田凤奇,杜振斌,王建民,石建
TIAN Fengqi,DU Zhenbin,WANG Jianmin,SHI Jian

• 1:省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学)
• 2:河北省电磁场与电器可靠性重点实验室(河北工业大学)
• 3:河北省输变电装备电磁与结构性能重点实验室

摘要(Abstract)：

大容量MFT（中频变压器）具有体积小、重量轻和功率密度大等优点，但磁热问题较为突出。为保证此类变压器运行的可靠性，以一台百兆瓦级400 Hz的MFT为研究对象，对其进行了磁热性能仿真分析。首先对绕组电导率进行修正，并利用有限元软件对中频变压器的磁场分布、损耗密度及温度场进行计算与分析，根据磁热分布结果，发现结构件受绕组端部漏磁的影响，杂散损耗过大，容易引发局部过热。然后，为了降低结构件损耗并防止局部过热，对器身端部的肢板式磁屏蔽结构进行改进，并分析了屏蔽结构尺寸对结构件磁热性能的影响。最后，对比分析改进前后的仿真结果发现，改进后的结构件的损耗密度和温升都得到了明显改善，其磁热性能满足产品设计要求。
Large-capacity medium-frequency transformers(MFTs) offer advantages such as compact size, light weight, and high power density, but they also face significant challenges related to magnetic and thermal performance. To ensure the reliability of these transformers, a 100 MW level, 400 Hz MFT is selected for a simulation analysis of its magnetic and thermal performance. The electrical conductivity of the windings is first adjusted, and finite element software is then used to calculate and analyze the magnetic field distribution, loss density, and temperature field. The results reveal that leakage flux at the ends of the windings significantly impacts the structural components, leading to excessive stray losses and localized overheating. To address this, the limb-type magnetic shielding structure at the ends of transformer body is improved, with an analysis of how the dimensions of the shielding structure affect the magnetic and thermal performance of the components. A comparative analysis of the simulation results before and after these improvements shows a significant reduction in loss density and temperature rise in the structural components, ultimately ensuring that the magnetic and thermal performance meets design requirements.

关键词(KeyWords)： 中频变压器;漏磁场;高频损耗;局部过热;结构改进
MFT;leakage magnetic field;high-frequency loss;localized overheating;structural improvement

Abstract:

Keywords:

基金项目(Foundation): 河北省科技重大专项项目（22282102z）

作者(Author): 田凤奇,杜振斌,王建民,石建
TIAN Fengqi,DU Zhenbin,WANG Jianmin,SHI Jian

DOI: 10.19585/j.zjdl.202501011

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