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The unit is a Frame 5, Generator Alstom, System Mark VI, EX9100.
After a stop of 3 years, the turbine has been revised, generator changed.
Today we tried to synchronize without success:
* FSNL is reached
* P125GEN is connected on TTUR card terminal #3
* N125GEN is connected on TTUR card terminal #8
* we chose auto synch --> L25P and L83AS permissive switch to 1 --> all permissives seem ok --> but no change on K25P relay on TTUR card --> the contact between terminal #4 and #5 does not close
* the auto synch mode is trying to synchronize, the K25 relay on TTUR card is activated at each turn --> the contact between terminal #5 and #6 closes each synch try.
* the third relay K25A is not moving, neither the contact between #5 and (#6 or #7)
* we tried to change the relays without success
* we tried to change the TTUR card without success
* we tried to change the VTUR card without success.
I think the problem is on the K25P action not working (permissive).
Is there any permissive else than the L25P signal acting on the relay that is needed? Maybe on VPRO?
We disconnected the command to the 52G to measure a signal but we have nothing.
Thanks in advance for any help.
Regards
Vincent
After a stop of 3 years, the turbine has been revised, generator changed.
Today we tried to synchronize without success:
* FSNL is reached
* P125GEN is connected on TTUR card terminal #3
* N125GEN is connected on TTUR card terminal #8
* we chose auto synch --> L25P and L83AS permissive switch to 1 --> all permissives seem ok --> but no change on K25P relay on TTUR card --> the contact between terminal #4 and #5 does not close
* the auto synch mode is trying to synchronize, the K25 relay on TTUR card is activated at each turn --> the contact between terminal #5 and #6 closes each synch try.
* the third relay K25A is not moving, neither the contact between #5 and (#6 or #7)
* we tried to change the relays without success
* we tried to change the TTUR card without success
* we tried to change the VTUR card without success.
I think the problem is on the K25P action not working (permissive).
Is there any permissive else than the L25P signal acting on the relay that is needed? Maybe on VPRO?
We disconnected the command to the 52G to measure a signal but we have nothing.
Thanks in advance for any help.
Regards
Vincent