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HVDC適用을 考慮한 高密度폴리에틸렌에틸렌비닐아세테이트 混合 絶緣物의 內部電界 및 電位分布에 關한 考察
유종철,이흥규 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
Recently, many attention has been paid to blended polymer power cable for HVDC. The electric field in an insulation system is decided by its conductivity or space charge for DC. Also, the conductivity or space charge is very sensitive to additives, impurities, or physical structure of insulating polymer. In this study, we tried to overcome the defects by mixing HDPE and EVA has good miscibility with the ratios of 80:20, 70:30, 60:40, 50:50 respectively. The basic properties such as FE-SEM and XRD analysis, FT-IR analysis are discussed. In the internal electric field and potential distribution analysis, we investigated tendency with applied voltage variation, also applied time dependency of internal electric field and potential distribution calculated from space charge density distribution according to blend ratio each specimen. Through this experiment, we present mixture ratio with optimal insulation performance for HVDC transmission and distribution cable.
劉鐘哲 忠州大學校 1986 한국교통대학교 논문집 Vol.19 No.2
With the development of civilization, the excessive demand of electric power has been increased. Also, the durable stabilization, confidance and ultra high voltage of electric power is demanded essentially. Recently, much interest has been focussed upon the tree phenomenon which is one of cause controlling the life of insulate materials. In this work, we have investigated the elements of occurrence and processing process of electric tree and phenomenon in water and oil.
유종철 대한양계협회 2005 월간 양계 Vol.37 No.7
닭에 있어서 대장균은 대부분 축주들이 생각 하시는 것처럼 소화기관을 통하여 감염되기 보다는 오히려 호흡기관을 통하여 공격받게 되는 비율이 높기 때문에 대장균을 소화기계통의 원인균이라고 하기보다 전신성 질병의 원인균으로 보아야 할 것이다. 근년에 와서 병원성 대장균에 의한 대장균증이 육계, 산란계, 종계에 까지 그 피해가 매우 커지고 있다.