The widely used symmetrical coordinates method for power system analysis is reviewed and com-pared with the direct phase coordinates method.
本文对电力系统分析计算中的对称分量法进行了评述，并与相坐标法进行比较。
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As one of the connections for three phase induction motor to operate from single phase supply, SEMIHEX connection can enable three phase induction motor have approximated symmetrical operation.
A plan for designing and setting up a model of moving graph for the symmetrical three phase voltage is proposed, and it is developed and used in the microcomputer.