Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1991-07-18
1993-03-16
Harvey, Jack B.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324652, G01R 2700
Patent
active
051948176
ABSTRACT:
A testing apparatus for testing electrical insulation, such as cable insulation or electrical rotating machinery ground wall insulation, whereby a cyclically variable inductive reactor is connected in series with an ac power source and the test specimen. The inductance of the reactor is continuously varied such that the magnitude of the inductance is a periodic function of time. As a result the voltage applied to the insulation of the test specimen is in the form of modulated line frequency oscillations passing through resonance.
REFERENCES:
patent: 3515986 (1970-06-01), Peschel
patent: 3609614 (1971-09-01), Schultz
patent: 3761853 (1973-09-01), Schultz et al.
patent: 3781667 (1973-12-01), Tuttle
patent: 3842344 (1974-10-01), Povey
patent: 3968426 (1976-06-01), Ward et al.
patent: 4825171 (1989-04-01), Lefeldt
patent: 5075628 (1991-12-01), Schuster et al.
"An Alternative to DC Testing of Installed Polymeric Power Cables" B. H. Ward and J. P. Steiner, 7th International Symposium on High Voltage Engineering, Aug. 26-30, 1991.
Harvey Jack B.
James G. Biddle Co.
Regan Maura K.
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