引用本文: | 李长云,刘亚魁.直流偏磁时变压器铁芯的力学特性分析[J].电力自动化设备,2015,35(12): |
| LI Changyun,LIU Yakui.Analysis of mechanical characteristics of transformer iron core with DC bias[J].Electric Power Automation Equipment,2015,35(12): |
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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。 |
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 |
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基金项目:山东省自然科学基金资助项目(ZR2012EEM002) |
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Analysis of mechanical characteristics of transformer iron core with DC bias |
LI Changyun, LIU Yakui
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School of Electrical Engineering and Automation,Qilu University of Technology,Ji’nan 250353,China
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Abstract: |
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. |
Key words: electric transformers transformer iron core DC bias mechanical characteristics magnetostriction models computer simulation |