고압회로 차단기의 동적성능 예측을 위한 스프링 조작기의 특성 실험 및 해석

Abstract

Since the performance of the circuit breaker mainly depends on the spring operating mechanism, an analysis of the spring operating mechanism is required for advanced designs. The spring, especially the closing spring, stores the deformation energy due to compression and then accelerates the load rapidly within the circuit breaker. To carry out a kinematic and dynamic analysis of the circuit breaker. An accurate modeling of the spring behavior is required. In this thesis, the static stiffness of the spring was captured by using a material testing machine. Sine-wave excitation tests based on several amplitudes were performed to find out the spring characteristics. Then, The test results were used to make the spring model for the computer simulation. Three types of spring models such as a linear spring model, a modal spring model, and a nodal spring model were made and compared to the experimental results. Numerical results were also compared to the experimental results, according to the numerical accuracy and efficiency. In this thesis, a simple mechanism similar to the spring operating mechanism was designed to generate the release motion of the spring. A high speed camera was used to capture the behavior of the spring. The release simulation results were compared to the experimental results. Finally, a circuit breaker simulation was carried out to compare the performances of the spring models.