设计室内干扰试验，模拟现实中各类因素下交流杂散电流干扰对管道阴极保护电位的影响。通过数据采集系统对电位信号的采集，滤波系统对交、直流信号的分离，分析得到交流干扰下管道真实阴极保护电位的变化。结果表明:在交流干扰下的管道阴极保护电位会产生较大的IR降，使得管道真实的阴极保护电位偏离地表参比法测得的电位值;同时，在交流杂散电流干扰的瞬间，将会有一个较强的电位信号产生，可能会对恒电位仪及管道防腐蚀层产生不利影响。

An experiment to simulate the interference of alternating current (AC) stray current on the pipeline cathodic protection (CP) potential under different factors was designed. And then the potentials were collected by data acquisition system, and the pipeline CP potential signals were separated from the AC interference signal by designed filter system to get the true pipeline CP potential. The results indicate that there would be a huge IR drop under AC stray current interference, which could make the true CP potential deviated from the test CP potential got by surface reference method. At the time of AC interference emerging, there would be a huge potential signal, which could adversely impact the potentiostat instrument and pipeline coating.