• Title/Summary/Keyword: Electrical insulation coating

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A Study on Dielectric Strength and Insulation Property of High Voltage Switchgear Applied Dry Air Gas (Dry Air Gas를 적용한 초고압 Switchgear 절연특성연구)

  • Jeong, D.H.;Chung, Y.H.;Seo, K.B.;Kim, T.H.;Kim, J.B.;Lee, H.S.
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.10
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    • pp.1731-1737
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    • 2008
  • This paper present the fundamental insulation characteristics of Dry Air gas and insulation coating in high voltage power apparatus. It is known that the dielectric strength. of Dry Air is approximately one-third that of SF6 gas. we attempt that the insulation coating and dry air gas have replaced the SF6 gas as insulation of the switchgear. We proposed the dry air insulated switchgear(DAIS) for High Voltage apparatus. To acquire technology of insulation characteristic improvement made standards for complex insulation structure and conducted simulations and experiments

Influence of Tank Inner Side Dielectric Coating on the Particle Behaviour and Flashover Voltage in SF\ulcorner Gas Insulated System

  • Lee, Bang-Wook;Koo, Ja-Yoon
    • Journal of Electrical Engineering and information Science
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    • v.2 no.3
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    • pp.77-81
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    • 1997
  • In his work, the influence of wire type conducting particles on the insulation reliability of GIS has been systematically investigated when the epoxy resin based dielectric coating was made on he inner side of outer electrode. For this purpose, coaxial cylinder-type electrode was adopted in 362 kV chamber and various sizes of Cu conducting particle were used under different gas pressures. In order to elucidate the coating effect on the gas insulation, different thickness of dielectric coating has been considered and then the lift-off voltage and flashover voltages have been measured. The results shown that the dielectric coating has a remarkable influence by restraining the movement of particle in GIS system, and thus GIS insulation reliability is noticeably improved.

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NiZn Ferrite Coating for Electrical Insulation of MnZn Ferrite Cores

  • Kitamoto, Y.;Yajima, H.;Nakayama, Y.;Abe, M.
    • Journal of the Korean Ceramic Society
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    • v.38 no.6
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    • pp.506-508
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    • 2001
  • The ferrite plating with applying power ultrasound waves of 19.5 kHz and 600W enabled us to encapsulate entirely MnZn ferrite cores for transformers with Ni$\sub$x/Zn$\sub$y/Fe$\sub$3-x-y/O$_4$coating. Supplying a NH$_4$OH solution during the plating broke the limit of the solubility of Ni ions to ferrite-plated films. The electrical resistivity of the NiZn ferrite coating increased with increasing the Ni and Zn content, reaching 2.3${\times}$10$\^$5/Ωcm at the composition of Ni$\sub$0.24/Zn$\sub$0.30/Fe$\sub$2.46/O$_4$. The saturation magnetization was 540 emu/㎤. As a result, the MnZn ferrite cores were successfully encapsulated with the NiZn ferrite coatings for an insulation layer.

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A Study on the Surface Properties of Polymer Insulators for Improving Electrical Insulation Performance (전기 절연성능 향상을 위한 폴리머 애자의 표면 특성 연구)

  • Park, Yong Seob;Bae, Jae Sung;Hong, Byungyou;Lee, Jae Hyeong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.34 no.1
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    • pp.63-67
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    • 2021
  • In this paper, we investigated the surface properties of polymer insulators to improve electrical insulation performance. First, after washing the polymer insulator in various ways, its contact angle was increased, thereby improving the hydrophobic properties and electrical insulation properties. In addition, TiO2 thin films, which have been used as a photocatalytic material and have been applied to the polymer insulator surface of to enhance the surface and electrical insulating properties. For the sputtering method, the contact angle after coating the TiO2 thin film increased with increasing RF power, but it was lower compared to that before coating, indicating that the hydrophobic properties of the surface were slightly deteriorated. Consequently, the electrical properties of the polymer-insulating material were maintained or improved after the TiO2 thin-film coating.

Effect of the Inner Side Dielectric Coating of the Tank on the Particle Movement for Improving of GIS Insulation Reliability (GIS 절연 신뢰성 향상을 위한 탱크 내면 코팅이 파티클 거동에 미치는 영향)

  • Lee, Bang-Wook;Koo, Ja-Yoon;Kim, Min-Kyu;Kim, Ik-Soo
    • Proceedings of the KIEE Conference
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    • 1996.11a
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    • pp.267-269
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    • 1996
  • In this work, the influence of wire type conducting particles on the insulation reliability of GIS has been systematically investigated when outer electrode was dielectric coated by epoxy resin. For this purpose, coaxial cylinder-type electrode was adopted in 362 kV chamber and various size of Cu conducting particle was used and different gas pressure was applied. To prove the coating effect on the gas insulation, different thickness of epoxy coated outer electrode have been considered and the lift-off voltage and flashover voltage have been analyzed. The results show that the dielectric coated electrode has an remarkable influence on the reducing particle behavior in GIS system and enhancing the GIS insulation reliability.

