• Title/Summary/Keyword: Dielectric breakdown

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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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The AC, DC Dielectric Breakdown Characteristics according to Dielectric Thickness and Inner Electrode Pattern of High Voltage Multilayer Ceramic Capacitor (고압 적층 칩 캐패시터의 유전체 두께 및 내부전극 형상에 따른 AC, DC 절연 파괴 특성)

  • Yoon, Jung-Rag;Kim, Min-Kee;Lee, Seog-Won
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.12
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    • pp.1118-1123
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    • 2008
  • High voltage multilayer ceramic capacitors (MLCCs) are classified into two classes-those for temperature compensation (class I) and high dielectric constant materials (class II). We manufactured high voltage MLCC with temperature coefficient characteristics of C0G and X7R and studied the characteristics of electric properties. Also we studied the characteristics of dielectric breakdown voltage (V) as the variation of thickness in the green sheet and how to pattern the internal electrodes. The dielectric breakdown by electric field was caused by defects in the dielectric materials and dielectric/electrode interface, so the dielectric thickness increased, the withstanding voltage per unit (E) thickness decreased. To overcome this problem, we selected the special design like as floating electrode and this design affected the increasing breakdown voltage(V) and realized the constant withstanding voltage per unit thickness(E). From these results, high voltage application of MLCCs can be expanded and the rated voltage can also be develop.

Electrical Treeing Deterioration and Dielectric Breakdown Phenomena in Polymeric Insulator (고분자 절연재료에서 전기트리 열화 및 절연파괴 현상)

  • Cho, Yeong-Sin;Kim, Sang-Uk
    • Korean Journal of Materials Research
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    • v.9 no.4
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    • pp.398-403
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    • 1999
  • Studies on the electrical treeing deterioration and dielectric breakdown phenomena in the polymeric insulator of polyethylene and epoxy resin were carried out. Block type samples with needle-plane electrode geometry were electrically stressed and the tree pattern from the needle tip was observed. In LDPE the density of electrical tree was very high and its pattern was bush type. For the case of XLPE, branched tree was observed. As temperature and SN content increased, the dielectric breakdown voltage decreased and the treeing phenomena became more complicated. Fan type cracks were observed around the conducting tree path in the brittle DGEBA/MDA system.

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Dielectric Breakdown Characteristics Depending on The Nano Filler of Epoxy Nano-composites (나노 충진제에 따른 에폭시 나노 컴퍼지트의 절연파괴강도 특성)

  • Park, Tae-Hak;Back, Sung-Hak;Lee, Dong-Gun;Park, Hong-Kyu;Jeong, In-Bum;Hong, Jin-Woong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.92-92
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    • 2010
  • In this paper, the test is performed on MgO, which is used as a filler in epoxy additives, respectively (0, 1.0, 3.0, 5.0, 7.0, 10 [wt%]) for HVDC(high voltage direct current) submarine cable insulating material to improve electrical properties of epoxy resin in high temperature. The breakdown strength due to increasing amount of filler increased to 5.0 [wt%] by the effects of the Coulomb blockade. However, it is confirmed that strength of dielectric breakdown decreased because the filler functioned as impurities and affected the breakdown when filler additive exceeded by 5.0 [wt%] or more. We have found that the highest dielectric breakdown strength of specimen added 5.0 wt% at $25^{\circ}C$, and is more increased approximately 13.7 [%] than virgin specimen.

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The Characteristics of Dielectric Breakdown for Epoxy Resin irradiated Electron Beam (전자선 조사된 에폭시 수지의 절연파괴 특성)

  • Hong, Nung-Pyo;Cho, Dong-Chan;Park, Heung-Kyu;So, Byung-Mun;Kim, Wang-Kon;Hong, Jin-Woong
    • Proceedings of the KIEE Conference
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    • pp.430-432
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    • 1995
  • In this paper, the electron beam with 1[Mrad], 2[Mrad], 4[Mrad], 8[Mrad] and 24[Mrad] is irradiated for specimen experiments on physical properties which is investigated by FTIR, and dielectric breakdown among the electrical characteristics of specimen are carried out. For the dielectric breakdown experiment, external 60 [Hz] AC voltage is applied to specimen with the rising voltage of 3[kV/cm] until dielectric breakdown occured. We made a breakdown experiment under the temperature condition of 50[$^{\circ}C$], 100[$^{\circ}C$], 150[$^{\circ}C$] in the silicone oils of dynamic viscosity of 100[cSt].

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Experimental Study on the Dielectric Breakdown and Fire Risk Assessment of Electric Parts Exposed to Various Beverages (기호음료에 노출된 전기부품의 절연파괴 및 화재 위험성에 관한 연구)

  • Oh, Taek-Hyun;Kim, Eung-Sik
    • Fire Science and Engineering
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    • v.33 no.1
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    • pp.15-22
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    • 2019
  • Refrigerator and heating cabinet fires due to the dielectric breakdown of electronic components caused by leaked beverages are being reported frequently. On the other hand, there has been little interest in measuring the electrical characteristics of beverages and studying the cause of fires. In this paper, the electrical conductivity and total dissolved solids (TDS) for 32 different beverages commonly sold in South Korea were measured to study the relationship between the electrical conductivity and dielectric breakdown. Out of these 32 beverages, based on the measurements, some characteristic beverages were selected and further dielectric breakdown tests were conducted. The results showed that the probability of a fire is higher for beverages with high electrical conductivity. Interestingly, beverages with low electrical conductivity had a high likelihood of fire depending on the type of beverage. Moreover, some conditions that cause spark ignition, which lead to fires in electronic components, were identified.

Electric Properties of Silicone Rubber on Reinforcing Agent Dependence (보강제 변화에 따른 실리콘 고무의 전기 특성)

  • 이성일
    • Journal of the Korea Safety Management & Science
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    • v.6 no.1
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    • pp.301-309
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    • 2004
  • An inorganic filling agent, ATH (alumina trihydrate) was used to induce inorganic-organic coupling by mixing with stearic acid, acryl silane, vinyl silane as surface treatment agents in order to apply as a high voltage insulating material. Volumetric resistivity was shown to vary with surface treatment agents, and the highest value was obtained in case of the mixture with vinyl silane. The dielectric breakdown intensity was shown to decrease gradually and saturate to a stable value, possibly due to the increase of cross link density in the vinyl radicals introduced to silica surface, resulting in stable dielectric breakdown intensity in the final stages. Tracking and flame retardant properties were also shown to be the best among the samples investigated in this study.

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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    • 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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Design and Fabrication Process Effects on Electrical Properties in High Capacitance Multilayer Ceramic Capacitor (고용량 적층 세라믹 커패시터에서 설계 및 제조공정에 따른 전기적 특성 평가)

  • Yoon, Jung-Rag;Woo, Byong-Chul;Lee, Heun-Young;Lee, Serk-Won
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.2
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    • pp.118-123
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    • 2007
  • The purpose of this work was to investigate the design and fabrication process effects on electrical properties in high capacitance multilayer ceramic capacitor (MLCC) with nickel electrode. Dielectric breakdown voltage and insulation resistance value were decreased with increasing stack layer number, but dielectric constant and capacitance were increased. With increasing green sheet thickness, dielectric breakdown voltage, C-V and I-V properties were also increased. The major reasons of the effects were thought to be the defects generated extrinsically during fabrication process and interfacial reactions formed between nickel electrode and dielectric layer. These investigations clearly showed the influence of both green sheet thick ness and stack layer number on the electrical properties in fabricating the MLCC.

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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    • 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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