An electric dc-cable with an insulation system comprising an...

H - Electricity – 01 – B

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H01B 9/02 (2006.01)

Patent

CA 2339541

An electric DC-cable with an insulation system comprising an extruded polyethylene composition and a method for manufacturing such a cable. The insulating system comprises an extruded cross-linked polyethylene based insulation disposed around the conductor. The extruded insulation system in addition to the polyethylene based compound includes an additive, which is a glycerol fatty acid ester of the general formula (I): R1O(C3H5(OR2)O)nR3 where n1, R1, R2, and R3, which are the same or different, designate hydrogen or the residue of a carboxylic acid with 8-24 carbon atoms, with the proviso that there are at least two free OH groups and at least one residue of a carboxylic acid with 8-24 carbon atoms in the molecule. In the method for producing the DC-cable the compounded polyethylene based composition is extruded and cross- linked at a temperature and for a period of time sufficient enough to cross- link the insulation.

La présente invention concerne un câble électrique pour courant continu avec système isolant comprenant une composition en polyéthylène, t le procédé de fabrication y relatif. Le système isolant comprend une gaine isolante à base de polyéthylène réticulé obtenue par extrusion. En plus du composé à base de polyéthylène, la gaine obtenue par extrusion renferme un additif sous forme d'ester d'acide gras de glycérol représenté par la formule générale (I): R?1¿O(C¿3?H¿5?(OR?2¿)O)¿n?R?3¿. Selon cette formule, n est supérieur ou égal à n?1, R?1¿, R?2¿ et R?3¿, qui sont identiques ou différents, désignent l'hydrogène ou le résidu d'acide carboxylique avec 8-24 atomes de carbone, à condition qu'il y ait au moins deux groupes OH libres et au moins un résidu d'acide carboxylique avec 8-24 atomes de carbone dans la molécule. La composition à base de polyéthylène utilisée pour la fabrication de ce câble est extrudée et soumise à une température suffisante pendant un laps de temps suffisant pour déclencher une réaction de réticulation.

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