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N<sub>2</sub>/O<sub>2</sub> 혼합가스 중 적층된 고체유전체에 대한 연면방전의 메커니즘과 특성
임동영,최은혁,최상태,배성우,이광식,최병주,Lim, Dong-Young,Choi, Eun-Hyeok,Choi, Sang-Tae,Bae, Sungwoo,Lee, Kwang-Sik,Choi, Byoung-Ju 한국조명전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.8
This paper presents the surface flashover mechanism of a laminated solid dielectric and describes the surface flashover characteristics with the inherent capacitance of the laminated solid dielectric in a $N_2/O_2$ mixture gas (8:2) under an quasi uniform field. It was found that the electron emission at a cathode and the high-local electric field region around an anode were important factors to reasonably describe the surface flashover mechanism. The surface flashover voltage by the mechanism decreased with the inherent capacitance increase of the laminated solid dielectric. In addition to the surface flashover mechanism and its characteristics, the surface flashover voltage equations as a function of the inherent capacitance were derived by considering a gas pressure used in future eco-friendly GIS and the factors influencing the surface flashover.
친환경 절연설계를 위한 N<sub>2</sub>/O<sub>2</sub> 혼합가스 중 고체유전체 종류에 따른 연면방전특성
임동영,박혜리,최은혁,최상태,이광식,Lim, Dong-Young,Park, He-Rie,Choi, Eun-Hyeok,Choi, Sang-Tae,Lee, Kwang-Sik 한국조명전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.3
In this paper, we deal with a surface discharge that caused an aggravation of the dielectric strength in the $N_2/O_2$ mixture gas, When composit dielectrics were formed from the use of a solid dielectric. It was found from this study that the surface discharge voltage was deeply involved in the mixture ratio of $O_2$, the electrical property of the solid dielectric, kind of the solid dielectric, an electric field at the triple junction and a medium effect. These results expect basic data that will be used to transmission and distribution power system equipment using the $N_2/O_2$ mixture gas.
Fibroin의 진화와 alanine, glycine을 암호화하는 동의 코돈 사용에 관한 연구
임동영,서동상 성균관대학교 생명과학자원연구소 1997 生命資源科學硏究 Vol.4 No.2
Fibroin proteins have evolved from a ancestor for having the least volume in the limited conditions. It is appeared that the correlation between the volume of amino acids and the number of amino acids in fibroin is highly negative. All the more we are confident of the result because an inverse proportion between the volume of known proteins and the diffusion coefficient of them is approved. Furthermore synonymous codon usage of both alanine and glycine is nonrandom. We thought that the preference resulted from natural selection because using a codon that is translated by an abundant tRNA species will increase translational efficiency and accuracy. That is fibroin gene is also applied to genome hypothesis.
N2/O2 혼합가스 중 적층된 고체절연물의 연면절연성 향상에관한 연구
임동영,박혜리,박숭규,최상태,박원주,이광식 한국조명·전기설비학회 2012 한국조명·전기설비학회 학술대회논문집 Vol.2012 No.10
본 논문은 적층되어진 고체절연물을 적용시켜 N2/O2 혼합가스 중 연면절연성 향상을 연구한 논문이다. 적층된 고체절연물의 장점은 고유용량에 의한 전압분배, 삼중점 전계의 조절로 추측되어졌고, 그 추측은 실험결과를 고찰하는데 유용하게 적용되었다. 동일한 고체절연물로 적층한 경우는 삼중점 전계가 연면절연성에 지배적이었고, 상부측의 고체절연물을 변화시킨 경우는 고유용량에 의한 전압분배의 효과가 나타났다. 이 효과는 적층된 고체절연물의 비유전율 차이가 커야 나타남을 확인하였다. 이 논문의 결과는 연면절연성 향상에 유용한 자료가 될 것이다
전계해석과 기체방전 이론을 기반으로 한 Polyvinyl-Chloride-Sheathed Flat Cord 표면의 트래킹 진전 메커니즘
임동영,박혜리,지승욱 한국화재소방학회 2019 한국화재소방학회논문지 Vol.33 No.2
