Electrical testing of high voltage insulators reinforced with nano particles and its fractal analysis

The use of polymer insulators is expanding all over the world due to many advantages. It has been demonstrated that the reinforcement of a micro filled composite with nano fillers results in a composite more resistant to erosion from dry band arcing. The combination of micro particles and nano particles were used to develop a silicone rubber composite, and the new composite was used to manufacture several insulator prototypes. These prototypes and commercial insulators were evaluated in a salt fog chamber. In this paper the boxes counting method is used to determine the fractal dimension of a set of leakage current-time graphs, which were obtained during the salt fog evaluation of the developed insulators, in order to quantitatively define what the outstanding insulator is. To perform the analysis four types of freeware was used. Based on the analysis, determination, and comparison of the fractal dimension values; it was determined which of the insulators had a better performance in the salt fog chamber.