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Water absorption behavior of disk-like mineral filled epoxy resin insulators is determined by measuring the change of weight at different relative air humidity. Bulk current measurements with epoxy resin samples which have reached their absorption equilibrium during storage at various relative humidity are carried out and a significant decrease of the volume resistivity is observed with increasing...
Pulsed electroacoustic (PEA) method was applied as a nondestructive method to detect electrochemical migration in a sheet of epoxy resin and a sheet of laminate consisting of the same resin and a paper/phenol-resin composite. A significant decrease in the amount of negative charge was observed at the interface between the resin and the composite when the sample was the laminate. This is assumed to...
This paper contains examinations concerning the conducting behavior of pure epoxy resin in time and frequency domain First, time resolved current measurements are presented to analyze the behavior in time domain experimentally. The conducting behavior is recorded in dependence of temperature and applied DC-voltage. Based on the experimental examinations an equivalent circuit diagram is developed which...
Effects of addition of micro-sized silica fillers and/or nano-sized clay fillers into epoxy resin on its dielectric properties were examined. The glass transition intermediate temperature (Tg) was found to show a decrease by the addition of a small amount of nanofillers, while it is increased by the addition of abundant microfillers with and without co-addition of a small amount of nanofillers. At...
With the tendency towards higher power, higher capacity and less scale of the pulsed-power devices, the vacuum surface flashover strength turns to be a primary limitation of the development of the pulsed-power equipments, as it is much lower than the vacuum breakdown strength. To improve the different capabilities of the epoxy composite material, different kinds of micron inorganics are filled to...
V.P.I. is the most advanced impregnation technology for the electrical machines that have been developed. With the rapid development of the electrical industry, demands of improving the properties of V.P.I. resins become higher and higher. It is of practical significance to investigate the effect of the modification of the epoxy resin TMPTMA on the cross-linking structure, the DC electrical resistivity...
In this essay the DC resistivity and high field conductive properties of nano metal/polymer composite are studied. It shows that if adding little small-sized Ag particles, the resistivity of composite increased obviously in comparison with pure epoxy resin, and the increasing of resistivity is related to the size and content of Ag particles, and the performance of polymer. High field conductive property...
The aim of this study is to investigate the influence of temperature on the mechanical and insulation properties of a newly developed epoxy-layered silicate nanocomposite. This nanocomposite has a higher thermal resistance with respect to mechanical properties than a base epoxy resin (epoxy resin without fillers). The volume resistivity of the nanocomposite gradually decreases with increasing temperature,...
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