3.4 EARTH FAULT PROTECTION
Accuracy - Measured
IDMT pick-up 1.05 x setting +/-5%
DT pick-up Setting +/-5%
Drop-off (IDMT and DT) 0.98 x setting +/-5%
IDMT Operate +/-5% or 40 ms, whichever is greater*
IEEE reset +/-5% or 40 ms, whichever is greater
Pick-up and drop-off repeatability < 2.5%
DT operate +/-2% or 50 ms, whichever is greater
DT reset +/-5%
Accuracy - Derived
IDMT pick-up 1.05 x setting +/-5%
DT pick-up Setting +/-5%
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
Pick-up and drop-off repeatability < 5%
DT operate time +/-2% or 50 ms, whichever is greater
DT reset time +/-2% or 50 ms, whichever is greater
Note:
Refer
ence conditions: TMS = 1, TD = 1, IN> setting = 1 A with operating range of 2-20In
3.4.1 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%
P14x Chapter 23 - Technical Specifications
P14xEd1-TM-EN-1 537
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