摘要
采用试验与仿真相结合的方法,对干式变压器在自然冷却条件下的温度场特性展开了系统的研究。首先,采用高低压绕组同时施加额定直流电流的试验方法,排除了涡流效应对高低压绕组损耗结果的影响,准确地获得了绕组损耗与温升的对应关系。同时,利用STAR-CCM+软件,分析了达到热平衡后,变压器内部温度场和流场的分布情况以及不同的湍流模型选取和绕组等效建模方法对温升模拟结果的影响规律。研究结果表明,由于空气自然对流的影响,高低压绕组的温度场分布规律基本相同,即:底端温度最低且温度随绕组高度的增加逐渐升高。此外,采用k-ε低雷诺湍流模型和柱坐标等效建模法所得到的变压器自冷温升的仿真结果与试验结果的误差最小,且具有最快的收敛速度。所提出的仿真方法能够准确、快速地对自冷条件下干式变压器的温度场特性进行分析,可为变压器的设计与优化提供一定的指导与参考。
The temperature field characteristics of dry-type transformer under natural cooling are systematically studied by combining test and simulation.Firstly,the test method of applying rated DC current to both high and low voltage windings is used to eliminate the influence of eddy current effect on the loss results,and obtain the corresponding relationship between winding loss and temperature rise.Meanwhile,the STAR-CCM+is used to analyze the distribution of temperature and flow fields of the transformer after reaching thermal equilibrium,as well as the influence of different turbulence model selection and winding equivalent modeling methods on the temperature rise simulation results.The results indicate that due to the influence of natural convection,the temperature distribution of high and low voltage windings is basically the same,that is,the bottom temperature is the lowest and the temperature gradually increases with the increase of winding height.In addition,the simulation results of temperature rise under natural cooling obtained using the k-εLow-Re model and cylindrical coordinate equivalent modeling method have the smallest error compared to the experimental results,and have the fastest convergence speed.The current simulation method can accurately and quickly analyze the temperature field characteristics of dry-type transformers under natural cooling,and can provide guidance for the design and optimization of transformers.
作者
李霞
苏步云
陈文锋
易吉良
姚小虎
Li Xia;Su Buyun;Chen Wenfeng;Yi Jiliang;Yao Xiaohu(Sunten Electrical Equipment Co.,Ltd.,Foshan,Guangdong 528300,China;Department of Engineering Mechanics,South China University of Technology,Guangzhou 510641,China)
出处
《机电工程技术》
2024年第2期253-256,282,共5页
Mechanical & Electrical Engineering Technology
关键词
干式变压器
自然冷却
温度场仿真
数值模拟
dry-type transformer
natural cooling
temperature field simulation
numerical simulation
