Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-04-21
1983-10-18
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3112
Patent
active
044108516
ABSTRACT:
Apparatus for detection of insufficient dielectric strength of coil insulation of an electric machine. The apparatus comprises a capacitive measurement bridge wherein the conductor coils are connected to a measuring leg thereof. Following balancing of the bridge, predetermined threshold amplitudes of current impulses are measured after being passed through a narrow band frequency selection means. The current impulses due to partial discharges in the insulation of the coils are thus measured and the voltage applied to the coils is varied to provide measurements over a range of voltage values. A maximum voltage peak occurring in the range of voltages about the service voltage of the machine is indicative of insufficient dielectric strength of the coil insulation.
REFERENCES:
patent: 2890410 (1959-06-01), Holcomb
patent: 3967196 (1976-06-01), Bennett
Electrical Engineering in Japan, vol. 93, No. 1, H. Terase and A. Motomura "Development of a New Automatic Insulation Analyzer", pp. 14-22.
Andreas Kelen, "Critical Examination of the Dissipation Factor . . . ", IEEE Trans. Electr. Insul. vol. EI-13, No. 1, pp. 14-24 (1978).
Tor Orbeck, "The Measurement of Partial Discharges in High-Voltage Coils . . . " ASEA Journal, vol. 40, No. 9, pp. 125-128 (1967).
P. R. Dudukovic, "Prophylaktische Kontrollmessungen an Isolierungssystemem . . . " Elektrie 25, pp. 473-475 (1971).
Ateliers de Constructions Electriques de Charleroi
Krawczewicz Stanley T.
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