500/±800kV交直流同塔混压输电线路对并行油气管道的电磁影响分析

Electromagnetic Influence of 500/± 800 kV AC/DC Mixed Voltage Transmission Lines on Parallel Oil and Gas Pipelines

为研究交直流混压输电线路对平行敷设油气管道的电磁影响,以500/±800 kV交直流混压同塔架空线路与输油输气管道并列运行为背景,利用电磁暂态仿真软件ATP建立输电线路与油气管道等效时域模型,计算了无限长、有限长管道感应电压,有限长管道的交流电流密度,并分析了交流线路、直流线路对管道感应电压的影响程度。结果表明:感应电压主要由交流输电线路引起;无限长管道与输电线路并列运行部分的感应电压未超过职业人员人体安全电压限值;当平行油气管道两端绝缘悬空时,其感应电压最高可达452.88 V,远远超过职业人员人体安全电压限值60 V;无限长管道并行端部交流电流密度高达129.47 A/m^(2),管道二分之一处仅为10.76 A/m^(2),并行管道端部必须采取交流干扰防护措施。所得结论可为交直流同塔输电线路与油气管道并列建设提供技术指导。

In order to study the electromagnetic influence of AC/DC mixed pressure transmission lines on the parallel oil and gas pipelines,500/± 800 kV AC/DC mixed overhead lines and oil and gas pipelines are operated side by side as the background. The electromagnetic transient simulation software ATP is used to establish the equivalent time domain model of transmission lines and oil and gas pipelines,calculates the induced voltages of infinitely long and finitely long pipelines,the AC current density of finitely long pipelines,and the influence of AC and DC lines on the induced voltages of pipelinesis also analyzed. The results show that: the induced voltage is mainly caused by the AC transmission line;the induced voltage of the parallel running part of the infinitely long pipeline and the transmission line does not exceed the safety voltage limit of the human body of the professional;When both insulation ends of the parallel oil and gas pipeline are suspended,the maximum induced voltage can reach 452. 88 V,which is far more than the limit of human safety voltage for professional personnel of 60 V;the AC current density of the parallel end of an infinite pipe is as high as 129. 47 A/m^(2),and the half of the pipe is only 10.76 A/m^(2).AC interference protection measures shall be taken at the end of the pipelines. The conclusions provide technical guidance for the parallel construction of AC & DC transmission lines on the same tower together with oil and gas pipelines.