| 摘要 |
<p>PROBLEM TO BE SOLVED: To cool efficiently the whole of a power cable line, by providing in the predetermined places of a cooling-water circulating route pressurizing pumps for compensating the pressure of a cooling water. SOLUTION: A cooling-water circulating route 4 piped along a power cable line comprises going and returning routes 5, 6. The going route 5 is connected with a water feeding pump 8 of a cooling station 7 to connect the returning route 6 with a water tank 9. After a cooling water in the water tank 9 is cooled by the cooling station 7, it is fed out therefrom by pressurizing it through the water feeding pump 8 to cool the power cable line in troughs 2, 3 by passing it through the going route 5 piped in the troughs 2, 3. Thereafter, the cooling water is turned in a U-shaped way in a folded portion 10 to return it to the water tank 9 via the returning route 6. The returned cooling water is cooled in the water tank 9 to thereafter feed it again into the going route 5 of the cooling-water circulating line 4. Thereby, making adjustable by pressurizing pumps 11, 12 the length of the power cable line and the differences between the elevations of power-cable-line laying places, the whole of the power cable line can be cooled efficiently by the minimum scale of the cooling station 7.</p> |
