Sef Directional Parameters; Restricted Earth Fault Protection; Negative Sequence Overcurrent Protection - GE P24DM Technical Manual

Chapter 21 - Technical Specifications
3.3.1

SEF DIRECTIONAL PARAMETERS

Pick-up for P = 0 W
Pick-up for P > 0 W
Drop-off for P = 0 W
Drop-off for P > 0 W
Boundary accuracy
Repeatability
Pick-up
Drop-off
Repeatability
Pick-up
Drop-off
Repeatability
3.4

RESTRICTED EARTH FAULT PROTECTION

Pick-up
Drop-off
Operating time
High pick-up
Repeatability
Pick-up
Drop-off
Operating time
High pick-up
Repeatability
3.5

NEGATIVE SEQUENCE OVERCURRENT PROTECTION

IDMT pick-up
DT pick-up
Drop-off (IDMT + DT)
IDMT operate
436
Wattmetric SEF accuracy
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°
+/- 5%
SEF CosΦ accuracy
Setting +/-5% for angles RCA+/-60°
0.9 x setting
+/- 2%
SEF SinΦ accuracy
Setting +/-5% for angles RCA+/-60° to RCA+/-90°
0.9 x setting
+/- 2%
High Impedance Retricted Earth Fault (REF) accuracy
Setting formula +/- 5%
0.95 x Setting formula +/-5%
< 30 ms
Setting +/- 10%
< 15%
Low Impedance Retricted Earth Fault (REF) accuracy
Setting formula +/- 5%
0.9 x Setting formula +/-5%
< 60 ms
Setting +/- 5%
< 15%
1.05 x Setting +/-5%
Setting +/- 5%
0.95 x Setting +/-5%
+/- 5% or 60 ms, whichever is greater (1.05 – <2) Is
+/- 5% or 40 ms, whichever is greater (2 – 20) Is
P24xM
P24xM-TM-EN-2.1