摘要
取向硅钢片的磁致伸缩特性是引起变压器铁心振动的主要原因,同时叠片铁心拐角搭迭区域的电磁力也会影响铁心振动,另外,直流偏磁会加剧铁心的振动。本文考虑直流偏磁工作状态的影响,针对铁心搭迭区域的电磁振动进行了分析。以定制的方圈铁心为研究对象,建立了包含搭迭缝隙的三维仿真模型,通过仿真计算得到了直流偏磁条件下不同时刻的应力和位移分布,进而分析了直流偏磁条件下由磁致伸缩力和电磁力引起的铁心振动。最后对实验室中的方圈铁心展开了直流偏磁下的振动实验,实验结果证明了仿真结果的正确性。研究结果表明,在直流偏磁条件下,对搭迭区域进行振动分析需要建立包含搭迭缝隙的三维仿真模型,同时也应该考虑电磁力对铁心振动的影响,此外,直流偏磁会使励磁电流发生畸变,铁心磁场周期分布不对称,变压器铁心搭迭区域振动增强,振动的高次谐波和奇次谐波含量增加。
The magnetostrictive property of the silicon steel sheet is the main cause of transformer vibration.At the same time,the effect of electromagnetic force at the overlap area will also affect the core vibration.In addition,dc bias aggravates the vibration of the transformer core.The vibration in the core overlap area considering the influence of dc bias is studied in this paper.A three-dimensional simulation model of a custom-made square ring core containing gaps was firstly established.The stress and displacement distribution at different moments were obtained,and also the core vibration caused by magnetostrictive force and eletromagnetic force was analyzed.Finally,the vibration experimental under dc bias was carried out and the experimental results showed that the simulation results were correct.It is showed that a three-dimensional simulation model including the gap of the overlap area is necessary in order to analyze the vibration of the overlap area and the influence of electromagnetic force on the core vibration should also be considered.The study also shows that the excitation current is distorted and periodic distribution is asymmetric by dc bias,as a result of which the vibration of transformer core overlap area increases.
作者
李维铮
祝丽花
石永恒
王前超
LI Wei-zheng;ZHU Li-hua;SHI Yong-heng;WANG Qian-chao(Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《电工电能新技术》
CSCD
北大核心
2020年第7期9-15,共7页
Advanced Technology of Electrical Engineering and Energy
基金
天津市高等学校创新团队培养计划(TD13-5040)。
关键词
直流偏磁
铁心振动
磁致伸缩
电磁力
搭迭区域
dc bias
core vibration
magnetostriction
electromagnetic force
overlap area
