Vol. 3, Issue 1, Part A (2021)

In this paper, the results of tests on sixteen different composites materials insulators samples were presented. The results shows, that the grain size of composite materials affected the loss factor (Tan δ) of the insulators, (Tan δ) decreased with the decreasing in grain size and increased as the applied voltage increased. The capacitance C [F] of insulators decreased as the frequency increased and it's increased as the insulator length increased. Also the results show that the high percentages of raisin and Portland cement in composite insulators decreased. The paper presents results of the laboratory tests performed on polymeric insulators with and without bio contamination. It was observed that there is no effect of bio contamination on SR insulators, except that the part of insulator shed with algae formation lost its hydrophobicity and lot of scale formation was observed on all the insulators.