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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Junil (Department of Electrical Engineering, Korea National University of Transportation) Lee, Onyou (Department of Electrical Engineering, Korea National University of Transportation) Mo, Young Kyu (Department of Electrical Engineering, Korea National University of Transportation) Bang, Seungmin (Department of Electrical Engineering, Korea National University of Transportation) Kang, Jong O (Department of Electrical Engineering, Korea National University of Transportation) Lee, Hongseok (Department of Electrical Engineering, Korea National University of Transportation) Nam, Seokho (Department of Electrical Engineering, Applied Superconductivity Lab, Yonsei University) Kang, Hyoungku (Department of Electrical Engineering, Korea National University of Transportation)
저널정보
한국초전도저온학회 한국초전도·저온공학회논문지 한국초전도·저온공학회논문지 제17권 제3호
발행연도
2015.1
수록면
33 - 36 (4page)

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A liquid nitrogen ($LN_2$) is usually used to be a coolant and insulant for a HTS coil system. HTS wires for a superconducting apparatus may be surrounded by gaseous nitrogen ($GN_2$) due to film boiling generated by a quench or voids occurred by electrical breakdown. The increased maximum electric field intensity at $GN_2$ may result in the degradation of dielectric strength of a HTS coil system. In this paper, a study on the dielectric characteristics of a composite insulation system composed of $LN_2$ and $GN_2$ is performed. A sphere-to-plane electrode system made with stainless steel is used to perform the experiments under AC and lightning impulse voltage condition. A sphere electrode is surrounded by $GN_2$ and a plane electrode is immersed into $LN_2$ to conduct dielectric experiments with a composite insulation system. The dielectric experiments are performed according to the level of $LN_2$ from the plane electrode to a sphere electrode. It is found that the dielectric characteristics of a composite insulation system are dependent on the level of $LN_2$ and the field utilization factor of an electrode system.

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