基于高速铁路典型车站牵引供电系统仿真模型的降低绝缘节两端电位差方案  

Solution to Reduction of Potential Difference on Both Ends of Insulation Joint Based on Simulation Model of Traction Power Supply System in Typical Station of High Speed Railway

作　　者：杨世武[1] 李奕霖[1] 陈海康[2] 崔勇[1] 王俊飞[2] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]中国铁道科学研究院标准计量研究所,北京100081

出　　处：《中国铁道科学》2016年第2期70-77,共8页China Railway Science

基　　金：国家自然科学基金资助项目(61473029);中国铁路总公司科技研究开发计划项目(2014X008-I);北京全路通信信号研究设计院集团有限公司委托项目(15KY-F-035)

摘　　要：以兰新二线高速铁路某车站及其邻接区间为例,采用节点电压方程法建立该车站及其邻接区间全并联AT牵引供电系统的仿真模型,仿真计算不同条件下列车在车站侧线通过或者发车时轨道电路绝缘节两端的电位差。仿真结果表明:当列车牵引电流减小至200A时,绝缘节两端的电位差可降至20V以下;当道砟漏泄电阻为100Ω·km且列车牵引电流达到500A时,绝缘节两端的电位差将超过60V的安全接触电压;在增加横向连接线后,当列车牵引电流不超过300A时,绝缘节两端的电位差可降低至20V以下。由此得出在现有条件下降低绝缘节两端电位差的解决方案:列车牵引电流应控制在200A以内;合理增设横向连接线。为从根源上避免拉弧引发的绝缘节烧损现象,提出在车站侧线回流切断点处增加回流匹配器的方案,使其连接绝缘节两端的扼流变压器,从而形成等电位,同时可有效隔离轨道电路信号。Taking a certain station and its adjacent sections on the second line of Lanzhou-Xinjiang high speed railway as case study,its simulation model with all parallel AT traction power supply system was established based on the method of node voltage equations to calculate the potential difference on both ends of the insulation joint of track circuit under different conditions when train passing or departing from station sidetrack.The simulation results show that the potential difference will drop below 20 V when the traction current of train is reduced to 200 A.Given the ballast leakage resistance of 100Ω·km and the traction current of 500 A,the potential difference may exceed the safety contact voltage of 60 V.The potential difference can decrease to 20 Vor less if extra transverse connection line is added and the traction current is less than 300 A.Therefore,the solution to the reduction of potential difference on both ends of the insulation joint under the existing conditions can be summarized as follows：the traction current of train should be controlled under 200A;or transverse connection line can be added reasonably.In order to primarily avoid the damage to insulation joint caused by electric arcing,a scheme is put forward to add returncurrent match unit at the return-current cut-off point of station sidetrack,by which the choke transformers at both ends of insulation joint are connected,thus equipotential appears and meanwhile track circuit signal is effectively isolated.

关 键 词：高速铁路 车站侧线 牵引供电系统 轨道电路 绝缘节 电位差 回流匹配器 

分 类 号：U223.61[交通运输工程—道路与铁道工程]