基于流体-温度场耦合的油浸式变压器温升特性仿真分析  

Simulation Analysis of Temperature Rise Characteristics of Oil-immersed Transformer Based on Fluid-temperature Field Coupling

作　　者：朱险峰 刘子伟 李盛飞 ZHU Xianfeng;LIU Ziwei;LI Shengfei(State Grid Hubei Yichang Power Supply Company,Yichang 443000,China;College of Electrical Engineering&New Energy China Three Gorges University,Yichang 443002,China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line China Three Gorges University,Yichang 443002,China)

机构地区：[1]国网湖北省电力有限公司宜昌供电公司,湖北宜昌443000 [2]三峡大学电气与新能源学院,湖北宜昌443002 [3]三峡大学湖北省输电线路工程技术研究中心,湖北宜昌443002

出　　处：《电工技术》2022年第15期46-50,共5页Electric Engineering

摘　　要：针对变压器铁芯、绕组等因电磁损耗可能产生过高热量导致绝缘老化而影响使用寿命的问题,建立了基于流体-温度场耦合的油浸式变压器二维轴对称模型,对变压器油流速度及油流通道入口宽度对其温升特性的影响进行了仿真分析。结果表明,当油流速度从0.05 m/s增加到0.20 m/s时,铁芯最高温度降低11.62 K,高压绕组则降低9.26 K,低压绕组变化不明显;当入口宽度从30 mm增加到100 mm时,铁芯最高温度降低14.27 K,低压绕组和高压绕组则分别降低6.87 K和16.06 K。进一步分析后发现,增大入口宽度可加快变压器油在循环散热时流经其部件时的速度,从而提高散热效率。The transformer core and windings may generate excessive heat due to electromagnetic losses,which may cause insulation aging and affect their service life.Aiming at this problem,a two-dimensional axisymmetric model of oil-immersed transformer based on fluid-temperature field coupling is established,and the influence of the oil flow velocity and the inlet width of the oil flow channel on the temperature rise characteristics of the transformer is simulated and analyzed.The results show that when the oil flow speed increases from 0.05 m/s to 0.20 m/s,the maximum temperature of the iron core decreases by 11.62 K,the high-voltage winding decreases by 9.26 K,and the low-voltage winding does not change significantly.When the entrance width is increased from 30 mm to 100 mm,the maximum temperature of the iron core is reduced by 14.27 K,and the low-voltage winding and high-voltage winding are reduced by 6.87 K and 16.06 K respectively.After further analysis,it is found that increasing the width of the inlet can speed up the oil flow speed of the transformer oil when it passes through its components during circulating heat dissipation,thereby improving the heat dissipation efficiency.

关 键 词：油浸式变压器 流体 温度场 温升特性 

分 类 号：TM411[电气工程—电器]