Water-tree-resistant corrosion-resistant medium-voltage power cable

Abstract

The utility model discloses a water tree resistant corrosion resistant medium voltage power cable, comprising a cable core, the cable core is composed of six groups of wire cores, a tensile core and a filling layer, the six groups of wire cores and the tensile core are twisted together, the filling layer is filled between the wire cores and the tensile core, the outside of the cable core is provided with a composite corrosion resistant layer, and the composite corrosion resistant layer is coated on the outer surface of the cable core. A composite corrosion-resistant layer is arranged outside the power cable, a composite water-tree-resistant layer is arranged outside the composite corrosion-resistant layer, an armor layer is arranged outside the composite water-tree-resistant layer, an outer sheath is arranged outside the armor layer, and the outer sheath is formed on the outer surface of the armor layer in an extrusion mode, so that the problem that the dielectric property is reduced due to the fact that the power cable is poor in water-tree resistance is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a water-tree-resistant and corrosion-resistant medium-voltage power cable. Background Art

[0002] Power cable is an important part of the power system, used to transmit and distribute electric energy. It consists of a core, an insulation layer, a protective layer and other parts. It has various types and specifications and is suitable for different voltage levels and environmental conditions. It can efficiently transmit electric energy, reduce line losses and improve energy utilization. At the same time, power cables also have high safety and reliability, which can ensure the stable operation of the power system.

[0003] For example, the Chinese authorized patent "Anti-corrosion and wear-resistant cable" with announcement number CN21182820U includes a wire core and an outer sheath, a bracket is installed in the inner cavity of the outer sheath, a plurality of wire slots are arranged on the bracket, the wire core is installed in the wire slot, and also includes a support ring installed in the outer sheath, a card slot is arranged on the inner ring surface of the support ring, and a fixed column installed on the support ring, and a wear-resistant end is arranged at the outer end of the fixed column. The structure with an anti-corrosion layer and a wear-resistant end on the outer skin can reduce friction when friction occurs between the cable and the ground or wall, and has an anti-wear effect.

[0004] Although the above-mentioned prior art can improve the wear resistance and corrosion resistance of the cable, when the cable is in a humid environment for a long time, moisture will penetrate into the cable insulation layer and form tiny channels or branch structures inside the insulating material, forming water trees, which will increase the conductivity of the cable insulation layer, thereby reducing the dielectric properties of the cable, and further causing electric field distortion, increasing the electric field stress of the cable, and even causing electrical breakdown. Therefore, it does not meet the existing needs. In this regard, we propose a water-tree-resistant and corrosion-resistant medium-voltage power cable. Utility Model Content

[0005] The utility model aims to provide a water-tree-resistant and corrosion-resistant medium-voltage power cable to solve the problem in the above-mentioned background technology that the power cable has poor water-tree resistance, thereby causing a decrease in dielectric performance.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a water-tree-resistant and corrosion-resistant medium-voltage power cable, comprising a cable core, wherein the cable core is composed of a wire core, a tensile core and a filling layer, the wire core is provided with six groups, and the six groups of wire cores and the tensile core are twisted together to form, the filling layer is filled between the wire core and the tensile core, a composite corrosion-resistant layer is provided on the outside of the cable core, a composite water-tree-resistant layer is provided on the outside of the composite corrosion-resistant layer, an armor layer is provided on the outside of the composite water-tree-resistant layer, an outer sheath is provided on the outside of the armor layer, and the outer sheath is extruded and molded on the outer surface of the armor layer.

[0007] Preferably, the wire core includes an aluminum alloy monofilament, an insulating base layer, a semi-conductive layer and a reinforcing layer, a plurality of aluminum alloy monofilaments are provided, and the aluminum alloy monofilaments are twisted into shape, the insulating base layer is wrapped around the outside of the aluminum alloy monofilament, and the insulating base layer is extruded on the outside of the aluminum alloy monofilament, and the semi-conductive layer is extruded on the outer surface of the insulating base layer.

[0008] Preferably, the composite corrosion-resistant layer includes an anti-corrosion inner layer, an isolation layer and an anti-corrosion outer layer, the anti-corrosion inner layer is wrapped around the outer surface of the cable core, the isolation layer is wrapped around the outer surface of the anti-corrosion inner layer, and the anti-corrosion outer layer is wrapped around the outer surface of the isolation layer.

[0009] Preferably, the composite anti-water-treeing layer comprises a reinforcement layer and a waterproof and breathable layer, the reinforcement layer is wrapped on the outer surface of the composite corrosion-resistant layer, and the waterproof and breathable layer is wrapped on the outer surface of the reinforcement layer.

[0010] Preferably, a plurality of steel wires distributed in a ring shape are provided inside the armor layer.

[0011] Preferably, the thickness of the outer sheath is greater than the thickness of the composite corrosion-resistant layer, and the thickness of the outer sheath is greater than the thickness of the composite anti-water-treeing layer.

