Experimental Study On Influence Of Nanoparticle And Blending Modification On The DC Flashover Voltage Of Epoxy Resin

Epoxy resin is widely used in the area of high voltage insulation due to its excellent heat resistance and insulation characteristics.With the development of power system,grid voltage has risen and the operating environment has been more complex.The performance of epoxy resin is not enough to avoid flashover accidents.Therefore,it is necessary to improve insulation performance in order to ensure the reliability of the electrical devices by modification.This work focuses on the influence of nanoparticle and blending modification to the DC flashover voltage of epoxy resin.Firstly,a platform of making composite materials is created and then to establish the preparation processes.The bisphenol A epoxy resin is selected as the matrix,nano-SiO₂、nano-Al₂O₃ as fillers,and alicyclic epoxy resin as the blending resin.Secondly,nanoparticle modification of bisphenol A epoxy resin is made,then the influence of particle size,type,content of nanoparticles and coupling agent treatment on insulation performance is studied by the test of dielectric constant and DC flashover voltage.This experiment aims at studying the mechanism of nano filler in the micro environment and determining the optimal ratio of composite material under the nanoparticle modification.Finally,a blend modification system is prepared through using alicyclic epoxy resin to modify bisphenol and the effect of the blending ratio on the dielectric constant and the flashover voltage is studied.Then,bisphenol A epoxy resin is modified by nanoparticle and alicyclic epoxy resin.The influence of particle size,content and blending ratio on dielectric constant and flashover voltage is obtained and the mechanism of nano filler is analyzed.Based on the flashover voltage and the economy of the preparation of composite material,the optimal formulas of epoxy resin composite materials is determined under the combined action.This research can effectively promote the in-depth study of nanoparticles and blends,and provide reasonable references for the optimization design and comprehensive performance improvement of insulation.