Composite structure of high-voltage tolerance cable

Abstract

The utility model relates to the technical field of high-voltage cables, and discloses a composite structure of a high-voltage tolerance cable, which comprises a cable body, a protective layer is arranged in the cable body, a metal shielding layer is arranged on the inner wall of the protective layer, a semi-conductive outer shielding layer is arranged on the inner wall of the metal shielding layer, and the semi-conductive outer shielding layer is arranged on the inner wall of the metal shielding layer. The inner wall of the semi-conductive outer shielding layer is provided with the insulating layer, the inner wall of the insulating layer is provided with the semi-conductive inner shielding layer, the semi-conductive inner shielding layer is in close contact with the insulating layer, an air gap between the conductor and the insulating layer is eliminated, the inner wall of the semi-conductive inner shielding layer is provided with the wire core wire, and electric energy loss and voltage drop can be effectively reduced. According to the utility model, through the multi-layer composite structure design, high-efficiency electric energy transmission, electrical safety and operation stability under a high-voltage condition can be ensured, electric energy loss can be reduced, heat dissipation and protection performance can be improved, and long-term stable operation of the cable body under the high-voltage condition can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage cable technology, and in particular to a composite structure for high-voltage withstand cables. Background Technology

[0002] High-voltage cables are power cables used to transmit high-voltage electrical energy. They are commonly used in the transmission and distribution stages of power systems. In order to achieve uniform electric field distribution, reduce partial discharge, prevent insulation breakdown, and avoid electrical accidents, thereby ensuring the efficient, safe, and stable operation of the cable under high-voltage conditions, composite structures of high-voltage withstand cables are used.

[0003] High-voltage withstand cables have a composite structure consisting of multiple layers, each with a specific function, working together to ensure the cable's safe and efficient operation under high-voltage conditions. Current cable technologies may result in high costs and insufficient high-voltage withstand capabilities, potentially leading to overheating and cable burnout. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a composite structure for high-voltage withstand cables, aiming to improve the existing cables' insufficient high-voltage withstand capability and the problem of cables easily burning out due to excessive temperature.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a composite structure for a high-voltage withstand cable, comprising a cable body, an inner protective layer thereof, a metal shielding layer thereof on the inner wall of the protective layer, a semi-conductive outer shielding layer thereof on the inner wall of the metal shielding layer, an insulating layer thereof on the inner wall of the semi-conductive outer shielding layer, and a semi-conductive inner shielding layer thereof on the inner wall of the insulating layer. The semi-conductive inner shielding layer is in close contact with the insulating layer, eliminating the air gap between the conductor and the insulating layer. A conductor core is disposed on the inner wall of the semi-conductive inner shielding layer, which can effectively reduce power loss and voltage drop.

[0006] Preferably, the protective layer is made of silicone rubber and alkali-free glass fiber, which can achieve mechanical protection.

[0007] Preferably, the metal shielding layer is made of corrugated aluminum sleeve, which can achieve electromagnetic shielding.

[0008] Preferably, the semiconductive outer shielding layer is made of ethylene-vinyl acetate copolymer and contains a crosslinking agent.

[0009] Preferably, the insulating layer is made of cross-linked polyethylene, which has good electrical properties.

[0010] Preferably, the semiconductive inner shielding layer is made of semiconductive rubber, which has good insulation properties.

[0011] Preferably, the conductor core is made of copper and has high electrical conductivity.

[0012] This utility model has the following beneficial effects:

[0013] 1. In this utility model, through the multi-layer composite structure design, efficient power transmission, electrical safety and operational stability under high voltage conditions can be ensured. It can not only reduce power loss, but also improve heat dissipation and protection performance, and ensure the long-term stable operation of the cable body under high voltage conditions. Attached Figure Description

[0014] Figure 1 This is a perspective view of the composite structure of the high-voltage withstand cable proposed in this utility model;

[0015] Figure 2 This is a partial structural diagram of the protective layer of the composite structure of the high-voltage withstand cable proposed in this utility model.

[0016] Legend:

[0017] 1. Cable body; 2. Protective layer; 3. Metallic shielding layer; 4. Semi-conductive outer shielding layer; 5. Insulation layer; 6. Semi-conductive inner shielding layer; 7. Conductor core. Detailed Implementation

[0018] 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 embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Reference Figure 1 and Figure 2 This utility model provides an embodiment of a composite structure for a high-voltage withstand cable, comprising a cable body 1, a protective layer 2 disposed inside the cable body 1, a metal shielding layer 3 disposed on the inner wall of the protective layer 2, a semi-conductive outer shielding layer 4 disposed on the inner wall of the metal shielding layer 3, an insulation layer 5 disposed on the inner wall of the semi-conductive outer shielding layer 4, and a semi-conductive inner shielding layer 6 disposed on the inner wall of the insulation layer 5. The semi-conductive inner shielding layer 6 is in close contact with the insulation layer 5, eliminating the air gap between the conductor and the insulation layer 5. A conductor core 7 is disposed on the inner wall of the semi-conductive inner shielding layer 6, which can effectively reduce power loss and voltage drop.

[0020] Specifically, the cable body 1, as the entire composite structure, primarily functions to transmit high-voltage electrical energy, ensuring minimal energy loss during long-distance transmission and transferring energy from the power plant to the substation or user end. The protective layer 2, as the outer layer, prevents moisture and humidity from penetrating the cable body 1, protecting it from external corrosive substances and extending its service life. The metallic shielding layer 3 effectively shields the electromagnetic field inside the cable body 1, preventing electromagnetic interference from affecting external equipment. The semi-conductive outer shielding layer 4 forms a high interface barrier, suppressing the injection and accumulation of space charge, reducing electric field distortion, and extending the life of the cable body 1. The insulation layer 5 prevents current from passing through the outer sheath of the cable body 1 into the surrounding environment or other conductors, thus preventing electrical accidents such as electric shock and short circuits. The semi-conductive inner shielding layer 6 eliminates unevenness and sharp point effects on the conductor surface, uniformly distributing the electric field and preventing excessively high local electric field strength. The conductor core 7 reduces the conductor's resistance, minimizing energy loss during transmission.

