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4.
PROTECTION FUNCTIONS
4.1. Function 50. Instantaneous phase overcurrent
This protection function can be set by using three parameters:
Group Description Minimum Maximum Step Unit Default
50_1
50_2
Instantaneous phase overcurrent
Permission - - YES/NO - No
Tap 0.10 30,00 0.01 Inominal 5,00
Time delay 0.02 300,0 0.01 s 0,02
The Time delay is independent from the operating current flowing through the equipment, so if
the phase current exceeds its predetermined value for an equal or greater amount of time than
this preset value, the protection function activates (trips) and does not reset itself until the
average value of the phase drops below the point of current pick-up.
The function activates at 100% of the preset input, and deactivates at 95%. The reset is
instantaneous.
The accuracy of the Time delay is equal to the preset time ±30 ms or ±0.5%
4.2. Function 50/51. Inverse time phase overcurrent
This protection function can be set by using five parameters:
Group Description Minimum Maximum Step Unit Default
50/51
Inverse time phase overcurrent
Permission - - YES/NO - No
Curve - - (1*) -
IEC Extrem.
Inverse
Dial (TMS) 0.02 2.20 0.01 - 1,25
Tap 0.10 7.00 0.01 I
nominal
1,00
Time delay 0.02 300.0 0.01 s 0,02
(1*) IEC Inverse, IEC Very Inverse , IEC Extremely Inverse , IEC long time inverse, IEEEInverse, IEEEvery inverse,
IEEEextremely inverse, Defined time