Protective relay circuit for detecting arcing faults on low-volt

Details Protective relay circuit for detecting arcing faults on low-volt Protective relay circuit for detecting arcing faults on low-volt

1984-05-15

1987-01-27

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 86, 361 88, 361113, H02H 322

Patent

active

046398171

ABSTRACT:
A protective relay for detecting power arcing faults on a low-voltage spot network. The protective relay can monitor the voltage difference between each phase conductor, the voltage difference between each phase conductor and the neutral conductor, or the current on each phase conductor. Using one of these three sets of values, the protective relay first filters the input signal so that only frequencies indicative of a power arcing fault on the low-voltage spot network are analyzed. The signals passed by the filter are amplified, rectified, and averaged and the peak of each signal detected. If the peak has a duration longer than a predetermined value, a fault indication is provided.

REFERENCES:
patent: 3192442 (1965-06-01), Warrington et al.
patent: 3887915 (1975-06-01), Olsen et al.
patent: 3970897 (1976-07-01), Tamir et al.
patent: 4333050 (1982-06-01), Yeasting
patent: 4409636 (1983-10-01), Brandt et al.

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