IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
Setpoint: Ishort
This setpoint adjusts the threshold level (in % of the nominal current) for the
generator fast overcurent protection. The protection is activated (alarm Ishort is
issued) when the generator current in at least one phase exceeds the threshold
limit for time longer than Ishort del.
NOTE:
The protection type is Breaker open and cool down (BOC).
Setpoint: Ishort del
This setpoint adjust the delay for generator fast overcurrent protection. The limit
for the protection is adjusted by the setpoint Ishort.
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: 2Inom del
This setpoint adjusts the reaction time of the IDMT overcurrent protection if the
overcurrent level is 200% of the nominal current.
The reaction time of the IDMT overcurrent protection is not fixed; it depends on
how much is the actual current above the limit (nominal). The higher is the
overcurrent the shorter the reaction time will be.
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