GE Multilin 350 Series

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–95
Figure 30: 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:
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 RUN RUN
Van Vbn
Vcn
None
Delta
Wye
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
898013.cdr
Courtesy of NationalSwitchgear.com