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随着我国经济的持续增长,交流输电线路对输油输气管道的电磁影响问题日益突出。基于管道-大地回路传输线模型,获得了交流输电线路正常运行时在输油输气管道上产生的感性耦合电压的解析表达式。经过严格推导,提出了管道两端接匹配阻抗时管道饱和平行长度的概念,即随着管道平行长度的增大,管道感性耦合电压先逐渐增大,然后略有降低,并最终基本趋于稳定。通过仿真计算,拓展了线路与管道斜接近时等效接近距离现有经验公式的适用范围,计算误差可控制在5%以内。研究成果可供电力部门和石油管道部门进行管道安全评估或确定管道与线路的最小安全距离。
As China’s economy continues to grow, the issue of the electromagnetic influence of AC transmission lines on oil and gas pipelines has become increasingly prominent. Based on the pipeline - earth loop transmission line model, an analytical expression of the inductive coupling voltage generated on the gas transmission pipeline during normal operation of the AC transmission line is obtained. After rigorous derivation, the concept of parallel pipe length is proposed when the impedance is matched at both ends of the pipe. As the parallel length of the pipe increases, the inductive coupling voltage of pipe increases first and then decreases slightly and finally stabilizes . Through the simulation calculation, the applicable range of the existing empirical formula of the equivalent approach distance between the line and the pipe when the pipe is obliquely inclined is expanded, and the calculation error can be controlled within 5%. The results of the study can be used by utilities and oil pipeline authorities to assess pipeline safety or to determine the minimum safe distance between pipelines and routes.