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Effects of unbalanced voltage on the operation performance of a three-phase induction motor

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1 Author(s)
Ching-Yin Lee ; Dept. of Electr. Eng., Nat. Taipei Univ. of Technol., Taiwan

This paper uses a real load test to investigate the effects of an unbalanced voltage supply on an induction motor's performance. Based upon various experiments, including: (1) cases with the same unbalance voltage factor but different unbalanced voltages; (2) cases with only one unbalanced voltage but different degrees of unbalance; and (3) cases with the same positive-sequence voltage but different negative-sequence voltages, the importance of the positive-sequence voltage in the motor's apparent performance and of the negative-sequence voltage in the hidden damage are pointed out. Finally, it is strongly suggested that the related regulations, and a motor's derating factor and temperature rise curves should be based on not only a voltage unbalance factor, but also the magnitude of the positive-sequence voltage

Published in:

IEEE Transactions on Energy Conversion  (Volume:14 ,  Issue: 2 )