Cable with good moisture-proof effect for smart grid

Abstract

This utility model discloses a smart grid cable with good moisture-proof performance, comprising a cable body. The cable body, from the inside out, is provided with a conductor, an inner insulation layer, a first moisture-proof layer, a shielding layer, a second moisture-proof layer, an outer insulation layer, and a protective layer. The conductor is wrapped with the inner insulation layer, the first moisture-proof layer is disposed outside the inner insulation layer, the second moisture-proof layer is wrapped with the outer insulation layer, and the outer insulation layer is disposed outside the outer insulation layer. This utility model relates to the field of smart grid cable technology. This smart grid cable with good moisture-proof performance adopts a double-layer moisture-proof design with a first moisture-proof layer and a second moisture-proof layer. The nano-level silica composite coating of the first moisture-proof layer forms a dense barrier, while the aluminum-plastic composite tape and water-absorbing resin layer of the second moisture-proof layer provide dual protection through barrier and absorption, synergistically preventing moisture intrusion. The moisture-proof effect is significantly improved compared to traditional cables, enabling it to adapt to long-term operation in high-humidity environments.

Description

Technical Field

[0001] This utility model relates to the field of smart grid cable technology, specifically a smart grid cable with good moisture resistance. Background Technology

[0002] As a core component of modern power systems, smart grids impose stringent requirements on the security, stability, and reliability of power transmission. As a key carrier of power transmission, the operating status of cables directly determines the overall operating efficiency of smart grids. In practical applications, cables used in smart grids often face complex laying environments, such as damp underground soil areas, high-humidity spaces inside tunnels, and rainy and foggy outdoor areas. Moisture in these environments can easily penetrate the cable surface into the internal structure.

[0003] Existing smart grid cables mostly rely on a single insulation layer for moisture protection. This type of moisture-proof design has obvious defects: on the one hand, the insulation layer is prone to aging and cracking when exposed to a humid environment for a long time, which leads to the gradual failure of its moisture-proof ability. After moisture enters, it will reduce the insulation performance of the cable and cause faults such as short circuits and leakage, which will not only cause power transmission interruption, but may also induce safety accidents. On the other hand, traditional cables lack targeted moisture-proof structural optimization and cannot meet the long-term moisture protection requirements in high humidity environments. Frequent fault repairs not only increase the operation and maintenance costs of smart grids, but also affect the continuity of power supply.

[0004] Therefore, this utility model provides a smart grid cable with good moisture resistance to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a smart grid cable with good moisture resistance, thus solving the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a smart grid cable with good moisture-proof performance, comprising a cable body, wherein the cable body is provided with a conductor, an inner insulation layer, a first moisture-proof layer, a shielding layer, a second moisture-proof layer, an outer insulation layer, and a protective layer from the inside out; the conductor is wrapped with an inner insulation layer, the inner insulation layer is provided with a first moisture-proof layer outside the inner insulation layer, the first moisture-proof layer is wrapped with a shielding layer outside the first moisture-proof layer, the shielding layer is provided with a second moisture-proof layer outside the shielding layer, the second moisture-proof layer is wrapped with an outer insulation layer outside the second moisture-proof layer, and the outer insulation layer is provided with a protective layer outside the outer insulation layer.

[0007] Furthermore, the first moisture-proof layer adopts a nano-scale silica composite coating, which is uniformly coated on the outside of the inner insulation layer through a coating process, and the coating thickness is 0.1-0.3mm.

[0008] Furthermore, the second moisture-proof layer includes an aluminum-plastic composite tape and a water-absorbing resin layer. The aluminum-plastic composite tape is wrapped around the outside of the shielding layer by overlapping and winding, with an overlap width of 1 / 3 to 1 / 2 of the width of the aluminum-plastic composite tape. The water-absorbing resin layer is disposed between the aluminum-plastic composite tape and the outer insulation layer. The water-absorbing resin layer is made of high-molecular water-absorbing resin material and has a thickness of 0.2-0.5 mm.

[0009] Furthermore, the protective layer is made of high-density polyethylene material, and anti-aging agents and ultraviolet absorbers are added inside the protective layer; the amount of anti-aging agent added is 0.5-1% of the mass of high-density polyethylene material, and the amount of ultraviolet absorber added is 0.3-0.8% of the mass of high-density polyethylene material.

