JEE_V1_N3_A2 C. Thanga Raj Pramod Agarwal S.P. Srivastava Journal on Electrical Engineering 2230 – 7176 1 3 7 12 Economics, induction motors, power quality, unbalanced voltage This paper investigates the deviations in the effects of different unbalanced phase voltages with same unbalance factor (1%) on the performance of induction motor in terms of Total Harmonic Distortion (THD) and efficiency. Under all voltage conditions, the performance of a 5 HP three-phase squirrel-cage induction motor was measured through a real load test. According to the test results and analysis, particular unbalanced voltage offers slightly lower negative effects on the motor’s performance. The financial losses caused by unbalanced voltage of the same motor are determined.Theoretical results in terms of temperature rise, losses and torque ripple are also presented in wide range of unbalance voltages by using MATLAB SIMULINK for supporting practical studies. January - March 2008 Copyright © 2008 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=409