【摘要】：隨著我國(guó)經(jīng)濟(jì)的迅速發(fā)展,人們對(duì)電能的需求與日俱增,電網(wǎng)規(guī)模和發(fā)電機(jī)的單機(jī)容量隨之不斷增加,而電力變壓器作為發(fā)電廠和變電所的主要設(shè)備,隨著變壓器容量的增加,變壓器漏磁場(chǎng)隨之增大,由此產(chǎn)生的各種附加損耗增多,并帶來(lái)可能出現(xiàn)局部過熱等問題,降低變壓器的絕緣性能,最終影響變壓器的安全穩(wěn)定運(yùn)行以及使用壽命。所以,對(duì)變壓器的損耗分布以及溫度場(chǎng)的深入研究是十分重要的。本文首先對(duì)電磁場(chǎng)和變壓器漏磁場(chǎng)的相關(guān)理論進(jìn)行了簡(jiǎn)單的介紹,以一臺(tái)SZ10-120000/220三相五柱式電力變壓器為例,建立了求解變壓器漏磁場(chǎng)的三維模型,利用有限元軟件仿真求出變壓器漏磁場(chǎng)的分布,并在此基礎(chǔ)上,通過計(jì)算每根導(dǎo)線的渦流損耗以及各金屬結(jié)構(gòu)件的渦流損耗,進(jìn)而得到繞組和各結(jié)構(gòu)件的渦流損耗分布情況和總的損耗值,并計(jì)算分析了油箱和夾件在加設(shè)磁屏蔽情況下的渦流損耗分布,為改善金屬結(jié)構(gòu)件渦流損耗的措施指明了方向;最后利用FLUENT軟件建立了求解電力變壓器溫度場(chǎng)和油流場(chǎng)的二維模型,得到了變壓器的溫度場(chǎng)和流體場(chǎng)的分布,并仿真對(duì)比了加設(shè)與不加擋油板情況下的溫度場(chǎng)和油流場(chǎng)分布,結(jié)果表明增設(shè)擋油板為改善變壓器的流場(chǎng)及溫度場(chǎng)分布有一定作用。通過對(duì)電力變壓器漏磁場(chǎng)、繞組以及金屬結(jié)構(gòu)件的渦流損耗的計(jì)算和分析,得到了繞組和金屬結(jié)構(gòu)件的渦流損耗分布情況以及變壓器溫度場(chǎng)分布,能為工程上更合理的設(shè)計(jì)以及結(jié)構(gòu)的優(yōu)化提供一定指導(dǎo)意義。
[Abstract]:With the rapid development of economy in our country, the demand for electric energy is increasing day by day, the scale of power grid and the single machine capacity of generator are increasing. As the main equipment of power plant and substation, power transformer is increasing with the increase of transformer capacity. With the increase of leakage magnetic field of transformers, various additional losses are increased, and some problems such as local overheating may occur, which will reduce the insulation performance of transformers and ultimately affect the safe and stable operation and service life of transformers. Therefore, it is very important to study the loss distribution and temperature field of transformer. In this paper, the theory of electromagnetic field and leakage magnetic field of transformer is introduced briefly. Taking a SZ10-120000/220 three-phase five-column power transformer as an example, a three-dimensional model for solving leakage magnetic field of transformer is established. The distribution of leakage magnetic field of transformer is simulated by finite element software. On the basis of this, the eddy current loss of each wire and the eddy current loss of each metal structure are calculated. The eddy current loss distribution and the total loss value of the windings and structural parts are obtained, and the eddy current loss distribution of the oil tank and the clamping parts under the condition of magnetic shielding is calculated and analyzed, which points out the direction for improving the eddy current loss of the metal structure parts. Finally, a two-dimensional model for solving the temperature field and oil flow field of power transformer is established by using FLUENT software, and the distribution of temperature field and fluid field of transformer is obtained, and the distribution of temperature field and oil flow field under the condition of adding and without oil retaining plate is simulated and compared. The results show that the addition of oil retaining plate can improve the distribution of flow field and temperature field of transformer. Through the calculation and analysis of the leakage magnetic field of power transformer, the eddy current loss of winding and metal structure, the distribution of eddy current loss of winding and metal structure and the distribution of transformer temperature field are obtained. It can provide some guidance for more reasonable design and optimization of structure in engineering.
【學(xué)位授予單位】：哈爾濱理工大學(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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本文編號(hào)：2313201