GE Multilin 350 Series

6–72 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 19: Ground/Sensitive Ground instantaneous overcurrent protection logic
diagram
SETPOINT
Ground/Sens. Ground current (Ig)
RUN
SETPOINT
BLOCK 1: Off=0
GND IOC PICKUP:
Ig > PICKUP
BLOCK 2: Off=0 BLOCK 3: Off=0
OR
AND
Operate Output Relay 1 (TRIP)
Event Recorder
Transient Recorder
LED: TRIP
OR
OR
Cold Load PKP
From Ground CT or
,
From Sens. Ground CT
Block Inputs
AND
SETPOINT:
Operate
output relays
upon
selection
OUTPUT RELAY 4 OUTPUT RELAY 5 OUTPUT RELAY 6 OUTPUT RELAY 3
AND
Trip
(To Breaker Failure)
SETPOINT
GND IOC FUNCTION: Disabled = 0
Latched Alarm Alarm
Trip
GND IOC PKP
DELAY:
SETPOINT
t
PKP
0
Event Recorder
Transient Recorder
Autoreclose
(per shot settings)
LED: ALARM
RESET
Command
AND
S
R
LATCH
LED: PICKUP
Ground IOC PKP
Message:
Ground IOC OP
898005.cdr
Courtesy of NationalSwitchgear.com