• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
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• pp.99-100
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• 2008

Composite insulators are rapidly replacing their porcelain counterparts in electrical substation applications. The composite insulator provide technical and safety ad vantages over other types of insulator. These insulators consist of a FRP(Fiber-reinforced polymer), with two metal flanges and silicone rubber. In this paper, we have investigated the influence of electric field different shaped silicone shed under $SF_6$ gas. As a result, shape of silicone rubber does not effected a electric field. However, the shape of shed can be decided the creepage distance.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.495-498
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• 2002

This paper describes the results the problem of stress calculation and optimization into a FRP(Fiber-glass Reinforced Plastic) tube crimped into a metal end-fitting. This type of assembly is used mainly is used mainly for suspension and line post insulators. Fitting strength of FRP and flange of this study is required greatly from composite insulator to important special quality. Therefore, wish to seek analysis and mechanical strength performance that follow to FRP tube and flange of top and bottom mechanical fitting.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 추계학술대회 논문집
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• pp.225-226
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• 2008

• 대한전기학회:학술대회논문집
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• 대한전기학회 1990년도 하계학술대회 논문집
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• pp.269-272
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• 1990

This paper introduces a technique of shifting the resonant frequency and of depressing the spurious modes in the composite piezoelectric vibrator laminated in the order of piezoelectric vibrator/thin insulator/piezoelectric vibrator, whose vibrators have the the same sizes and the same properties, respectively. The composite vibrator has shown the characteristics that the fundermental resonant frequency has decreased and spurious modes have depressed with increase of the capacitance of the inserted insulator. And the frequency characteristics of the composite vibrator without insulator have been nearly the same as those of each vibrator.

• Elastomers and Composites
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• 제34권5호
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• pp.407-413
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• 1999

비세라믹 복합절연소재는 기계적 물성, 환경문제, 대량생산과 용이한 설계등의 우수한 특성으로 인해 전력산업분야에서 관심의 대상이 되어왔다. 또한 세라믹 절연체에 비하여 가볍고, 더욱 강인한 물성을 가진다는 장점이 있다. 본 연구에서는 뛰어난 전기 절연 특성과 우수한 내열, 내산화, 내오존성과 내후성을 가진 ethylene propylene diene monomer(EPDM)를 절연소재로 사용하였다. 특히, EPDM은 다른 고무 복합체에 비해 우수한 소수성을 가지기 때문에 장기간 사용이 가능하다는 점에서 본 연구에서는 EPDM 복합체의 유변학적 물성, 전기적물성, 그리고 접촉각의 측정을 통한 소수성 및 회복력에 관한 연구를 하였다. 또한 SEM을 사용하여 표면 형태학적 연구를 수행하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 C
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• pp.1449-1451
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• 2002

A developed 800kV class composite hollow insulator for $SF_6$ Gas Insulated Switchgear (GIS) was tested as to insulation with their surfaces contaminated. The wet power frequency withstand voltage of the silicone rubber housing was about 135kV at an equivalent salt deposite density of $5kg/m^2$, to sufficiently satisfy the required performance. According to IEC 60507, the salt fog withstand voltage was measured at 565kV, and the highest measured leakage current was below 0.2mA. Therefore, it was clarified that the composite hollow insulator has sufficient insulation performance even when it is contaminated on the surface.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.306-310
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• 1996

In this paper a series of developing process for an insulator which can be employed in overhead distribution lines, using polymeric composite materials, is introduced. In order to design an insulator for heavily polluted area, weathershed of alternating type was adopted, which could have longer leakage distance. Modified EVA was used as surface material which has good electrical and mechanical characteristics as well as superior chemical stability. FRP core was covered with above surface material through heat shrinking process. By standardization of each process, higher productivity and lower production cost could be ensured. The developed insulator has been put under various tests including long-term field test and artificial aging test and satisfactory results were obtained.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1301-1305
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• 2005

The performance of OTFT with $PVP-TiO_2$ composite, as a gate insulator, is reported, including the effect of surfactant for synthesizing the composite material. According to our investigation results, it was one of critical issues to prevent the aggregation of $PVP-TiO_2$ particles during the synthesis process. From this point of view, $PVP-TiO_2$ particles were treated using Tween80, as a surfactant, and we could reduce the aggregated $PVP-TiO_2$ clusters. As a result, the OTFT with the composite insulator showed the threshold voltage of about -8.3 V and the subthreshold slope of about 1.5 V/decade, which are the optimized properties compared to those of OTFTs with bare PVP, in this study. It is thought that these characteristic improvements are originated from the increase in the dielectric constant of the PVP-based insulator by compositing with high-k particles.

• 한국추진공학회지
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• 제10권4호
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• pp.47-53
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• 2006

본 논문에서는 탄소-페놀 복합재로 제조된 로켓 노즐 내열부품의 고온에서의 거동을 3차원 축대칭 유한요소 모델을 사용하여 해석하였다. 실제 작동 조건을 사용하여 카울 영역의 적층링을 해석한 결과 층각도, 축방향 치수, 경계조건은 적층링 내부의 응력 분포에 큰 영향을 주는 것으로 확인되었다. 특히 링과 링 사이의 접합부분에서 모서리 탈락 현상의 전조 현상인 층간분리가 발생한다. 분리현상 이후에는 층각도 방향 전단응력과 축방향 압축응력에 의해 탈락 현상이 발생하는 것으로 판단된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1490-1492
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• 2001

Recently polymer composite materials has been replacing the porcelain in suspension insulators as a insulating material. The polymer composite materials are introduced into Korea from the abroad, so there is, actually, no formal standard of assessment Both the porcelain insulator specifications and composite material test specifications are being used at the same time. The aim of this project is to establish a systematic standard suitable to current situations considering the trends of its production within Korea. This would protect the inner-markets against the market-opening and would promote the industrial development within a country.