AGEING STUDY OF HIGH VOLTAGE INSULATOR WITH NANO FILLERS

Silicon insulating materials with Nanofillers have attracted wide interest for enhancing electrical properties. In this work the experimental results of silicone rubber[SiR]nano based polymer outdoor insulators in salt fog ageing test based on IEC 62217 are presented. The specimen made of composite material by adding MgO and ZnO as Nano filler to Silicone Rubber as the base polymer with ATH. The samples prepared consists of Virgin without any nano filler as the reference , 10% MgO, 10% ZnO, 5% MgO, 5% ZnO nano-composite insulators. These five samples are kept in artificial salt fog chamber and aging test was conducted for a duration of 1000 hrs. Reduction of hydrophobicity, level of contamination are used as physical damaged inspection techniques were used to evaluate degree of surface deterioration. Differences in degree of surface deterioration were observed on all tested specimens just after salt fog test. It is observed that all the insulator withstood the test sample except with 10%MgO which have failed after 720 hrs of exposed to salt fog. All the samples performed well in inclined plane, tracking and erosion test. XRD on all samples before and after the test were carried out