Inteli NT GeCon MINT, SW Version 1.4, ©ComAp – June 2007
IGS-NT-GeCon-MINT-1.4.PDF
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2Inom del [ s ]
IDMT curve shape selection. 2Inom del is the Reaction time of IDMT protection for 200% overcurrent
Igen = 2* Nominal current.
Step: 0,1 s
Range: 0,0 - 60,0 s
Protection: BreakerOpen & Cool-down.
IDMT is inversely proportional to the generators overcurrent. The higher the overcurrent gets the less time
will elapse before the protection is activated.
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 900 sec.
Reaction time is the amount of time from IDMT detection to the opening of the GCB.
Igen is the maximum current of the three phases of generator current.
EXAMPLE of Reaction time for different over current levels.
Igen [%] <=100 101 102 105 110 120 150 200
2Inom del
0,1 No action 10 5 2 1 0,5 0,2 0,1
0,2 No action 20 10 4 2 1 0,4 0,2
0,5 No action 50 25 10 5 2,5 1 0,5
1,0 No action 100 50 20 10 5 2 1
2,0 No action 200 100 40 20 10 4 2
5,0 No action 500 250 100 50 25 10 5
10,0 No action No action 500 200 100 50 20 10
20,0 No action No action No action 400 200 100 40 20
50,0 No action No action No action No action 500 250 100 50
!!! VERY IMPORTANT !!!
• The maximum input range of the controller current terminals is 11 Amps. Anything over this
value is displayed as measured limit, e.g. 15 Amps from CT is measured and displayed as 11
Amps.
• Take special care when selecting CT’s. All available 5 Amp CT’s do not have a range up to 11
Amps.
2Inom del * Nomin current
Reaction time =
Igen - Nomin current
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