3.8 NEGATIVE SEQUENCE OVERCURRENT PROTECTION
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
DT operate +/- 2% or 60 ms, whichever is greater
DT Reset Setting +/- 5%
3.8.1 NPSOC DIRECTIONAL PARAMETERS
Directional boundary pick-up (RCA +/-90%) +/-2°
Directional boundary hysteresis < 1°
Directional boundary repeatability < 1%
3.9 CIRCUIT BREAKER FAIL AND UNDERCURRENT PROTECTION
I< Pick-up Setting +/- 10% or 0.025 In, whichever is greater
I< Drop-off Setting +/- 5% or 20 mA, whichever is greater
Operate time < 12 ms
Timers +/- 2% or 20 ms, whichever is greater
Reset time < 15 ms
3.10 BROKEN CONDUCTOR PROTECTION
Pick-up Setting +/- 2.5%
Drop-off 0.95 x Setting +/- 2.5%
DT operate +/- 2% or 40 ms, whichever is greater
Reset time <25 ms
3.11 THERMAL OVERLOAD PROTECTION
Thermal alarm pick-up Calculated trip time +/- 10%
Thermal overload pick-up Calculated trip time +/- 10%
Cooling time accuracy +/- 15% of theoretical
Repeatability <5%
Note:
Operating time measur
ed with applied current of 20% above thermal setting.
P54A/B/C/E Chapter 22 - Technical Specifications
P54xMED-TM-EN-1 515
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