Under operating conditions effect, insulated power cables can undergo critical degradations.Ultraviolet (UV) radiations are one of the most destructive constraints which affect the properties of thematerial used for insulation. Because of its good properties, crosslinked polyethylene (XLPE) is widelyused in medium voltage (MV) and high voltage (HV) cables insulation. Regardless of its excellentperformances, XLPE can degrade when exposed to UV. The objective of this work is to reportexperimental results concerning the effect of accelerated UV ageing on the properties of XLPE insulation.For this purpose, dielectric characterization, visual observations and scanning electron microscopy(SEM) analysis are performed to assess the extent of ageing. Obtained results show that UV ageingaffects greatly the XLPE insulation. So, an evolution in the dielectric properties (dielectric constant,dissipation factor, dielectric loss index and AC volume resistivity), color change and deterioration ofsurface morphology with ageing time are noticed.
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