AN ELECTRIC DC-CABLE WITH AN INSULATION SYSTEM COMPRISING AN EXTRUDED POLYETHYLENE COMPOSITION AND A METHOD FOR MANUFACTURING SUCH CABLE

摘要

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 whe re n1, R1, R2, and R3, which are the same or different, designate hydrogen or t he 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 carboxyl ic 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.