The Hazard of Electric Field Increment in the Damaged Silicon-Rubber and Porcelain Insulators

Abstract

 In power transmission lines, there is a need to insulate the underlying voltage parts from each other and zero potential. By definition, an insulator is said to have a high electrical insulation between the conductors and the retaining racks. Insulators, in addition allow the mechanical conduction of the conductor and the ground. The presence of a broken insulator can change the voltage distribution. In this paper, the effect of mechanical insulation fracture (fluttering) on the electric field and electric potential distribution models, on two common types of insulators (porcelain and silicon-rubber), will be analyzed. First, the electric field and electric potential patterns on the solid insulator will be examined. In continuing the insulator is considered to be broken and the electric field and electric potential patterns for the broken insulator corresponding to the basic insulator shape are specified and compared. The results show that the presence of insulating fracture in dry and non-polluting conditions affects the voltage distribution pattern inside and around the insulator. Finally, a comparison between the impact of the fracture on the electric field and the potential distribution patterns on the different parts of the insulator will be discussed in detail.