摘要
相变辅助散热是提升在运配电变压器过载能力的一种经济而高效的方法。针对这一新的变压器拓扑形式,提出一种场路结合的温度计算方法。首先,建立相变辅助散热配电变压器集总参数热路模型,探究辅助散热模块与波纹片接触热阻采用热路等效温度节点结合散热模块散热量实验的提取方法。在热路模型基础上,预测和评估各种复杂工况下变压器的过载运行性能,为变压器安全过载运行策略提供参考。在场分析法的三维流固耦合模型中采用波纹片表贴处设置等效对流传热系数的处理方法,由热路模型提供边界条件,采用有限体积法获得直观的温度场流场分布。通过样机实验对比发现,场路结合法热点温度和顶层油温的计算结果与实验结果的最大相对误差小于10%,说明该方法能满足工程计算要求。
Phase change auxiliary cooling is an economical and effective way to improve the overload capacity of a transformer.In view of this new transformer topology,a temperature calculation method was proposed by combining the field analysis and the thermal circuit model.Firstly,the lumped parameter thermal circuit model of the phase change auxiliary cooling distribution transformer was established,and the method of obtaining the contact thermal resistance between auxiliary cooling module and corrugated fin was studied by using thermal circuit equivalent temperature node combined with heat dissipation experiment of cooling module.Based on the thermal circuit model,the overload operation performance of transformer under various complex load conditions was predicted and evaluated,which can provide reference for the safe overload operation strategy of the transformer.In the three-dimensional fluid structure coupling model of the field analysis method,the equivalent convective heat transfer coefficient of the thermal circuit was set at the contact surface between corrugated fin and cooling module.The boundary conditions were provided by the thermal circuit model,and the temperature field and flow field distribution were obtained by using the finite volume method.Through the comparison of prototype experiments,it can be found that the maximum relative error between the calculated results and the experimental results of hot spot temperature and top oil temperature are less than 10%,indicating that this method can meet the requirements of engineering calculation.
作者
石华林
熊斌
冯韵
蔡木良
顾国彪
SHI Hualin;XIONG Bin;FENG Yun;CAI Muliang;GU Guobiao(Institute of Electrical Engineering Chinese Academy of Sciences,Haidian District,Beijing 100190,China;University of Chinese Academy of Sciences,Shijingshan District,Beijing 100049,China;Electric Power Research Institute of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330096,Jiangxi Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第14期5278-5288,共11页
Proceedings of the CSEE
关键词
配电变压器
温升计算
辅助散热
热路模型
distribution transformer
temperature rise calculation
auxiliary cooling
thermal circuit model
