GE 350-A9 - Page 172

6–42 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-17: Phase time overcurrent protection logic diagram
SETPOINTS
Phase A current (IA)
SETPOINT
PH TOC FUNCTION: Disabled = 0
Latched Alarm
PH TOC PICKUP: PH TOC CURVE: PH TOC TDM:
AND
Phase B current (IB) Phase C current (IC)
OR
Operate Output Relay 1 (TRIP)
Event Recorder
Transient Recorder
LED: PICKUP
LED: TRIP
OR
Event Recorder
Transient Recorder
Alarm
OR
OR
Cold Load PKP
Phase Currents
Adjust Phase TOC PKP
AND
SETPOINTS:
Do Not Operate, Operate
OUTPUT RELAY X
Trip
AND
Trip (To Breaker Failure)
PH TOC PH A OP PH TOC PH B OP
PH TOC PH C OP
Message
:
PH TOC OP
PH TOC PH A PKP PH TOC PH B PKP
PH TOC PH C PKP
PH TOC PKP
PH TOC RESET TIME: RUN IA > PICKUP RUN IB > PICKUP RUN IC > PICKUP
Adjust PKP Adjust PKP Adjust PKP
SETPOINTS
BLOCK 1: Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
OR
Autoreclose
(per shot settings)
LED: ALARM
RESET
Command
AND
S R
LATCH
898010A2.cdr
Block TOC Dir Phase A
From TOC PHASE DIRECTIONAL
Block TOC Dir Phase B Block TOC Dir Phase C
AND
AND AND