本文選題：變壓器 + 漏磁場��； 參考：《華北電力大學》2017年碩士論文

【摘要】：在大容量變壓器中,負載電流產生的漏磁通非常大,這些漏磁通穿過繞組空道沿著鐵心夾件、主柱鐵心或經過油箱形成閉合回路,漏磁通通過鐵磁性材料時,形成眾多渦流,產生渦流損耗,并且散發(fā)出熱量。無論這些損耗還是熱量,對變壓器都是無無益的,不但會降低變壓器的效率,還會破壞變壓器的絕緣,影響變壓器的安全運行,縮短變壓器的使用壽命。漏磁通在變壓器金屬結構件中形成的損耗,稱為雜散損耗,油箱的渦流損耗占雜散損耗的大部分。變壓器的雜散損耗不可避免,且隨容量的增長而增加。工程上研究雜散損耗,一方面控制其在允許的范圍內,滿足用戶要求;另一方面控制漏磁通密度,避免局部過熱,保證變壓器的安全運行。經過專家和學者的研究試驗,工程中最有效的減少金屬結構件的漏磁通方法是,在漏磁通密集的地方安裝屏蔽板或開漏磁槽。油箱的結構對雜散損耗也有一定影響,當變壓器的參數不是常規(guī)時,設計者需要分析金屬結構件和油箱的漏磁場,避免局部過熱。基于變壓器漏磁場對上述問題的影響,因此需要全面的分析。本文是從以下方面對課題進行論述的:通過研究電磁場的基本理論,導出適用于計算的電磁場方程。介紹了本課題計算用到的有限元法、建模軟件Pro/ENGINEER和電磁場仿真計算軟件Mag Net。還進一步分析了漏磁場產生的原因和危害。本文以一臺SFP-410000/220變壓器為例,采利用Mag Net軟件對該變壓器進行漏磁場計算,通過分析金屬結構件的磁通密度和雜散損耗密度,得出結論不會出現過熱點。為了進一步探究油箱頂部角度的改變帶來的漏磁效應,論文分析了高壓側35度箱蓋和45度箱蓋的漏磁場。通過比較兩種箱蓋角度的漏磁帶來的雜散損耗和熱效應,得出了45度的箱蓋雜散損耗略大于35度箱蓋,但并未形成過熱點。
[Abstract]:In large capacity transformers, the leakage flux generated by the load current is very large. These flux leakage fluxes pass through the windings along the iron core, and the core of the main column or through the oil tank forms a closed loop. When the leakage flux passes through the ferromagnetic material, a large number of eddy currents are formed.Causes eddy current loss and emits heat.Whether these losses or heat are not beneficial to the transformer, it will not only reduce the efficiency of the transformer, but also damage the insulation of the transformer, affect the safe operation of the transformer, shorten the service life of the transformer.The loss of flux leakage in the metal structure of transformer is called stray loss, and the eddy current loss of fuel tank accounts for most of the stray loss.The stray loss of transformer is inevitable and increases with the increase of capacity.On the one hand, the stray loss can be controlled within the allowable range to meet the requirements of the users; on the other hand, the flux leakage density will be controlled to avoid local overheating and ensure the safe operation of the transformer.Through the research and test by experts and scholars, the most effective method to reduce the leakage flux of metal structure in engineering is to install shielding plate or flux-leakage slot in the place where the flux leakage is dense.The structure of fuel tank also has a certain influence on stray loss. When the transformer parameters are not conventional, the designer needs to analyze the leakage magnetic field of metal structure and fuel tank to avoid local overheating.Based on the influence of transformer flux leakage on the above problems, a comprehensive analysis is needed.This paper discusses the subject from the following aspects: by studying the basic theory of electromagnetic field, the equation of electromagnetic field suitable for calculation is derived.The finite element method, modeling software Pro/ENGINEER and electromagnetic field simulation software Mag net are introduced in this paper.The cause and harm of leakage magnetic field are also analyzed.Taking a SFP-410000/220 transformer as an example, the magnetic flux leakage of the transformer is calculated by using Mag Net software. By analyzing the flux density and stray loss density of metal structure, it is concluded that there is no hot spot.In order to further explore the magnetic leakage effect caused by the change of the top angle of the tank, the magnetic leakage field of the 35 degree tank cap and the 45 degree tank cover on the high pressure side are analyzed in this paper.By comparing the stray loss and thermal effect of two kinds of leaky tape with different cover angle, it is concluded that the stray loss of 45 degree box cover is slightly greater than that of 35 degrees box cover, but no hot spot has been formed.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM41

【參考文獻】

相關期刊論文 前10條

1 李龍女;李巖;井永騰;張博;;電力變壓器漏磁場與雜散損耗計算的研究[J];電工技術學報;2013年S2期

2 郭滿生;;大容量電力變壓器雜散損耗的數值分析計算[J];變壓器;2010年11期

3 劉東升;張俊杰;趙峰;張喜樂;程志光;;特高壓特大容量變壓器三維渦流場計算和防止局部過熱技術的研究[J];變壓器;2009年09期

4 趙峰;王凱;張俊杰;劉東升;;大容量變壓器局部過熱問題分析[J];變壓器;2009年07期

5 張安紅,劉軍;180MVA/220kV電力變壓器負載損耗超標分析[J];變壓器;2004年08期

6 徐勇,周臘吾,朱英浩,劉忠邵;變壓器漏磁場的分析[J];變壓器;2003年09期

7 王建民,程志光,張元錄,劉建新;模擬低磁鋼板三維渦流損耗的模型試驗與分析[J];華北電力大學學報;1997年03期

8 王建民,周文濤;大型電力變壓器漏磁場及附加損耗的研究[J];華北電力大學學報;1997年01期

9 李文平;;大型變壓器的不平衡安匝對橫向漏磁的影響[J];變壓器;1991年12期

10 朱英浩;;第32屆國際大電網會議SC12學術委員會變壓器專業(yè)討論內容綜述[J];變壓器;1988年12期

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