ComAp IG-NT GC Reference Manual page 88

Range [units] 0 .. 10000 [A]
This setpoint adjust the level of EarthFault Current when IDMT protection starts to get evaluated. Time of
evaluation of this protection is given by the setpoint
the level given by Nom EthFltCurr, protection starts decreasing its thermal counter. For more information
about this protection, refer to the setpoint
2EthFltCur del
OFF, 0.1 .. 600.0 [s]
Range [units] OFF, 0.1 .. 600.0 [s]
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
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 IDMT
XAMPLE OF CURRENT PROTECTION CURVE
N :
OTE
The IDMT EarthFault Current protection is Breaker open and cool down (BO) type.
N :
OTE
This protection's internal counter accumulates and it starts continuously decreasing when the EarthFault
Current goes below Nom
EarthFault Current goes below
breaker with thermal current protection.
ExcitationLoss
Range [units] 0 .. 150 [%]
This setpoint adjusts excitation loss protection level. Corresponding level in kVA is calculated from
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
Inteli NT GeCon-MARINE SPI, SW Version 3.2, ©ComAp – July 2015
IGS-NT-GeCon-MARINE-SPI-3.2.PDF
2EthFltCur
Nom EthFltCurr.
EthFltCurr. This function prevents the protection from completely reseting when the
Nom EthFltCurr for only a short period of time. This behavior emulates circuit-
[%]
ExctLoss
2EthFltCur del. When the EarthFault Current goes below
del.
del.
nominal
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