35kv变压器匝间短路故障分析.docVIP

变压器短路冲击累积效应评估技术 王楠1，王伟1，张鑫1，藏春艳2，魏菊芳1 （1.国网天津市电力公司电力科学研究院 天津市 西青区 300384valuation Technology of The Cumulative Effects of Short Circuit in Transformer WANG Nan1, WANG Wei1, ZHANG Xin1, ZHANG Chuyan2, WEI Jufang1 (1.Electric Power Research Institute of Tianjin Electric Power Corporation, Xiqing District, Tianjin 300384, China; 2.School of Electrical and Electronics Engineering, Huazhong University of Science and Technology, Wuhan 430074, China) Abstract: anti-short circuit capability can be effectively analyzed and prediction of winding deformation diagnosis is improved ,by Correctly evaluating the effect of the cumulative effect of the previous short circuit in transformer. Based on the basic principle of the ANSYS magnetic-structural coupled field，this paper builds a independent model of the magnetic field -structure field of the cumulative effects of short circuit in transformer. For a transformer with a capacity of 12000MVA, the model of electromagnetic field calculation and the model of structure field are established by the reasonable simplification, a simulation analysis is carried out for the single impact of the transformer windings, and the leakage magnetic field and the distribution of the transformer are obtained. On this basis, through the boundary conditions, the simulation analysis is carried out to analyze the impact of multiple shocks, and the relationship between the number of short circuit and winding deformation is presented. Key words: power transformer; short circuit impact; cumulative effect; Simulation 摘要：正确评价变压器历次短路冲击后累积效应的影响，能够有效辅助变压器抗短路能力分析，提高绕组变形诊断的预见性。本文基于ANSYS磁-结构耦合场分析的基本原理，搭建了一种变压器短路冲击累积效应的电磁场-结构场独立模型，针对一台12000MVA容量的变压器，通过合理地简化，分别搭建了电磁场计算模型和结构场计算模型，开展了变压器绕组单次冲击仿真分析，得到了变压器的漏磁场和受力分布，在此基础上，通过边界条件设定，进行了多次冲击累积效应仿真分析，提出了不同短路电流下，变压器短路冲击次数和绕组变形的关系。 关键词：变压器；； 引言变压器绕组单次冲击 2 ANSYS耦合场简介随着计算机软硬件技术的迅速发展，大型通用商业ANSYS在多个领域计算中应用，该软件不仅可进行静力、动力、流体、温度、结构优化等有限元计算，还可对不同的物理场进行耦合分析。耦合场分析是指考虑了两个或多个工程物理场之间相互作用分析。耦合场分析依赖于所耦合的物理场，具体有两大类，即顺序耦合和直接耦合。顺序耦合包括两个或多个按一