摘要
杂散电流会侵蚀地铁沿线埋地金属管道和钢筋混凝土结构进而降低建筑物的强度和耐久性。现有的杂散电流分布模型由于多是单一列车驱动且边界条件为一个或两个变电站,存在模型结构简单且边界条件与实际情形有较大区别等缺陷,致使其仿真结果与实测值存在较大误差。文中将列车及变电所等效为直流源共同对地注入电流,再从杂散电流分布特性出发,基于契合实际状况下的“行车轨道—排流钢筋结构—金属网—大地土壤”四层地网结构方法,利用微元等值电路推出单注入源作用下大地电气量的分布模型,接着将各个单独注入源作用结果进行叠加,得到整条线路上电气量的分布模型。基于成都地铁线路数据,利用所提多列车杂散电流分布模型对全线杂散电流进行编程仿真,预测其在整条线路上的分布,对地铁杂散电流前期施工及后期防护提供参考。
Stray currents can erode buried metal pipes and reinforced concrete structures along the subway to reduce the strength and durability of the building.The existing stray current distribution model is mostly driven by a single train and the boundary conditions are one or two substations.There are defects such as simple model structure and large difference between boundary conditions and actual conditions.As a result,there is a large error between the simulation results and the measured values.Firstly,the train and the substation are equivalent to the DC source to inject current into the ground,and then,starting from the distribution characteristics of the stray current,the four-layer-to-earth network structure method of the“traveling track-drainage steel structure-metal mesh-earth soil”is adopted in accordance with the actual situation,and the micro-equivalent circuit is utilized to derive the distribution model of the electric quantity of earth under the action of a single injection source,and then,the results of the individual injection sources are superimposed to obtain the distribution model of the electric quantity on the whole line.Finally,based on the data of Chengdu subway line,the stray current distribution model of the multi-train is used to program and simulate the stray current of the whole line,and predict its distribution on the whole line,which provides reference for pre-construction and post-protection of subway stray current.
作者
澹台乐琰
韩肖清
王磊
袁铁江
Tantai Leyan;Han Xiaoqing;Wang Lei;Yuan Tiejiang(Shanxi Key Lab of Power System Operation and Control,Taiyuan University of Technology,Taiyuan 030024,China;School of Electrical Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《电测与仪表》
北大核心
2020年第22期7-16,共10页
Electrical Measurement & Instrumentation
基金
国家重点研发计划(2018YFB0904700)
山西省科技重大专项项目(20181102028)。
关键词
杂散电流
单/多注入源
建模
行车轨道
牵引供电系统
stray current
single/multiple injection source
modeling
driving track
traction power supply system
