介绍了钢管式钻具的制作、构造原理，以及在变电所接地网敷设中的应用情况。
The mechanical principle and the manufacture of the steel barrel type barer, and its operation in the substation ground network construction have been introduced.
在目前国内的变电所接地系统设计中，采用常规水平接地极网加上垂直接地极的型式最为普遍。
In our design of grounding system in substation, compound grounding network is adopted widely which is composed of horizontal grids and vertical grounding rods.
在发电厂和变电所内，直流系统接地故障的检测，过去一直采用手动方式来完成。
In electric power plants and substations, a detection of DC system ground fault was usually completed in hand manner, which is very much trouble and danger.
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