The repeatability of superconducting DC limiters has not been introduced by other literature. Understanding the performance degradation characteristics of high-temperature superconducting (HTS) tapes under the overcurrent is of great significance for popularizing the application of a resistive-type DC superconducting fault current limiter. In this paper, the threshold experiment and repeated DC overcurrent experiment of HTS tape were carried out. With the critical current decay of the tapes under repeated DC overcurrent recorded, the current threshold under the DC overcurrent was obtained. And the performance degradation characteristics of the tapes under different repeated overcurrents were analysed, the resistance characteristics of the samples during different currents were compared. The results show that the DC overcurrent threshold of the copper-encapsulated second-generation (2G) YBCO tapes samples of Suzhou Advanced Materials Research Institute is 2.3/4 ms/3700 A. Under the repeated overcurrent, the performance degradation of the samples is abrupt, and the critical value is between 2.3/4 ms/3500 A and 2.3/4 ms/3550 A. The overcurrent has a limited influence on the magnitude of the resistance and will not affect the change trend of the resistance. The resistance at the falling edge of the current was greater than that at the rising edge of the current. The simulation was carried out by using COMSOL Multiphysics, and the simulation results matched the experimental results. The life prediction model of the samples was established and it was found that there is a custom equation relationship between the reliability of superconducting tapes and the number of the overcurrent, and the performance decline of this kind of samples is catastrophic.

其他文献尚未介绍超导直流限制器的可重复性。了解高温超导（HTS）胶带在过流下的性能退化特性，对于推广电阻式直流超导故障限流器的应用具有重要意义。本文进行了高温超导胶带的阈值实验和重复直流过流实验。记录反复直流过电流下磁带的临界电流衰减，得到直流过电流下的电流阈值。并分析了胶带在不同重复过电流下的性能退化特性，比较了样品在不同电流下的电阻特性。结果表明，苏州高新材料研究院二代（2G）YBCO铜包覆带样品直流过流阈值为2.3/4 ms/3700 A，在反复过流下，样品性能急剧下降，临界值在2.3/4 ms/3500 A和2.3/4 ms/3550 A之间。过流对电阻大小的影响有限，不会影响电阻的变化趋势。电流下降沿的电阻大于电流上升沿的电阻。使用 COMSOL Multiphysics 进行仿真，仿真结果与实验结果相符。