Abstract: : Aiming at the seismic performance of a 550 kV GIS composite bushing, the shaking table test and its finite element simulation analysis are conducted on its prototype structure. The shaking table is used to test the dynamic characteristics of the prototype and the response characteristics under the action of artificial seismic wave in different working conditions. The test results show that the dynamic amplification of the prototype structure under the action of artificial seismic wave is significant and the stress concentration at the root of the hollow composite insulator is obvious, which is the weak link in the structure. The finite element analysis software is used to carry out modal analysis and seismic time course analysis on the finite element model of the prototype structure. The analysis results show that the finite element simulation results are highly consistent with the test data of the shaking table, which verifies the accuracy and rationality of the finite element model. In addition, the effects of the support stiffness on the prototype upper structure under the seismic action are further explored. The results show that, with the increase in support stiffness, the acceleration at the top of the prototype first decreases, then increases, and finally decreases, while both the displacement at the top and the strain at the root of the composite insulator first increase and then decrease.

Key words: GIS composite bushing, seismic performance, shaking table test, finite element simulation analysis, support stiffness