Apparatus and method for optically detecting arcing faults...

Details Apparatus and method for optically detecting arcing faults... Apparatus and method for optically detecting arcing faults...

G - Physics

01

R

G01R 31/02 (2006.01) H01H 83/00 (2006.01) H02H 1/00 (2006.01)

Patent

CA 2315513

Arcing faults in electric power systems, such as switchgear, are detected by gathering light from components in the system and splitting the gathered light into two beams. The first beam is passed through a first narrow band filter to extract a wavelength characteristic of arcing in the material of the selected component, such as the copper in the switchgear conductors. The second beam is passed through a second filter having a narrow bandwidth, not including the characteristic wavelength. The extracted light signals are converted to a sensed light electrical signal and a background light electrical signal, respectively, by photodiodes and compared. If the sensed light electrical signal exceeds the background light electrical signal by a selected threshold, an output device such as a trip solenoid is actuated.

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