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Characteristic Analysis of HTS EDS System with Various Ground Conductors
배덕권,고태국 한국초전도.저온공학회 2010 한국초전도저온공학회논문지 Vol.12 No.2
This paper deals with numerical analysis on a high-Tc superconducting (HTS) electrodynamic suspension (EDS) simulator according to the variation of the ground conductor conditions. Because the levitation force of EDS system is formed by the magnetic reaction between moving magnets and fixed ground conductors, the distribution of the magnetic flux on a ground conductor plays an important role in the determining of the levitation force level. The possible way to analyze HTS EDS system was implemented with 3D finite element method (FEM) tool. A plate type ground conductor generated stronger levitation force than ring type ground conductor. Although the outer diameter of Ring3 (335 mm) was larger than that of Ring2 (235 mm), the levitation force by Ring2 was stronger than that by Ring3. Considering the results of this paper, it is recommended that the magnetic flux distribution according to the levitation height and magnet current should be taken into account in the design of the ground conductors.
도포된 오일의 변화에 따른 Epoxy/EPDM 계면의 교류 절연파괴 특성에 관한 연구
배덕권,정일형,오재한,박우현,이기식,김충혁,이준웅,Bae, Deok-Gwon,Jeong, Il-Hyeong,O, Jae-Han,Park, U-Hyeon,Lee, Gi-Sik,Kim, Chung-Hyeok,Lee, Jun-Ung 대한전기학회 2000 전기학회논문지C Vol.54 No.12
Many successful developments and microscopic studies have been made on the high quality insulating materials. However, a little attention have given to the macroscopic interface in HV(High Voltage) insulating systems. In this study, AC interfacial breakdown strength and V-t characteristic of the interface between Epoxy/EPDM(ethylene propylene diene terpolymer) are investigated. Electrode system is designed to reduce the charges from electrodes and to have the tangential potentials along the interface between Epoxy/EPDM by FEM(finite elements method). The AC breakdown strength is observed when HV is given to the interface. It is shown that AC interfacial breakdown strength is improved by increasing interfacial pressure and oiling. In particular, it was saturated at certain interfacial pressure level. V-t characteristic is able to extend to the life time of the interface between Epoxy/EPDM. Oiling also plays a good roll in prolongation of the life time.
초고속 자기부상열차를 위한 초전도 반발식 자기부상 특성 해석
배덕권(Duck Kweon Bae),이종민(Jongmin Lee),조한욱(Han-Wook Cho),한형석(Hyung-Suk Han) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
This paper presents the numerical simulation results on the moving type electrodynamic suspension (EDS) simulator. Superconducting EDS system is generated by the interaction between the magnetic field made by the induced the eddy current in the ground conductor and the moving magnetic field made by onboard superconducting magnet. The levitation force of EDS system, which is proportional to the strength of the moving magnetic field, becomes saturated according to the increase of the velocity. Especially, the levitation force is influenced by the structure of HTS magnet and ground conductor. The 3-D numerical analysis with FEM was used to find the distribution of the magnetic field, the optimal coil structure, and the calculation of the levitation force.
배덕권(Duck Kweon Bae),김동훈(Dong-Hun Kim),박중신(Jung-Shin Park),이동영(Dong-Young Lee),이성일(Sung Ill Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.5
As modern industrialized society progresses, the demand for electric power is increasing rapidly. The electric power system is getting amazingly bigger and complicated, which can easily induce serious troubles from the potential of large fault problems and/or system failure. The monitoring and diagnosis of the electric machine for the fault detection and protection has been important part in the electric power system. Most faults in the generator appear in the winding. This paper presents the air-gap magnetic flux characteristic of a small-scale 2-pole synchronous generator according to the faults in the field winding to protect the generator from the fault. The magnetic flux patterns in air-gap of a generator under various fault conditions as well as a normal state are simulated by using finite element method. These results are successfully applied to the detection and diagnosis of the short-circuit condition in rotor windings of a high capacitor generator.