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为了研究高温超导电流引线结构对交流损耗的影响,制作了2种不同结构的高温超导电流引线。基于Clem模型,把外部磁场对交流损耗的影响加以考虑。在电流引线截面上建立了坐标系统,通过采取坐标平移和坐标旋转,可以得到高温超导电流引线内部磁场分布。在以上基础上,建立矩形骨架(RSCL)和十二边形骨架(DSCL)两种不同结构的高温超导电流引线的交流损耗计算模型。运用MATLAB编写计算模型,计算两种不同结构的高温超导电流引线的交流损耗。最后,在液氮环境中采用电气方法进行两种不同结构电流引线交流损耗的实验测量。在不同的电流和不同频率下测量两种不同结构的电流引线的交流损耗,将理论结果和测量数据进行比较,并就结构对交流损耗的影响进行了分析。交流损耗计算结果表明,坐标转换模型比Norris模型更准确,十二边形骨架(DSCL)的交流损耗比矩形骨架(RSCL)小。
In order to study the influence of high-temperature superconducting current lead structure on AC loss, two kinds of high-temperature superconducting current lead wires with different structures were fabricated. Based on the Clem model, the influence of external magnetic field on AC loss is taken into account. A coordinate system is established on the current lead cross section. By taking coordinate translation and coordinate rotation, the magnetic field distribution inside the lead of high temperature superconducting current can be obtained. Based on the above, an AC loss calculation model of high temperature superconducting current lead wire with two different structures of rectangular skeleton (RSCL) and dodecagonal skeleton (DSCL) is established. Using MATLAB to write the calculation model, calculate the AC loss of two different structures of high temperature superconducting current lead. Finally, the experimental measurement of the AC loss of two different structure current leads was carried out by the electrical method in a liquid nitrogen environment. The AC loss of current leads of two different structures was measured at different currents and different frequencies. The theoretical results and the measured data were compared. The influence of structure on AC loss was analyzed. AC loss calculation results show that the coordinate transformation model is more accurate than the Norris model, and the AC loss of the dodecagonal skeleton (DSCL) is smaller than that of the rectangular skeleton (RSCL).