冻土地区变电所接地方案研究

土壤电阻率是影响变电所接地网设计的重要因素，冻土地区随季节的变化地表土壤电阻率将会发生较大变化。以长春南500kV变电所田家油坊站址为例，研究了冻土地区变电所深埋水平接地网、双层接地网、水平接地网与垂直接地极相结合三种不同类型的接地方案，比较与分析了三种接地方案的接地性能，得出水平接地网与垂直接地板相结合的接地方案的接地性能最优的结论。同时，对垂直接地极进行了优化分析，结果袁明10m＋5m垂直接地极方案及稀疏10m垂直接地极方案同为最佳方案。

Research on the station ground suggestion in the frozen region

Soil resistivity is the important factor to affect the design of substation grounding grids, and the surface resistivity will change great with the seasonal changes in the frozen region. Three ground plans were studied which were deeper grounding, double grounding and complex grounding. Taking the 500 kV substation in the Changchun South as an example, the performance of the three grounding plans was compared. In conclusion, complex grounding was the best grounding plan of all. At last, the complex grounding was optimized by changing the vertical grounding, and two better plans were feasible, which were 10 m ＋ 5 m vertical grounding rod and sparse 10 m vertion ground rod.