Wattmetric Zero-Sequence Directional Ground Fault - GE D90 Plus Instruction Manual

GROUPED PROTECTION ELEMENTS

Wattmetric zero-sequence directional ground fault

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Figure 195: Breaker failure three-pole logic, sheet 2 of 3
Figure 196: Breaker failure three-pole logic, sheet 3 of 3
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 may be used to sense either forward or reverse ground faults in
either 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 item to open
the wattmetric zero-sequence directional ground fault configuration window.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION