雷击输电线路对地上油气管道干扰影响

Disturbance and Influence of Transmission Line Struck by Lightning on Above-Ground Oil and Gas Pipeline

输电线路与油气管道的建设经常出现并行,必须分析雷击输电线路对地上油气管道的电磁干扰。分析了雷击输电线路对管道电磁耦合作用。考虑线路与管道间感性耦合、容性耦合和阻性耦合作用,在ATP-EMTP中建立线路、杆塔和管道模型。分析线路与管道间距、管道参数、防腐层电阻率对管道防腐层过电压影响。仿真结果表明:距离雷击点越远的管道,耦合产生过电压越小;管道防腐层过电压随线路与管道间距的增加而衰减;管道外径和壁厚对过电压影响较小;防腐层电阻率对过电压影响较大。需要确定安全距离保护管道防腐层和管道本体。

In view of the fact that transmission lines may often parallel with oil and gas pipeline, it is necessary to analyze the disturbance of transmission line struck by lightning on above-ground oil and gas pipelines reasonably. The electromagnetic coupling effect of lightning transmission line on pipeline is analyzed. Considering the effects of inductive coupling, capacitive coupling and resistive coupling between lines and pipes, the equivalent models of transmission line, tower and pipeline are established based on ATP-EMTP. The influence of separated distance between transmission line and pipeline,parameters of the pipe and anticorrosion coating insulation resistivity on overvohage on the pipe are researched. The results show that： overvoltage on the pipeline decreases with longer separated distance between transmission line and pipeline. In contrast with anticorrosion coating insulation resistivity, pipe diameter and pipe thickness have little impact on the overvoltage. Safety distances need to be acquired to protect of pipeline anticorrosion coating and pipe body.