[0010] Furthermore, both the inner and outer insulation layers are made of cross-linked polyethylene material.

[0011] Furthermore, the shielding layer is made of copper wire braided with a braiding density of not less than 90%.

[0012] Beneficial effects

[0013] This invention provides a smart grid cable with good moisture resistance. Compared with the prior art, it has the following advantages:

[0014] 1. This smart grid cable with good moisture-proof performance adopts a double-layer moisture-proof design with a first moisture-proof layer and a second moisture-proof layer. The nano-level silica composite coating of the first moisture-proof layer forms a dense barrier, while the aluminum-plastic composite tape and water-absorbing resin layer of the second moisture-proof layer achieve dual protection of barrier and absorption, working together to prevent water vapor from entering. The moisture-proof effect is much improved compared with traditional cables, and it can adapt to long-term operation in high-humidity environments.

[0015] 2. This smart grid cable with good moisture resistance is formed by mature processes such as extrusion, braiding, and coating at each layer, resulting in a tight fit without obvious gaps. The cross-linked polyethylene material of the inner and outer insulation layers and the modified high-density polyethylene material of the protective layer all have excellent mechanical strength and anti-aging properties, which can resist external force damage and environmental erosion during laying and operation, and significantly improve structural stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1This is a perspective view of the external structure of this utility model;

[0018] Figure 2 This is an internal overall cross-sectional view of the present invention.

[0019] In the diagram: 1. Cable body; 2. Conductor; 3. Inner insulation layer; 4. First moisture-proof layer; 5. Shielding layer; 6. Second moisture-proof layer; 7. Outer insulation layer; 8. Protective layer. Detailed Implementation

[0020] It should be noted that in the description of the embodiments of this application, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0021] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Reference Figures 1 to 2This application provides a smart grid cable with good moisture resistance. It includes a cable body 1, which, from the inside out, comprises a conductor 2, an inner insulation layer 3, a first moisture-proof layer 4, a shielding layer 5, a second moisture-proof layer 6, an outer insulation layer 7, and a protective layer 8. The conductor 2 is wrapped with the inner insulation layer 3, the first moisture-proof layer 4 is placed outside the inner insulation layer 3, the shielding layer 5 is placed outside the first moisture-proof layer 4, the second moisture-proof layer 6 is placed outside the shielding layer 5, the outer insulation layer 7 is placed outside the second moisture-proof layer 6, and the protective layer 8 is placed outside the outer insulation layer 7. The first moisture-proof layer 4 is a nano-grade silica composite coating, which is uniformly coated on the outside of the inner insulation layer 3 using a coating process, with a coating thickness of 0.1-0.3 mm. The second moisture-proof layer 6 comprises an aluminum-plastic composite tape and a water-absorbing resin layer. The aluminum-plastic composite tape is wrapped around the outside of the shielding layer 5 using an overlapping method, with an overlap width of 1 / 3 to 1 / 2 of the tape width. The water-absorbing resin layer is positioned between the aluminum-plastic composite tape and the outer insulation layer 7, and is made of high-molecular-weight water-absorbing resin material with a thickness of 0.2-0.5 mm. The protective layer 8 is made of high-density polyethylene material, and contains anti-aging agents and ultraviolet absorbers. The amount of anti-aging agent added is 0.5-1% of the mass of the high-density polyethylene material, and the amount of ultraviolet absorber added is 0.3-0.8% of the mass of the high-density polyethylene material. Both the inner insulation layer 3 and the outer insulation layer 7 are made of cross-linked polyethylene material. The shielding layer 5 is woven from copper wire with a weaving density of not less than 90%.

[0023] In this embodiment,

[0024] Preparation steps

[0025] Conductor preparation: Multiple copper wires are twisted together at a set pitch to form conductor 2. During the twisting process, the tension is controlled to be uniform to avoid the copper wires from breaking or loosening.

[0026] Inner insulation layer molding: After heating and melting the cross-linked polyethylene material using an extruder, it is extruded and wrapped around the outside of conductor 2. The extrusion temperature is controlled at 180-200℃. After cooling and shaping, the inner insulation layer 3 is formed.

