• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.812-815
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• 1997

A dynamic model of air circuit breaker with a spring-actuated linkage is derived, and its validation for analysis and design, particularly appropriateness for an analysis of high-speed motion behavior are checked through experiments. The dynamic model is developed through the modeling process based on ADAMS and Pro/Engineer. The simulation results of derived dynamic models for the rapid closing and opening operations are compared with actual responses using a high-speed camera and investigated to validate their usefulness.

• NEWSLETTER 전기공업
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• no.99-24 s.241
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• pp.25-38
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• 1999

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.144-146
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• 2005

전기설비에 있어서 저압회로의 과전류 보호기기로는 배선용 차단기, 기중차단기, 한류퓨즈,전자개폐기 등이 있다. 배선용 차단기가 주 회로에 대한 과전류와 단락보호가 목적이라면 전자개폐기는 주 회로의 개폐, 즉 전동기 전원의 개폐를 주 목적으로 하므로 빈번하고 불규칙한 개폐동작에 의해 발생되는 Arc 에너지에 대해 전기적으로 내구 성능을 확보하는 것이 중요하다. 전기적 내구 성능은 수명과 품질을 결정하는 중요한 요인으로 관련업체에서는 전기적 내구성능을 향상시키기 위한 활동을 활발히 하고 있다. 성능 향상을 위해서는 시험규격에 적합한 시험회로와 설비구성을 통한 시험진행이 필수적이다. 여기서는 시험설비의 효율적인 활용을 통해 제품과 시험규격이 요구하는 여러 시험조건을 동시에 만족시켜 시험기간을 단축 할 수 있는 방안을 제시하고자 한다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.21 no.9
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• pp.78-84
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• 2022

An air circuit breaker (ACB) is an electrical protection device that interrupts abnormal fault currents that result from overloads or short circuits in a low-voltage power distribution line. The ACB consists of a main circuit part for current flow, mechanism part for the opening and closing operation of movable conductors, and arc-extinguishing part for arc extinction during the breaking operation. The driving mechanism of the ACB is a spring energy charging type. The faster the contact opening speed of the movable conductors during the opening process, the better the breaking performance. However, there is a disadvantage that the durability of mechanism decreases in inverse proportion to the use of a spring capable of accumulating high energy to configure the breaking speed faster. Therefore, to simultaneously satisfy the breaking performance and mechanical endurance of the ACB, its driving mechanism must be optimized. In this study, a dynamic model of the ACB was developed using the MDO(Mechanism Dynamics Option) module of CREO, which is widely used in multibody dynamics analysis. To improve the opening velocity, the Taguchi design method was applied to optimize the design parameters of an ACB with many linkages. In addition, to evaluate the improvement in the operating characteristics, the simulation and experimental results were compared with the MDO model and improved prototype sample, respectively.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.777-781
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• 1997

One of the spring-link mechanisms, the air circuit breaker(ACB), was studied to improve the shock-proof characteristics of it. The low-cycle fatigue fracture phenomenon was occurred on the critical link, called h-link, of ACB for the repeated rapid closing and opening operations. To analyze the cause of failure, dynamic FE-analysis on the h-link part of ACB was accomplished with considered the velocity and acceleration of the links per time as boundary conditions, which were obtained by using ADAMS. Then, to reduce the maximum tensile stress on the h-link, three types of h-link were suggested and one of them was selected. Fmm this study, we suggested the process of analysis on the high-speed motion behavior part related low-cycle fatigue fractures.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.666-669
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• 2005

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.