A STUDY ON THE RELATION BETWEEN LEAKAGE CURRENT AND SPECIFIC CREEPAGE DISTANCE

International audienceThe usage of polymeric insulators is common due to their advantages in comparison with porcelain insulators. Environmental and electrical stresses have got deteriorating effects on polymeric insulators. Thus, knowing about behaviour of these types of insulators under various stresses is necessary. Till now, various electrical tests have been performed on polymeric insulators to investigate their performance in different situations and to provide a solution for predicting their effective lifetime. Also some standards for testing polymeric insulators have been proposed e.g. IEC62217. In this paper, three pairs of similar 63kV and three pairs of similar 132kV polymeric insulators have been selected for studying the relation between leakage current of polymeric insulators and their specific creepage distance based on IEC62217 standard. The specimens have been tested in three different creepage distances which are proportion of overall creepage distance. The Fast Fourier Transform analysis has been used to find the harmonic spectrum of the leakage current. The results showed that the amplitude of harmonic components for 63kV insulators in all three cases is mostly equal to each other and similarly for 132kV insulators