The Characteristics of Frequency Spectrum of Radiated Electromagnetic Waves with AC Discharge Progress in Liquid Nitrogen

액체 질소중 교류방전 진전에 따른 방사전자파의 주파수 스펙트럼 특성

  • 박광서 (영남대 전기공학부) ;
  • 윤대희 (영남대 전기공학부) ;
  • 이상훈 (영남대 전기공학부) ;
  • 이현동 (LG산전 전력연구원) ;
  • 김충년 (경운대) ;
  • 최병주 (서라벌대 전기과) ;
  • 김기채 (영남대 전자정보공학부) ;
  • 이광식 (영남대 전자정보공학부)
  • Published : 2003.03.01

Abstract

In this paper, a relationship between AC discharge progress and the radiated electromagnetic waves was investigated by measuring electromagnetic waves using a biconical antenna and a spectrum analyzer. The frequency spectrum of the radiated electromagnetic waves were measured at the atmospheric pressure in liquid nitrogen($LN_2$) during partial discharges progressed by AC high voltage in nonuniform electric field. Front the results of this study, a new method was introduced for measurement and analysis of the radiated electromagnetic waves with discharge progress in $LN_2$ Besides. according to the consideration of the mutual relation between frequency spectrum of the radiated electromagnetic waves and discharge progress, it was confirmed that detecting partial discharge and estimating discharge progress could be possible. It is considered that these results obtained from this investigation may be used as fundamental data for diagnosis and prediction of electric insulations about superconducting and cryogenic power equipments.

Keywords

discharge progress;electromagnetic waves;frequency spectrum;liquid nitrogen;insulation diagnosis

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