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초고압 복합소호 차단기의 단순 물리 아크모델에 대한 해석연구
박지용(Jee-yong Park),김견우(Kyoun-woo Kim),배채윤(Chae-yoon Bae),안길영(Kil-Young Ahn),김영근(Young-geun Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Nowadays, Demands and trends in high voltage Self-blast circuit breakers are toward compactness and cost efficiency, so most of GIS designers prefer adequate computer simulation in the design phase in order to achieve compact size together with the performance of products. However, The CFD commercial software takes a considerable amount of time to simulate the arc phenomenon of the HV circuit breaker. A simplified physical arc model was introduced as a way to overcome these issue and it provides possibility to get relatively simple, and easy to use, simulation software for high voltage Self-blast circuit breakers. Such software has been developed and successfully used in development of Self-blast circuit breakers.
박우진(Woo-Jin Park),김일현(Il-Hyun Kim),조해용(Hae-Yong Jo),김영근(Young-Guen Kim),안길영(Kil-Young Ahn) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
A low voltage DC(Direct Current) circuit breaker is an electric control device that interrupts the abnormal currents which result from the over-loads or short-circuits in a low voltage(less than 1,500Vdc) distribution line. Recently, higher current breaking performance has become crucial in providing the reliability for the modern devices requiring small scale and high performance. When a short circuit occurs, a fault current flows between contacts of DC circuit breaker even though they are separated by the protective control system. Arc voltage between contacts of circuit breaker should generate as high as possible during breaking phase. High arc voltage could lead the main circuit to zero arc current so that arc plasma is eliminated. Based on this behavior, arc extinction system of a circuit breaker should be designed for increasing arc voltage during breaking period of the current. Since DC does not have current zero point, it can be more difficult and important to secure the breaking performance. There are conventional methods that are widely known as arc extinction methods and most of them involve method for increasing arc voltage. In this paper, experiments and CAE analysis were carried out to find out the criteria of the arc extinction and to verify the validity of methods of extinguishing an electric arc.