Assessment of Voltage Unbalance Factor to Evaluate its Effect on Three Phase Induction Motor

Firstly, this paper provides the fundamental understanding of voltage unbalanced (VU) and its adverse impacts on three phase induction motors (3-ΦM). Then, the voltage unbalanced factor (VUF), provided by IEC standard, has been considered to quantify the impacts of VU on the
$3-\phi$
IM. The various parameters of performance, such as the copper loss, the input power factor and the efficiency for a
$3-\phi$
IM are computed for the fixed and different values of VUF. It is revealed that the VUF alone is not a sufficient index to assess the impacts of VU as there can be innumerous voltage sets possible for a fixed value of VUF. Therefore, in this work it is asserted that, one more index, representing the condition of VU, is highly desirable along with VUF to get accurate impacts of VU on
$3-\phi$
IM. Finally, the various indices to quantify the condition of VU have also been incorporated in discussion. Also, the performance parameters of
$3-\phi$
IM are estimated with these indices to show the impacts of condition of VU on the performance of
$3-\phi$
IM.