星形联结的三相电源,若线电压为U23=380√2sin(ax+30)V,则相电压m为
A.220√2sin(ωt+120)V
B.380√2sin(ωt+30)V
C.380√2sin(ωt+120)V
D.220√2sin(ωt-120)V
正确答案是A
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