Title :
Development and characterization of Bi-2223 conductors for HTS transformer applications
Author :
Leghissa, M. ; Rieger, J. ; Nanke, R. ; Oomen, M.P. ; Berthold, T. ; Neumuller, H.-W. ; Fischer, B. ; Gierl, J. ; Hassler, W. ; Schubert, M. ; Haas, V.
Author_Institution :
Corp. Technol., Siemens AG, Munich, Germany
fDate :
3/1/2001 12:00:00 AM
Abstract :
Multifilamentary Bi-2223 tapes for AC applications in HTS transformers are studied. By twisting the filaments in tapes with AgMg sheath and Ag matrix the parallel field AC loss at power frequencies is lowered by more the 50% for the optimum twist length of 10 mm. The critical current density of these conductors corresponds to >80% of the non-twisted tape. In order to achieve a larger loss reduction tapes with Ag-alloys and ceramic barriers are studied
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; losses; multifilamentary superconductors; strontium compounds; superconducting tapes; superconducting transformers; AC applications; Ag; Ag matrix; Ag-alloys; AgMg; AgMg sheath; Bi-2223; Bi2Sr2Ca2Cu2O8 ; Bi2Sr2Ca2Cu3O8 ; HTS; ceramic barriers; critical current density; multifilamentary tapes; optimum twist length; parallel field AC loss; transformer applications; twisted filaments; Conductors; Critical current; Critical current density; Current density; Fabrication; Frequency; High temperature superconductors; Loss measurement; Magnetic field measurement; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
