某机坪管道直流杂散电流排流技术探讨

Discussion on DC Stray Current Drainage Technology of Apron Pipeline

在机场地铁运营过程中,由于回流轨存在着电气阻抗,牵引电流在回流轨中产生压降,并且回流轨对地存在着电位差,会导致回流线对隧道道床、周围土壤介质、机坪埋地管道存在着一定的泄漏电流,形成杂散电流。当杂散电流流出管道时,会对管道产生严重的电化学腐蚀影响,最终会导致管道腐蚀穿孔泄漏。因此,研究杂散电流对机坪管道影响,对提高机坪管道安全稳定运行的可靠性有非常大的意义。

In the operation process of airport subway,due to the electrical impedance of return rail,traction current will produce pressure drop in the return rail,and there is potential difference between the return rail and the ground,which will lead to a certain leakage current of the return line to the tunnel track bed,the surrounding soil medium and the buried pipeline on the apron,resulting in stray current.When the stray current flows out of the pipeline,it will have a serious electrochemical corrosion effect on the pipeline,and eventually lead to pipeline corrosion perforation leakage.Therefore,it is of great significance to study the influence of stray current on apron pipeline to improve the reliability of safe and stable operation of apron pipeline.