Abrasion-resistant and corrosion-resistant anti-aging power cable

Abstract

The invention belongs to the technical field of power cables, and particularly relates to a wear-resistant, corrosion-resistant and anti-aging power cable which comprises a conductor and a conductor wrapping layer wrapping the surface of the conductor, and the surface of the conductor wrapping layer is connected with an insulating layer; the surface of the insulating layer is connected with a filling layer, the surface of the filling layer is connected with a shielding layer, the surface of the shielding layer is connected with a braid layer, the surface of the braid layer is connected with a sheath layer made of polyvinyl chloride, a protective plate is connected between the braid layer and the sheath layer, one side of the protective plate is connected with a communication plate, and the other side of the protective plate is connected with a cable. According to the power cable disclosed by the invention, the reinforcing layer which is staggered, woven and inserted into the net is coated in the filling layer, and the armor layer made of an aluminum alloy belt material is tightly coated on the surface of the cable conductor, so that the mechanical protection, corrosion resistance and tensile strength of the cable are improved; and under the condition of underground laying, the interlocking armoring can effectively resist external mechanical impact and abrasion and protect conductors in the cable from being damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of power cables, and in particular relates to a wear-resistant, corrosion-resistant and aging-resistant power cable. Background Art

[0002] Power cables are used to transmit and distribute electrical energy. They are commonly used in urban underground power grids, power station lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. According to voltage levels, they can be divided into medium and low voltage power cables (35 kV and below), high voltage cables (above 110 kV), ultra-high voltage cables (275 kV~800 kV), and ultra-high voltage cables (1000 kV and above). There are also claims that low voltage is 1 kV and below, medium voltage is 6,000~35 kV, high voltage is 66,000~330 kV, and ultra-high voltage is 500 kV and above. According to insulation materials, they can be divided into oil-impregnated paper insulated power cables, plastic insulated power cables (commonly used plastics include polyvinyl chloride, polyethylene, and cross-linked polyethylene), and rubber insulated power cables; Power cables play a key role in urban distribution networks, ensuring that electricity is transmitted from substations to various user ends. They are an important part of urban underground power grids. In residential and commercial buildings, power cables are used for power supply, lighting and electrical equipment connection, and are an indispensable power transmission medium in construction. High-voltage and ultra-high-voltage cables are used for long-distance power transmission, connecting major power stations and regional power grids to achieve long-distance transmission and distribution of electric energy. In wind farms and photovoltaic power stations, power cables are used to transmit electricity generated from renewable energy to the power grid, and are key equipment for achieving renewable energy grid-connected power generation. Anti-aging power cables are special cables designed to address the problem of easy aging of cables in power transmission and distribution systems. Power cables buried underground for a long time are constantly exposed to the penetration and erosion of moisture in the soil and the frequent friction between soil particles and the outer wall of the cable. The surface protective layer often shows obvious signs of corrosion and wear, which not only damages the appearance integrity of the cable, but also poses a potential threat to the conductor and insulation layer inside the cable. What is even more difficult is that at the bends and corners of the cable, the current is unevenly distributed in these areas, which can easily cause eddy current effects. This effect can cause abnormally high temperatures in the bends, far exceeding the normal operating temperature range of the cable, greatly accelerating the aging of the cable material, causing the insulation layer to deteriorate, weakening the mechanical strength, and even causing insulation breakdown or short circuit failures. This series of chain reactions not only significantly shortens the service life of the power cable, but also seriously threatens the stability and safety of the power system, and increases the risk of power failures and maintenance costs. Summary of the invention

[0003] The purpose of the present invention is to provide a wear-resistant and corrosion-resistant anti-aging power cable, which aims to solve the problem in the prior art that when the above-mentioned power cables are used, the power cables buried underground for a long time are constantly subjected to the penetration and erosion of moisture in the soil and the frequent friction between the soil particles and the outer wall of the cable, and their surface protective layers often show obvious corrosion marks and wear phenomena, which not only damages the appearance integrity of the cable, but also may pose a potential threat to the conductor and insulation layer inside the cable. What is more difficult is that at the bends and corners of the cable, due to the uneven distribution of current in these areas, eddy current effects are easily induced, which can cause abnormally high temperatures in the bends of the cable, far exceeding the temperature range of normal operation of the cable, thereby greatly accelerating the aging speed of the cable material, resulting in a decrease in the performance of the insulation layer, a decrease in mechanical strength, and even insulation breakdown or short circuit failures. This series of chain reactions not only significantly shortens the service life of the power cable, but also seriously threatens the stability and safety of the power system, and increases the risk of power failures and maintenance costs.

