Low-energy-consumption medium-voltage cable
By longitudinally wrapping the conductor sub-outer layer of the medium-voltage cable with non-woven fabric to form a tape covering layer, the problems of low production efficiency and dented inner screen in the existing technology are solved, and energy consumption is reduced and the conductor shielding effect is improved.
Patent Information
- Application Number
- CN202421147325.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-24
AI Technical Summary
The existing production method of medium-voltage cable wraps the semiconductor tapes on the outer layer of the conductor seriously reduces the production efficiency of the stranded wire process and increases production costs. At the same time, the anti-depressed inner screen material is not ideal, resulting in the inner screen still being concave. into the conductor gap.
A low-energy consumption medium-voltage cable design is adopted. By longitudinally wrapping non-woven fabric on the conductor's sub-outer layer to form a tape layer, it expands the conductor surface area, reduces AC resistance, and forms a barrier on the sub-outer layer to prevent the inner screen from extrusion pressure. Get inside the conductor.
It reduces energy consumption, improves the smoothness of the interface between conductor shielding and insulation, avoids dents in the inner screen, improves production efficiency and reduces costs.
Smart Images
Figure CN222380322U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medium-voltage cables, in particular to a low-energy-consumption medium-voltage cable. Background Art
[0002] The conductor of AC medium voltage cable is a twisted conductor, which has good flexibility and bendability and can meet the needs of different specifications. For large-sized medium voltage cables, the conductor needs to be twisted through multiple layers of round copper wires. The connection between the conductor layers is not tight enough, and the gap between the single wires becomes larger in the outermost layer of the conductor.
[0003] In the prior art, the twisted conductor enters the cross-linking process. During the three-layer co-extrusion, due to the extrusion pressure of the extrusion, the inner screen will be embedded in the gaps between the outer monofilaments of the conductor, and may even be embedded in the conductor of the second outer layer, causing the inner screen to sag. The product quality does not meet customer requirements. The current method wraps a semi-conductive tape around the outer layer of the conductor to form a barrier between the conductor and the inner screen. In this way, the inner screen is not easily squeezed into the conductor. However, the semi-conductive tape is produced by wrapping, which seriously reduces the production efficiency of the twisting process. The use of the semi-conductive tape also increases the production cost. At the same time, attempts are made to use anti-sag inner screen materials. However, in actual use, the effect of the anti-sag inner screen materials is not ideal, and the inner screen will also sag into the gaps between the conductors. Utility Model Content
[0004] The purpose of the utility model is to solve the problem that the outer layer of the conductor is wrapped with a semi-conductive tape in the prior art to form a barrier between the conductor and the inner screen, so that the inner screen is not easily squeezed into the conductor, but the semi-conductive tape is produced by a wrapping method, which seriously reduces the production efficiency of the twisting process. The use of the semi-conductive tape also increases the production cost. At the same time, attempts are made to use anti-depression inner screen materials. In actual use, the effect of the anti-depression inner screen materials is not ideal, and the inner screen will also be depressed into the conductor gap. A low-energy medium-voltage cable is proposed.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a low-energy medium-voltage cable, comprising a conductor, the sub-outer layer of the conductor is longitudinally wrapped with a tape layer, the outer layer of the conductor is provided with a conductor shielding layer, the outer surface of the conductor shielding layer is provided with a cross-linked polyethylene insulation layer, the outer surface of the cross-linked polyethylene insulation layer is covered with an insulating shielding layer, the outer surface of the insulating shielding layer is covered with a soft copper tape, the outer surface of the soft copper tape is covered with a reinforcement layer, and the outer surface of the reinforcement layer is covered with a cable sheath.
[0006] Preferably, the reinforcement layer is composed of wound non-woven fabric.
[0007] Preferably, the wrapping layer is formed by longitudinally wrapping a non-woven fabric.
[0008] Preferably, an external groove is provided on the outer surface of the cable sheath.
[0009] Preferably, a metal ring is provided inside the peripheral groove.
[0010] Preferably, one end of the metal ring is fixedly connected with a sleeve ring.
[0011] Preferably, a connecting plate is provided on the outer surface of the metal ring.
[0012] Preferably, a connecting strip is fixedly connected between the connecting plate and the metal ring.
[0013] Preferably, a protective plate is fixedly connected between two adjacent connecting plates.
