Parameters
Configure this parameter under
Configure > Parameters > Local power management > Bus tie breaker > Supply mode after
BTB close
.
Parameter
Range
Default
Comment
Supply mode
after
connecting
•
Stay on DG
supply
•
Stay on
SG/SC
supply
Stay on
DG supply
•
Stay on DG supply
: After the bus tie breaker is closed, the power
management system automatically de-loads any shaft generator or shore
connection supply. The power management system then automatically opens
the shaft generator breaker or shore connection breaker. In this way, the
connected busbar runs on a genset supply.
•
Stay on SG/SC supply
: After the bus tie breaker is closed, the power
management system automatically de-loads the gensets. The power
management system then automatically opens the genset breakers. In this
way, the connected busbar runs on only a shaft generator or shore connection
supply.
How it works
The following flowchart and description show how the busbar sections are connected.
Table 12.7
Connecting the busbar sections flowchart
Close bus tie
breaker signal
Syncronise
busbar A and
busbar B
Change to the
selected supply
mode
Power
management
on connected
busbar
Close the bus
tie breaker
Busbars
synchronised
No
Yes
Sync. timer
expired
No
Yes
Alarm
1.
Synchronise busbar A and busbar B:
After getting the signal to close the
bus tie breaker, the power management system regulates the gensets on
either side of the bus tie breaker.
•
If a shaft generator or shore connection is
connected
to one of the
busbars, the power management system only regulates the gensets on
the other busbar.
2.
Busbars synchronised:
When the busbars are synchronised, the power
management system automatically closes the bus tie breaker. If the busbars
do no synchronise within the time available, the controller activates a
BTB
synchronisation failure
alarm.
3.
Change to selected supply mode:
If a shaft generator or shore connection
was connected to one of the busbar sections, then the power management
system regulates the system and opens breakers so that the connected
busbar sections run on the supply selected in the parameter described
above.
4.
Power management on connected busbar:
The power management
system controls the connected busbar sections as one busbar section.
12.3.3 Bus tie breaker blackout close
More information
See
Power management
,
Blackout
for the sequence that the controller uses to close the bus tie breaker if there is a
blackout on one of the busbars.
DESIGNER'S HANDBOOK 4189340911K UK
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