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표면개질된 나노 알루미나의 에폭시-나노 콤포지트 유전 특성
박재준,Park, Jae-Jun 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.10
The aim of this study is to improve of dielectric properties using epoxy/nano alumina composites with adding glycerol diglycidyl ether (GDE:1,2 g). This paper deals with the effects of dielectric properties(${\epsilon}^{\prime}_r$ and $tan{\delta}$) for epoxy/nano alumina contents (1,3 phr) and GDE addition (1,2 g)composites. 5 kinds specimen were prepared with containing epoxy resins, epoxy nano alumina composites. Average particle size of nano used were 30 nm. The nano alumina used were gamma phase particles of spherical shape. The suppression of epoxy chain motion by addition of nano alumina+GDE decreased dielectric loss and relative permittivity magnitude.
가속된 열적 스트레스에 의한 PAI / Nano Silica 하이브리드 코일의 절연수명 추정
박재준(Jae-Jun Park) 대한전기학회 2019 전기학회논문지 Vol.68 No.1
In this paper, four types of insulation coils were fabricated by adding various kinds of glycols to improve the flexibility and adhesion of insulating coils in varnish dispersed with PAI / Nano Silica_15wt%. The applied voltage and frequency were 1.5 kV / 20 kHz for accelerated life evaluation. Through the 6th temperature stress level, the cause of the insulation breakdown of the coil was ignored and only the breakdown time was measured. The Arrhenius model was chosen based on the theoretical relationship between chemical reaction rate and temperature for estimating the insulation life of the coil due to accelerated thermal stress. Three types of distributions (Weibull, Lognormal, Exponential) were selected as the relationship between thermal stress model and distribution. The average insulation lifetime was estimated under the temperature stress of four types of insulation coils through the relationship between one kind of model and three kinds of distributions.
에폭시/마이크로/나노알루미나 콤포지트의 부분방전 저항성특성
박재준(Jae-Jun Park) 대한전기학회 2016 전기학회논문지 Vol.65 No.6
Neat Epoxy, nano alumina composites, micro alumina composites and multi-nano alumina composites were prepared and experiment were performed to measure their partial discharge resistant characteristics. The partial discharge resistance obtained for the microcomposites, nanocomposites and multi-nanocomposites are compared with those of unfilled epoxy and with GDE amount for surface modifier. It was observed that compare multi-nano alumina composites to micro alumina composites, the partial discharge resistance to degradation gets improved considerably. The improvement in the degradation resistance is attributed to the interface intension between the nano alumina composites and GDE , micro alumina and epoxy neat.
HVDC용, 실리콘/나노실리카 콤포지트의 경화조건을 위한 전기적, 기계적 특성
박재준(Jae-Jun Park),홍영기(Young-Gi Hong),이재영(Jae-Young Lee) 대한전기학회 2020 전기학회논문지 Vol.69 No.1
Silica / Nano Silica_20wt% Composite, a new material for power for HVDC, which has excellent electrical and mechanical properties, was manufactured. Electrical and mechanical experiments were carried out to determine the optimum mole ratio of the amount of the silicone resin and the cross-linking agent through the stoichiometric Si-H / Vinyl mole ratio. The hardening conditions were set using the results. Electrical HVDC breakdown characteristics and mechanical tensile strengths were studied at the optimum molar ratio 2, and the curing conditions were determined according to the characteristics.
환경조건의 변화에 따른 EPDM 애자의 표면 오손정도의 진단기술
박재준,최인혁,김정부,Park, Jae-Jun,Choi, In-Hyuk,Kim, Jeong-Boo 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.10
The waveforms of the leakage currents for the surface discharge according to the degree of salt contamination and the variation of environmental condition on the EPDM polymer insulators, were shown in this paper. The variation phenomena of fundamental wave, 3rd and 5th harmonic waveforms were also shown from the beginning of the applied voltage and to the flashover voltage. To develop the technique of percentage contamination degree of EPDM polymer insulator according to the variation of environmental condition, the distortion degree of 3rd and 5th harmonic wave to the fundamental wave was utilized through the spectrum analysis for the waveforms of leakage current in the simulation of salt and fog test. The fact that distortion degree % of 3rd and 5th harmonics for fundamental wave is a necessary indicator for the assessment of contamination degree for the polymer insulators, was known.
인버터 서지와 온도 스트레스 하에서 Magnet Wire 절연 수명평가
박재준,Park, Jae-Jun 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.10
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.
에폭시수지의 고전압 전원주파수 변화에 따른 장시간 전기적 트리잉 열화 특성연구
박재준(Park Jae-Jun) 대한전기학회 2013 전기학회논문지 Vol.62 No.11
Electrical tree structure is one of the most important influencing factors for electrical treeing characteristics in polymers. In this paper, we focused on the structure characteristics of electrical treeing in epoxy resins (original) insulation under different high-frequency voltages (60, 500, 1000 ㎐). Effects of voltage frequency on the ac electrical treeing phenomena in an epoxy resins were carried out in needle-plate electrode arrangement. To measure the treeing initiation and propagation, and the breakdown rate, constant AC of 10 ㎸ with three different voltage frequencies (60, 500 and 1,000 ㎐) was applied to the specimen in needle-plate electrode specimen at 30 ℃ of insulating oil bath. At 60 ㎐, the treeing initiation time was 360 min and the propagation rate was 6.85×10-4㎜/min, and the morphology was dense branch type. As the voltage frequency increased, the treeing initiation time decreased and the propagation rate increased. At 1,000 ㎐, the treeing initiation time was 0 min and the propagation rate was 7.81×10-2㎜/min, and the morphology was dense bush type.