基于去离子水冷却±800 kV换流变压器阀侧套管的冷却效果和参数的影响  

Cooling Effect and Effect of Parameters of the Deionized Water Cooling Based ERIP Type Bushing of±800 kV Converter Transformer

作　　者：刘杉 高冲 侯俊义 周建辉 卢斌先[3] Liu Shan;Gao Chong;Hou Junyi;Zhou Jianhui;Lu Binxian(State Key Laboratory of Advance Power Transmission Technology,Global Energy Interconnection Research In-stitute Co.Ltd,Beijing,102211,China;Beijing DC T&D Engineering Technology Research Center,China-EPRI Electric Power Engineering Co.Ltd,Beijing,102200,China;School of Electrical and Electronic Engineering,North China Electric Power University,Beijing,102206,China)

机构地区：[1]先进输电国家重点实验室(全球能源互联网研究院有限公司),北京102211 [2]北京市直流输配电工程技术研究中心(中电普瑞电力工程有限公司),北京102200 [3]华北电力大学电气与电子工程学院,北京102206

出　　处：《电工技术学报》2024年第12期3884-3894,共11页Transactions of China Electrotechnical Society

基　　金：国家电网公司总部科技资助项目(5500-201958518A-0-0-00)。

摘　　要：随着我国±800 kV大容量特高压直流输电的快速发展,环氧树脂套管的过热问题备受关注。基于去离子水冷却,该文将环氧树脂套管的水道结构由多管道式改进为一体化结构。采用三维电-热-流场耦合分析方法,考虑热传导和热对流的影响,模拟了换流变压器阀侧套管的温度场分布。通过与温升实验数据对比,仿真结果与实验结果的误差在3.99%以内,验证了该套管模型设计的合理性。与去离子水冷却的多管道式套管相比,改进后的±800 kV去离子水冷却一体化套管的载流导体外表面的最高温度更低且环氧树脂内表面的温差更小,结果表明该套管的去离子水冷却效果极强。研究了水道尺寸、流量和入口水温对去离子水冷却一体化套管温度分布的影响,结果表明该套管的温度分布主要由入口水温和流量控制,将去离子水的流量设置为10 L/min时几乎可以带走套管产生的全部热量,且入口水温越低冷却效果越好。分析结果可用于去离子水冷却±800 kV环氧树脂套管的结构优化与设计。With the gradual increase of power grid transmission capacity,the overheating problem of large-capacity bushing in operation has become more and more serious.This paper proposes an integrated waterway cooling structure based on the method of deionized water cooling.Compared with the±400 kV deionized water-cooling multi-pipe bushing,the±800 kV integrated waterway cooling structure has a better cooling effect.The effects of waterway size,flow flux,and inlet water temperature on the temperature of integrated bushing based on deionized water cooling are analyzed using the simulation model.The results show that the temperature distribution of the bushing is mainly controlled by the inlet water temperature and flow flux.Suppose the flow flux of deionized water is 10 L/min,almost all the heat generated by the bushing can be taken away.The lower the inlet water temperature,the better the cooling effect.Firstly,based on the study of±400 kV deionized water-cooling multi-pipe bushing,the±800 kV integrated waterway cooling bushing is designed and fabricated.A three-dimensional electric-thermal-fluid field coupling model of the±800 kV integrated waterway cooling bushing is established,and its accuracy is verified compared with the experimental temperature.The experimental and simulation results show that the±800 kV integrated waterway cooling bushing has a simple cooling structure and strong cooling effect.Secondly,the temperature distribution of the±800 kV integrated waterway cooling bushing is analyzed.Under the working condition of flow flux of 21 L/min,inlet water temperature of 50℃,and current of 6736 A,the maximum temperature of the bushing is 90℃,well below the glass transition temperature of epoxy resin-impregnated paper.Therefore,the±800 kV integrated waterway cooling bushing solves the overheating problem in operation.Finally,the effects of waterway size,flow flux,and inlet water temperature on the bushing temperature distribution are analyzed.Within the variable range of waterway size,the larger the wid

关 键 词：去离子水 电-热-流场耦合模型 冷却效果 参数扫描 高压套管 

分 类 号：TM216[一般工业技术—材料科学与工程]