Fault indicator having delayed trip circuit

Details Fault indicator having delayed trip circuit Fault indicator having delayed trip circuit

1987-04-24

1989-01-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

With electric power receptacle for line wire testing

324543, G01R 3102

Patent

active

047959827

ABSTRACT:
A reset coordinated fault indicator for indicating the occurrence of a fault current in a monitored conductor includes an electrically actuated indicator flag. A trip circuit within the fault indicator impulses the indicator flag from a normal reset-indicating state to a fault-indicating state following the occurrence of a fault current in the conductor. A reset circuit periodically impulses the indicator flag to the reset-indicating state upon restoration of power to the conductor. To preclude simultaneous actuation of the trip and reset circuits and consequent failure of the indicator flag to register a fault, the trip circuit, upon the occurrence of a fault, first actuates the reset circuit to render the reset circuit inoperative, and then actuates the indicator flag to provide a fault indication.

REFERENCES:
patent: 4063171 (1977-12-01), Schweitzer, Jr.
patent: 4234847 (1980-11-01), Schweitzer, Jr.
patent: 4251770 (1981-02-01), Schweitzer, Jr.
patent: 4263550 (1981-04-01), Schweitzer, Jr.
patent: 4438403 (1984-03-01), Schweitzer, Jr.
patent: 4458198 (1984-07-01), Schweitzer, Jr.

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