GE Multilin 345 - Page 178

6–62 345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-26: 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
LED: PICKUP
OR
Alarm
OR
OR
CT(W1) CT(W2) phase
currents selected under
PH TOC INPUT setpoint
AND
Trip
AND
PH TOC PH A OP PH TOC PH B OP
PH TOC PH C OP
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
LED: TRIP
To Breaker Failure
Trip
SETPOINTS
(configurable only if “TRIP”
function selected)
Operate trip output relays upon selection
RLY2 TRIP W2 BKR RLY1 TRIP W1 BKR
SETPOINTS:
Do Not Operate, Operate
OUTPUT RELAY X
Message and Event Recorder
Message and Event Recorder
PH TOC INPUT:
897808A1.cdr