Nanostructures study on power transformer insulation paper under electrical and thermal stresses

In this paper, in order to analysis the nanostructures varieties and ageing mechanism of power transformer insulation paper under electrical and thermal stresses, both Atomic Force Microscope and MS 4.0 software were used to analysis the microscopic figure variation of insulation paper during thermal and electrical ageing. The results indicate that in some parts, paper sample was punctured because of the flow of discharge current which destroyed the compact cellulose chains structures and the diameter of punctures is about 0.5 nm. In addition, this paper analyzed the influence to the physical chemistry characteristics of insulation paper caused by partial discharge and paper ageing.