Fault indicator having increased sensitivity to fault currents

Details Fault indicator having increased sensitivity to fault currents Fault indicator having increased sensitivity to fault currents

1982-08-12

1984-01-03

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

324133, G08B 2100

Patent

active

044245122

ABSTRACT:
A fault indicator for indicating the occurrence of a fault current in an alternating current conductor includes a pair of parallel-spaced reed switches in magnetic communication with the conductor. The reed siwtches are electrically connected in parallel by a magnetically conductive bridging element at one end of the pair and by a non-magnetically conductive bridging element at the other end of the pair. A permanent magnet bridging the non-magnetic bridge establishes a magnetic bias circuit which extends serially through the switches to increase the sensitivity of each switch to a fault current during a respective half-cycle of the alternating current cycle.

REFERENCES:
patent: 3708724 (1973-01-01), Schweitzer, Jr.
patent: 3906477 (1975-09-01), Schweitzer, Jr.
patent: 3991366 (1976-11-01), Schweitzer, Jr.
patent: 4045726 (1977-08-01), Schweitzer, Jr.
patent: 4086529 (1978-04-01), Schweitzer, Jr.
patent: 4234847 (1980-11-01), Schweitzer, Jr.

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