Title :
Development of conductors for superconducting generators
Author :
Ogawa, T. ; Uyeda, K. ; Takahashi, K. ; Saito, T. ; Tanaka, Y. ; Nagata, M. ; Kono, O. ; Kamata, K. ; Taniguchi, H.
Author_Institution :
Eng. Res. Assoc. for Sueprconductive Generation Equipment & Mater., Osaka, Japan
fDate :
3/1/1991 12:00:00 AM
Abstract :
Basic design studies are conducted for 7-MVA superconducting generators, and superconductors are developed. For generators, it is intended to develop a slow-response-excitation-type generator with emphasis placed on stability and higher current density, and a quick-response-excitation-type generator with reduction of AC loss for enhancing the excitation speed. Three kinds of NbTi field windings for these superconducting generators were designed and developed with targets set for the conductor size, critical current, AC loss, void fraction, etc. The development of a conductor processing technique, improvement of the heat treatment technique, and development of a composite stranded wire technique were pursued. For Nb3Sn conductors, research was conducted to enhance the current density of strands and their workability by a bronze process and an in situ process
Keywords :
AC generators; composite superconductors; critical currents; eddy current losses; heat treatment; magnetic leakage; superconducting machines; superconducting magnets; 70 MVA; A15 superconductor; Nb3Sn conductors; NbTi field windings; bronze process; composite stranded wire technique; conductor processing technique; design studies; excitation speed; heat treatment technique; higher current density; in situ process; quick-response-excitation-type generator; reduction of AC loss; slow-response-excitation-type generator; stability; superconducting generators; void fraction; workability; AC generators; Conductors; Critical current; Current density; Heat treatment; Niobium compounds; Stability; Superconducting filaments and wires; Superconductivity; Titanium compounds;
Journal_Title :
Magnetics, IEEE Transactions on
