GE Multilin 350 Series

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–97
Figure 31: Neutral Overvoltage logic diagram
Calculated Neutral
Voltage V0
SETPOINTS
SETPOINT
NTRL OV FUNCTION: Disabled = 0
Latched Alarm
NTRL OV PICKUP:
AND
Operate Output Relay 1 (TRIP)
Event Recorder
LED: TRIP
Alarm
OR
OR
AND
SETPOINTS:
Operate
output relays
upon
selection
OUTPUT RELAY 4 OUTPUT RELAY 5 OUTPUT RELAY 6 OUTPUT RELAY 3
Trip
AND
Trip
(To Breaker Failure)
SETPOINTS
BLOCK 1: Off=0 BLOCK 2: Off=0 BLOCK 3: Off=0
OR
RUN
Vn = 3V0
LED: PICKUP
Neutrl OV Trip (Alarm) - PKP,OP
Message
3V0 > PICKUP
NTRL OV DELAY:
SETPOINT
t
PKP
LED: ALARM
RESET
Command
AND
S
R
LATCH
898015A1.cdr
Courtesy of NationalSwitchgear.com