• Title/Summary/Keyword: DC dielectric breakdown

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The variation of water absorption rate and DC dielectric breakdown strength of Epoxy composites due to filler content (충진재 함량 변화에 따른 에폭시 복합재료의 흡수율과 직류 절연파괴강도의 변화)

  • Lee, D.J.;Kim, T.Y.;Shin, S.K.;Kim, M.H.;Kim, K.H.;Kim, J.H.
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2349-2351
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    • 1999
  • In this paper, the variable absorption rates and DC dielectric breakdown strength of epoxy composites were measured at boiling absorption condition in order to observe the influences of moisture in out door use. Also, in order to improve withstand voltage properties at moisture absorbtion condition. IPN (interpenetrating polymer network) method which had been already reported, was introduced and the influence was investigated. As a result, it was confirmed that the moisture absorption rate was increased and DC dielectric breakdown strength was degraded with boiling time and filler content increasing. On the other hand, it was confirmed that moisture absorption rate and DC dielectric breakdown strength degrading rate were lowered by the improvement of adhesion strength In IPN specimens.

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An Analysis of Insulating Reliability in Polyethylene for High Frequency Molding Materials (고주파 성형 재료용 폴리에칠렌의 절연 신뢰도 분석)

  • Park, Geon-Ho;Kim, Ki-Joon;Wang, Jong-Bae;Shin, Chul-Ki;Kim, Jin-Sa;Lee, Joon-Ung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.10a
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    • pp.64-67
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    • 2000
  • In this study, the DC dielectric breakdown of polyethylene used for clothing material of cable was experimented and then its data were simulated by Weibull distribution probability. The dielectric breakdown characteristics in polyethylene were examined and various effects of the DC dielectric breakdown on polyethylene were also discussed.

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Evaluation of Insulating Reliability in Epoxy Composites using Dielectric Breakdown Data (절연 파괴 데이터를 이용한 에폭시 복합체의 절연 신뢰도 평가)

  • Park, Geon-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.05b
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    • pp.114-118
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    • 2005
  • In this study, the DC dielectric breakdown of epoxy composites used for molding material was experimented and then its data were simulated by Weibull distribution equation. From the analysis of Weibull distribution, it was confirmed that as the allowed breakdown probability was given by 0.1[%], the applied field value needed to be under 21.5[kV/mm].

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Insulating Reliability according to additives in Epoxy Composites for PCB Material (인쇄 회로 기판용 에폭시 복합체의 첨가제에 따른 절연 신뢰도)

  • Yang, Jeong-Yun;Park, Young-Chull;Park, Geon-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.05b
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    • pp.159-163
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    • 2003
  • In this study, the DC dielectric breakdown of epoxy composites used for PCB material was experimented and then its data were simulated by Weibull distribution equation. The more hardener increased the stronger breakdown strength at low temperature because of cross-linked density by the virtue of ester radical, and the breakdown strength of specimens with filler was lower than it of non-filler specimens because it is believed that the adding filler forms interface and charge is accumulated in it, therefore the molecular motility is raised, the electric field is concentrated, and the acceleration of electron and the growth of electron avalanche are early accomplished. From the analysis of Weibull distribution, it was confirmed that as the allowed breakdown probability was given by 0.1[%], the applied field value needed to be under 21.5[kV/mm].

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DC Dielectric Breakdown Properties of Epoxy Composites with Variation of Additives and Curing Conditions (첨가제 및 경화조건 변화에 따른 에폭시 복합체의 DC 절연파괴특성에 관한 연구)

  • Chug, Kyu-Hee;CHoi, Woon-Shik;Wang, Jong-Bae;Kim, Hong-Chul;Lee, Joon-Ung
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.883-885
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    • 1992
  • DC dielectric breakdown properties of epoxy composites with various additives rates and curing conditions were investigated at the temperature range from 20[$^{\circ}C$] to 180[$^{\circ}C$]. At low temperature an improvement of the characteristics is observed due to curing agents. The additions of filter is lower the temperature dependences of the breakdown strength. Samples treated with silan have a higher breakdown strength than non-treating filled samples.

