土壤特性对双圆环直流接地极跨步电压分布的影响

Influnce of Soil Properties on Step Voltage Distribution of Double Ring DC Grounding Pole

为研究土壤特性对特高压直流接地极跨步电压分布的影响,采用CDEGS软件建立了双圆环直流接地极仿真模型,对比分析了不同土壤特性下双圆环直流接地极上方跨步电压分布规律。计算结果表明:在均匀土壤中,双圆环直流接地极上方跨步电压随着土壤电阻率的增大而升高;在水平双层土壤中,表层土壤电阻率的变化对双圆环直流接地极上方跨步电压分布影响较为显著,当表层土壤超过一定厚度后,表层土壤厚度的变化对双圆环直流接地极上方跨步电压影响较小。

In order to study the influence of soil characteristics on the step voltage distribution of UHVDC grounding poles,a simulation model of double-ring DC grounding poles was established by using CDEGS software. The step voltage distribution over double-ring DC grounding poles under different soil characteristics was compared and analyzed. The results show that in uniform soil,the step voltage above the double-ring DC grounding electrode increases with the increase of soil resistivity;in horizontal double-layer soil,the change of surface soil resistivity has a significant impact on the step voltage distribution above the double-ring DC grounding electrode. When the surface soil exceeds a certain thickness,The change of surface soil thickness has little effect on the step voltage above the double-ring DC grounding pole.