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Partial discharge (PD) is a major problem in high voltage (HV) insulation that it can lead to electrical degradation and ultimate failure of the insulation materials. Recent research found that with the use of nanoparticles, the correct combination of nanofiller with resin will enhance the electrical, mechanical and thermal properties of HV insulation. Boron nitride (BN) is a ceramic dielectric material,...
The hydrophobicity on surface of insulator material in outdoor is very important. In humid and the rainy conditions, the insulator surface must not easily wet, so that the surface conductivity of insulators remain low, thus the surface leakage current is very small. Therefore the polymeric insulator must be hydrophobic and withstand against environmental conditions. This paper presents the effect...
Under conditions of high temperature and high humidity, the moisture absorbing behavior of epoxy resin SUR-2 casting matrix for composite core was investigated, and the variation of the mechanical properties and the heat deformation temperature with hygrothermal aging were researched, The results show that the moisture-absorption behavior of the casting resin followed the Fick law. The mechanical...
In recent times, there has been increased awareness of the fact that space charge within an insulating material considerably governs its dielectric behaviour. In this work, we study the nature of space charge trapping and detrapping in epoxy specimens, with and without nano sized fillers. After application of a poling field for a specific period of time, depolarisation characteristics are obtained...
We have applied infrared, Raman and UV-VIS spectroscopy to measure spatially resolved chemical composition and structure of cross-linked polyethylene insulated cables used in the EC-funded Artemis project, both before and after electrical and thermal stressing. The work shows that diffusion of the primary products of chemical crosslinking changes the quasi-parabolic concentration radial profile present...
Insufficient long term reliability of internal interfaces in polymeric outdoor insulators is considered as a potentially critical factor in the performance of modern outdoor insulation systems. In this study, aiming to elucidate this question, test objects composed of silicone rubber layers moulded onto plates of epoxy resin were tested. The epoxy substrate was incompletely covered by a bonding primer...
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