고온초전도 시스템 냉각용 고화질소의 기초 절연 특성 : The Basic Insulation Characteristics of Solid-Nitrogen for Cryocooling of HTS Systems
The Basic Insulation Characteristics of Solid-Nitrogen for Cryocooling of HTS Systems
- 주제(키워드) High Temperature Superconductor , Insulation , Solid nitrogen , Breakdown , Cryogenics
- 발행기관 대한전기학회
- 발행년도 2009
- 총서유형 Journal
- UCI G704-000119.2009.58.1.012
- KCI ID ART001308043
- 본문언어 한국어
초록/요약
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.
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