Sensitive Earth Fault Protection; Sensitive Earth Fault Protection Directional Element; High Impedance Restricted Earth Fault Protection; Negative Sequence Overcurrent Protection - GE MiCOM P40 Technical Manual

P446SV
3.8

SENSITIVE EARTH FAULT PROTECTION

IDMT pick-up
DT Pick-up
Drop-off (IDMT + DT)
IDMT operate
DT operate
DT reset
Repeatability
Note:
Reference conditions: TMS = 1, TD = 1, IN> setting = 100 mA with operating range of 2-20Is.
3.8.1

SENSITIVE EARTH FAULT PROTECTION DIRECTIONAL ELEMENT

Pick-up P = 0 W
Pick-up P > 0 W
Drop-off P = 0 W
Drop-off P > 0 W
Boundary accuracy
Repeatability
3.9

HIGH IMPEDANCE RESTRICTED EARTH FAULT PROTECTION

Pick-up
Drop-off
Operating time
High set pick-up
High set operating time
Repeatability
3.10

NEGATIVE SEQUENCE OVERCURRENT PROTECTION

IDMT pick-up
DT pick-up
Drop-off (IDMT and DT)
IDMT operate
DT operate
DT Reset
P446SV-TM-EN-1
1.05 x Setting +/-5%
Setting +/- 5%
0.95 x Setting +/-5%
+/- 5% or 40 ms, whichever is greater*
+/- 2% or 50 ms, whichever is greater
Setting +/- 5% or 50 ms, whichever is greater
< 5%
Wattmetric SEF
High Impedance and Low Impedance
Setting formula +/- 5%
0.8 x Setting formula +/-5%
< 60 ms
Setting +/- 10%
< 30 ms
< 5%
Chapter 26 - Technical Specifications
ISEF > +/-5% or 5 mA
P > +/-5%
0.95 x ISEF> +/- 5% or 5 mA
0.9 x P> +/- 5% or 5 mA
+/-5% with hysteresis < 1°
< 1%
1.05 x Setting +/-5%
Setting +/- 5%
0.95 x Setting +/-5%
+/- 5% or 40 ms, whichever is greater
+/- 2% or 60 ms, whichever is greater
Setting +/- 5%
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