Earth leakage protection device and electrical switchgear...

Details Earth leakage protection device and electrical switchgear... Earth leakage protection device and electrical switchgear...

2006-03-07

2006-03-07

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

Reexamination Certificate

active

07009825

ABSTRACT:
The earth leakage protection device comprises an input designed to be connected to a measuring toroid, a comparator to compare a signal representative of an earth leakage current with a reference threshold, and a processing circuit to command a trip relay for opening main contacts when an earth leakage fault is detected. The device also comprises a signal rectifier receiving at least one signal representative of an earth leakage current, and a filter connected to the rectifier to supply a filtered rectified signal to said comparison means. The electrical switchgear unit comprises main conductors and contacts connected in series, the measuring toroid of the earth leakage current, the relay, and an earth leakage protection device with a matching filter connected to the toroid and to the trip relay.

REFERENCES:
patent: 4318151 (1982-03-01), Balchin
patent: 4370692 (1983-01-01), Wellman et al.
patent: 5642427 (1997-06-01), Katz et al.
patent: 0 039 280 (1981-11-01), None

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