Waterproof medium voltage power cable

Abstract

The utility model relates to power cable technical field discloses a waterproof medium voltage power cable, including cable body, the cable body inside is provided with the core, the core outer wall is fixedly connected with waterproof adhesive layer, waterproof adhesive layer outer wall is fixedly connected with insulating layer, insulating layer outer wall is fixedly connected with water blocking tape, water blocking tape outer wall is fixedly connected with the armour layer, the armour layer outer wall is fixedly connected with the outer sheath, the cable body inside is fixedly connected with the reinforcing core, the cable body is combined by the core, waterproof adhesive layer, insulating layer, water blocking tape, armour layer and outer sheath. In the utility model, through water blocking tape swelling active sealing when meeting water, waterproof adhesive layer fills the gap, hydrophobic fibre layer guides moisture, forms dynamic waterproof barrier. The armour layer enhances the compression resistance, the outer sheath is corrosion -resistant, the overall structure still can keep the insulation stability under the immersion or humid environment, prolongs life more than 30%, is applicable to the underground pipe gallery, the harsh environment such as coastal.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and in particular to a waterproof medium-voltage power cable. Background Technology

[0002] In urban power grids and industrial power transmission systems, medium-voltage power cables serve as a crucial carrier for transmitting 10kV to 35kV electrical energy, and are widely used in underground utility tunnels, coastal facilities, and various high-humidity environments. As infrastructure expands into more complex and harsh environments, higher demands are placed on the environmental resistance of the cables themselves, particularly in terms of waterproofing, pressure resistance, and corrosion resistance. Therefore, effectively improving the long-term stability and insulation performance of medium-voltage cables in humid, waterlogged, or high-salt-spray environments has become an important research direction in cable manufacturing and application.

[0003] Existing medium-voltage power cables typically consist of a conductor, insulation layer, metallic shielding layer, inner sheath, and outer sheath. Common structural measures include adding ordinary fillers to the outer sheath, using physical wrapping to isolate moisture, or applying a surface coating to delay water penetration. These technologies are usually based on the principle of passive protection, relying on the physical barrier capabilities of the materials themselves to mitigate the impact of external moisture on the cable's internal insulation system. Simultaneously, some structures incorporate a metallic armor layer to enhance mechanical strength and resist a certain degree of compression and corrosion. However, most of these methods are at risk of failure under conditions of prolonged immersion, high humidity in coastal environments, or sudden water seepage, making it difficult to achieve consistently reliable waterproof performance.

[0004] However, existing technologies still generally suffer from the following problems: When cables are exposed to underground pipe racks or high-humidity coastal environments for extended periods, traditional structures typically lack active sealing capabilities. Once moisture penetrates the outer sheath or intrudes along the microchannels of the cable core, it easily leads to moisture absorption and aging of the insulation layer, thereby inducing breakdown faults and severely impacting power supply stability and cable lifespan. Especially under dynamic water conditions or in structural gaps, traditional waterproofing mechanisms cannot achieve dynamic response, resulting in unstable sealing performance and insufficient overall protection reliability. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a waterproof medium-voltage power cable, which aims to improve the traditional structure, which usually lacks active sealing capability. Once moisture penetrates the outer sheath or enters along the microchannels of the cable core, it can easily lead to moisture absorption and aging of the insulation layer, thereby inducing breakdown faults and seriously affecting power supply stability and cable life.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a waterproof medium-voltage power cable, comprising a cable body, wherein a wire core is disposed inside the cable body, a waterproof adhesive layer is fixedly connected to the outer wall of the wire core, an insulation layer is fixedly connected to the outer wall of the waterproof adhesive layer, a water-blocking tape is fixedly connected to the outer wall of the insulation layer, an armor layer is fixedly connected to the outer wall of the water-blocking tape, an outer sheath is fixedly connected to the outer wall of the armor layer, and a reinforcing core is fixedly connected inside the cable body.

[0007] As a further description of the above technical solution:

[0008] The cable body is composed of a wire core, a waterproof adhesive layer, an insulation layer, a water-blocking tape, an armor layer, and an outer sheath.

[0009] As a further description of the above technical solution:

[0010] The core contains a conductor, the outer wall of which is fixedly connected to a conductor shielding layer, and the outer wall of which is fixedly connected to an inner sheath.

[0011] As a further description of the above technical solution:

[0012] The water-blocking strip is a layer of water-swellable polymer material.

[0013] As a further description of the above technical solution:

[0014] The waterproof adhesive layer is an asphalt adhesive filler layer with a thickness of 0.5-1mm.

[0015] As a further description of the above technical solution:

[0016] The outer sheath surface is provided with spiral drainage grooves.

[0017] As a further description of the above technical solution:

[0018] The armor layer is made of galvanized steel strips wrapped around the armor with gaps, and the gap ratio is ≤15%.

[0019] As a further description of the above technical solution:

[0020] The insulation layer is made of cross-linked polyethylene with a thickness of ≥4.5mm.

[0021] This utility model has the following beneficial effects:

[0022] In this invention, a dynamic waterproof barrier is formed by the active sealing effect of water-blocking tape that expands upon contact with water, a waterproof adhesive layer that fills gaps, and a hydrophobic fiber layer that diverts moisture. The armor layer enhances compressive strength, the outer sheath is corrosion-resistant, and the overall structure maintains insulation stability even in immersion or humid environments, extending its lifespan by more than 30%. It is suitable for harsh environments such as underground utility tunnels and coastal areas. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a waterproof medium-voltage power cable proposed in this utility model;

[0024] Figure 2 This utility model provides a cross-sectional view of the cable body of a waterproof medium-voltage power cable.

