Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1996-08-02
1999-02-02
Brock, Michael
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324557, 324772, G01R 3106
Patent
active
058670297
ABSTRACT:
A method of nondestructive insulation testing is disclosed which comprises the steps of: (a) placing an electric device, having a core and at least one winding provided on the core, in a reduced atmospheric pressure; (b) insulating the laminated core from the ground; (c) supplying a voltage signal having a first surge waveform to the winding; and detecting a glow discharge which may result from step (c) to detect an insulation condition of the winding, wherein the reduced atmospheric pressure ranges from 65 to 75 Torr and the voltage signal is applied in the first direction of the winding and then, is applied in the second, opposite, direction of the winding. This method may further comprise steps of: (d) supplying a second voltage signal having a second predetermined surge waveform having a peak voltage lower than a peak voltage of the predetermined surge waveform; (e) outputting a second output signal between the winding indicative of a second insulation condition of the winding in response to step (d); (f) measuring intervals corresponding to the wavelengths of the output signal and the second output signal respectively; and (g) judging the insulation condition by comparing the measured intervals to each other. A nondestructive insulation testing apparatus is also disclosed.
REFERENCES:
patent: 2948849 (1960-08-01), Foster
patent: 2996664 (1961-08-01), Vogel et al.
patent: 3775686 (1973-11-01), Ganger et al.
patent: 3862491 (1975-01-01), Richardson
patent: 3887866 (1975-06-01), Safer et al.
patent: 3932806 (1976-01-01), Kawada
patent: 5594348 (1997-01-01), Iijima et al.
Iijima Yasuo
Tsubokawa Masahiro
Brock Michael
Matsushita Electric - Industrial Co., Ltd.
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