Multi-physical processes during electric field disturbance in solid dielectric near water micro-inclusions connected by conductive channels

Multi-physical processes of a strong electric field perturbations in a solid dielectric near various water micro-inclusions jointed by conductive channels are studied. It is simulated the closely located water micro-inclusions of spheroid shape with water treeings on its surface, which are connected by cylindrical channels in the XLPE insulation of super high-voltage cables. The regularities of influence the micro-inclusions shapes and its mutual locations as well as the connecting channels conductance on the changes of the field strength, tensed volume, electromechanical pressures and the total current density in the dielectric were determined. The comparison of the field perturbations in the insulation both with taking into account dependence of insulation conductivity on the field strength and without consideration such dependence is made.