Title :
S-N transitions of QMG current limiting elements with metal coat
Author :
Morita, M. ; Tokunaga, T. ; Yang, C. ; Miura, O. ; Ito, D.
Author_Institution :
Adv. Technol. Res. Lab., Nippon Steel Corp., Kawasaki, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
To estimate the feasibility of resistive type FCL (fault current limiter) consisting of QMG (melt processed YBa/sub 2/Cu/sub 3/O/sub 7-x//Y/sub 2/BaCuO/sub 5/ composite bulk superconductor), S-N transitions of various metal-coated samples made from large bulk QMG were studied at 77.3 K and 87.3 K (boiling point of argon) using single rectangular pulse current. It was found that the metal coating dramatically improves the endurance of element against the current flow after S-N transition and that optimization of the endurance and resistance should be required to realize QMG-FCL.
Keywords :
barium compounds; copper compounds; fault current limiters; high-temperature superconductors; superconducting devices; yttrium compounds; 77.3 K; 87.3 K; QMG current limiting elements; S-N transitions; YBa/sub 2/Cu/sub 3/O/sub 7-x//Y/sub 2/BaCuO/sub 5/ composite bulk superconductor; YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/; argon boiling point; fault current limiter; melt processing; metal coat; metal coating; single rectangular pulse current; super-normal transition; Argon; Coatings; Current limiters; Electrical resistance measurement; Fault currents; Indium tin oxide; Pulse measurements; Steel; Superconducting materials; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
