GE 350-A9

6–136 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S4 CONTROLS CHAPTER 6: SETPOINTS
Figure 6-59: 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
Do Not Operate, Operate
OUTPUT RELAY X
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 DELAY 1
SETPOINT
t
PKP
RUN
BF TIME DELAY 2
SETPOINT
t
PKP
RUN
Breaker Failure
Message
LED: ALARM
RESET
Command
AND
S R
LATCH
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