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2.5 MJ 고온초전도 SMES용 열 전도판의 와전류 손실 해석
이세연(S. Lee),박상호(S.H. Park),이지광(J.K. Lee),이상진(S.J. Lee),김우석(W.S. Kim),배준한(J.H. Bae),성기철(K.C. Seong),최경달(K. Choi),한송엽(S. Hahn) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
본 논문에서는 전도냉각형 2.5 MJ 고온 초전도 SMES(Superconducting Magnetic Energy Storage System)용 열 전도판의 와전류 손실 해석결과를 나타내었다. SMES의 운전 상태는 크게 충전, 저장, 방전의 3가지 구간으로 나눌 수 있다. 이 중 에너지의 충전과 방전 시에는 SMES의 초전도 코일에 전류 변화가 발생하기 때문에 코일과 인접하게 설치된 열전도판에 와전류가 발생하게 된다. 이러한 와전류 손실은 냉각장치의 부하로 작용하게 되어 SMES 시스템의 효율과 안정성을 높이기 위해 설계 시 반드시 고려되어야 하는 부분이다. 따라서 본 논문에서는 이러한 방전 조건에서의 열전도판에 발생하는 와전류 손실을 해석하고, 열전도판의 형상변화에 따른 와전류 손실 결과에 대해 검토하였다.
Design of Superconducting Magnets for a 600 kJ SMES
박명진,곽상엽,이승욱,김우석,한승용,최경달,한진호,이지광,정현교,성기철,한송엽,Park, M.J.,Kwak, S.Y.,Lee, S.W.,Kim, W.S.,Hahn, S.Y.,Choi, K.D.,Han, J.H.,Lee, J.K.,Jung, H.K.,Seong, K.C.,Hahn, S.Y. The Korean Superconductivity Society 2006 Progress in superconductivity Vol.8 No.1
The design of superconducting magnets for a 600 kJ SEMS was discussed. The basic constraint conditions in the design of a 600 kJ SMES magnet were V-I loss(<1 W), inductance of magnet(<24 H), the number of Double Pancake Coils(DPC about 10), the number of turns of DPC(<300), outer diameter of DPC(close to 800 mm) and total length of HTS wire in a DPC(<500 m). As a result of optimum design, we obtained design parameters of the 600 kJ SMES magnet with two operating currents, 360 A and 370 A, which are in the limited conditions without V-I loss. V-I loss of each operating current was calculated with design parameters and V-I characteristic of the HTS wire. As a result of calculations, V-I losses with operating currents of 360 A and 370 A were 0.6 W and 1.86 W, respectively. Even though all design parameters of the SMES magnet in case of operating current of 360 A were in the restricted conditions, V-I loss of SMES magnet showed a tendency to generate at local DPCs, which are located on the top and the bottom of the SMES magnet more than that of the other DPCs.
장성만(S. M. Jang),김석환(S. W. Kim),한송엽(S. Y. Hahn),정현교(H. K. Jung) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
This paper describes the energy and speed characteristics of an induction coil-gun. The coil-gun has some merits that it can be easily installed and repeatedly used many times, it does not damage mechanically in the course of launch and the force exerted on the projectile is distributed uniformly. An equivalent circuit is employed for modeling the coil-gun. The circuit equations and equation of motion are then derived based on the equivalent circuit. These equations are solved numerically by using Runge-Kutta method. Finally the energy transfer ratios are obtained according to the variations of the resonant frequency of driving circuit and charging voltage of capacitors. The muzzle velocities of projectile are also obtained according to the variations of electrical conductivity and initial position of projectile, firing angle of driving circuit, charging voltage of capacitor and resistance of driving coil, respectively.