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- The voltage unbalance factor derived from symmetrical component analysis requires manipulation of complex quantities. To facilitate the calculation of the voltage unbalance factor in field applications, this paper proposes the method for calculating the voltage unbalance factor in terms of the line voltage magnitudes that are readily available in moat practical circumstances. It is shown that the line voltages appear as circular phasor loci for given voltage unbalance factor, and a graphical chart is developed that can be used to determine the voltage unbalance factor in a straightforward manner avoiding calculation.