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불평등 전계에서 SF₆/CF₄ 혼합가스의 절연내력과 PD특성
黃靑虎(Cheong-Ho Hwang),成許慶(Heo-Gyung Sung),許昌洙(Chang-Su Huh) 대한전기학회 2008 전기학회논문지 Vol.57 No.4
New gas mixtures are now finding applications such as interrupting media for high-voltage circuit breakers. These mixtures consist of a high content of carbon tetrafluoride(CF₄) added to sulfur hexafluoride(SF?). Nowdays SF? has been established for the use in gas insulated substations due to its high insulation withstand level and good arc quenching capability. At this paper Breakdown characteristics were investigated for SF?/CF₄ mixtures when AC voltage and standard lightning impulse voltage(LI) was applied in a needle - plane electrodes. And partial discharge (PD)experiments were carried out in the test chamber which was made in needle - plane electrode. And Φ-Q-N distribution of partial discharge signals was analyzed. The total pressure of the SF?/CF₄ mixtures was varied within the range of 0.1 - 0.5 Mpa in the test chamber. The breakdown voltage in needle - plane electrode displayed N shape characteristics for increasing the content of SF? at positive impulse voltage and the PD inception voltage was increased slightly when pressure of SF?/CF₄ Mixtures was increased. Maximum PD inception voltage is showed in 80% SF6/20%CF₄..
불평등 전계에서 표준 뇌 임펄스 전압의 SF. /CF₄ 혼합 가스의 절연 내력
허창수(Chang-Su Huh),성허경(Heo-Gyung Sung),박신우(Shin-Woo Park),황청호(Cheong-Ho Hwang),김남렬(Nam-Ryul Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
In these days SF. mixtures and alternative gas have been studied because of global warming and liquefying at low temperature and high pressure. At present work the breakdown characteristics of SF. /CF₄ mixture in non-uniform field was performed. The experiments were carried out under positive and negative standard lightning impulse (SLI) voltages. The point-plane electrode was used with 3 ㎜ gap distance in the test chamber. The SF. /CF₄ mixture which contain 20% of SF. was compared with pure SF. and CF₄ gas. Experimental gas pressure ranged from 0.1 to 0.4 ㎫. The breakdown voltage under negative SLI is higher than the breakdown voltage under positive voltage. And the breakdown voltage of SF. 20%, CF₄ 80% mixture is similar to that of pure SF. .
불평등전계에서 SF₆/CF₄ 혼합 가스의 SLI, AC 절연내력 특성
黃靑虎(Cheong-Ho Hwang),成許慶(Heo-Gyung Sung),許昌洙(Chang-Su Huh) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
Although many studies have been carried out about binary gas mixtures with SF?, few studies were presented about breakdown characteristics of SF?/CF₄ mixtures. At present study the breakdown characteristics of SF?/CF₄ mixtures in non-uniform field was performed. The experiments were carried out under AC voltage and standard lightning impulse (SLI) voltage. Breakdown characteristics were investigated for SF?/CF₄ mixtures when AC voltages and standard lighting impulse voltage was applied in a needle-plane. The needle-plane electrode whose gap distance was 3 ㎜ were used in a test chamber. SF?/CF₄ mixtures contained from 0 to 100% SF? and the experimental gas pressure ranged from 0.1 to 0.5 ㎫. The breakdown characteristics of SF?/CF₄ mixtures in non-uniform field may be influenced by defects like needle-shaped protrusions. In case of slowly rising SLI voltage and AC voltage it is enhanced by corona-stabilization. This phenomena caused by the ion drift during streamer development and the resulting space-charge is investigated. In non-uniform field under negative SLI voltage the breakdown voltage was increase linearly but under positive SLI voltage the breakdown voltage increase non-linearly. The breakdown voltage in needle-plane electrode displayed N shape characteristics for increasing the content of SF? at AC voltage. SF?/CF₄ mixture has good dielectric strength and arc-extinguishing properties than pure SF?. This paper presents experimental results on breakdown characteristics for various mixtures of SF?/CF₄ at practical pressures. We could make an environment friendly gas insulation material with maintaining dielectric strength by combing SF? and CF₄ which generates a lower lever of the global warming effect.