基于FRA的牵引变压器绕组变形仿真与应用研究

摘要

牵引变压器绕组变形将严重影响牵引供电系统的安全运行,频率响应分析法是诊断绕组变形的一种有效方法.本文以北同蒲线某牵引变电所SF2-QY-25000-110阻抗匹配平衡牵引变压器为研究对象,建立非均匀分布参数模型,并进行Matlab/Simulink仿真分析.结果表明:绕组变形会引起等效模型相关电参数的改变,可根据变形后所测频响曲线与原始曲线之间的差异判断绕组发生变形的位置、相位、类别等信息.通过频率响应分析法诊断因短路故障引起的绕组变形实例,验证了该模型和方法在工程上的可行性.%The winding deformation of traction transformer will seriously affect the safe running of the traction power system.Frequency response analysis is an effective method to diagnose winding deformation.In this paper, with the SF2-QY-25000-110 impedance-matching balanced traction transformer of a certain traction substation of North Datong-Puzhou railway being taken as the research object, the non-uniform distributed parameter model was established, and the Matlab/Simulink simulation experiment was carried out.Results showed that the winding deformation caused the change of related electrical parameters of the equivalent model.According to the difference between the frequency response curve measured after the deformation and theoriginal curve, the location, phase, category and some other information about the deformation of the winding can be determined.The example of short circuit fault-induced winding deformation diagnosed using the frequency response analysis method verified the feasibility and the superiority of this model and method in engineering.