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권윤혁(Yoonhyeok Kwon),강진아(Jina Kang),최효신(Hyoshin Choi),박완기(Wanki Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
에너지저장소자로 커패시터를 이용하여 순간정전 또는 순간전압강하 방지의 목적으로 사용되는 동적전압보상장치(Dynamic Voltage Restorer)에 울트라커패시터를 적용/시험하였다. 이로부터 울트라커패시터의 적용가능성을 에너지저장소자들 간의 출력특성 관점에서 비교하였다.
LDPE에서 공간전하분포와 측정전류의 시간특성에 대한 수치해석
황보승,박대희,남석현,권윤혁,한민구,Hwang, Bo-Seung,Park, Dae-Hui,Nam, Seok-Hyeon,Gwon, Yun-Hyeok,Han, Min-Gu 대한전기학회 2000 전기학회논문지C Vol.52 No.10
In this paper in order to evaluat quantitavely the formation mechanism of space charge and its effects on the conduction characteristics in LDPE we have carried out the numerical analysis on the basis of experimental results of space charge distribution cathode field and current with time which had been simultaneously measured at applied field of 50kV/mm and room temperature. As the models for numerical analysis we employ the Richarson-Schottky theory for charge injection from electrode into LDPE and the band-tail conduction at crystalline regions and the hopping conduction by traps which mainly exist at the interface regions of crystalline-amorphous region for charge transport in LDPE. Futhermore in order to investigate the influence of physical parameters on the time characteristcs of space charge distribution and measured current we have changed the values of trap density activation energies for charge injection and transport and have analyzed their effects.