AC losses in a conduction-cooled LTS pulse coil with stored energy of 1 MJ for UPS-SMES as protection from momentary voltage drops

A. Kawagoe, S. Tsukuda, F. Sumiyoshi, T. Mito, H. Chikaraishi, T. Baba, M. Yokota, H. Ogawa, T. Hemmi, R. Abe, A. Nakamura, K. Okumura, A. Kuge, Masataka Iwakuma

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

AC losses in the conduction-cooled low temperature superconducting (LTS) pulse coil with stored energy of 1 MJ are estimated. The 1 MJ coil is a superconducting pulse coil for 1 MW, 1 sec UPS-SMES. UPS-SMES is an uninterruptible power supply (UPS) with superconducting magnetic energy storage (SMES) for protection of production lines of an industrial plant or large-scale experimental devices such as a fusion device, from a momentary voltage drop and an instant power failure. The winding conductor for the 1 MJ coil is a NbTi/Cu Rutherford cable, which is extruded with aluminum. The 1 MJ coil was wound by a new twist winding method. A 1 MJ coil was fabricated and cooling and excitation tests were carried out. In this paper, two methods to estimate ac losses in conduction-cooled LTS coils are proposed. One method estimates ac losses in the coil under steady-state conditions. The other method estimates ac losses in the coil under transient-state conditions. For estimation of ac losses in the 1 MJ coil, measurement of temperature in the coil during tests and thermal analysis using the two-dimensional finite element method are compared. These procedures clarified that the 1 MJ coil has low losses.

Original languageEnglish
Article number4497938
Pages (from-to)783-786
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume18
Issue number2
DOIs
Publication statusPublished - Jun 1 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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