ComAp IG-NT - Generator Protections; Overload Protection (IDMT)

IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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Range: 8,0 – 40,0 V
Batt volt del [ s ]
Delay for battery voltage alarms.
Step: 1 s
Range: 0 – 600,0 s
Gener protect
The content depends on programmable protections settings. This list contains pre-set protections from
default archives + fixed protections, which are always present:
OverldStrtEval [ % ] (FV)
Specifies the overload level, where the protection evaluation starts (see figure at 2PovrldStEvDel). Under
this level the protection is not active.
Step: 1 % of Nomin power
Range: 100 – 200 %
Force value possibility: Yes
2POvrldStEvDel [ s ]
IDMT curve shape selection. 2PovrldStEvDel is the Reaction time of IDMT protection for 200% overload
Pgen = 2* OverldStrtEval.
Step: 0,1 s
Range: 0,0 - 600,0 s
Protection: BreakerOpen & Cool-down.
IDMT is inverse proportional to the generator overload. The higher the overload gets the less time will elapse
before the protection activates.
When the IDMT protection is activated the GCB is opened, the event is recorded in the Alarmlist and History,
and the engine will cool down and stop.
Where Reaction time is the amount of time from IDMT detection to the opening of the GCB.
Hint:
The maximum allowable Reaction time is 3600 sec.
Reaction time is the amount of time from IDMT detection to the opening of the GCB.
Following example shows reaction times for OverldStrtEval = 100% in dependence on generator power and
setpoint 2PovrldStEvDel value:
Pgen [%] <=100 101 102 105 110 120 150
2POvrldStEvDel [s]
0,1 No action 10 5 2 1 0,5 0,2
0,2 No action 20 10 4 2 1 0,4
0,5 No action 50 25 10 5 2,5 1
1,0 No action 100 50 20 10 5 2
1,5 No action 150 75 30 15 7,5 3
2,0 No action 200 100 40 20 10 4
2,5 No action 250 125 50 25 12,5 5
5,0 No action 500 250 100 50 25 10
10,0 No action 1000 500 200 100 50 20
2POvrldStEvDel * OverldStrtEval
Reaction time =
Pgen - OverldStrtEval