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CFD를 이용한 SF6 가스차단기의 SLF차단성능에 관한 수치적 연구
안희섭(Ahn Heui Sub),최종웅(Jongung Choi),박석원(Seokweon Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
A numerical model on the current interruption of SLF(Short Line Fault) is described in this paper. This modeling takes into account the turbulent effects and radiation of arc based on the LTE(Local Thermal Equilibrium) and LCE(Local Chemical Equibrium) assumptions. The arc conductivity and PAC(Post Arc Current) around the current zero is predicted and compared with test results.
노즐 용삭을 이용한 SF6 가스차단기의 압력상승에 관한 연구
안희섭(Heui-sub Ahn),정영우(Y.W. Jeong),최종웅(Jongung Choi),오일성(I.S Oh) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
CFX-based arc modelling of SF6 gas circuit breaker taking account of the effects of nozzle ablation and the mixing process of PTFE vapour with SF6 has been carried out for self-blast circuit breaker with a moving contact. An additional PTFE mass concentration equation is solved with the mass, momentum, and energy equation for the SF6-PTFE vapour mixture. Mesh deformation method has been employed to implement the moving contact. The thermodynamic and transport properties of SF6 and PTFE vapour are calculated by the minimization of the Gibbs free enthalpy and all properties of the mixture are interpolated linearly through the user subroutine program. The distributions of pressure, temperature, PTFE mass concentration and velocity are discussed during the whole arcing time. The predicted pressure and arc voltage are compared with the test results.
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.