城市轨道交通钢轨扣件对地绝缘组成及影响因素研究
|
摘要
轨地过渡电阻降低是城市轨道交通系统中杂散电流产生的重要原因。建立了钢轨扣件整体仿真模型,分析了扣件组表面电阻的组成及分布,利用Ansoft软件仿真研究了不同污层电导率下的表面电阻值,以及厚度和污秽分布情况对扣件表面电阻的影响。研究成果揭示了轨地绝缘性能下降的主要原因:表面电阻与污层电导率呈线性关系,一般污秽情况下扣件表面电阻远小于体电阻;随着污秽层厚度的增加,表面电阻值呈非线性下降趋势;随着运行年限的增加,污秽进入扣件组器件的夹缝中,表面电阻值会降低。
Track-to-earth resistance reduction is an important factor that causes the stray current in urban rail transit system.To resolve the problem,an integral simulation model of rail fastener is established,which is used to analyze the composi-tion and distribution of fastener surface resistance. Then,the surface resistance under the conductivity of different pollution layers,the influence of thickness and distribution of pollution layers on the surface resistance are studied by using the Ansoft simulation software. The results show that the surface resis-tance reduction is linearly related to the pollution layer con-ductivity. In general, the fastener surface resistance is much smaller than the bulk resistance,but with the increase of thick-ness in the pollution layer,the surface resistance will show a nonlinear downward trend. Following the increase of operation years,the value of surface resistance will decrease because the filth gets into the cracks of fastener group.
Track-to-earth resistance reduction is an important factor that causes the stray current in urban rail transit system.To resolve the problem,an integral simulation model of rail fastener is established,which is used to analyze the composi-tion and distribution of fastener surface resistance. Then,the surface resistance under the conductivity of different pollution layers,the influence of thickness and distribution of pollution layers on the surface resistance are studied by using the Ansoft simulation software. The results show that the surface resis-tance reduction is linearly related to the pollution layer con-ductivity. In general, the fastener surface resistance is much smaller than the bulk resistance,but with the increase of thick-ness in the pollution layer,the surface resistance will show a nonlinear downward trend. Following the increase of operation years,the value of surface resistance will decrease because the filth gets into the cracks of fastener group.
引文
[1]秦峰,朱祥连,奚杰,等.城市轨道交通设施杂散电流的防护[J].机电工程,2013(1):102.
[2]张泽萌.地铁杂散电流防护措施的研究[D].成都:西南交通大学,2015.
[3]蒋雪峰,邱忠才,孟军,等.对地铁中杂散电流泄漏造成腐蚀问题的探索[J].中国科技信息,2009(2):264.
[4]许建国.浅谈杂散电流腐蚀机理及防护措施[J].铁道机车车辆,2005(3):61.
[5] LEE C H. Evaluation of the maximum potential rise in Taipei rail transit systems[J]. IEEE Transactions on Power Delivery,2005,20(2):1379.
[6] CHARALAMBOUS C,COTTON I. Influence of soil structures on corrosion performance of floating_DC transit systems[J].Electric Power Applications,2007,1(1):9.
[7]蔡力,王建国,樊亚东,等.地铁走行轨对地过渡电阻杂散电流分布的影响[J].高电压技术,2015(11):3604.
[8]周晓军,高波.地铁迷流对钢筋混凝土中钢筋腐蚀的试验研究[J].铁道学报,1999(5):99.
[9]胡云进,钟振,方镜平.地铁杂散电流场的有限元模拟[J].中国铁道科学,2011(6):129.
[10]杨迪.城市轨道交通杂散电流实验系统设计与仿真[D].成都:西南交通大学,2013.
[11]庞原冰,李群湛,刘炜,等.基于电场的地铁杂散电流模型研究[J].城市轨道交通研究,2008(2):27.
[12]宋毅.绝缘子表面污层电导率的影响因素研究[J].高压电器,2014,50(10):102.
[2]张泽萌.地铁杂散电流防护措施的研究[D].成都:西南交通大学,2015.
[3]蒋雪峰,邱忠才,孟军,等.对地铁中杂散电流泄漏造成腐蚀问题的探索[J].中国科技信息,2009(2):264.
[4]许建国.浅谈杂散电流腐蚀机理及防护措施[J].铁道机车车辆,2005(3):61.
[5] LEE C H. Evaluation of the maximum potential rise in Taipei rail transit systems[J]. IEEE Transactions on Power Delivery,2005,20(2):1379.
[6] CHARALAMBOUS C,COTTON I. Influence of soil structures on corrosion performance of floating_DC transit systems[J].Electric Power Applications,2007,1(1):9.
[7]蔡力,王建国,樊亚东,等.地铁走行轨对地过渡电阻杂散电流分布的影响[J].高电压技术,2015(11):3604.
[8]周晓军,高波.地铁迷流对钢筋混凝土中钢筋腐蚀的试验研究[J].铁道学报,1999(5):99.
[9]胡云进,钟振,方镜平.地铁杂散电流场的有限元模拟[J].中国铁道科学,2011(6):129.
[10]杨迪.城市轨道交通杂散电流实验系统设计与仿真[D].成都:西南交通大学,2013.
[11]庞原冰,李群湛,刘炜,等.基于电场的地铁杂散电流模型研究[J].城市轨道交通研究,2008(2):27.
[12]宋毅.绝缘子表面污层电导率的影响因素研究[J].高压电器,2014,50(10):102.