Stability, Inter-Strand Contact Resistance, and AC Losses in YBCO Roebel Cables

Author

Majoros, Milan ; Sumption, M.D. ; Collings, E.W. ; Long, Nicholas J.

Author_Institution

Dept. of Mater. Sci. & Eng., Ohio State Univ., Columbus, OH, USA

Volume

24

Issue

3

fYear

2014

fDate

Jun-14

Firstpage

1

Lastpage

5

Abstract

A dc transport current was applied to the strands of a Roebel cable at 77 K in liquid nitrogen bath. The inter-strand contact resistance was measured. It was modified either by applying a pressure on the cable at 77 K in liquid nitrogen bath or using different soldering patterns between the strands of the cable. Magnetization ac losses were measured in frequency range 50-200 Hz in applied magnetic field 4-70 mT perpendicular to the broader face of the cable to test the inter-strand contact resistance effect. High stability and very low level of coupling losses were observed in the cables even with the lowest inter-strand resistances.

Keywords

barium compounds; contact resistance; high-temperature superconductors; magnetisation; superconducting cables; yttrium compounds; Roebel cable strands; YBCO; YBCO Roebel cables; applied magnetic field; coupling loss level; coupling loss stability; dc transport current; frequency 50 Hz to 200 Hz; interstrand contact resistance effect; liquid nitrogen bath; magnetization ac losses; soldering patterns; temperature 77 K; Couplings; Current measurement; Loss measurement; Resistance; Superconducting cables; Tin; Voltage measurement; Current sharing; Roebel cable; YBCO; stability; superconductor;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2013.2283472

Filename

6609042