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A shell type superconducting transformer for experiments using Nb 3 Sn superconducting cables
Author(s) -
Kishida Takuya,
Kaito Takashi,
Haraguchi Eiji,
Morita Masao,
Fujiwara Yasuo,
Kubo Yoshio,
Nakamura Shiro,
Yamada Tadatoshi
Publication year - 1997
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(199702)118:3<13::aid-eej2>3.0.co;2-s
Subject(s) - electromagnetic coil , materials science , superconductivity , transformer , electrical engineering , superconducting magnetic energy storage , voltage , composite material , nuclear magnetic resonance , superconducting magnet , condensed matter physics , engineering , physics
A shell‐type superconducting transformer was developed for experiments using Nb 3 Sn superconducting cables. The designed capacity is 667 kVA (single phase), the voltage is 440/220 V, the current is 1515/3030 A and the percent impedance is 16 percent. Main features of the transformer are as follows: (1) Magnetic field in superconducting coils is decreased by increasing the number of high and low coil groups. (2) Large‐scale superconducting cables are not needed when the number of high and low coil groups is increased. (3) Epoxy impregnated coils are used to withstand an electromagnetic force at 120 Hz. The Nb 3 Sn basic strand was manufactured by the internal tin diffusion process. The cable consists of seven insulated subcables, and the subcable consists of seven strands. The primary (HV) coil of the transformer was excited, in which the secondary (LV) coil was shortened. The primary current reached 1618 A rms without quenching, and the reached capacity corresponds to 712 KA. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (3): 13–21, 1997