[0004] To achieve the above object, the present invention provides the following technical solution: a wear-resistant and corrosion-resistant anti-aging power cable, comprising a conductor and a conductor wrapping layer wrapped on the surface of the conductor, wherein the surface of the conductor wrapping layer is connected to an insulating layer; The surface of the insulating layer is connected to a filling layer, the surface of the filling layer is connected to a shielding layer, the surface of the shielding layer is connected to a braided layer, the surface of the braided layer is connected to a sheath layer made of polyvinyl chloride, a guard plate is connected between the braided layer and the sheath layer, one side of the guard plate is connected to a connecting plate, and the inner walls of the guard plate and the connecting plate are both connected to hook blocks.

[0005] As a preferred embodiment of the wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the filling layer is composed of glass fiber rope, wherein a reinforcement layer is embedded in the center of the filling layer, and the reinforcement layer is composed of aluminum alloy strip as an armor layer.

[0006] As a preferred embodiment of the wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the reinforcement layer adopts a mesh structure made of interlaced weaving and interlacing technology, wherein the interlaced weaving and interlacing technology is an interlocking armoring technology.

[0007] As a preferred embodiment of the wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the inner layer of the shielding layer is made of aluminum foil, and the outer layer is a braided metal copper wire structure.

[0008] As a preferred wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the braided layer adopts a multi-layer braided structure, wherein the specific structure of the braided layer adopts a fiber braided layer superimposed on the outside of a metal braided layer, and the inside of the braided layer is composed of a fiber braided layer superimposed on the outside of a metal braided layer.

[0009] As a preferred embodiment of the wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the guard plate and the connecting plate are both made of aluminum, and the curvature of the inner walls of the guard plate and the connecting plate is adapted to the curvature of the surface of the braided layer.

[0010] As a preferred wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the transverse dimension of the protective plate is half of the transverse dimension of the connecting plate. In fact, the protective plate and the connecting plate pass through the interior of the laid cable, and the outer side surfaces of the protective plate and the connecting plate are embedded and connected with the inner side of the sheath layer.

[0011] As a preferred wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the hook block is a boss structure, the surface size of the hook block is smaller than the braided opening size of the braided layer surface, and the hook blocks are circular and evenly distributed on the inner walls of the guard plate and the connecting plate.

[0012] As a preferred embodiment of the wear-resistant, corrosion-resistant and aging-resistant power cable of the present invention, the hook block is embedded in the braided layer and contacts the outermost side of the shielding layer.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The power cable in the present invention is coated with a mesh-shaped reinforcement layer formed by staggered weaving in the filling layer, wherein the armor layer is made of aluminum alloy strip material, which is tightly wrapped around the surface of the cable conductor to improve the mechanical protection, corrosion resistance and tensile strength of the cable. When laid underground, the interlocking armor can effectively resist external mechanical impact and wear, and protect the internal conductor of the cable from damage. In addition, the braided layer on the outside of the power cable adopts a multi-layer braided structure to form a tight mesh structure. At the same time, the guard plate and the connecting plate are passed through the surface of the braided layer of the power cable. At this time, the hook blocks on the inner wall of the guard plate and the connecting plate are hooked and pulled with the tight mesh of the cable braided layer to improve the integrity of the braided layer. At the same time, the overall strength of the power cable is improved to avoid excessive bending angles at the cable when it is laid underground, avoid eddy current phenomena, reduce the aging speed of the cable material, avoid the decline in the mechanical properties and strength of the cable, and improve the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the power cable of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the cable of the present invention; Figure 3 It is a schematic diagram of the filling layer structure of the present invention; Figure 4 It is a schematic diagram of the reinforcement layer structure of the present invention; Figure 5 It is a schematic diagram of the braided layer structure of the present invention; Figure 6 It is a schematic diagram of the hook block structure of the present invention.

