| 摘要 |
A superconducting cable having a smaller outside diameter and a DC power transmission method utilizing this superconducting cable. The superconducting cable ( 1 ) comprises two stranded cable cores ( 2 ) each having a superconductor layer ( 4 ) of a superconducting material and an external superconducting layer ( 6 ) and contained in a heat insulating pipe ( 8 ). Each cable core ( 2 ) consists of a former ( 3 ), the superconductor layer ( 4 ), an insulating layer ( 5 ), the external superconducting layer ( 6 ), and a protective layer ( 7 ) arranged sequentially from the center. In the case of unipolar transmission, the superconductor layers ( 4 ) provided to both cores ( 2 ) are fed with an unipolar current and used as a supply line and the external superconducting layers ( 6 ) provided to both cores ( 2 ) are fed with a return current and used as a return line. In the case of bipolar transmission, the superconductor layer ( 4 ) provided to one core ( 2 ) is used for positive pole transmission, the superconductor layer ( 4 ) provided to the other core ( 3 ) is used for negative pole transmission, and the external superconducting layers ( 6 ) of both cores ( 2 ) are used as a neutral line layer.
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