Parametric Analysis of HVDC Extruded Cable Reliability for Different Cable Designs

After former studies focused on pre-qualification test load cycles, focus is here on life fraction lost by HVDC XLPE-insulated cables with rated voltage up to 500 kV subject to Type Test load cycles after CIGRE Technical Brochure 496. This study is carried out by refining a previously developed procedure - implemented in Matlab - for reliability estimation using both an iterative solution for transient electric field calculation and Eoll's formula. A comparison with the results obtained by applying Eoll's formula is performed to check the accuracy of its approximation at TT voltage.