Method for diagnosing an insulation deterioration of a power cab

Details Method for diagnosing an insulation deterioration of a power cab Method for diagnosing an insulation deterioration of a power cab

1986-02-27

1988-01-26

Strecker, Gerard R.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324520, 324551, G01R 3102

Patent

active

047219165

ABSTRACT:
A method for diagnosing an insulation deterioration of a power cable comprising a step of measuring a DC current component in the AC voltage applied to said power cable, by using a filter circuit for cutting off an AC current and a DC current measuring apparatus for measuring small magnitude of DC current. According to the present invention, said filter circuit and said DC current measuring apparatus are joined in parallel each other and connected between a power source and one end portion of said power cable to be diagnosed. The DC current measuring apparatus can detect the polarity, magnitude, and time lapse characteristics of said DC current component for analyzing and estimating the insulation deterioration.

REFERENCES:
patent: 2077357 (1937-04-01), Doolittle
patent: 3178640 (1965-04-01), Jaster et al.
patent: 3211998 (1965-10-01), Kidwell
patent: 3803484 (1974-04-01), Gray
patent: 3821640 (1974-06-01), Bahder et al.
patent: 4200835 (1980-04-01), Anahara et al.
patent: 4200836 (1980-04-01), Okada et al.
patent: 4206398 (1980-06-01), Janning
patent: 4415850 (1983-11-01), Sherwood

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