cross-linked polyethylene insulation 6 зшито-поліетиленова ізоляція power cables 3 силові кабелі 3 aging factors and mechanisms 1 asymmetry 1 cable damages (damages of metallic shield/neutral 1 cable lines 1 composite insulating materials 1 computer modeling 1 conductor shield and insulation shield 1 corrosion of conductor and metallic shield /neutral 1 current loading 1 electric filed outside the cable 1 electrical wires 1 environmental friendliness 1 esting methods 1 extra-high voltage 1 fiber-optic technologies 1 high-frequency overvoltages 1 high-voltage cable 1 higher harmonics 1 insulation aging 1 macro- and micro-sized defects 1 main insulation) 1 monitoring of technical state 1 nano-composite insulating materials 1 non-sinusoidal voltage 1 outer semiconducting layer 1 partial discharges 1