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

G - Physics

01

R

324/58.4

G01R 19/00 (2006.01) G01R 31/00 (2006.01)

Patent

CA 1183898

FAULT INDICATOR HAVING INCREASED SENSITIVITY TO FAULT CURRENTS Edmund O. Schweitzer, Jr. Abstract of the Disclosure 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 communi- cation with the conductor. The reed switches are electri- cally connected in parallel by a magnetically conductive bridging element at one end of the pair and by a non-magneti- cally 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.

377525

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