本文關(guān)鍵詞： 箱式變電站 通風(fēng)散熱 CFD數(shù)值模擬 優(yōu)化設(shè)計(jì)　出處：《沈陽工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國經(jīng)濟(jì)的不斷發(fā)展,輸電電網(wǎng)不斷擴(kuò)大,城網(wǎng)變電所迅速覆蓋市區(qū)。城網(wǎng)變電所位于市中心,承擔(dān)重要的供電任務(wù),并向小型化、節(jié)地、節(jié)能發(fā)展,因此帶來箱式變電站的迅猛發(fā)展。由于箱式變電站的結(jié)構(gòu)特點(diǎn),其極易出現(xiàn)因溫升過高而導(dǎo)致的設(shè)備安全問題,在夏季溫度較高時(shí)更加危險(xiǎn)。因此需要合理的通風(fēng)散熱方案,以保證主變壓器的安全運(yùn)行。本文以某箱式變電站為研究對象,采用試驗(yàn)、理論分析和數(shù)值仿真相結(jié)合的方法,基于CFD數(shù)值模擬技術(shù),通過磁-流-熱耦合分析計(jì)算,對箱式變電站整體的通風(fēng)換熱效果進(jìn)行了仿真分析,本文主要針對下面幾個(gè)問題進(jìn)行分析:(1)分析箱式變電站內(nèi)部損耗組成;通過有限元分析軟件對7600kVA干式變壓器進(jìn)行電磁計(jì)算,分析其主磁通及短路阻抗、漏磁場分布,并與試驗(yàn)值進(jìn)行對比;分析其鐵心損耗分布、負(fù)載損耗及附加損耗分布;(2)基于傳熱學(xué)與流體動(dòng)力學(xué)理論,對變壓器內(nèi)部、高低壓控制柜內(nèi)部生熱、散熱過程進(jìn)行理論分析。針對一臺1600kVA干式變壓器在無外殼及有外殼兩種工況下的溫度場及流體場分布進(jìn)行數(shù)值仿真,并將仿真值與試驗(yàn)值進(jìn)行對比,對計(jì)算方法的有效性進(jìn)行驗(yàn)證;(3)以某箱式變電站為設(shè)計(jì)基礎(chǔ),建立合理的數(shù)學(xué)模型和物理模型,通過對其速度場和溫度場進(jìn)行數(shù)值模擬,分析不同出風(fēng)口速度對于變壓器溫升以及整體通風(fēng)散熱效果的影響。在原模型基礎(chǔ)上,分別在箱變變壓器室底部、箱變棚頂增加通風(fēng)孔,分析變壓器溫升、箱變整體溫度場和流體場分布,為已建的箱式變電站的通風(fēng)散熱及空氣流動(dòng)提供理論基礎(chǔ);固定出風(fēng)口位置,分別改變進(jìn)風(fēng)口位置以及進(jìn)風(fēng)口高度,研究箱變內(nèi)部溫度場和流體場的變化規(guī)律;對比各方案溫度場、速度場分布,分析其分別對于通風(fēng)散熱的影響。總結(jié)出合理的節(jié)能設(shè)計(jì)方案,為設(shè)計(jì)人員提出參照。
[Abstract]:With the development of economy in our country, the power transmission network is expanding, and the urban network substation covers the urban area rapidly. The urban network substation is located in the center of the city, undertakes the important power supply task, and develops towards miniaturization, land saving and energy saving. As a result, the rapid development of box-type substation, because of the structural characteristics of the box substation, it is easy to occur because of the high temperature rise caused by the equipment safety problems. In order to ensure the safe operation of the main transformer, it is more dangerous in summer when the temperature is higher. Therefore, a reasonable ventilation and heat dissipation scheme is needed to ensure the safe operation of the main transformer. In this paper, a box substation is taken as the research object and the test is adopted. The method of combining theoretical analysis and numerical simulation, based on CFD numerical simulation technology, through magnetic-fluid-heat coupling analysis and calculation, the overall ventilation heat transfer effect of box substation is simulated and analyzed. This paper mainly analyzes the following several problems: 1) analyzing the internal loss composition of the box substation; The electromagnetic calculation of 7600kVA dry transformer is carried out by finite element analysis software. The main flux, short circuit impedance, leakage magnetic field distribution are analyzed and compared with the test results. The distribution of core loss, load loss and additional loss are analyzed. Based on the theory of heat transfer and fluid dynamics, heat is generated inside the transformer and inside the high and low voltage control cabinet. The numerical simulation of temperature field and fluid field of a 1600kVA dry transformer under two working conditions without shell and shell was carried out. The validity of the calculation method is verified by comparing the simulation value with the experimental value. Based on the design of a box substation, a reasonable mathematical and physical model is established, and its velocity field and temperature field are simulated numerically. The effect of different outlet velocity on temperature rise of transformer and overall ventilation heat dissipation effect is analyzed. Based on the original model, the ventilation holes are added at the bottom of the box transformer chamber and the roof of the box variable shed is added, and the transformer temperature rise is analyzed. The whole temperature field and fluid field distribution of box transformer substation provide the theoretical basis for ventilation, heat dissipation and air flow of the built box substation. At the same time, fixed the outlet position, changed the inlet position and the inlet height, studied the variation law of temperature field and fluid field inside the box; By comparing the distribution of temperature field and velocity field of each scheme, the influence of temperature field and velocity field on ventilation and heat dissipation is analyzed, and the reasonable energy saving design scheme is summarized, which is a reference for designers.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM63

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