基于分布式辅助散流接地网的天然气管道过电压防护

由于共建城市地下走廊,输电线路常与天然气管道并行敷设,当输电线路遭受雷击时,通过杆塔接地网向附近土壤散流会导致邻近天然气管道损耗的问题。为了研究雷击输电线路对天然气管道的具体影响,本文通过COMSOL Multiphysics仿真软件建立临近管道处杆塔辅助接地网散流模型,对比分析了杆塔辅助接地网的外延长度、面积、敷设方向、连接线数量以及土壤电阻率等因素对杆塔接地电阻和天然气管道电压峰值的影响,进而提出了基于杆塔辅助地网的管道过电压防护方案。仿真结果表明:减小土壤电阻率、增加辅助地网外延长度、面积和连线数量会降低天然气管道感应电压峰值;135°敷设辅助地网对天然气管道感应电压峰值防护效果最优。本文研究结论可为城市综合能源走廊建设提供参考。

Overvoltage Protection of Gas Pipelines Based on Distributed Auxiliary Dispersion Grounding Grid

Due to the construction of urban underground corridors,transmission lines are often parallel to gas pipelines,which may lead to the loss of adjacent natural gas pipelines when the lightning striked transmission lines.In order to study the impact of lightning transmission lines on natural gas pipelines,this paper establishes the scattered flow model of the adjacent pole tower auxiliary grounding network by COMSOL Multiphysics simulation software to analyzes the factors,such as the external extension,area,laying direction,the number of connecting lines and soil resistivity on the pole tower ground resistance,how to change the voltage peak of the natural gas pipeline.Herein,a pipe overvoltage protection scheme based on the auxiliary ground network of the pole tower is proposed.The simulation results show that reducing soil resistivity,increasing the extension,area and number of wires will reduce the voltage peak of the natural gas pipeline.The 135°laying auxiliary grounding grid has the best effect on the peak protection of the induction voltage of natural gas pipeline.The conclusion of this paper can provide reference for the construction of urban comprehensive energy corridor.