Power Cable With Layer Having Anisotropic Thermal Conductivity

A method of making a joint between a metallic radial water barrier of a first cable section and of a second cable section of a power cable wherein:

• each of the first cable section and the second cable section includes:
• a conductor section, and
• an insulation system arranged around the conductor section, the insulation system including an inner semiconducting layer, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer, and
• a metallic radial water barrier arranged around the outer semiconducting layer;
• and
• an intermediate cable section located between the first cable section and the second cable section, the intermediate cable section including:
• an intermediate conductor section,
• an intermediate cable section insulation system arranged around the intermediate conductor section, the intermediate cable section insulation system extending between and joining the insulation systems of the first cable section and the second cable section, the intermediate cable section insulation system including an inner semiconducting layer arranged around the intermediate conductor section, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer,
• an intermediate cable section bedding layer arranged around the intermediate cable section insulation system, and a metallic radial intermediate cable section water barrier, arranged around the intermediate cable section bedding layer, the metallic radial intermediate cable section water barrier being thermally joined with the metallic radial water barrier of the first cable section and of the second cable section, wherein A) the metallic radial water barrier of the first and/or the second cable section is leadfree, and/or B) the metallic radial intermediate cable section water barrier is leadfree,
• wherein the intermediate cable section bedding layer has an anisotropic thermal conductivity, with a higher thermal conductivity in a longitudinal axial direction of the power cable than in a radial direction of the power cable, and comprising:
• a) making the intermediate cable section insulation system which connects with the insulation system of the first cable section and of the second cable section,
• b) providing the intermediate cable section bedding layer around the intermediate cable section insulation system,
• c) providing the metallic radial intermediate cable section water barrier around the intermediate cable section bedding layer, and
• d) thermally joining the metallic radial intermediate cable section water barrier with the metallic radial water barrier of the first cable section and of the second cable section.