Insulated power cable

In a rubber or plastic insulated power cable comprising a conductor and having formed thereon in the following order:

• at least an inner semiconductor layer, an insulation layer, and an outer semiconductor layer formed thereon wherein at least one layer selected from the group consisting of said inner semiconductor layer, said insulation layer, and said outer semiconductor layer, is formed of a crosslinked structure of an olefin resin composition comprising an olefin resin and at least one crosslinking agent selected from the group consisting of m-(tert-butylperoxyisopropyl)-isopropylbenzene and p-(tert-butylperoxyisopropyl)-isopropylbenzene.

The power cable according to claim 1 to 5, wherein said olefin resin composition further contains 4,4'-thiobis(3-methyl-6-tert-butylphenol) and/or bis[2-methyl-4-(3-n-alkylthiopropionyloxy)-5-tert-butylphenyl] sulfide as an antioxidant or antioxidants.

In a joint system for power cables, which comprises a conductor joint between two rubber or plastic insulated power cables, said power cables having a conductor core, an inner semiconductor layer, an insulation layer and an outer semiconductor layer, said conductor joint having an inner semiconductor layer, an insulation layer, and an outer semiconductor layer, successively formed thereon or around the vicinities thereof, wherein at least one layer selected from the group consisting of said inner semiconductor layer, said insulation layer, and said outer semiconductor layer, is formed of a crosslinked structure of an olefin resin composition comprising an olefin resin and at least one crosslinking agent selected from the group consisting of m-(tert-butylperoxyisopropyl)-isopropylbenzene and p-(tert-butylperoxyisopropyl)-isopropylbenzene.