直流偏磁时变压器铁芯的力学特性分析  

Analysis of mechanical characteristics of transformer iron core with DC bias

作　　者：李长云[1] 刘亚魁 

机构地区：[1]齐鲁工业大学电气工程与自动化学院,山东济南250353

出　　处：《电力自动化设备》2015年第12期122-125,共4页Electric Power Automation Equipment

基　　金：山东省自然科学基金资助项目(ZR2012EEM002)~~

摘　　要：直流偏磁导致变压器局部过热,振动和噪声加剧,严重时可能损坏变压器。结合能量守恒原理,推导得到铁芯磁致伸缩与直流偏磁电流间的关系模型。基于所建立的数学模型,分析了直流偏磁引发的硅钢片的形变。以单相三柱变压器旁柱上最外层的硅钢片为对象进行了仿真研究,仿真结果证实了所推导模型的正确性,且表明磁致伸缩引发的铁芯形变是变压器振动加剧的关键因素。DC bias may cause the partial overheat of transformer,exacerbate its vibration and noise and even damage it. According to the energy conservation law,a model of relationship between magnetostriction and DC- bias current is deduced,based on which,the deformation of silicon steel sheet caused by DC bias is analyzed. Simulative study is carried out for the outmost silicon steel of a single- phase three- column transformer and the simulative results prove the correctness of the deduced model and show the iron- core deformation caused by magnetostriction is the key factor exacerbating the transformation vibration.

关 键 词：变压器 变压器铁芯 直流偏磁 力学特性 磁致伸缩 模型 仿真 

分 类 号：TM14[电气工程—电工理论与新技术]