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高温超导带材应用于超导限流器、超导储能等超导电力装置时,会受到外界磁场的影响。在外界磁场的影响下,高温超导带材的临界电流会发生衰减,衰减程度由外界磁场的方向和强度决定。临界电流直接影响这些超导电力设备的性能,因此在背景磁场下开展高温超导带材临界电流实验研究就显得至关重要。在77 K温度、不同磁场方向(垂直磁场、平行磁场和30°倾斜磁场)以及不同磁场强度(0~0.9T)的外界条件下,采用四引线法测量了日本藤仓公司生产的REBCO高温超导带材临界电流的变化情况。详细介绍了临界电流特性测试平台的搭建和测量方法,最后基于REBCO超导带材临界电流的测试结果,分析了临界电流特征的变化规律,为高温超导带材应用于超导电力装置提供了参考。
High temperature superconducting tape used in superconducting flow restrictors, superconducting energy storage superconducting power devices, will be affected by the external magnetic field. Under the influence of external magnetic field, the critical current of high temperature superconducting tape will decay, and the degree of decay is determined by the direction and intensity of external magnetic field. The critical current directly affects the performance of these superconducting power devices. Therefore, it is very important to carry out the experimental study on the critical current of HTS tape in the background magnetic field. Under the conditions of 77 K temperature, different magnetic field directions (vertical magnetic field, parallel magnetic field and 30 ° gradient magnetic field) and different magnetic field strengths (0 ~ 0.9T), four-lead method was used to measure the REBCO high temperature superconductivity Lead tape critical current changes. Finally, based on the test results of the critical current of REBCO superconducting tapes, the changing rules of the critical current characteristics are analyzed. The results provide a theoretical basis for the application of HTS tapes to superconducting power devices reference.