ComAp IG-NT Reference Manual page 91

Step: 1 % of Nomin power
Range: 0 – 100 % of Nomin power
Force value possibility: Yes
Hint:
If the setpoint Base load is lower than setpoint Gener protect: Min power PtM, the gen-set requested load is
set to Gener protect: Min power PtM.
The value of Min Power PtM is ignored during Warming procedure.
The setpoint is used as a limit for Low power protection: if it becomes active, the load is ramped-down using
setpoint Sync/Load strl: Load ramp, to Min power PtM. After protection becomes inactive, the power
limitation is automatically terminated.
Ishort
If the level set in this setpoint is reached, the GCB is opened with delay defined in Ishort del. Intended for
shortcurrent detection.
Step: 1 % of Nomin current
Range: 100 - 500 % of Nomin current
Protection: BreakerOpen & Cool-down.
Ishort del
Delay for generator shortcurrent protection.
Step: 0,02 s
Range: 0,00 – 10,00 s
Hint:
Ishort del can be set to 0,01 s but this value is rounded to the proximate controller evaluation period.
2Inom del
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 - 600,0 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.
Reaction time =
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
2Inom del
0,1 No action
0,2 No action
0,5 No action
1,0 No action
Inteli NT MINT, SW Version 2.6, ©ComAp – November 2011
IGS-NT-MINT-2.6-Reference Guide.PDF
[ % ]
[ s ]
[ s ]
2Inom del * Nomin current
Igen - Nomin current
101 102
10 5
20 10
50 25
100 50
105 110 120
2 1 0,5
4 2 1
10 5 2,5
20 10 5
150 200
0,2 0,1
0,4 0,2
1 0,5
2 1
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