【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.更多还原

【Abstract】 In this paper, the quenching and recovering Characteristics of stainless-steel reinforced multifilamentary 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.更多还原