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고분자전해필 연료전지 분리판용 316 스테인리스강의 전기전도도에 미치는 Nb, Ti 첨가 및 표면처리 효과
이석현(Lee, Seok-Hyun),김정헌(Kim, Jeong-Heon),김민철(Kim, Min-Chul),천동현(Chun, Dong-Hyun),위당문(Wee, Dang-Moon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
Nb and Ti were added to 316 stainless steel, and then heat-treatments and surface treatments were performed on the 316 stainless steel and the Nb- and Ti-added alloys. All samples indicated enhanced electrical conductivity after surface treatments, whereas they showed low electrical conductivity before surface treatments due to the existence of non-conductive passive film on the alloy surface. In particular, the Hb- and Ti-added alloys showed remarkable enhancement of electrical conductivity compared to the original alloy, 316 stainless steel. Surface characterization revealed that small carbide particles formed on the alloy surface after surface treatments, while the alloys indicated flat surface structure before surface treatments. Cr_{23}C<sub>6</sub> mainly formed on the 316 stainless steel, and NbC and TiC mainly formed on the Nb- and Ti-added alloys, respectively. We attribute the enhanced electrical conductivity after surface treatments to the formation of these carbide particles, possibly acting as a means of electro-conductive channel through the passive film. Furthermore, NbC and TiC are supposed to be more effective carbides than Cr_{23}C<sub>6</sub> as electro-conductive channels of stainless steel
김경화(Kyung-Hwa Kim),김대헌(Dae-Heon Kim),이석현(Seok-Hyun Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.7
The electric propulsion system requires more reliability and safety than the conventional propulsion system because any sudden changes of electric system would bring tremendous effects on the ship’s safety and propulsion. So it is very important to consider the potential transient effects. This paper discusses one of the worst electric accident. That is, one or two of generators are out of service in normal seagoing condition. And the appropriate measures are simulated in order to prevent the frequency decline that can bring the other generator’s tripping. In addition, the relation between the transient effects and the major factors(inertia of generator/motors, governor’s drooping characteristic and response speed) are also identified using the ETAP software.