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  引言目前电力工程上普遍采用三相制供电，由三个幅值相等、频率相同（我国电网频率为50HZ），彼此之间相位互差120o的正弦电压所组成的供电相系统。三相制供电比单相制供电优越在发电方面：三相交流发电机比相同尺寸的单相交流发电机容量大。 在输电方面：如果以同样电压将同样大小的功率输送到同样距离，三相输电线比单相输电线节省材料。在用电设备方面：三相交流电动机比单相电动机结构简单、体积小、运行特性好等等。因

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