A quantative approach to estimate the life expectancy of motor insulation systems

Author

Oraee, Hashem

Author_Institution

Sharif Univ. of Technol., Tehran, Iran

Volume

7

Issue

6

fYear

2000

fDate

12/1/2000 12:00:00 AM

Firstpage

790

Lastpage

796

Abstract

Electric motors represent the largest single load in most power systems. With continuing increase in nonlinear loads, the effects of harmonic contents of power systems on various components is becoming more important. This paper is concerned with the effects of power system harmonics and voltage unbalance on the useful life of electric motors. A simple equivalent circuit is used to calculate the additional heat losses caused by supply distortions. A lumped-parameter thermal network is proposed to calculate the resulting heat distribution within the machine. An Arrhenius chart is then used to estimate motor insulation remaining life. The proposed approach is used to determine the effect of supply harmonics and voltage unbalance on the useful life of a three phase induction motor and the results are verified experimentally

Keywords

equivalent circuits; heat losses; induction motors; insulation testing; life testing; machine insulation; machine testing; power system harmonics; Arrhenius chart; additional heat losses; equivalent circuit; harmonic contents; heat distribution; life expectancy; lumped-parameter thermal network; motor insulation systems; nonlinear loads; power system harmonics; supply distortions; supply harmonics; three phase induction motor; voltage unbalance; Dielectrics and electrical insulation; Electric motors; Equivalent circuits; Induction motors; Life estimation; Power electronics; Power system harmonics; Switched-mode power supply; Synchronous motors; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.891990

Filename

891990