Electrical noise detector for detecting power line gap defects

Details Electrical noise detector for detecting power line gap defects Electrical noise detector for detecting power line gap defects

1985-11-14

1988-03-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324 57N, 324556, 455226, G01R 3108, G01R 3112

Patent

active

047315865

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.

REFERENCES:
patent: 3551804 (1970-12-01), Weddle
patent: 3820018 (1974-06-01), Beasley et al.
patent: 3922608 (1975-11-01), Denny
patent: 4072899 (1978-02-01), Shimp
patent: 4342960 (1982-08-01), Sawada
patent: 4360928 (1982-11-01), Camplell
patent: 4577151 (1986-03-01), Tanisaka et al.
patent: 4627103 (1986-12-01), Fukuhara
patent: 4647845 (1987-03-01), Richter et al.

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