论文部分内容阅读
近年来国内的各大城市都在大力发展城市轨道交通项目。这些基础设施建设给百姓出行带来极大方便的同时,也对原已十分密集的地下设施产生了前所未有的危害和挑战。在城市轨道交通运输系统中,一般采用直流牵引走行轨回流的驱动方式。一旦回流通路与大地的绝缘存在问题,直流电流会流人大地,形成随时间变化的动态杂散电流。杂散电流通过邻近的防腐层良好的管道网络可以传送到几公里以外的地方,杂散电流会对邻近的地下金属管线/地下结构产生非常有害的影响。杂散电流
In recent years, major cities in China are vigorously developing urban rail transit projects. While these infrastructure facilities bring great convenience to people’s travel, they also pose unprecedented dangers and challenges to the already extremely dense underground facilities. In the urban rail transit system, the DC traction drive rail retraction drive mode is generally adopted. Once the return path and the earth insulation problems, the DC current will flow to the earth, the formation of dynamic stray current changes over time. Stray currents can pass through the adjacent pipeline with a good pipeline network to a few kilometers away. Stray currents can have a detrimental effect on adjacent underground metal pipelines / underground structures. Stray current