Fluid influence on dynamic characteristics of transformer-bushing system using fluid structure interaction (FSI) approach

Currently used procedures for seismic qualifications of HV bushings are based on the analytical equations, and very often are verified by shake table tests. As many specialists claim this approach does not fully reflect the real behavior of the bushing coupled with the transformer tank during seismic loads. In the paper a new methodology for seismic analysis of the transformer/bushing system has been presented using complex numerical simulations. In the proposed approach Fluid Structure Interaction is involved. The methodology has been experimentally verified and can provide useful information for proper design of transformer tank and bushings with high resistance to seismic loads.