IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
EXAMPLE OF IDMT CURRENT PROTECTION CURVE
NOTE:
The IDMT EarthFault Current protection is Breaker open and cool down (BOC)
type.
NOTE:
This protection's internal counter accumulates and it starts continuously decreasing
when the EarthFault Current goes below Nom EthFltCurr. This function prevents
the protection from completely reseting when the EarthFault Current goes below
Nom EthFltCurr for only a short period of time. This behavior emulates circuit-
breaker with thermal current protection.
Setpoint: ExcitationLoss
This setpoint adjusts excitation loss protection level. Corresponding level in kVA is
calculated from nominal power of gen-set as a negative percentage given by this
setpoint (e.g. this setpoint is adjusted to 50% and nominal power of gen-set is 200
kW, therefore excitation loss protection level is set to -100 kVAr)
Delay for this protection is given by the setpoint ExctLoss del.
This protection is breaker off and cooldown type. For more information on
protection types please refer to the section Alarm types.
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