CN201069676Y - Cross-linked polythene insulation power cable based on fully water retarding and resisting tree - Google Patents

Abstract

A water-blocking, water-tree-resistant, cross-linked polyethylene insulated power cable. It can be a single-core structure or a three-core structure. The single-core structure is composed of a water-blocking conductor 1, an inner shielding layer 2, and The insulating layer 3, the outer shielding layer 4, the semiconducting resistance water inner layer 5, the metal shielding layer 6, the semiconducting resistance water outer layer 7, the radial moisture barrier layer (8) and the outer protection layer 9; the three-core structure is composed of Three insulated wire cores 10 and water-blocking filling rope 11 are twisted into a cable, and the outer layer is composed of a water-blocking layer 12, a radial moisture-blocking layer 8', and an outer sheath 9' in sequence, and the water-blocking conductor 1 is composed of a plurality of metal single wires 13 It is twisted, and the insulating water blocking tape 14 is overlapped between the twisted layers of the metal single wire 13 . The utility model adopts longitudinal and radial water blocking methods through conductors, insulating materials, and cable structures, thereby effectively inhibiting the immersion of water in the use of the cross-linked cable and the generation of water trees in the insulation, and significantly reducing the failure rate of the cross-linked cable. Provide a new type of cable product for the wire and cable industry.

Description

Total resistance water tree resistance XLPE insulated power cable

Technical field:

The utility model relates to the field of mechanical manufacturing, and specifically belongs to the field of electric wire and cable mechanical manufacturing.

Background technique:

At present, the production and application of cross-linked polyethylene insulated power cables has a history of nearly 30 years. They have excellent electrical and mechanical properties in a dry environment. Short-term or long-term immersion in water, if the cable has no water-blocking measures or the water-blocking measures are damaged, the cable will be partially flooded, and the insulating material used to make XLPE insulated power cables is ordinary XLPE insulating material. After a period of time after the cable enters the water, it will be found that a large number of water trees appear in the insulation, resulting in a sharp decline in the electrical and mechanical properties of the insulation, causing a safety hazard. The purpose of the utility model is to provide a fully-blocking water-resistant cross-linked polyethylene insulated power cable that can effectively prevent water from entering the cable and prevent water trees from forming in the cable insulation after water entering.

Contents of the utility model: The utility model can be a single-core structure or a three-core structure. The single-core structure is composed of a water-blocking conductor, an inner shielding layer, an insulating layer, an outer shielding layer, and a semiconducting resistance water inner layer from the inside to the outside. Layer, metal shielding layer, semi-conductive resistance water outer layer, radial moisture barrier and outer sheath; the three-core structure is composed of three insulated wire cores, water-blocking filling rope, water-blocking layer, radial moisture-blocking layer and outer sheath The sheath consists of three insulated wire cores and water-blocking filling ropes twisted into a cable, and the outer layer is a water-blocking layer, a radial moisture barrier, and an outer sheath in turn. The insulated wire core is composed of a water-blocking conductor, an inner shielding layer, an insulating layer, outer shielding layer, semi-conductive resistance water layer, and metal shielding layer, wherein the water-blocking conductor is made of multiple metal single wires twisted, and the insulating water-blocking tape is overlapped between the layers of the metal single-wire twisted layers . Since the conductor adopts a compact conductor structure, each layer of the conductor is wrapped with an insulating water-blocking tape to achieve the purpose of longitudinal water-blocking of the conductor; a new type of anti-water tree cross-linked polyethylene insulating material is added by adding a new anti-water tree additive, Change the crystallographic shape and size inside the material, increase the voltage of electric tree water tree in the material, and reduce the growth rate of electric tree water tree, so as to achieve a good anti-water tree effect; before and after the metal shielding, the overlapping wrapping form of semi-conductive resistance water tape is used, which is better The purpose of preventing water from entering the cable in the longitudinal direction; the three-core structure cable is filled with water-blocking rope to achieve water-blocking in the longitudinal direction; the aluminum-plastic composite tape is longitudinally welded to achieve radial water-blocking; the outermost sheath is made of water-blocking material with good water-blocking effect It is extruded from high-density polyethylene material to achieve the purpose of water blocking on the outermost layer of the cable. The utility model can effectively suppress the generation of water trees during the use of cross-linked cables, significantly reduce the failure rate of cross-linked cables, avoid huge economic losses caused by cable failures, and provide a new type of cable for the wire and cable industry.

