GE D90 Plus - Wattmetric Zero-Sequence Directional Ground Fault

CHAPTER 7: PROTECTION GROUPED PROTECTION ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 287
Figure 247: Breaker failure three-pole logic, sheet 2 of 3
Figure 248: Breaker failure three-pole logic, sheet 3 of 3
Wattmetric zero-sequence directional ground fault
The wattmetric zero-sequence directional element responds to power derived from zero-
sequence voltage and current in a direction specified by the element characteristic angle.
The angle can be set within all four quadrants and the power can be active or reactive.
Therefore, the element can be used to sense either forward or reverse ground faults in
inductive, capacitive, or resistive networks. The inverse time characteristic allows time
coordination of elements across the network.
Typical applications include ground fault protection in solidly grounded transmission
networks, grounded/ungrounded/resistor-grounded/resonant-grounded distribution
networks, or for directionalizing other non-directional ground elements.
Select the Settings > Protection > Elements > Group 1 > Wattmetric menu to open the
wattmetric zero-sequence directional ground fault configuration window.
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