Fractal Characteristics of Negative Streamer Propagation in Liquid Dielectrics under Micro-second Pulse Voltage Application

Abstract

Branching structure of negative streamer in liquid dielectrics is found to have fractal characteristics. The fractal dimension of negative streamer in liquid dielectrics is constant during voltage application period, which also has been reported for several solid dielectrics. In case of the mixtures of hydrocarbon liquids and carbon tetrachloride, the fractal dimension decreases as the aspect of negative streamer is changed from bush-like one to tree-like one. The patterns of negative streamer aspects obtained from the simulation are compared with those obtained from the experiment.