Box-in结构对特高压换流变压器散热性能影响的仿真分析  

Simulation Analysis of Box-in Structure Influence on Heat Dissipation Performance of UHV Converter Transformer

作　　者：刘丛 郝建[1] 李文平[2] 李志伟[2] 文豪 程林 LIU Cong;HAO Jian;LI Wenping;LI Zhiwei;WEN Hao;CHENG Lin(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Shapingba District,Chongqing 400044,China;Baoding Tianwei Baobian Electrical Co.,Ltd.,Baoding 071023,Hebei Province,China;NARI Group Corporation/State Grid Electric Power Research Institute,Nanjing 211112,Jiangsu Province,China;Wuhan NARI Co.,Ltd.,State Grid Electric Power Research Institute,Wuhan 430074,Hubei Province,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]保定天威保变电气股份有限公司,河北省保定市071023 [3]南瑞集团(国网电力科学研究院)有限公司,江苏省南京市211112 [4]国网电力科学研究院武汉南瑞有限责任公司,湖北省武汉市430074

出　　处：《电网技术》2022年第2期803-811,共9页Power System Technology

基　　金：国家重点研发计划项目(2017YFB0902704);国家电网有限公司科技项目(换流变局部放电缺陷发展机理研究及影响换流变温升特性关键因素研究)。

摘　　要：Box-in结构在减弱换流变压器噪声影响方面发挥了较好的作用,但其对换流变压器散热和温度分布的影响值得关注。采用有限元仿真方法对有无Box-in结构换流变压器周围的环境气流分布和变压器自身油流和温度分布进行数值模拟,分析了Box-in结构的存在对换流变压器温升的影响规律,研究了Box-in结构换流变压器的通风策略。结果表明:换流变压器箱壁温升随环境风速的增加而减小;Box-in结构的存在使换流变压器箱壁的对流换热能力大幅降低,导致含Box-in结构换流变压器的箱壁平均温度偏高3.5K,局部温度偏高7.7-17.55K;在强制通风的情况下,换流变压器箱壁温升会随风速的增加呈指数规律减小,综合考虑换流变压器所处的环境温度和气流情况,可适当选择自然通风、自然和强制通风并行、直接强制通风3种通风策略。Box-in structure plays an important role in reducing the noise effect of the converter transformer,but its influence on heat dissipation of the converter transformer deserves attention.In this paper,the finite element simulation method is used to study the air flow distribution around the converter transformer,the oil flow and the temperature distribution of the transformer itself with or without Box-in structure.The influence of the Box-in structure on the temperature rise of the converter transformer is analyzed,and the ventilation strategy is studied.The results show that the temperature rise of the tank walls of the converter transformer decreases with the increase of the ambient wind speed;that the convective heat transfer capacity of the tank walls of the converter transformer is greatly reduced due to the existence of the Box-in structure,which results in the average temperature of the tank walls of the transformer with Box-in structure being 3.5 K higher and the local temperature 7.7 K-17.55 K higher;and that in the case of forced ventilation,the temperature rise of the converter transformer tank walls will decrease exponentially with the increase of wind speed.Considering the ambient temperature and the air flow situation of the converter transformer,three ventilation strategies,namely direct natural ventilation,parallel natural and forced ventilation and direct forced ventilation,can be adopted.

关 键 词：特高压换流变压器 Box-in 温度特性 有限元法 通风策略 

分 类 号：TM721[电气工程—电力系统及自动化]