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조성훈(S.-H. Cho),이종철(J.-C. Lee),최명준(M.-J. Choi),권중록(J.-R. Kwon),김윤제(Y.-J. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A Study on the Characteristics of Vacuum Arcs Influenced by a Lorentz Force The experiments applied high-current for the improvement of the interruption capacity within the vacuum interrupter require enormous expenses and excessive time. In this study, the characteristics of vacuum arcs influenced by a Lorentz force were calculated by a commercial multiphysics package, ANSYS. We assumed the diffused-mode arc within an AMF vacuum interrupter. It was found that the Lorentz force generated by a current path caused an arc constriction and increased the axial temperature between the electrodes. Also, we analyzed the constriction of the anode surface and asymmetric temperature distribution.
진공 차단기 내 아크 플라즈마 집중 메커니즘에 대한 연구
조성훈(S.-H. Cho),이종철(J.-C. Lee),최명준(M.-J. Choi),권중록(J.-R. Kwon),김윤제(Y.-J. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The vacuum interrupter (Ⅵ) has been used to medium-voltage switching circuits as an environmental friendly circuit breaker. An understanding of the vacuum arc flow phenomena is very important for improving the performance of vacuum interrupter. In order to understand the vacuum arc phenomena, it is necessary to predict the magnetohydrodynamic (MHD) characteristics by the multidisciplinary numerical modeling, which is coupled with the electromagnetic and the thermal-flow fields. The heat flux and the local temperature on the electrode are increased by arc constriction, which is influenced by Lorentz force. It has undesirable influence on the characteristics of vacuum arc. In this study, we have investigated arc plasma constriction mechanism with the high-current vacuum arcs with an AMF electrode by using a commercial finite element analysis (FEA) package, ANSYS. The predicted results are verified with the results of temperature distributions.
조성훈(S.-H. Cho),이종철(J.-C. Lee),최명준(M.-J. Choi),권중록(J.-R. Kwon),김윤제(Y.-J. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The vacuum interrupter (VI) is widely used in medium-voltage switching circuits due to its abilities and advantages as an environmental friendly circuit breaker. An understanding of the vacuum arc flow phenomena is very important for improving the performance of vacuum interrupter. In order to closely examine the vacuum arc phenomena, it is necessary to predict the magnetohydrodynamic (MHD) characteristics by the multidisciplinary numerical modeling, which is coupled with the electromagnetic and the thermal flow fields, simultaneously. In this study, we have investigated arc plasma constriction phenomena and an effect of AMF on the arc plasma with th high-current vacuum arcs for the cup-type AMF electrode by using a commercial finite element analysis (FEA) package, ANSYS. The simulation results applied with various AMFs and constant Joule heat generation show that strong axial magnetic field (AMF) permits the arc to be maintained in a diffused mode to a high-current vacuum arc. However, further studies are required on the two-way coupling method and radiation model for arc plasma in order to accomplish the advanced analysis methad.
조성훈(S.-H. Cho),이종철(J.-C. Lee),최명준(M.-J. Choi),권중록(J.-R. Kwon),김윤제(Y.-J. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The vacuum interrupter (VI) is used for medium-voltage switching circuits due to its abilities and advantages as a compacted environmental friendly circuit breaker. A enough understanding of the vacuum arc physics is very important since it can aid to improve the performance of vacuum interrupter. In this study, the thermal-fluid characteristics of high current vacuum arcs were calculated by a commercial multiphysics package, ANSYS, in order to obtain Joule heat, Lorentz force and the interactions with flow variables. It was found that arc plasma constriction mechanism was by Lorentz force 3D component, and it caused temperature constriction on the anode surface. However, we should need further studies on the two-way coupling method and radiation model for arc plasma in order to accomplish the advanced analysis method for multi physics.
김종규(J.K. Kim),조성훈(S.H. Cho),박일흠(I.H. Park) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
To get the maximum diffusion boundary of thermal effluent from Ha-Dong Thermal Power Plant, paths of TGPS Buoy and surface water temperature were obtained to 4 times at spring tide during 1 year. According to the paths of TGPS Buoy, the flumes of thermal effluent were moved about 25㎞ from outlet to Nand S direction in Gwangyang Bay. After 2-3 times of tidal period the waters were reached to Yosu Bay because the tidal current was predominant in that area. At the summer and winter season, a sudden drop of surface water temperature was detected around 3.5~4㎞ and 1.6~2㎞ radius from the outlet, respectively.