带辅助散热设备的油浸自冷式变压器热路模型研究  

Study on Thermal Circuit Model of ONAN Transformer with Auxiliary Heat Dissipation Equipment

作　　者：章浩[1,2] 陈旭灿 李钊涛 李欣 林碧仁 霍伟锋 刘刚 ZHANG Hao;CHEN Xucan;LI Zhaotao;LI Xin;LIN Biren;HUO Weifeng;LIU Gang(School of Electric Power,South China University of Technology,Guangzhou,Guangdong 510641,China;Guangdong Key Laboratory of Clean Energy Technology,Guangzhou,Guangdong 510641,China;Dongguan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Dongguan,Guangdong 523000,China)

机构地区：[1]华南理工大学电力学院,广东广州510641 [2]广东省绿色能源技术重点实验室,广东广州510641 [3]广东电网有限责任公司东莞供电局,广东东莞523000

出　　处：《广东电力》2022年第8期95-103,共9页Guangdong Electric Power

基　　金：广东电网有限责任公司科技项目(031900KK52180153);国家自然科学基金面上项目(51977083)。

摘　　要：散热器的散热方式是变压器热特性的重要影响因素。在传统Swift模型基础上,增加平均壁温、散热器空气侧热阻等参数,建立变压器改进热路模型。随后给出改进模型中关键参数的计算方法,即2种散热方式(自然对流与加装风扇的辅助散热方式)下散热器空气侧的对流换热系数。最后利用改进模型计算油浸自冷式(oil natural air natural,ONAN)变压器在2种散热方式下的顶层油温,并与现场实测值进行对比。结果表明改进模型在自然对流方式下顶层油温的最大计算误差不超过2.63℃,在辅助散热方式下的最大误差不超过2.16℃,验证了改进模型的准确性。The heat dissipation mode of radiator is an important factor affecting the thermal characteristics of transformer.Therefore,on the basis of the traditional Swift model,the parameters such as average wall temperature and thermal resistance on the air side of radiator are added,and an improved thermal circuit model of transformer is proposed in this paper.Afterwards,the calculation method for the key parameters of the improved model is conducted,that is the convective heat transfer coefficient on the air side of radiator under two heat dissipation modes(natural convection and auxiliary heat dissipation mode with fan).Finally,the top oil temperatures of ONAN transformer under two heat dissipation modes are calculated by the improved model,and compared with the measured values.The results show that the maximum calculation error of the top oil temperature of the improved model in natural convection mode is less than 2.63℃,and the maximum error in auxiliary heat dissipation mode is less than 2.16℃,which verifies the accuracy of the improved model.The improved model proposed in this paper can provide reference for fan selection.

关 键 词：油浸自冷式变压器 热路模型 辅助散热 顶层油温 对流换热系数 

分 类 号：TM411[电气工程—电器]