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题名	高温超导带材及线圈的交流损耗; 高温超导带材及线圈的交流损耗
作者	1张国民,电工研究所
学位类别	博士
答辩日期	2003
授予单位	中国科学院电工研究所
导师	1林良真,电工研究所
关键词	交流损耗 临界电流 各向异性 应力-应变 Bi系带材 AC losses Critical current Anisotropy Stress-strain Bi2223/Ag tape
其他题名	高温超导带材及线圈的交流损耗
学位专业	电工理论与新技术
中文摘要	由于高温超导带材及线圈的交流损耗直接关系到高温超导装置的运行成本及稳定性，所以，对高温超导带材及线圈交流损耗的研究，一直高温超导电力应用研究的最重要内容之一。本文在系统介绍高温超导体的交流损耗及其研究现状与存在问题的基础上，从理论和实验两方面，研究了Bi系高温超导单根带材、多根超导并联组合带材、及超导线圈的临界电流与交流损耗的特性：重点研究了交流损耗与临界电流的电磁特性、机械特性、各向异性特性、及带间绝缘层与传输电流频率对交流损耗的影响等。主要包括：在实验方面，探讨了交流背景磁场下高温超导带材的交流传输损耗的测量问题，通过对交流损耗测量的理论分析，提出了采用双“扩字形电势引线测量交流背景磁场下高温超导带材交流传输损耗的方法；建立了超导带材短样及线圈交流损耗的电测量系统；从而为交流损耗的研究提供实验数据与理论检验标准。基于临界态模型与高温超导体的有效质量理论，建立了高温超导带材及并联堆叠带材的交流损耗与临界电流的各向异性理论模型：给出了高温超导带材的交流损耗及临界电流随（交、直流）背景磁场与超导带面夹角变化规律的理论公式；依据所建立的高混超导短样带材的各向异性理论公式，给出了高温超导线圈交流损耗的数值计算模型；并利用该模型，计算了高温超导双饼线圈的交流损耗；并一与实验测量结果进行了比较分析。实验测量了高温超导带材在不同弯曲半径及不同拉伸应力一F的临界电流与交流损耗；建立了高温超导带材的交流损耗和临界电流随弯曲与拉伸应力一应变变化的理论模型；利用该理论公式计算的结果与测量结果符合得相当好。研究了高温超导带材及并联堆叠带材的交流损耗随传输电流频率的变化情况；及多根并联组合超导带间绝缘对交流损耗的影响情况：实验研究了并联堆叠带材的各向异性特性；给出了有限根超导带并联时，磁滞损耗的理论计算公式。另外，对高温超导带材在交流背景磁场下的直流临界电流特性，及超导体传输交流时的流一压曲线特性进行了实验研究，并对高温超导带材的交流最大载流能力的测量判据问题进行了探讨，给出最大交流载流电流测量判据的建议。 Because AC losses of high temperature superconducting (HTS) tapes and coils have direct affects on the stability of HTS apparatus, the investigation of AC losses of HTS tapes and coils has always been one of the most important research branches of HTS application. In this paper, the research progress of AC losses of high temperature superconductors and the existing problems on AC losses investigation are introduced; The characteristics of the critical current and AC losses of HTS tapes, stacked tapes and HTS coil, such as electro-magnetic characteristics ^ the anisotropy> the mechanics characteristics and the effects of insular layer between stacked tapes and the influence of frequency of AC transport current etc, are investigated. The main research aspects are as follows: The method of AC transport losses measurement in AC applied magnetic field was investigated. Upon the analysis of AC loss measurement, a method to measure AC transport losses in AC applied field was proposed by use of double '8' shape coils. A programme controlled system was set up to measure AC losses of HTS tapes and coils, which can ensure the experiment data needed by theoretical analysis and verification. Based on the effective mass theory and critical state model, an anisotropic theory of critical current and AC losses for single HTS tape and tape stacks were established. Analytical formulae were presented to calculate critical currents and AC losses with an arbitrary angle between the wide side of HTS tape and the direction of AC or DC applied fields. From the anisotropic theory of AC losses of HTS sample, a numerical model to calculate AC losses of HTS coil was developed. To verify this model, AC transport losses of a double winded pancake HTS coil were calculated and compared with the measured results. The critical current and AC losses in HTS tapes were measured under different winding radii and pulling stress. A theoretical model was proposed to describe the relationship of critical currents and AC losses with the winding or pulling stress-strain. It is shown that the calculated values were in agreement with the measured results quite well. To study the of effect of insulator layer among tapes in a stack and the influence of frequency of AC transport currents on AC losses, AC losses of a single tape and stacks were measured for AC transport current with different frequencies in two cases: with and without insulator among the tapes in a stack. Theoretical formulae to calculate hysteresis losses in stacked tapes were also presented. In addition, the characteristics of critical current of HTS tapes in AC applied field and that of voltage-current curve when transport AC currents were studied. The problem on the criterion of AC current carrying capacity of HTS tape was discussed, and some suggestion on the criterion of AC current carrying capacity were proposed.
语种	中文
公开日期	2010-10-18
页码	131
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/6850]
专题	电工研究所_其他部门_其他部门_博士学位论文
推荐引用方式 GB/T 7714	1张国民,电工研究所. 高温超导带材及线圈的交流损耗, 高温超导带材及线圈的交流损耗[D]. 中国科学院电工研究所. 2003.

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