IGS-NT-BC, SW Version 1.2.0,
©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
103
).
The protection activates if the frequency in phase L3 gets over the threshold for
time longer than
N
OTE
:
The generator overfrequency protection is
Breaker open and cool down (BOC)
type.
N
OTE
:
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: Bank <f
Group
Bank protect
Range [units]
Related FW
3.0
Force value
possible
YES
Description
This setpoint adjusts the threshold level for the generator underfrequency
protection. The threshold is adjusted in % of the system frequency (
The protection activates if the frequency in phase L3 drops below the threshold for
time longer than
N
OTE
:
The generator underfrequency protection is
Breaker open and cool down (BOC)
type.
N
OTE
:
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: Bank f del
Group
Bank protect
Range [units]
0.00 .. 600.00 [s]
Related FW
3.0
Description
The setpoint adjusts the delay for generator under and overfrequency protections.
The thresholds for these protections are adjusted by setpoints
N
OTE
:
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.
