A coupled electro-thermal study of the stress grading system of medium voltage motor coils when energized by repetitive fast pulses

Author

Sharifi, E. ; Jayaram, S. ; Cherney, E.A.

Author_Institution

ECE Dept., Univ. of Waterloo, Waterloo, ON, Canada

fYear

2010

Firstpage

1

Lastpage

4

Abstract

The paper discusses the temperature profile along the stress grading and the conductive armor layers on the endwinding of a 13.8 kV motor coil when energized by repetitive fast pulse voltages such as pulse width modulated (PWM) voltages. The effect of the pulse rise time in the temperature profile at the end portion of the motor bar is also measured experimentally. The thermal stress due to two equivalent high frequency sinusoidal voltages is analyzed using 3D FEM coupled electrical and thermal modeling.

Keywords

coils; electric motors; finite element analysis; machine windings; thermal stresses; 3D FEM; PWM voltages; conductive armor layers; electrothermal study; endwinding; frequency sinusoidal voltages; medium voltage motor coils; pulse width modulated voltages; stress grading system; thermal stress; voltage 13.8 kV; Coils; Couplings; Frequency; Medium voltage; Pulse measurements; Pulse width modulation; Space vector pulse width modulation; Temperature; Thermal stresses; Time measurement; corona; fast pulses; motor coils; stress grading; surface discharges; thermal stress;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation (ISEI), Conference Record of the 2010 IEEE International Symposium on

Conference_Location

San Diego, CA

ISSN

1089-084X

Print_ISBN

978-1-4244-6298-8

Type

conf

DOI

10.1109/ELINSL.2010.5549554

Filename

5549554