Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Using radiant energy
Patent
1993-01-21
1994-11-15
Snow, Walter E.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Using radiant energy
324509, 324512, 324539, 324 96, G01R 3108
Patent
active
053651758
ABSTRACT:
The present invention discloses a method of detecting and locating current imbalances such as ground faults in multiwire systems using the Faraday effect. As an example, for 2-wire or 3-wire (1 ground wire) electrical systems, light is transmitted along an optical path which is exposed to magnetic fields produced by currents flowing in the hot and neutral wires. The rotations produced by these two magnetic fields cancel each other, therefore light on the optical path does not read the effect of either. However, when a ground fault occurs, the optical path is exposed to a net Faraday effect rotation due to the current imbalance thereby exposing the ground fault.
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Cull Ronald C.
Patterson Richard L.
Rose Allen H.
Brown Glenn W.
Miller Guy M.
Shook Gene E.
Snow Walter E.
The United States of America as represented by the Administrator
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