A shielding structure for a 35kV cable

Abstract

This utility model relates to the field of cable technology, specifically to a shielding layer structure for a 35kV cable. It includes a cable assembly comprising an outer sheath, within which a shielding layer is disposed, and within the shielding layer a conductor. A protective assembly, disposed on the outer sheath, includes a protective element, which includes armor located within the outer sheath. An inner sheath is disposed within the armor, and a buffer layer is disposed within the shielding layer. By providing a fire-retardant layer on the cable, flames can be prevented from eroding the internal structure of the cable, preventing damage during a fire and avoiding short circuits caused by insulation failure. The buffer layer also absorbs and disperses mechanical stress generated during bending and dragging, preventing stress concentration that could lead to cracks or damage to vulnerable structures such as the internal insulation layer and shielding layer.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a shielding layer structure for a 35kV cable. Background Technology

[0002] 35kV cable is a power cable with a rated voltage of 35 kV. It is used for the transmission and distribution of electrical energy at the 35kV voltage level in power systems. It enables the safe and stable transmission of electrical energy in medium-voltage power systems, ensuring that power is efficiently transmitted from the generation end or substation to the power consumption end, and meeting the needs of large-scale power consumption.

[0003] In the prior art, a 35kV and below shallow water corrosion-resistant and water-blocking single-core cable with patent publication number 201921767696.5 includes a conductor, the conductor having an overall tile-like structure, a conductor shielding layer wrapped around the conductor shielding layer, an insulation layer wrapped around the insulation layer, an insulation shielding layer wrapped around the insulation shielding layer, a semiconductor water-blocking tape wrapped around the insulation shielding layer, an inner lining layer wrapped around the semiconductor water-blocking tape, and a corrugated copper sheath wrapped around the inner lining layer. This 35kV and below shallow water corrosion-resistant and water-blocking single-core cable not only solves the problem of increased DC resistance of the conductor at 20°C after stranding the semi-conductive water-blocking tape, but also has multiple water-blocking and anti-corrosion protections, resulting in high water-blocking and anti-corrosion performance. Without the protection of a fireproof structure, cables are easily burned by flames, leading to cable damage, which in turn causes short circuits and power outages. This not only interrupts the normal power supply to the facilities, but may also produce toxic and harmful gases due to cable combustion, threatening the surrounding environment and personnel safety. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a shielding layer structure for a 35kV cable, which can effectively solve the problem that the existing cable lacks fire-resistant structure protection and is easily burned by flames, resulting in cable damage.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a shielding layer structure for a 35kV cable, including a cable assembly, including an outer sheath, a shielding layer disposed inside the outer sheath, and a conductor disposed inside the shielding layer; A protective component, disposed on the outer sheath, includes a protective element, the protective element including armor, the armor being located inside the outer sheath, an inner sheath being disposed inside the armor, and a buffer layer being disposed inside the shielding layer.

[0006] Furthermore, the protective component also includes an auxiliary component, which includes a waterproof layer that is fitted over the outer side of the outer sheath.

[0007] Furthermore, a filling layer is provided inside the inner sheath, and the filling layer is located outside the shielding layer.

[0008] Furthermore, an anti-corrosion layer is provided within the filling layer, and a fire-retardant layer is provided within the anti-corrosion layer, with the fire-retardant layer sleeved on the outside of the shielding layer.

[0009] Furthermore, a main insulating layer is provided within the shielding layer, and the buffer layer is located within the main insulating layer.

[0010] Furthermore, there are two shielding layers, one of which is sleeved on the outside of the conductor and the other of the main insulation layer.

[0011] Furthermore, the buffer layer is made of a soft material, such as rubber, which has good flexibility, elasticity and aging resistance, and the waterproof layer is made of polyethylene, which has excellent water resistance and chemical stability.

[0012] Furthermore, the fire-resistant layer uses mica tape, which is made by bonding and baking mica paper and reinforcing materials. It has good fire resistance and insulation properties. The anti-corrosion layer uses polyvinyl chloride anti-corrosion tape, which has good chemical stability and mechanical properties and can be tightly wrapped around the cable.

