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二軸延伸 폴리프로필렌薄膜의 誘電特性에 미치는 放射線照射의 影響
吳世元,賈出鉉,金旺坤 서울産業大學校 1994 논문집 Vol.39 No.1
Recently, the research on materials required for production of electric and electronic parts has strongly demanded for rapid developement in information industrial structure. But there are many different aging reasons that cause the intrinsic function of these polymers to dectrase when used insulators and dielectrics. In this research, It is studied that the variation of the dielectric characteristics of the specimen(biaxially oriented polypropylene) according to the change with irradiation dose(??Co-?? ray) of the influence of temperature and applied voltage. As for the temperature dependence of dielectric characteristics, the a peak at 110[℃] increases accordingly to the increment of irradiation which is contributed by ???crystal region. The β peak which apperas the orientation by dipoles and molecular motions in the amorphous region at about 60[℃]. For the voltage dependence of tan δat low temperature, the peak of the tan δshifts accordingly to the increasment of irradiation dose towarde the high temperature.
金旺坤 서울산업대학교 1977 논문집 Vol.10 No.1
본 논문은 polyethylene의 교류파양전압을 향상시키기 위한 하나의 방법으로서 acetophenone을 흡수시킨 경우에 있어서 여러면으로 검토한 결과를 종합한 것이다. 이 결과를 정리하면 다음과 같다. ① polythylene에 acetophenone을 흡수시키면 교유파양전압이 향상한다. 그 효과는 절록 두께가 두껍게 되면 현저하게 나타난다. 가교 poyethylene은 제조시에 가교제의 분해생성물인 acetophenone을 절록성에 함유하므로 파양전압이 높으나 가열건조하고 이것을 휘산시키면 polyethylene과 같게 된다. ② acetophenone을 흡수한 polyethylene의 교류파양저압이 향상하는 것은 온도특성 등의 실험에서 액상의 acetophenone이 polyethylene표면에 배여나오는 것에 의한 표면효과이다. 또 acetophenone은 절록체중에 존재하는 것보다 표면에 존재하는 것이 파양저압의 향상에 크게 기여한다. 실험에서 파양전압의 기여율은 표면효과가 76%, 흡수효과는 24%이였다. acetophenone을 흡수한 polyethylene은 표면에 acetophenone이 배여나와 반도체의 막을 형성하기 때문에 부분방전이 일어나기 힘들고 또 방전이 일어나도 집중하지 않는 것이 아닌가 생각된다.
徐英錫,邊龍圭,金下植,金旺坤 서울産業大學校 1975 논문집 Vol.8 No.1
There is a voltage drop in the electric power system which uses the thyristor as a speed control for the electric system. In this report, We assume the process and the controlling method for the voltage drop. The voltage drop can be controlled as shown in fig. ll when the electric power is connected to the load on parallel lines with condenser and thyristor circuit, then it can be done as a non-contact high switch.
金河植,金旺坤 서울産業大學校 1981 논문집 Vol.15 No.1
The relationships between e, b, h, d in a rotating body are derived in the laboratory frame. They are utilized, together with suitable boundary conditions, to calculate the fields that arise when conducting or nonconducting bodies of revolution rotate in externally applied de electric and magnetic fields.
低溫領易에서 Eicosamethyl Eneasiloxane의 誘電特性
金旺坤 서울産業大學校 1994 논문집 Vol.39 No.1
The study has been carried out on the dielectric characteristics of Eicosamethyl Eneasiloxane, to be regarded as the excellent dielectric strength. Three distinct types of loss mechanisms, due to dipole orientation, ionic and electronic conduction were manifest in the silicone oils. The result showed that a well-defined maximum of the absorption curves characterized by a dipole loss mechanism at a low temperature region. For temperatures in the vicinity of room temperature and higher, the loss in the range of power frequencies was predominantly of ionic nature. The increase of ionic conduction is attributed to the presence of ionizable oxidation products and their increased dissociation feature.
김왕곤,홍봉식,이형재 忠南大學校 1972 論文集 Vol.11 No.-
To investigate the mechanism in variation of dielectric strength of insulating paper due to moisture content, the experiment have been done on the current and voltage characteristics, and the relation between relative humidity and dielectric strength before breakdown occurs. The research results shows that diminishing the insulation resistance, increasing tanδ and decreasing dielectric strength of paper due to moisture content. Also it shows the mechanism in the dielectric breakdown of the thin insulating paper such as cellophane which absorbs moisture easily depending largely on ionic electric conduction.