GE Multilin 350 Series

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–67
Figure 17: 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:
AND
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:
Operate
output relays
upon
selection
OUTPUT RELAY 4 OUTPUT RELAY 5 OUTPUT RELAY 6 OUTPUT RELAY 3
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 AOP
Phase IOC
BOP
Phase IOC COP
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
898009.cdr
Courtesy of NationalSwitchgear.com