A large scale approach of bulk HTS to the electric utility area

Author

Werfel, F.N. ; Flogel-Delor, U. ; Wippich, D. ; Rothfeld, R.

Author_Institution

Adelwitz Technologiezentrum GmbH, Germany

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2018

Lastpage

2021

Abstract

On the basis of a novel industrial-like YBCO seedless functional melt texture grain alignment process, various HTS devices for superconducting magnetic bearings (SMB) and high-current leads for transport and limiting purposes are fabricated. Critical shielding currents of 30 kA/cm/sup 2/ at 77 K are utilized to construct radial-passive magnetic bearings for 20 kg loads or to suspend and spin a O 4 cm rotor safely to 120000 rpm. Stiffnesses between 40 to 140 N/mm are measured. Multi-grain YBCO rods up to 20 cm length are tested for more than 6 kA/cm/sup 2/ transport currents. The connections to the copper braids are improved to less than 0.4 micro-ohm at 1000 Amperes and 77 K. The experiments show the practical potential of melt textured YBCO with macroscopic orientation of the grain structure for electric power purposes.

Keywords

barium compounds; critical currents; crystal microstructure; high-temperature superconductors; machine bearings; magnetic bearings; melt texturing; rotors; superconducting cables; superconducting machines; superconducting magnets; yttrium compounds; 0 to 20 cm; 1000 A; 20 kg; 77 K; YBaCuO; bulk HTS; critical shielding currents; electric utility area; grain structure; high temperature superconductors; high-current leads; large scale approach; melt texturing; radial-passive magnetic bearings; rotor; seedless functional melt texture grain alignment; superconducting magnetic bearings; transport currents; Conducting materials; Critical current; High temperature superconductors; Large-scale systems; Magnetic levitation; Magnetic materials; Superconducting magnets; Superconducting materials; Thermal conductivity; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784860

Filename

784860