短路电动力作用下变压器低压绕组变形研究  

Research on deformation of transformer low-voltage winding under short-circuit electromagnetic force

作　　者：林野 兰生[1] 许明龙 陈杰[1] 朱志豪 LIN Ye;LAN Sheng;XU Minglong;CHEN Jie;ZHU Zhihao(School of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108)

机构地区：[1]福州大学电气与自动化学院,福州350108

出　　处：《电气技术》2022年第1期8-14,共7页Electrical Engineering

摘　　要：电力变压器短路时会产生巨大的短路电动力,当短路电动力过大时会导致变压器绕组变形。为研究三相三绕组变压器短路时的电动力分布和绕组变形情况,本文以一台50MV·A/110kV的三相三绕组变压器为例,计算变压器发生短路时的短路电流,将该短路电流作为激励,通过有限元软件计算绕组的短路电动力,采用磁-结构耦合的方式计算在最大短路电动力作用下的绕组变形和应力分布。结果表明,短路时低压绕组受到向内压缩的辐向电动力和向中间压缩的轴向电动力,绕组中间部分受到的短路电动力大于两端,导致绕组中部的变形程度大于两端。研究结果对研究变压器绕组变形具有一定实际意义。There is a huge short-circuit electromagnetic force in short-circuited condition for power transformer.When short-circuit electromagnetic force is too large,it will cause the transformer winding deformation.In this paper,a 50MV·A three-phase three-winding transformer is taken as an example.The short circuit current in three-phase symmetrical short-circuited condition for transformer is calculated and took as an excitation in finite element analysis.Then the short-circuit electromotive force of winding is calculated by finite element software.The magnetic-structure coupling method is used to calculate the winding deformation and stress distribution under the maximum short-circuit electromagnetic force.The results show that the low-voltage winding is subjected to the radial electromagnetic force compressed inward and the axial electromagnetic force compressed toward the middle during short-circuit.The short-circuit electromagnetic force that acts on the middle part of the winding is greater than the two ends,which causes the deformation of the middle part of the winding to be greater than the two ends.The research results have certain practical significance for related researches such as transformer winding deformation.

关 键 词：三绕组变压器 磁-结构耦合 短路电动力 绕组变形 

分 类 号：TM41[电气工程—电器]