考虑气道局部努塞尔数的干式变压器热网络模型  

Thermal Network Model of Dry-type Transformer Considering Local Nusselt Number of Air Duct

作　　者：林碧仁 邓红雷[1] 郭德明 唐文虎[1,2] 刘刚 LIN Biren;DENG Honglei;GUO Deming;TANG Wenhu;LIU Gang(School of Electric Power,South China University of Technology,Guangzhou,Guangdong 510641,China;Guangdong Artificial Intelligence and Digital Economy Laboratory(Guangzhou),Guangzhou,Guangdong 510335,China)

机构地区：[1]华南理工大学电力学院,广东广州510641 [2]人工智能与数字经济广东省实验室(广州),广东广州510335

出　　处：《广东电力》2023年第4期11-20,共10页Guangdong Electric Power

基　　金：国家高技术研究发展计划(863计划)项目(2015AA050201);数字孪生电网智慧运行平台关键技术研究项目(PZL2022KF0009)。

摘　　要：为了准确分析干式变压器的热特性,提出一种考虑气道局部努塞尔数(Nu)的热网络模型。建立干式变压器的磁-热-流耦合有限元仿真模型,通过温升实验验证仿真模型的准确性;基于仿真数据获取局部努塞尔数关联式,用于修正热网络模型中的对流热阻,并对比分析修正前后热网络模型的准确性。以高压绕组温度的计算结果为例,未修正模型计算结果与仿真模型计算结果的平均绝对误差和平均相对误差分别为7.7℃和11.7%,修正模型计算结果与仿真模型计算结果的平均绝对误差和平均相对误差分别为5.5℃和8.4%,修正模型计算的轴向温度分布与仿真结果吻合度较高。仿真结果表明,修正后的热网络模型能够更准确地计算干式变压器绕组的温度分布。To accurately analyze the thermal characteristics of dry-type transformers,a thermal network model considering the local Nusselt number of the air duct is proposed.The finite element simulation model of magnetic thermal fluid coupling for the dry-type transformer is established,and the accuracy of the simulation model is verified through temperature rise experiment.Based on the simulation data,the local Nusselt number correlations are obtained to correct the convective thermal resistances of the thermal network model,and the accuracy of the thermal network model before and after the correction is compared and analyzed.Taking the calculation result of high-voltage winding temperature as an example,the average absolute error between the calculation result of the unmodified model and the simulation model is 7.7℃,and the average relative error is 11.7%.The average absolute error between the modified model calculation results and the simulation model calculation results is 5.5℃,and the average relative error is 8.4%.The axial temperature distribution calculated the modified model is in good agreement with the simulation results.The simulation results show that the modified thermal network model can more accurately calculate the temperature distribution of dry-type transformer winding.

关 键 词：干式变压器 热网络模型 局部努塞尔数 磁-热-流耦合 温升实验 

分 类 号：TM412[电气工程—电器]