Power Cable with Water-Blocking Capability
AssigneeNKT HV Cables AB
InventorJörn Antonischki
Life of this patent
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Abstract
A power cable including: a multi-strand conductor, an insulation system arranged around the multi-strand conductor, the insulation system having an inner semiconducting layer arranged around the multi-strand conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer, and a water-blocking compound, wherein the multi-strand conductor alternatingly has first longitudinal axial sections with the water-blocking compound filling all voids between conductor strands of the multi-strand conductor to restrict longitudinal water ingress inside the multi-strand conductor, and second longitudinal axial sections free of the water-blocking compound.
Claims20
Power cable comprising:
- a multi-strand conductor,
- an insulation system arranged around the multi-strand conductor, the insulation system having an inner semiconducting layer arranged around the multi-strand conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer, and
- a water-blocking compound,
- wherein the multi-strand conductor alternatingly has first longitudinal axial sections with the water-blocking compound filling all voids between conductor strands of the multi-strand conductor to restrict longitudinal water ingress inside the multi-strand conductor, and second longitudinal axial sections free of the water-blocking compound.
Method of manufacturing a power cable, comprising:
- a) forming a multi-strand conductor in a conductor stranding line,
- wherein step a) involves stranding a plurality of conductor strands and applying a water-blocking compound on the conductor strands during the stranding intermittently such that the multi-strand conductor alternatingly has first longitudinal axial sections where the water-blocking compound fills all voids between the conductor strands of the multi-strand conductor to restrict longitudinal water ingress inside the multi-strand conductor, and second longitudinal axial sections free of the water-blocking compound, and
- b) providing an insulation system around the multi-strand conductor, the insulation system comprising an inner semiconducting layer arranged around the multi-strand conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer.
Dependencies are inferred from the claim text.