Core wire structure for medium-voltage power cable

Abstract

The invention discloses a core wire structure for a medium-voltage power cable, which sequentially comprises (from inside to outside) a compressed conductor, a conductor semiconduction shielding layer, an insulating layer, an insulation semiconduction shielding layer, a metallic shielding layer, a belting layer and an outer sheath, wherein, the insulating layer is made from a water-resistant insulating material. The core wire structure solves the problem that the original cable insulation water-resistance of the medium-voltage XLPE insulated cable with water resistance must adopt a water-resistant filler layer and a fastening anticorrosive metal sleeve in a cable direction, thus greatly simplifying the structure of the medium-voltage XLPE insulated cable with water resistance, enhancing the production efficiency and greatly saving resources. The structure has the advantages of simple structure, less resource consumption, simplified manufacturing technique, improved service life, convenient laying and connection, lower total life cycle cost of the cable.

Description

technical field [0001] The invention relates to a core wire structure, in particular to a core wire structure constituting medium-voltage power cables of various forms and specifications. technical background [0002] Usually, power cables are laid underground, and the insulation of XLPE solid insulated power cables is subjected to water intrusion due to various factors, and gradually forms the growth and development of water trees in the insulation, which eventually leads to a decrease in dielectric strength and a reduction in the operating life of the cable. The adverse effects of this factor, the study of technical means to prevent or delay the growth and development of water trees, or the research of "water resistance" for short, in the research of medium voltage cable structures that require water resistance, the metal sleeve method is often used To improve, in this method, taking the single core as an example, from the inside to the outside, it is the conductor, the co...

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Problems solved by technology

[0002] Usually, power cables are laid underground, and the insulation of XLPE solid insulated power cables is subjected to water intrusion due to various factors, and gradually forms the growth and development of water trees in the insulation, which eventually leads to a decrease in dielectric strength and a reduction in the operating life of the cable. The adverse effects of this factor, the study of technical means to prevent or delay the growth and development of water trees, or the research of "water resistance" for short, in the research of medium voltage cable structures that require water resistance, the metal sleeve method is often used To improve, in this method, taking the single core as an example, from the inside to the outside, it is the conductor, the conductor shielding layer, the insulation layer, and prevents the radial (vertical direction along the cable direction) development and longitudinal development (along the cable direction) of moisture. direction of water-blocking filling material layer) water-blocking filling material layer, metal shielding layer, metal sleeve and outer sheath, wherein the metal sleeve is a steel pipe or an aluminum alloy tube, which is used to tightly wrap the water-blocking filling material and prevent diameter In order to block the water intrusion into the insulation layer, the metal sleeve must be used in the manufacture of the medium voltage cable, which makes the manufacturing process complicated, the laying and connection technology is difficult, and wastes resources, while the metal sleeve Corrosion of the tubes is still not completely resolved, therefore, moisture intrusion still exists, and the operating life of the cables is still not improved as it should be

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