Negative Sequence Overcurrent Protection; Npsoc Directional Parameters; Circuit Breaker Fail And Undercurrent Protection; Broken Conductor Protection - GE P4A Technical Manual

P54A/B/C/E
3.8

NEGATIVE SEQUENCE OVERCURRENT PROTECTION

IDMT pick-up
DT pick-up
Drop-off (IDMT and DT)
IDMT operate
DT operate
DT Reset
3.8.1

NPSOC DIRECTIONAL PARAMETERS

Directional boundary pick-up (RCA +/-90%)
Directional boundary hysteresis
Directional boundary repeatability
3.9

CIRCUIT BREAKER FAIL AND UNDERCURRENT PROTECTION

I< Pick-up
I< Drop-off
Operate time
Timers
Reset time
3.10

BROKEN CONDUCTOR PROTECTION

Pick-up
Drop-off
DT operate
Reset time
3.11

THERMAL OVERLOAD PROTECTION

Thermal alarm pick-up
Thermal overload pick-up
Cooling time accuracy
Repeatability
Note:
Operating time measured with applied current of 20% above thermal setting.
P54xMED-TM-EN-1
Chapter 22 - Technical Specifications
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%
+/-2°
< 1°
< 1%
Setting +/- 10% or 0.025 In, whichever is greater
Setting +/- 5% or 20 mA, whichever is greater
< 12 ms
+/- 2% or 20 ms, whichever is greater
< 15 ms
Setting +/- 2.5%
0.95 x Setting +/- 2.5%
+/- 2% or 40 ms, whichever is greater
<25 ms
Calculated trip time +/- 10%
Calculated trip time +/- 10%
+/- 15% of theoretical
<5%
515