GE 350-A9

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–79
Figure 6-34: 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:
Do Not Operate, Operate OUTPUT RELAY X
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
898015A2.cdr