• Title/Summary/Keyword: Epoxy spacer

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Performance Evaluation on Epoxy Insulation Spacer for Extra High-voltage GIS (초고압 GIS용 절연스페이서의 성능평가)

  • Heo, J.C.;Jeong, J.Y.;Oh, C.S.;Yang, D.I.;Park, J.W.
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.2220-2222
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    • 2005
  • Epoxy Insualtion spacers for supporting the conductors and partitioning the sections in $SF_6$ Gas insulated Switchgear(GIS), require higher electrical, Thermal and mechanical reliability with other principal components in GIS to be operated without any failure in use. In this paper, we describe the results of the performance evaluation of electrical and mechanical properties for extra high-voltage GIS according to KEPCO spec. and the requirements of the insulators for GIS specified by IEC 62271-203(2004).

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Simulation for Injection Molding of Insulation Spacers for Gas-Insulated Switches Using Thermosetting Epoxy Resin (열경화성 에폭시를 이용한 가스 절연 개폐기용 절연 스페이서의 사출 성형 최적화 시뮬레이션)

  • Bae, Jaesung;Lee, Wonchang;Jee, Hongsub;Hong, Byungyou;Lee, Jaehyeong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.34 no.6
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    • pp.426-432
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    • 2021
  • Injection molding is used in many industrial fields such as home appliances, vehicle parts, and electronic device parts because various resins can be molded, leading to mass production of complex shapes. Generally, the empirical prediction method is used to set the initial processing conditions of injection molding. However, this approach requires a lot of cost and its presented solution is not accurate. In this paper, injection molding was simulated through the MoldflowTM in order to manufacture the spacer for gas insulated switch. Through the simulation, the flow of the resin with respect to the diameter of the inlet was analyzed. It was found that the process was possible at a higher resin temperature as the diameter of the inlet increased. In addition, through thermal analysis during injection of the resin, it was confirmed that a stagnation phenomenon occurred at the insert portion during injection molding, and the temperature of the resin was higher than that of the mold. As in this paper, if the spacer is manufactured by optimizing the injection hole and the temperature of the injection process based on simulation, it is expected that the spacer can be manufactured with high productivity.

Optimization of Curing Pressure for Automatic Pressure Gelation Molding Process of Ultra High Voltage Insulating Spacers (초고압 절연 스페이서의 자동가압 겔화 성형 공정을 위한 경화 보압의 최적화 )

  • Chanyong Lee;Hangoo Cho;Jaehyeong Lee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.37 no.1
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    • pp.56-62
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    • 2024
  • By introducing curing kinetics and chemo-rheology for the epoxy resin formulation for ultra-high voltage gas insulated switchgear (GIS) Insulating Spacers, a study was conducted to simulate the curing behavior, flow and warpage analysis for optimization of the molding process in automatic pressure gelation. The curing rate equation and chemo-rheology equation were set as fixed values for various factors and other physical property values, and the APG molding process conditions were entered into the Moldflow software to perform optimization numerical simulations of the three-phase insulating spacer. Changes in curing shrinkage according to pack pressure were observed under the optimized process conditions. As a result, it was confirmed that the residence time in the solid state was shortened due to the lowest curing reaction when the curing holding pressure was 3 bar, and the occurrence of deformation due to internal residual stress was minimized.

Synthesis and Properties of Liquid Crystal Compounds and Epoxy Resin Based Side Chain Liquid Crystal Polymers I. Low Molecular Weight Liquid Crystal Compounds (방향족 액정동족체 및 Epoxy형 측쇄 액정고분자의 합성 및 성질 I. 저분자 액정 동족체)

  • Park, Se Kwang;Ahn, Wonsool;Keum, Chang Dae;Park, Lee Soon
    • Applied Chemistry for Engineering
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    • v.9 no.1
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    • pp.66-70
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    • 1998
  • Several liquid crystalline monomers were synthesized and characterized to utilize as new matrix materials of liquid crystal/polymer composite films for display application. Liquid crystalline compounds which have azo group as center link, cyano group at one of the terminal position in common and bromoalkyl(azo(n)), azidoalkyl(AZI(n)), aminoalkyl(ALC(n)) as the terminal group were synthesized and identified respectively by FT-lR, $^1H-NMR$ spectrometer and elemental analysis. All these compounds exhibited nematic liquid crystalline region in the certain temperature range as determined by DSC and polarized optical microscope. These liquid crystalline compounds also showed a typical even-odd effect in both $T_{KN}$ and $T_{NI}$ due to conformational change as the length of terminal alkyl chain, $-(CH_2)n-$. was varied.

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A Study on a Radar Absorbing Structure for Aircraft Leading Edge Application

  • Baek, Sang Min;Lee, Won Jun;Joo, Young Sik
    • International Journal of Aeronautical and Space Sciences
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    • v.18 no.2
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    • pp.215-221
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    • 2017
  • An electromagnetic (EM) wave absorber reduces the possibility of radar detection by minimizing the radar cross section (RCS) of structures. In this study, a radar absorbing structure (RAS) was applied to the leading edge of a blended wing body aircraft to reduce RCS in X-band (8.2~12.4GHz) radar. The RAS was composed of a periodic pattern resistive sheet with conductive lossy material and glass-fiber/epoxy composite as a spacer. The applied RAS is a multifunctional composite structure which has both electromagnetic (EM) wave absorbing ability and load-bearing ability. A two dimensional unit absorber was designed first in a flat-plate shape, and then the fabricated leading edge structure incorporating the above RAS was investigated, using simulated and free-space measured reflection loss data from the flat-plate absorber. The leading edge was implemented on the aircraft, and its RCS was measured with respect to various azimuth angles in both polarizations (VV and HH). The RCS reduction effect of the RAS was evaluated in comparison with a leading edge of carbon fabric reinforced plastics (CFRP). The designed leading edge structure was examined through static structural analysis for various aircraft load cases to check structural integrity in terms of margin of safety. The mechanical and structural characteristics of CFRP, RAS and CFRP with RAM structures were also discussed in terms of their weight.

An Investigation on DC Electric Field Distribution according to the Material and Configureation of Epoxy Spacer for HVDC GIS (HVDC GIS용 에폭시 스페이서의 재질과 형상에 따른 전계분포 특성 연구)

  • Koo, Jae-Hong;Hwang, Jae-Sang;Kwon, Ik-Soo;Shin, Woo-Ju;Koo, Ja-Yoon;Lee, Bang-Wook
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1185-1186
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    • 2015
  • 본 논문에서 HVDC $SF_6$ 가스절연시스템(GIS)에서 최적의 에폭시 재질을 알아내기 위해 $Al_2O_3$$SiO_2$ 나노필러가 첨가된 총 다섯 종류의 에폭시에 대한 도전율을 측정하여 DC 전계분포 해석을 수행하였다. 해석결과 $75^{\circ}$의 접촉각(에폭시 스페이서와 도체가 이루는 각도)가 가장 우수한 전계특성을 나타냈고 $Al_2O_3$ 2 hundred per resin(phr)의 나노필러가 첨가된 에폭시가 가장 우수한 절연매질로써의 특성을 보여주었다. 또한, 삼중점에서 전계집중 완화를 위하여 $Al_2O_3$ 2 phr의 나노필러가 첨가된 에폭시의 데이터를 기반으로 열해석을 고려한 정상상태 및 극성 반전에 대해 DC 전계 해석을 수행하여 최적의 에폭시 스페이서 형상을 도출하였다.

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