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- W2278216117 abstract "Modelling of partial discharge (PD) events allows a better understanding of the phenomena itself. In this work, an improved model representing PD behaviour within a spherical cavity in a homogeneous dielectric material has been developed to study the influence of cavity surface charge distribution on the electric field distribution in the cavity. Comparison of measurement and simulation results has been undertaken to validate the model. The model uses a two-dimensional axial symmetric Finite Element Analysis method, which is solved for local electric potentials. The model geometry consists of a homogenous dielectric material and a spherical cavity. The upper and lower cavity surfaces are divided into 10 boundaries each to model charge distribution along the cavity wall. Discharge is assumed to occur along the symmetry axis in the cavity. Once the discharge has passed through the cavity to the opposite surface, it is assumed that charge then propagates along the upper and lower cavity surfaces. Charge distribution is assumed symmetrical on the upper and lower cavity surfaces. During discharge, charge density increases on the cavity surface boundaries where charge propagates, until the field in the cavity centre is less than the extinction field. To model the charge movement along the cavity wall through conduction at other times, the change in the charge density on each cavity surface boundary is set as dependent on the cavity surface conductivity. Thus, cavity surface charge distribution will influence the electric field distribution in the cavity, affecting the likelihood of the next PD event." @default.
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- W2278216117 date "2011-04-13" @default.
- W2278216117 modified "2023-09-27" @default.
- W2278216117 title "The effect of spherical cavity surface charge distribution on the sequence of PD events" @default.
- W2278216117 hasPublicationYear "2011" @default.
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