输电线路雷击对临近管道产生的电磁干扰  

Electromagnetic Influence Caused by Lightning Strikes on Transmission Lines to Adjacent Pipelines

作　　者：陈玉亮 沈佳园 张响 李德明 CHEN Yuliang;SHEN Jiayuan;ZHANG Xiang;LI Deming(National Pipeline Network Group Zhejiang Natural Gas Pipeline Network Co.,Ltd.,Hangzhou 310052,China;Zhejiang Zheneng Natural Gas Operation Co.,Ltd.,Hangzhou 310052,China;Shanghai Natural Gas Pipeline Network Co.,Ltd.,Shanghai 201204,China)

机构地区：[1]国家管网集团浙江省天然气管网有限公司,杭州310052 [2]浙江浙能天然气运行有限公司,杭州310052 [3]上海天然气管网有限公司,上海201204

出　　处：《腐蚀与防护》2023年第5期57-64,共8页Corrosion & Protection

摘　　要：高耸的输电线路遭受雷击时产生的雷击电流会漫流到钢制油气管道上或因电磁耦合效应产生较高的感应电压,从而导致员工触电、防腐蚀层损伤或管体烧蚀等危害。梳理了雷击电流对管道影响的评估标准及方法适用性,采用数值模拟和理论分析手段,从人员安全、涂层完整性、管体完整性三方面梳理了雷击干扰下管道风险评估方法,并获得了雷击干扰管道风险定性、定量评估准则。基于风险评估准则,利用数值模拟的办法对案例开展了干扰评估。结果显示:土壤电阻率50Ω·m,距离塔杆接地8.47 m的管道于100 kA雷击干扰下人员安全、防腐蚀层损伤风险小;基于定性风险评估准则,8.47 m间距不满足Mouse离子化安全间距但满足加拿大电力协会(CEA)规定的电弧安全间距,管道损伤风险小;基于定量风险评估准则,管道最大烧蚀深度达0.14 mm(0.88%壁厚),满足管道安全运行强度要求。A Lightning current generated when towering transmission lines are struck by lightning will flow to oil and gas steel pipelines or generate high induced voltage due to electromagnetic coupling effect,resulting in hazards such as electric shocks to workers,damage to anti-corrosion coatings or ablation of pipes.The evaluation standards and method applicability of lightning current influence on pipelines were sorted out,and numerical simulation and theoretical analysis methods were used to sort out the pipeline risk assessment methods under lightning disturbance from three aspects of personnel safety,coating integrity,and pipe integrity.The qualitative and quantitative assessment criteria for pipeline risks under lightning strike interference were obtained.The interference assessment was carried out by numerical simulation in a case based on the risk assessment criteria.The results showed that when the pipeline 8.47 m from tower grounding was struck by lightning in 100 kA current in soil resistivity of 50Ω·m,personal safety could be guaranteed and the anti-corrosion coating had low damage risk.According to the qualitative risk assessment criteria,the distance of 8.47 m did not meet the safety distance of Mouse′s ionization distance but met the safety distance specified by the Canadian electric power association(CEA),so the risk of pipeline damage was small.According to the quantitative risk assessment criteria,the maximum melted depth of the pipeline is 0.14 mm(about 0.88%of pipe wall thickness),which met the strength requirements of pipeline safe operation.

关 键 词：雷击干扰 人身安全 防腐蚀层损伤 管道损伤 安全间距 

分 类 号：TE88[石油与天然气工程—油气储运工程]