在高温超导的电力应用中,如超导电机、变压器等,多数情况下,高温超导带材在通以交流传输电流的同时还处于交变磁场中.此时,超导体的交流损耗不仅依赖于磁场的大小,还与磁场相对于超导带面的取向有关.本文在77K及工频50Hz情况下,实验研究了单根多芯Bi2223/Ag高温超导带及两带并联时的交流损耗随着外磁场与带面夹角的变化情况;以及交流磁场对临界电流的影响情况;并对单根带及两带并联的实验结果进行了比较与分析.
High temperature superconducting (HTS) tapes are promising in power application such as the motors and transformers etc.In most cases,the HTS tapes are exposed to an AC magnetic field and fed with an AC wansport current.The AC losses depend not only on the magnitude of the external magnetic field,but also on its orientation with respect to the tape surface.In this work,AC losses of the multifilamentary Bi2223/Ag tape,both for one tape and two tapes stack,are experimentally investigated as a function of field orientation with respect to the wide side of the tape at 77K and 50Hz power frequency.The influence of AC magnetic field on critical current are studied.And the experimental results for one tape and two tapes stack are given and cmmpared.
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