地铁下穿110 kV变电站对地网参数影响的分析

Analysis of influence of metro passing 110 kV substation on ground network parameters

针对地铁区间的贯通会导致110 kV变电站下的土壤情况发生变化,可能对变电站地网接地电阻.跨步电压等电气参数产生不利影响。采用加拿大SES公司推出的集成工程软件CDEGS计算分析地铁下穿110 kV变电站对其地网参数的影响。通过建立变电所地网、地铁隧道和土壤模型,分别计算地铁下穿前后变电所地网接地电阻、跨步电压和接触电压的变化,通过与规范计算数值对比结果得出地铁下穿110 kV变电站对其地网参数的影响评价。

Due to the penetration of a metro section in a certain city, the soil conditions under a certain 110 kV substation may change, which may adversely affect the electrical parameters such as grounding resistance and step voltage of the substation grounding network. CDEGS, an integrated engineering software package introduced by SES company of Canada, is used to calculate and analyze the influence of 110 kV substation on its ground network parameters. Through the establishment of substation network, metro tunnel and soil model, the ground resistance, step voltage and contact voltage of underground substation before and after the metro are calculated respectively. Comparing with the normative calculation results, the influence of substation on its ground network parameters is evaluated.