Electrical cable for high voltage direct current transmission, and insulating composition

Abstract

Cable for high voltage direct current transmission, comprising at least one conductor and at least one extruded insulating layer consisting of a polymeric composition comprising a polyethylene and at least one unsaturated fatty acid. Insulating composition, comprising a polyethylene and at least one unsaturated fatty acid.

1 - 18 . (canceled) 
     
     
         19 . A high voltage direct current cable, comprising at least one conductor and at least one extruded insulating layer consisting of a polymeric composition consisting of:
 a polyethylene grafted with at least one unsaturated fatty acid; and   optionally, an effective amount of one or more conventional additives chosen from antioxidants, processing adjuvants, lubricants, pigments, water-tree retardants, and antiscorching agents.   
     
     
         20 . The cable according to  claim 19 , wherein the polymeric composition is not cross-linked. 
     
     
         21 . The cable according to  claim 19 , wherein the polymeric composition is cross-linked. 
     
     
         22 . The cable according to  claim 19 , wherein the polyethylene is a homopolymer of ethylene or a copolymer of ethylene with at least one α-olefin having a density in the range from 0.860 g/cm 3  to 0.970 g/cm 3 . 
     
     
         23 . The cable according to  claim 22 , wherein the α-olefin is an olefin having the general formula CH 2 ═CH—R, wherein R represents an alkyl group having 1 to 10 carbon atoms, linear or branched. 
     
     
         24 . The cable according to  claim 22 , wherein the α-olefin is chosen from: propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, and 1-dodecene. 
     
     
         25 . The cable according to  claim 19 , wherein the polyethylene is chosen from the following: high-density polyethylene having a density of at least 0.940 g/cm 3 ; medium-density polyethylene having a density in the range from 0.926 g/cm 3  to 0.940 g/cm 3 ; and low density polyethylene and linear low-density polyethylene having a density in the range from 0.910 g/cm 3  to 0.926 g/cm 3 . 
     
     
         26 . The cable according to  claim 19 , wherein the unsaturated fatty acid is oleic acid.