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The Basic Insulation Characteristics of Solid-Nitrogen for Cryocooling of HTS Systems  

Choi, Jae-Hyeong (경상대학교 전기공학과 및 공학연구원)
Choi, Jin-Wook (경상대학교 전기공학과 및 공학연구원)
Lee, Hai-Gun (고려대학교 신소재공학부)
Song, Jung-Bin (고려대학교 신소재공학부)
Kim, Hae-Jong (한국전기연구원 초전도연구센터)
Seong, Ki-Chul (한국전기연구원 초전도연구센터)
Kim, Sang-Hyun (경상대학교 전기공학과 및 공학연구원)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.58, no.1, 2009 , pp. 132-136 More about this Journal
Abstract
Recently, for improvement of the magnetic field of high temperature superconductor (HTS) apparatus, many studies investigating on operating in the range of $20{\sim}65\;K$ 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.
Keywords
High Temperature Superconductor; Insulation; Solid nitrogen; Breakdown; Cryogenics;
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Times Cited By KSCI : 1  (Citation Analysis)
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