IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
The setpoint adjusts the delay for generator under- and overvoltage protections.
The thresholds for these protections are adjusted by setpoints Gen >V BOC, Gen
<V BOC and Gen >V Sd.
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: Gen >f
This setpoint adjusts the threshold level for the generator overfrequency
protection. The threshold is adjusted in % of the system frequency (Nominal Freq
+ Nom frq offset).
The protection activates if the frequency in phase L3 gets over the threshold for
time longer than Gen 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).
Setpoint: Gen <f
This setpoint adjusts the threshold level for the generator underfrequency
protection. The threshold is adjusted in % of the system frequency (Nominal Freq
+ Nom frq offset).
The protection activates if the frequency in phase L3 drops below the threshold for
time longer than Gen f del.
NOTE:
The generator underfrequency protection is Breaker open and cool down (BOC)
type.
NOTE:
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