Tracking, which is one of the main causes of electrical fires, is perceived as a physical phenomenon of electricaldischarge. Hence tracking should be explained based on electric field analysis, conduction path by electron generation, andgas discharge physics. However, few papers have considered these details. This paper proposes a tracking mechanismincluding their effects on tracking progress. In order to prove this mechanism, a tracking experiment, an electric fieldanalysis for the carbonization evolution model, and an explanation of the tracking process by gas discharge physics wereconducted. From the tracking experiment, the current waveforms were measured at each stage of the tracking progress fromcorona discharge to tracking breakdown. The electric field analysis was carried out in order to determine the electric fieldon the surface of a dry-band and the high electric field region for electron generation during the generation and progressof carbonization. In this paper, the proposed tracking mechanism consisted of six stages including electron avalanche bycorona discharge, accumulation of positive ions, expansion of electron avalanche, secondary electron emission avalanche,streamer, and tracking by conductive path. The pulse current waveforms measured in the tracking experiment can beexplained by the proposed tracking mechanism. The results of this study will be used as the technical data to detect trackingphenomenon, which is the cause of electric fire, and to improve the proof tracking index. 전기 화재의 주요 원인 중 하나인 트래킹은 전기적 방전에 의한 물리적 현상으로 인식된다. 따라서 트래킹은 전계해석, 전자생성에 의한 도전성 경로, 기체방전이론을 기반으로 설명되어야 한다. 하지만, 이러한 사항을 반영한 연구논문은 드물다. 본 논문은 트래킹 진전에서 그들의 영향을 포함한 트래킹 진전 메커니즘을 제안하였다. 그 메커니즘의 제안을 위해, 트래킹 실험, 탄화진전 모델에 대한 전계해석, 연면방전 이론을 적용한 트래킹 진전과정에 대한 설명이 수행되었다. 트래킹 모의실험으로부터, 코로나 방전에서 트래킹 파괴까지 트래킹 진전의 각 단계에서 전류파형이 측정되었다. 전계해석은 탄화의 발생과 진전과정동안 건조대 표면의 전계와 전자생성을 위한 고전계 영역을 파악하기 위해 수행되었다. 본 논문에서 제안된 트래킹 메커니즘은 코로나 방전에 의한 전자사태, 양이온의 축적, 전자사태의 확장, 2차 전자사태, 스트리머, 도전성 경로에 의한 트래킹 파괴의 6단계로 구성된다. 트래킹 모의실험에서 측정된 펄스성 전류파형은 제안된 트래킹 메커니즘에 의해 설명될 수 있었다. 본 연구 결과는 화재의 원인인 트래킹을검출하고, 내트래킹성을 높이는 데 필요한 기술 자료가 될 것이다.
불평등 전계 중 불량 접촉갭에 관한 N<sub>2</sub>/O<sub>2</sub> 혼합가스의 연면플래쉬오버특성
임동영,최은혁,최상태,최병주,이광식,배성우,Lim, Dong-Young,Choi, Eun-Hyeok,Choi, Sang-Tae,Choi, Byoung-Ju,Lee, Kwang-Sik,Bae, Sungwoo 한국조명전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.8
This paper presents the surface flashover characteristics to simulate the poor contact between an anode and a solid dielectric in a $N_2/O_2$ mixture gas (8/2) under a non-uniform field. The surface flashover voltage of the $N_2/O_2$ mixture gas revealed the irregular tendency that was not in accordance with the Paschen's law with an increasing gap of the poor contact. In addition, the insulation performance of the $N_2/O_2$ mixture gas at 0.6MPa was comparable to that of $SF_6$ gas of 0.1MPa based on the insulation performance on the poor contact. These results are able to apply the insulation design of eco-friendly gas insulation switchgear considering the internal faults.
불량접촉을 가지는 불평등 전계에서 SF6와 SF6 대체가스들의 연면절연성능
임동영,배성우,최상태,최병주 한국조명.전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.4
This paper presents the surface insulation performance of SF6 and SF6 alternative gases (N2/O2 mixed gas (8/2), CO2, N2) in the non-uniform field with a faulty contact between a high voltage electrode and a solid dielectric. Surface discharge experiments were conducted using a knife-shaped electrode and 60Hz AC high voltage in order to measure the surface flashover voltages. Experimental results showed that the surface insulation performance of the used gases depended on their electron attachment cross sections. Abstruse-insulation characteristics of CO2 and N2 were described in detail using collision ionization coefficient in the electric field range of the experimental conditions.