直流背场下YBCO涂层导体交流临界电流依频变化（英文）  

FREQUENCY DEPENDENCE OF AC CRITICAL CURRENT OF YBCO COATED CONDUCTORS UNDER DC MAGNETIC FIELD

作　　者：赵伟杰[1,2,3] 王银顺[1,2,3] 代常会[1,2,3] 夏立萌[1,2,3] 孙迪[1,2,3] 戴婧姝[1,2,3] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]新能源电力系统国家重点实验室,北京102206 [3]高电压技术与电磁兼容北京市重点实验室,北京102206

出　　处：《低温物理学报》2014年第2期97-103,共7页Low Temperature Physical Letters

基　　金：Project supported by National Natural Science Foundation of China(Grant No.51077051)~~

摘　　要：基于对不同条件下YBCO涂层导体交流临界电流的测量结果,本文研究了YBCO涂层导体的交流临界电流、频率与外加磁场幅值和角度之间的关系,提出了一个相应的经验公式.利用该公式可计算在任意频率、任意外加直流背场下YBCO涂层导体的交流临界电流,计算结果和实验结果相一致.另外,对于YBCO涂层导体交流临界电流依频变化提出了一种可能的机理,频率的增高使得磁通穿透区域变窄,因而需要更大的电流来实现样品的完全穿透,这就使得交流临界电流随着频率增高而增大.Based on the experimental results of the YBCO coated conductor （YBCO CC）, this paper presents the relation among the AC critical current, frequency and magnetic field. In addition, an empirical formula is obtained by which the results were calculated and agreement with the experimental results well. Especially, a possible mecha- nism is suggested to explain the dependence of the AC critical current of YBCO CC on frequency. The increasing of frequency at given current narrows down the area of flux penetration, therefore more current is needed to fully pene- trate the sample. Consequently, the AC critical current increases with the frequency increasing.

关 键 词：交流临界电流 依频变化 直流背场 YBCO涂层导体 

分 类 号：TM26[一般工业技术—材料科学与工程]