Numerical analysis of AC loss in high T/sub c/ twisted tape carrying AC transport current in external AC magnetic field. Effect of twisting on loss reduction

Author

Banno, N. ; Amemiya, N.

Author_Institution

Yokohama Nat. Univ., Japan

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2561

Lastpage

2564

Abstract

The effect of twisting in BSCCO tapes on the loss reduction is discussed by a numerical analysis using the finite element method. The optimal twist pitch giving the lowest loss for the tape carrying the AC current under the AC magnetic field is presented. The numerical analysis takes the smooth E-j characteristics, the twisted structure and the dynamic resistivity into account, which allows more accurate loss estimations. For the BSCCO tape with a typical dimension of 3 mm/spl times/0.2 mm, the optimal twist pitch is around 10 mm, when it is carrying the AC transport current with normalized amplitude I/sub t//I/sub c/=0.8, under the parallel magnetic field to the tape face.

Keywords

bismuth compounds; calcium compounds; eddy current losses; finite element analysis; high-temperature superconductors; strontium compounds; superconducting tapes; AC loss; AC transport current; BiSrCaCuO; dynamic resistivity; external AC magnetic field; finite element method; high T/sub c/ twisted tape; loss reduction; numerical analysis; parallel magnetic field; smooth E-j characteristics; twist pitch; twisting; Bismuth compounds; Conductivity; Conductors; Finite element methods; Magnetic fields; Multifilamentary superconductors; Numerical analysis; Superconducting films; Superconducting transmission lines; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.785009

Filename

785009