IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
The BOC protections are active after the Max stab time elapsed or after the GCB
was closed, then while the GCB is closed and then also during cooling (if Cooling
speed = NOMINAL).
Setpoint: Gen f del
The setpoint adjusts the delay for generator under and overfrequency protections.
The thresholds for these protections are adjusted by setpoints Gen >f and Gen <f.
NOTE:
Although the resolution of this setpoint is 0.01s, in fact the adjusted delay is
rounded to the next higher multiple of the period of the generator voltage. The
period is either 0.02s for 50Hz systems or 0.0166s for 60Hz systems. E.g. if the
delay is set to 0.03s at 50Hz system the real delay will be 0.04s.
Setpoint: BusMeasError
This setpoint is used to enable and disable the Bus meas error alarm. If enabled,
it is issued when the controller detects a mismatch between the expected and
current voltage on the busbar. The mismatch means the measured voltage is out
of limits, although the controller receives information that there is a breaker
closed, through which the bus should be supplied. The alarm is issued when the
mismatch lasts more than 20s.
The breaker mentioned above may be MCB, GCB of the respective controller or
GCB of any other controller in the group.
If there is a mismatch of bus voltage then closing of the GCB is blocked even if
the 20s delay hasn't elapsed yet.
Setpoint: Reverse power
This setpoint adjusts the threshold level for the generator reverse (negative)
power protection. The threshold is adjusted in % of the generator nominal power.
The protection activates if the generator power drops below the threshold for time
longer than ReversePwr del.
NOTE:
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