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.
When superconductive power device mn in power system, superconductive tapes maybe quench because of power system defauh, e.g. system short default, in the process of default, the tapes will endure large current and unbalance current, and endure electromagnetism, mechanical stress and caloric because of large current and unbalance current, so it is important for superconductive power device to research thermal impact to superconductive tapes. In the paper, we research the quenching and recovering Characteristics of YBCO tapes which are produced by American Superpower Company when a thermal impact is give to YBCO tapes. The result proves:the YBCO tapes will change beyond retrieve when its temperature exceeds 500K. Its critical current will go down along when its temperature reach to 30OK.
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