Archives of Electrical Engineering

Abstract

This article deals with the analysis of the fractal dimension of streamers propagating in mineral oil, under lightning impulse voltage, using the box counting method; the method and technique of calculation are described therein. In the considered experimental conditions, the average velocities of recorded streamers are of 2.4 km/s and 1.8 km/s for positive and negative streamers, respectively; these velocities correspond to the 2 nd mode of streamers propagation. It is shown that the streamers present the fractal dimension 𝐷; and the higher 𝐷 is the bushier are the streamers (i.e. with high branch density). The positive streamers can have higher 𝐷 than the negative ones, if they are bushier.