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Dielectric Strength of Macro Interface Between Epoxy and Rubber According to the Interface Condition
吳容喆(Yong-Cheul Oh),裵德權(Duck Kweon Bae),金鎭士(Jin-Sa Kim),金忠爀(Chung-Hyeok Kim) 대한전기학회 2006 전기학회논문지C Vol.55 No.12
Macro interfaces between two different bulk materials which affect the stability of insulation system exist inevitably in the complex insulation system using in extra high voltage (EHV) electric devices. In this paper, interface between epoxy and ethylene propylene diene terpolymer (EPDM) was selected as an interface in electrical insulation system and the AC dielectric strength of the interface was investigated. Air compress system was used to give pressure to the interface. Specimens were prepared in various ways to generate different surface conditions for each type of interface. Increasing interfacial pressure, decreasing surface roughness and spreading oil over surfaces improve the AC interfacial dielectric strength. Especially, the dielectric strength was saturated at certain interfacial pressure.
22.9㎸ 배전선로 절연전선 검출용 와류탐상 센서 특성 연구
오용철(Yong-Cheul Oh),김탁용(Tag-Yong Kim),이경섭(Kyeong-Seob Lee),정한석(Han-Seok Jeong),유재식(Jae-Sik Yoo),양정권(Jung-Kwon Yang),이재봉(Jae-Bong Lee),이건행(Keon-Hang Lee),김종현(Chong-Hyun Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
We used the eddy current sensor for a 22.9㎸ distribution power line insulation cable diagnosis. The insulation cable which is used in the 22.9㎸ distribution power line is having element wire from 6 to 18. Consequently, currently to ECT applications it has a limit in the distribution power line. We about under producing to apply in pick-up coil forms and the differential total coil form where becomes sum of zero in order to have. From measurement result, partial broken cable was confirmed 500 ㎷ ~ 980 ㎷ changes from normal state.
ITO/Alq₃/Al 구조 유기 발광 소자의 유전분극 현상의 연구
吳容喆(Yong-Cheul Oh),申喆基(Cheol-Gi Shin),金忠爀(Chung-Hyeok Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.1
We have investigated dielectric polarization in organic light-emitting diodes using 8-hydroxyquinoline aluminum (Alq₃) as an electron transport and emissive material. We analyzed the dielectric polarization of organic light-emitting diodes using characteristics of impedance and equivalent circuit of ITO/Alq₃/Al. Impedance characteristics was measured complex impedance Z and phase θ in the frequency range of 1×40 ㎐ to 1×10? ㎐. We obtained complex electrical conductivity, dielectric constant, and loss tangent (tanδ) of the device at room temperature. And, we obtained the equivalent circuit of ITO/Alq₃/Al through analyzing dielectric constant and dielectric loss tangent. From these analyses, we could interpret a conduction mechanism and dielectric polarization.
22.9㎸ 배전선로 절연전선의 부식 검출 시스템 개발에 대한 연구
오용철(Yong-Cheul Oh),이건영(Keon Young Yi),김대영(Dae Young Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.7
A corrosion detecting system for 22.9 ㎸ distribution power line insulation cable, which can travel autonomously along the live line, is proposed. Eddy current test method is employed to detect the corrosion, and the system developed here is capable of detecting internal corrosion of a ACSR-OC. Somewhat details of the electrical and mechanical mechanism of the system and traveling algorithm are introduced. Experimental results applied to the sample cables having artificial corrosion and the operating distribution lines are provided. From the result, we confirmed that the system is useful for detecting internal corrosion of a ACSR, and is expected to be a new non-destructive testing equipment in the area of diagnosis for the distribution power line.
오용철(Yong-Cheul Oh),신철기(Cheol-Ki Shin),박건호(Geon-Ho Park),이덕진(Deok-Jin Lee),김충혁(Chung-Hyeok Kim),정한석(Han-Seok Jeong),최명호(Myeong-Ho Choi) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
피복 손상으로 주변 도전체를 통해 누전되었을 때 그 주변의 자장을 검출하여 누전여부를 판단할 수 있는 장치 개발을 하고자 한다. 우선 표면 누전에 의한 전류의 흐름을 조사하고, 전류에 의한 자장을 검출하기 위해 센서를 제작한다. 코어는 요크타입을 적용하였으며, 코일은 0.5㎜ 동선을 4,000회 감았다. 실험환경은 전선피복 손상에 의한 금속표면에 누전되는 상황을 모의하였으며, 부하는 40W, 400W, 1,400W를 적용하였다. 센서는 표면에 발생되는 자장을 검출할 수 있도록 2축으로 구성하였으며, 전선 주변 및 누전된 금속 표면에서 거리변화 및 각도 변화에 따른 자장을 검출하였다.
오용철,이준웅,Oh, Yong-Cheul,Lee, Joon-Ung 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.11
We have investigated dielectric properties depending on bias voltage in organic light-emitting diodes using 8-hydroxyquinoline aluminum $(Alq_3)$ as an electron transport and emissive material. We analyzed the dielectric properties of organic light-emitting diodes using impedance of characteristics. Impedance characteristics was measured complex impedance Z and phase $\theta$ in the frequency range of 40 Hz to $10^8$ Hz. We obtained complex electrical conductivity, dielectric constant, and loss tangent $(tan\delta)$ of the device at room temperature. From these analyses, we are able to interpret a conduction mechanism and dielectric properties contributed by an interfacial and orientational polarization.
RF 스퍼터링법에 의한 SCT 박막의 Sr/Ca 비율 영향
김진사,오용철,Kim, Jin-Sa,Oh, Yong-Cheul 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.4
The SCT thin films are deposited on Pt-coated electrode($Pt/TiN/SiO_2/Si$) using RF sputtering method with Sr/Ca ratio. The maximum grain of thin films is obtained by ratio of Ca at 15 mol%. The dielectric constant was increased with increasing the ratio of Ca, while it was decreased if the ratio of Ca exceeded over 15 mol%. The dielectric constant changes almost linearly in temperature ranges of $-80{\sim}+90$. All SCT thin films used in this study show the phenomena of dielectric relaxation with the increase of frequency, and the relaxation frequency is observed above 200 kHz. The current-voltage characteristics of SCT thin films showed the increasing leakage current as the measuring temperature increases.
김기준,오용철,이경섭,정한석,김탁용,최미희,송민영,신철기,김진사,Kim, Ki-Joon,Oh, Yong-Cheul,Lee, Kyeong-Seob,Jung, Han-Seok,Kim, Tag-Yong,Choi, Mi-Hui,Soung, Min-Yeong,Shin, Cheol-Gi,Kim, Jin-Sa 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2
We use the electrical energy and it is essential energy in modern life, but we lay cable underground due to the issue for environment and safety. Safety for worker is still insufficient for the development of safety equipment and related research has been focused on the cable lifetime diagnosis at underground cable work. I have to develop live line detector around the magnetic field were investigated at underground cable. In this paper, we were investigated by variation of coil turns and load due to detection of magnetic field at lines around. And detected value of developing products compared with measured value of milli-gauss meter. As a result, the value of the number of coil turns was found to be proportional to the measured value. But turn-numbers increase showed that the weak noise. I could be confirmed that sensor showed the optimum value from 4,000 to 5,0000.