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김종왕(Jong-Wang Kim),박훈양(Hun-Yang Park),이향범(Hyang-Beom Lee) 대한전기학회 2013 전기학회논문지 Vol.62 No.7
In this paper, the temperature distribution of 400kVA hybrid transformer is predicted by using CFD analysis. The copper loss and iron loss which are heat source are calculated by using Joule heat and Bertotti"s equation respectively. To improve the convergence of the numerical calculation and to reduce the computation time, the 1/4 model is used and the incompressible air model is used for external air. To verify analysis result, the temperature rise test and no-load test of the transformer are performed. The experiment result obtained by using thermo-graphic camera is similar to the numerical result of the CFD analysis.
인장 응력에 따른 자성체의 B-H Curve 특성 연구
김종왕(Jong-Wang Kim),김상현(Sang-Hyun Kim),양훈석(Hoon-Suk Yang),김지호(Ji-Ho Kim),정현주(Hyun-Ju Jung),이향범(Hyang-Beom Lee) 대한전기학회 2015 전기학회논문지 Vol.64 No.3
In this paper, study for B-H curve characteristics of the magnetic material due to tensile stresses of submarine for magnetic silence. For the experiment, made the sample of the material of AH36 and made to a B-H curve Tracer. In addition, design and made a system of stress by the weight in order to apply a tensile stress, it was possible to obtain results for the change of the magnetization.
김종왕(Jong-Wang Kim),김지호(Ji-Ho Kim),박현수(Hyun-Soo Park),정현주(Hyun-Ju Jung),이향범(Hyang-Beom Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.9
In this paper, for magnetic silence technology of naval vessel, is to make lab deperm system and to evaluate the deperm capacity of naval vessel regarding deperm protocol. Initial permanent magnetic field of naval vessel is magnetized before deperm, having the magnetic field of the same size, to evaluate the deperm capacity regarding a variety of deperm protocol for experimental reliability growth. Current dead time effect of deperm protocol is measured at the different initial current, which are 8A, 6A and 4A respectively. Furthermore, the experiment under the same condition except changing duty cycle into 50% is carried out. As a result, it is possible to compare the six different experiment outcomes. The result shows that the experiment with dead time improve the deperm capacity more than 48.51 percent comparing to the case without dead time.