• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.23 no.10
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• pp.804-808
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• 2010

In this paper, we studied the dielectric breakdown voltage characteristics by the AC withstand voltage test on using green insulation dry air instead of $SF_6$ insulation gas used in the GIB (gas insulated bus) of 362 kV GIS (gas insulated switchgear). The AC withstand voltage test applied to the standard KEPCO's 362 kV GIB with dry air insulation, and the equivalence of dielectric breakdown voltage for dry air and $SF_6$ gas were examined, and the empirical formulas of dielectric breakdown voltage for dry air were calculated, and the criterion of AC withstand voltage test for dry air insulation was derived. Using the criterion, dry air can be used instead of $SF_6$ gas for 362 kV GIB in the factory acceptance test was confirmed.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.11a
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• pp.230-230
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• 2009

가스절연 개폐장치 (Gas Insulated Switchgear : GIS)의 고체 스페이서에 경사 기능성 재료 (Functionally Graded Material : FGM)가 적용될 때, 절연성능이 크게 향상된다. 본 논문에서는 FGM 스페이서가 적용된 GIS의 전극 및 스페이서의 형상을 변경하여 최대전계를 완화시켰다. 이를 위해 완전요인실험 (Full Factorial Design : FFD)과 결합된 반응표면법 (Response Surface Methodology : RSM)의 최적화기법을 이용하여, 전극 및 스페이서의 최적 형상을 설계하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2089_2090
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• 2009

본 논문은 한전에서 사용되는 25.8kV 가스 절연 부하개폐기(이하 개폐기)에 대해 장기과통전시험, 부하전류 개폐 및 접점마모시험, 가스 기밀재 가속열화시험을 통해 신뢰성을 평가하였다. 국내 개폐기의 신뢰성 및 수명에 대한 척도를 평가한 결과, 모든 시료가 $B_{10}$ 수명 20년 이상을 보증할 수 있는 것으로 나타났다.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.4 no.1
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• pp.46-53
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• 1990

GIS(Gas-Insulated Switchgear)형 옥내변전소에 있어서 접지계의 구성은 접지도체를 포설할 수 있는 면적이 협소하기 때문에 특별한 설계방법이 요구된다. 본 논문에서는 접지망의 전위해석과 축소형 변전소의 접지계 설계기법을 제시하였고, 아울러 컴퓨터 시뮬레이션을 위한 프로그램을 작성하고 그 시뮬레이션 결과를 측정치와 비교하여 프로그램의 타당성을 입증하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.06a
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• pp.167-168
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• 2007

• Proceedings of the KIEE Conference
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• 2000.11c
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• pp.525-527
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• 2000

Ultra high frequency (UHF) signals caused by the bouncing motion of aluminium particles in the 352 kV gas-insulated switchgear (GIS) test chamber were measured in order to investigate the signal pattern against the applied voltage phase and ultra sonic signals.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.173-174
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• 1998

The temperature rise of high current GIS occur in the main conductors, in the electrical contacts and in the enclosures. We examine the main heat sources and estimate these effects on the temperature rise in GIS.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.415-417
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• 1999

Recently, Reliability of switching devices for transmission & substation system is very important. Therefore, We have investigated fault trend of switching devices from 1982 to 1998 This paper presents fault analysis on Circuit Breakers, Disconnecting Switch, Gas Insulated Switchgear, etc. Thus, this paper will help improve design, manufacture, construction technology and maintenance method.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.465-468
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• 1995

The gas-insulated switchgear(GIS) has made high-reliability, high-safety, compact substations possible by using $SF_6$ gas. They are likely to be further developed toward higher voltages and targer capacities, along with greater compactness and lower cost. Although $SF_6$ gas has excellent insulation performance, breakdown voltages are reduced by the conducting particles. Thus, extensive studies have been made on the breakdown characteristics of $SF_6$ gas in particle contaminated conditions. Experiments were carried out for fired particle and free particle in a coaxial electrode system with DC and AC voltages. This paper represents the experimental results of the processes involved in electrical breakdown in compressed $SF_6$ gas, where breakdown is initiated by conducting particles.

• Proceedings of the KIEE Conference
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• 2007.11a
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• pp.194-195
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• 2007

$SF_6$ gas used widely as insulating component in electric power industry has excellent in insulation and arc extinguishing performance in gas-insulated switchgear. However, the concern about eco-friendly alternative gas is currently rising because $SF_6$ gas is one of the main greenhouse gases. In this paper, dry-air and composite-insulation (dry-air+epoxy) as the alternative technology for $SF_6$ gas insulation is studied. Under the gas pressure ranged from 0.1 to 0.6MPa, the breakdown voltage of dry-air were measured in AC electric field. The data of composite-insulation were acquired by changing the thickness of epoxy used in each composite-insulation under the same condition.