Manual 37128A GCP-20 Series - Genset Control
© Woodward Page 51/190
Emergency Power Operation
The described emergency power operation is valid for the following logics:
• Parallel switch logic [GCP-22]
• Open transition switch logic [GCP-20/22]
• Closed transition switch logic [GCP-20/22]
• Interchange switch logic [GCP-22]
Emergency power op-
eration
Following the detection of an emergency power case, the emergency power delay is first fin-
ished before starting the genset. On reaching the voltage and frequency limit values, the
MCB is opened, and the GCB is then switched to the dead busbar. The unit takes over the
supply of the isolated network.
Return of the Mains
Return of the Mains for Parallel Switch Logic [GCP-22]
Return of the mains
After the return of the mains voltage the mains settling time is still finished before the unit
re-synchronizes the mains circuit breaker. After closing the mains power circuit breaker, the
unit assumes its original operating mode. If the generator is shut off, power reduction is car-
ried out provided that the active power controller is activated.
If the mains returns during starting, the mains power circuit breaker is not opened. During
the mains settling time, the unit operates without load, in order to enable the immediate con-
nection of the GCB in the event of further mains alarms.
Return of the Mains for Open Transition Switch Logic [GCP-20/22]
Return of the mains
After return of the mains voltage, the mains settling time is first finished, before the mains
circuit breaker is switched back by the unit via a dead busbar. If, following the expiry of the
mains settling time, an operating request is present, the unit remains in isolated operation.
If the mains returns during starting, the mains power circuit breaker is not opened. During
the mains settling time, the unit operates without load, in order to enable the immediate con-
nection of the GCB in the event of further mains alarms.
Return of the Mains for Closed Transition Switch Logic [GCP-20/22]
Return of the mains
After the return of the mains voltage the mains settling time is first finished. If no operating
request is present, reverse synchronization of the MCB is carried out following the expiry of
this time. Following the closure of the mains power circuit breaker, the generator power cir-
cuit breaker is opened immediately and without any reduction in power.
If the mains returns during starting, the mains power circuit breaker is not opened. During
the mains settling time, the unit operates without load, in order to enable the immediate con-
nection of the GCB in the event of further mains alarms.
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