Novel composite stranded conductor for cable
By using a composite stranded conductor structure with multiple reinforcing layers around the outer periphery of the cable conductor, the problems of conductor deformation and insulation damage under high temperature conditions are solved, improving the bending performance and service life of the cable and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU CABLE FACTORY CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-04-28
AI Technical Summary
Existing cable conductor structures suffer from problems such as high cost, poor bending performance, single-wire buckling, and short cable life. In particular, under high temperature conditions, conductor deformation and insulation layer damage are prone to occur, affecting long-term performance and safety.
The composite stranded conductor structure consists of a conductor body and multiple reinforcing layers covering its outer perimeter. Each reinforcing layer is composed of reinforcing units and connecting units. The cooperation between the reinforcing units and connecting units disperses thermal stress, prevents conductor deformation, enhances radial support, and extends service life.
It effectively disperses thermal stress in the conductor, avoids high-temperature deformation, reduces the risk of insulation damage, improves the long-term performance and safety of the conductor, reduces resistance increase, extends service life, and reduces production costs.
Smart Images
Figure CN224177129U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of new cable manufacturing technology, specifically relating to a new type of composite stranded conductor for cables. Background Technology
[0002] Firstly, the compressed circular conductor, formed by cold drawing of single stranded round wires, is prone to defects such as burrs and sharp edges during the cold drawing process. This can lead to point discharge during energization, accelerating insulation aging and failure, and reducing cable lifespan. Furthermore, dislocations also occur in the material's crystal structure during cold drawing, resulting in a decrease in electrical performance. To meet relevant regulations regarding conductor resistance, it is necessary to increase the amount of material used to compensate for this performance degradation, increasing material costs and weakening market competitiveness.
[0003] Secondly, there are shaped wire conductors, which are made by stranding shaped single wires. There is no pulling during the stranding process of shaped wire conductors. Compared with compacted round conductors, less material is used for the same electrical performance. The smooth conductor surface solves the problem of tip discharge. However, shaped wire conductors have many disadvantages:
[0004] First, it has poor bending performance. Due to the high fill factor of about 99%, the conductor is like a solid steel rod. There is almost no misalignment space between individual wires during the bending process, resulting in poor overall performance and making it unfriendly to construction and installation.
[0005] Secondly, there is the issue of single-wire overturning. During the single-wire stranding process, side overturning is prone to occur, which can lead to substandard conductor insulation layer thickness and insufficient extrusion gaps.
[0006] Composite stranded conductor structures play a crucial role in the field of medium-voltage fire-resistant cables, improving their mechanical and electrical properties and ensuring stable operation in complex environments. However, current composite stranded conductor structures on the market have some shortcomings in terms of fire resistance.
[0007] Therefore, improvements are urgently needed to comprehensively address issues such as cost, bending performance, and cable lifespan. Utility Model Content
[0008] This application aims to address the problems of high cost, poor bending performance, single-wire twisting, and short service life of traditional cable conductor structures in the prior art. When the conductor operates for a long time, the conductor temperature increases significantly, and problems such as conductor deformation and insulation damage are prone to occur under high-temperature operating conditions, affecting the long-term performance and safety of the conductor and cable. Furthermore, during the conductor stranding process, the conductor is compressed and hardened, resulting in increased conductor resistance and a short conductor service life. Therefore, this application proposes a new type of composite stranded conductor for cables.
[0009] This application adopts the following scheme: a novel composite stranded conductor for cables, which is formed by stranding a conductor body and one or more reinforcing layers covering the outer periphery of the conductor body. Each reinforcing layer includes a plurality of reinforcing units spaced around the axis of the conductor body on the outer periphery of the conductor body, and a connecting unit disposed between two adjacent reinforcing units. The number of reinforcing layers is defined as N, and N satisfies the following relationship: 1≤N<5.
[0010] In some feasible embodiments, the conductor body is formed by twisting together multiple conductor filaments, and the number of conductor filaments is defined as M, wherein M satisfies the following relationship: 3 < M < 25.
[0011] In some feasible embodiments, the reinforcing unit is made of the same material as the conductor filament.
[0012] In some feasible embodiments, the conductor monofilament is made of any one of T1 copper, T2 copper, 1050 aluminum, 1060 aluminum, tin-plated copper, or nickel-plated copper.
