Electric cable coated with polyolefin and polymer with ester and epoxy groups
AssigneePirelli Cavi S.p.A.
InventorsFranco Peruzzotti, Valeria Garcia
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Abstract
A polymeric composition for coating electric cables for power transmission at medium/high voltage, having an improved resistance against the formation of the so-called water trees, comprises a polymeric polyolefin base including, in parts by weight to the total weight thereof, from 0.5 to 15 parts of ester groups and from 0.01 to 5 parts of epoxy groups. Electric cables according to the invention comprise at least one electrically conducting core (2) and an insulation coating (5) comprising the aforementioned polymeric composition.
Claims2
An electric cable comprising at least one conducting core and at least one electrically insulating coating obtained by extruding onto said conducting core a polymeric composition comprising an effective amount of a peroxide cross-linking agent and subsequently cross-linking the composition vie peroxide, said composition further comprising a polyolefin polymeric base consisting essentially of an ethylene polymer and, in parts by weight relative to the total weight thereof amounts:
- from 0.5 to 15 parts of ester groups;
- and
- from 0.01 to 5 parts of epoxy groups, said amounts of ester and epoxy groups, in combination, being such as to reduce the formation of water trees within the insulation coating after electric ageing in water, wherein said ester and epoxy groups are provided by an ethylene/acrylic ester/glycidyl methacrylate terpolymer having a Melt Index of from 0.1 g/10′ to 40 g/10′.
An electric cable comprising at least one conducting core and at least one
- insulation coating obtained by extruding onto said conducting core a polymeric composition including a polyolefin polymeric base and a polymeric compound having a Melt Index of from 0.1 g/10′ to 40 g/10′, wherein the polymeric composition includes, in parts by weight to the total weight thereof,
- from 0.5 to 15 parts of ester groups and
- from 0.1 to 5 parts of epoxy groups, said amounts of ester and epoxy groups, in combination, being such as to reduce the formation of water trees within the insulation coating after electric ageing in water.
Dependencies are inferred from the claim text.