As for the large transformer

the key equipment in power grid system

its seismic damage may cause huge social and economic losses. For evaluating the seismic economic effect of large transformer before and after seismic reinforcement

one 220 kV simulation transformer is taken as an example

the proposed seismic reinforcement method is verified through the seismic simulation shaking table test. The calculation model is used to perform seismic vulnerability analysis and also seismic economic effect assessment analysis of the large transformer. The results show that such seismic reinforcement methos as setting linkage between the turret and the transformer tank can reduce effectively the seismic responses level of the bushing and the probability of transformer failure. And the result of reducing probability of transformer traction failure is more remarkable. Adoption of seismic reinforcement measures can reduce effectively the seismic damage cost of transformer up to 50%. Compared with the economic effect of seismic reinforcement

the reinforcement modification cost is small and the seismic reinforcement measure has better seismic economic effects on large transformers.