大型電力變壓器附加損耗與溫度場分析
[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)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM41
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