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The influence of nanoparticles and homocharges on the propagation of electrical treeing in polymer insulation is examined for a needle-plane electrode arrangement. A simulation is carried out using a model based on Cellular Automata (CA). A DC voltage application on the needle electrode is assumed. Nanoparticles are introduced in the polymer matrix in the vicinity of the needle electrode, and simulations with different homocharge densities are performed. It is confirmed that the propagation of electrical trees is hindered by the presence of nanoparticles and homocharges. A larger quantity of homocharges forms a barrier to the injection of charge carriers in the nanocomposite sample. Electrical trees seem to go around and/or stop at nanoparticles and thus, their propagation becomes more difficult. In other words, the proposed simulations show that electrical trees follow a tortuous path, avoiding the nanoparticles.

Electrical Treeing Propagation in Nanocomposites and the Role of Nanofillers: Simulationwith the Aid of Cellular AutomataIn this paper the propagation of electrical treeing in nanodielectrics using the DIMET (Dielectric Inhomogeneity Model for Electrical Treeing) is studied. The DIMET is a model which simulates the growth of electrical treeing based on theory of Cellular Automata. Epoxy/glass nanocomposites are used as samples between a needle-plane electrode arrangement. The diameter of nanofillers is 100 nm. The electric treeing, which starts from the needle electrode, is examined. The treeing growth seems to be stopped by the nanofillers. The latter act as elementary barriers to the treeing propagation.

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The electrical tree propagation inside a solid insulating material is simulated in the present paper. The effect of a small insulating spherical particle inside the solid insulating material is investigated as far as the electrical field is concerned. Laplace's equation is solved inside the solid insulating material setting the boundary conditions around the spherical particle. An attempt for comparison between the simulation results and experimental data from the technical literature is being made, trying to shed light to the physical mechanisms that are involved in the phenomenon.