IGS-NT-BC, SW Version 1.2.0, ©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
This setpoint adjusts the reaction time of the IDMT EarthFault Current protection if
the current is 200% of the base level given by the setpoint Nom EthFltCurr.
The reaction time of the IDMT EarthFault Current protection is not fixed; it depends
on how much is the current above the limit (base level). The higher is the current
the shorter the reaction time will be.
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.
This setpoint adjusts the threshold level for the generator voltage unbalance
protection. The threshold is adjusted in % of the nominal generator voltage, which
is either BankNomV or BankNomVph-ph, depending on the position of the
setpoint FixVoltProtSel. The protection is Breaker open and cool down type and is
created in the default archive as universal analog protection at the value Gen
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