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The shank regions of a polluted polymeric insulator are vulnerable to thermal damage from partial arcs. To alleviate this problem, it has recently been proposed to contour the polymeric surface with regular patterns of protuberances in order to reduce both the leakage current density and electric field strength in such regions, and by the same means to achieve an increase in creepage length. The performance...
The shank region of polluted polymeric insulators is susceptible to thermal damage where high current density and high electric field magnitude occurs. The recently proposed textured design consisting of hemispherical protuberances, aims to reduce the current density and the electric field gradient and increase the longitudinal creepage length without increasing the overall length of the insulator...
The established model of the flashover of an insulator, whose surface is covered with a moist, conducting layer of pollution, envisages that it develops from the formation and bridging of a dry band by a partial-arc pre-discharge. This pre-discharge is assumed to possess arc characteristics, so that the electric field across the dry band will fall as the partial arc current increases. Observations...
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