Ground fault protection system

Details Ground fault protection system Ground fault protection system

1988-02-11

1989-09-26

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 47, 361 49, H02H 316, H02H 332

Patent

active

048705276

ABSTRACT:
A ground fault detector employs a current feedback loop which makes use of a differential current sensing configuration to in essence increase the gain of the current feedback signal, thereby lowering the detector trip level when ground fault currents are present. In a preferred embodiment, ground faults are detected in a circuit having an AC-to-AC converter and a useful load by positioning a differential sensing configuration in the DC link of the AC-to-AC converter.

REFERENCES:
patent: 1866751 (1932-07-01), Butow
patent: 4053815 (1977-10-01), Sircom
patent: 4080640 (1978-03-01), Elms et al.
patent: 4159499 (1979-06-01), Bereskin
patent: 4287545 (1981-09-01), Mayer
patent: 4320444 (1982-03-01), Hausler et al.
patent: 4683513 (1987-07-01), Miller

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