[0014] Preferably, the inner wall of the protective plate fits with the outer surface of the cable sheath.
[0015] Compared with the prior art, the advantages and positive effects of the utility model are:
[0016] 1. In the utility model, by setting the wrapping layer, during the conductor twisting process of the medium voltage cable, the non-woven fabric is longitudinally wrapped on the sub-outer layer of the conductor to form a wrapping layer, and the outer conductor and the sub-outer conductor are isolated by the non-woven fabric, thereby expanding the surface area of the conductor, reducing the skin effect when the alternating current flows, reducing the alternating current resistance, and thus reducing energy consumption. At the same time, after the sub-outer layer is longitudinally wrapped with the non-woven fabric, a barrier is formed on the sub-outer layer. During the co-extrusion of the three layers, the inner screen will not enter the conductor due to the extrusion pressure, causing the inner screen to sag, thereby improving the smoothness of the conductor shielding and insulation interface.
[0017] 2. In the utility model, by cooperating with the metal ring and the protective plate, in the subsequent excavation process, when the burial depth is about to be reached, the surface of the cable sheath can be protected by the protective plate and the metal ring to prevent the cable sheath from being damaged and ensure its integrity. At the same time, by setting the external groove, a staged layout is formed on the surface of the cable sheath, and after the soil is laid, the cable sheath is not easy to move. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A cross-sectional view of a low energy consumption medium voltage cable is proposed for the utility model;
[0019] Figure 2 A schematic diagram of the connection state between a cable sheath and a metal ring in a low-energy medium-voltage cable is provided for the utility model;
[0020] Figure 3 The utility model provides a three-dimensional structural schematic diagram of a metal ring in a low-energy medium-voltage cable.
[0021] Legend: 1. Cable sheath; 2. Reinforcement layer; 3. Soft copper tape; 4. Insulation shielding layer; 5. Cross-linked polyethylene insulation layer; 6. Conductor; 7. Tape layer; 8. Conductor shielding layer; 9. Connecting strip; 10. External slot; 11. Metal ring; 12. Connecting plate; 13. Protective plate; 14. Ring. DETAILED DESCRIPTION
[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.
[0024] Embodiment 1
[0025] like Figure 1 - Figure 3 As shown, the utility model provides a low-energy medium-voltage cable, including a conductor 6, the sub-outer layer of the conductor 6 is longitudinally wrapped with a tape layer 7, the outer layer of the conductor 6 is provided with a conductor shielding layer 8, the outer surface of the conductor shielding layer 8 is provided with a cross-linked polyethylene insulation layer 5, the outer surface of the cross-linked polyethylene insulation layer 5 is covered with an insulation shielding layer 4, the outer surface of the insulation shielding layer 4 is covered with a soft copper tape 3, the outer surface of the soft copper tape 3 is covered with a reinforcement layer 2, the outer surface of the reinforcement layer 2 is covered with a cable sheath 1, the reinforcement layer 2 is composed of a non-woven fabric winding, and the tape layer 7 is composed of a non-woven fabric longitudinally wrapped. In the production process of the medium-voltage conductor strand, the non-woven fabric is longitudinally wrapped on the sub-outer conductor, and the speed of the longitudinal wrapping changes with the speed of the stranding, which does not affect the production efficiency of the stranding. At the same time, after the sub-outer layer is longitudinally wrapped with the non-woven fabric, a barrier is formed on the sub-outer layer. When the three layers are co-extruded, the inner screen will not enter the conductor due to the extrusion pressure, causing the inner screen to sag, thereby improving the smoothness of the conductor shielding and insulation interface.
[0026] The specific settings and functions of this embodiment are described in detail below. Through the setting of the wrapping layer 7, during the twisting process of the conductor 6 of the medium voltage cable, the sub-outer layer of the conductor 6 is longitudinally wrapped with non-woven fabric to form the wrapping layer 7. The outer conductor and the sub-outer conductor are isolated by the non-woven fabric, thereby expanding the surface area of the conductor, reducing the skin effect when alternating current flows, reducing the AC resistance, and thus reducing energy consumption. At the same time, after the sub-outer layer is longitudinally wrapped with the non-woven fabric, a barrier is formed in the sub-outer layer. When the three layers are co-extruded, the inner screen will not enter the conductor due to the extrusion pressure, causing the inner screen to sag, thereby improving the smoothness of the conductor shielding and insulation interface.
