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      저자 : 이병택(Bying-Taek Lee) (검색결과 2 건)
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      • 초고압, 장갭의 불평등전계에서 SF?/N₂혼합가스의 절연내력 시뮬레이션

        이병택(Bying-Taek Lee),황청호(Cheong-Ho Hwang),허창수(Chang-Su Huh),장용무(Yong-Moo Chang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11

        SF? is the most commonly used insulating gas in electrical systems. But In these days SF? mixtures and alternative gas has been studied because of global warming. so although many studies have been carried out about binary gas mixtures with SF?, few studies were presented about breakdown characteristics of SF?/N₂ mixtures. At present study the breakdown characteristics of SF?/N₂ mixtures in Non-uniform field was performed. In this paper, breakdown experiment values and breakdown simulation value are compared. Streamer theory was used for predicting breakdown voltage. For accurate simulation field factor this simulation apply E field value using Finite Elements Method to field utilization. AC breakdown experiments in non-uniform field was performed to compare with the breakdown simulation values. The pressure range of gas mixtures was 0.4 MPa to 0.6 MPa. The rod-plane was used and mixture ratio is SF? 20% : N₂ 80%. The gap lengths is 10㎜ to 70㎜. In the result, it was observed that an increase in the dielectric strength is attained through the addition of pressure and gap lengths. But with gap lengths increasing, the breakdown voltage is saturated.

      • 초고압,장갭의 불평등전계에서 SF?/N₂혼합가스의 절연내력 시뮬레이션 및 실험값와의 비교

        이병택(Bying-Taek Lee),황청호(Cheong-Ho Hwang),허창수(Chang-Su Huh),이기택,장용무(Yong-Moo Chang) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

        SF? is the most commonly used insulating gas in electrical systems. But In these days SF? mixtures and alternative gas has been studied because of global warming. so although many studies have been carried out about binary gas mixtures with SF?, few studies were presented about breakdown characteristics of SF6/N2 mixtures. At present study the breakdown characteristics of SF6/N2 mixtures in Non-uniform field was performed. In this paper, breakdown experiment values and breakdown simulation values are compared. Streamer theory was used for predicting breakdown voltage. For accurate simulation field factor, this simulation apply E field utilization using cst program AC breakdown experiments in non-uniform field was performed to compare with the breakdown simulation values. The pressure range of gas mixtures was 0.4 ㎫ to 0.7 ㎫. The rod-plane was used and mixture ratio is SF6 20% : N2 80%. The gap lengths is 10㎜ to 70㎜. As pressure increase, this simulation value do not correspond to the experiment value. So this simulation apply to utilization factor using CST program In the result, it was observed that breakdown voltage increase as pressure and gap lengths increase. But with gap lengths increasing, the breakdown voltage is saturated. So simulation need surface roughness factor.

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