[0021] Reference Figure 2 The protective layer 2 is made of silicone rubber and alkali-free glass fiber, which can achieve mechanical protection. The metal shielding layer 3 is made of corrugated aluminum sleeve, which can achieve electromagnetic shielding. The semi-conductive outer shielding layer 4 is made of ethylene-vinyl acetate copolymer and has added crosslinking agent.

[0022] Specifically, the protective layer 2 has insulation, fireproof, flame-retardant, high-temperature resistance, waterproof and low-temperature resistance properties. It can shield electromagnetic interference, eliminate induced electricity, and protect the electric field distribution inside the cable body 1. Under extreme conditions, the protective layer 2 can prevent the spread of fire and protect the insulation performance of the cable body 1. The corrugated aluminum sheath material of the metal shielding layer 3 has good mechanical strength and heat dissipation performance. It can prevent moisture from entering the cable insulation layer 5 and avoid the decrease in insulation performance caused by moisture. At the same time, it can also enhance the mechanical strength of the cable body 1. The crosslinking agent in the semi-conductive outer shielding layer 4 can improve the mechanical properties and stability of the material and provide additional mechanical strength while uniformly distributing the electric field.

[0023] Reference Figure 2 The insulation layer 5 is made of cross-linked polyethylene and has good electrical properties. The semi-conductive inner shielding layer 6 is made of semi-conductive rubber and has good insulation properties. The conductor core 7 is made of copper and has high electrical conductivity.

[0024] Specifically, the cross-linked polyethylene material in the insulation layer 5 has excellent electrical properties, heat resistance, and mechanical strength, and can withstand high voltage and high temperature environments. Through its good heat resistance, it can maintain the stability and reliability of its insulation performance even under long-term operation or large changes in external ambient temperature. The semi-conductive inner shielding layer 6 can inhibit the growth of electrical trees or water trees, extend the service life of the cable body 1, and at the same time, through the thermal resistance temperature distribution effect, reduce the temperature rise of the insulation layer 5, thus playing a role in thermal shielding. The copper in the conductor core 7, as a material with high conductivity, can effectively reduce the resistance of the conductor and reduce the loss during the transmission of electrical energy.

[0025] Working principle: When this composite structure is used, the protective layer 2 can prevent the cable body 1 from being mechanically damaged during laying and operation, providing good protection. Then, the metal shielding layer 3 located inside the protective layer 2 provides electrical grounding protection. Once the insulation layer 5 is broken down, the metal shielding layer 3 can guide the high voltage current to the ground. The semi-conductive outer shielding layer 4 is used to eliminate static electricity between the insulation layer 5 and the metal shielding layer 3, prevent partial discharge, and protect the insulation layer 5. The insulation layer 5 inside the semi-conductive outer shielding layer 4 is the main insulation part of the cable body 1, which can withstand high voltage and prevent current leakage. Then, the semi-conductive inner shielding layer 6 located inside the insulation layer 5 can eliminate static electricity between the insulation layer 5 and the conductor, so that the charge distribution is uniform and prevents partial discharge. Finally, the current is transmitted through the conductor core 7 located in the innermost layer of the cable body 1, which has good conductivity. Through the synergistic effect between the layers, not only can the electrical and mechanical properties of the cable body 1 be improved, but also the heat dissipation and protection performance can be improved, and the installation and maintenance costs can be reduced, thereby ensuring the long-term stable operation of the cable body 1 under high voltage conditions.

[0026] 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. Composite structure of a high-voltage resistant cable comprising a cable body (1), characterized in that: The inner part of the cable body (1) is provided with a protective layer (2), the inner wall of the protective layer (2) is provided with a metal shielding layer (3), the inner wall of the metal shielding layer (3) is provided with a semi-conductive outer shielding layer (4), the inner wall of the semi-conductive outer shielding layer (4) is provided with an insulating layer (5), the inner wall of the insulating layer (5) is provided with a semi-conductive inner shielding layer (6), the semi-conductive inner shielding layer (6) is in close contact with the insulating layer (5), eliminating the air gap between the conductor and the insulating layer (5), and the inner wall of the semi-conductive inner shielding layer (6) is provided with a wire core (7), which can effectively reduce the power loss and voltage drop.

2. The composite construction of a high-voltage resistant power cable according to claim 1, characterized in that: The protective layer (2) is made of silicone rubber and alkali-free glass fiber, which can realize mechanical protection.

3. The composite construction of a high-voltage resistant power cable according to claim 1, characterized in that: The metal shielding layer (3) is made of corrugated aluminum sleeve, which can realize electromagnetic shielding.

4. The composite construction of a high-voltage resistant power cable according to claim 1, characterized in that: The semi-conductive outer shielding layer (4) is made of ethylene-vinyl acetate copolymer and added with a crosslinking agent.

5. The composite construction of a high-voltage resistant power cable according to claim 1, characterized in that: The insulating layer (5) is made of crosslinked polyethylene, which has good electrical properties.

6. The composite construction of a high-voltage resistant power cable according to claim 1, characterized in that: The semi-conductive inner shielding layer (6) is made of semi-conductive rubber, which has good insulation performance.

7. The composite construction of a high-voltage resistant power cable according to claim 1, characterized in that: The wire core (7) is made of copper material, which has high electrical conductivity.

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