Effect of the Shape of the Insulator on Fractal Characteristics of Creeping Discharges

Fractal characteristics of creeping discharges propagating on nano-epoxy composite insulators immersed in coconut oil

“…Needle plane electrode systems are usually selected to experimentally investigate the creeping discharge development (Kebbabi & Beroual, 2006;Dang et al, 2012). The tangential field component of the divergent electric field drives the propagation of creeping discharge as observed inside actual high voltage apparatus (Ediriweera et al, 2018a).…”

“…The test cell has a point-plane electrode arrangement, where the vertical point electrode is held using a movable bearing system to permit vertical movement. The point electrode, made of tungsten, has a diameter of 1 mm and the tip of the point is hemispherical so that the field between the two electrodes would be divergent (Ediriweera et al, 2018a). The gap between the two electrodes can be varied from zero to 20 mm.…”

“…As a parameter of characterization of a complex degree of natural phenomena, a fractal dimension is used to describe the surface topography of a fracture and to give a quantitative value to each pattern (Zhou et al, 2014). Several methods can be adapted to calculate the fractal dimension of creeping discharges (Beroual et al, 2014;Ediriweera et al, 2018a). In the current study, the box-counting method was used.…”

“…The failure of critical oil-filled high voltage (HV) equipment such as cables, transformers, capacitors, and circuit breakers with many solid/liquid interfaces may lead to catastrophic events, resulting in economic losses and injury to humans. Therefore, it is important for the power utilities to reliably operate and maintain their high voltage equipment (Kebbabi & Beroual, 2006;Ediriweera et al, 2018a). Dielectric liquids are used in the power industry together with solid insulating material to serve as an insulation, impregnation, and cooling medium.…”

Investigation of oil level and type of solid insulator on creeping discharges propagating under an ac electric field

“…Failure of high voltage equipment leads to catastrophic events, resulting in economic losses and injury to humans. Therefore, power utilities are putting their maximum effort to maintain high voltage assets with a reliable operation (Beroual & Boubakeur, 1991;Kebbabi & Beroual, 2006;Ediriweera et al, 2018). Solid/liquid or solid/gas interfaces can be seen in oil or gas-filled high voltage equipment such as power transformers, capacitors, bushings, and circuit breakers.…”