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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.
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.
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.
액상실리콘고무/나노 실리콘카바이드 복합체의 부분방전 저항성 특성
박재준(Jae-Jun Park) 대한전기학회 2021 전기학회논문지 Vol.70 No.4
For the development of HVDC cable connector, Nano SiC was corroded in H₂O₂ to form Si-OH . On the basis of SiR, Nano SiC was chemically treated with vinylsilazane. Samples were prepared by homogeneously dispersing the modified Nano SiC in silicon according to the doping level content (0, 1, 3, 5, 7, 9 wt%). It is to develop a controllable material with nonlinear conductivity that can homogenize electrical stress in HVDC cable connectors. In addition, in order to develop a material with strong partial discharge resistance and thermal conductivity, high voltage stress was applied for 500 hours in a 5kV/720Hz environment. As a result, the erosion depth of the surface was measured. Heat conduction was measured and evaluated to investigate the effect of high voltage stress on heat conduction.
나노 실리카 충진함량 변화에 따른 EMNC의 특성 연구 (2) -기계적, 전기적 특성 중심으로-
박재준,Park, Jae-Jun 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.11
In order to develop electrical insulation materials, epoxy-nanosilica-microsilica mixture composites (ENMC) was synthesized, and mechanical properties such as their tensile and flexural strength, and AC insulation breakdown strength were investigated. Properties of mechanical strength and AC insulation breakdown strength are analyzed as scale and shape parameter with respect to weibull plot. Their tensile and flexural strength, AC insulation breakdown strength were compared original epoxy or EMC to ENMC. The 4 phr nano-silica addition and the 65 wt% micron-silica mixture composite (ENMC) was found to have the highest tensile and flexural strength. In the tensile strength was improved 29%, and flexural strength was improved 60.9% higher than those of the original epoxy. In the insulation breakdown strength, ENMC_4 phr was improved 17% and ENMC_5 phr was improved 15.8% higher than those of the EMC.
저농도 알칼리-요소 전처리가 SwBKP의 고해특성에 미치는 영향
박재준(Jae-Jun Park),최경화(Kyoung-Hwa Choi),조병욱(Byoung-Uk Cho) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.5
Effects of low concentration alkali-cosolvent swelling pre-treatment on beating characteristics of softwood bleached kraft pulp (SwBKP) fibers was investigated. Urea was applied as a cosolvent. When the pulp was swollen at a low concentration below 2% (based on the oven-dried pulp), the weight loss was below 1%. NaOH treatment below 2% concentration could improve the swelling of SwBKP. Addition of urea with NaOH solution promoted the swelling. In addition, low concentration NaOH-urea pre-treatment reduced the beating time to reach a certain level of beating degree. Lowest freeness level was obtained when SwBKP was treated with 1% NaOH while highest fibrillation level was obtained at 2% NaOH and 1% urea. It could be concluded that grinding efficiency could be improved by the low concentration alkali-cosolvent swelling while optimization for the pre-treatment is necessary.
칼륨계 증해 약품을 이용한 닥나무 인피섬유의 저온 증해 특성 평가
박재준(Jae-Jun Park),최경화(Kyoung-Hwa Choi),조병욱(Byoung-Uk Cho) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.3
This study was conducted to investigate the efficiency of low-temperature cooking of paper mulberry using KOH, which is one of main components of the Korean traditional pulping chemicals. Cooking of paper mulberry bast was performed at various KOH or NaOH concentrations at low temperature (100°C and 120°C). Then, changes in pulping characteristics were evaluated in terms of Kappa number, pulping yield, viscosity of pulp and the degree of polymerization (DP) of cellulose. It was found that the paper mulberry bast fiber having a high molecular weight cellulose can be produced by a low-temperature cooking with KOH. Delignification and screening yield of paper mulberry bast fibers with the low-temperature KOH cooking were similar with that with the low-temperature NaOH cooking. However, cooking with KOH could produce the bast fibers with higher DP of cellulose than that with NaOH.