Effects of condition of water blocking tape on the buffer layer failures of high voltage XLPE cables in electric field and temperature field

• Buffer layer failure of HV XLPE cables has occurred frequently in recent years. • White powders appear on the surface of water blocking tape of these failure cables. • Resistivity, relative permittivity and thermal conductivity of the tape are measured. • Reasons for the change of electric and thermal properties of the tape are explained. • Electric field and temperature field of buffer layer are calculated by finite element. • Cause of buffer...