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闭式重力热管与换流变阀侧套管一体化技术

Integrated Technology of Gravity Heat Pipe and Valve Side Bushing of Converter Transformer
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摘要 为解决大负荷条件下换流变阀侧套管内部发热严重、局部过热的问题,从理论和实验两方面研究了闭式重力热管与换流变阀侧套管一体化技术的传热能力、工质种类、充液率及倾斜角度等关键问题。理论分析表明:一体化技术的传热能力可完全满足套管的实际工作需求,套管内部所需传递热量小于传热极限值的7%。加热带模拟导管发热实验研究表明:载流导管内部填充的工质会强化其自身的热传递过程,当工质的工作温度与套管工作温度相匹配时,载流导管稳态温度分布均匀性最为优异;工质种类不同对应的最佳充液率存在较大区别,但都与无工质时载流导管的最高温度区所在位置直接相关;倾斜角度对导管温度分布均匀性有一定程度的不良影响,但基本满足套管的安装角度需求。导管载流发热实验研究表明:一体化技术显著提升了载流导管温度分布的均匀程度,峰值温度由108.1℃降低到84.6℃,最大温差由47℃降低到3.2℃。论文研究成果可指导超/特高压级换流变阀侧套管与闭式重力热管一体化结构设计,同时也为解决断路器等电力设备的局部过热问题提供了一种全新的技术手段。 In order to solve the problem of local overheating in the valve side bushing of converter transformer under the condition of heavy load, we theoretically and experimentally studied the key topics in the integrated technology of closed gravity heat pipe and converter valve side bushing, such as heat transfer capacity, type of working fluid, filling rate and inclination angle, etc. Firstly, the theoretical analysis shows that the heat transfer capacity of the integrated technology can meet the actual working needs of the bushing, and the heat transfer inside the bushing is less than 7% of the heat transfer limit value. Secondly, the results of heating belt simulated conductor heating show that the medium inside the current-carrying conductor strengthens its own heat transfer process. When the working temperature of the working fluid matches the working temperature of the valve side bushing of converter transformer, the uniformity of the steady-state temperature distribution of the current-carrying conductor is the best. There are great differences in the optimum liquid filling capacity corresponding to different working fluid types, but it is directly related to the location of the highest temperature zone of the current-carrying duct without working fluids. The inclination angle has some adverse effects on the steady-state temperature distribution of conductor, but it can meet the requirements of different installation angles of the converter valve side bushing basically. Finally, the results of conductor current-carrying heating experiments show that the uniformity of temperature distribution in current-carrying conductor is significantly improved by the integrated technology, in which the peak temperature decreases from 108.1 ℃ to 84.6 ℃, and the maximum temperature difference decreases from 47 ℃ to 3.2 ℃. The research results in this paper can guide the design of integrated structure of valve side bushing of EHV/UHV converter and closed gravity heat pipe. At the same time, the conclusion also provides a
作者 胡伟 许佐明 尹朋博 谢梁 徐涛 罗晓庆 HU Wei;XU Zuoming;YIN Pengbo;XIE Liang;XU Tao;LUO Xiaoqing(State Key Laboratory of Electrical Insulation for Electric Equipment,Xi'an Jiaotong University,Xi'an 710049,China;State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan 430074,China)
出处 《高电压技术》 EI CAS CSCD 北大核心 2019年第7期2314-2321,共8页 High Voltage Engineering
基金 国家电网有限公司科技项目(GY71-17-027) 中国电力科学研究院有限公司创新基金(GY83-19-007)。
关键词 换流变压器 套管 热管 一体化 散热 冷却工质 converter transformer bushing heat pipe integration heat dissipation working fluid
作者简介 胡伟,1979—,男,博士生,高工,主要从事特高压工程外绝缘技术、高压套管研制及运维关键技术。E-mail:huwei3@epri.sgcc.com.cn;通信作者:许佐明,1982—,男,高工,主要从事输变电设备外绝缘技术、高压套管在线监测及绝缘诊断技术研究工作。E-mail:xuzuoming@epri.sgcc.com.cn.
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