GE Multilin 350 Series

CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–99
Figure 32: Negative Sequence Overvoltage logic diagram
Calculated Negative
Sequence Voltage
SETPOINTS
SETPOINT
NEG SEQ OV FUNCTN: Disabled = 0
Latched Alarm
NEG SEQ 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
V_2
Phase VT connection
Delta
Wye
LED: PICKUP
NegSeq Overvoltage
Message
V_2 or
Ö3*V_2 > PICKUP
NEG SEQ OV DELAY:
SETPOINT
t
PKP
Ö3 * V_2
LED: ALARM
RESET
Command
AND
S
R
LATCH
898016A1.cdr
Courtesy of NationalSwitchgear.com