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Electrical treeing in pure LDPE and in three LDPE nanocomposites, filled with fibrous and laminar philosilicates, has been studied. The nanocomposites have been prepared by dispersing into the matrix 10% wt of nano fillers having different aspect ratio: sepiolite, montmorillonite and also sepiolite and montmorillonite together. Both considered nanofillers have been organically modified in order to...
This work deals with the inception and the growth of electrical treeing inside different Low Density Polyethylene (LDPE) nanocomposites. Two nanoflllers were adopted: sepiolite and montmorillonite. Both nanoflllers belong to the family of silicate clay minerals but have different aspect ratio. The nanocomposites have been prepared by melt dispersion of sepiolite, montmorillonite and a mixture of both...
The present experimental work focuses on the growth of electrical treeing inside different Ethylene-vinyl acetate (EVA) nanocomposites containing Bohemite (an aluminum oxide hydroxide) and Montmorillonite (a phyllosilicate clay mineral) nanoparticles. Bohemite and Montmorillonite particles have different aspect ratios: the first one has a nanometric cube-like symmetry, while the latter has a typical...
This paper presents a preliminary experimental activity aimed at investigating the behavior of low density poly ethylene (LDPE) nanocomposites in presence of electrical treeing. The outcome evidences an enhancement of the resistance to tree growth in the nanostructured compound containing intercalated montmorillonite.
This work is aimed at investigating the effect of voltage harmonics on electrical treeing inside cross linked polyethylene (XLPE). The study focus on the partial discharge (PD) activity associated to electrical treeing, which changes with the harmonic content of the supplied voltage. Different frequency components have been superimposed to a sinusoidal basic waveform and have been applied to suitable...
This work deals with the growth of electrical treeing in different EVA-layered silicate nanostructured compounds. The experimental activity evidenced that the intercalated nanocomposites have longer lifetimes than pure EVA under the same constant AC stress conditions. A monitoring of the tree growth morphology allowed to evidence very interesting features of the intercalated nanocompounds showing...
Electrical treeing in polymeric insulation is potentially a nano-structure dependent phenomenon. The present work is part of a preliminary study on electrical treeing in EVA-layered silicate nanocomposites having different morphology. Two parameters have been mainly considered: the treeing inception voltage (TIV) and the breakdown voltage (BDV). These parameters, especially the TIV, have shown a significant...
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