Effect of Conductivity Coefficients on DC Breakdown Strength of Multilayer Cable

In a DC cable joint, the material properties and size of rubber layer vary with jointing kit manufacturers. Hence the conductivity coefficients of rubber are more likely to vary when compared to that of XLPE. The sensitivity of breakdown strength of cable insulation to stress and temperature coefficients is already established in literature. Hence, in this paper, the authors have performed a preliminary analysis on the effect of rubber conductivity coefficients on the breakdown strength of concentric XLPE-Rubber cable. The effect of rubber thickness in proportion to XLPE thickness on the breakdown strength of multilayer cable was also investigated at different stress coefficient ranges. The results are believed to be useful for jointing kit manufacturers.