基于多物理场仿真的低频变压器温度特性分析及导向结构优化

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国家科技期刊平台
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中文摘要：为了降低低频工况下油浸式电力变压器的热点温度与内部温升,基于电磁-热-流体场多物理场耦合对低频变压器绕组区域导向结构开展优化分析.通过对变压器电磁部分的有限元数值计算,确定低频变压器与同工况下的工频变压器在铁芯和绕组区域的磁密分布与损耗特性区别.然后在此基础上将铁芯和绕组的损耗作为热源代入流体场和温度场进行仿真分析,得到变压器整体和绕组区域局部的温度及油流分布.最后通过构建20 Hz低频变压器绕组区域的油流传热模型,结合有限元仿真研究导油挡板数量与分布对绕组区域油流量、平均温度和热点温度的影响,并获得导向结构的最佳分配方案.研究结果表明,20 Hz低频变压器绕组区域的热点温度较无挡油板的模型下降了14.44%,该结果可为低频变压器紧凑化设计提供优化方案.

外文标题：Temperature Characteristics Analysis and Guide Structure Optimization of Low-frequency Transformer Based on Multi-physics Field Simulation

外文摘要：In order to reduce the hot-spot temperature and internal temperature rise of oil-immersed power transformers under low-frequency operating conditions,an optimization analysis is carried out for the winding-area oriented structure of low-frequency transformers based on the multi-physical field coupling of electromagnetic-thermal-fluid fields.Through the finite element numerical analysis of the electromagnetic part of the transformer,the difference between the magnetic density distribution and loss characteristics of the low-frequency transformer and the power-frequency trans-former under the same working condition in the core and winding area is determined.And on this basis,the loss of the core and winding as a heat source is substituted into the fluid field and temperature field for simulation analysis to obtain the temperature and oil flow distribution of the transformer as a whole and the winding region locally.Finally,by con-structing the oil flow and heat transfer model in the winding region of 20 Hz low-frequency transformer and combining it with finite element simulation,the influences of the number and distribution of oil guiding baffles on the oil flow,average temperature and hot-spot temperature in the winding region are investigated,and the optimal distribution scheme of the guiding structure is obtained.The results show that the hot-spot temperature in the winding region of the 20 Hz low-frequency transformer decreases by 14.44%compared with the model without oil baffles,which provides an optimi-zation scheme for the compact design of the low-frequency transformer.

外文关键词：

low-frequency oil-immersed transformermulti-physical field simulationloss densitytemperature rise dis-tributionguide structurehot-spot temperature

作者：

王巧媛、贾少锋、梁得亮、赵义焜、毕建刚、杨智

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作者单位：

西安交通大学电工材料电气绝缘全国重点实验室,西安 710049

中国电力科学研究院有限公司,北京 100192

国网浙江省电力有限公司电力科学研究院,杭州 310000

关键词：

低频油浸式变压器多物理场仿真损耗密度温升分布导向结构热点温度

基金：

国家重点研发计划国家电网科技项目

项目编号：

2021YFB24011005211DS22002C

出版年：

2024

DOI：

10.13336/j.1003-6520.hve.20230880

高电压技术

中国电力科学研究院　中国电机工程学会

高电压技术

CSTPCD北大核心

影响因子：2.32

ISSN：1003-6520

年,卷(期)：2024.50(5)