Ground leakage current interrupter

Details Ground leakage current interrupter Ground leakage current interrupter

1978-05-15

1980-04-29

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361110, H02H 328

Patent

active

042008972

ABSTRACT:
A ground leakage current interrupter circuit including a transformer having a pair of balanced differential primary windings and a secondary winding, a fault detector for monitoring the output of the secondary winding and producing a fault signal in response to increases in the level of the secondary winding output that occur at greater than a predetermined rate, and a circuit interrupter responsive to the fault signal produced by the fault detector. Preferably, the fault detector includes a level detector for producing the fault signal in response to secondary winding output levels greater than a reference signal level, and a reference supply that varies the reference signal level in dependence upon the level of the secondary winding output so as to prevent production of a fault signal in response to increases in the secondary winding output that occur at less than the predetermined rate.

REFERENCES:
patent: 3736468 (1973-05-01), Reeves et al.
patent: 3914667 (1975-10-01), Waldron
patent: 4024435 (1977-05-01), Gross
patent: 4138707 (1979-02-01), Gross

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