螺旋形超导带材的直流冲击实验研究

基于超导直流电缆应用,针对第二代高温超导带材Re BCO开展了直流冲击实验。首先,通过改变冲击条件(冲击电流大小和持续时间)得到带材的耐直流冲击特性,确定可保证带材性能完好的最大冲击电流幅值(安全电流)及其相应冲击时间。随后,针对实际电缆中超导带材是以螺旋形态缠绕于支撑管上,设计实验研究超导带材螺旋角和螺旋直径对其临界电流和耐冲击特性的影响规律,发现带材所能承受的最大冲击电流幅值随冲击作用时长的增加而逐渐下降、过大的螺旋角和过小的螺旋直径均会对带材造成损伤,影响其通流能力。上述研究结果为电缆的后续设计和制造提供了必要的参考依据。

Experimental study on DC impact current of spiral superconducting tape

Based on the application of superconducting DC cable,DC impact current test was carried out for the second generation HTS tape ReBCO.Firstly,by changing the impact conditions of the magnitude and duration of the impact current to study the DC impact resistance characteristics of the selected strip,the maximum impact current amplitude of safe current and the corresponding impact time which could ensure the strip performance intact was determined.Subsequently,aiming at the fact that the superconducting strip was wound on the supporting pipe in spiral form,the influence of spiral angle and diameter on the critical current and overload characteristics of the superconducting strip was studied experimentally.It is found that the maximum impact current amplitude of the strip decreases gradually with the increase of the impact time.The larger helical angle and the smaller helical diameter will damage the strip and affect its flow capacity.The above research results can provide a necessary reference for the subsequent design and manufacture of cables.