[0013] The technical solution provided by this utility model has the following beneficial effects compared with the known prior art: by setting a fire-resistant layer on the cable, it can prevent flames from burning the internal structure of the cable, prevent the cable from being damaged in a fire, and avoid cable short circuits caused by insulation failure.

[0014] The buffer layer can also absorb and disperse the mechanical stress generated by the cable during bending and dragging, avoiding stress concentration that could cause cracks or damage to vulnerable structures such as the internal insulation layer and shielding layer. Attached Figure Description

[0015] 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 based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the filling layer of this utility model; Figure 3 This is a schematic diagram of the anti-corrosion layer of this utility model; Figure 4This is a schematic diagram of the buffer layer of this utility model; The labels in the diagram represent: 1. Cable assembly; 11. Outer sheath; 12. Shielding layer; 13. Conductor; 2. Protective assembly; 21. Protective component; 211. Armor; 212. Inner sheath; 213. Buffer layer; 22. Auxiliary component; 221. Waterproof layer; 222. Filler layer; 223. Anti-corrosion layer; 224. Fire-retardant layer; 225. Main insulation layer. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] The present invention will be further described below with reference to the embodiments.

[0019] Example: A shielding layer structure for a 35kV cable, see attached figure. Figure 1 - Appendix Figure 4 ,include, The cable assembly 1 includes an outer sheath 11, a shielding layer 12 inside the outer sheath 11, and a conductor 13 inside the shielding layer 12.

[0020] The outer sheath 11 provides physical protection for the internal shielding layer 12 and conductor 13 of the cable, resisting external mechanical damage, chemical corrosion, and moisture intrusion, ensuring the overall structural stability and service life of the cable. The shielding layer 12 is used to eliminate or reduce the interference of the electromagnetic field generated by the conductor 13 inside the cable when it is energized, and at the same time prevent the external electromagnetic field from affecting the internal signal or current transmission of the cable, ensuring the stable transmission performance of the cable. The conductor 13, as the core conductive component of the cable, mainly transmits electrical energy, delivering power from one end to the other, and is a key structure for realizing the power transmission function of the cable.

[0021] The protective component 2 is disposed on the outer sheath 11 and includes a protective element 21. The protective element 21 includes an armor 211, which is located inside the outer sheath 11. An inner sheath 212 is disposed inside the armor 211, and a buffer layer 213 is disposed inside the shielding layer 12.

[0022] The armor 211 is located inside the outer sheath 11 and is used to enhance the mechanical strength of the cable, resist mechanical damage such as external compression, tension, and impact, and protect the internal inner sheath 212, shielding layer 12 and other structures. It is suitable for complex laying environments. The inner sheath 212 is set inside the armor 211 and is used to isolate the armor from the internal shielding layer 12 and other structures, preventing the armor 211 from causing wear to internal components. At the same time, it helps to block the intrusion of moisture and impurities, further protecting the core internal structure of the cable. The buffer layer 213 is located inside the shielding layer 12 and can absorb the stress generated by cable bending, vibration or thermal expansion and contraction, preventing the shielding layer 12 and other internal structures from being damaged due to stress concentration. At the same time, it helps to maintain the interlayer fit and ensure the stability of the cable structure.

[0023] Specifically, the protective component 2 also includes an auxiliary component 22, which includes a waterproof layer 221, which is fitted onto the outside of the outer sheath 11.

[0024] The waterproof layer 221 is fitted on the outside of the outer sheath 11 to prevent external moisture from penetrating into the cable, avoid moisture erosion of the cable's internal structure, prevent the cable's insulation performance from deteriorating due to moisture intrusion, further enhance the cable's water-blocking protection capability in humid or water-infested environments, and ensure the long-term stable operation of the cable.

[0025] Furthermore, a filling layer 222 is provided inside the inner sheath 212, and the filling layer 222 is located outside the shielding layer 12.

[0026] The filler layer 222 is located outside the shielding layer 12 and inside the inner sheath 212. It is used to fill the gaps between the layers inside the cable, making the cable structure more compact and stable, preventing internal components from shaking or shifting due to gaps, and also helping to buffer mechanical stress and improve the overall roundness of the cable.

[0027] Preferably, an anti-corrosion layer 223 is provided inside the filling layer 222, and a fire-retardant layer 224 is provided inside the anti-corrosion layer 223, with the fire-retardant layer 224 sleeved on the outside of the shielding layer 12.

