3.10 SENSITIVE EARTH FAULT PROTECTION
IDMT pick-up 1.05 x Setting +/-5%
DT Pick-up Setting +/- 5%
Drop-off (IDMT + DT) 0.95 x Setting +/-5%
IDMT operate +/- 5% or 40 ms, whichever is greater*
DT operate +/- 2% or 50 ms, whichever is greater
DT reset Setting +/- 5% or 50 ms, whichever is greater
Repeatability < 5%
Note:
Reference conditions: TMS = 1, TD = 1, IN> setting = 100 mA with operating range of 2-20Is.
3.10.1
SENSITIVE EARTH FAULT PROTECTION DIRECTIONAL ELEMENT
Wattmetric SEF
Pick-up P = 0 W ISEF > +/-5% or 5 mA
Pick-up P > 0 W P > +/-5%
Drop-off P = 0 W 0.95 x ISEF> +/- 5% or 5 mA
Drop-off P > 0 W 0.9 x P> +/- 5% or 5 mA
Boundary accuracy +/-5% with hysteresis < 1°
Repeatability < 1%
3.11 HIGH IMPEDANCE RESTRICTED EARTH FAULT PROTECTION
High Impedance and Low Impedance
Pick-up Setting formula +/- 5%
Drop-off 0.8 x Setting formula +/-5%
Operating time < 60 ms
High set pick-up Setting +/- 10%
High set operating time < 30 ms
Repeatability < 5%
3.12 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%
Chapter 27 - Technical Specifications P543i/P545i
726 P54x1i-TM-EN-1
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