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김창석,하충기,정천옥 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.1
Since the insulation breakdown of the large capacity motor gives a severe impact on the system and facility management the steady operation and the reliability of these facilities are highly required these days This is a review on the electrical, mechanical, thermal and environmental factors which give effects on the large capacity rotating components and a comparison between the result of the remained insulation durability test and the initial insulation status prior to operation followed by rewinding In this paper the deteriorated insulation status of main feed water booster pumps operating in YGNPP(Yong Gwang Nuclear Power Plant) 3&4 was decided and the importance of the insulation of the high voltage rotating components was analyzed by testifying and comparing the result of rewinding with the reliablity which gives effects on the facility management for the system.
RF Sputtering으로 제작한 SiO₂ 및 SiO₂/TiN 박막의 R-V 특성
김창석,하충기,김병인 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2
In this study the thin films with the structure of Si+SiO₂and Si+SiO₂+TiN are made by RF sputtering method. TIN, which has small diffusion coefficient and low resistivity, is evaporated between SiO₂and A1 layers. It investigates the V-R characteristics depending on the thickness of SiO₂which is used as insulation layer and researches its effects on voltage stability of thin film and varistor. These films show very small resistance value in negative(-) voltage and large value in positive voltage band, and with the increase of voltage, resistance value is rapidly reduced and the satisfactory characteristic of varistor is shown at +l[V]. It is found that resistance value of TIN thin film is small and also TiN thin film has more current than the thin film which is not evaporated by TIN thin film. When A1 electrode is evaporated on SiO₂thin film, spiking occurs, but the spiking can be prevented with evaporation of TIN between SiO₂and Al layers and this thin film is made easily because of its good attachment. With the increase of the resistance is changed into non-linear pattern and the bidirectional varistor characteristic is shown and then its theory can be verified by this experiment. Accordingly, when TiN is evaporated on Si Wafer(n-100), it obtains better voltage-resistance than thin film which is not evaporated and also when varistor character is used electrically to automatic control element such as elimination of flame, power distribution arrestor and constant voltage compensation, satisfactory reproducibilities are expected.
RF Sputtering으로 제작한 $SiO_2 $및 $SiO_2/TiN$ 박막의 R-V 특성
김창석,하충기,김병인 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.10
In this study the thin films with the structure of Si+SiO$_2$+TiN are made by RF supttering method. TiN, which has small diffusion coefficient and low resistivity, is evaporated between SiO$_2$ and Al layers. It investigates the V-R characteristics depending on the thickness of SiO$_2$ which is used as insulation layer and researches its effects on voltage stability of thin film and varistor. These films show very small resistance valus in negative(-) voltage and large and large value in positive voltage band, and with the increase of voltage, resistance value is rapidly reduced and the satisfactory characteristic of varistor is shown at +1[V]. It is found that resistance value of TiN thin film is small and also TiN thin film has more current than the thin film which is not evaporated by TiN thin film. When Al electrode is evaporated of SiO$_2$ thin film, spiking occurs, but the spiking can be prevented with evaporation of TiN between SiO$_2$ and Al layers and this thin films in made easily because of its good attachment. With the increase of voltage, the resistance is changed into non-linear pattern and the bidirectional varistor characteristic is shown and then its theory can be verified by this experiment. Accordingly, when TiN is evaporated of Si Wafer(n-100), it obtains better voltage-resistance than thin film which is not evaporated and also when varistor character is used electrically to automatic control element such as elimination of flame, power distribution arrestor and constant voltage compensation, satisfactory reproducibilities are expected.