某高压燃气管道受紧邻的直流轨道交通系统动态杂散电流干扰严重,管道阴极保护效果较差,排流电流需求量较大。采用数据记录仪进行长时间连续的通、断电电位监测,对管道的阴极保护的有效性和杂散电流干扰情况进行了评价,并对外加电流阴极保护排流的位置进行了优化设计。该方法可以作为钢质燃气管道动态直流杂散电流干扰的评价与防护的借鉴。

A high-voltage gas pipeline was seriously disturbed by the dynamic stray current from adjacent DC rail transit system, the cathodic protection effect of the pipeline was poor, and the demand for discharge current was large. A data recorder was used for long-term continuous power-on and power-off potential monitoring, the effectiveness of cathodic protection of the pipeline and the interference of stray current were evaluated, and the optimal design of discharge position of applied current cathodic protection was carried out. This method can be used as a reference for the evaluation and protection of DC current stray current interference in steel gas pipelines.