超高压双器身结构的变压器设计与电磁分析  

Structure Design and Electromagnetic Analysis of EHV Double-body Power Transformer

作　　者：李洪奎[1] 井永腾[2] 李岩[2] 李龙女[2] 韩芳旭[2] 

机构地区：[1]沈阳理工大学自动化与电气工程学院,沈阳110159 [2]沈阳工业大学电气工程学院,沈阳110870

出　　处：《高电压技术》2016年第7期2322-2328,共7页High Voltage Engineering

基　　金：国家自然科学基金(51177103);辽宁省高校创新团队支持计划(LT2011002)~~

摘　　要：由于超高压变压器采用独立调压结构(分为主体变压器和调压变压器),此结构变压器占地面积大,安装、调试和维修工作复杂。因此,提出一种新型器身结构,为双器身共箱式结构,即主体变压器和调压变压器设计在同一油箱内,可使占地面积大大减小,并降低了安装、调试和维修工作的难度。首先利用三维有限元分析方法,结合超高压双器身变压器的磁路特点,建立"磁场-电路"耦合数学模型,计算分析该产品漏磁场,并对金属结构件磁密、损耗进行计算和分析。同时,采用能量法对产品短路阻抗进行求解,最后通过实验值定量地分析此结构对短路阻抗的影响。结果表明:采用调压变压器新结构后,油箱磁密幅值降低了0.01 T;夹件磁密幅值降低了4.16%;夹件损耗降低了8.1%,短路阻抗略有增加,增加的最大幅值为2.56%,并通过与实验数据的对比得到计算误差<2%,验证了计算的有效性。通过计算与分析表明,新结构与原结构的产品特性变化不大,新结构符合生产技术要求。The independent regulation structure （main transformer and adjustable transformer） is generally adopted in extra high voltage （EHV）, thus, there are several disadvantages, e.g., covers large area, installation, debugging and main tenance complex, for the mentioned transformer. Therefore, we put forward a novel body structure which has double body with one tank, namely, the main transformer and the regulating transformer are designed in the same tank.The struc ture has advantages which greatly reduce the cover area, and reduce the difficulty of installation, debugging, and maintenance. The 3D finite element analysis （FEA） combined with the magnetic circuit characteristics of EHV double body transformer is used to compute the leakage magnetic field for the mentioned transformer, and the ＇magnetic fieldcircuit＇ coupled mathematical model is established to compute and analyze the magnetic flux density and loss in structure parts. At the same time, we investigate the shortcircuit impedance of the transformer by the energy method, and finally analyze the shortcircuit impedance affected by the new structure through experimental quantitative analysis. The results show that the magnetic density amplitude of oil tank reduces by 0.01 T, the magnetic density amplitude of clamp reduces by 4.16%, the losses of clamp reduces by 8.1%, and the shortcircuit impedance increases slightly and the maxi mum amplitude is 2.56% after adding voltage variation transformer. The calculation error is less than 2%, which is verified by the comparison with experimental data. The computation and analysis show that the characteristics between the novel structure and the original one hardly change, and the novel structure conforms to the requirements of the pro duction technology.

关 键 词：超高压变压器 双器身 漏磁场 短路阻抗 电磁分析 

分 类 号：TM402[电气工程—电器]