万安级YBCO电流引线高温超导段设计及实验研究

发布时间：2017-12-27 21:04

本文关键词：万安级YBCO电流引线高温超导段设计及实验研究　出处：《中国科学技术大学》2017年硕士论文　论文类型：学位论文

【摘要】：低温超导电物理实验装置基本都需要电流引线跨越室温和磁体运行温度两个温区向超导磁体提供千安甚至万安级的电流。Bi系带材带间电阻低,高温超导段结构简单,是目前万安级二元电流引线的主要选择,但随银金价格不断上涨其价格也愈来愈昂贵。相比而言,Y系带材热导率小、受磁场影响较小,近年来成为高温超导应用的热门,由于Y系带材多采用镍基合金基带,带间电阻高,在二元电流引线领域多应用于百到千安级,很少有应用于万安级先例。本文将设计制作运用YBCO带材的万安级电流引线高温超导段,为YBCO带材能大规模应用万安级二元电流引线的可行性进行技术预研和实验验证。本文基于Bi系二元电流引线研发基础,采用数值仿真分析与试验验证相结合的方法,优化设计低接头电阻的易于加工的万安级YBCO电流引线高温超导段组件结构;基于ANSYS Workbench15.0对YBCO高温超导段进行电磁学和热力学计算分析,最小化低温侧漏热并验证安全性;研究合适的加工与锡焊工艺,制作10kA YBCO带材高温超导段组件。通过10kA YBCO内外层和整体高温超导段组件液氮浸泡下的Ic和接头电阻测试,检验制作10kA YBCO带材高温超导段组件的焊接工艺。搭建10kA电流引线低温性能测试平台,进行YBCO高温超导段的载流能力、接头电阻、LOFA和不烧毁时间测试,验证前期结构设计的合理性。
[Abstract]:The cryogenic superconducting physics experiment device basically requires current leads to cross the room, and the magnet operates at two temperature zones to provide 1000 + or even Wan level current to the superconducting magnet. Bi lacing material has low interband resistance and high temperature superconducting segment structure. It is the main choice of Wan Wan level two element current lead, but with the rising price of silver and gold, its price is more and more expensive. In contrast, Y strip, small thermal conductivity, influenced by the magnetic field is small, in recent years become a hot high temperature superconducting applications, due to the Y system using nickel base alloy strip with high resistance between baseband, two yuan in the current lead field applied to 100 Ka class, rarely used in Wanan precedent level. This paper will design and produce a Wan Wan current lead high temperature superconducting section using YBCO strip, and make a technical pre research and experimental validation for the feasibility of large-scale YBCO Wan band two element current leads. In this paper, Bi two yuan on the basis of current lead development, by means of numerical simulation analysis and experimental validation of the combination optimization, easy processing of YBCO high temperature superconducting current leads the component structure design of low joint resistance; ANSYS Workbench15.0 of electromagnetism and thermodynamics of YBCO high temperature superconducting section calculation based on the analysis of the low temperature side heat leakage and minimization verify the safety; Study on processing and proper soldering process, making 10kA YBCO tape high temperature superconducting component. The welding process of 10kA YBCO strip high temperature superconducting module is tested through testing the Ic and joint resistance of 10kA YBCO inner and outer high temperature superconducting components and liquid nitrogen immersion. A low temperature performance test platform for 10kA current leads is built, and the current carrying capacity, joint resistance, LOFA and no burn time of YBCO high temperature superconducting section are tested.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM26

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