Apparatus for and method of detecting high impedance faults on d

Details Apparatus for and method of detecting high impedance faults on d Apparatus for and method of detecting high impedance faults on d

1979-10-29

1981-10-27

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, 361 93, H02H 316

Patent

active

042977380

ABSTRACT:
A technique for detecting high impedance faults on distribution circuits with delta connected loads is disclosed herein. This technique bases its detection on the status of the third harmonic component in each of the three-phase line currents of the distribution circuit and specifically on a predetermined minimum increase in the amplitude of any one of these components over a continuous predetermined period, whereby to discriminate between a true high impedance fault and a transient disturbance.

REFERENCES:
patent: 3308345 (1967-03-01), Warrington
patent: 3515943 (1970-06-01), Warrington
patent: 4196463 (1980-04-01), Dickerson

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