Intelligent tensile medium-voltage power cable applied to rivers and lakes

Abstract

The utility model relates to the technical field of power cables, in particular to an intelligent tensile medium-voltage power cable applied to rivers and lakes, which comprises a middle core wire group and an external protection assembly. The middle core wire group is composed of three power core wires located in the center, a core wire shielding layer, an XLPE insulating layer, an insulation shielding layer located on the periphery of the XLPE insulating layer and an inner monitoring shielding layer of a spiral structure. According to the intelligent tensile medium-voltage power cable applied to rivers and lakes, the inner monitoring shielding layer and the outer monitoring shielding layer which are wound in a staggered manner are arranged at the connection position of the middle core wire group and the external protection assembly, so that the tensile and compressive properties of the whole power cable can be greatly improved; the non-metal internal isolation layer is arranged between the inner monitoring shielding layer and the outer monitoring shielding layer, so that the internal isolation under the normal condition can be ensured, the possibility of false alarm is reduced, flow guide can be performed after water invasion, and the internal thermal conductivity can be improved to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to an intelligent tensile-resistant medium-voltage power cable applied to rivers, lakes and reservoirs. Background Art

[0002] With the rise of water photovoltaic and wind power development, offshore aquaculture, offshore islands and inland lake tourism in recent years, people have an increasing demand for power transmission cables between the shores of rivers, lakes and islands. Due to the increase in cable length, medium-voltage cables need to be used with supporting transformers. In addition, the underwater natural environment is unpredictable, which requires that the laid cables not only have special properties such as waterproof leakage and corrosion, resistance to mechanical pulling and external force collision, but also require higher electrical insulation performance and high safety and reliability.

[0003] In order to meet the requirements of laying cables underwater, a series of pressure-resistant and corrosion-resistant cables have appeared on the market. However, these cables can only passively resist pressure and water and corrosion. However, they cannot immediately alarm when water intrusion occurs inside them, and they cannot quickly and accurately determine the location of the water intrusion, resulting in a low level of intelligence. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the pressure-resistant and corrosion-resistant cables on the market can only play a passive role in pressure resistance and waterproof and corrosion resistance, but cannot immediately alarm when water intrusion occurs inside, and cannot quickly and accurately know the location of the water intrusion, resulting in a low degree of intelligence.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an intelligent tensile-resistant medium-voltage power cable applied to rivers, lakes and reservoirs, comprising a central core wire group and an external protection component, the central core wire group is composed of three power core wires located in the center, a core wire shielding layer located on the periphery of the power core wire, an XLPE insulation layer located on the periphery of the core wire shielding layer, an insulation shielding layer located on the periphery of the XLPE insulation layer, a metal shielding layer located on the periphery of the insulation shielding layer and an inner monitoring shielding layer of a spiral structure, an inner lining layer for preventing electrical corrosion is arranged between the central core wire group and the external protection component, and the external protection component is composed of a non-metallic internal isolation layer wrapped around the periphery of the inner monitoring shielding layer, an outer monitoring shielding layer wound around the outside of the non-metallic internal isolation layer, a waterproof inner sheath layer, an isolation water-blocking layer, a waterproof isolation layer, a buffer water-blocking layer, a radial water-blocking layer, an anti-corrosion inner lining layer and a corrosion-resistant outer sheath layer sequentially wrapped around the periphery of the outer monitoring shielding layer from the inside to the outside.

[0006] The inner lining layer is filled with a water-blocking filling layer located outside the power core wire.

[0007] The inner monitoring shielding layer and the outer monitoring shielding layer are wrapped in a gap.

[0008] The non-metal internal isolation layer is provided with internal flow guide holes.

[0009] The widths of the inner monitoring shielding layer and the outer monitoring shielding layer are greater than the winding gap between the inner side surface of the inner monitoring shielding layer and the outer monitoring shielding layer.

[0010] The beneficial effects of the utility model are:

[0011] (1) The utility model is an intelligent tensile-resistant medium-voltage power cable used in rivers and lakes. By providing an inner monitoring shielding layer and an outer monitoring shielding layer that are staggered and wound at the connection position between the central core wire group and the external protective component, the tensile and compressive resistance of the entire power cable can be greatly improved;

[0012] (2) By setting a non-metallic internal isolation layer between the inner monitoring shielding layer and the outer monitoring shielding layer, it can not only ensure the internal isolation under normal conditions and reduce the possibility of false alarms, but also guide the flow after water intrusion and improve the internal thermal conductivity to a certain extent;

[0013] (3) By adopting a spiral structure design, the self-rebound performance of the cable can be improved, thereby improving the safety and stability of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a cross-sectional view of the present utility model.

[0016] Figure 2 It is a partial structural schematic diagram of the assembly end of the non-metallic internal isolation layer and the outer monitoring shielding layer in the utility model.

