InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf, ©ComAp – April 2015
7.6.2.2.2 Stopping sequence
As it is written above, the power management is based on the load evaluation in order to provide
enough of available running power. An additional gen-set stops when the load of the system drops
below certain level to avoid inefficient run of the gen-set. Following figure depicts the situation when
a gen-set is requested to stop due to the power management.
Power [kW]
Sum of available nominal
power – running gen-sets
in PM
Total Load of
the system
Level to stop additional gen-set
Nom Pwr in PM - #LoadResStop X
Nom G1
Time
Nom
G1+G2
Time
Gen 2
#NextStop del
Soft unloading
GCB opened
Loaded
Gen 1
BO Syst res OK
Stopped and ready to PM
Cooling
Running Running
Figure: Stopping sequence
As shown above, the system load has decreased below the level defined by the stop condition –
i.e. the load reserve is over a limit given by the setpoint Pwr management: #LoadResStop. Further
explication is provided in chapters Absolute Power Management and Relative Power Management
The level is illustrated by the red dashed line. If the load reserve keeps over this limit for longer time
than defined by setpoint Pwr management: #NextStopDel del, the next gen-set is actually requested
to stop. Once the gen-set is unloaded, the GCB breaker is opened. Please note the sum of nominal
power of all gen-sets on the bus is decreased by the nominal power of the stopped gen-set.
The cooling sequence follows before the gen-set is actually stopped. The gen-set is ready to be
started if the system load increases again.
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