Effect of the Shape of the Cross Section of the Solid Insulators Immersed in Coconut Oil on the Area and the Dimension of Creeping Discharge Propagation

The present paper is aimed at the use of solid material samples with square and circular uniform cross-section for analyzing fractal characteristics of creeping discharges propagating over solid/liquid interfaces under alternating current voltages. Considered solid insulating samples are made of glass and acrylic materials. A test set up based on a point-plane electrode arrangement is used to initiate creeping discharge in a laboratory environment. These configurations are used to analyze the effect of the shape of the cross section of the solid material on the fractal dimension calculated by box counting method and the area of the discharge patterns. Results show that the shape of the cross section of the solid dielectric material does not have a significant effect on the fractal dimension. However, it affects the area of the discharge patterns.