[0028] The anti-corrosion layer 223 resists the intrusion of chemical corrosive substances in the external environment, protects the inner fire-resistant layer 224 and shielding layer 12 from corrosion, and extends the service life of the cable. The fire-resistant layer 224 is sleeved on the outside of the shielding layer 12, which can block the spread of flames and block the transmission of high temperature in the event of a fire, protect the key structures inside the cable from rapid burning, delay cable failure, and reduce the impact of fire on power transmission.

[0029] It should be noted that a main insulating layer 225 is provided inside the shielding layer 12, and a buffer layer 213 is located inside the main insulating layer 225.

[0030] The buffer layer 213 is located inside the main insulation layer 225. It is used to absorb the stress generated by cable bending, vibration and thermal expansion and contraction, and to prevent the main insulation layer from cracking or being damaged due to stress concentration. At the same time, it helps to maintain the fit between the main insulation layer and the internal structure and protect the integrity of the main insulation layer.

[0031] Furthermore, there are two shielding layers 12, one on the outside of the conductor 13 and the other on the outside of the main insulation layer 225.

[0032] By setting two shielding layers 12, the electric field distribution on the surface of the conductor 13 can be made more uniform, thereby reducing electromagnetic interference. Together with the shielding layer 12 sleeved on the outside of the main insulation layer 225, it collects the induced charge on the surface of the main insulation layer, eliminates electric field distortion, and assists in the conduction of fault current, forming a double protection to comprehensively improve the electrical performance and operational safety of the cable.

[0033] Specifically, the buffer layer 213 is made of soft materials, such as rubber, which has good flexibility, elasticity and aging resistance, while the waterproof layer 221 is made of polyethylene material, which has excellent water resistance and chemical stability.

[0034] The buffer layer 213 is made of rubber material. With its good flexibility, elasticity and aging resistance, it can absorb the stress generated by cable bending, vibration or thermal expansion and contraction, protect the internal structure from mechanical damage and maintain long-term stability. The waterproof layer 221 is made of polyethylene material. With its excellent water resistance and chemical stability, it can effectively block the intrusion of external moisture and chemicals, protect the internal structure of the cable from corrosion and ensure the normal operation of the cable in humid or corrosive environments.

[0035] Preferably, the fire-resistant layer 224 is made of mica tape, which is made of mica paper and reinforcing materials, bonded and baked, and has good fire resistance and insulation. The anti-corrosion layer 223 is made of polyvinyl chloride anti-corrosion tape, which has good chemical stability and mechanical properties and can be tightly wrapped around the cable.

[0036] The fire-resistant layer 224 uses mica tape with good fire resistance and insulation, which can block the spread of flames and block high temperature in the event of a fire, protect the internal structure of the cable from rapid burning, and maintain insulation performance. The anti-corrosion layer 223 uses polyvinyl chloride anti-corrosion tape with good chemical stability and mechanical properties. By tightly wrapping the cable, it resists the erosion of external chemical corrosive substances, protects the internal fire-resistant layer 224 and shielding layer 12 and other structures, and improves the corrosion resistance of the cable.

[0037] When in use, the 35kV cable is laid along a preset path. During the laying process, the outer sheath 11 first resists external mechanical friction and collision, protecting the internal armor 211, inner sheath 212 and other structures from damage. The armor 211, with its excellent mechanical strength, further buffers the tensile and compressive forces during laying, preventing the inner sheath 212 from cracking. The waterproof layer 221 is made of polyethylene material, which tightly wraps the outside of the outer sheath 11, effectively blocking the penetration of moisture in the soil and air, and preventing moisture from entering the cable and affecting its insulation performance.

[0038] When the cable is energized, the conductor 13 inside the cable, as the core conductive component, undertakes the important task of transmitting 35kV electrical energy. The shielding layer 12 wrapped around the outside of the conductor 13 can make the electric field distribution on the surface of the conductor 13 more uniform, thereby reducing electromagnetic interference. It can effectively reduce the impact of external electromagnetic interference on the cable's power transmission process, and at the same time reduce the impact of electromagnetic interference generated by the cable itself on the external environment.

