Seismic response analysis of ±800kV firewall-electrical equipment interconnected system

In order to study the seismic response characteristics of firewall and upper connected electrical equipment system in ±800kV converter station, the finite element models of 500kV composite arrester and 500kV composite post insulator single equipment, connected equipment and firewall-connected equipment system are established respectively. Then, the seismic response analysis under different seismic input is carried out. Finally, the influence of rigid bus on seismic response of single equipment is analyzed and the dynamic amplification effect of firewall on the upper equipment. The results show that the acceleration, compared with single equipment, displacement and stress response of the connected equipment connected by sliding fittings and rigid bus are reduced to varying degrees, and safety factor of the composite bushing is far greater than 1.67 under 0.4g seismic input, so the seismic performance is superior. The firewall has a great dynamic amplification effect on the upper connected equipment. In the vertical direction of the wall, the acceleration amplification factor of the firewall itself is 3.63, and the acceleration amplification factor of the firewall to the connected equipment is 2.15; Peak stress of upper connected equipment is 103.96 MPa, and the safety factor is 1.16, which is less than the limit of domestic codes. The layout of the firewall is extremely unfavorable to the seismic performance of the upper connected equipment in the vertical direction of the wall. Therefore, the measures of shock-absorption and reinforcement of the upper equipment or the structural modification design of the firewall can be carried out.