CHAPTER 7: MONITORING TRANSIENT GROUND FAULT DETECTION
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–43
Path: Setpoints > Monitoring > Harmonic Detection > Harmonic Detection 1(X)
FUNCTION
Range: Disabled, Alarm, Latched Alarm, Configurable
Default: Disabled
VT INPUT
Range: dependant upon the order code
Default: Ph VT Bank 1–J2
CT INPUT
Range: dependant upon the order code
Default: CT Bank 1–J1
POWER THRESHOLD
Range: 0.00 to 100.00 W in steps of 0.01
Default: 3.00 W
The Ground Power Threshold is used to determine the residual fault direction. To avoid
overlap with the "small P/Q" area, minimum value is 3 W.
RESIDUAL VOLTAGE SUPERVISION
Range: 0.00 to 1.50 x VT in steps of 0.01
Default: 0.12 x VT
The Voltage Supervision pickup threshold is used to determine whether TGFD starts. 10%
of the nominal voltage is used, which is 120 x 10%=12V (i.e. 0.12 x VT) as the residual
overvoltage threshold, since the VT tolerance is 2%-5% and this range needs to be
avoided.
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
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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