[0025] Figure 3 This is a cross-sectional view of the conductor of a waterproof medium-voltage power cable proposed in this utility model.

[0026] Legend:

[0027] 1. Cable body; 2. Waterproof adhesive layer; 3. Insulation layer; 4. Water-blocking tape; 5. Armor layer; 6. Outer sheath; 7. Reinforcing core; 8. Wire core; 9. Conductor; 10. Conductor shielding layer; 11. Inner sheath. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Reference Figures 1-3This utility model provides an embodiment of a waterproof medium-voltage power cable, comprising a cable body 1, inside which a conductor 8 is disposed, serving as the main path for carrying current signals and ensuring effective power transmission; a waterproof adhesive layer 2 is fixedly connected to the outer wall of the conductor 8, the waterproof adhesive layer 2 filling the gap between the conductor 8 and the insulation layer 3, effectively preventing moisture penetration and improving the overall waterproof sealing performance; an insulation layer 3 is fixedly connected to the outer wall of the waterproof adhesive layer 2, the insulation layer 3 providing electrical insulation isolation to prevent the potential of the conductor 9 from leaking outward, ensuring... To ensure the safe operation of the cable, a water-blocking strip 4 is fixedly connected to the outer wall of the insulation layer 3. The water-blocking strip 4 is a water-swellable polymer material wrapping layer, possessing water-swellable properties. When damp or water enters the cable, it can quickly expand to seal gaps, forming a three-dimensional sealing barrier to prevent further diffusion of moisture into the cable's interior. An armor layer 5 is fixedly connected to the outer wall of the water-blocking strip 4. The armor layer 5 is a galvanized steel strip with a gap wrapping structure, with a gap ratio ≤15%. This enhances the cable's resistance to mechanical forces, maintaining structural integrity even under pressure, impact, and other loads, preventing cable deformation and damage. The outer sheath 6 is fixedly connected to the outer wall of the armor layer 5. The surface of the outer sheath 6 is provided with a spiral drainage groove, which has good wear resistance and corrosion resistance. The spiral groove guides the accumulated water to drain quickly, reducing the risk of moisture adhesion and further enhancing the environmental adaptability of the cable. A reinforcing core 7 is fixedly connected inside the cable body 1. The reinforcing core 7 is used to improve the longitudinal tensile strength of the overall cable and prevent excessive deformation during laying or operation. The cable body 1 is composed of a wire core 8, a waterproof adhesive layer 2, an insulation layer 3, a water-blocking tape 4, an armor layer 5, and an outer sheath 6. The various layers of the structure work together to form a multi-layered sealed protection system. A conductor 9 is installed inside the core 8. This conductor 9 is the current-carrying material of the cable and is made of highly conductive material to ensure efficient and stable current transmission. A conductor shielding layer 10 is fixedly connected to the outer wall of the conductor 9. This conductor shielding layer 10 is used to suppress electromagnetic interference, prevent electric field leakage, and improve transmission quality. An inner sheath 11 is fixedly connected to the outer wall of the conductor shielding layer 10. This inner sheath 11 is used to fix and wrap the conductor shielding layer 10, further enhancing the overall stability and protective effect of the internal structure.

[0030] Working principle: When the cable exterior comes into contact with moisture, the outer sheath 6 first guides away most of the surface moisture; a small amount of seeping moisture quickly diffuses to non-critical areas; if moisture continues to penetrate, the water-blocking strip 4 expands upon contact with water, blocking the longitudinal seepage path, while the waterproof adhesive layer 2 bonds the gaps between the layers to form a seal; the armor layer 5 resists mechanical stress and prevents the waterproof structure from cracking. This multi-layered protection keeps the conductor 8 and insulation layer 3 in a dry environment, ensuring the long-term safe operation of 10kV-35kV medium-voltage power transmission.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waterproof medium-voltage power cable, comprising a cable body (1), characterized in that: The cable body (1) is provided with a wire core (8) inside. A waterproof adhesive layer (2) is fixedly connected to the outer wall of the wire core (8). An insulation layer (3) is fixedly connected to the outer wall of the waterproof adhesive layer (2). A water-blocking tape (4) is fixedly connected to the outer wall of the insulation layer (3). An armor layer (5) is fixedly connected to the outer wall of the water-blocking tape (4). An outer sheath (6) is fixedly connected to the outer wall of the armor layer (5). A reinforcing core (7) is fixedly connected inside the cable body (1).

2. The waterproof medium-voltage power cable according to claim 1, characterized in that: The cable body (1) is composed of a wire core (8), a waterproof adhesive layer (2), an insulation layer (3), a water-blocking tape (4), an armor layer (5), and an outer sheath (6).

3. A waterproof medium-voltage power cable according to claim 1, characterized in that: The core (8) has a conductor (9) inside, and a conductor shielding layer (10) is fixedly connected to the outer wall of the conductor (9). An inner sheath (11) is fixedly connected to the outer wall of the conductor shielding layer (10).

4. A waterproof medium-voltage power cable according to claim 1, characterized in that: The water-blocking strip (4) is a water-swellable polymer material wrapping layer.

5. A waterproof medium-voltage power cable according to claim 1, characterized in that: The waterproof adhesive layer (2) is an asphalt adhesive filler layer with a thickness of 0.5-1mm.

6. A waterproof medium-voltage power cable according to claim 1, characterized in that: The outer sheath (6) has a spiral drainage groove on its surface.

7. A waterproof medium-voltage power cable according to claim 1, characterized in that: The armor layer (5) is a galvanized steel strip wrapped around the armor layer with a gap ratio of ≤15%.

8. A waterproof medium-voltage power cable according to claim 1, characterized in that: The insulating layer (3) is made of cross-linked polyethylene with a thickness of ≥4.5mm.

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