分层土壤模型下大型接地网冲击特性研究

Impact Characteristics of Large Grounding Grid under Layered Soil Model

为了分析分层土壤模型下大型接地网的冲击特性参数分布规律,包括暂态地电位升、接触电压和跨步电压等,结合在陕西渭南市某地测量土壤电阻率试验的基础上,通过CDEGS软件建立了分层土壤模型下的大型接地网常规设计模型,并针对模型进行了30 kA雷电流冲击特性仿真,得到了大型接地网在雷电流入侵时的地电位升分布,并针对常规接地网的设计提出了两种不同的优化方案,以尽可能降低雷电流流入接地网时的地电位升,使地电位升分布均匀,比较得出一种优选方案,可作为大型接地网工程设计的参考建议,具有一定的工程实用价值。

In order to analyze the impact characteristic parameters distribution of the large-scale grounding grid under layered soil model,including the transient ground potential rise,contact voltage and step voltage,the design model of the large-scale grounding grid under layered soil model is established through the CDEGS software,based on the soil resistivity measurement test in Weinan city,Shaanxi province.Simulation of 30 kA lightning current impact characteristics is carried out.In order to reduce the ground potential rise when the lightning current flows into the grounding grid and make the distribution of ground potential rise uniform,an optimal design is proposed,which can be used as a reference for the engineering design of large grounding grid.