Development of a large-capacity superconducting cable for 1000 kVA-class power transformers

Author

Funaki, K. ; Iwakuma, M. ; Satoh, S. ; Hiramatsu, M. ; Takeo, M. ; Yamafuji, K. ; Nonaka, S. ; Hoshino, M. ; Simada, M. ; Yoneda, E.S. ; Sasaki, T. ; Fujioka, T. ; Kumano, T. ; Suzuki, E.

Author_Institution

Fac. of Eng., Kyushu Univ., Fukuoka, Japan

Volume

28

Issue

1

fYear

1992

fDate

1/1/1992 12:00:00 AM

Firstpage

394

Lastpage

397

Abstract

A large-capacity superconducting cable for 1000-kVA-class power transformers has been designed and fabricated. The cable is a triply stacked multistrand (6×6×6) type. The elementary strand has 19050 NbTi filaments 0.63-mm thick in a CuNi matrix. The test cable is installed as the secondary winding in a superconducting transformer with iron core in a room-temperature space. The primary winding is the second-level subcable of the secondary one and the turn ratio is nearly 14. The designed capacity of the test cable is 4.545 kA at the secondary voltage of 220 V. The peak value of the current, 6.43 kA, is 78% of the critical current on the load line. The maximum current of the cable at 60-Hz operation was 3.78 kA (peak). The experimental results suggest that the degradation in maximum current of the test cable is related to current transfer between the cable and the copper terminal plate

Keywords

power transformers; superconducting cables; 1000 kVA; 220 V; 3.78 kA; 4.545 kA; 6.43 kA; 60 Hz; 60-Hz operation; CuNi matrix; NbTi filaments; NbTi-CuNi; cable capacity; critical current; current transfer; large-capacity superconducting cable; peak current; power transformers; secondary voltage; secondary winding; superconducting transformer; triply stacked multistrand cable; turn ratio; Critical current; Degradation; Iron; Niobium compounds; Power transformers; Superconducting cables; Superconducting filaments and wires; Testing; Titanium compounds; Transformer cores;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.119894

Filename

119894