为了研究高压直流（HVDC）输电系统对中缅天然气管道及玉溪支线的影响，制定相应的监测措施，在中缅天然气管道的7处不同位置安装HVDC远程电位监测系统，绘制管道受干扰时的电位图，以此对阴极保护效果及直流杂散电流干扰强度进行评估。当受到干扰时断电电位正于-0.85 V（相对于CSE，下同）判定该处管道处于欠保护状态，当断电电位负于-1.20 V时判定该处管道处于过保护状态。依据该方法对实际的管道情况做出有效的评判。检测结果显示，部分管段受到HVDC干扰出现欠保护现象，需采取进一步防腐蚀措施。

In order to study the influence of high voltage direct current (HVDC) transmission system on China-Myanmar natural gas pipeline and Yuxi spur line and set up the corresponding monitoring measures, HVDC remote potential monitoring systems were installed at 7 different locations of China-Myanmar natural gas pipeline. And potential diagrams were drawn when the the pipeline was in interference, in order to evaluate cathodic protection effect and interference intensity of DC stray current. When the off-potential of pipeline in interference was higher than -0.85 V (vs CSE, the same below), the pipeline was determined to be in low protection. When the off-potential of pipeline in interference was lower than -1.2 V, the pipeline was determined to be in over protection. The above method was used to judge the situation of China-Myanmar pipeline. The monitoring results show that some pipeline segments were in low protection because of HVDC interference, and further corrosion protection measures were necessary.