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Thermal Properties of Insulation Coating Resin by Nanohybrid Method (나노하이브리드 절연코팅 수지의 내열특성)

  • Han, Se-Won;Kang, Dong-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.275-275
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    • 2010
  • 나노하이브리드 방법으로 제조된 변성 폴리이드계 나노하이브리드 절연코팅의 표면 내열특성을 비교 분석하였다. 최근 절연코팅의 사용환경이 열적내구성을 높게 요구하는 경향이 크다. 따라서 이러한 환경에 맞는 절연성과 열적내구성을 구현하기 위해서는 열적내구성이 우수한 세라믹 일자를 수지에 분산시켜 그 성능을 개선할 필요가 있다. 본 논문에서는 나노 하이브리드 방법으로 제조된 변성 폴리이드계 나노하이브리드 절연코팅의 표면 내열특성을 비교 분석하였다.

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Insulation Life Estimation for Magnet Wire Under Inverter Surge and Temperature Stress (인버터 서지와 온도 스트레스 하에서 Magnet Wire 절연 수명평가)

  • Park, Jae-Jun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.10
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    • pp.641-646
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    • 2016
  • Coil specimen was prepared by coating a copper wire with two varnish thin layers: the first was polyamideimide (PAI)/nanosilica (5 wt%) varnish and the second was anti-corona PAI/nanosilica (15 wt%) varnish. Insulation breakdown voltage was investigated under inverter surge condition at $20^{\circ}C$, $70^{\circ}C$, $100^{\circ}C$, $150^{\circ}C$, $200^{\circ}C$, $250^{\circ}C$, respectively. The insulation lifetime of the two layered coil was tens of times longer than that of original PAI coil. And the insulation lifetime decreased with increasing ambient temperature because there was weak binding strength between copper and varnish layer.

Electrical Properties about Thermal and Water Degradation of Epoxy Powder for Bus Duct (부스닥트용 에폭시 분체도료의 열 및 수중열화에 대한 전기적 특성)

  • Kim, Hyun-Hee;Kim, Sang-Hyun
    • Fire Science and Engineering
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    • v.23 no.3
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    • pp.17-22
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    • 2009
  • Epoxy powder is being in use for insulation materials widely. Especially, in cause of coating insulation can be caused electrical fire and explosion by Joul's heat. This study has been compared and examined around breakdown, arc discharge, and V-t about insulation of Epoxy powder. Also, it has been researched about insulation which is cause of electrical fire and its basic data. According to temperature change, sample KS was stable before the Tg to be about $8{\sim}10%$ decrease in the breakdown test. In case of V-t and arc discharge, it had been kept up suitable characteristic. Also, in case of electrical characteristic, sample KS has excellent capacity.

Insulation Breakdown Frequency Properties of PAI Enamelled Rectangular Coils According to Thermal Deterioration Temperature Variation (열적 열화 온도 변화에 따른 PAI 에나멜 각형코일의 절연 파괴 주파수 특성)

  • Park, Jae-Jun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.12
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    • pp.829-834
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    • 2016
  • Coil specimens were prepared by continuous coating on a copper wire with flexible PAI (polyamideimide) and PAI/nanosilica (5 wt%) varnish and thermally aged at 150, 200 and $250^{\circ}C$ for 5, 10 and 15 days, respectively. AC insulation breakdown voltage was investigated under inverter surge condition at 60 Hz and 1,000 Hz and insulation breakdown voltage decreased with increasing aging temperature and aging time at each 60 and 1,000 Hz.

Insulation Breakdown Properties of AC and DC according to Curvature Variation of PAI Organic/Inorganic Hybrid Coils (PAI 유/무기 하이브리드코일의 곡률변화에 따른 AC 및 DC 절연파괴 특성)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.10
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    • pp.1721-1726
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    • 2016
  • 4-types of coils were prepared by coating with polyamideimide (PAI) organic/inorganic hybrid. One type was made with original PAI vanish and the other 3-types were made of double layers, that was to say, high flexural PAI layer and high anti-corona PAI/nanosilica (15 wt%) layer. Drying temperature (T/D) were $220^{\circ}C$, $240^{\circ}C$, and $260^{\circ}C$, respectively and rectangular type coil for high-voltage rotating machine was used. DC and AC electrical breakdown tests were carried out in order to study the insulation properties according to T/D temperature and coil curvature (5, 15, and $25mm{\Phi}$). As the curvature increased, electrical breakdown voltage decreased and as T/D temperature decreased, electrical breakdown voltage increased.