GE Multilin 350 Series

CHAPTER 6: SETPOINTS S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–129
Figure 45: Breaker failure logic diagram
SETPOINT
Phase A current (Ia)
SETPOINT
BF FUNCTION: Disabled = 0
Latched Alarm
BF CURRENT:
Phase B current (Ib) Phase C current (Ic)
Event Recorder
Transient Recorder
Alarm
OR
OR
Trip
Phase Currents
AND
SETPOINT
Operate
output relays
upon
selection
OUTPUT RELAY 4 OUTPUT RELAY 5 OUTPUT RELAY 6 OUTPUT RELAY 3
Ib > PICKUP
Ia > PICKUP
Ic > PICKUP
OR
AND
SETPOINT
BF EXT INITIATE Off=0 Range: Contact Input,
Virtual Input, Remote Input,
Logic Element
From Protection operation
OR
BF TIME DELAY1
SETPOINT
t
PKP
RUN
BF TIME DELA
Y2
SETPOINT
t
PKP
RUN
Breaker Failure
Message
LED: ALARM
RESET
Command
AND
S
R
LATCH
898001.cdr
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