非晶合金干式变压器电磁与热特性研究

发布时间：2018-08-14 10:06

【摘要】：非晶合金干式变压器属新型节能变压器。由于节能的需要以及非晶材料自身价格的降低，此类变压器在市场所占比重越来越大。变压器如何降低损耗，降低温升是电力系统内一直需要解决的问题。普通硅钢做铁心损耗较大，非晶材料作为铁心很好的弥补了这个问题。由于非晶合金干式变压器结构不同，需要准确计算出变压器的损耗分布以及变压器的温升，是保证变压器安全、高效和稳定运行的关键。本文结合国内外对干式变压器电磁与温升计算研究的现状，根据变压器基本原理，通过有限元软件分析了非晶干式变压器的漏磁分布、计算铁心损耗，最后总结出多层箔式绕组的损耗分布情况，并对箔式绕组与漏磁通之间的关系也了做进一步的研究。在温度场、流体场计算方面，首先，介绍传热学、流体力学理论与仿真方法，用此方法分别计算630kVA/10kV普通干式变压器和100kVA/400V非晶干式变压器的温度场和流体场。搭建实验平台，测量短路情况下树脂外表面温度，使用短路情况下电流实测值计算损耗作为热源计算变压器温度场与流体场，将仿真结果与实验结果进行了对比，，温度值相对误差在±10%之内；其次，应用上述方法计算了630kVA/10kV非晶干式变压器各部件的温度场分布以及流体场分布，并将温度场仿真结果与实际平均温度进行了对比来验证计算方法的准确性，总结了误差产生的原因。在此基础上建立二维变压器模型，对绕组处温升进行细致分析；最后，分析在不同分接以及不同负载系数情况下变压器温度场与流体场变化。在此基础上通过改变绝缘挡板位置分析其对温升与气体流速的影响，并给出了结论，对变压器的结构优化有一定的指导意义。
[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 卤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.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM412

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