Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Analysis of Predischarge Processes of $SF_6$ Gas Stressed by lmpulse Voltages under Nonuniform Electric Field

불평등전계중에서 임펄스전압에 대한 $SF_6$ 기체의 전구방전과정의 분석

  • 이복희 (인하대학교 전자전기컴퓨터공학부) ;
  • 이경옥 (인하대학교 전자전기컴퓨터공학부) ;
  • 이창준 (LG 산전(주) 연구소) ;
  • 백승권 (인재대학교 전자공학과)
  • Published : 2000.01.01
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Abstract

In this paper, the predischarge propagation processes of SF\ulcorner gas stressed by impulse voltages under nonuniform electric field perturbed by a needle protrusion are described. The statistical and formative time-lags and the time interval between leader pulses were investigated on the basis of the predischarge current measured in the gas pressure range of 0.1~0.5 MPa. The predischarge current is closely related to the waveform, amplitude and polarity of applied votages, the gas pressure and the gap geometry. Both the positive and negative predischarge processes in nonuniform electric field develop in a regime of stepwise leader propagation leading to electrical breakdown. The mean of the time interval between leader pulses gives about a factor of 10 higher for the negative than for the positive leader current puls-es. According as the gas pressure increases, the statistical time-lag was almost unchangeable, but the formative time-lag was gradually decreased.

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References

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