提出一种仅用万用表和标准电阻就可以准确测量出直流母线和支路负荷正对地电阻、负对地电阻的新测量方法，这种方法能准确查找绝缘低故障支路；
This paper describes a new method by which the positive, negative resistance to ground of DC bus and branch could be tested precisely by mere use of universal instruments and standard resistors.
道路：干支路宽16-12米之间，均按国家二级公路以上标准设计施工，路面为沥青砼。
Road : the main bituminous roads, 12m-16m wide, are all constructed according to the National Class II Standard.
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