高土壤电阻率地区降阻措施研究

Research on decreasing soil resistivity in high soil resistivity regions

位于高土壤电阻率地区的变电站接地网接地电阻较高,且变电站征地困难和费用较高等常规降阻方案难以达到预期效果。本文针对此提出了3种适用的降阻措施。双层地网系统,适用于底层土壤电阻率较低的情况;离子接地极深井系统,适用于土壤电阻率高的情况;斜长接地系统,适用于土壤电阻率不是很高且底层土壤电阻率不降低的情况。本文对这3种降阻措施分别进行了详细研究,具有实际参考意义。

High soil resistance rate in the substation could result in high grounding resistivity. Conventional method to solve this problem such as enlarging the grounding grid area is hard to implement due to the high land acquisition cost. Hence, three methods to decrease the soil resistivity without redundant land are proposed. Double-layer ground grid method is used when the deeper soil obtains low soil resistivity; ion earthing electrode method is used for the region which has rather high soil resistivity; inclined electrode methodis suitable for the area with uniformly distributed soil and intermediate soil resistivity. These methods have been analyzed and proved to be effective in engineering practice.