發(fā)布時(shí)間：2018-06-12 08:02

  本文選題：電力變壓器 + 繞組松動(dòng)變形��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：電力變壓器是電力系統(tǒng)中的重要設(shè)備,繞組松動(dòng)變形是變壓器故障中最為常見(jiàn)的故障類型之一。電力變壓器繞組松動(dòng)變形故障不能及時(shí)發(fā)現(xiàn),電力變壓器繞組的機(jī)械穩(wěn)定性將受到很大影響,可能會(huì)造成嚴(yán)重安全事故。如何及時(shí)有效地檢測(cè)出電力變壓器繞組松動(dòng)變形故障,對(duì)保障電力變壓器安全穩(wěn)定運(yùn)行具有重要意義。本文從電力變壓器繞組機(jī)械結(jié)構(gòu)穩(wěn)定性的角度出發(fā)對(duì)其進(jìn)行繞組故障檢測(cè),當(dāng)繞組發(fā)生松動(dòng)變形故障時(shí)其機(jī)械結(jié)構(gòu)也會(huì)發(fā)生相應(yīng)變化,此時(shí)電力變壓器繞組的模態(tài)參數(shù)與正常情況相比同樣會(huì)產(chǎn)生相應(yīng)改變,模態(tài)參數(shù)的變化可通過(guò)電力變壓器繞組振動(dòng)信號(hào)的頻響函數(shù)進(jìn)行檢測(cè)。模態(tài)參數(shù)隨著結(jié)構(gòu)體的改變而發(fā)生相應(yīng)變化,因此可通過(guò)對(duì)繞組參數(shù)的檢測(cè)與分析實(shí)現(xiàn)電力變壓器繞組故障檢測(cè)。首先,對(duì)電力變壓器繞組常見(jiàn)變形故障及其產(chǎn)生原因進(jìn)行了簡(jiǎn)要分析,在此基礎(chǔ)上總結(jié)了振動(dòng)分析法在電力變壓器繞組變形故障檢檢測(cè)中的應(yīng)用,同時(shí)對(duì)模態(tài)分析理論進(jìn)行簡(jiǎn)介,進(jìn)一步明確了利用振動(dòng)頻響法對(duì)模態(tài)參數(shù)進(jìn)行獲取可在電力變壓器繞組松動(dòng)變形故障檢測(cè)中進(jìn)行應(yīng)用。其次,進(jìn)行了電力變壓器繞組的數(shù)值模態(tài)分析即對(duì)電力變壓器繞組進(jìn)行有限元建模,分別建立了電力變壓器繞組正常工況以及松動(dòng)變形故障下的前四階模態(tài)振型。通過(guò)仿真模型,初步對(duì)電力變壓器繞組正常狀態(tài)以及松動(dòng)故障狀態(tài)下的模態(tài)參數(shù)中固有頻率的變化趨勢(shì)進(jìn)行了掌握。為進(jìn)一步了解電力變壓器繞組松動(dòng)故障的模態(tài)特性,在以50%Fn預(yù)緊力作為電力變壓器繞組松動(dòng)故障設(shè)置的基礎(chǔ)上開(kāi)展了不同松動(dòng)程度下的電力變壓器繞組固有頻率變化研究,通過(guò)預(yù)緊力的改變發(fā)現(xiàn)高階模態(tài)下的變壓器繞組松動(dòng)故障更為敏感,其固有頻率變化率更大。再次,為與前述有限元仿真研究相對(duì)應(yīng),搭建現(xiàn)場(chǎng)實(shí)體變壓器的繞組試驗(yàn)?zāi)B(tài)研究平臺(tái),分別對(duì)變壓器繞組正常與50%Fn預(yù)緊力松動(dòng)故障變形時(shí)進(jìn)行模態(tài)測(cè)試,獲取了相應(yīng)的振動(dòng)頻響曲線。最后從振動(dòng)頻響曲線中提取繞組模態(tài)參數(shù),以便通過(guò)模態(tài)參數(shù)的變化對(duì)電力變壓器繞組進(jìn)行故障診斷,提出了相應(yīng)的模態(tài)參數(shù)提取算法。在上述研究的基礎(chǔ)上分別對(duì)電力變壓器繞組正常與松動(dòng)故障時(shí)的仿真與實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比,通過(guò)仿真與試驗(yàn)二者固有頻率的對(duì)比不僅驗(yàn)證了 ANSYS仿真結(jié)果,同時(shí)明確了電力變壓器繞組松動(dòng)變形時(shí)振動(dòng)頻響信號(hào)的變化規(guī)律,為后續(xù)開(kāi)發(fā)基于繞組振動(dòng)頻響信號(hào)的電力變壓器繞組故障檢測(cè)系統(tǒng)奠定了基礎(chǔ)。
[Abstract]:Power transformer is an important equipment in power system. Loosening deformation of winding is one of the most common types of transformer faults. The loosening and deformation fault of power transformer windings can not be found in time, and the mechanical stability of power transformer windings will be greatly affected, which may cause serious safety accidents. How to detect the loosening deformation fault of power transformer winding in time and effectively is of great significance to ensure the safe and stable operation of power transformer. From the point of view of the mechanical structure stability of power transformer windings, this paper detects the winding faults, and the mechanical structure changes when the winding loosens and deforms. At this time the modal parameters of power transformer windings will also change in comparison with the normal conditions. The changes of modal parameters can be detected by the frequency response function of the vibration signals of power transformer windings. The modal parameters change with the change of the structure, so the fault detection of power transformer windings can be realized by detecting and analyzing the winding parameters. Firstly, the common deformation faults of power transformer windings and their causes are briefly analyzed, and the application of vibration analysis method in fault detection of power transformer windings is summarized. At the same time, the theory of modal analysis is briefly introduced, and the application of vibration frequency response method to obtain modal parameters can be used in the fault detection of loosening deformation of power transformer windings. Secondly, the numerical modal analysis of power transformer windings is carried out, that is, the finite element modeling of power transformer windings is carried out, and the first four modes of power transformer windings under normal working conditions and loose deformation faults are established respectively. Based on the simulation model, the variation trend of natural frequency in the modal parameters of power transformer windings under normal state and loose fault state is preliminarily grasped. In order to further understand the modal characteristics of power transformer winding loosening fault, the natural frequency change of power transformer winding with different loosening degree is studied on the basis of 50Fn pretightening force as the setting of power transformer winding loosening fault. It is found that the loosening fault of transformer windings is more sensitive and the change rate of natural frequency is larger. Thirdly, in order to correspond to the above-mentioned finite element simulation study, the experimental modal research platform of the field solid transformer winding is built, and the modal tests are carried out respectively when the transformer winding is normal and the 50Fn pretightening force loosening failure is deformed. The corresponding vibration frequency response curves are obtained. Finally, the modal parameters of the winding are extracted from the vibration frequency response curve in order to diagnose the fault of the power transformer windings through the variation of the modal parameters, and the corresponding modal parameters extraction algorithm is proposed. On the basis of the above research, the simulation and experiment results of power transformer windings under normal and loose faults are compared, and the results of ANSYS simulation are not only verified by the comparison of natural frequencies between simulation and test. At the same time, the variation rule of vibration frequency response signal when winding loosening and deformation of power transformer is defined, which lays a foundation for the subsequent development of power transformer winding fault detection system based on winding vibration frequency response signal.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM41

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