[0039] The main insulation layer 225 ensures the insulation isolation between the conductor 13 and the external structure to prevent leakage. The other shielding layer 12 outside the main insulation layer 225 collects the induced charge on the surface of the main insulation layer 225, eliminates electric field distortion, and assists in the conduction of fault current. The double shielding layers 12 work together to ensure the stability of the cable's electrical performance and prevent external electromagnetic interference or internal electromagnetic radiation.

[0040] When the cable is subjected to bending, vibration or changes in ambient temperature, the buffer layer 213 is made of soft materials such as rubber to absorb and disperse the mechanical stress and thermal expansion and contraction stress generated, preventing the main insulation layer 225 and the shielding layer 12 from cracking or being damaged due to stress concentration, and maintaining the interlayer adhesion; the filling layer 222 fills the gaps inside the cable, making the overall structure more compact and preventing the layers from shaking or shifting.

[0041] In the event of a fire, the fire-resistant layer 224 uses mica tape, which, with its excellent fire resistance and insulation, blocks flame erosion and high-temperature transmission, delays the failure of the cable's internal structure, and prevents the conductor 13 and shielding layer 12 from being directly exposed to flames, thus avoiding short circuits and power outages. It also reduces the generation of toxic and harmful gases. In a corrosive environment, the anti-corrosion layer 223 uses polyvinyl chloride anti-corrosion tape, which tightly wraps the cable to resist the erosion of chemical corrosive substances, protects the fire-resistant layer 224, shielding layer 12, and other structures, extends the service life of the cable, and ensures the stable transmission and distribution of power by the 35kV cable under different operating conditions throughout the entire process.

[0042] In summary, the shielding structure of this 35kV cable, by setting a fire-resistant layer 224 on the cable, can prevent flames from burning the internal structure of the cable, prevent the cable from being damaged in a fire, avoid cable short circuits caused by the failure of the main insulation layer 225, and the buffer layer 213 can also absorb and disperse the mechanical stress generated by the cable during bending and dragging, avoiding stress concentration that could cause cracks or damage to the vulnerable structure of the cable.

[0043] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A shielding layer structure for a 35kV cable, characterized in that, The cable assembly (1) includes an outer sheath (11), a shielding layer (12) is provided inside the outer sheath (11), and a conductor (13) is provided inside the shielding layer (12). The protective component (2) is disposed on the outer sheath (11) and includes a protective element (21). The protective element (21) includes an armor (211). The armor (211) is located inside the outer sheath (11). An inner sheath (212) is disposed inside the armor (211). A buffer layer (213) is disposed inside the shielding layer (12).

2. A shield structure for a 35 kV cable according to claim 1, characterized in that The protective component (2) also includes an auxiliary component (22), which includes a waterproof layer (221) and is fitted over the outer side of the outer sheath (11).

3. A 35 kV cable shielding layer structure according to claim 2, characterized in that, The inner sheath (212) is provided with a filling layer (222), which is located outside the shielding layer (12).

4. A 35 kV cable shielding layer structure according to claim 3, characterized in that, The filling layer (222) is provided with an anti-corrosion layer (223), and the anti-corrosion layer (223) is provided with a fire-resistant layer (224), which is sleeved on the outside of the shielding layer (12).

5. A 35 kV cable shielding layer structure according to claim 4, characterized in that, The shielding layer (12) is provided with a main insulating layer (225), and the buffer layer (213) is located inside the main insulating layer (225).

6. A 35 kV cable shielding layer structure according to claim 5, characterized in that, There are two shielding layers (12). The shielding layer (12) is sleeved on the outside of the conductor (13) and on the outside of the main insulation layer (225).

7. A 35 kV cable shielding layer structure according to claim 6, characterized in that, The buffer layer (213) is made of soft material, such as rubber, which has good flexibility, elasticity and aging resistance. The waterproof layer (221) is made of polyethylene material, which has excellent water resistance and chemical stability.

8. A 35 kV cable shielding layer structure according to claim 7, characterized in that, The fire-resistant layer (224) is made of mica tape, which is made of mica paper and reinforcing material, bonded and baked, and has good fire resistance and insulation. The anti-corrosion layer (223) is made of polyvinyl chloride anti-corrosion tape, which has good chemical stability and mechanical properties and can be tightly wrapped on the cable.

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