Performance Analysis of Chopped Fiber Composite Meta-Nano-Aramid IP for Transformer Bushings and to Analyze Environmental Impact

Abstract

To study the effect of nano-SiO2 doping content on the properties of chopped fiber composite meta-nano-aramid insulating paper (IP) for transformer bushings, the laboratory-prepared chopped fiber composite meta-nano-aramid IP with different nano-SiO2 doping content is analyzed to assess its impact on the environment. The study has been carried out by considering crystallographic properties and morphology of chopped fiber composite meta-nano-aramid fiber, the influence-mechanism of nano-SiO2 doping content on the mechanical properties, the thermal stability and insulating properties of aramid paper. The experimental results show that the appropriate graft modification of nano-SiO2 enhances the thermal stability and mechanical properties of the meta-aramid (MA) insulating paper. It also shows lesser carbon emissions. When the results are compared with SiO2 without grafted silane coupling agent, SiO2 with a surface graft ratio of 6%, the former method (SiO2 without grafted silane coupling agent) shows a greater increase in the glass transition temperature of the MAIP. At the same time, it shows weakened molecular weight in terms of MSD. The proposed method shows more prominence in terms of the chain kinematic ability, the resistance to deformation, and shearing in terms of mechanical properties. When SiO2 with the graft ratio of 12% is observed, it does not show any improvement, and also the effects on thermal stability and mechanical properties of IP are not significant which is similar to grafting. After hot pressing at 245°C, 30 MPa for 5 min, the breakdown strength, and volume resistivity can reach as high as 37 kV/mm and 1.34 × 1015 Ω·cm respectively. The proposed method shows a significant environmental impact in terms of less emission of CO and CO2.