Table 5.28
Default parameters
Parameter Range
Default
Delay
30 s to 5 min
•
GENSET, EMERGENCY genset, SHAFT generator, SHORE connection controllers: 1 min
•
BUS TIE breaker controller: 2 min
Enable
Not enabled, Enabled Enabled
5.5.2 De-load failure
This alarm alerts the operator to breaker de-load failure.
The alarm is based on the load across the breaker, as measured by the controller. When the
controller internal set point has ramped down to the breaker open point, the timer starts. The
controller activates the alarm if the load across the breaker is not reduced to the
Open point (de-
loading)
within the delay time.
0
Set
point
Value
Time
Delay
Configure the parameters under
Configure > Parameters > Breakers > [Breaker] monitoring > De-load failure
.
The
Open point (de-loading)
is configured under
Configure > Parameters > Breakers > [Breaker] configuration > Configuration
.
Table 5.29
Default parameters
Parameter
Range
Default
Delay
0.0 s to 1 h
10.0 s
Enable
Not enabled, Enabled
Enabled
Alarm action
Warning
Effect of de-load ramp example
The genset is running at 50 % of nominal power. The
breaker open point is 5 % of nominal power. The graph
shows the power set point in blue, and the genset power in
black. The breaker opens in time, and there is no de-load
error.
50 %
Power
5 %
Open
point
Time
Effect of slow de-loading example
The genset is running at 50 % of nominal power. The
breaker open point is 5 % of nominal power. The graph
shows the power set point in blue, and the genset power in
black. The de-loading is a lot slower than the power set
point ramp down. The breaker does not open in time, and
there is a de-load error alarm.
50 %
Power
5 %
Open
point
Time
More information
See
Regulation
for more de-loading information.
DESIGNER'S HANDBOOK 4189340911K UK
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