CHAPTER 8: CONTROL BREAKER FAILURE (50BF)
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 8–31
PHASE LOWSET PICKUP
Range: 0.050 to 30.000 x CT in steps of 0.001 x CT
Default: 1.000 x CT
The setpoint specifies the phase current output supervision level. The setting detects the
lowest expected fault current on the protected circuit where significant change in
current level is expected (for example: breakers with opening resistors).
NEUTRAL LOWSET PICKUP
Range: 0.050 to 30.000 x CT in steps of 0.001 x CT
Default: 1.000 x CT
The setpoint specifies the neutral current output supervision level. The setting detects
the lowest expected fault current on the protected circuit where significant change in
current level is expected (for example: breakers with opening resistors). Neutral current
supervision is used to provide increased sensitivity.
DROPOUT DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 0.100 s
The setting is used to set the period of time for which the Breaker Fail output is sealed-in.
This timer must be coordinated with the automatic reclosing scheme of the failed
breaker, to which the Breaker Failure element sends a cancel reclosure signal. Reclosure
of a remote breaker can also be prevented by holding a transfer Trip signal on for longer
than the reclaim time.
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
OUTPUT RELAY X
For details see Common Setpoints
.
EVENTS
Range: Disabled, Enabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Self-reset
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