本文關(guān)鍵詞：變壓器繞組變形的在線監(jiān)測研究　出處：《北京交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 變壓器 繞組變形 在線監(jiān)測 傳遞函數(shù) 相關(guān)系數(shù) 診斷 LabVIEW

【摘要】：電力變壓器是電力系統(tǒng)中的重要組成部分,一旦發(fā)生改障將會造成重大的經(jīng)濟(jì)損失甚至是嚴(yán)重后果。繞組變形是影響變壓器安全運行的重要因素,進(jìn)行故障診斷可提高其運行可靠性。論文工作研究了變壓器繞組的傳遞函數(shù)特性,并應(yīng)用于在線監(jiān)測,為變壓器繞組變形的在線監(jiān)測研究打下了理論基礎(chǔ)。 建立了變壓器繞組的仿真模型,綜合考慮了變壓器繞組的損耗和各線餅間的互感。以某臺連續(xù)式單繞組變壓器為算例,介紹了變壓器繞組等值電路模型中的元件參數(shù)的計算方法和等效電路模型的建立過程。研究了仿真分析繞組變形的結(jié)構(gòu)參數(shù)法,分析不同形式和程度的變形引起的繞組結(jié)構(gòu)和尺寸變化,根據(jù)變形情況重新計算等效電路中的參數(shù)。 基于對變壓器繞組變形分析的傳遞函數(shù)法基本原理,利用不同時間的繞組傳遞函數(shù)曲線的相關(guān)系數(shù)ρxy和差值的均方根值Exy,作為診斷繞組變形的判據(jù)。 仿真分析了變壓器繞組發(fā)生單餅和多餅不同類型、不同程度變形時對傳遞函數(shù)的影響。論證了可將變形前后的ρxy和Ex,值作為特征量對繞組變形程度進(jìn)行判斷,并給出了相應(yīng)的判斷繞組輕微、中等和嚴(yán)重變形的區(qū)分閾值。研究了根據(jù)傳遞函數(shù)極點數(shù)目把傳遞函數(shù)曲線分為低頻、中頻、高頻進(jìn)行頻域分段分析的方法,分別在全頻域和各分段計算相應(yīng)的ρx,和Exy,值,綜合兩者對繞組狀態(tài)進(jìn)行判斷。成功的將仿真得到的結(jié)果應(yīng)用到實際中,仿真模型及其分析通過了試驗驗證,為繞組變形的在線監(jiān)測提供了理論基礎(chǔ)和算法依據(jù)。 在仿真和實驗研究的基礎(chǔ)上,得到了變壓器繞組變形在線監(jiān)測的方法,通過在線比較繞組傳遞函數(shù)曲線的方法來實現(xiàn)對繞組變形的在線監(jiān)測。對實際變壓器進(jìn)行在線實驗研究,驗證了方法的可行性,為變壓器繞組變形的在線監(jiān)測提供了理論支持。 利用LabVIEW軟件平臺,設(shè)計并實施了基于虛擬儀器的變壓器繞組變形在線監(jiān)測系統(tǒng),具備在不改變一次設(shè)備接線方式的情況下實時不間斷監(jiān)測的能力,實現(xiàn)預(yù)警和報警。在線監(jiān)測系統(tǒng)同時監(jiān)測變壓器工作電流,如果發(fā)生短路或過負(fù)荷現(xiàn)象,系統(tǒng)可以自動加強(qiáng)監(jiān)測密度,具有一定的智能性。
[Abstract]:Power transformer is an important part of power system. Once the failure occurs, it will cause great economic losses and even serious consequences. Winding deformation is an important factor affecting the safe operation of transformers. Fault diagnosis can improve the reliability of transformer windings. The transfer function characteristics of transformer windings are studied and applied to on-line monitoring, which lays a theoretical foundation for on-line monitoring of transformer winding deformation. The simulation model of transformer windings is established, and the losses of transformer windings and mutual inductance between wires are considered synthetically. A continuous single-winding transformer is taken as an example. This paper introduces the calculation method of element parameters in the equivalent circuit model of transformer windings and the process of establishing equivalent circuit model, and studies the structural parameter method for simulation analysis of winding deformation. The structure and size changes of windings caused by different forms and degrees of deformation are analyzed, and the parameters of equivalent circuits are recalculated according to the deformation. Based on the basic principle of transfer function method for analysis of transformer winding deformation, the correlation coefficient 蟻 XY of different time winding transfer function curve and the root mean square value of difference value Exy are used. As a criterion for diagnosing winding deformation. The effect on transfer function of transformer windings with different types and degrees of deformation is analyzed by simulation. It is proved that 蟻 XY and Ex before and after deformation can be changed. The value is used as the characteristic value to judge the degree of winding deformation, and the corresponding threshold to judge the slight, moderate and severe deformation of the winding is given. The transfer function curve is divided into low frequency according to the number of poles of the transfer function. In the method of if and HF, the corresponding 蟻 x, and exy, values are calculated in the full frequency domain and in each segment, respectively. The simulation results are successfully applied to practice, and the simulation model and its analysis are verified by experiments. It provides theoretical basis and algorithm basis for on-line monitoring of winding deformation. On the basis of simulation and experimental research, the on-line monitoring method of transformer winding deformation is obtained. On-line monitoring of winding deformation is realized by on-line comparison of winding transfer function curves, and the feasibility of the method is verified by on-line experimental research on actual transformer. It provides theoretical support for on-line monitoring of transformer winding deformation. An on-line transformer winding deformation monitoring system based on virtual instrument is designed and implemented based on LabVIEW software platform. It has the ability of real-time and uninterrupted monitoring without changing the connection mode of primary equipment to realize early warning and alarm. The on-line monitoring system monitors transformer working current simultaneously if short circuit or overload occurs. The system can automatically strengthen the monitoring density, and has certain intelligence.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM41

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