CN104575836A - XLPE insulated water-blocking power cable - Google Patents

Abstract

A crosslinked polyethylene insulation water-blocking power cable relates to a power cable, which comprises a cable core, wherein a water-blocking tape wrapping cabling layer, an aluminum-plastic composite tape water-blocking layer, a polyethylene inner liner layer, a steel wire armor layer, a first water-blocking tape wrapping layer and a high-density polyethylene outer sheath layer are sequentially arranged outside the cable core; the cable core comprises three wire cores, each wire core comprises a water-blocking conductor formed by twisting a plurality of annealed bare copper wires and water-blocking spun yarns, and a conductor shielding layer, an insulating layer and an insulating shielding layer are sequentially extruded outside each water-blocking conductor through three-layer co-extrusion; a semi-conductive water-blocking expansion belt layer, a copper strip shielding layer and a second water-blocking belt wrapping layer are sequentially arranged on the outer side of the insulation shielding layer of each wire core; and a waterproof rubber filling layer is arranged between the cable core and the waterproof tape wrapping cabling layer. The invention has excellent water-blocking and water tree-resisting performance and high electrical performance, improves the stability and safety of power supply of a power grid line, prolongs the service life of a cable and reduces the power supply cost.

Description

XLPE insulated water-blocking power cable

technical field

The present invention relates to a power cable, in particular to a cross-linked polyethylene insulated water-blocking power cable.

Background technique

The application of cross-linked polyethylene (XLPE) insulated power cables in China has a history of more than 30 years. It is widely used in the power system due to its advantages of convenience and freedom from drop restrictions.

With the deepening of people's research and understanding of cable insulation water absorption and water tree, people are more and more aware of the importance of waterproof performance for XLPE insulated power cables. According to statistics, in the 10-35 kV power system of the domestic power grid, Underground directly buried XLPE insulated cables basically do not adopt a water-blocking structure. Generally, a large number of water trees grow after 8 to 12 years of operation, and breakdown accidents occur, seriously affecting the safe operation of the power grid. Therefore, cable water blocking technology is of great significance to ensure the reliability and life of XLPE cables. In areas with high groundwater levels or perennial rainy areas (such as the area south of the Yangtze River in my country), more and more users have put forward requirements for water blocking of cables.

Contents of the invention

The purpose of the invention is to overcome the shortcomings of ordinary cables and provide a cross-linked polyethylene insulated water-blocking power cable that can meet the needs of customers.

The present invention includes a cable core, on the outer side of the cable core, a water-blocking tape wrapping cable layer, an aluminum-plastic composite tape water-blocking layer, a polyethylene inner liner, a steel wire armor layer, and a first water-blocking tape wrapping layer are sequentially arranged. and a high-density polyethylene outer sheath layer; the cable core includes three wire cores, and each wire core includes a water-blocking conductor twisted by multiple annealed bare copper wires and water-blocking spun yarns. The outer sides of the water-blocking conductors are respectively extruded with three layers of co-extruded conductor shielding layer, insulating layer, and insulating shielding layer in sequence; on the outer sides of the insulating shielding layers of each strand core, there are also semiconducting resistance water expansion tape layers, copper A shielding layer and a second water-blocking tape wrapping layer; a water-blocking rubber filling layer is set between the cable core and the water-blocking tape wrapping layer.

The water-blocking conductor of the present invention adopts the compression-extraction process, so that the compression coefficient of the conductor is more than 0.94, and the water-blocking effect is good; the three-layer co-extrusion technology and the longitudinal and radial water-blocking technology are adopted, the structure is innovative, and the material is novel, so that the cable has excellent performance. Excellent water resistance and anti-water tree performance, high electrical performance, improve the stability and safety of power grid line power supply, extend the service life of cables, and reduce power supply costs.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

As shown in Figure 1, the present invention includes a cable core 1, and on the outside of the cable core, a water-blocking tape wrapping cable layer 2, an aluminum-plastic composite tape water-blocking layer 3, a polyethylene inner liner 4, and a steel wire armor layer 5 are sequentially arranged. 1. The first water-blocking tape wraps around the cladding 6 and the high-density polyethylene outer sheath 7; the cable core 1 includes three wire cores 1-1, and each wire core 1-1 includes a plurality of annealed bare copper wires and resistance wires respectively. The water-blocking conductor 8 twisted by water spun yarns is co-extruded in three layers on the outside of each water-blocking conductor 8, and the conductor shielding layer 9, insulating layer 10, and insulating shielding layer 11 are sequentially extruded; The outer side of the insulating shielding layer 11 of 1 is respectively provided with a semiconductive resistance water expansion tape layer 12, a copper tape shielding layer 13 and a second water blocking tape wrapping layer 14; the cable core 1 and the water blocking tape are wrapped to form a cable layer A water-blocking rubber filling layer 15 is arranged between the two.

Claims (1)

1. Cross-linked polyethylene insulated water-blocking power cable, characterized in that: it includes a cable core, and a water-blocking tape is wrapped around the outside of the cable core to form a cable layer, an aluminum-plastic composite tape water-blocking layer, and a polyethylene inner liner. , steel wire armor layer, the first water-blocking tape wrapping layer and high-density polyethylene outer sheath layer; The twisted water-blocking conductors are respectively extruded with three layers of co-extruded conductor shielding layer, insulating layer, and insulating shielding layer on the outside of each strand of water-blocking conductor; A semi-conductive water-swellable tape layer, a copper tape shielding layer and a second wrapping layer of water-blocking tape are respectively arranged in sequence; a water-blocking rubber filling layer is set between the cable core and the wrapping layer of water-blocking tape.