Analysis of perpendicular magnetic fields on a 1 MVA HTS transformer windings with flux diverters

Author

Kim, S.H. ; Kim, W.S. ; Min, W.G. ; Park, C.B. ; Lee, S.J. ; Kim, J.T. ; Lee, D.K. ; Choi, K.D. ; Joo, H.G. ; Hong, G.W. ; Han, J.H. ; Hahn, S.

Author_Institution

Seoul Nat. Univ., South Korea

Volume

14

Issue

2

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

932

Lastpage

935

Abstract

In high temperature superconducting (HTS) transformer with double pancake windings, the perpendicular component of leakage magnetic flux density (B_r) applied to HTS tapes of double pancake windings is larger than that of solenoid windings, which acts as a cause to decrease the critical current in HTS tape and increase AC loss. In this paper, in order to reduce the B_r applied to HTS windings, the use of ferrite flux diverters is presented. Flux diverters are located in between the primary windings and the secondary windings, and must be made of low-loss materials to minimize the heat. And electromagnetic analysis of a single-phase 1 MVA 22.9 kV/6.6 kV HTS transformer with flux diverters in HTS windings was accomplished. The variation of B_r applied to the secondary windings and magnetic flux density in flux diverters were analyzed by changing their relative permeability of flux diverters respectively. Suitable relative permeability of flux diverters to reduce B_r applied to HTS windings was selected, considering flux diverter losses by increment of B in flux diverters.

Keywords

divertors; high-temperature superconductors; magnetic fields; magnetic flux; superconducting tapes; superconducting transformers; transformer windings; 1 MVA; 22.9 kV; 6.6 kV; AC loss; HTS tapes; HTS transformer windings; double pancake windings; electromagnetic analysis; ferrite flux diverters; high temperature superconductor; leakage magnetic flux density; low-loss materials; perpendicular magnetic fields; primary windings; secondary windings; solenoid windings; Critical current; Ferrites; High temperature superconductors; Magnetic analysis; Magnetic fields; Magnetic flux density; Permeability; Solenoids; Superconducting films; Windings; Double pancake winding; HTS transformer; flux diverter;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2004.830322

Filename

1324946