电力线路与燃气管道交叉跨越点雷击事故防护研究

针对临近杆塔接地网的管道过电压及防护问题，采用CDEGS仿真计算软件建立电力杆塔接地网及临近燃气管道结构模型，研究杆塔与管道间距、土壤电阻率和接地排流线等因素对管道过电压的影响；并提出通过优化电力杆塔接地网外延射线结构降低管道过电压的改造方案。研究结果表明:管道上的雷击过电压受散流间距、土质条件等因素的影响，并基本呈现线性关系；管道增设排流设施后，过电压减小；接地网外延射线结构改造后管道过电压抑制作用明显。研究结果可为实际燃气管道安全防护及电力设计施工提供理论参考。

Research on protection of lightning strike accident at crossing point between power line and gas pipeline

Aiming at the problem of over-voltage and protection of the pipeline near the tower grounding grid,this paper firstly uses CDEGS simulation software to establish the electric tower grounding grid and adjacent gas pipeline structure model; Secondly,the effects of factors such as spacing between tower and pipeline ,soil resistivity and the ground drain line on the pipeline overvoltage are studied; Finally,a retrofit scheme for reducing the overvoltage of the pipeline by optimizing the epitaxial ray structure of the electric tower grounding grid is proposed.The research indicates that the lightning overvoltage on the pipeline is affected by factors such as the distance of scattered currents and soil conditions,and basically shows a linear relationship;After adding drainage facilities to the pipeline,the overvoltage is reduced;After the structural transformation of the epitaxial ray of the grounding grid,the overvoltage suppression of the pipeline is obvious.The conclusions can provide a theoretical reference for the actual gas pipeline safety protection and power construction.