J. Phys. III France
Volume 6, Numéro 12, December 1996
Page(s) 1775 - 1783
DOI: 10.1051/jp3:1996213
J. Phys. III France 6 (1996) 1775-1783

Inter-Strand Coupling Losses in Superconducting Power Cables Without Coaxial Magnetic Shielding

S. Stenger1, P. Manuel2 and F. Bouillault1

1  Laboratoire de Génie Électrique de Paris, ESE, CNRS, Universités Paris VI et XI, Plateau du Moulon, 91192 Gif sur Yvette Cedex, France
2  Électricité de France, DER, 1 avenue du Général de Gaulle, 92141 Clamart Cedex, France

(Received 4 June 1996, revised 19 September 1996, accepted 20 September 1996)

This paper deals with computations of inter-strand coupling losses in superconducting power cables with Room Temperature Dielectric (RTD), in which no coaxial shielding of magnetic field is provided. In three-phase circuits, magnetic fields produced by neighbouring phases induce in the third one significant currents through contact resistances between strands, owing to their helical winding around the cable axis with a pitch inversion between each layer. Analytic expressions are first derived for a simple cable model, with only two strand layers (single "bilayer"), with or without taking internal screening effects into account. The validity limit of these computations is determined. Then a generalization to a real n-layer is proposed and the development shows that a homogenization procedure can be performed on the radial coordinate, in some specific cases.

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