Description of drawings:

The utility model specification includes three drawings, and the drawings of the drawings are as follows:

Fig. 1, the schematic diagram of the structure of the water-blocking conductor of the utility model

Fig. 2. Schematic diagram of the cross-section of the single core of the utility model

Figure 3, the utility model three-core cross-sectional schematic diagram

In the figure: 1, 1' are water-blocking conductors, 2, 2' are inner shielding layers, 3, 3' are insulating layers, 4, 4' are outer shielding layers, 5, 5' are semiconducting resistance water inner layers, 6, 6' is the metal shielding layer, 7 is the semiconductive resistance water outer layer, 8, 8' is the radial moisture barrier, 9, 9' is the outer sheath, 10 is the insulating core, 11 is the water blocking filling rope , 12 is a water-blocking layer, 13 is a metal single wire, and 14 is an insulating water-blocking tape.

Embodiment of the utility model: The utility model can be a single-core structure or a three-core structure. The single-core structure is composed of a water-blocking conductor 1, an inner shielding layer 2, an insulating layer 3, and an outer shielding layer 4 from the inside to the outside. , a semiconductive resistance water inner layer 5, a metal shielding layer 6, a semiconductive resistance water outer layer 7, a radial moisture barrier 8 and an outer protective layer 9; the three-core structure is composed of three insulated wire cores 10, a water-blocking filling rope 11. Water-blocking layer 12, radial moisture-blocking layer 8' and outer sheath 9'. After three insulated wire cores 10 and water-blocking filling rope 11 are twisted into cables, the outer layer is followed by water-blocking layer 12, radial barrier Moisture layer 8', outer sheath 9', insulated wire core 10 is composed of water-blocking conductor 1', inner shielding layer 2', insulating layer 3', outer shielding layer 4', semi-conductive resistance water layer 5', metal shielding layer 6', the water-blocking conductors 1, 1' are formed by twisting a plurality of metal single wires 13, and the insulating water-blocking tape 14 is overlapped between the layers of the twisted metal single wires 13 (see Fig. 1 and Fig. 2). Among them, the metal single wire 13 can be made of metal copper single wire; it can also be made of metal aluminum single wire; the insulating layer 3, 3' is made of waterproof tree cross-linked polyethylene material; the radial moisture barrier layer 8, 8' is Made of longitudinally wrapped aluminum-plastic composite tape.

Claims (4)

1. A fully water-blocking, water-tree-resistant, cross-linked polyethylene insulated power cable, which can be a single-core structure or a three-core structure. The single-core structure is composed of water-blocking conductors (1), inner Shielding layer (2), insulating layer (3), outer shielding layer (4), semiconductive resistance water inner layer (5), metal shielding layer (6), semiconductive resistance water outer layer (7), radial moisture barrier layer (8) and outer sheath (9); the three-core structure is composed of three insulated wire cores (10), water-blocking filling rope (11), water-blocking layer (12), radial moisture-blocking layer (8') Composed of outer sheath (9'), three insulated cores (10) and water-blocking filling rope (11) are twisted into a cable, and the outer layer is followed by water-blocking layer (12) and radial moisture-blocking layer (8') , outer sheath (9'), insulated wire core (10) is composed of water-blocking conductor (1'), inner shielding layer (2'), insulating layer (3'), outer shielding layer (4'), semiconducting Composed of a resistance water layer (5') and a metal shielding layer (6'), it is characterized in that the water resistance conductor (1, 1') is formed by twisting a plurality of metal single wires (13). The overlapping insulation water-blocking tapes (14) are overlapped between the combined layers. 2. The water-blocking and water-tree-resistant XLPE power cable according to claim 1, characterized in that the metal single wire (13) can be a metal copper single wire or a metal aluminum single wire. 3. The water-resistant and water-tree-resistant cross-linked polyethylene insulated power cable according to claim 1, characterized in that the insulating layer (3, 3') is made of waterproof tree cross-linked polyethylene insulating material. 4. The water-blocking, water-tree-resistant, cross-linked polyethylene insulated power cable according to claim 1, characterized in that the radial moisture barrier (8, 8') is made of longitudinally wrapped aluminum-plastic composite tape.

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