摘要
全环氧固封高频变压器采用环氧树脂固体绝缘材料实现设备整体绝缘,可大幅降低设备体积。考虑到环氧树脂导热性能较差,高频变压器内部热量难以散出,提出在高频变压器铁芯与低压绕组之间加散热水管的散热方法,有效降低其运行温度。以10kV全环氧固封高频变压器为研究对象,分析计算了铁芯损耗和绕组损耗,搭建了损耗试验平台,将计算结果与试验结果进行对比,验证了损耗计算的准确性。以高频变压器损耗作为热源,建立了温度场仿真模型,分析了水流量、水管材质和环氧树脂导热系数等因素对水冷散热效果的影响规律,指导高频变压器的散热设计。10kHz/200kVA样机温升试验结果与仿真结果误差为2.7%,验证了仿真模型的准确性和散热方式的有效性,支撑了全环氧固封高频变压器的工程化应用。
Epoxy resin sealing high frequency transformer(ERS-HFT)uses epoxy resin as the insulation material,greatly reducing the volumes of the equipment.As it is difficult to dissipate the internal heat in the ERS-HFT due to the poor thermal conductivity of the epoxy resin,a heat dissipation method is proposed by adding a heat dissipation water pipe between the high-frequency transformer core and the low-voltage winding in this paper in order to effectively reduce the operating temperature of the ERS-HFT.Based on the 10kV ERS-HFT,both the core loss and the winding loss are calculated,and the loss test platform is built.The comparison between the calculation results and the test results proves the accuracy of the loss calculation method.With the loss of ERS-HFT as a heat source,the finite element simulation model of temperature field is established.The influence laws of various factors on water cooling and heat dissipation effects are analyzed,including water flow rates,water pipe materials,thermal conductivity of epoxy resin,etc.The temperature rise test of the 10kHz/200kVA ERS-HFT is carried out with the error of only 2.7%between the test results and that of the finite element model,which verifies the accuracy of the finite element model and the effectiveness of the heat dissipation method.
作者
靳艳娇
乔光尧
邓占锋
李芳义
李卫国
赵国亮
刘海军
JIN Yanjiao;QIAO Guangyao;DENG Zhanfeng;LI Fangyi;LI Weiguo;ZHAO Guoliang;LIU Haijun(State Key Laboratory of Advanced Power Transmission Technology(State Grid Smart Grid Research Institute Co.,Ltd(Global Energy Interconnection Research Institute)),Changping District,Beijing 102209,China)
出处
《电网技术》
EI
CSCD
北大核心
2022年第7期2531-2537,共7页
Power System Technology
基金
国家重点研发计划项目(2020YFB1506800)。
关键词
高频变压器
温度场
散热
high frequency transformer
temperature field
heat dissipation
