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.
牵引变电所地网改造受场地限制，必须仔细设计才能够使接地电阻达到要求。
Since its reconstruction will be constrained by the site space, so the prudential design is needed so as to reach the required grounding resistance.
牵引变电所地网改造受场地限制，必须仔细设计才能够使接地电阻达到要求。
Since its reconstruction will be constrained by the site space, so the prudential design is needed so as to reach the required grounding resistance.
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