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분포통계모델에 의한 가교폴리에틸렌 절연체의 부분방전 패턴해석
김탁용,박희두,조경순,박하용,홍진웅,Kim Tag-Yong,Park Hee-Doo,Cho Kyung-Soon,Park Ha-Yong,Hong Jin-Woong 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.10
It has been confirmed that the inner defect of insulator and the perfect diagnosis for aging are closely related to safe electric power transmission system and that the detection of accident and diagnosis technique turn out to be very important issues. But perfect diagnosis is difficult because discharge pattern is irregular. Thus, we investigated discharge pattern using the new distribution statistical models with cross-inked polyethylene(XLPE) specimens. Voltage was applied to power frequency by step method, and calibration of discharge was set to 50 pC. After the voltage was applied, it measured the discharge occurring during 10s. We investigated discharge pattern using the K-means analysis and Weibull function. We also investigated variation of centroid and shape parameter due to variation of voltage. As a result of analyzing K-means, it was confirmed that cluster including many object numbers was formed by the presence of void. And result of Weibull distribution, it was confirmed that shape parameter of discharge varied from 1.28 to 1.62 in no void specimens, and that shape parameter of discharge number varied from 1.28 to 1.62. In the void, shape parameter of discharge varied from 5.66 to 6.43, and shape parameter of discharge number varied from 5.05 to 5.08.
김창훈,이영상,강용길,박희두,신종열,홍진웅,Kim, Chang-Hoon,Lee, Young-Sang,Kang, Yong-Gil,Park, Hee-Doo,Shin, Jong-Yeol,Hong, Jin-Woong 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.10
This research shows the electrical characteristic using excellent epoxy nano-composite of MgO 5.0 wt% and $SiO_2$ 0.4 wt% in mechanical strength test depending on nano-additive. First of all, volume resistance depending on nano-additive and temperature using high resistance meter (HP. 4329A) by increasing 10, 100, 1,000 V of applying voltage was measured. Moreover, temperature range of $25{\sim}120^{\circ}C$ with virgin sample was tested using TO-9B oven by Ando Company. The result showed that virgin and the samples added with MgO and $SiO_2$ had similar value of volume resistance in low temperature and low electric field region and reduced with slow slope. The nano-composite's volume resistance of sample added with MgO and $SiO_2$ had higher value than virgin sample's volume resistance in high temperature region more than $80^{\circ}C$. Moreover, the slope has steeply reduced. The volume resistance of sample added with MgO 5.0 wt% was $8.38{\times}10^{13}\;{\Omega}{\cdot}cm$ and it was 6.8 times more than virgin sample in high temperature at $120^{\circ}C$. The insulation characteristics were constant although filler has changed in low temperature region. But, in high temperature region, the value of volume resistance of sample with MgO 5.0 wt% was 7.6 times more than the virgin sample's volume resistance.
유기 광기전 소자의 전기적 특성에 미치는 산소 플라즈마 처리의 영향
오동훈(Dong-Hoon Oh),이영상(Young-Sang Lee),박희두(Hee-Doo Park),신종열(Jong-Yeol Shin),김태완(Tae-Wan Kim),홍진웅(Jin-Woong Hong) 대한전기학회 2011 전기학회논문지 Vol.60 No.12
An indium-tin-oxide (ITO) is normally used as a substrate in organic photovoltaic cells. We examined the effects of an oxygen (O₂) plasma treatment on the electrical properties of an organic photovoltaic cell. Experiments with four-point probe method and atomic force microscope revealed the lowest surface resistance of 17.64 Ω/sq and the lowest average surface roughness of 1.39 ㎚ at the plasma treatment power of 250 W. A device structure of ITO/CuPc/C60/BCP/Cs₂CO₃/Al was fabricated by thermal evaporation with and without the plasma treated ITO substrate. It was found that the power conversion efficiency of the cell with the plasma treated ITO is 65 % higher than the one without the plasma treated ITO.