Abstract
We have investigated the effectiveness of the insertion of a low thermal conductive layer (LTCL) in a tri-axial High Temperature Superconducting (HTS) cable to realize a long-distance tri-axial HTS cable. This study analyzed the relationship among intrusion heat from outside of the cable, AC loss, temperature distribution, and the maximum temperature within a tri-axial HTS cable with the LTCL to clarify the suitable insertion position and thickness of the LTCL for a long-distance tri-axial HTS cable. Analysis results showed that inserting the LTCL inside the HTS layers was effective for the long-distance tri-axial HTS cable. In addition, there was a trade-off relationship between the effects of suppressing the thermal conduction from the outer refrigerant to the inner refrigerant and increasing the intrusion heat from outside of the cable by inserting the LTCL. The suitable thickness of the LTCL can be obtained by considering this trade-off relationship.
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