Residual current detector

Details Residual current detector Residual current detector

1986-04-28

1988-02-16

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 46, 361 47, H02H 316

Patent

active

047259132

ABSTRACT:
A residual current detector capable of detecting an earth leakage current, e.g. for use in a circuit breaker, includes a toroidal core through which passes the live and neutral wires of an electrical installation, to form the primary windings of a differential transformer. At least one secondary winding is wound on to the core and driven with an alternating voltage by a generator. A phase sensitive detector identifies a residual current by detecting the change in phase of the voltage across the at least one secondary winding. The secondary winding may comprise two coils, a first coil driven by the generator and a second coil adapted to pick up an induced voltage from the toroidal core. The phase sensitive detector, which may form part of a phase locked loop, compares the phase of the signal from the second coil with that of the alternating voltage of the generator.

REFERENCES:
patent: 3801871 (1974-04-01), Loh
patent: 3895263 (1975-07-01), Clark
patent: 3932790 (1976-01-01), Muchmick
patent: 3978400 (1976-08-01), Pettit
patent: 4068276 (1978-01-01), Pirrtell
patent: 4080640 (1978-03-01), Elms et al.
patent: 4228475 (1980-10-01), Sherwood
patent: 4233640 (1980-11-01), Klein et al.

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