Unbalances appear in a three - phase system when voltages or currents differ from on phase.

三相系统中,某的电压或电流与其它相不相同时,就出现幅值与或相位的不平衡.

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The UMT 1 can measure an electrical three - phase system with current and voltage measuring inputs.

该城市轨道交通1号文件,可衡量一电器三个阶段的系统与电流和电压测量的投入.

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