Electrical noise detector for detecting power line gap defects
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United States of America Patent
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-
Mar 15, 1988
Grant Date -
N/A
app pub date -
Nov 14, 1985
filing date -
Nov 14, 1985
priority date (Note) -
Expired
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Abstract
Apparatus for detecting gap-type defects in power line equipment in response to broadband radio frequency noise generated by such faults. The apparatus includes a radio receiver coupled to an antenna to receive the noise and provide first signals responsive thereto. Squelch circuitry attenuates the first signals below a predetermined magnitude and outputs second signals responsive to first signals which exceed the predetermined magnitude. Sample and hold circuitry provides third signals in response to the second signals, i.e. in the time periods in which the second signals are not squelched. Filter circuitry separates gap noise from other local noise by determining the periodicity of the third signals, providing fourth signals in response to third signals having a predetermined repetitive rate. Indicator circuitry responsive to the fourth signals identifies the times in which periodic noise indicative of gap-type noise is detected.
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