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논문 기본 정보

자료유형
학술저널
저자정보
Kim, W.J. (Department of Electrical Engineering, Gyeongsang National University and Engineering Research Institute) Kim, H.J. (Superconductivity Research Center, Korea Electrotechnology Research Institute) Cho, J.W. (Superconductivity Research Center, Korea Electrotechnology Research Institute) HwangBo, S. (Department of Electronic and Photonic Engineering, Honam University) Kim, S.H. (Department of Electrical Engineering, Gyeongsang National University and Engineering Research Institute)
저널정보
한국초전도저온학회 한국초전도·저온공학회논문지 한국초전도·저온공학회논문지 제14권 제4호
발행연도
2012.1
수록면
32 - 35 (4page)

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A high-$T_c$ superconducting (HTS) DC application has advantages such as the ultimately lower loss, more compact dimensions, and large capacity compared to AC application. In order to optimize the insulation design of a HTS DC machines, it is important to understand the high voltage insulation and materials at cryogenic temperature. Polypropylene laminated paper (PPLP) has been widely used as an insulating material for HTS AC machines. However, the fundamental data under DC voltage have not been revealed satisfactorily until now. In this paper, we will discuss mainly on the breakdown and dielectric characteristics of PPLP in liquid nitrogen ($LN_2$). The polarity effects of DC and impulse voltage were studied by using the semi-rod to cylindrical electrode. The volume resistivity of PPLP in $LN_2$ was studied. Also, the space charge distribution at room temperature was studied. However, it is necessary to study this topic at cryogenic temperature in the near future.

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