本文選題：變壓器 + 繞組��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：振動(dòng)頻率響應(yīng)法是一種通過(guò)采集和分析變壓器油箱表面振動(dòng)信號(hào)來(lái)檢測(cè)變壓器狀況的方法,其非侵入式和無(wú)電氣連接檢測(cè)方式是對(duì)傳統(tǒng)電氣參數(shù)監(jiān)測(cè)方法的有力補(bǔ)充。本文以振動(dòng)頻率響應(yīng)分析法作為研究方法,對(duì)變壓器繞組進(jìn)行了研究,通過(guò)理論分析和試驗(yàn)驗(yàn)證相結(jié)合的手段,研究了繞組在正常運(yùn)行和發(fā)生故障時(shí)的振動(dòng)特性。主要研究?jī)?nèi)容如下:變壓器繞組變形與振動(dòng)機(jī)理分析:分析變壓器繞組和鐵心的振動(dòng)規(guī)律和相關(guān)影響因素,為研究振動(dòng)法檢測(cè)變壓器繞組故障提供理論依據(jù)。變壓器繞組機(jī)械動(dòng)力學(xué)特性建模研究:采用大型有限元分析軟件,建立變壓器繞組的有限元分析模型,計(jì)算分析變壓器繞組的振動(dòng)響應(yīng)特性,分析其與各種影響因素的相關(guān)性。另外,人為設(shè)置典型的變壓器繞組故障,研究分析變壓器繞組典型故障時(shí)的振動(dòng)響應(yīng)特性。變壓器繞組振動(dòng)模態(tài)測(cè)試研究:搭建變壓器繞組模態(tài)測(cè)試平臺(tái),分別對(duì)繞組正常工況與典型故障下的振動(dòng)模態(tài)進(jìn)行測(cè)試分析。最后實(shí)體變壓器的試驗(yàn)研究:以實(shí)體變壓器為研究對(duì)象,對(duì)其繞組正常工況與典型故障下的繞組狀態(tài)進(jìn)行檢測(cè)。得到試驗(yàn)結(jié)論:變壓器繞組振動(dòng)頻響曲線與變壓器繞組狀態(tài)的改變密切相關(guān),繞組振動(dòng)掃頻試驗(yàn)具有很好的可重復(fù)性。變壓器繞組發(fā)生松動(dòng)、變形等典型故障時(shí),繞組振動(dòng)頻響曲線也隨之發(fā)生明顯變化,表現(xiàn)為頻率的偏移和頻響峰值的變化,其變化程度隨繞組故障程度而異。本文試驗(yàn)中分別采用振動(dòng)頻響法和傳統(tǒng)頻響法對(duì)繞組預(yù)緊力降低、墊塊的脫落、幅向和軸向輕微形變等故障進(jìn)行對(duì)比檢測(cè)分析,結(jié)果表明振動(dòng)頻響法與傳統(tǒng)頻響法相比較靈敏度更高。
[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.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM41

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