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Space charge effects in two different types of thermally aged oil-paper which are traditional mineral oil and synthetic ester MIDEL 7131 immersed paper, were tested and compared. The results show that a few days standing time between the ageing processes and following experiments are necessary to achieve water equilibrium. With thermal ageing conducted, more charges were injected into the oil-paper...
In this paper, a set of accelerate thermal ageing experiments on oil immersed insulation paper were performed under 110□ and lasted for more than 100 days. The degree of polymerization (DP), the frequency domain spectroscopy (FDS) and water concentration in insulating oil and paper, as well as the AC breakdown voltage of insulation paper were tested and analyzed. The results indicate that the dielectric...
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...
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