Thermal life indicator

Details Thermal life indicator Thermal life indicator

1989-12-07

1991-05-28

Ro, Bentsu

Electricity: motive power systems

With signals, meters, recorders or testing devices

324158MG, 361 25, 374102, G01K 304

Patent

active

050197606

ABSTRACT:
A method for continuously determining the consumed insulation life of an electrical winding in a rotating machine is described incorporating the steps of selecting constants based on the class of insulation material and rotating machine power rating, measuring the temperature of the insulation over time, determining the consumed life of the insulation for consecutive periods of time and summing the consumed life. The invention overcomes the problem of determining consumed life of electrical insulation.

REFERENCES:
patent: 3209249 (1965-09-01), Warfield
patent: 3301058 (1967-01-01), Roberts
patent: 3638495 (1972-02-01), Sessler
patent: 4525763 (1985-06-01), Hardy et al.
patent: 4733974 (1988-03-01), Hagerman
NUS Corporation and I. L. Brancato, "Life Expectancy of Motors in Mild Nuclear Plant Environments", Electric Power Research Institute, Final Report, Feb. 1985, pp. 6-17 to 6-25.
"Guiding Principles in the Thermal Evaluation of Electrical Insulation", L. J. Berberich and T. W. Dakin; AIEE Aug. 1956.

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