Analysis Of Seismic Response Of Composite Material Transformer

In recent years,China has entered an active period of earthquakes,and highmagnitude earthquakes have occurred frequently,resulting in the destruction and interruption of power grids in high-intensity areas in China.This places higher demands on the seismic performance of power facilities.UHV power grids have become the main power facilities for long-distance power transmission due to their excellent electrical performance.Transformer as an important equipment in the substation,due to its "high,large,heavy,soft" feature,resulting in its high vulnerability to earthquakes.Thanks to the research results of materials science,it was found that composite materials have the advantages of light weight,high strength,and high insulation.In recent years,electrical equipment such as surge arresters and circuit breakers made of composite materials have been partially used in low-grade substations.However,at present,there are relatively few researches on the characteristics of UHV composite transformer used in our country,and the research mainly focuses on the electric power test.Therefore,it is of great significance to conduct research on the seismic test of UHV composite transformers in China.Firstly,this paper conducts a pseudo-static test on the composite material transformer equipment produced by a certain factory.The hysteresis curve and skeleton curve of the specimen obtained by the experiment are fitted to the restoring force model of the plastic assembly section.At the same time,the restoring force characteristics of this equipment are analyzed including parameters such as stiffness,strength degradation,and energy dissipation performance.Then the test piece was subjected to a shaking table test,and its excitation frequency and damping ratio were measured by excitation with white noise.It was found that the first-order frequency of the equipment was within the seismic excellent frequency range,and therefore the equipment had high seismic vulnerability.Subsequently,the specimens were excited by seismic waves of different levels of peak acceleration and artificial time-history waves,and the different mechanical responses were measured.The results show that the dynamic responses of the specimens under different seismic waves differ greatly.By analyzing the spectrum and response spectrum of the seismic wave,it is found that the spectrum envelope of the artificial time-wave is good and the stability of the equipment is good.It is found that under the action of the earthquake,the displacement response of the top of the equipment is relatively large,and the maximum displacement angle is about 1/50.Therefore,it should be considered when using it to increase the traction length of the busbar to prevent the equipment from being damaged due to the involvement of the busbars in the earthquake.Finally,the non-linear spring element in the ANSYS finite element software library was used to simulate the fitting section of the test piece.The model was subjected to pseudo-static test and numerical calculation of the dynamic time history.The calculation results showed that the simulation was performed by using the nonlinear spring element.The three-fold line restoring force model can better simulate the dynamic response of the equipment in the earthquake.Vibration tests of this type of structure can be replaced by finite element calculations.The research results of this paper can provide reference for the restoring force characteristics and dynamic response analysis of composite material transformer equipment.Promote the promotion and application of this equipment in the construction of UHV power grids.