[0012] Preferably, glass fiber tapes are filled between the aluminum alloy monofilaments.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. In order to improve the anti-water tree performance of the cable, the utility model arranges a reinforcement layer outside the cable core. The reinforcement layer is made of aramid fiber material, which can effectively inhibit the growth of water trees and improve the electrical performance and service life of the cable. The waterproof and breathable layer is made of a polymer breathable membrane material, which allows the moisture inside the cable core to pass through and be discharged, while preventing external moisture from entering, thereby further inhibiting the growth of water trees. The composite anti-water tree layer has excellent performance stability, which can ensure the stability and reliability of the performance of the cable during long-term operation.

[0015] 2. In order to improve the corrosion resistance of the cable, the utility model is composed of an anti-corrosion inner layer, an isolation layer and an anti-corrosion outer layer. The anti-corrosion inner layer is corrosion-resistant rubber, which effectively protects the cable from the corrosion of the external environment and extends the service life of the cable. The isolation layer is made of semi-conductive polymer material, which reduces the contact between the conductor and the external environment and further reduces the risk of corrosion. The anti-corrosion outer layer, the anti-corrosion inner layer and the isolation layer can form a multi-layer protective barrier to improve the corrosion resistance and reliability of the cable.

[0016] 3. The utility model arranges an insulating composite layer outside the conductor, which is composed of an insulating base layer, a semi-conductive layer and a reinforcing layer. The semi-conductive layer and the reinforcing layer can effectively reduce the influence of electric field stress on the insulating layer, inhibit the growth of water trees, and improve the electrical performance and service life of the cable. By adopting an insulating layer made of high molecular cross-linked polyethylene, the insulation effect of the cable can be enhanced and the risk of current leakage can be reduced. The insulating base layer, the semi-conductive layer and the reinforcing layer form a multi-layer protective barrier to improve the durability and reliability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of the utility model;

[0019] Figure 3 For the utility model Figure 2 A partial enlarged view of the middle A area;

[0020] Figure 4 This is a schematic diagram of the structure of the composite corrosion-resistant layer of the utility model;

[0021] Figure 5 It is a schematic diagram of the composite water-resistant tree layer structure of the utility model.

[0022] In the figure: 1. Cable core; 2. Wire core; 3. Tensile core; 4. Filling layer; 5. Composite corrosion-resistant layer; 6. Composite anti-water tree layer; 7. Armor layer; 8. Outer sheath; 9. Aluminum alloy monofilament; 10. Insulating base layer; 11. Semi-conductive layer; 12. Reinforcement layer; 13. Anti-corrosion inner layer; 14. Isolation layer; 15. Anti-corrosion outer layer; 16. Reinforcement layer; 17. Waterproof and breathable layer; 18. Steel wire. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figure 1-5 The utility model provides an embodiment: a water-tree-resistant and corrosion-resistant medium-voltage power cable, comprising a cable core 1, the cable core 1 is composed of a wire core 2, a tensile core 3 and a filling layer 4, the wire core 2 is provided with six groups, and the six groups of wire cores 2 are twisted together with the tensile core 3, the filling layer 4 is filled between the wire core 2 and the tensile core 3, a composite corrosion-resistant layer 5 is provided on the outside of the cable core 1, a composite water-tree-resistant layer 6 is provided on the outside of the composite corrosion-resistant layer 5, an armor layer 7 is provided on the outside of the composite water-tree-resistant layer 6, an outer sheath 8 is provided on the outside of the armor layer 7, and the outer sheath 8 is extruded on the outer surface of the armor layer 7.

[0025] See also Figure 2 and Figure 3 The wire core 2 includes an aluminum alloy monofilament 9, an insulating base layer 10, a semi-conductive layer 11 and a reinforcing layer 12. A plurality of aluminum alloy monofilaments 9 are provided, and the aluminum alloy monofilaments 9 are twisted to form a structure. The insulating base layer 10 is wrapped around the outside of the aluminum alloy monofilament 9, and the insulating base layer 10 is extruded around the outside of the aluminum alloy monofilament 9. The semi-conductive layer 11 is extruded around the outer surface of the insulating base layer 10. The conductor is composed of the aluminum alloy monofilament 9 and is responsible for transmitting current. The insulating base layer 10 is made of cross-linked polyethylene to isolate the conductor layer from the external environment and prevent current leakage. The semi-conductive layer 11 is made of semi-conductive rubber, which can evenly distribute the electric field and reduce the field strength during cable operation, thereby reducing the influence of electric field stress on the insulating layer. The reinforcing layer is polyethylene containing an anti-water tree agent to improve durability.

