GE 350-A9

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–77
Figure 6-33: Phase Overvoltage logic diagram
Phase Voltage Inputs
(associated setpoints)
SETPOINTS
Vab
SETPOINT
PH OV FUNCTION: Disabled = 0
Latched Alarm
PH OV PICKUP:
AND
Vbc Vca
Operate Output Relay 1 (TRIP)
Event Recorder
Transient 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 RUN RUN
Van Vbn
Vcn
None
DeltaWye
LED: PICKUP
Event Recorder
Transient Recorder
Phase Overvoltage
Message
Va > PICKUP
Vb > PICKUP
Vc > PICKUP
All Three
Operate for
programmed
combination
Any Two
Any One
SETPOINT
PH OV PHASES:
OR
PHASE OV DELAY:
SETPOINT
t
PKP
LED: ALARM
RESET
Command
AND
S R
LATCH
898013A1.cdr