Investigation Life Time Model of 22 kV XLPE Cable for Distri. application in Thailand. XLPE insulating material of 22 kV cable was∆ ⋅ = kT VF G exp fkT h t 2 0 2 1 2 (9) where ε0 is 8.85 * 10-12 F/m ε′ is the relative permittivity.XLPE Cables Containing Void Defect of single-core 95 mm2 XLPE cable, (1) copper conductor, (2) semiconducting material, (3). E and electric displacement D for the insulation material, in terms of the relative permittivity.permittivity of xlpe cable – – JYTOP Power cable High Voltage XLPE Cable Systems Techincal User Guide Brugg Cables Page 4 Selection process of cable design 1.3 Service life Cables are among the .Change of Dielectric Parameters of XLPE Cable due to Thermal Aging Keywords: insulation, XLPE cable, aging of XLPE, capacitance, dissipation factor, thermal aging, dielectric . dielectric constant, low dielectric loss, and..on electrical characteristics of XLPE insulation of high voltage cable. to explain the long time decaying and the latter one exhibits the features of field-limited space charge.To study the high frequency response of XLPE cable, the complex permittivity is .