基于振动频响法的变压器绕组故障诊断试验研究

发布时间：2018-06-17 07:05

本文选题：变压器 + 绕组　；参考：《华北电力大学》2017年硕士论文

【摘要】：振动频率响应法是一种通过采集和分析变压器油箱表面振动信号来检测变压器状况的方法,其非侵入式和无电气连接检测方式是对传统电气参数监测方法的有力补充。本文以振动频率响应分析法作为研究方法,对变压器绕组进行了研究,通过理论分析和试验验证相结合的手段,研究了绕组在正常运行和发生故障时的振动特性。主要研究内容如下:变压器绕组变形与振动机理分析:分析变压器绕组和铁心的振动规律和相关影响因素,为研究振动法检测变压器绕组故障提供理论依据。变压器绕组机械动力学特性建模研究:采用大型有限元分析软件,建立变压器绕组的有限元分析模型,计算分析变压器绕组的振动响应特性,分析其与各种影响因素的相关性。另外,人为设置典型的变压器绕组故障,研究分析变压器绕组典型故障时的振动响应特性。变压器绕组振动模态测试研究:搭建变压器绕组模态测试平台,分别对绕组正常工况与典型故障下的振动模态进行测试分析。最后实体变压器的试验研究:以实体变压器为研究对象,对其绕组正常工况与典型故障下的绕组状态进行检测。得到试验结论:变压器绕组振动频响曲线与变压器绕组状态的改变密切相关,绕组振动扫频试验具有很好的可重复性。变压器绕组发生松动、变形等典型故障时,绕组振动频响曲线也随之发生明显变化,表现为频率的偏移和频响峰值的变化,其变化程度随绕组故障程度而异。本文试验中分别采用振动频响法和传统频响法对绕组预紧力降低、垫块的脱落、幅向和轴向轻微形变等故障进行对比检测分析,结果表明振动频响法与传统频响法相比较灵敏度更高。
[Abstract]:The vibration frequency response method is a method to detect the condition of transformer by collecting and analyzing the vibration signals on the surface of the transformer tank. Its non-invasive and non-electric connection detection method is a powerful supplement to the traditional monitoring methods of electrical parameters. In this paper, the method of vibration frequency response analysis is used as the research method, and the vibration characteristics of transformer windings under normal operation and failure are studied by means of theoretical analysis and test verification. The main research contents are as follows: analysis of transformer winding deformation and vibration mechanism: analysis of transformer winding and core vibration law and related factors to provide a theoretical basis for the study of vibration method to detect transformer winding fault. Modeling of mechanical dynamic characteristics of transformer windings: the finite element analysis model of transformer windings is established by using large-scale finite element analysis software. The vibration response characteristics of transformer windings are calculated and analyzed, and the correlation between them and various influencing factors is analyzed. In addition, the vibration response characteristics of typical transformer windings are studied and analyzed by artificial setting of typical transformer winding faults. Research on vibration mode testing of transformer windings: the vibration modes of transformer windings under normal working conditions and typical faults are tested and analyzed by setting up a transformer winding modal test platform. Finally, the experimental study of the solid transformer: taking the solid transformer as the research object, the windings under normal working conditions and typical faults are detected. It is concluded that the vibration frequency response curve of transformer winding is closely related to the change of transformer winding state, and the frequency sweep test of winding vibration has good repeatability. When some typical faults such as loosening and deformation of transformer windings occur, the frequency response curves of the windings also change obviously, which is shown by the frequency offset and the peak frequency response, and the variation degree varies with the winding fault degree. In this paper, the vibration frequency response method and the traditional frequency response method are used to detect and analyze the faults such as the reduction of the winding pretightening force, the shedding of the gasket, the slight deformation in amplitude and axial direction, etc. The results show that the vibration frequency response method is more sensitive than the traditional frequency response method.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM41

【参考文献】