[0015] In the figure: 1. conductor; 2. conductor wrapping layer; 3. insulation layer; 4. filling layer; 41. reinforcement layer; 5. shielding layer; 6. braided layer; 61. protective plate; 62. connecting plate; 63. hook block; 7. sheath layer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-6 , the present invention provides the following technical solution: an anti-wear and anti-corrosion anti-aging power cable, comprising a conductor 1 and a conductor wrapping layer 2 wrapped on the surface of the conductor 1, and an insulating layer 3 is connected to the surface of the conductor wrapping layer 2; The surface of the insulating layer 3 is connected to the filling layer 4, the surface of the filling layer 4 is connected to the shielding layer 5, the surface of the shielding layer 5 is connected to the braided layer 6, the surface of the braided layer 6 is connected to the sheath layer 7 made of polyvinyl chloride, a protective plate 61 is connected between the braided layer 6 and the sheath layer 7, one side of the protective plate 61 is connected to a connecting plate 62, and the inner walls of the protective plate 61 and the connecting plate 62 are both connected to hook blocks 63.

[0018] Preferably, the filling layer 4 is made of glass fiber rope, wherein a reinforcement layer 41 is embedded in the center of the filling layer 4, and the reinforcement layer 41 is made of aluminum alloy strip as an armor layer. In order to avoid eddy currents causing heating and loss of the cable, the non-magnetic material of the aluminum alloy strip is used as the armor layer.

[0019] Preferably, the reinforcement layer 41 adopts a mesh structure made of interlaced weaving and interlacing, wherein the interlaced weaving and interlacing technology is an interlocking armor technology. Interlocking armor refers to the use of metal strips, usually aluminum alloy strips or steel strips, through a special processing technology to make them interlaced and woven into a tight mesh structure, tightly wrapped around the cable core wire, and the structure is not only strong and durable, but also has good flexibility and anti-twisting ability.

[0020] Preferably, the inner layer of the shielding layer 5 is made of aluminum foil, and the outer layer is a braided metal copper wire structure. The inner aluminum foil shielding can effectively reflect and isolate most high-frequency electromagnetic interference, and the outer braided shielding can block and attenuate a small amount of high-frequency electromagnetic waves that may penetrate the aluminum foil shielding layer, providing all-round electromagnetic protection for the cable.

[0021] Preferably, the braided layer 6 adopts a multi-layer braided structure, wherein the specific structure of the braided layer 6 adopts a metal braided layer superimposed on the outside of the fiber braided layer, and the inside of the braided layer 6 adopts a metal braided layer superimposed on the outside of the fiber braided layer. It mainly plays the role of enhancing the mechanical strength of the cable, preventing the cable from being damaged by external forces, improving the heat resistance and wear resistance of the cable, and shielding electromagnetic interference.

[0022] Preferably, the guard plate 61 and the connecting plate 62 are both made of aluminum, and the curvature of the inner walls of the guard plate 61 and the connecting plate 62 is adapted to the curvature of the surface of the braided layer 6 .

[0023] By using the protective plate 61 and the connecting plate 62, the overall mechanical strength of the power cable is improved and multiple bends are avoided.

[0024] Preferably, the transverse dimension of the guard plate 61 is half of the transverse dimension of the connecting plate 62. In fact, the guard plate 61 and the connecting plate 62 penetrate the inside of the laid cable, and the outer side surfaces of the guard plate 61 and the connecting plate 62 are engaged with the inner side of the sheath layer 7. By connecting the guard plate 61 and the connecting plate 62, the guard plate 61 and the connecting plate 62 are assembled in a section-by-section connection mode, which is convenient for later cable cutting. In addition, the special shape of the connecting plate 62 can ensure normal heat dissipation of the cable.

[0025] Preferably, the hook block 63 is a boss structure, the surface size of the hook block 63 is smaller than the braided opening size of the braided layer 6 surface, and the hook block 63 is circular and evenly distributed on the inner wall of the guard plate 61 and the connecting plate 62. The hook block 63 on the inner wall of the guard plate 61 and the connecting plate 62 is hooked and pulled with the tight mesh of the cable braided layer 6 to improve the integrity of the braided layer 6 and the overall strength of the power cable, so as to avoid excessive bending angles at the cable when the cable is laid underground, avoid eddy current phenomenon, and reduce the aging speed of the cable material.

[0026] Preferably, the hook block 63 is embedded in the braided layer 6 and contacts the outermost side of the shielding layer 5. The bottom end of the hook block 63 is passed through the mesh of the braided layer 6 and then hooked and pulled, which can ensure the integrity of the braided layer 6, avoid the braided layer 6 from being dispersed inside the power cable, and improve the overall mechanical properties of the power cable.

