高土壤电阻率地区降阻方案研究

Scheme for Resistance Reduction at High Soil Resistivity Areas

我国西南地区铁路沿线地质地貌较复杂,牵引变电所大多建于岩石地质结构的地区,其接地电阻远达不到安全要求。通过现场勘察,分析垂直接地极的布置位置、长度、材料等对接地网降阻的影响,确定采用深井接地极与柔性石墨材料的降阻方案。通过仿真计算及实例验证,得出敷设柔性石墨接地材料作为垂直接地极,且在深井中加入高能回填料,能够有效降低高土壤电阻率地区地网阻值。

In the southwest of China, the geological and geomorphic conditions along the railway are more complex. Most of the traction substations are built in the area where the soil is mostly of rock structure, and the grounding resistance is far from the safety requirements. Through site survey, the resistance reduction effect of the vertical grounding electrode is analyzed, such as the location, length and material of the grounding electrode, and then the resistance reduction scheme of the material with deep grounding electrode and flexible graphite is determined. Through simulating calculation and the actual verification, a determination to lay 8 deep burial flexible graphite grounding materials with burial depth of 40 m as the vertical grounding electrodes, and add high-energy backfill in the deep well can effectively reduce the resistivity of grounding network in the area where the soil is of high resistivity.