Reduction in capacity of polyphase motors due to unbalancing in voltage

Author(s): S. B. Charters ; W. A. Hillebrand
Publisher: IEEE - Institute of Electrical and Electronics Engineers, Inc.
Publication Date: 1 June 1909
Volume: 28
Page(s): 565 - 578
ISSN (Paper): 0097-2444
DOI: 10.1109/PAIEE.1909.6660372



It is well-known that polyphase motors of both induction and synchronous types overheat when supplied from circuits in which the ideal conditions of voltage balance and phase angle are not maintained. In order to determine definitely the performance under other than ideal conditions, and to ascertain the points at which overheating commences, a series of tests was run under varying conditions of voltage unbalance, unsymmetrical angular relations between phases, and combinations of these two.