Simulation and Analysis of Seismic Performance of Mechanical DC Circuit Breaker Based on Time History Analysis

Mechanical DC circuit breakers are prone to failure under the action of earthquakes, and their seismic performance needs to be studied in depth. In this paper, 160kV mechanical DC circuit breaker is used as the research object, and the time history analysis method is used to study its seismic performance under 9.0 fortification intensity earthquake. Firstly, according to the seismic design specifications of power facilities, three kinds of seismic waves were selected, and then the seismic performance of mechanical DC circuit breakers under three different seismic wave inputs was simulated and calculated, and the stress cloud map of mechanical DC circuit breakers was obtained. The results show that the existing design of 160kV mechanical DC circuit breaker meets the seismic strength requirements under the seismic excitation of 9 magnitude fortification intensity. Compared with EI-Centro seismic wave, Wenchuan wave has greater damage to circuit breaker structure.