Study on Dynamic Characterization of Underground Substation under Soil‐structure‐equipment Interaction

Abstract Earthquake is one of the important causes of damage to underground substations. Underground substations are often equipped with many high‐voltage electrical equipment with large mass and uneven stiffness distribution, whose seismic performance is different from that of general underground structures, and the soil‐structure‐equipment interaction needs to be considered. In this paper, we analyzed the dynamic interaction mechanism of underground substation, and established a model of large‐scale underground substation considering soil‐structure‐equipment interaction through the ABAQUS. The natural vibration characteristics of underground substation system are analyzed by changing the location of electrical equipment, soil properties and the mass ratio of electrical equipment‐same‐floor main structure, and the interaction law of soil, structure and equipment is obtained. The results of the study can provide references and suggestions for the seismic design of the main plant structure of the underground substation.