GE 339

6–72 339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-29: 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
Phase Currents
AND
SETPOINTS:
OUTPUT RELAY X
Do Not Operate, Operate
Trip
AND
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
SETPOINTS
BLOCK 1: Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
OR
LED: ALARM
RESET
Command
AND
S R
LATCH
896010A1.cdr
Block TOC Dir Phase A
From TOC PHASE DIRECTIONAL
Block TOC Dir Phase B Block TOC Dir Phase C
AND
AND AND