[0017] Figure 3 It is a partial schematic diagram of the inner side of the internal isolation layer of non-metallic material in the utility model. DETAILED DESCRIPTION

[0018] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Figure 1 , Figure 2 and Figure 3 An intelligent tensile-resistant medium-voltage power cable for use in rivers, lakes and reservoirs is shown, comprising a central core wire group and an external protective component, the central core wire group consisting of three power core wires 1 located in the center, a core wire shielding layer 2 located on the periphery of the power core wire 1, an XLPE insulation layer 3 located on the periphery of the core wire shielding layer 2, an insulation shielding layer 4 located on the periphery of the XLPE insulation layer 3, a metal shielding layer 44 located on the periphery of the insulation shielding layer 4 and an inner monitoring shielding layer 5 of a spiral structure, an inner lining layer 45 for preventing electrical corrosion is arranged between the central core wire group and the external protective component, and the external protective component consists of a non-metallic internal isolation layer 6 wrapped around the periphery of the inner monitoring shielding layer 5, an outer monitoring shielding layer 7 wrapped around the non-metallic internal isolation layer 6, a waterproof inner sheath layer 8 wrapped around the periphery of the outer monitoring shielding layer 7 from the inside to the outside, an isolation water-blocking layer 9, a waterproof isolation layer 10, a buffer water-blocking layer 11, a radial water-blocking layer 12, an anti-corrosion inner lining layer 13 and a corrosion-resistant outer sheath layer 14.

[0021] In order to improve internal stability and protection, a water-blocking filling layer 15 is filled inside the inner lining layer 45 and outside the power core wire 1 .

[0022] In order to increase the coverage area, a gap is wrapped between the inner monitoring shielding layer 5 and the outer monitoring shielding layer 7 .

[0023] In order to cooperate with the central diversion, the non-metallic internal isolation layer 6 is provided with internal diversion holes 16 .

[0024] By setting the internal isolation layer 6 of non-metallic material, it can be ensured that the inner monitoring shielding layer 5 and the outer monitoring shielding layer 7 will not contact each other under normal circumstances. However, when water invades the inside of the cable, the invading water will pass through the internal guide hole 16, connecting the inner monitoring shielding layer 5 and the outer monitoring shielding layer 7 in series, and an internal series circuit will be formed. The current is received by the monitoring mechanism connected to the cable connection end, and the current reception speed is used to determine the leakage position. The daily monitoring method is to use the monitoring power supply method, and only power will be transmitted to the inner monitoring shielding layer 5 alone in a single time. Once a series connection occurs, the current will be received at the connection end of the outer monitoring shielding layer 7.

[0025] In order to ensure that the monitoring range is fully covered, the width of the inner monitoring shielding layer 5 and the outer monitoring shielding layer 7 is greater than the winding gap between the inner side surface of the inner monitoring shielding layer 5 and the outer monitoring shielding layer 7 .

[0026] Because its width is greater than the winding gap, the extrusion can ensure that water flows from the outer monitoring shielding layer 7 to the internal guide hole 16 and then flows through the inner monitoring shielding layer 5 from the internal guide hole 16 regardless of the location of water intrusion.

[0027] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An intelligent tensile-resistant medium-voltage power cable for use in rivers and lakes, comprising a central core wire group and an external protection component, characterized in that: The central core wire group is composed of three power core wires (1) located in the center, a core wire shielding layer (2) located on the periphery of the power core wire (1), an XLPE insulation layer (3) located on the periphery of the core wire shielding layer (2), an insulation shielding layer (4) located on the periphery of the XLPE insulation layer (3), a metal shielding layer (44) located on the periphery of the insulation shielding layer (4), and an inner monitoring shielding layer (5) of a spiral structure. An inner lining layer (45) for preventing electrical corrosion is provided between the central core wire group and the external protection component. The external protection component is composed of a non-metallic internal isolation layer (6) wrapped around the periphery of the inner monitoring shielding layer (5), an outer monitoring shielding layer (7) wound around the outside of the non-metallic internal isolation layer (6), a waterproof inner sheath layer (8) wrapped around the periphery of the outer monitoring shielding layer (7) in sequence from the inside to the outside, an isolation water blocking layer (9), a waterproof isolation layer (10), a buffer water blocking layer (11), a radial water blocking layer (12), an anti-corrosion inner lining layer (13), and a corrosion-resistant outer sheath layer (14).

2. According to claim 1, the intelligent tensile medium voltage power cable for use in rivers, lakes and reservoirs is characterized by: The inner lining layer (45) is filled with a water-blocking filling layer (15) located outside the power core wire (1).

3. According to claim 1, the intelligent tensile medium voltage power cable for use in rivers, lakes and reservoirs is characterized by: The inner monitoring shielding layer (5) and the outer monitoring shielding layer (7) are wrapped in a gap.

4. The intelligent tensile medium voltage power cable for use in rivers, lakes and reservoirs according to claim 1 is characterized by: The non-metallic internal isolation layer (6) is provided with internal flow guide holes (16).

5. The intelligent tensile medium voltage power cable for use in rivers, lakes and reservoirs according to claim 1 is characterized by: The widths of the inner monitoring shielding layer (5) and the outer monitoring shielding layer (7) are greater than the winding gap between the inner side surface of the inner monitoring shielding layer (5) and the outer monitoring shielding layer (7).

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