•
There are enough gensets available under PMS control to supply the required power to each busbar section.
◦
If the required GENSET controllers are in SEMI mode, then their gensets must be
connected
.
◦
GENSET controllers in AUTO mode need not be connected. The power management system can start and connect them as
necessary.
•
If the only power supply to a busbar section is a shaft generator, then that shaft generator must be
connected
.
•
If the only power supply to a busbar section is a shore connection, then that shore connection must be
connected
.
How it works
The following flowchart and description show how the busbar is split.
The following flowchart shows the sequence that the controller normally uses to open the bus tie breaker (BTB). This sequence is
also used for the alarm action
PMS-controlled open breaker
.
Table 12.5
Splitting the busbar flowchart
Open bus tie
breaker signal
Start genset(s)
on busbar A
Need power
on busbar A
No
Yes
Check load on
busbar sections
Open bus tie
breaker
Need power
on busbar A
No
Yes
Power
management
on busbar A
Power
management
on busbar B
Start genset(s)
on busbar B
Need power
on busbar B
No
Yes
Need power
on busbar B
No
Yes
Enough
power on both
busbars
No
Yes
Info message
Info message
Info message
1.
Open bus tie breaker signal:
The BUS TIE
breaker controller gets a signal to open the
bus tie breaker.
2.
Check load on busbar sections:
The BUS
TIE breaker controller checks the load on the
busbars that would be created if the bus tie
breaker is opened.
3.
Need power on busbar #:
If more power is
needed on a busbar, more gensets are
started. If there is still not enough power, the
BUS TIE breaker controller display unit shows
the info message
Busbar split not possible
.
4.
Open bus tie breaker:
If there is enough
power on both of the busbars, then the
controller opens the bus tie breaker.
5.
Power management on busbar #:
After the
bus tie breaker is opened, the busbar sections
operate independently, with separate power
management on each busbar section.
12.3.2 Connecting busbar sections
The busbar sections can be connected to form one busbar section by closing the bus tie breaker. The signal to close the bus tie
breaker can come from:
DESIGNER'S HANDBOOK 4189340911K UK
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