高温超导YBCO线圈交流损耗的频率特性

YBCO线圈的交流损耗直接关系到YBCO设备的运行成本及稳定性。实现对YBCO线圈交流损耗的快速、准确测量,对于开展YBCO涂层导体的应用研究具有重要的意义。文中采用电测量法,在77K、零场和不同频率条件下,对YBCO线圈通以不同运行电流时产生的交流传输损耗进行测量。构建了YBCO线圈交流损耗的数值计算模型,对YBCO线圈交流损耗进行理论研究,最后将实验数据与理论计算结果进行比较,两者结果基本一致。可以发现,YBCO线圈在频率低于75Hz时,交流传输损耗随频率的增大而减小,当频率从75Hz增加到195Hz时,交流传输损耗随频率的增大而增加。

Frequency characterization of AC loss of YBCO coils

AC losses of YBCO coils are directly related to the running costs and the stability of YBCO devices.It is of great importance to measure the AC losses of YBCO coils quickly and accurately for the research of YBCO coated conductor applications.In this paper,based on electrical measuring method,under conditions of 77K,0T and different frequencies,AC losses of YBCO coils were measured under different operation current.A numerical model was developed to calculate AC losses of YBCO coils,and it was shown that the calculated values agreed with the measured results well.It is found that AC transport losses of YBCO coils decrease with the frequencies below 75Hz and increase with the frequencies from 75Hz to 195Hz.