Heating assembly and method for insulation system restoration of a power cable

A heating assembly configured to receive a power cable joint of a power cable for restoring an insulation system of the power cable, the heating assembly comprising:

• a central pressurization and heating structure comprising:
• a first part including a first central channel configured to receive a first portion of the power cable,
• a second part including a second central channel configured to receive the first portion of the power cable,
• wherein the central pressurization and heating structure is configured to be set in a closed state in which the first central channel faces the second central channel to thereby form a central heating chamber extending from a first end to a second end, opposite the first end, of the central pressurization and heating structure,
• wherein the central pressurization and heating structure is configured to be pressurised to obtain a first pressure higher than atmospheric pressure inside the central heating chamber when the power cable is arranged sealed in the central heating chamber;
• and
• a pressure compensator system comprising:
• a first lateral structure extending laterally from the first end of the central pressurization and heating structure, the first lateral structure having a first lateral channel aligned with the central heating chamber and configured to receive a second portion of the power cable,
• a second lateral structure extending laterally from the second end of the central pressurization and heating structure, the second lateral structure having a second lateral channel aligned with the central heating chamber and configured to receive a third portion of the power cable,
• wherein the first lateral structure is configured to be pressurised to obtain a second pressure higher than atmospheric pressure in the first lateral channel when the power cable is arranged sealed in the first lateral structure, and wherein the second lateral structure is configured to be pressurised to obtain a third pressure higher than atmospheric pressure in the second lateral channel when the power cable is arranged sealed in the second lateral structure, and
• wherein each of the first lateral structure and the second lateral structure has an at least 20 cm long axially extending section which is primarily made of material at most having a conductivity of the order of 1000 S/m at 20° C.