高温超导电缆层电流分布对电缆稳态运行特性的影响分析

Influence analysis of current distribution on steady-state performance of high temperature superconducting cable

为了分析冷绝缘高温超导电缆层电流分布对其稳态运行特性的影响,提出超导电缆的等效电路模型,给出求解各层电流的矩阵方程,应用超导电缆的温度分布计算模型和边界条件,获得不同均流效果下的超导电缆最大载流能力和稳态径向温升,并与有限元计算结果进行对比。结果比较表明,各层电流均衡分布不仅能提高电缆的载流能力,而且可以降低超导电缆的稳态运行温升,提高了超导电缆在稳态运行时的稳定性。

To analyze the influence of current distribution on steady state performance of cold dielectric high temperature superconducting（CD HTS） cable,the equivalent circuit model of HTS cable was proposed and the current distribution calculation model was given.Applying the numerical model of steady state radial temperature distribution and the boundary conditions,the current-carrying capacity and the steady state temperature characteristic of HTS cables with different current-sharing effect were obtained,the results were compared with that of the finite element method（FEM）.The compared results show that a uniform current distribution among layers can increase the current-carrying capacity as well as reduce the steady state temperature rise and improve the steady-state stability of HTS cable.