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

Cryogenic Engineering Conference 2017

材料科学;物理学

Cheetham, P.^1,2 ; Zhang, Z.^1 ; Kvitkovicova, M.^1 ; Wagner, J.^1,2 ; Kim, C.H.^1 ; Graber, L.^3 ; Pamidi, S.V.^1,2

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

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

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012021/pdf
DOI  :  10.1088/1757-899X/278/1/012021

学科分类：材料科学（综合）

来源: IOP

【 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.