| 摘要 |
PROBLEM TO BE SOLVED: To reduce transmission losses by constructing a transmission line conductor from superconducting ceramics, providing a duct through which a low-temperature fluid flows, and keeping the conductor at critical temperature. SOLUTION: A transmission line conductor 1 is formed of a superconducting tubular material having a composition of Bi2 Sr2 CoCu2 O2 and a diameter of 200 mm. The conductor 1 is connected in a unit length of e.g. 10 m, via a flexible junction member 2 made of a metal of high conductivity such as copper, to constitute a desired line length of e.g. 400 m. An inner pipe 3 made of a copper pipe having an inner radius of about 100 mm and a Wall thickness of 4 mm is mounted inside the conductor 1, and supercooled liquid nitrogen 4 at 75 to 65 K is passed into the pipe at a flow rate of about 1.8 kg/s. Thereby a superconducting state is formed to obtain 100 A/mm<2> . An outer pipe 5 made of a steel pipe having an outside diameter of about 750 mm and a wall thickness of about 5 mm is used to surround the conductor 1 and the inner pipe 3 via an electrical insulator 6, and the inside is evacuated to hold electrical insulation. Three lines of the same constitution are used to constitute a transmission line of three phases, 200 kV, and 1 GW.
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