[0027] Embodiment 2
[0028] like Figure 1 - Figure 3 As shown, an external groove 10 is provided on the outer surface of the cable sheath 1, a metal ring 11 is provided inside the external groove 10, one end of the metal ring 11 is fixedly connected with a sleeve ring 14, a connecting plate 12 is provided on the outer surface of the metal ring 11, a connecting strip 9 is fixedly connected between the connecting plate 12 and the metal ring 11, a protective plate 13 is fixedly connected between two adjacent connecting plates 12, and the inner wall of the protective plate 13 is in contact with the outer surface of the cable sheath 1.
[0029] The effect achieved by the entire embodiment is that, through the coordinated arrangement of the metal ring 11 and the protective plate 13, in the subsequent excavation process, when the burial depth is about to be reached, the surface of the cable sheath 1 can be protected by the protective plate 13 and the metal ring 11 to prevent the cable sheath 1 from being damaged and ensure its integrity. At the same time, through the arrangement of the external groove 10, a staged layout is formed on the surface of the cable sheath 1, and after the soil is laid, the cable sheath 1 can be prevented from moving easily.
[0030] The usage and working principle of the device: During the production process of medium-voltage conductor strands, non-woven fabric is longitudinally wrapped on the secondary outer conductor, and the speed of longitudinal wrapping changes with the speed of stranding. The non-woven fabric after longitudinal wrapping forms a wrapping layer 7. After the production is completed, when it needs to be laid for use, a metal ring 11 needs to be installed in the external groove 10, and one end of the metal ring 11 is passed through the ring 14, and then the end of the metal ring 11 is bent and hooked with the ring 14 to form a limit. After installation, the connecting plate 12 needs to be located at the top, and then the protective plate 13 is welded between the two adjacent connecting plates 12. Through the overhead 19, heat is not easily transferred to the cable sheath 1 to prevent damage to the cable sheath 1, and there is no need for too many welding points, it is only necessary to ensure that the protective plate 13 is not easy to fall off. When the cable sheath 1 needs to be bent during laying, the bent protective plate 13 can be selected for installation.
[0031] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. A low energy consumption medium voltage cable, characterized in that: The invention comprises a conductor (6), the secondary outer layer of the conductor (6) being longitudinally wrapped with a tape layer (7), the outer layer of the conductor (6) being provided with a conductor shielding layer (8), the outer surface of the conductor shielding layer (8) being provided with a cross-linked polyethylene insulation layer (5), the outer surface of the cross-linked polyethylene insulation layer (5) being covered with an insulation shielding layer (4), the outer surface of the insulation shielding layer (4) being covered with a soft copper tape (3), the outer surface of the soft copper tape (3) being covered with a reinforcement layer (2), and the outer surface of the reinforcement layer (2) being covered with a cable sheath (1).
2. A low energy consumption medium voltage cable according to claim 1, characterized in that: The reinforcement layer (2) is composed of a wound non-woven fabric.
3. A low energy consumption medium voltage cable according to claim 1, characterized in that: The wrapping layer (7) is made of non-woven fabric wrapped longitudinally.
4. A low energy consumption medium voltage cable according to claim 1, characterized in that: The outer surface of the cable sheath (1) is provided with an external groove (10).
5. A low energy consumption medium voltage cable according to claim 4, characterized in that: A metal ring (11) is arranged inside the external groove (10).
6. A low energy consumption medium voltage cable according to claim 5, characterized in that: One end of the metal ring (11) is fixedly connected to a sleeve ring (14).
7. A low energy consumption medium voltage cable according to claim 5, characterized in that: The outer surface of the metal ring (11) is provided with a connecting plate (12).
8. A low energy consumption medium voltage cable according to claim 7, characterized in that: A connecting strip (9) is fixedly connected between the connecting plate (12) and the metal ring (11).
9. A low energy consumption medium voltage cable according to claim 7, characterized in that: A protective plate (13) is fixedly connected between two adjacent connecting plates (12).
10. A low energy consumption medium voltage cable according to claim 9, characterized in that: The inner wall of the protective plate (13) is in contact with the outer surface of the cable sheath (1).