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A study on the dielectric breakdown properties of two and three interpenetrating polymer network epoxy composites (2,3 성분 상호침입망목 에폭시 복합재료의 절연 파괴 특성에 관한 연구)

  • 김명호;김경환;손인환;이덕진;장경욱;김재환
    • Electrical & Electronic Materials
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    • v.9 no.4
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    • pp.364-371
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    • 1996
  • In this study, in order to investigate the applicability of IPN structure to epoxy resin which has been widely used as electrical and electronic insulating materials, DC dielectric breakdown properties and morphology were compared and analyzed according to variation of network structure, using the single network structure specimen formed of epoxy resin alone, interpenetrating polymer network specimen formed of epoxy resin/methacrylic acid resin, and interpenetrating polymer network specimen formed of epoxy resin/methacrylic acid resin/polyurethane resin. As results of the measunnent of DC dielectric breakdown strength at 50[.deg. C] and 130[>$^{\circ}C$], IPN specimen formed of epoxn, resin 100[phr] and methacrylic acid resin 35[phr] was the most excellent, and which corresponded to the SEM phenomena. The effect of IPN was more remarkable at high temperature region than at low temperature region. It is supposed that the defect of epoxy resin, dielectric breakdown strength is lowered remarkably at high temperature region, be complemented according to introducing IPN method.

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Breakdown Characteristics of LLDPE/EVA mixture film under DC field (직류 전계하 LLDPE/EVA혼합필름의 절연파괴특성)

  • 고시현;김형주;이종필;신현택;이충호;홍진웅
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2000.11a
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    • pp.65-68
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    • 2000
  • Polyethylene, has long history and is widely used, was researched due to good electrical properties by many authors. But PE under stress has the critical defects of space charge accumulation and tree growth, so various methods such as catalyst, additives and blend to improve these problems have been execute, of which we selected blending method. As in our previous papers we investigated electrical conduction, dielectric and AC dielectric breakdown characteristics, we did DC dielectric breakdown characteristics in this paper. We selected pure LLDPE, pure EVA and LLDPE films mixed with EVA as specimens, which were mixed with the weight percentages of 50, 60, 70 and 80[wt%] to be thin film. DC applying voltage speed was 500[V/sec]. The relation between dielectric breakdown characteristics and the variations of super structure due to mixing was investigated, and especially trap level at amorphous region, threshold energy increment of conductive electron at free volume were considered.

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A Study on the DC Dielectric Breakdown Properties of Epoxy Composites Containing Methacrylate/Polyurethane (Methacrylate/Polyurethane이 함유된 Epoxy 복합재료의 직류 절연 파괴 특성에 관한 연구)

  • Kim, M.H.;Kim, K.H.;Lee, D.J.;Ga, C.H.;Shin, S.K.;Kim, J.H.
    • Proceedings of the KIEE Conference
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    • 1994.07b
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    • pp.1357-1359
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    • 1994
  • In this study, in order to improve the problem that dielectric breakdown strength decrease remarkably at high temperature, simultaneous interpenetrating polymer networks method was Introduced so that epoxy insulating material could have stable temperature characteristics and stable dielectric breakdown characteristics at whole temperature range. So network structure of epoxy/$SiO_2$ composite material was changed by adding MA and MA/PU into epoxy resin. DC voltage is applied into the specimen fabricated by this method, and then the result was compared and investigated.

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직류 전계하 LLDPE/EVA혼합필름의 절연파괴특성

  • 고시현;김형주;이종필;신현택;이충호;홍진웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.65-68
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    • 2000
  • Polyethylene, has long history and is widely used, was researched due to good electrical properties by many authors. But PE under stress has the critical defects of space charge accumulation and tree growth, so various methods such as catalyst, additives and blend to improve these problems have been execute, of which we selected blending method. As in our previous papers we investigated electrical conduction, dielectric and AC dielectric breakdown characteristics, we did DC dielectric breakdown characteristics in this paper. We selected pure LLDPE, pure EVA and LLDPE films mixed with EVA as specimens, which were mixed with the weight percentages of 50, 60, 70 and 80[wt%] to be thin film. DC applying voltage speed was 500[V/sec]. The relation between dielectric breakdown characteristics and the variations of super structure due to mixing was investigated, and especially trap level at amorphous region, threshold energy increment of conductive electron at free volume were considered.

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Evaluation of Insulating Reliability in Epoxy Composites by DC Dielectric Breakdown Properties (DC 절연파괴 특성을 이용한 Epoxy 복합체의 절연 신뢰도 평가)

  • 임중관;박용필;김정호
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.92-95
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    • 2001
  • The dielectric breakdown of epoxy composites used for transformers was experimented and then its data were simulated by Weibull distribution probability. First of all, speaking of dielectric breakdown properties, the more hardener increased the stronger breakdown strength at low temperature because of cross-linked density by the virtue of ester radical. The breakdown strength of specimens with filler was lower than it of non-filler specimens because it is believed that the adding filler forms interface and charge is accumulated in it, therefore the molecular motility is raised and the electric field is concentrated. In the case of filled specimens with treating silane, the breakdown strength become much higher Finally, from the analysis of weibull distribution, it was confirmed that as the allowed breakdown probability was given by 0.1[%], the applied field value needed to be under 21.5 [Mv/cm].

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