用有限元方法分析电力变压器绕组轴向稳定性  

Analysis of Axial Stability of Power Transformer Windings Using Finite Element

作　　者：郭健[1] 林鹤云[1] 徐子宏 金承祥 

机构地区：[1]东南大学电气工程学院,南京210096 [2]中电电气集团,扬中212211

出　　处：《高电压技术》2007年第11期209-212,共4页High Voltage Engineering

基　　金：2005年江苏省科技攻关项目(BE2005086)~~

摘　　要：针对电力变压器绕组轴向稳定性的计算方法中,"质量—弹簧—阻尼"集中参数法无法考虑绕组的弯曲变形和垫块的数量、宽度对轴向稳定性影响的问题,采用有限元的方法计算绕组各线饼短路情况下的电动力,以此作为绕组轴向振动的力载荷分析绕组的轴向稳定性,得出了绕组各线饼的位移分布,在绕组轴向振动分析中既考虑了垫块的材料属性,又兼顾了垫块沿周向分布的特点。结果表明,绕组在短路情况下既存在轴向平移,也存在弯曲变形,最大位移出现在绕组上下端部,通过增加绕组周围垫块的数量和宽度可以减小绕组的变形量。The finite element method was employed to calculate the axial short-circuit distributed force. The force is then used as a distributed load to obtain the winding displacement distribution in the analysis of axial stability of windings, in which the bearing material attribute and installation characteristic are considered. The research work of this paper indicates that the winding axial electromagnetic forces are symmetrically distributed during short-circuit, and the maximum force exists at the windings terminals so that the maximum winding deformation also occurs at the windings terminals. The windings have axial translation as well as bending deformation, and the maximum winding deformation position is in accordance with the location where transformer accident frequently occur. Using the winding maximum deformation as the key measurement index of axial stability, the winding deformation can be decreased by increasing the number and breadth of bearings, and thus the windings ability of axial resisting short-circuit can be effectively improved.

关 键 词：变压器 轴向稳定性 有限元 垫块 轴向平移 弯曲变形 

分 类 号：TM41[电气工程—电器]