地铁专用回流轨牵引供电系统应用方案

分析了常规地铁牵引供电系统采用走行轨兼做回流轨存在的问题,以及杂散电流腐蚀问题带来的严重危害。针对目前专用回流轨技术方案发展现状,推荐采用网轨混合牵引供电系统的应用方案。通过对该方案中重点问题的分析,推荐采用专用回流轨和接触网同位置设置电气分段的方案,在牵引供电上网点和回流点处设双极隔离开关;推荐在负极对地之间设置单向导通装置作为漏电保护装置;推荐设置绝缘监测装置对各区段的专用回流轨对地绝缘状况进行定期监测,以便及早发现绝缘薄弱点并清查处理。

Research on Application Scheme of Traction Power Supply System with Special Return Conductor Rail for Metro

The problems that exist in using running rail as return rail in conventional metro traction power supply system are analyzed,and serious hazards caused by stray current corrosion are described.In view of the current development status of the technical scheme of special return conductor rail,the application scheme of adopting the traction power supply system that consists of catenary and special return conductor rail is recommended.Through analysis of key problems in this application scheme,it is recommended to adopt the scheme in which special return conductor rail and catenary are sectionalized at the same position,and bipolar isolation switch is set up at the catenary connection point and traction power supply return point.It is recommended to set up one-way conduction device between the negative pole and ground as the leakage protection device.It is recommended to set up insulation monitoring device for the special return conductor rail of each section to ground,and the insulation resistance shall be monitored regularly so that insulation weak points are discovered,checked upon and dealt with as early as possible.