GB close
signal
GB open
No
Yes
Genset
started
No
Yes
TB closed
No
Yes
Voltage on
emergency
busbar
No
Yes
Sync GB
Synchronised
No
Yes
Timer expired
Yes
No
Close GB
GB closed
No
Yes
GB closed
TB sync.
enabled
No
Yes
Trip TB
Alarm
Alarm
Info message
Info message
1.
GB open:
After getting the GB close signal, the controller
checks whether the generator breaker is open. If the generator
breaker is already closed, the sequence stops.
2.
Genset started:
The controller checks whether the emergency
genset started successfully. If not, the controller display unit
shows an info message.
3.
TB closed:
The controller checks whether the breaker can be
closed without synchronisation.
•
If the tie breaker is open, the controller closes the generator
breaker without synchronisation.
•
If
Tie breaker sync. enabled
is not enabled, the controller
trips the tie breaker and closes the generator breaker
without synchronisation.
•
If there is no voltage on the emergency busbar, the
controller closes the generator breaker without
synchronisation.
•
Otherwise, the controller synchronises the genset to the
busbar. If the synchronisation timer expires before the
synchronisation is completed, the
Synchronisation failure
alarm is activated.
4.
GB closed:
The controller checks whether the generator
breaker has closed.
•
If the generator breaker has not closed the
GB close failure
alarm is activated.
•
If the generator breaker has closed, the generator breaker
close sequence has been completed successfully.
9.5.4 Generator breaker open flowchart
The opening sequence of the generator breaker for the emergency genset is the same as for a standard genset generator breaker.
More information
See
GENSET controller
,
Generator breaker
,
Generator breaker open flowchart
for more information.
DESIGNER'S HANDBOOK 4189340911K UK
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