Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1987-10-02
1989-09-12
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324 71, G01R 3102
Patent
active
048663930
ABSTRACT:
A method of diagnosing the deterioration of a zinc oxide type lighting arrester having one or more series-connected non-linear resistance elements including steps of elimination of the effects of capacitive currents from phase currents; obtaining a synthesized waveform using a window type transformer based on the resistance elements alone; and diagnosing the presence of a deteriorated non-linear resistance element by generating a first pulse voltage when the maximum crest value of the synthesized waveforms exceeds a predetermined value, generating a second pulse voltage representative of terminal voltage of the resistance element, and calculating the difference between the first and second pulse voltages.
REFERENCES:
patent: 4507701 (1905-03-01), Fujiwara et al.
Asaga Hiroshi
Iwai Hiromi
Nakajima Masatoshi
Shiga Satoru
Takao Nobuyuki
Eisenzopf Reinhard J.
Fuji Electric & Co., Ltd.
Snow Walter E.
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