Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
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
Electric Power Research Institute Inc.
Moose Jr. Harry E.
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