고압회로 차단기의 성능개선을 위한 조작기 설계에 관한 연구

Abstract

The electricity is inseparable from our lives. The supply of electricity in our lives plays an important role for enhanced convenience. Accordingly, it is also important to control electricity. The circuit breaker is a device that automatically and quickly shut off the circuit when an accident such as over-current, short circuit occurred in the process of supplying electricity. For this reason, the breaking time is important characteristics of performance on the circuit breaker. The breaking time is composed of the arc extinguishing time and the opening time. The arc extinguishing time is affected by the arc extinction medium and the opening time is affected by the structure of operating mechanism. Generally, the operating mechanism in the high-voltage circuit breaker is made up the several lathes. Especially, the geometry and relative position of latches have an effect on the dynamic behaviors of operating mechanism. In this study, the three-stage latch operating mechanism is analyzed based on verified the multi-body dynamic model that is established by using the MSC/ADAMS program. The analysis of mechanism draw a conclusion which have eight design variables. The design variables are defined as the relative position and length of latch. The important five design variables were selected by analysis of Design of Experiments(DOE). Due to this, optimum design is carried out by using the Genetic Algorithms(GA) of VisualDOC program. According to this result, the opening time is reduced by 2.7ms. It means that the performance of circuit breaker is improved about 22.5%.