Impact of Carbon Black Additive and Crosslinking Process on the Space Charge Build-Up in LDPE

Abstract

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