Current test on a flexible superconducting core for a 2 GVA ac cable

✍ Scribed by K.G. Lewis; J. Sutton; C.W. Bibby; C.N. Carter; J.A. Noé

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 1019 KB
• Volume: 18
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(78)90173-x

✦ Synopsis

A 5 m long prototype co-axial flexible superconducting cable core has been made and tested at currents up to 30 kA. The inner and outer tubular conductors were both formed from helically-laid strips, and the dielectric between was lapped polyethylene tape. The dielectric was tested in separate experiments. The conductor strips contained layers of nobium, niobium-zirconium and high conductivity copper. The axial contraction of the cable core was restrained by titanium tie-rods and the lay angles of the conductor strips were chosen so that the core tightened radially on cooldown. Leadfilled termination cylinders between the ends of the cable and the current leads inhibited the formation and propagation of normal regions at high currents. Local and average ac loss measurements were made from 4.7 to 10.2 K and at current densities between 10 and 200 A mm -] with very satisfactory results.