Connecting Dinorwic pumped-storage power station to the grid system by 400 kV underground cables

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Connecting Dinorwic pumped-storage power station to the grid system by 400 kV underground cables

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Connection of the Dinorwic pumped storage station in Snowdonia to the 400 kV supergrid is to be made by two 400 kV cable circuits rather than by overhead lines because of the outstanding natural beauty of the area. The cables have 2500 mm2 copper conductors, oil-filled paper insulation and aluminium sheaths and will be cooled by circulating water in high density polyethylene pipes laid with the cables. Part of the cable route chosen runs along a narrow strip of land adjacent to the lower lake, and the system has been designed to transmit the peak demand of 2340 MVA through two circuits occupying a width of 2.1 m. The paper describes the design of the cables and of the water-cooled accessories and the tests to which they were subjected. The cooling-station designs are also described and the special methods of laying and jointing the cables in the restricted space available.

Inspec keywords: pumped-storage power stations; underground cables; cable laying; cooling; cable jointing; transmission networks

Other keywords: pumped storage power station; water cooled accessories; cable jointing; 400 kV cable circuits; cable laying; underground cables; cooling station design; cable design; connection

Subjects: Power system management, operation and economics; Pumped storage stations and plants; Power line supports, insulators and connectors

References

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      • Thelwell, M.J.: `A cable system model for the control of transient ratings of cable circuits', IEE International Conference on On-line Operation and Optimisation of Transmission and Distribution Systems, June 1976, London, p. 102–105.
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      • C47/1, Engineering Recommendation, December 1975.
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      • Beale, H.K.: `Flexible water pipes for high voltage cable cooling systems: A review of present practice and possible future developments', 3rd International Plastic Pipes Symposium, September 1974, Southampton.
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      • Arkell, C.A., Ball, E.H., Barton, A.H., Beale, H.K., Williams, D.E.: `The design and installation of cable systems with separate pipe water cooling', Paper 21.01, CIGRE, 1978.
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      • F.J. Miranda , H.W. Holdup , P.G.S. Wood . Development of 400 kV cable in Great Britain. IEEE Trans.
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