Apparatus for measuring a winding temperature of electric machin

Details Apparatus for measuring a winding temperature of electric machin Apparatus for measuring a winding temperature of electric machin

1990-08-17

1992-10-06

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324545, G01R 3102, G01R 3106

Patent

active

051535068

ABSTRACT:
An apparatus for measuring the winding temperature of electric machines uses an a.c. reference voltage source generating an a.c. reference voltage with a predetermined, non-line frequency, preferably below 10 Hz., a current detector detecting the current generated from the a.c. reference voltage and/or the a.c. reference voltage directly, and a measuring and evaluating device measuring the current to determine the winding temperature. The a.c. reference voltage is added geometrically to the line voltage and generates a current proportional to the winding conductance which is temperature dependent.

REFERENCES:
patent: 4083001 (1978-04-01), Paice
patent: 4420721 (1983-12-01), Dorey et al.
patent: 4741023 (1988-05-01), Lawson
patent: 4829234 (1989-05-01), Gretsch
patent: 4914386 (1990-04-01), Zocholl
Conference Paper of the IEEE Power Engineering Society, 31 Jan.-5 Feb. 1971, pp. 1-8, IEEE, New York, G. S. Hope: "Machine Identification Using Fast Fouerier Transform".

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