The relation formula is given by calculating the phase current and central wire current, thus the motivation of central wire choice is offered.
通过对相电流及中线电流的计算，给出了二者的关系式，为确定选择中线提供了理论依据。
The relation formula is given by calculating the phase current and central wire current, thus the motivation of central wire choice is offered.
通过对相电流及中线电流的计算，给出了二者的关系式，为确定选择中线提供了理论依据。
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