交流架空线对平行埋地钢制管道感性耦合的计算研究

Calculation method for coupling voltage of parallel buried steel pipelines during normal operation of AC overhead transmission lines

随着城市发展和能源需求的持续增大,交流架空输电线路对埋地钢制管道的电磁影响问题愈加突出。而传统方法主要利用电磁场仿真或大地回路等效模型实现耦合电压的计算,其方法复杂且耗时长。针对上述问题,提出了一种针对交流架空输电线路正常运行时对平行埋地钢制管道耦合电压的计算方法。文中首先建立计及多因素影响的单位长度管道耦合电压计算模型,其次通过分析绝缘连接和管道破损等因素对感性耦合电压最低点位置的偏移作用,给出了最低点位置的计算方法以确定管道耦合电压分布形式,最后提出了基于单位长度管道感性耦合电压增量和耦合电压分布形式的管道耦合电压计算方法。实例分析表明,相比于仿真值和实测值,其误差低于10%,能对管道耦合电压进行合理计算。

With the increase of urban development and energy demand, the electromagnetic influence of overhead alternating current(AC) transmission lines on buried steel pipelines is becoming more serious. Traditionally, the coupling voltage calculation methods mainly include electromagnetic simulation and calculation using earth loop equivalent model, which are complicated and time-consuming to get the pipeline coupled voltage. So, a method for calculating the coupled voltage on pipelines nearby the overhead transmission lines is proposed. Firstly, a calculation model for the unit-length pipeline coupling voltage under multiple factors is established. Secondly, by discussing the offset effect of insulation connection and pipeline breakage on the lowest point of inductive coupling voltage, the calculation method of the lowest point is given to determine the distribution form of pipeline coupling voltage. Finally, the calculation method of coupled voltage based on the increment of inductive coupling voltage per unit length pipeline and the distribution of coupling voltage is proposed. The example analysis shows that the error is less than 10% compared with simulated value and the measured value, and the coupling voltage can be reasonably calculated.