过流冲击下超导带材角度依赖性退化特性研究  

Research on degradation characteristics of superconducting tapes under overcurrent impact

作　　者：谭亚雄 徐霜[1] 郭珺灏 吴建发 罗书山 Tan Yaxiong;Xu Shuang;Guo Junhao;Wu Jianfa;Luo Shushan(State Key Laboratory of Power Transmission Equipment Technology,Chongqing University,Chongqing 400044,China;Economic and Technology Institute,State Grid Fujian Electric Power Co.Ltd.,Fuzhou 350013,China;Shibei Electric Power Supply Branch,State Grid Chongqing Power Co.Ltd.,Chongqing 4001120,China)

机构地区：[1]重庆大学输变电装备技术全国重点实验室,重庆400044 [2]国网福建省电力有限公司经济技术研究院,福州350013 [3]国网重庆市电力有限公司市北供电公司,重庆401120

出　　处：《低温与超导》2024年第7期7-13,46,共8页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51907012);重庆市研究生科研创新项目(CYS23059)资助。

摘　　要：本文研究了过电流冲击下高温超导带材临界电流的角度依赖性退化规律,并分析了超导层微观结构变化和角度依赖性退化的内在原因。结果表明,过电流冲击导致高温超导带材临界电流的角度依赖性减小,且临界电流在垂直场中的衰减速度较平行场更快。超导层结构损伤和晶粒取向的改变导致临界电流和角度依赖性减小。当过电流幅值从120 A增加到300 A时,角度依赖性评估指数(S^(2))从180降至120。同时,过电流冲击对CuO_(2)导电区较非超导层影响更显著,约瑟夫森的弱耦合导致临界电流在垂直场下的衰减更快。该研究成果可为超导输电装备的优化设计和安全运行提供理论依据和实践指导。This paper investigated the angle dependent degradation of critical current under overcurrent impacts,and analyzed the underlying reasons for the microstructure changes and angle dependent degradation of the superconducting layer.The results indicate that overcurrent impacts reduce the angle dependence of the critical current,and the decay rate of the critical current in the vertical field is faster than that in the parallel field.Structural damage to the superconducting layer and alterations in grain orientation result in a decrease in critical current and angle dependence.Specifically,when the overcurrent magnitude increases from 120 A to 300 A,the angle dependency evaluation index(S^(2))decreases from 180 to 120.Moreover,the effect of overcurrent impact on the conductive region of CuO_(2) is more pronounced than that on the non-superconducting layer,with the weak coupling of Josephson junctions leading to faster degradation of the critical current in perpendicular fields.This research can provide theoretical basis and practical guidance for the optimization design and safe operation of superconducting transmission equipment.

关 键 词：超导带材 过流冲击 角度依赖性 

分 类 号：TB661[一般工业技术—制冷工程]