Study on Vibration Isolation Design Analysis of 500 kV Indoor Substation

In order to study the applicability of isolation technology for indoor substations, this paper establishes a numerical prototype and isolation structure simulation model of a 500 kV indoor substation building structure by using finite element software. Modal analysis and seismic response analysis are carried out to study the dynamic characteristics and seismic response rules of the building for the prototype and isolation structure. The numerical simulation results show that the higher the floor, the more significant the amplification of the acceleration response, and the acceleration response amplification coefficients of the second and third floors are greater than the 2.0 required by the code. The transverse shear force of the first column is reduced by 78%, the acceleration response of the second and above floors is reduced by 80%, and the seismic fortification intensity of the second and above electrical equipment can be reduced by one degree. The maximum displacement of the isolation bearing is 310.32 mm, which is smaller than the limiting displacement of the minimum type of isolation bearing, which is 330 mm. The performance of the isolation bearing is in the safe and stable region, and the isolation design scheme is more reasonable. Compared with the prototype structure, the isolation design scheme significantly reduces the inter-story displacement of each floor, and the concrete frame of the isolation structure is in the elastic region under the earthquake action, which improves the seismic performance of the building and electrical equipment.