考虑负载变化的植物绝缘油变压器温升特性研究  

Study on Temperature-rise Characteristic of Vegetable Oil Insulated Transformer Considering Load Variation

作　　者：江翼[1] 程林[1] 陈清淼 杨牧 钱航 张娣[2] 李妮 杨涛 JIANG Yi;CHENG Lin;CHEN Qingmiao;YANG Mu;QIAN Hang;ZHANG Di;LI Ni;YANG Tao(Wuhan NARI Limited Company of State Grid Electric Power Research Institute,Wuhan.430074,China;Wuhan University,Wuhan 430072,China;China Electric Power Research Institute(Wuhan),Wuhan 430074,China;State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China)

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [2]武汉大学,武汉430072 [3]中国电力科学研究院武汉分院,武汉430074 [4]国网河南省电力公司电力科学研究院,郑州450052

出　　处：《高压电器》2018年第6期132-137,共6页High Voltage Apparatus

基　　金：国家电网公司科技项目(WNZ151-0007)~~

摘　　要：为研究植物绝缘油变压器在实际运行中的温升特性,应用热工学和流体力学原理分析了变压器内部传导热及散热机制,建立了变压器的二维简化模型。采用有限元法求解该模型在考虑负载变化下的温度场,得到了植物绝缘油变压器在稳定负载时的温度场分布,与矿物绝缘油变压器进行了对比,发现:当负载系数K<1.5时,矿物绝缘油变压器的温升特性优于植物绝缘油,而当负载系数K≥1.5时,植物绝缘油变压器的温升特性优于矿物绝缘油变压器;同时,基于给定的动态负载曲线计算了植物绝缘油变压器的温度场分布,同样与矿物绝缘油变压器进行了对比。结果表明,当负载较低时,植物绝缘油变压器的温升特性比矿物绝缘油变压器差,而当负载较高时,植物绝缘油变压器的温升特性优于矿物绝缘油变压器。To understand the temperature-rise characteristic of vegetable oil insulated transformer in practical operation,the heat conduction and heat dissipation mechanisms of the transformer are analyzed by finite element method based on thermodynamics and fluid mechanics. A two-dimensional simplified model of the transformer is established. The finite element method is used to solve the temperature field of the model under load change,and the temperature field distribution of the vegetable oil insulated transformer under stable load is obtained. It is found that, compared with the mineral oil insulated transformer, the vegetable oil insulated transformer achieves better temperature-rise characteristic when the load factor K is not less than 1.5,but it has worsete mperature-rise characteristic when K is less than 1.5. Moreover, the temperature field distribution of the vegetable oil insulated transformer is calculated based on the given dynamic load curve,and the result shows that the temperature-rise characteristic of the vegetable oil insulated transformer is better than that of the mineral oil insulated transformer under higher load,while under lower load,the result is opposite.

关 键 词：植物绝缘油变压器 温度场 动态负载 热点温度 有限元法 

分 类 号：TM41[电气工程—电器]