Title :
Proposal of transformer using magnetic shielding with bulk high Tc superconductors
Author :
Fukuoka, Katsuhiro ; Hashimoto, Mitsuo
Author_Institution :
Dept. of Electr. Eng., Polytech. Univ., Kanagawa, Japan
fDate :
6/1/2004 12:00:00 AM
Abstract :
As for a general transformer using a ferromagnetic core, the magnetic flux may leak by using the high frequency and the overload. When the magnetic flux leaks from the core, the secondary voltage and its power transfer efficiency decrease. Bulk high Tc superconductors (HTS´s) with the high critical current density have the strong magnetic shielding characteristic at the static magnetic field and the AC magnetic field. Thus, we examined to surround a magnetic circuit of a transformer with bulk HTS´s. From this research, when the magnetic circuit of the transformer was surrounded with plural HTS´s, it was confirmed that the secondary voltage and the power transfer efficiency of the transformer increased especially in the high frequency range.
Keywords :
critical current density (superconductivity); ferromagnetic materials; high-temperature superconductors; magnetic shielding; power transformers; transformer magnetic circuits; AC magnetic field; bulk high temperature superconductors; critical current density; ferromagnetic core; magnetic circuit; magnetic flux; magnetic shielding characteristic; power transfer efficiency; secondary voltage; static magnetic field; transformer; Frequency; High temperature superconductors; Magnetic circuits; Magnetic cores; Magnetic flux; Magnetic shielding; Proposals; Shape; Superconductivity; Transformer cores; High-temperature superconductors; magnetic circuits; magnetic shielding; transformers;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.830442