基于有限元的电力变压器绕组弹塑性变形分析  

Analysis on Elastic and Plastic Deformations of Power Transformer Winding Based on Finite Element Method

作　　者：张海军 张华 马强[1] 刘彦琴 王曙鸿[3] ZHANG Haijun;ZHANG Hua;MA Qiang;LIU Yanqin;WANG Shuhong(Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle,Hubei University of Arts and Science,Hubei Xiangyang 441053,China;State Grid Sichuan Chengdu Electric Power Company,Chengdu 610023,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]湖北文理学院纯电动汽车动力系统设计与测试湖北省重点实验室,湖北襄阳441053 [2]国网四川省成都电力公司,成都610023 [3]西安交通大学电气学院,西安710049

出　　处：《高压电器》2019年第6期170-176,共7页High Voltage Apparatus

基　　金：国家自然科学基金资助项目(51577140);“机电汽车”湖北省优势特色学科群开放基金资助~~

摘　　要：电力变压器绕组受短路电磁力作用后,可能出现可恢复的弹性变形或不可恢复的塑性变形。文中通过电磁-结构耦合有限元分析,对短路电流冲击作用下的变压器绕组弹、塑性变形特性进行理论分析和三维数值模拟,以揭示绕组弹性和塑性变形机理。首先通过有限元电磁计算分析了绕组内部短路电磁力分布,其中绕组线饼的周向电磁力分布不均是导致绕组变形的重要原因。在弹性变形计算的基础上,依据材料学的弹塑性变形分析理论,构建了绕组累积变形的量化分析模型,能够反映多次短路电磁力作用后绕组变形的累积效应。最后,以一台110 kV/25 000 kVA、双绕组电力变压器模型为例,进行绕组弹、塑性变形计算。结果可以为变压器绕组动稳定性能和绕组塑性变形预测研究提供理论参考。Subjected to short-circuit electromagnetic force,the recoverable elastic deformation or irreparable plastic deformation in power transformer windings may be produced.In this paper,in order to reveal the elastic and plastic deformation mechanism of the winding,the elastic and plastic deformation characteristics of transformer windings under the impact of short-circuit current are analyzed theoretically and numerically by electromagnetic-structural coupling finite element analysis.Firstly,the distribution of the short circuit electromagnetic force in the winding is analyzed by the finite element electromagnetic calculation,in which the uneven distribution of the circumferential electromagnetic force of the winding disc is the important cause of the winding deformation.On the basis of elastic deformation calculation and elastic-plastic deformation analysis theory of materials,a quantitative analysis model of winding cumulative deformation is constructed,which can reflect the cumulative effect of winding deformation after multiple short-circuit electromagnetic forces.Finally,taking an 110 kV/25000 kVA double winding power transformer model as an example,the elastic and plastic deformation of the winding is calculated.The results can provide a theoretical reference for the dynamic stability of transformer windings and the prediction of winding plastic deformation.

关 键 词：电力变压器绕组 短路电磁力 弹性变形 塑性变形 累积效应 有限元 

分 类 号：TM41[电气工程—电器]