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Experimental Study of Induction Motor Performance with Unbalanced Supply

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A summary of the literature about the effect of unbalanced supply voltage on induction motors is presented. An experimental study was carried out, where rotor currents of a wound-rotor induction motor were measured under different unbalance conditions with respect to positive and negative sequence voltage magnitudes and phase angles. Rotor overcurrent is not a function of the angle between positive and negative voltage components. Effect of rotor overcurrent is under-estimated by the measured stator overcurrent, and rotor currents are closely similar. The currently used unbalanced-voltage derating factors do not seem to consider rotor winding heating, which is only applicable to squirrel-cage rotors.
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Keywords: derating factor; induction motor; power quality; voltage unbalance; winding heating

Document Type: Research Article

Affiliations: 1: Electric Power Systems Protection Institute, National University of Rio Cuarto, Río Cuarto, Argentine 2: Department of Technology, Jaume I University, Castellón, Spain 3: Department of Electrical and Computer Engineering, Kansas State University, Manhattan, KS, USA

Publication date: 2006-07-01

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