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박우진(W. J. Park),안길영(K. Y. Ahn),정광영(K. Y. Jeong) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The automatic load transfer switch (ALTS), a kind of electric power switch, typically automatically transfers electrical loads from a normal electrical power source to an emergency electrical power source upon reduction or loss of normal power source voltage. It can also automatically re-transfer the load to the normal power source when the normal voltage has been restored within acceptable limits. The transfer operation of ALTS is accomplished by a spring-driven linkage mechanism. In order to control or delay the transfer switching time, the ALTS studied in this paper uses the superposed leaf springs, which are subjected to impact loadings in contacting with electrical contacts. Therefore, to confirm whether the springs has enough mechanical endurance in ALTS, we build a finite element model of the superposed leaf springs using LS-DYNA and perform the impact and fatigue analysis.
ANSYS 를 이용한 전기 접촉 기구의 전자 반발력 분석 및 온도 상승 예측
박우진(W. J. Park),김기환(K. H. Kim),안길영(K. Y. Ahn),오일성(I. S. Oh) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
As computer power increased, the system with complex phenomenon has been analyzed with the help of CAE software which can handle the coupled physics, such as electromagnetic, structure, thermal and fluid physics. To predict the electromagnetic repulsion force and the temperature distribution of an air circuit breaker with electric contact mechanism, ANSYS/EMAG, FLOTRAN can be used. Although some assumptions and simplifications were introduced to simulate the model, results from the computational model were in good agreement with actual measurements obtained from experiments.
박우진(W.J. PARK),안길영(K.Y. AHN),양홍익(H.I. YANG) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Vacuum interrupters are now widely used for medium voltage switching up to 38kV in such applications as metal-clad switchgears, circuit breakers, etc. Vacuum interrupter minimizes the damage and loss of the contact electrodes, in breaking an interrupting current, due to its quick vacuum insulation recovery characteristics. The fixed and moving electrodes of vacuum interrupter are mated by a driving mechanism within several milliseconds. Therefore, rebound phenomena could occur between the electrodes due to considerable impact forces. Because such impact forces could cause structural damages to vacuum interrupters and shorten the fatigue-life of the electrodes, an impact analysis becomes a very important method to investigate the dynamic behavior of the vacuum interrupter. In this paper, the dynamic characteristics of electrodes are analyzed based on the derived dynamic material properties and impact analysis is carried out with explicit finite element method. To predict mechanical safe-life of a vacuum interrupter of axial type through impact analysis, the S-N curve of the materials is obtained by fatigue experiments.