高温超导带材的焊接与局部差异对失超传播特性影响研究

发布时间：2018-01-05 08:08

本文关键词：高温超导带材的焊接与局部差异对失超传播特性影响研究　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：为了满足超导磁体的稳定运行和失超保护的要求,本文进行了高温超导带材失超传播特性的实验研究。目标是针对超导磁体中各种工作情况得到高温超导带材的最小失超能和失超传播速度,有助于超导磁体的失超保护设计。本文在给出课题的研究背景和意义的基础上,首先介绍了高温超导带材失超传播特性测试系统,包括两个部分,第一部分为临界电流测试系统,其作用是测量待测带材的临界电流,确定失超传播实验的传输电流。第二部分为失超传播特性测试系统,其作用是测量高温超导带材的最小失超能和失超传播速度。通过实验研究了高温超导带材的失超传播特性,分别利用电压和温度判据来表征带材的失超传播速度,比较分析了 YBCO带材和Bi2223带材的最小失超能和失超传播速度的差异,为实验室超导磁体绕组的材料选择提供参考。然后对超导磁体工作时可能存在的三种情况分别对YBCO带材和Bi2223带材进行了失超传播特性实验研究。这三种情况分别为带材本身的内部缺陷,局部磁场差异以及焊接接头的存在。首先在高温超导带材内部不可避免的存在内部缺陷,本文实验研究了弯曲恢复后对高温超导带材临界电流的影响,确定满足实验条件的弯曲应变。通过弯曲应变对高温超导带材引入内部缺陷,实验研究并分析了内部缺陷对两种带材失超传播特性的影响,掌握了失超传播特性的变化规律。然后通过ANSYS仿真分析了高温超导磁体的磁场分布,发现磁体内部的磁场存在分布不均匀的现象。实验研究并分析了局部磁场差异对两种带材失超传播特性的影响,得到了失超传播特性与磁场之间的关系。最后由于带材长度限制,因此绕制磁体时会存在焊接接头,于是实验研究了高温超导带材焊接接头处临界电流变化,测试不同长度焊接接头对高温超导带材失超传播特性的影响,并对测试结果进行了比较分析。实验测得的数据为实验室后续超导磁体的失超保护提供数据支持。
[Abstract]:In order to meet the stable operation of the superconducting magnet and quench protection requirements, this paper studied the propagation characteristics of ultra high temperature superconducting tapes. The target is lost for all kinds of work in superconducting magnet has the minimum loss of HTS tapes and super quench propagation velocity, quench protection design helps superconducting magnet based. The research background and significance, firstly introduces the high temperature superconducting tape quench propagation characteristics testing system, including two parts, the first part is the critical current test system, its function is to measure the critical current with material, determine the current transmission loss super transmission experiments. The second part is the quench propagation characteristic test system, its function is to measure the minimum loss of super high temperature superconducting tapes and quench propagation velocity. Through experimental study the quench propagation properties of HTS tapes were used The voltage and temperature criterion to characterize the strip quench propagation velocity, a comparative analysis of the YBCO strip and Bi2223 strip the minimum loss of super and quench propagation velocity difference, and provide reference for selection of laboratory superconducting magnet winding material. Then the three situation may exist when the superconducting magnet of YBCO strip and Bi2223 strip. The Study on quench propagation experiments. The three cases were internal defects of the strip itself, and the existence of differences in the local magnetic field of welded joints. First, in the presence of the internal defects of HTS tapes inside the inevitable, effect on the critical current of HTS tapes was studied to determine the bending recovery after the bending strain meet the experimental conditions introduce the internal defects of HTS tapes by bending strain, experimental study and analysis of the internal defects of two strip quench propagation properties The influence of the variation of Super Master loss propagation. Then ANSYS simulation analysis of the magnetic field distribution of high temperature superconducting magnet, the magnet that the internal magnetic field distribution is uneven. The experimental research and analysis of the difference of two kinds of local magnetic strip quench propagation characteristics of the loss of the relationship between super. The propagation characteristics and magnetic field. Finally, due to the strip length limit, so it has the magnet winding welding joint, so the study of high temperature superconducting tapes change critical current joint welding test, welding joint of different length effect on transmission characteristics of ultra high temperature superconducting tapes, and the test results were compared and analyzed. The experiment measured the data provide data support for the follow-up of the superconducting magnet quench protection laboratory lost.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM26

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