Seismic Analysis And Isolation Design Of Electric Power Facilities Of A Substation In Longnan

Electric power engineering is one of the important lifeline projects,its requirements for safety performance are obviously different from those of ordinary buildings,electric power construction and power facilities should possess the anti-seismic capability,under the action of an earthquake, it is necessary to ensure that the work can be continued and the power supply can be guaranteed,in order to facilitate the smooth development of disaster relief work and to provide power protection for other rescue systems,Longnan is in an earthquake prone area,the effective defense against earthquake disaster is an important issue for Longnan electric power.This paper takes the SF330 kV substation infrastructure in Longnan as the object of study,the seismic performance of electrical equipment is discussed and analyzed,measures to improve the anti-seismic level of electrical equipment are put forward;according to the design concept of using seismic characteristics of building to ensure the seismic demand of indoor electrical equipment,the main control communication room of Longnan SF330 kV substation is taken as the research object,the design objectives and principles of building seismic design are established, the basic isolation design is adopted in this project, seven ground motion data are selected according to engineering practice, the seismic analysis and design are carried out by using SAP2000 finite element analysis software,the calculation results meet the preset requirements of seismic target.Through the comparison and analysis of the seismic response data of the main control room with the isolation design and the unseismic structure,it can be seen that after adopting the isolation design, the self-vibration period of the main control communication room of the SF330 kV substation is significantly reduced, the base shear force, the interlayer displacement angle and the interlayer acceleration decrease remarkably,the roof acceleration decreased by 75%,ground floor acceleration decreased by 60%,so that all seismic indexes can meet the requirements of relevant codes,the expected seismic design target has been achieved.At the same time, the response analysis of building isolation structure and non-isolated structure is carried out,the seismic isolation layer can obviously reduce the energy transferred to the superstructure,energy consumption effect is remarkable,the structure did not enter the stage of plastic energy dissipation,the interlayer deformation and internal force of the isolation structure are greatly reduced,the structure is close to rigid translation.The isolation device effectively reduces the damage degree of the indoor electrical equipment while ensuring the safety of the structure,it played a better role in protecting the safety of power construction and electrical equipment,the designed seismic design target has been achieved,the isolation effect of this structure is remarkable,the design of engineering isolation is reasonable.The study shows that the power building is designed after seismic isolation design,it can protect the building structure and the safety of electrical equipment well,it has certain reference value for popularizing the seismic isolation technology in the large-scale engineering application of Longnan electric power field.