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열-전ㆍ자계 연성해석을 이용한 초고압 모선부의 온도상승 해석
안희섭(Heui-Sub Ahn),윤정훈(Yoon Jeong Hoon),최종웅(Jongung Choi),오일성(I.S.Oh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In development of High-voltage switchgear, proper thermal design becomes more and more important to provide safe function and reliability in spite of miniaturization and increasing performance demanded of modern devices. Due to the high complexity of heat generation and loss processes it is not easy to predict the thermal behavior of devices under various load conditions, i.e. usually numerous tests are required. To estimate the thermal performance of main bus, the 3D sequential coupled field thermal-magneto model was developed. The solution of the heat generation rate due to applied and eddy currents as well as skin and proximity effect is obtained using commercial electro-magnetic package. The solution for the fluid and temperature distribution is also obtained using commercial CFD package. The results of electromagnetic analysis are the inputs to the CFD analysis and vice versa until the steady state is reached. Temperature dependent material properties for both types of analyses are considered during the solution process. The predicted temperatures are quite well agreed with the experiments.
평판스프링을 가진 열동형 과부하 릴레이 메커니즘의 모델링 및 동적해석
안길영(K. Y. Ahn),정원선(W. S. Chung),오일성(I. S. Oh),신봉수(B. S. Shin),오승우(S. W. Oh),강병덕(B. D. Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A thermal overload relay is a device that transmits the off signal to the magnetic contactor before an<br/> electric motor or machine is damaged due to over current. Such a relay generally uses a reversal mechanism<br/> to change rapidly the steady state into the configuration for transmitting the off signal. Here, the mechanism<br/> consists of a flexible flat spring and coil spring. Also, in such a relay, the bimetal used to compensate for the<br/> effect of surrounding temperature acts like a flat spring. In this paper, the dynamic behavior of the relay<br/> mechanism with a reversal mechanism is modeled and analyzed using ADAMS. The flexible flat spring is<br/> modeled using a beam element and its model is verified through the free vibration experiment of the spring.<br/> Comparing the simulation results of the relay with experimental responses, the derived dynamic model is<br/> verified.
몰드 디자인과 냉각조건이 Bi2212 초전도튜브에 미치는 영향
이남일,장건익,오일성,박권배,Lee, N.I.,Jang, G.E.,Oh, I.S.,Park, K.B. 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1
For the practical application on SCFCL(Superconducting fault current limiters), Bi-2212 tubes were fabricated by Centrifugal Forming Process(CFP). The tubes were annealed at 830, 840, $850^{\circ}C$, respectively for 80 hours in oxygen atmosphere. The tubes heat treated at $840^{\circ}C$ demonstrated better electric characteristics than the tubes heat treated at 830 and $850^{\circ}C$. The typical value measured at 77 K in the self field was around 556 A. In terms of cooling effect on superconducting properties, it was found the electrical properties were quite dependent on the mold design and shapes. In order to check uniformity along the tube, EFDLab fur heat and fluid analysis of NIKA was adopted. It was found out that the simulation data was quite well matched with experimental results.