变电站接地网的降阻设计探讨

Discussion on Design of Reducing Resistance of Substation Grounding Grid

高土壤电阻率地区的变电站,宜着眼于在征地范围内解决降低接地电阻的问题,可考虑在进站道路路基下设置外延水平接地体,对深回填的大面积回填区设双层接地网;尽量利用征地范围内的低土壤电阻率地层。如政策处理允许,也可考虑外引到征地范围以外。综合利用以上方法,可使变电站的接地电阻达到设计要求。

For substations in the district with high soil resistance rate,it is suitable to solve the problem of reducing grounding resistance within the land acquisition area.It is recommended to install the horizontal extended grounding body under the bed of access road to substation,set up a double-layer grounding grid in large deep backfilled area,make full use of low resistance rate land layer within the land acquisition area to lead the grounding body to that area.Grounding body can be extended outside the land acquisition area only if allowed by the policy.By using these comprehensive methods,the substation grounding resistance can be reduced to meet the design requirement.