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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.

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