The basic insulation characteristics of solid-nitrogen for cryocooling of HTS systems

Jae Hyeong Choi, Jin Wook Choi, Haigun Lee, Jung Bin Song, Hae Jong Kim, Ki Chul Seong, Sang Hyun Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, for improvement of the magnetic field of high temperature superconductor (HTS) apparatus, many studies investigating on operating in the range of 20-65 K with liquid helium or the conducting method using cryocooler are actively reviewed. Also, the cooling method using solid nitrogen as cryogen is being suggested. Since the nitrogen has very large specific heat in solid state, it is expected that it can be operated for a long time without a continuous supply of cooling energy. However, there are still insufficient data on the characteristics of solid nitrogen such as thermodynamic properties and liquid-solid phase change. Especially, there was almost no study done on the electrical insulation properties of solid nitrogen so far. In this study, solid nitrogen to find the electrical characteristics was made by using cryocooler and cryostat, and investigated the flashover discharge and breakdown. The results of this study will be useful as a basic data for electrical insulation design of the HTS system using solid nitrogen as cryogen.

Original languageEnglish
Pages (from-to)132-136
Number of pages5
JournalTransactions of the Korean Institute of Electrical Engineers
Volume58
Issue number1
Publication statusPublished - 2009 Jan

Keywords

  • Breakdown
  • Cryogenics
  • High temperature superconductor
  • Insulation
  • Solid nitrogen

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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