METHOD FOR EXTRACTING CROSSLINKING BY-PRODUCTS FROM A CROSSLINKED ELECTRICALLY INSULATING SYSTEM OF A POWER CABLE AND RELATED POWER CABLE

摘要

The present disclosure relates to an energy cable comprising at least one cable core comprising an electric conductor, a crosslinked electrically insulating layer, and particles of a zeolite system comprising at least a first zeolite and a second zeolite placed in the cable core. The particles of the first zeolite are able to extract and absorb, very efficiently and irreversibly, the by-products deriving from the crosslinking reaction, so as to avoid space charge accumulation in the insulating material during cable lifespan. The particles of the second zeolite are able to absorb the water molecules that unexpectedly form from the dimerization/oligomerization and decomposition reaction of the crosslinking by-products upon their absorption on the first zeolite, so as to avoid the formation of water-trees in the insulating material. Moreover, the present invention relates to a method for extracting crosslinking by-products from a cross-linked electrically insulating layer of an energy cable core, which comprises manufacturing the energy cable core comprising particles of the above-said zeolite system, heating the energy cable core up to a temperature causing migration of the crosslinking by-products from the crosslinked electrically insulating layer; and then placing a metal screen around the energy cable core.