Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – With electric power receptacle for line wire testing
Patent
1990-09-21
1991-11-12
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
With electric power receptacle for line wire testing
324122, 324133, 340650, 361 42, G01R 3100
Patent
active
050651048
ABSTRACT:
A ground fault detector has a neon bulb connected between a rectangular copper plate connected to an antenna wire and a resistor connected to one arm of a double-pole double-throw relay with the stationary contacts cross coupled to hot and neutral wires of a three-wire A.C. line. A photocell detector is optically coupled to the neon bulb and provides a signal to a live wire detector circuit when the neon bulb is illuminated to disable operation of the relay. A timer circuit causes the live wire detector circuit to operate the relay when the neon bulb is not illuminated after a predetermined time. A network is photo-optically coupled to a ground status detector that controls a contactor that selectively connects power to the equipment being monitored. The junction of a Y network is also coupled to the input of the ground status detector. The input of the photo-optical coupler is connected between a leg of the Y circuit and the enclosure of the equipment being monitored. Another leg of the Y network is connected to the enclosure of the equipment being monitored.
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Kusko Alexander
Medora Noshirwan K.
Kusko Alexander
Mueller Robert W.
Wieder Kenneth A.
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