Fault indicator having trip inhibit circuit

Details Fault indicator having trip inhibit circuit Fault indicator having trip inhibit circuit

1983-07-29

1987-08-11

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

324127, 324133, G08B 2100

Patent

active

046865187

ABSTRACT:
A fault indicator includes a status indicator for indicating normal and fault conditions on a monitored conductor. Trip circuitry within the fault indicator conditions the status indicator from a normal-indicating to a fault-indicating state upon the occurrence of a fault current in the conductor. Trip inhibit circuitry, including a loss of voltage sensor, inhibits the trip circuitry following a power failure whereby the fault indicator is rendered insensitive to inrush current during a period immediately following restoration of power to the system.

REFERENCES:
patent: 1871787 (1932-08-01), Goldsborough
patent: 2551022 (1951-05-01), Lerstrup
patent: 3496417 (1970-02-01), Tenenbaum
patent: 3733595 (1973-05-01), Benedict
patent: 4007456 (1977-02-01), Paige et al.
patent: 4063171 (1977-12-01), Schweitzer, Jr.
patent: 4153924 (1979-05-01), Moran
patent: 4251770 (1981-02-01), Schweitzer, Jr.
patent: 4263550 (1981-04-01), Schweitzer, Jr.
patent: 4345242 (1982-08-01), Ienna-Balistreri

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