대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)

대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지

액체질소에서의 열적 기포에 의한 절연파괴기구

Thermal Bubble-Initiated Breakdown Mechanism of $LN_2$

  • 곽동주 (한국전기연구소 전기재료연구부 초전도연구구실) ;
  • 추영배 (한국전기연구소 전기재료연구부 초전도연구구실) ;
  • 류강식 (한국전기연구소 전기재료연구부 초전도연구구실) ;
  • 류경우 (한국전기연구소 전기재료연구부 초전도연구구실) ;
  • 윤문수 (한국전기연구소 전기재료연구부 초전도연구구실)
  • Kwak, Dong-Joo (Division of Electrical Materials, Korea Electrotechnology Research Institute) ;
  • Choo, Young-Bae (Division of Electrical Materials, Korea Electrotechnology Research Institute) ;
  • Ryu, Kang-Sik (Division of Electrical Materials, Korea Electrotechnology Research Institute) ;
  • Ryu, Wdd-Kyung (Division of Electrical Materials, Korea Electrotechnology Research Institute) ;
  • Yun, Mun-Soo (Division of Electrical Materials, Korea Electrotechnology Research Institute)
  • 발행 : 1989.07.21
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초록

Ac, dc and impulse dielectric strengths of $LN_2$ at 0.1MPa were investigated experimentally, referring to the behavior of thermally induced bubble, which might be generated at quenching condition of immerged-cooling superconducting devices. The experimental results show that the bubble shape under electric field stress depends significantly on the applied voltage waveform. With ac voltage, the breakdown voltage of $LN_2$ falls suddenly near to one of the saturated gas at the threshold heater power of boiling onset. In control to this, the reduction of impulse breakdown voltage with heater peter is gradual and the time to breakdown depends on the existence of thermal bubble. These breakdown characteristics can be explained satisfactorily by the bubble behavior under electric fields.

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