total 5 GAS turbines were in service at 00:28 and one of the machine MVAR dropped from 6.5 MVAR to -16.6 MVAR, Power factor remained same at 0.936 and Gen Volt Dropped below 9.8KV and it was observed other machines MVAR increased to compensate the VAR.
No maintenance activity done on this machine from past 4 to 5 months related to Gen or Turbine.
The alarms we recieved during this event and prior to this event in MARK V are :
00:27:06.843 TRUE FORCED LOGIC SIGNAL DETECTED
00:27:09.000 FALSE FORCED LOGIC SIGNAL DETECTED
00:27:37.000 TRUE Voter mismatch,<S> _L0067_SP
00:27:37.031 TRUE DIAGNOSTIC ALARM <C> <Q>
00:27:37.000 FALSE Voter mismatch,<S> _L0067_SP
00:28:36.000 TRUE Voter mismatch <R> SVL
00:28:36.000 TRUE Voter mismatch <R> SFL2
00:28:41.000 FALSE Voter mismatch <R> SVL
00:28:41.000 FALSE Voter mismatch <R> SFL2
00:28:54.000 TRUE Voter mismatch <T> SVL
00:28:54.000 TRUE Voter mismatch <T> SFL2
00:29:00.000 FALSE Voter mismatch <T> SVL
00:29:00.000 FALSE Voter mismatch <T> SFL2
Same alarms kept toggling upto 15min.
Is there any relation to LOGIC FORCING DETECTED ALARAM to this ? because we recieved this alaram just before the MVAR drop.
In actual there was no LOGIC FORCING done but how this alarm got generated ?
If there is any relation to both or anyone faced similar problem give your views
ty
Problem - Frame 6B machine MVAR suddenly dropped from 6.5 MVAR to -16.6 MVAR.Details :
Total 5 GAS turbines were in service at 00:28 and one of the machine MVAR dropped from 6.5 MVAR to -16.6 MVAR, Power factor remained same at 0.936 and Gen Volt Dropped below 9.8KV and it was observed other machines MVAR increased to compensate the VAR.
No maintenance activity done on this machine from past 4 to 5 months related to Gen or Turbine.
The alarms we recieved during this event and prior to this event in MARK V are :
00:27:06.843 TRUE FORCED LOGIC SIGNAL DETECTED
00:27:09.000 FALSE FORCED LOGIC SIGNAL DETECTED
00:27:37.000 TRUE Voter mismatch,<S> _L0067_SP
00:27:37.031 TRUE DIAGNOSTIC ALARM <C> <Q>
00:27:37.000 FALSE Voter mismatch,<S> _L0067_SP
00:28:36.000 TRUE Voter mismatch <R> SVL
00:28:36.000 TRUE Voter mismatch <R> SFL2
00:28:41.000 FALSE Voter mismatch <R> SVL
00:28:41.000 FALSE Voter mismatch <R> SFL2
00:28:54.000 TRUE Voter mismatch <T> SVL
00:28:54.000 TRUE Voter mismatch <T> SFL2
00:29:00.000 FALSE Voter mismatch <T> SVL
00:29:00.000 FALSE Voter mismatch <T> SFL2
Same alarms kept toggling upto 15min.
Is there any relation to LOGIC FORCING DETECTED ALARAM to this ? because we recieved this alaram just before the MVAR drop.
In actual there was no LOGIC FORCING done but how this alarm got generated ?
If there is any relation to both or anyone faced similar problem give your views
ty