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超导线圈在电力设备中应用广泛。临界电流作为超导线圈的一项重要参数,在电力设备复杂的电磁环境中快速和准确预测线圈的临界电流是非常重要的。基于有限元(FEM),分别使用H方程模型与磁场(简称:MF)等效模型对一个双层的高温超导线圈临界电流进行了计算,两种模型的仿真结果一致,并分析了MF等效模型仿真快速高效的原因。将MF等效模型拓展至含分磁环的超导线圈中,进一步计算不同外场条件下分磁环对临界电流的影响,并发现分磁环影响下的端部电场激升是线圈临界电流下降的主要原因。
Superconducting coils are widely used in power equipment. Critical current As an important parameter of superconducting coils, it is very important to predict the critical current of the coil quickly and accurately in the complex electromagnetic environment of power equipment. Based on the finite element method (FEM), the critical current of a double-layer high temperature superconducting coil was calculated using the H-mode model and the magnetic field (MF) equivalent model, respectively. The simulation results of the two models were consistent and the MF The reason why model simulation is fast and efficient. The equivalent model of MF was extended to the superconducting coil with magnetic ring. The influence of the magnetic ring on the critical current under different external conditions was further calculated and it was found that the end electric field rise under the influence of the magnetic sub-ring was the decrease of the critical current of the coil The main reason.