[0027] First moisture-proof layer coating: Using electrostatic spraying equipment, nano-grade silica composite coating is uniformly sprayed onto the surface of the inner insulation layer 3. After spraying, it is dried in an 80℃ oven for 30 minutes to form the first moisture-proof layer 4.

[0028] Shielding layer weaving: Use a braiding machine to weave copper wires on the outside of the first moisture-proof layer 4 at a set density. During the weaving process, maintain consistent weaving tension to ensure that the braided layer is flat and without any omissions.

[0029] Preparation of the second moisture-proof layer: First, the aluminum-plastic composite tape is wrapped around the outside of the shielding layer 5 in an overlapping and winding manner, and the overlap is sealed by hot pressing at 120℃; then, a high-molecular water-absorbing resin material is coated on the outside of the aluminum-plastic composite tape using a coating process, and after drying at room temperature, a water-absorbing resin layer is formed, which together constitute the second moisture-proof layer 6.

[0030] Outer insulation layer forming: Cross-linked polyethylene material is extruded and wrapped around the outside of the second moisture-proof layer 6 using an extruder at an extrusion temperature of 180-200℃. After cooling and shaping, the outer insulation layer 7 is formed.

[0031] Protective layer molding: High-density polyethylene material with added anti-aging agents and ultraviolet absorbers is put into an extruder and extruded at a temperature of 190-210℃ to wrap the outer side of the outer insulation layer 7. After cooling and shaping, the complete cable body 1 is obtained.

[0032] 3. Performance Testing

[0033] The cable prepared in this embodiment was subjected to performance testing, and the results are as follows:

[0034] Moisture resistance: After being placed in an environment with a temperature of 40℃ and a relative humidity of 95% for 1000 hours, the internal humidity of the cable is ≤30% RH, with no obvious moisture intrusion.

[0035] Insulation performance: Volume resistivity 1.2×10¹ 5 Ω・cm, breakdown field strength ≥25kV / mm;

[0036] Electromagnetic shielding performance: shielding attenuation 45dB;

[0037] Anti-aging performance: After artificial accelerated aging (1000h, temperature 100℃), the tensile strength retention rate of the protective layer is 85%, with no cracking or discoloration;

[0038] Mechanical properties: After bending resistance (bending radius 15 times the cable outer diameter, bending 100 times), there is no damage to any layer, and the conductivity is normal.

[0039] Furthermore, all contents not described in detail in this specification are existing technologies known to those skilled in the art, and all electrical components mentioned in this document are powered by external power supply lines.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cable for smart grid with good moisture resistance, characterized by, The cable body (1) includes a conductor (2), an inner insulation layer (3), a first moisture-proof layer (4), a shielding layer (5), a second moisture-proof layer (6), an outer insulation layer (7), and a protective layer (8) arranged sequentially from the inside to the outside. The conductor (2) is wrapped with an inner insulation layer (3), a first moisture-proof layer (4) is provided on the outside of the inner insulation layer (3), a shielding layer (5) is wrapped on the outside of the first moisture-proof layer (4), a second moisture-proof layer (6) is provided on the outside of the shielding layer (5), an outer insulation layer (7) is wrapped on the outside of the second moisture-proof layer (6), and a protective layer (8) is provided on the outside of the outer insulation layer (7). The first moisture-proof layer (4) adopts a nano-level silica composite coating. The nano-level silica composite coating is uniformly coated on the outside of the inner insulation layer (3) by a coating process, and the coating thickness is 0.1-0.3mm. The second moisture-proof layer (6) includes an aluminum-plastic composite tape and a water-absorbing resin layer. The aluminum-plastic composite tape is wrapped around the outside of the shielding layer (5) by overlapping and winding, with an overlap width of 1 / 3 to 1 / 2 of the width of the aluminum-plastic composite tape. The water-absorbing resin layer is disposed between the aluminum-plastic composite tape and the outer insulation layer (7). The water-absorbing resin layer is made of high-molecular water-absorbing resin material and has a thickness of 0.2-0.5 mm. The protective layer (8) is made of high-density polyethylene material; Both the inner insulation layer (3) and the outer insulation layer (7) are made of cross-linked polyethylene material; The shielding layer (5) is made of copper wire braided with a braiding density of not less than 90%.

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