Accuracy
IDMT operate +/-5% of expected operating time or 40 ms, whichever is greater*
IEEE reset +/-5% or 40 ms, whichever is greater
DT operate +/-2% of setting or 40 ms, whichever is greater
DT reset Setting +/-5%
Repeatability <5%
Characteristic UK IEC 60255-3 1998
Characteristic US IEEE C37.112 1996
Note:
*R
eference conditions: TMS = 1, TD = 7, I> = 1A, operating range = 2-20In
3.4.1 PHASE OVERCURRENT DIRECTIONAL PARAMETERS
Accuracy
Directional boundary pickup (RCA +/-90%) +/-2°
Directional boundary hysteresis < 2°
Directional boundary repeatability <2%
3.5 EARTH FAULT PROTECTION
Accuracy
IDMT pick-up 1.05 x Setting +/-5%
DT pick-up Setting +/-5%, or 20 mA, whichever is greater
Drop-off (IDMT and DT) 0.95 x setting +/-5%
IDMT Operate +/-5% or 40 ms, whichever is greater*
IEEE reset +/-10% or 40 ms, whichever is greater
Repeatability < 5%
DT operate +/-2% or 50 ms, whichever is greater
DT reset +/- 5% or 50 ms, whichever is greater
Note:
R
eference conditions: TMS = 1, TD = 1, IN> = 1A, operating range = 2-20In.
3.5.1 EARTH FAULT DIRECTIONAL PARAMETERS
Zero Sequence Polarising accuracy
Directional boundary pick-up (RCA +/- 90°) +/-2°
Hysteresis <3°
VN> pick-up Setting+/-10%
VN> drop-off 0.9 x Setting +/-10%
Negative Sequence Polarising accuracy
Directional boundary pick-up (RCA +/- 90°) +/-2°
P54A/B/C/E Chapter 22 - Technical Specifications
P54xMED-TM-EN-1 513
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