3.8.1 TRANSIENT OVERREACH AND OVERSHOOT
Additional tolerance due to increasing X/R ratios +/-5% over the X/R ratio of 1 to 90
Overshoot of overcurrent elements < 30 ms
3.8.2 PHASE OVERCURRENT DIRECTIONAL PARAMETERS
Accuracy
Directional boundary pickup (RCA +/-90%) +/-2°
Directional boundary hysteresis < 2°
Directional boundary repeatability <2%
3.9 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:
Reference conditions: TMS = 1, TD = 1, IN> = 1A, operating range = 2-20In.
3.9.1
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°
Hysteresis <3°
VN2> pick-up Setting+/-10%
VN2> drop-off 0.9 x Setting +/-10%
IN2> pick-up Setting+/-10%
IN2> drop-off 0.9 x Setting +/-10%
P543i/P545i Chapter 27 - Technical Specifications
P54x1i-TM-EN-1 725
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