Table 11.6
Shore connection breaker (SCB) close flowchart
SCB close
command
Shore
connection
V&Hz OK
No
Yes
Sync with
shore
connection
Synchronised
No
Yes
Sync timer
expired
No
Yes
Close SCB
SCB closed
No
Yes
SCB closed
Info message
Alarm
Alarm
Close
conditions
OK
No
Yes
Info message
1.
SCB close command:
The shore connection breaker
(SCB) close command can come from the following:
•
The operator can press the push-button
Close
breaker
on the display unit.
•
The operator can use PICUS to send a close breaker
command.
•
The command can come from an external source.
2.
Shore connection V&Hz OK:
The controller checks
whether the voltage and frequency from the shore
connection are within the allowed range. If not, the
controller display unit shows an info message.
3.
Close conditions OK:
The controller checks that the
close conditions are okay:
•
The SHORE connection controller must not be under
SWBD control.
•
The ship busbar voltage and frequency must be
within the nominal range.
•
All connected GENSET controllers must be under
PMS control (that is, there must be no connected
GENSET controllers under switchboard control).
•
The nominal power of the shore connection must be
more than the required power.
•
The load on the ship busbar must be more than the
load required by the
Minimum load on ship busbar
parameter.
•
Another shore connection must not be connected to
the same busbar section, unless
Multiple shore
connections allowed
is enabled.
•
A shaft generator must not be connected to the same
busbar section.
4.
Sync with shore connection:
The Power Management
System tries to synchronise the ship busbar to the shore
connection.
•
When the shore connection and busbar are
synchronised, the controller activates the close shore
connection breaker output to close the breaker.
•
If the shore connection and the busbar do not
synchronise within the time allowed, the controller
activates a
SCB sync failure
alarm and the sequence
ends.
5.
SCB closed:
The controller checks whether the SCB
has closed.
•
If the SCB has closed, the SCB close sequence has
been completed successfully.
•
If the SCB has not closed, the
SCB close failure
alarm is activated.
Changing from genset supply to shore connection
The operator can start the change from genset supply to shore connection by activating the close breaker sequence of the shore
connection breaker. The SHORE connection controller must not be under SWBD control.
If the GENSET controllers are in AUTO mode, after the shore connection is connected, the GENSET controllers will disconnect and
stop the gensets after the cooldown period.
DESIGNER'S HANDBOOK 4189340911K UK
Page 382 of 521
