浅谈土壤特性对变电站地网冲击接地电阻的影响

The Influence of Soil Characteristics on Impulse Grounding Resistance of Substation Ground Network is Discussed

通过接地分析软件CDEGS对水平以及平均两层土壤结构中地网的工频与冲击接地电阻随土壤电阻率的变化关系进行分析,目的在于了解并掌握土壤电阻率土壤结构对大型变电站地网冲击接地电阻的影响,进而指导变电站地网防雷性能评估。本文以地网冲击接地电阻为主要参数,着重分析土壤电阻率和分层土壤结构对地网冲击特性的影响,为变电站实际工程设计和绝缘配合提供参考意见。

through the earthing analysis software CDEGS levels and average net in two layer soil structure with the impact of power frequency grounding resistance with the changes of soil resistivity is analyzed, aimed at soil resistivity and soil structure on the impact grounding resistance of large substation ground network effects to understand and master, and then guide the substation ground network lightning protection performance evaluation. In this paper, the impact resistance of grounding grid is taken as the main parameter, and the influence of soil resistivity and layered soil structure on the impact characteristics of grounding grid is emphatically analyzed, so as to provide reference for the actual engineering design and insulation coordination of substation.