JPS6412409A - Cross-linked polyethylene-insulated power cable having stainless steel sheath - Google Patents

Abstract

PURPOSE:To improve reliability without causing damage on a cable even if the amount of press-in at the time of forming is increased by arranging a semiconductor cushion layer between a metallic shield layer arranged on an insulation core and a corrugated stainless steel sheath located outside the shield layer. CONSTITUTION:Over a conductor 1 are arranged an inner semiconductive layer 2, a cross-linked polyethylene insulation layer 3 and an outer semiconductor layer 4 to form an insulation core A. Over the core A are arranged a metallic shield layer 5, a semiconductive cushion layer 6, a corrugated stainless steel sheath 7, and a corrosion prevention layer 8 of polyethylene. The cable formed in this way sustains less damage on the important parts such as the layer 5 and the core A even if the amount of press-in is increased at the time of corrugation forming of the sheath 7 because of the cushion effect of the layer 6 sandwiched between the sheath 5 and the layer 5. As a result, a gap g' within the cable can be made small. This makes the sheath and the core hard to be displaced from each other and reliability is improved.