Extra-low frequency dielectric relaxation: Characterization of crosslinking byproducts in XLPE HVDC cable insulation

With the advancement of HVDC cable systems toward higher voltage levels, the performance requirements for cable insulation have become increasingly stringent. Crosslinked polyethylene (XLPE) insulation inevitably introduces crosslinking byproducts during manufacturing, which increase conductivity, promote space charge accumulation, and reduce breakdown strength. Therefore, post-treatment degassing is critical. CIGRE Technical