不同纳米晶铁芯结构下高频变压器空载铁耗特性  

No-load Core Loss Characteristics of High-frequency Transformers with Different Nanocrystalline Core Structures

作　　者：邓思影 程诗豪 陈鹏飞 董帮少[2] 赵海森 DENG Siying;CHENG Shihao;CHEN Pengfei;DONG Bangshao;ZHAO Haisen(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power Univer-sity,Beijing 102206,China;Advanced Technology&Materials Co.,Ltd.,Beijing 100081,China)

机构地区：[1]新能源电力系统全国重点实验室(华北电力大学),北京102206 [2]安泰科技股份有限公司,北京100081

出　　处：《高电压技术》2024年第9期3988-3997,共10页High Voltage Engineering

基　　金：国家重点研发计划(2022YFB2404103)。

摘　　要：为了研究高频变压器采用不同纳米晶铁芯结构时的铁芯损耗分布特性,以工作频率为10kHz,容量为20 kVA的U型、三角型和O型结构纳米晶铁芯为研究对象,对比了3种铁芯空载运行时铁芯不同位置磁密和铁耗分布情况,进一步研究了拐角内径对铁芯局部损耗特性的影响。结果表明:O型铁芯损耗密度分布较均匀,U型和三角型铁芯的损耗密度在磁路直线区域分布均匀;在拐角区域径向方向上,损耗密度减小速度先快后缓,切向方向上损耗密度先增大后减小;U型和三角型铁芯拐角处损耗密度最大值显著大于直线区域,适当增大拐角内径,能够显著降低铁芯的最大损耗密度;实验测得U型、三角型和O型铁芯空载损耗分别为37.3 W、50.5 W和20.5 W,局部热点温度最高分别为46.5℃、55.2℃和35.0℃,明显高于铁芯最高平均温度。To study the core loss distribution characteristics of high-frequency transformers with different nanocrystalline core structures,three types of nanocrystalline cores such as U-shaped,triangular and O-shaped with working frequency of 10 kHz and rated capacity 20 kVA are selected,and the flux density and iron loss distribution at different positions of the core under no-load condition are compared.Furthermore,the influence of the corner radius on the local core loss charac-teristics is also investigated.The results show that the loss density distribution of the O-shaped core is relatively uniform.For U-shaped and triangular cores,the loss density is evenly distributed in the straight region of the magnetic circuit.In the radial direction of the corner region,the rate of decrease in loss density is initially high and then slows down,while in the tangential direction,the loss density increases initially and then decreases.The maximum loss density at the corner of the U-shaped and triangular cores is significantly higher than that in the straight region.By appropriately increasing the inner radius of the corner,the maximum loss density of the core can be significantly reduced.Experimental results show that the no-load losses of the U-shaped,triangular,and O-shaped cores are 37.3 W,50.5 W,and 20.5 W,respectively.Ad-ditionally,the highest local hotspot temperatures recorded are 46.5℃,55.2℃and 35.0℃,respectively,which are significantly higher than the average temperature of the core.

关 键 词：高频变压器 铁芯结构 空载铁耗 损耗密度 损耗分布 

分 类 号：TM433[电气工程—电器]