4–290 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
MONITORING CHAPTER 4: SETPOINTS
the magnitude of the fundamental magnitude on one of remaining two phases drops
below the cut-off level. In this case the selected harmonic on this phase is dropped from
summation, and the divider is decreased to 1.
MIN OPER CURRENT
Range: 0.03 to 1.00 x CT in steps of 0.01
Default: 0.10 x CT
This setting sets the minimum value of current required to allow the Harmonic Detection
element to operate.
If PHASES FOR OPERATION is set to AVERAGE, the average of three-phase currents is
used for supervision. A similar adaptive average algorithm is applied to calculate the
average of operation current magnitude.
OUTPUT RELAY X
For details see Common Setpoints
.
EVENTS
Range: Disabled, Enabled
Default: Enabled
TARGETS
Range: Self-reset, Latched, Disabled
Default: Self-reset
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