准绝热环境下Bi-2223/Ag带材在工频过电流冲击下的失超及恢复特性实验研究  

THE EXPERIMENT AND STUDY ABOUT QUENCHING AND RECOVERING CHARACTERISTICS OF Bi2223/Ag TAPES WITH OVER-CURRENTS AT POWER FREQUENCY IN QUASI-ADIABATIC STATE

作　　者：卜红纺[1] 惠东[1] 王银顺[1] 贾跃华[1] 周微微[1] 许熙[1] 李会东[1] 鲍庆[1] 

机构地区：[1]中国科学院电工研究所

出　　处：《低温物理学报》2007年第4期296-300,共5页Low Temperature Physical Letters

基　　金：国家863高技术基金(项目编号:2006AA03Z210)资助的课题~~

摘　　要：本文对工频过电流冲击下准绝热环境中的Bi-2223/Ag不锈钢加强多芯带的失超及恢复特性进行了实验研究.通过实验测量了在液氮温度(77K)、自场下Bi-2223/Ag超导带在幅值为100A至1015A,时间为300ms的工频电流冲击下,超导带材两端的电压,电流及带材表面温度的变化,得到冲击期间各参量的变化规律.另外,还比较了冲击电流相同、正常载流不同时,带材的温升及失超恢复时间,结果表明正常载流大时,则带材温升较高,失超恢复时间长.正常载流为60A<0.5Ic时,带材失超恢复时间为冲击时间的21倍.In this paper, the quenching and recovering Characteristics of stainless-steel reinforced muhifilamentary Bi2223/Ag tapes in quasi-adiabatic state with over-currents at power frequency were experimentally and theoretically studied. The voltage, current, temperature and recovering of the HTS tapes were measured and analyzed under nitrogen temperature of 77K and self-field with duration of 300ms and current amplitude in range of 100 A to 1005 A. In addition, the temperature and recovering characteristics of Bi2223/Ag tapes were investigated with the same over-current and different normal currents. The results showed the recovering time was longer when the normal current was bigger. At normal current of 60 A （ less than the half of Ic ） , the recovering time reached 21 times the duration of impact.

关 键 词：高温超导 工频 过电流 失超 恢复 温度 

分 类 号：O511[理学—低温物理]