A New Model of Investigating the Electric Field in Dielectric Liquid for Streamer Initiation

Abstract

The initial filamentary streamers in liquid dielectrics drastically changes by the tip curvature of the electrode and the applied voltage. In this paper to get the non uniform field a sphere-to-plane electrodes configuration is used. Also, an immersed air bubble adjacent to the sphere electrode is presented, to obtain the sharp tip, after the air bubble compressed against the sphere electrode i.e., sharp conducting protrusion tip, which considered as a source of high non-uniform field and streamer initiation. A simulation model for field distribution in the dielectric medium is presented by using Finite Element Method. An experimental technique was used to investigate the accuracy of the field simulation. Also an analytical equation for field calculation was used to investigate the percentage field error.