• Proceedings of the KIEE Conference
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• 2002.07c
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• pp.1440-1442
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• 2002

폴리머 애자는 여러 가지의 외부환경에 의하여 시간의 경과에 따라서 재료의 열화가 진행된다. 폴리머 애자를 평가하는 방법으로 기계적 특성, 전기적 특성, 환경적 특성 등의 평가방법이 있으나 각각의 특성평가에 있어서 국제, 국가 및 단체에 따라서 서로 다르다. 신뢰성 평가기준도 서로 달라 국내 실정에 맞는 폴리머 애자의 신뢰성 향상에 어려움이 있었다. 이러한 문제를 해결하기 위하여 폴리머 애자의 신뢰성 평가기준을 표준화할 필요성이 있다. 본 원고에서는 특고압 가공배전선로에 사용하는 폴리머 현수애자의 신뢰성 평가기준에 대하여 설명하였다. 장기신뢰성 평가를 위하여 다양한 외부환경을 모의하여 복합적인 스트레스를 가할 수 있는 복합가속열화설비에 대하여 설명하고 복합가속열화시험법을 결정하였다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2019-2020
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• 2008

옥외에서 폴리머 애자의 사용량이 급격하게 증가하는 이유는 자기제 애자에 비해 경량이면서 오손특성이 우수하다는 장점 때문이다. 약 10년 전 국내 배전선로에 설치된 EPDM(Ethylene propylene diene monomer) 재질의 폴리머 현수애자의 섬락고장이 있었다. 폴리머 애자는 재질 특성상 사용시간에 따라 표면 열화가 진행되고, 표면의 절연저항이 감소하여 누설전류가 증가하게 된다. 표면 섬락고장을 유발하는 누설전류는 절연물 표면 상태에 많은 영향을 받는다. 본 연구에서는 폴리머애자 표면에 부착된 오손물이 전기적 특성에 미치는 영향을 분석하였다. 표면에 부착된 미세한 오손물은 발수성을 급격히 저하시켰으며, 장시간 수분에 노출될 경우 상용전압에서 표면 방전의 원인이 되었다. 결과적으로 부착된 오손물은 누설전류와 절연내력에 영향을 주어 절연 특성을 저하시키게 된다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.05c
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• pp.66-68
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• 2001

Recently polymer insulators are being used for outdoor high voltage applications. Polymer insulators for transmission and distribution line have significant advantages over porcelain and glass insulators, especially for ultra-high voltage(UHV) transmission lines. Their advantages are light weight, vandalism resistance and hydrophobicity. In this paper, distribution polymer suspension insulator has been designed and investigated electric field distribution by FEM.

• KEPCO Journal on Electric Power and Energy
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• v.2 no.4
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• pp.509-515
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• 2016

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.612-614
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• 2005

국내 배전계통에 90년대 중반이후 초기에 도입된 외국산 및 국산 폴리머애자를 현장에서 발취하여 특성을 평가하였다. 외관 관찰, 하우징의 발수성 및 경도, 전기적 특성, 하우징 재질의 변화특성 둥을 시험 평가하였다. 평가 결과 하우징은 발수성이 상실되었으며 표면에 열화가 진행되었다. 그러나 애자의 성능은 양호한 것으로 나타났다.

• Proceedings of the KIEE Conference
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• 2001.07c
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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.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.50 no.7
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• pp.340-345
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• 2001

Because they have superior insulating properties and lower in price than their ceramic equivalents, polymeric insulators have been used in outdoor insulators. But polymeric insulators mainly using in an heavy contamination area of outdoor could be easily attached to contaminants such as salt and by-products of industrial processes. To understand its effect on contaminants adhered to these insulators, we dismounted polymeric insulators adhered contaminant in the field, and evaluated its electrical characteristics, CA, and ESDD. We also manufactured slurry mixed by some kaolin and salt for the artificial contamination test and measured the degree of contaminant, AC leakage current for these contaminated samples. Consequently, the adhered contaminants to its surface is likely to be affected the performance of insulation.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.05c
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• pp.59-61
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• 2001

Polymeric suspended insulators for the electric track line have been developed. The main elements to design polymeric insulators are the insulation ability related with materials of FRP core and housing, and the optimal structure related with fitting parts and interface characteristics. To confirm the design fitness of insulator samples the electric field distribution by FEM and mechanical stress distribution by NASTRAN program was analysed with housing shed shapes and fitting structure. The leakage distance and breakage voltage properties which are core parameters to determine electric insulation ability are selected according to the requirement values of user specification, then the power frequency wet withstand voltage was specified above 22kV and the leakage distance was required above 290mm. The contamination condition of the electric track line was the heavy class according to IEC 815 in order to retain the enough safety margin against overvoltages.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.558-559
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• 2005

Recently, polymer insulators that are used for high voltage applications have some advantages such as light weight, small size, vandalism resistance, hydrophobicity and easy making process. During outdoor service of polymer insulators, the surface of the insulating material is frequently subjected to moisture and contamination that lead to dry band arcing. Their tracking resistance, erosion resistance, end sealing and shed design are very important because dry band arcing causes degradation of polymer surface. In this paper, the tracking property of polymer suspension insulator for power transmission is investigated with CEA tracking wheel test. The diagnosis of insulator sample in tracking test has been analyzed by leakage current, STRI Guide, SEM, FTIR and thermal image.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05e
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• pp.6-10
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• 2003

In our country, the housing materials of polymeric outdoor insulators have mainly been used EPDM or silicone rubber. EPDM housing materials had been widely used in the field for the first time. The reason why silicone has the high cost of production. But recently, most of the manufacturers that newly developed polymeric insulators make its choice of silicone housing. EPDM showed a good resistance to tracking. We compared the various characteristics for EPDM and silicone insulators that have similar type and design. Silicone insulators have more performance in flashover voltage test and leakage current measurement because of a good water repellent than EPDM ones. Also, the property of EPDM compared with silicone insulators greatly decreased after aging test in combined acceleration ageing facilities for 1000 hours.