Current distribution mapping in insulated (Gd,Y)BCO based stabilizer-free coated conductor after AC over-current test for R-SFCL application

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Kar, Soumen^1,2 ; Li, Xiao-Fen^1 ; Selvamanickam, Venkat^1 ; Rao, V.V.^2

Department of Mechanical Engineering, Texas Center for Superconductivity (TcSUH), University of Houston, Houston

TX

77204, United States^1

Applied Superconductivity Laboratory, Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur, West Bengal

721302, India^2

关键词: Critical current distribution;    Current density distribution;    Current distribution;    Field distribution;    High temperature superconducting tape;    Nondestructive methods;    Resistive type superconducting fault current limiter;    Scanning hall probe microscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012118/pdf
DOI  :  10.1088/1757-899X/171/1/012118

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Uniformity of critical current (Ic) over long lengths of (GdY)-Ba-Cu-O ((Gd,Y)BCO)-based high temperature superconducting (HTS) tapes after long periods of AC current excitation is an important criterion in their selection for resistive type superconducting fault current limiter (R-SFCL). The present work describes such critical current (Ic) uniformity measurements performed over 1m long, stabilizer-free (SF), 12 mm wide, 2ndgeneration (2G) (Gd,Y)BCO based HTS tape. A non-destructive method using a static hall probe (Tapestar®) with moving HTS tape configuration was employed for estimation of Icuniformity. Scanning Hall probe microscopy (SHPM) was then used to examine the weak superconducting regions (i.e. less Ic) with a static HTS tape. Remanent field distribution on the HTS tape was measured to yield the critical current density distribution. Except for small degradation of Icat some locations, these studies confirmed near-uniform critical current distribution over meter-long (Gd,Y)BCO tapes, both in virgin state and after exposure to AC over current.