Résumé
In this study, the impact of carbon black additive and cross-linking process on the space charge accumulation in polyethylene for High Voltage Direct Current cable insulation is investigated. Samples are cast from classically cross‐linkable polyethylene pellets with and without carbon black. Curing at different temperatures was carried out and the obtained samples were characterised by several techniques. The measurements showed that the samples within 0.8 wt% carbon black additive accumulate less space charge and allow to obtain a better cross-linking degree at a curing temperature of 160°C. These results are helpful to optimise the materials and manufacturing process. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.