Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1975-12-12
1977-07-05
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 87, H02H 328
Patent
active
040342670
ABSTRACT:
Self-powered apparatus for indicating the existence of a fault in any of a plurality of conductors in an multiconductor electrical distribution system. The plurality of conductors pass through the window of a closed loop core structure current transformer, and the current transformer has a power output and a signal output. The power output is connected to, and drives, fault indicating means and starting means. The starting means initiate operation of control signal translation means which are connected to the current transformer signal output. Also included are transmission means connected to the control signal translation means and to prevention means incorporated within the indicating means, and the transmission means transmit the control signal from the signal translation means to the prevention means. The indicating means are responsive to operation of the prevention means, such that only when the control signal is transmitted to the prevention means will the indicating means be allowed to operate. The entire apparatus is powered only during the existence of a fault, and derives its power by the fault's causing current to flow within the current transformer. The apparatus may also be utilized in a current-monitoring function for a single conductor.
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patent: 3959695 (1976-05-01), Shimp
Miller J D
Salce Patrick R.
Westinghouse Electric Corporation
Yatsko M. S.
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