Flowchart for the shore connection breaker close for ship-to-ship
SCB close
command
Ship-to-ship
input
No
Yes
Normal SCB
close sequence
Receiving
ship V&Hz
OK
No
Yes
Sync with
receiving ship
Synchronised
No
Yes
Sync timer
expired
No
Yes
SCB sync
failure
Close SCB
SCB closed
No
Yes
SCB close
failure
SCB closed
Receiving
ship blackout
Yes
No
Power
available
No
Yes
Ship-to-ship
not possible
Start more
gensets
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.
Ship-to-ship input:
If the
Ship-to-ship supply
input is not
active, then the controller uses the standard SCB close
sequence.
3.
Power available:
The controller checks that the close
conditions are okay:
•
The SHORE connection controller must not be under
SWBD control.
•
Enough power must be available.
•
All connected GENSET controllers must be under PMS
control (that is, there must be no connected GENSET
controllers under switchboard control).
•
The load for the receiving ship must be less than the
shore connection nominal power.
4.
Receiving ship V&Hz OK:
The controller checks whether
the voltage and frequency on the receiving ship are within the
allowed range.
•
If there is a blackout on the receiving ship, the controller
closes the breaker.
•
If there is not a blackout on the receiving ship, but the
voltage and frequency are not within range, then ship-to-
ship is not possible.
•
If the voltage and frequency are within range, the PMS
tries to synchronise.
◦
When the ship busbar and receiving ship are
synchronised, the controller activates the
Breakers >
Shore connection breaker > Control > SCB close
output to close the breaker.
◦
If the ship busbar and the receiving ship do not
synchronise within the time allowed, then the
controller activates an
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 ship-to-ship SCB close
sequence has been completed successfully.
•
If the SCB has not closed, an alarm is activated.
Ship-to-ship active as an inhibit
When the ship-to-ship function is active in a SHORE connection controller, the following protections are deactivated by the
Ship-to-
ship active
inhibit:
•
Reverse power 1 and 2
•
Reactive power import
DESIGNER'S HANDBOOK 4189340911K UK
Page 389 of 521