Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1978-02-13
1979-08-21
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
324127, 361143, G01R 3102
Patent
active
041655281
ABSTRACT:
A fault indicator for alternating current distribution systems includes a pair of spaced pole pieces for receiving therebetween at one end the conductor and at the other end a pivoted permanent magnet carrying a target that is biased to a fault indicating position by a stationary permanent magnet. The pole pieces are demagnetized on flow of fault current in the conductor. They are remagnetized by a winding which is energized by discharge of a capacitor that is charged through a rectifier from an oscillator circuit. The winding is carried by a receptacle into which the other ends of the pole pieces are inserted and a circuit is completed thereby to charge the capacitor. The receptacle is carried at one end of a tubular housing the other end of which has an eye to receive a claw of a live line tool for applying the fault indicator to and removing it from the conductor.
REFERENCES:
patent: 3375510 (1968-03-01), Pitches
patent: 3426275 (1969-02-01), Schweitzer, Jr.
patent: 3991366 (1976-11-01), Schweitzer, Jr.
patent: 4045726 (1977-08-01), Schweitzer, Jr.
Miller J. D.
Schroeder L. C.
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