INFO
For the percent method, the load-dependent stop limit must be LOWER than the load-dependent start limit.
Equally sized gensets example
The section has three 1000 kW gensets. The priority order is A, B, C.
Start 1 > Load limit
is 90 %, and
Stop 1 > Load limit
is 70 %.
Genset A always runs.
Genset B starts when the load is 900 kW, and stops when the load is 700 kW. The hysteresis is 200 kW.
Genset C starts when the load is 1800 kW, and stops when the load is 1400 kW. The hysteresis is 400 kW.
Different gensets example
Genset A has a nominal power of 2000 kW and has first priority. Genset B has a nominal power of 1000 kW and has
second priority. Genset C has a nominal power of 500 kW and has third priority.
Start 1 > Load limit
is 90 %, and
Stop 1 >
Load limit
is 70 %.
Genset A always runs.
Genset B starts when the load is 1800 kW, and stops when the load is 1400 kW. The hysteresis is 400 kW.
Genset C starts when the load is 2700 kW, and stops when the load is 2100 kW. The hysteresis is 600 kW.
INFO
The hysteresis for the power method works differently. See
Power method and hysteresis
.
7.4.10 Non-connected genset
Controller type: Only GENSET controllers
The non-connected genset function stops a genset from running for too long without connecting. The function is only active when
the controller is in AUTO mode. That is, if a genset is running with its breaker open, this function stops the genset when its timer
expires.
The function may be needed in the following situations:
•
The operator first starts the genset with the GENSET controller in SEMI mode, and then switches to AUTO mode.
•
There has been a precautionary genset start, but the busbar stabilised, and the started genset was not needed.
Configure the parameter under
Configure > Parameters > Local power management > Non-connected genset > Stop timer
.
Parameter
Range
Default
Notes
Delay
0 s to 1 h
1 min
The timer starts when both of these conditions are met:
•
The genset start sequence is finished.
•
The genset is ready to connect.
The timer resets if any of the following happens:
•
The breaker close sequence starts.
•
The stop sequence starts.
•
There is a genset alarm.
When the timer expires, the controller stops the genset engine.
DESIGNER'S HANDBOOK 4189340911K UK
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