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방사선조사에 의한 R-C 직.병렬회로에서의 손상효과에 관한 연구
서국철,조성욱 한국조명전기설비학회 1987 조명.전기설비 Vol.1 No.2
The characteristis of all the instruments and materials used in atomic industry are changed due to irradiation damages by the effects of radiation activities. In this study when R-C series-parallel circuits are irradiated by $\gamma$-ray, variations in its electrical properties have been investigated. The following results are obtained. 1) In the R-C series circuit, the impedance variation ratio is increased as the irradiation quantity is increased up to $10^6[r]$, and above $10^6[r]$, the impedance variation ratio reached at the saturated condition. In the saturated condition, the increasing value was about 1.25 (%). 2) In the R-C series circuit, the power factor variation ratio is decreased as the irradiation quantity is in creased up to $10^6[r]$, and above $10^6[r]$, the power factor variation ratio reached at the saturated condition. In the saturated condition, the decreasing value was about 0.5(%). 3) In the R-C parallel circuit, the impedance variation ratio is increased as the irradiation quentity is increased up to $10^6[r]$, and above $10^6[r]$, the impedance variation reached at the saturated condition. In the saturated condition, the increasing value was about 0.5.(%). 4) In the R-C parallel circuit, the power factor variation ratio is decreased as the irradiation quantity is increased up to $10^6$[r], and above $10^6$[r], the power factor variation ratio reached at the saturated condition. In the saturated condition, the decreasing value was about 1.3(%). 원자력 산업에서 사용되고 있는 모든 재료의 특성은 방사선조사에 의한 손상효과로 변하게 된다. 본 연구에서는 저항과 콘덴서의 직.병렬회로에서의 방사선조사에 의한 전기적 특성이 여하히 변화되는가를 연구하였다. 연구결과 얻어진 주요 결론은 다음과 같다. 1. R-C 직렬회로에서 조사선량이 $10^6[r]$까지는 임피던스변화율이 증가되다가 그 이상의 조사선량에서는 포화상태에 이르게 되는데 포화상태에서의 증가율은 1.25[%]정도이었다. 2. R-C 직렬회로에서 조사선량이 $10^6[r]$ 까지는 증가변화율이 감소되다가 그 이상의 조사선량에서는 포화상태에 이르게 되는데 감소율은 0.5[%]정도이었다. 3. R-C 병렬회로에서는 방사선량이 $10^6[r]$까지는 임피던스변화율이 증가되다가 그 이상의 방사선량에서는 포화상태에 이르게 되는데 증가율은 0.5[%]정도이었다. 4. R-C 병렬회로에서는 방사선량이 $10^6[r]$까지는 감소되다가 그 이상의 방사선량에서는 포화상태에 이르게 되는데 감소율은 1.3[%]정도이었다.
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부성기체 $SF_6$Gas의 방전특성과 고기압 $SF_6$Gas중에서의 impulse corona에 관한 소고
서국철 대한전기학회 1976 전기의 세계 Vol.25 No.6
과거 수십년간 전력계통의 절연에 쓰여 온 공기에 대치하여 근년 고기압 SF$_{6}$gas에 의한 gas절연 방식이 급속도로 진전되고 있으며 거기에 수반하여 SF$_{6}$gas의 방전특성 해명이 초고압 장 gap영역에서 급선무로 되어 있다. 또한 초고압송전에 대응하는 각종 전력기기 cable등의 고기압 절연이 실용화 하게 되었으며 신뢰도가 높고 합리적인 gas 절연기기의 설계를 목표로 부성기체 특히 고기압 SF$_{6}$gas의 절연파괴 특성의 연구가 진행되고 있다. 고기압 SF$_{6}$gas는 높은 파괴 전체를 가지므로 극히 적은 원인으로도 절연 특성에 영향을 미치며 공기, 질소등 기체와는 매우 다른 방전 특성을 나타낸다. 여기서는 SF$_{6}$gas의 특이한 방전 특성과 고기압 SF$_{6}$gas 중에서의 impulse corona의 특성을 고찰하려고 한다.
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徐國哲 光云大學校 1976 論文集 Vol.5 No.-
The latest expansion and Super high voltage of the electric power System are urging the elevation of its trust. In response to such a demand, this thesis is studying largely on the insulators related to generation, transformation, plower transmission and distribution, the relations between the Stained factors of the insulators and the flash-over voltage, and the main influencing factors on the moisture absorbed phenomena of the insulators' stain which is related to the flash-over voltage inseparably.
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徐國哲 光云大學校 1980 論文集 Vol.9 No.-
In this Study, I experimented the process of moisture absorbed of salt and Kaolin on the Surface of insulators adhered the materials of unsolubility in water, Kaolin(Al₂O₃.2SiO₂.2H₂O), and materials of Solubility in water, Salt, (NaCl), and how the leakage resistance of Surface changes by the film of an aqueous solution of electric conduction formed at that time. I experimented this sample stained plane on glass made by myself in the thermostat.
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徐國哲 光云大學校 1981 論文集 Vol.10 No.-
It has been known that D.C. breakdown voltage is lower than A.C, breakdown voltage in insulating oil, but there are still many unvivid points at electric conduction in breakdown or under of high electric field. This study measured the electric current-electric field characteristics(I-E characteristics) and the breakdown voltage under of D.C. electric field of insulating oil using the system of electrodes that are near the uniform electric field with a result. I can study, electric conduction in area of high electric field depends upon the Schottky effect. The liquidity of breakdown electric field takes place by the local concentration of electric field. The longer gap is and the more electric current is the more breakdown voltage decreased. There are not almost the change of electric current-electric field characteristics by materials of electrode.
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徐國哲 光云大學校 1984 論文集 Vol.13 No.-
Various dielectric liquids have been long used as main insulating materials of electric machines, but as compared with solid or gas we have still much wonder not to be known in conduction mechanism and breakdown mechanism. In this research I'm going to make inquires about how the Impurities in insulating oil have influence on the high electric field conduction and the preliminary phenomena of breakdown. For the purpose of the research, I tried to measure the breakdown, voltage of transformer oil(O.T) under D.C, A.C. electric field using the electrode system of uniform field.
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