摘要
铁心硅钢片磁致伸缩是变压器振动的主要原因,考虑磁致伸缩效应的变压器振动模拟一直是难点。针对某大型油浸式自耦变压器噪声超标问题,首先求解三维瞬态电磁场,再将磁致伸缩与热效应相比拟,建立铁心磁致伸缩等效模型,通过铁心节点磁通密度插值磁致伸缩特性曲线,应用于等效模型得到铁心磁致伸缩位移,实现磁固耦合计算。以铁心位移为激励计算器身振动,再考虑器身-变压器油-油箱的流固耦合,计算整机振动和辐射噪声,其结果与试验站测试吻合较好,验证了方法流程的有效性和正确性。利用所建立的计算流程,分析了油箱加筋与油箱壁厚度变化,以及油箱底部约束方式对振动噪声的影响。
Transformer vibration is mainly caused by magnetostriction of iron core silicon steel sheets. It is always difficult to simulate transformer vibration considering magnetostrictive effect. Here, in order to solve excess noise problem of a certain large oil-immersed auto-transformer, firstly 3-D transient electromagnetic field was solved. Then, the iron core magnetostriction equivalent model was established through comparing the magnetostrictive effect with the thermal one. By interpolating with magnetic flux density of iron core nodes, the magnetostrictive characteristic curve was obtained and applied in the proposed equivalent model to gain iron core magnetostrictive displacements, and realize the magneto-solid coupled calculation. Then, iron core displacements were taken as excitation to calculate vibration of the transformer body. Finally, considering fluid-solid coupling of transformer body-oil-tank, the whole device’s vibration and radiated noise were calculated. It was shown that the calculated results are in good agreement with the test ones to verify the correctness and effectiveness of the proposed method. Based on the established calculation flow path, effects of tank reinforcement, tank wall thickness and tank bottom constraint mode on vibration and noise of the transformer were analyzed.
作者
鲁文波
曲光磊
LU Wenbo;QU Guanglei(Shanghai Hikey-Sheenray Information Technology Co Ltd,Shanghai 200235,China;TBEA Shenyang Transformer Group Co Ltd,Shenyang 110025,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第15期273-280,共8页
Journal of Vibration and Shock
关键词
变压器
磁致伸缩
磁固耦合
流固耦合
振动噪声
transformer
magnetostriction
magneto-solid coupling
fluid-solid coupling
vibration and noise
