| 摘要 |
The invention offers a superconducting cable having a further decreased cable diameter and a DC transmission system incorporating the superconducting cable. A superconducting cable 1 has a structure in which two cable cores 2, each having a superconducting conductor layer 4 and an outer superconducting layer 6 both made of a superconducting material, are twisted together and housed in a heat-insulated pipe 8. Each cable core 2 has a former 3, a superconducting conductor layer 4, an insulating layer 5, an outer superconducting layer 6, and a protecting layer 7 in this order from the center. In unipolar transmission, the superconducting conductor layers 4 of both cores 2 are used as the outward line, which carries the unipolar current, and the outer superconducting layers 6 of both cores 2 as the return line, which carries the return current. In bipolar transmission, the superconducting conductor layer 4 of one core 2 is used for the transmission for the positive pole, the superconducting conductor layer 4 of the other core 2 is used for the transmission for the negative pole, and the outer superconducting layers 6 of both cores 2 are used as the neutral-line layers. |
