We have been developing AC 1kA-cass HTS current leads for superconducting fault current limiters. In this paper, the cooling effect of multiple helium gas-cooled current leads connected in parallel is investigated exerimentally. A numerical analysis is also carried out to determine the relation-ship between the geometry of the current leads and the magnitude of heat flow into a cryostat. In the analysis, AC loss caused by both mutual and self-induced magnetic fields of the multiple HTS (BSCCO) current leads, and the joule heat generated by the contact ressistance at the joints of NbTi/CuNi superconducting cables (e.g. AC superconducting devices) to the HTS current leads are taken in account. From the experimental and analyatical results, it is determined that the cooling effect by helium gas depends on the HTS current leads geometry.
展开▼
