某天然气管道受到了剧烈杂散电流干扰。通过电位监测对管道受到的干扰程度进行评价，分析了杂散电流流入、流出规律，并确定了干扰的分区。通过馈电试验研究了增大阴极保护电流对抑制电位正向偏移的作用。结果表明：管道受强烈的地铁直流杂散电流干扰；管道两端管段互为直流杂散电流流入流出区域，管道中间管段与两端管段互为直流杂散电流流入流出区域；阴极保护电流可以有效抑制管道电位正向偏移，但是抑制范围（长度）是有限的。地铁动态直流杂散电流对管道的干扰问题需要地铁方与管道方共同协作。

A natural gas pipeline was interfered by strong stray current. The degree of interference to pipeline was evaluated by potential monitoring, the law of stray current inflow and outflow was analyzed, and the interference zone was determined. The effect of increasing cathodic protection current on suppressing positive potential shift was studied by feeding test. The results show that the pipeline was interfered by strong DC stray current from subway. The pipe sections at both ends of the pipeline were the inflow and outflow areas of DC stray current for each other, and the middle section of the pipeline and the two ends of the pipeline were the inflow and outflow areas of DC stray current for each other. Cathodic protection current could effectively suppress the positive deviation of pipeline potential, but the suppression range (length) was limited. The problem of dynamic DC stray current interference from subway to pipeline requires the cooperation of the subway party and the pipeline party.