Fabrication and Characteristics of 2G HTS Current Leads

Author

Sohn, Myung-Hwan ; Kim, Seokho ; Sim, Kideok ; Bae, Joon-Han ; Lee, Seok-Ju ; Park, Hae-Yong

Author_Institution

Korea Electrotechnol. Res. Inst., Changwon, South Korea

Volume

20

Issue

3

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

1755

Lastpage

1758

Abstract

2nd generation high temperature superconducting (2G-HTS) tape consists of multi-layers such substrate, buffer layer, superconducting layer and reinforced lamination tapes. 2G HTS tape is a candidate of good materials for current lead of superconducting magnet system owing to its low thermal conductivity. However, joint resistance between 2G HTS tapes and terminal block can be a major problem because of high electrical resistivity of substrate, buffer layer and reinforced lamination tapes of 2G HTS. So specially considering joint resistance between 2G tapes and terminal block, 2G HTS current lead for 400 A was designed and fabricated. This current lead was consisting of two terminal blocks, a support bar or tube, protection tube and six 2G HTS tapes. Its total length was 300 mm and body diameter 18.3 mm. At liquid nitrogen temperature (77 K) critical current (Ic) of this HTS current lead was 600 A, about 1.5 times the operating current 400 A. Conductive heat loss of 2G HTS current lead between 60 K and 7 K was 50 mW.

Keywords

electric resistance; high-temperature superconductors; magnetic superconductors; 2G HTS current leads; buffer layer; conductive heat loss; critical current; current 400 A; current 600 A; electrical resistivity; joint resistance; liquid nitrogen temperature; multilayers; protection tube; reinforced lamination tapes; second generation high temperature superconducting tape; size 18.3 mm; size 300 mm; superconducting layer; superconducting magnet system; support bar; temperature 60 K; temperature 7 K; temperature 77 K; terminal block; thermal conductivity; 2G HTS tape; Current lead; joint resistance; thermal conductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2010.2042588

Filename

5424101