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 CIGRÉ 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