IS-NT-Async-SPI, SW Version 1.2, ©ComAp – February 2011
IS-NT-Async-SPI-1.2.PDF
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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 [ s ]
Delay for generator shortcurrent protection.
Step: 0,02 s
Range: 0,00 – 10,00 s
Hint:
Ishort del can be set in GenConfig to 0,01 s, but this value is rounded to the proximate controller evaluation
period, which is 0,02 s when the frequency is 50Hz.
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
2Inom del * Nomin current
Reaction time =
Igen - Nomin current
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