5.5.12 Any bus tie breaker position failure
This alarm is for any bus tie breaker position
failure.
The alarm is based on the breaker feedback
signals, which are digital inputs to the controller.
The alarm is activated if the breaker Closed and
Open feedbacks are both missing for longer than
the delay time. The alarm is also activated if the
breaker Closed and Open feedbacks are both
present for longer than the delay time.
The alarm is activated in ALL of the controllers in
the sections connected to the bus tie breaker.
This alarm is always enabled.
0
1
Breaker
open
feedback
Time
Delay
Breaker
closed
feedback
Breaker
position
OK
0
1
0
1
0
1
Breaker
open
feedback
Time
Delay
Breaker
closed
feedback
Breaker
position
OK
0
1
0
1
Parameters
Configure the parameters under Configure > Parameters > System > Monitoring > Any bus tie breaker position failure.
Table 5.38
Default parameters
Parameter Range Default
Alarm action Warning
All affected controllers under switchboard control
If the Any bus tie breaker position failure alarm is activated, the controller cannot be sure whether the breaker is open or closed. The
power management system therefore forces ALL the controllers in the sections connected to the bus tie breaker under switchboard
control. The controllers remain under switchboard control until the position failure is fixed.
INFO
This alarm is only activated if the controller is in contact with the bus tie breaker's controller.
Effect of redundant breaker feedback
If redundant breaker feedback is configured for the bus tie breaker, then this alarm only activates when a bus breaker position failure
is detected on all breaker feedbacks.
DESIGNER'S HANDBOOK 4189340911K UK Page 167 of 521
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