[0027] The working principle of the power cable in the present invention during specific use: the power cable is coated with a mesh reinforcement layer 41 formed by interlaced weaving in the filling layer 4, wherein the armor layer is made of aluminum alloy strips and tightly wrapped around the surface of the cable conductor 1, thereby improving the mechanical protection, corrosion resistance and tensile strength of the cable. When laid underground, the interlocking armor can effectively resist external mechanical impact and wear, and protect the internal conductor of the cable from damage. In addition, the inner aluminum foil of the shielding layer 5 provides efficient reflection and isolation, and the outer braided layer blocks and attenuates a small amount of electromagnetic waves that penetrate the aluminum foil again. This composite structure performs well in a high-frequency electromagnetic interference environment, and can also be used as The braided layer 6 on the outside of the power cable adopts a multi-layer braided structure to form a tight mesh structure. At the same time, the protective plate 61 and the connecting plate 62 are passed through the surface of the braided layer 6 of the power cable. At this time, the hook blocks 63 on the inner walls of the protective plate 61 and the connecting plate 62 are hooked and pulled with the tight mesh of the cable braided layer 6, thereby improving the integrity of the braided layer 6 and improving the overall strength of the power cable, avoiding excessive bending angles at the cable when it is laid underground, avoiding eddy currents, reducing the aging speed of the cable material, and avoiding a decrease in the mechanical properties and strength of the cable. In addition, the sheath layer 7 made of polyvinyl chloride material enhances the wear resistance of the outer surface of the power cable and improves the service life of the cable.

[0028] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wear-resistant, corrosion-resistant and aging-resistant power cable, comprising a conductor (1) and a conductor wrapping layer (2) wrapped around the surface of the conductor (1), characterized in that: The surface of the conductor wrapping layer (2) is connected to an insulating layer (3); The surface of the insulating layer (3) is connected to a filling layer (4), the surface of the filling layer (4) is connected to a shielding layer (5), the surface of the shielding layer (5) is connected to a braided layer (6), the surface of the braided layer (6) is connected to a sheath layer (7) made of polyvinyl chloride, a protective plate (61) is connected between the braided layer (6) and the sheath layer (7), one side of the protective plate (61) is connected to a connecting plate (62), and the inner walls of the protective plate (61) and the connecting plate (62) are both connected to hook blocks (63).

2. The wear-resistant, corrosion-resistant and aging-resistant power cable according to claim 1, characterized in that: The filling layer (4) is composed of glass fiber ropes, wherein a reinforcement layer (41) is embedded at the center of the filling layer (4), and the reinforcement layer (41) is composed of an aluminum alloy strip as an armor layer.

3. The wear-resistant and corrosion-resistant aging-resistant power cable according to claim 1, characterized in that: The reinforcement layer (41) adopts a mesh structure made of interlaced weaving and interlacing, wherein the interlaced weaving and interlacing technology is an interlocking armor technology.

4. The wear-resistant, corrosion-resistant and aging-resistant power cable according to claim 1, characterized in that: The inner layer of the shielding layer (5) is made of aluminum foil, and the outer layer is a braided metal copper wire structure.

5. The wear-resistant, corrosion-resistant and aging-resistant power cable according to claim 1, characterized in that: The braided layer (6) adopts a multi-layer braided structure, wherein the specific structure of the braided layer (6) adopts a metal braided layer superimposed on the outside of the fiber braided layer, and the inside of the braided layer (6) adopts a metal braided layer superimposed on the outside of the fiber braided layer.

6. The wear-resistant, corrosion-resistant and aging-resistant power cable according to claim 1, characterized in that: The guard plate (61) and the connecting plate (62) are both made of aluminum, and the curvature of the inner walls of the guard plate (61) and the connecting plate (62) is adapted to the curvature of the surface of the braided layer (6).

7. The wear-resistant, corrosion-resistant and aging-resistant power cable according to claim 1, characterized in that: The transverse dimension of the protective plate (61) is half of the transverse dimension of the connecting plate (62); in fact, the protective plate (61) and the connecting plate (62) penetrate the interior of the laid cable, and the outer side surfaces of the protective plate (61) and the connecting plate (62) are engaged and connected with the inner side of the sheath layer (7).

8. The wear-resistant, corrosion-resistant and aging-resistant power cable according to claim 1, characterized in that: The hook block (63) is a boss structure, the surface size of the hook block (63) is smaller than the surface braiding opening size of the braided layer (6), and the hook block (63) is circular and evenly distributed on the inner walls of the guard plate (61) and the connecting plate (62).

9. The wear-resistant, corrosion-resistant and aging-resistant power cable according to claim 1, characterized in that: The hook block (63) is embedded in the braided layer (6) and contacts the outermost side of the shielding layer (5).

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