轨道对地绝缘局部损坏时回流系统的参数变化研究  

Parameter Variations of Reflow System in Local Rail-earth Insulation Damage

作　　者：陈桁[1] 

机构地区：[1]中铁二院工程集团有限责任公司

出　　处：《城市轨道交通研究》2015年第2期34-38,共5页Urban Mass Transit

摘　　要：随着城市轨道交通运营线路规模的增加及运营年限的增加,杂散电流腐蚀问题已逐渐突出。回流系统中局部潮湿或油污等原因,会出现局部绝缘损坏,这将增大杂散电流的泄漏及腐蚀。利用半球形电极电场分析轨道对地绝缘局部损坏时的杂散电流泄漏情况,建立了直流牵引供电系统离散模型;并通过仿真分析了轨道对地局部绝缘损坏时,回流系统杂散电流、轨道电位等参数的变化规律,可为绝缘损坏的检测和防护提供基础支持。With the increase of urban rail transit line operation scale and operating period, stray current corrosion problem has become more prominent. Local rail-earth insulation damage will appear with local damp and greasy dirt in reflow system, which causes serious stray current leakage and corrosion. In this paper, the hemispherical electric field is used to analyze stray current leakage, and a discrete model of DC traction power system is established. The variation law of stray current and rail potential is analyzed when the local insulation damage appears, in order to provide a basis for insulation damage detection and protection.

关 键 词：城市轨道交通 半球形电极电场 绝缘局部损坏点 离散模型 

分 类 号：U284.26[交通运输工程—交通信息工程及控制]