一种高效的电力变压器绕组轴向固有振动频率计算模型  

Efficient model to calculate axial natural vibration frequency of power transformer winding

作　　者：李凯琪 郭健[1] 刘军 张安红 俞少佳 

机构地区：[1]南京航空航天大学,江苏南京211106 [2]钱江电气集团股份有限公司,浙江杭州311243

出　　处：《电工电能新技术》2016年第2期48-53,共6页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金资助项目(51307082)

摘　　要：在电力变压器设计过程中,绕组的固有振动频率是一个非常重要的性能参数。本文基于弹性动力学理论,根据绕组周向垫块弹性支撑等效原则,提出了一种高效的计算电力变压器绕组轴向固有振动频率的二维有限元模型,其固有振动频率的计算具有与三维模型一致的结果,但其计算效率得到大大的提高。同时研究表明,增加垫块的宽度和数量,以及增大预紧力都可以提高绕组轴向的固有振动频率,是避免绕组共振的一种有效应对方法。最后通过对固有振动频率计算的实例校核,验证了本文所提二维模型方法的有效性。In the design of transformer winding,natural vibration frequency is an important parameter. Based on the elastic dynamics theory,and according to the elastic support equivalent principle of radial pressboards,a 2D model to calculate axial vibration natural frequency of power transformer winding is presented. The 3D model to calculate natural vibration frequency can be simplified as a 2D one as the support of pressboard on the winding is same. It is tested that results of the 2D model are consistent with those of 3D model,but the former can achieve much higher calculation efficiency. It shows that increasing the width and number of pressboard can improve axial natural frequency through formula analysis and simulation,and also the relations between the changes of axial precompression and axial natural vibration frequencies on the windings are investigated. So these factors should be taken into consideration in the design of transformer winding,which can be an effective way to avoid the resonance of winding. Finally,the proposed 2D model＇s effectiveness is proved when compared with tested ones.

关 键 词：电力变压器 绕组 高效有限元模型 轴向固有振动频率 

分 类 号：TM401.1[电气工程—电器]