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Characteristics of Interruption Ability in DC Circuit Breaker using Superconducting Coil
In-Sung Jeong(정인성),Hye-Won Choi(최혜원),Jeong-Il Youn(윤정일),Hyo-Sang Choi(최효상) 대한전기학회 2019 전기학회논문지 Vol.68 No.1
Development of DC interruption technology is being studied actively for enhanced DC grid reliability and stability. In this study, coil type superconductor DC circuit breaker was proposed as DC interruption. It is integration technology that combined current-limiting technique using superconductor and cut-off technique using mechanical DC circuit breaker. Superconductor was applied to the coil type. In simulation, Mayr arc model was applied to realize the arc characteristic in the mechanical DC circuit breaker. PSCAD/EMTDC had used to model and perform the simulation. To find out the protection range of coil type superconductor DCCB, the working operation have analyzed based on the rated voltage of DCCB. The results confirmed that, according to apply the limiting device, the protection range was increased in twice. Therefore, the probability of failure of interruption has lowered significantly.
60kW급 영구자석형 소형 풍력발전기의 축방향 길이에 변화에 따른 유한요소 해석
정인성(In-Sung Jeong),최현준(Hyun-Jun Choi),박지훈(Ji-Hoon Park),최혜원(Hye-Won Choi),최만수(Man-Soo Choi),최장영(Jang-Young Choi),우종현(Jong-Hyeon Woo) 대한전기학회 2021 전기학회논문지 Vol.70 No.3
In this paper, a permanent magnet synchronous generator that is easy to maintain and has excellent efficiency and small size. For the development of a small wind power generator that permanent magnet synchronous generator was applied. For this, the initial design of the permanent magnet synchronous generator and finite element analysis were conducted. Through finite element analysis, the efficiency and harmonics of the generator could be analyzed. As a result, it was confirmed that the efficiency was all 94% or more. The harmonic analysis results are also approximately 0.13%. The permanent magnet synchronous generator is considered to be most suitable for small wind power generators.
Electric Power Characteristics of a SFCL based on Turn-ratio of 3-Phase Transformer
In-Sung Jeong(정인성),Hyo-Sang Choi(최효상),Byung-Ik Jung(정병익) 대한전기학회 2014 전기학회논문지 Vol.63 No.3
At present, the demand for electric power increases, the electric power system is complicated. The size of the line-to-ground fault and the line-to-line fault occurred with complication of electric power system continue to increase, therefore several issues are raised. To address these issues effectively, the superconducting fault current limiter (SFCL) has been proposed, this study is ongoing. In this paper, we applied the SFCL in three-phase transformer and comparative analysis of the electric power burden to the SFCL. The superconductor is combined to the third winding of transformers in connection structure. In case of a third line-to-line fault, we did comparative analysis of the electric power burden to the SFCL based on the turn ratio of transformer third winding. In this case, we could confirm as the third turn ratio increased, electric power impressed to the superconducting element increased.