埋地金属管道周围存在着大量的高压输电线路,这些设施在运行过程中通过感性耦合在输油管道上产生交流电压,交流电压干扰强制电流阴极保护的恒电位仪的正常工作。输油管道长时间受杂散电流影响,严重时将造成管道的腐蚀穿孔。经排流保护措施后,管道的电位偏移值有明显减小,从而达到减少管道腐蚀的目的。 There are a large number of high voltage transmission lines around the buried metal pipelines. These facilities generate AC voltage on the oil pipeline through inductive coupling during operation, and the AC voltage interferes with the normal operation of the cathodic protection potentiostat. Oil pipelines are affected by stray current for a long time, which will lead to corrosion and perforation of pipes. After drainage protection measures, the pipeline potential offset value is significantly reduced, so as to achieve the purpose of reducing pipe corrosion.