[0026] See also Figure 4 The composite corrosion-resistant layer 5 includes an anti-corrosion inner layer 13, an isolation layer 14 and an anti-corrosion outer layer 15. The anti-corrosion inner layer 13 is wrapped on the outer surface of the cable core 1, the isolation layer 14 is wrapped on the outer surface of the anti-corrosion inner layer 13, and the anti-corrosion outer layer 15 is wrapped on the outer surface of the isolation layer 14. The anti-corrosion inner layer 13 is corrosion-resistant rubber, which mainly protects the inside of the cable from corrosion; the isolation layer 14 is a semi-conductive polymer, which isolates the cable core 1 from the external environment and further reduces the contact between the corrosive medium and the inside of the cable; the anti-corrosion outer layer 16 is anti-rust paint, which protects the outer surface of the isolation layer 14 to prevent the external environment from corroding the cable, forming a multi-layer protective barrier, and improving the corrosion resistance and reliability of the cable.

[0027] See also Figure 5 The composite anti-water treeing layer 6 includes a reinforcement layer 16 and a waterproof and breathable layer 17. The reinforcement layer 16 is wrapped on the outer surface of the composite corrosion-resistant layer 5, and the waterproof and breathable layer 17 is wrapped on the outer surface of the reinforcement layer 16. The composite anti-water treeing layer has excellent performance stability and can ensure the stability and reliability of the performance of the cable during long-term operation.

[0028] See also Figure 2 A plurality of steel wires 18 distributed in an annular shape are arranged inside the armor layer 7 to improve the overall tensile resistance and strength of the cable.

[0029] See also Figure 2 The thickness of the outer sheath 8 is greater than the thickness of the composite corrosion-resistant layer 5 , and the thickness of the outer sheath is greater than the thickness of the composite anti-water tree layer 6 .

[0030] Furthermore, glass fiber tapes are filled between the aluminum alloy monofilaments 9, which have the characteristics of being non-absorbent, corrosion-resistant, mildew-resistant, wear-resistant, and having a long service life.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A water-tree-resistant and corrosion-resistant medium-voltage power cable, comprising a cable core (1), characterized in that: The cable core (1) is composed of a wire core (2), a tensile core (3) and a filling layer (4); the wire core (2) is provided in six groups, and the six groups of wire cores (2) and the tensile core (3) are twisted together to form a shape; the filling layer (4) is filled between the wire core (2) and the tensile core (3); a composite corrosion-resistant layer (5) is provided on the outside of the cable core (1); a composite water-resistant layer (6) is provided on the outside of the composite corrosion-resistant layer (5); an armor layer (7) is provided on the outside of the composite water-resistant layer (6); an outer sheath (8) is provided on the outside of the armor layer (7); and the outer sheath (8) is extruded on the outer surface of the armor layer (7).

2. The water-tree-resistant and corrosion-resistant medium-voltage power cable according to claim 1, characterized in that: The wire core (2) comprises an aluminum alloy single wire (9), an insulating base layer (10), a semi-conductive layer (11) and a reinforcing layer (12); a plurality of aluminum alloy single wires (9) are provided, and the aluminum alloy single wires (9) are twisted to form a conductor; the insulating base layer (10) is wrapped around the outside of the aluminum alloy single wire (9), and the insulating base layer (10) is extruded on the outside of the aluminum alloy single wire (9); and the semi-conductive layer (11) is extruded on the outer surface of the insulating base layer (10).

3. The water-tree-resistant and corrosion-resistant medium-voltage power cable according to claim 1, characterized in that: The composite corrosion-resistant layer (5) comprises an anti-corrosion inner layer (13), an isolation layer (14) and an anti-corrosion outer layer (15); the anti-corrosion inner layer (13) is wrapped around the outer surface of the cable core (1); the isolation layer (14) is wrapped around the outer surface of the anti-corrosion inner layer (13); and the anti-corrosion outer layer (15) is wrapped around the outer surface of the isolation layer (14).

4. The water-tree-resistant and corrosion-resistant medium-voltage power cable according to claim 1, characterized in that: The composite anti-water treeing layer (6) comprises a reinforcing layer (16) and a waterproof and breathable layer (17); the reinforcing layer (16) is wrapped around the outer surface of the composite corrosion-resistant layer (5); and the waterproof and breathable layer (17) is wrapped around the outer surface of the reinforcing layer (16).

5. The water-tree-resistant and corrosion-resistant medium-voltage power cable according to claim 1, characterized in that: A plurality of steel wires (18) distributed in an annular shape are provided inside the armor layer (7).

6. The water-tree-resistant and corrosion-resistant medium-voltage power cable according to claim 1, characterized in that: The thickness of the outer sheath (8) is greater than the thickness of the composite corrosion-resistant layer (5), and the thickness of the outer sheath (8) is greater than the thickness of the composite anti-water treeing layer (6).

7. The water-tree-resistant and corrosion-resistant medium-voltage power cable according to claim 2, characterized in that: Glass fiber tapes are filled between the aluminum alloy monofilaments (9).

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