Japan's first in-grid demonstration of a high-Tcsuperconducting cable system

Osamu Maruyama*, Tetsutaro Nakano, Shoichi Honjo, Michihiko Watanabe, Masayoshi Ohya, Takato Masuda, Hiroharu Yaguchi, Naoko Nakamura, Akito Machida

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


High-temperature superconducting (HTS) power cable has significant merits of compactness and large power transmission capacity. To evaluate its performance, safety and reliability, HTS cable system was constructed at Tokyo Electric Power Company's Asahi substation in Yokohama, and the HTS cable had been connected to a real grid from October 29, 2012 to December 25, 2013 for the first time in Japan. The in-grid operation had continued for more than one year without any accidental interruption of the operation or troubles of the system. It is concluded that the HTS cable system has good performance and stability for long term in-grid operation. This paper describes the result of the HTS cable demonstration and their characteristics.

Original languageEnglish
Pages (from-to)639-647
Number of pages9
JournalIEEJ Transactions on Power and Energy
Issue number8
Publication statusPublished - 2014
Externally publishedYes


  • Cooling system
  • High-temperature superconducting cable

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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