發(fā)布時間：2018-02-06 07:32

  本文關鍵詞： 箱式變電站 通風散熱 CFD數(shù)值模擬 優(yōu)化設計　出處：《沈陽工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著我國經(jīng)濟的不斷發(fā)展,輸電電網(wǎng)不斷擴大,城網(wǎng)變電所迅速覆蓋市區(qū)。城網(wǎng)變電所位于市中心,承擔重要的供電任務,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構特點,其極易出現(xiàn)因溫升過高而導致的設備安全問題,在夏季溫度較高時更加危險。因此需要合理的通風散熱方案,以保證主變壓器的安全運行。本文以某箱式變電站為研究對象,采用試驗、理論分析和數(shù)值仿真相結合的方法,基于CFD數(shù)值模擬技術,通過磁-流-熱耦合分析計算,對箱式變電站整體的通風換熱效果進行了仿真分析,本文主要針對下面幾個問題進行分析:(1)分析箱式變電站內部損耗組成;通過有限元分析軟件對7600kVA干式變壓器進行電磁計算,分析其主磁通及短路阻抗、漏磁場分布,并與試驗值進行對比;分析其鐵心損耗分布、負載損耗及附加損耗分布;(2)基于傳熱學與流體動力學理論,對變壓器內部、高低壓控制柜內部生熱、散熱過程進行理論分析。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行數(shù)值仿真,并將仿真值與試驗值進行對比,對計算方法的有效性進行驗證;(3)以某箱式變電站為設計基礎,建立合理的數(shù)學模型和物理模型,通過對其速度場和溫度場進行數(shù)值模擬,分析不同出風口速度對于變壓器溫升以及整體通風散熱效果的影響。在原模型基礎上,分別在箱變變壓器室底部、箱變棚頂增加通風孔,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散熱及空氣流動提供理論基礎;固定出風口位置,分別改變進風口位置以及進風口高度,研究箱變內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散熱的影響。總結出合理的節(jié)能設計方案,為設計人員提出參照。
[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.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM63

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本文編號：1493924