相同占空比不同排布方式REBCO超导电缆交流损耗特性研究

AC Loss Characteristics of REBCO Cables with Different Arrangements at the Same Duty Cycle

本研究运用有限元方法,基于Maxwell方程组数值建模,引入基于实验数据的power-law,研究了具有相同占空比的由24根REBCO超导带材组成的六种不同结构的REBCO高温超导电缆的交流损耗以及磁场分布情况,并进行了分析比较。在只考虑传输损耗时,当传输归一化电流大于0.65时,发现内八外射结构具有最小的传输损耗,多层方形堆叠结构交流传输最大;若只考虑外加垂直场情况,与传输损耗对比刚好相反;在外加0.03 T垂直场下,当传输归一化电流大于0.4时,内八外射结构具有最小的交流损耗,并且有很好的线性分布规律和缓慢的增长趋势。

In this paper,six REBCO cables with different arrangements at the same duty cycle are simulated on AC losses by the finite element FEM method based on the Maxwell equations and the power law based on experimental data.A comparative analysis is performed on the AC loss and magnetic field distribution of 24 strips at almost the same duty cycle.When only the transmission loss is considered,it is found that the double-layer regular dodecagon structure has the smallest transmission loss,and the square stack structure has the largest AC transmission.If only the external vertical field is considered,the contrast with the transmission loss is just the opposite;in addition to the 0.03T vertical field,when the transmission normalized current is greater than 0.4,the square stack has the smallest AC loss and has a good linear distribution law.