GE 350-A9 - Page 174

6–44 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 6-18: Phase instantaneous overcurrent protection logic diagram
SETPOINT
Phase A current (IA)
RUN
SETPOINT
PH IOC FUNCTION: Disabled = 0
Latched Alarm
PH IOC PICKUP:
PH IOC PKP DELAY:
Phase B current (IB) Phase C current (IC)
RUN RUN
Operate Output Relay 1 (TRIP)
Event Recorder
Transient Recorder
LED: PICKUP
LED: TRIP
Event Recorder
Transient Recorder
Alarm
OR
OR
Cold Load PKP
Autoreclose
(per shot settings)
Phase Currents
Block Inputs
AND
SETPOINT:
Do Not Operate, Operate
OUTPUT RELAY X
Trip
AND
SETPOINT
BLOCK 1: Off = 0 BLOCK 2: Off = 0 BLOCK 3: Off = 0
OR
Message
Phase IOC OP
IB > PICKUP IA > PICKUP
IC > PICKUP
SETPOINT
Phase IOC A OP Phase IOC B OP
Phase IOC C OP
Phase IOC A PKP
Phase IOC B PKP
Phase IOC C PKP
Phase IOC PKP
Message
t
PKP
0
t
PKP
0
t
PKP
0
OR
OR
Trip (To Breaker Failure)
LED: ALARM
RESET
Command
AND
S R
LATCH
898009A2.cdr
AND
Block TOC Dir Phase A
From TOC PHASE DIRECTIONAL
Block TOC Dir Phase B Block TOC Dir Phase C
AND
AND AN
D