Effect of high voltage electrical breakdown on critical current of High Temperature Superconducting tapes

[摘要] Effects of high voltage electrical impulse events on the critical current of 2G HTS tapes are studied experimentally to develop an understanding on the potential damage that could occur if superconducting cables undergo electrical breakdown. The need for understanding the degradation is discussed in the context of the superconducting gas insulated lines (S-GIL), a novel design concept for superconducting cables. Since the S-GIL uses the gaseous cryogen as the sole insulation system which does not degrade in an electrical breakdown event, it is essential that the superconducting tapes themselves stay undamaged for the HTS cable system as a whole to be operational after electrical breakdown. Critical current of 2G HTS tapes were measured before and after subjecting them to electrical impulses at various voltage levels. It is shown that the extent of degradation depends on the number and voltage level of the impulses. The results of degradation of critical current are discussed in terms of the total energy released in an impulse event.

[发布机构] Center for Advanced Power Systems, Florida State University, Tallahassee; FL, United States^1;Department of Electrical and Computer Engineering, FAMU-FSU College of Engineering, Tallahassee; FL, United States^2;Georgia Institute of Technology, Atlanta; GA, United States^3

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Electrical breakdown;Electrical impulse;Gas insulated lines;High temperature superconducting tape;Insulation system;Novel design;Total energy;Voltage levels