Reactor is an important electrical equipment in ultra-high voltage substations

and the main failure mode in earthquake is the fracture of the porcelain bushing root or the relative displacement of the body with respect to the foundation. In order to reasonably evaluate the seismic performance of ultra-high voltage reactor equipment and verify the effectiveness of seismic isolation technology in improving structural seismic performance

this paper studies the changes of the acceleration

displacement

and strain response of the bushing under different levels of seismic waves through the shaking table test of the scaled-down reactor-bushing system model. Based on the probability theory

the probability distribution curve of the dynamic amplification coefficient of UHV reactor equipment under different seismic wave sets and the seismic vulnerability curve before and after using the isolator are proposed by numerical simulation analysis. The influence of various seismic waves on casing strain and isolator displacement is studied to assess seismic vulnerability. The stiffness analysis shows that the elevated seat is relatively flexible

which obviously amplifies the seismic response of the casing. The isolation device reduces the maximum strain response of the casing by more than 50%

while increases the displacement of the top of the casing

which should be considered when the casing is connected with other electrical equipment. The probability distribution of the casing stress amplification coefficient under different site types of seismic waves has been given. The application of the isolator reduces the seismic vulnerability of the reactor

while the pulse-type seismic wave has a great influence on the displacement response of the isolator.