Protective relay apparatus and method for providing single-pole

Details Protective relay apparatus and method for providing single-pole Protective relay apparatus and method for providing single-pole

1983-08-29

1985-08-20

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 86, H02H 316

Patent

active

045368155

ABSTRACT:
An apparatus and method for detecting a single-phase-to-ground fault on a three-phase electrical power system and for identifying the faulted phase conductor. Each phase conductor is monitored by evaluating three phasor signals associated therewith, i.e., the zero sequence current of the electrical power system, the negative sequence voltage on the phase conductor rotated 90 electrical degrees counterclockwise (or the negative sequence current on the phase conductor), and the quadrature phase voltage for the phase conductor rotated 30 electrical degrees counterclockwise. The coincidence of these three signals for a predetermined time indicates the occurrence of a single-phase-to-ground fault on the monitored phase conductor.

REFERENCES:
patent: 3154737 (1964-10-01), Hodges
patent: 4398232 (1983-08-01), Elmore

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