Detector for monitoring the integrity of a ground connection to

Details Detector for monitoring the integrity of a ground connection to Detector for monitoring the integrity of a ground connection to

1995-05-08

1997-02-25

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 86, H02H 316

Patent

active

056064802

ABSTRACT:
A detector for monitoring the integrity of a ground connection to an electrical appliance having live and neutral terminals for feeding current to the appliance from respective live and neutral feeders of an electrical supply having a ground point for connecting to the ground terminal of the appliance. The detector comprises a differential comparator circuit for comparing a voltage at the neutral connection with a voltage at the ground terminal of the appliance and producing a fault signal if a difference therebetween exceeds a predetermined threshold. A normally closed switching device is connected in at least one of the live and neutral connections so as to be opened by a relay operatively coupled to the detector and responsive to the fault signal produced thereby.

REFERENCES:
patent: 3863238 (1975-01-01), Rowell
patent: 4707759 (1987-11-01), Bodkin
patent: 4709164 (1987-11-01), Giesl
patent: 4933801 (1990-06-01), Glennon et al.
patent: 5051732 (1991-09-01), Robitaille
patent: 5485340 (1996-01-01), Avitan

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