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在实际的超导电力装置运行过程中,超导带材可能由于电力系统中诸如系统短路故障等各种动态过程,承受短路大电流、不平衡电流的冲击,以及由此而产生的电磁、机械应力、热量的作用而失超,因此,研究热冲击对超导材料性能的影响对超导电力装置失超保护非常重要.本文以第二代高温超导(YBCO)带材为样品,模拟实际超导电力装置中带材的绝热环境,通过外加电源对超导带材进行热冲击,研究YBCO带材在不同情况的热冲击条件下的失超过程以及带材温度和超导性能的变化.试验结果表明:对于美国Superpower公司生产的YBCO工程带材,瞬时温度超导300K后,带材的临界电流下降,瞬时温度超过500K,带材可能出现烧断现象.
In actual superconducting power plant operation process, the superconducting tape may be due to the power system such as short circuit fault and other dynamic processes, to withstand short-circuit high current, the impact of unbalanced current, and the resulting electromagnetic, mechanical The effect of thermal shock on the performance of superconducting materials is very important for the quench protection of superconducting power devices.In this paper, the second generation of high temperature superconducting (YBCO) strip as a sample to simulate the actual Superconducting power unit in the adiabatic environment of the tape, the superconducting tape by thermal shock applied to study the YBCO tape under different conditions of thermal shock quenching process and the tape temperature and superconductivity changes. The experimental results show that for the YBCO engineering strip produced by the American Superpower Company, the critical current of the strip decreases after the instantaneous temperature superconducting 300K, and the instantaneous temperature exceeds 500K, the strip may be blown.