Title :
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
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;
Conference_Titel :
Electrical Insulation (ISEI), Conference Record of the 2010 IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-6298-8
DOI :
10.1109/ELINSL.2010.5549554
