IGS-NT-BC, SW Version 1.2.0, ©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
Freq).
The protection activates if the frequency in phase L3 gets over the threshold for
time longer than Bank f del.
NOTE:
The generator overfrequency protection is Breaker open and cool down (BOC)
type.
NOTE:
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).
This setpoint adjusts the threshold level for the generator underfrequency
protection. The threshold is adjusted in % of the system frequency (Nominal
Freq).
The protection activates if the frequency in phase L3 drops below the threshold for
time longer than Bank f del.
NOTE:
The generator underfrequency protection is Breaker open and cool down (BOC)
type.
NOTE:
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).
The setpoint adjusts the delay for generator under and overfrequency protections.
The thresholds for these protections are adjusted by setpoints Bank >f and Bank
<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.
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