Investigation of the Key Factors Affecting the Permanent Damage of the REBCO Coated Conductor in Overcurrent Condition

Author

Ju Hui Choi ; Yoon Hyuck Choi ; Dong-Hyung Kang ; Yeonjoo Park ; Jung-Bin Song ; Sun-Kyoung Ha ; Minwon Park ; Haigun Lee

Author_Institution

Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea

Volume

25

Issue

3

fYear

2015

fDate

Jun-15

Firstpage

1

Lastpage

5

Abstract

The effects of inhomogeneous critical current (I_c) and n-value on the degradation or permanent damage of REBCO coated conductors (CCs) were investigated through repetitive quench tests and overcurrent tests. In the repetitive quench tests, the I_c values of the REBCO CC samples at the sections with the high n-values were degraded easily due to the existence of thermal stress. Furthermore, the overcurrent test results showed that the REBCO CC samples burned out only at the section with the highest n-value, regardless of their I_c values and the manufacturing process. Therefore, this study confirmed that the n-value of an REBCO CC is one of the essential factors affecting the degradation or permanent damage of CCs in the overcurrent condition.

Keywords

barium compounds; critical currents; high-temperature superconductors; quenching (thermal); thermal stresses; REBCO coated conductor; inhomogeneous critical current effects; manufacturing process; overcurrent condition; permanent damage; repetitive quench tests; thermal stress; Conductors; Degradation; Heating; Integrated circuits; Nonhomogeneous media; Yttrium barium copper oxide; ${mmb n}$-value; Critical current; REBCO CC; REBCO coated conductors (CCs); damage; degradation; inhomogeneity; n-value;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2014.2365110

Filename

6936875