G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 31/00 (2006.01) H02B 13/025 (2006.01) H02H 1/00 (2006.01) H02J 13/00 (2006.01)
Patent
CA 2417693
Arcing faults in an electric power system are detected by sensors powered by the light generated by the arcing even in the presence of background light. The sensors have one or more first photovoltaic cells energized by light passed through a first filter having a passband which includes a characteristic wavelength of the arcing material to generate a sensed light electrical signal. One or more second photovoltaic cells are energized by light filtered by a second filter having a passband not including the characteristic wavelength to generate a background light electrical signal. These two electrical signals are applied in opposition to an LED which is turned on when arcing is present. The light signal from the LED is transmitted through an optic fiber to a photoelectric circuit, which generates an arcing signal when energized. The LED may be biased toward the on condition by unfiltered additional photovoltaic cells.
Bereskin & Parr
Corporation Eaton
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