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가속열화시험에 의한 18kV ZnO 피뢰기의 누설 전류 특성 분석
김주용,송일근,김찬영,문재덕,Kim, Ju-Yong,Song, Il-Geun,Kim, Chan-Yeong,Mun, Jae-Deok 대한전기학회 2002 전기학회논문지C Vol.51 No.2
This paper provides the results of accelerated aging test of 18kV ZnO lightning arresters to investigate the leakage current characteristics. It was impossible to establish the replacement criterion for field operating lightning arrester because conventional aging test was only focused on the aging of ZnO elements. In general, it is possible to replace the aged arresters before the failure in the field using the leakage current measurement because it must be increased by the aging. But we can not use the method because we don't know the characteristics of the installed lightning arresters. Therefore in this paper we applied operating voltage and accelerating cycle which consists of temperature and humidity to the arresters. Then we measured the variation of total and resistive leakage current and found out the characteristics of the acted lightning arresters.
3.3㎸, 15㎸A급 3-레벨 NPC PWM 컨버터의 중성점 전압제어에 관한 연구
안준선(Joonseon Ahn),주형길(Hyeong-Gil Joo),서명석(Myung-Seok Seo),문승일(Seung-Il Moon),김주용(Ju-Yong Kim),송일근(Il-Geun Song) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Recently, many researchers has been focused the “Smart Grid” system because the market of replacement of old distribution system has been increasing. The solid-state transformer is one of main component of “Smart Grid” system, it is important to develop the transformer. In this paper, 3.3[㎸] 15[㎸A] solid-state transformer has developed. Three-level diode clamped PWM converter-inverter was used in the transformer, therefore the voltage balancing algorithm between DC link capacitors also applied. We verified the solid-state transformer with computer simulation and experiment, voltage balancing was kept well