GE P24DM - SEF Directional Parameters; Restricted Earth Fault Protection; Negative Sequence Overcurrent Protection

3.3.1 SEF DIRECTIONAL PARAMETERS
Wattmetric SEF accuracy
Pick-up for P = 0 W ISEF > +/-5% or 5 mA
Pick-up for P > 0 W P > +/-5%
Drop-off for P = 0 W 0.95 x ISEF> +/- 5% or 5 mA
Drop-off for P > 0 W 0.9 x P> +/- 5% or 5 mA
Boundary accuracy +/-5% with hysteresis < 1°
Repeatability +/- 5%
SEF CosΦ accuracy
Pick-up Setting +/-5% for angles RCA+/-60°
Drop-off 0.9 x setting
Repeatability +/- 2%
SEF SinΦ accuracy
Pick-up Setting +/-5% for angles RCA+/-60° to RCA+/-90°
Drop-off 0.9 x setting
Repeatability +/- 2%
3.4 RESTRICTED EARTH FAULT PROTECTION
High Impedance Retricted Earth Fault (REF) accuracy
Pick-up Setting formula +/- 5%
Drop-off 0.95 x Setting formula +/-5%
Operating time < 30 ms
High pick-up Setting +/- 10%
Repeatability < 15%
Low Impedance Retricted Earth Fault (REF) accuracy
Pick-up Setting formula +/- 5%
Drop-off 0.9 x Setting formula +/-5%
Operating time < 60 ms
High pick-up Setting +/- 5%
Repeatability < 15%
3.5 NEGATIVE SEQUENCE OVERCURRENT 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 60 ms, whichever is greater (1.05 – <2) Is
+/- 5% or 40 ms, whichev
er is greater (2 – 20) Is
Chapter 21 - Technical Specifications P24xM
436 P24xM-TM-EN-2.1