Development of a superconducting transformer for rolling stock

Hiroshi Hata, Hiroki Kamijo, Hiroyuki Fujimoto, Ken Nagashima, Kazuya Ikeda, Masataka Iwakuma, Kazuo Funaki, Hisao Yamada, Yasutaka Sanuki, Akira Tomioka, Kenetsu Uwamori, Shigeru Yoshida

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Having undertaken studies into a lightweight and highly efficient superconducting transformer for rolling stock, we developed a prototype with a primary winding, four secondary windings and a tertiary winding using bismuth (Bi-2223) high temperature superconducting wire. Its primary voltage is 25kV, which is widely adopted as the catenary voltage on the world's high-speed lines. We adopted liquid nitrogen cooling, the weight being 1.71t excluding the refrigerator. The maximum output available to maintain superconductivity is 3.5MVA. This paper describes the transformer details and test results.

Original languageEnglish
Pages (from-to)24-27
Number of pages4
JournalQuarterly Report of RTRI (Railway Technical Research Institute) (Japan)
Issue number1
Publication statusPublished - Feb 2006

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering


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