Ground-fault protective relay

Details Ground-fault protective relay Ground-fault protective relay

1984-07-10

1986-01-21

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 47, H02H 316

Patent

active

045660530

ABSTRACT:
A protective relay for providing an infinitely variable family of curves for use in ground-fault protection. In one embodiment, the protective relay includes a saturable reactor across the output terminals thereof. The saturable reactor impedance varies in accord with the load or fault current such that a trip characteristic based on the zero sequence current and the load or fault current is obtained. The trip characteristic is selected by a potentiometer that limits the amount of dc current to the saturable reactor. Once established by setting the potentiometer, the trip characteristic defines the amount of 3I.sub.O neutral current, as a function of three-phase current, necessary to operate the protective relay. Varying the potentiometer setting provides the infinite family of curves.

REFERENCES:
patent: 2619522 (1952-11-01), Glassburn
patent: 4297740 (1981-10-01), Hagberg
patent: 4347542 (1982-08-01), Calhoun
patent: 4357644 (1982-11-01), Schmidt
patent: 4363066 (1982-12-01), Bishop

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