非晶合金干式變壓器電磁與熱特性研究
發(fā)布時間：2018-08-14 10:06
【摘要】：非晶合金干式變壓器屬新型節(jié)能變壓器。由于節(jié)能的需要以及非晶材料自身價格的降低，此類變壓器在市場所占比重越來越大。變壓器如何降低損耗，降低溫升是電力系統(tǒng)內(nèi)一直需要解決的問題。普通硅鋼做鐵心損耗較大，非晶材料作為鐵心很好的彌補了這個問題。由于非晶合金干式變壓器結(jié)構(gòu)不同，需要準確計算出變壓器的損耗分布以及變壓器的溫升，是保證變壓器安全、高效和穩(wěn)定運行的關(guān)鍵。 本文結(jié)合國內(nèi)外對干式變壓器電磁與溫升計算研究的現(xiàn)狀，根據(jù)變壓器基本原理，通過有限元軟件分析了非晶干式變壓器的漏磁分布、計算鐵心損耗，最后總結(jié)出多層箔式繞組的損耗分布情況，并對箔式繞組與漏磁通之間的關(guān)系也了做進一步的研究。 在溫度場、流體場計算方面，首先，介紹傳熱學(xué)、流體力學(xué)理論與仿真方法，用此方法分別計算630kVA/10kV普通干式變壓器和100kVA/400V非晶干式變壓器的溫度場和流體場。搭建實驗平臺，測量短路情況下樹脂外表面溫度，使用短路情況下電流實測值計算損耗作為熱源計算變壓器溫度場與流體場，將仿真結(jié)果與實驗結(jié)果進行了對比，，溫度值相對誤差在±10%之內(nèi)；其次，應(yīng)用上述方法計算了630kVA/10kV非晶干式變壓器各部件的溫度場分布以及流體場分布，并將溫度場仿真結(jié)果與實際平均溫度進行了對比來驗證計算方法的準確性，總結(jié)了誤差產(chǎn)生的原因。在此基礎(chǔ)上建立二維變壓器模型，對繞組處溫升進行細致分析；最后，分析在不同分接以及不同負載系數(shù)情況下變壓器溫度場與流體場變化。在此基礎(chǔ)上通過改變絕緣擋板位置分析其對溫升與氣體流速的影響，并給出了結(jié)論，對變壓器的結(jié)構(gòu)優(yōu)化有一定的指導(dǎo)意義。
[Abstract]:Amorphous alloy dry type transformer belongs to new energy saving transformer. Due to the need of energy saving and the reduction of the price of amorphous materials, such transformers account for more and more in the market. How to reduce the loss and reduce the temperature rise of transformers is a problem that needs to be solved all the time in power system. Common silicon steel core loss is large, amorphous material as core to make up for this problem. Due to the different structure of amorphous alloy dry type transformer, it is necessary to calculate the loss distribution of transformer and the temperature rise of transformer accurately, which is the key to ensure the safe, efficient and stable operation of transformer. According to the basic principle of transformer, the magnetic flux leakage distribution of amorphous dry type transformer is analyzed by finite element software, and the core loss is calculated according to the present situation of electromagnetic and temperature rise calculation of dry transformer at home and abroad. Finally, the loss distribution of multilayer foil winding is summarized, and the relationship between foil winding and flux leakage is further studied. In the aspect of temperature field and fluid field calculation, firstly, heat transfer theory, fluid mechanics theory and simulation method are introduced. The temperature field and fluid field of 630kVA/10kV ordinary dry transformer and 100kVA/400V amorphous dry transformer are calculated by this method. The experiment platform was set up to measure the outer surface temperature of resin under short circuit, and the temperature field and fluid field of transformer were calculated by using the measured value of current under short circuit as heat source. The simulation results were compared with the experimental results. The relative error of temperature value is within 鹵10%. Secondly, the temperature field distribution and fluid field distribution of each component of 630kVA/10kV amorphous dry transformer are calculated by using the above method. The simulation results of the temperature field are compared with the actual average temperature to verify the accuracy of the calculation method, and the causes of the error are summarized. On this basis, a two-dimensional transformer model is established to analyze the temperature rise at the winding in detail. Finally, the variation of temperature field and fluid field of the transformer under different splicing and load coefficients are analyzed. On this basis, the influence of insulation baffle on temperature rise and gas velocity is analyzed by changing the position of insulation baffle, and the conclusion is given, which is of certain guiding significance to the optimization of transformer structure.
【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】：2015
【分類號】：TM412
本文編號：2182518
[Abstract]:Amorphous alloy dry type transformer belongs to new energy saving transformer. Due to the need of energy saving and the reduction of the price of amorphous materials, such transformers account for more and more in the market. How to reduce the loss and reduce the temperature rise of transformers is a problem that needs to be solved all the time in power system. Common silicon steel core loss is large, amorphous material as core to make up for this problem. Due to the different structure of amorphous alloy dry type transformer, it is necessary to calculate the loss distribution of transformer and the temperature rise of transformer accurately, which is the key to ensure the safe, efficient and stable operation of transformer. According to the basic principle of transformer, the magnetic flux leakage distribution of amorphous dry type transformer is analyzed by finite element software, and the core loss is calculated according to the present situation of electromagnetic and temperature rise calculation of dry transformer at home and abroad. Finally, the loss distribution of multilayer foil winding is summarized, and the relationship between foil winding and flux leakage is further studied. In the aspect of temperature field and fluid field calculation, firstly, heat transfer theory, fluid mechanics theory and simulation method are introduced. The temperature field and fluid field of 630kVA/10kV ordinary dry transformer and 100kVA/400V amorphous dry transformer are calculated by this method. The experiment platform was set up to measure the outer surface temperature of resin under short circuit, and the temperature field and fluid field of transformer were calculated by using the measured value of current under short circuit as heat source. The simulation results were compared with the experimental results. The relative error of temperature value is within 鹵10%. Secondly, the temperature field distribution and fluid field distribution of each component of 630kVA/10kV amorphous dry transformer are calculated by using the above method. The simulation results of the temperature field are compared with the actual average temperature to verify the accuracy of the calculation method, and the causes of the error are summarized. On this basis, a two-dimensional transformer model is established to analyze the temperature rise at the winding in detail. Finally, the variation of temperature field and fluid field of the transformer under different splicing and load coefficients are analyzed. On this basis, the influence of insulation baffle on temperature rise and gas velocity is analyzed by changing the position of insulation baffle, and the conclusion is given, which is of certain guiding significance to the optimization of transformer structure.
【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】：2015
【分類號】：TM412
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本文編號：2182518
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