ComAp IG-NT GC, Справочное руководство

Страница: 105 / 260

IGS-NT-BC, SW Version 1.2.0,
©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
105
Description 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.
E
XAMPLE OF
IDMT
CURRENT PROTECTION CURVE
N
OTE
:
The IDMT EarthFault Current protection is Breaker open and cool down (BOC)
type.
N
OTE
:
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: Bank V unbal
Group Bank protect
Range [units] 0 .. 200 [%]
Related FW 3.0
Description 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