基于单端行波法的铁路接触网故障测距技术研究

Research on Railway Catenary Fault Ranging Technique Based on Single-ended Traveling Wave Method

现阶段应用于铁路接触网线路故障测距的方法大部分为阻抗法推导而来,影响其故障测距精度的因素较多,尤其是系统的运行方式及故障点短路阻抗,在进行多分支故障测距时可能出现无法区分是主线还是支线故障的情况,因此接触网故障测距技术的升级显得极为重要。为此,引入行波法故障测距技术,对单端行波法故障测距技术进行了研究,利用ATP-EMTP仿真软件构建接触网线路等效模型,采用模极值点的方式进行单端测距波头标定,仿真不同故障情况下单端测距算法的可行性;此外,利用监测装置结合仿真情况对接触网线路进行现场故障测距验证,结果表明单端行波法故障测距技术具有较高的精确性与稳定性。

Currently,the methods used for fault ranging in railway catenary overhead lines are mostly derived from impedance-based approaches.These methods have various factors that affect their accuracy,particularly the operation mode of the system and the short-circuit impedance at the fault point.During fault ranging involving multiple branches,it is often challenging to distinguish whether the fault is on the mainline or a branch line.Therefore,upgrading the fault ranging technique for catenary is of utmost importance.In this regard,the traveling wave fault ranging technique is introduced,and the single-ended traveling wave method is researched.Using ATP-EMTP simulation software,an equivalent model of the catenary overhead lines is constructed.The calibration of the single-ended distance measurement wavefront is carried out using the method of maximum modulus points.The feasibility of the single-ended ranging algorithm under different fault conditions is simulated.Additionally,field fault ranging of the catenary overhead lines are validated using monitoring devices and simulation results.The outcomes demonstrate that the single-ended traveling wave fault ranging technique exhibits high accuracy and stability.