轨地局部绝缘损坏时回流参数变化的研究

Reflow Parameter Variations of Local Rail-Earth Insulation Damage in Urban Rail Transit System

由于城市轨道交通的运营年限日益增加以及线路越来越多,解决杂散电流的腐蚀问题已经刻不容缓。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地绝缘局部损坏的杂散电流泄漏情况,对直流牵引供电系统搭建了离散模型,并通过仿真得到了当轨地局部绝缘损坏时,回流系统泄漏电流、轨道电流、杂散电流等数据的变化规律,可以以此为基础进行杂散电流的腐蚀防护和绝缘损坏的检测。

With the general increase in urban rail transit line operations and operation period,stray current corrosion problem has become more apparent.Local insulation damage will appear when local damp and greasy dirt in reflow system,problem of stray current leakage and corrosion will be serious.In this paper,hemispherical electric field is used to analyze stray current leakage,discrete model of DC traction power system is established.The variation of stray current and rail potential is analyzed when the local insulation damage appeared,and this will provide a basis for insulation damage detection and protection.