牵引变压器绕组改进型频率响应建模与径向变形故障分析

Improved FRA modeling and radial deformation fault analysis of traction transformer windings

以一台QYS-R-(31500+25000)/220牵引变压器为研究对象,提出一种基于集总参数电路的考虑绕组间全电容参数的改进型频率响应模型,通过与实测曲线进行对比,验证了模型正确性;然后对变压器的牵引绕组和高压绕组分别进行了向内的曲翘变形和向外的鼓包变形这2种径向变形故障仿真,重点分析了不同变形故障对电容参数的影响;最后通过对变化的频率响应曲线进行分析。分析结果表明:牵引变压器牵引绕组和高压绕组发生径向变形故障时,特征诊断频带不同,但在各自的特征频带内频响曲线呈现相同的变化规律,即随着故障程度的增加,频率响应曲线向低频方向移动,并且幅值不断增大。

Taking a QYS-R-(31500+25000)/220 traction transformer as the research object,an improved frequency response model based on lumped parameter circuit considering full capacitance parameters of windings is proposed. The correctness of the proposed model is verified by comparing with the measured curves. Then two kinds of radial deformation faults,i.e. inward warpage deformation and outward drum deformation,are respectively simulated for the traction winding and the high voltage winding of transformer. The influence of different deformation faults on capacitance parameters is mainly analyzed. The results show that when the traction winding and high voltage winding have radial deformation faults,their characteristic diagnostic frequency bands are different,but in their respective characteristic frequency bands,the changes of frequency response curves are the same,that is,with the increase of the fault degree,the frequency response curves move towards low frequency,and the amplitude increases.