4.4 EARTH FAULT PROTECTION
Accuracy
IDMT pick-up 1.05 x Setting +/-5%
DT pick-up Setting +/-5%, or 20 mA, whichever is greater
Measured drop-off (IDMT and DT) 0.95 x setting +/-5% or 20 mA, whichever is greater
Derived drop-off (IDMT and DT) 0.9 x setting +/-5% or 20 mA, whichever is greater
IDMT Operate +/-5% or 40 ms, whichever is greater*
IEEE reset +/-5% or 40 ms, whichever is greater
Pick-up and drop-off repeatability < 2%
DT operate time +/-2% or 50 ms, whichever is greater
DT reset time +/- 5%
Note:
R
eference conditions: TMS = 1, TD = 1, IN> = 1A, operating range = 2-16In
4.4.1 EARTH FAULT DIRECTIONAL PARAMETERS
Measured and Derived
Vpol pick-up Vpol +/-5% or 50 mV, whichever is greater
Vpol drop-off 0.95 x Vpol +/-5% or 50 mV, whichever is greater
Directional boundary pickup (RCA +/-90%) +/- 2°
Directional boundary hysteresis < 1°
Directional boundary repeatability < 1%
4.5 NEGATIVE SEQUENCE OVERCURRENT PROTECTION
Pick-up (IDMT and DT) Setting +/-5% or 20 mA, whichever is greater
Drop-off (IDMT and DT) 0.95 x Setting +/-5% or 20 mA, whichever is greater
Pick-up and drop-off repeatability < 1%
Disengagement time < 35 ms
DT operate +/- 2% or 60 ms, whichever is greater
Operate time repeatability < 6 ms
4.5.1 NPSOC DIRECTIONAL PARAMETERS
Directional boundary pick-up (RCA +/-90%) +/-2°
Directional boundary hysteresis < 2°
Directional boundary repeatability < 2%
Vpol pickup Setting +/-5% or 50 mV, whichever is greater
Vpol drop-off 0,95 x setting +/-5% or 50 mV, whichever is greater
Chapter 21 - Technical Specifications P64x
462 P64x-TM-EN-1.3
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