program abstracts
Saturday, 3F-11, 10:10-10:20
Current Distribution Effects in a 2.6 kA 2G-Robel Bar
Wilfried Goldacker
Antje Frank, Andre Kudymow, Reinhard Heller, Stanimira Terzieva, Andrea Kling, Curt Schmidt
Forschungszentrum Karlsruhe, Institut f. Techn. Physik, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen
Phone: +49 7247 824179, Fax: +49 7247 825398, e-mail: wilfried.goldacker@itp.fzk.de
Roebel bars are a practicable way for high current flat AC-cables with fully transposed strands which are very well suited for windings in magnets, transformers and rotating machinery. Quite recently a 1.1 m long cable made from 45 SuperPower 12 mm wide CC with a transport current of 2.6 kA (77 K, s.f.) was presented. The new improved design, stacking several CC in the individual strands, allows application of a much higher number of coated conductors for the same transposition width and a significant increase of the transport current. Among the necessary technical features of cables an inter-strand connection with acceptable coupling loss contribution has to be considered. A detailed investigation of the current distributions in the strands of the cable was performed and will be presented. Inhomogeneities were observed between the strands and along the strands and depend on how the strands touch each other. I a smaller and only 4 mm wide cable, the strand coupling resistancies were investigated more systematically applying an Ag filled resin and a pure resin. The pure resin allows fixing the touch contact between the strands. The reliability of this approach and the future prospects for further improvement of the cable properties will be discussed.
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