[0013] In some feasible embodiments, the twisting direction of the multiple conductor filaments is defined as A, and the twisting direction of the conductor body and one or more reinforcing layers is defined as B, wherein A and B are the same.
[0014] In some feasible embodiments, the pitch ratio of the multiple conductor filaments during the stranding process is selected to be 15-20;
[0015] The pitch ratio of the conductor body and one or more reinforcing layers during the stranding process is selected to be 12-18.
[0016] In some feasible embodiments, the connecting unit includes connecting grooves that are staggered on both sides of the reinforcing unit, and connecting protrusions that are staggered on both sides of the reinforcing unit. The connecting protrusions between two adjacent reinforcing units can be matched and extended into the connecting grooves so that the two reinforcing units can be connected.
[0017] In some feasible embodiments, the cross-sectional shape of the connecting groove is semi-circular, and the shape of the connecting flange matches the shape of the connecting groove.
[0018] In some feasible embodiments, a plurality of the reinforcing units are arranged in a spiral pattern around the axis of the conductor body and on the outer periphery of the conductor body.
[0019] Compared with the prior art, this application has the following beneficial effects:
[0020] This application provides a novel composite stranded conductor for cables, comprising a conductor body and one or more reinforcing layers covering the outer periphery of the conductor body. Each reinforcing layer consists of multiple reinforcing units spaced apart around the axis of the conductor body, and connecting units disposed between adjacent reinforcing units. The number of reinforcing layers N satisfies 1 ≤ N < 5. By setting multiple reinforcing layers around the outer periphery of the conductor body and through the cooperation of the reinforcing units and connecting units, the thermal stress generated in the conductor during operation is effectively dispersed, preventing the conductor from deforming due to high temperature, significantly reducing the risk of insulation layer damage due to thermal expansion, thereby improving the long-term performance and safety of the conductor. In addition, the multi-layer structure of the reinforcing layers enhances the radial support force of the conductor during stranding, reducing the problem of increased resistance caused by conductor hardening under pressure, and extending the service life of the conductor. It has the advantages of simple structure, reasonable design, simple manufacturing process, no need for additional complex equipment, and easy promotion and implementation. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of a novel composite stranded conductor for cables according to this application;
[0022] Figure 2 This application Figure 1 A magnified view of a section at point A in the middle;
[0023] Figure 3 This is a structural schematic diagram of the strengthening unit of this application. Detailed Implementation
[0024] Combination Figure 1-3 The content shown further illustrates the technical solution provided in this application: a novel composite stranded conductor for cables, which is formed by stranding a conductor body A1 and one or more reinforcing layers A2 covering the outer periphery of the conductor body A1. Each reinforcing layer A2 includes a plurality of reinforcing units A3 spaced around the axis of the conductor body A1 on the outer periphery of the conductor body A1, and a connecting unit A4 disposed between two adjacent reinforcing units A3. The number of reinforcing layers A2 is defined as N, and N satisfies the following relationship: 1≤N<5.
[0025] In actual implementation, N=3.
[0026] This application provides a novel composite stranded conductor for cables, comprising a conductor body and one or more reinforcing layers covering the outer periphery of the conductor body. Each reinforcing layer consists of multiple reinforcing units spaced apart around the axis of the conductor body, and connecting units disposed between adjacent reinforcing units. The number of reinforcing layers N satisfies 1 ≤ N < 5. By setting multiple reinforcing layers around the outer periphery of the conductor body and through the cooperation of the reinforcing units and connecting units, the thermal stress generated in the conductor during operation is effectively dispersed, preventing the conductor from deforming due to high temperature, significantly reducing the risk of insulation layer damage due to thermal expansion, thereby improving the long-term performance and safety of the conductor. In addition, the multi-layer structure of the reinforcing layers enhances the radial support force of the conductor during stranding, reducing the problem of increased resistance caused by conductor hardening under pressure, and extending the service life of the conductor. It has the advantages of simple structure, reasonable design, simple manufacturing process, no need for additional complex equipment, and easy promotion and implementation.
[0027] In this embodiment, the conductor body A1 is formed by twisting together multiple conductor single wires A10. The number of conductor single wires A10 is defined as M, and M satisfies the following relationship: 3 < M < 25.
[0028] In actual implementation, M=19.
[0029] In this embodiment, the reinforcing unit A3 is made of the same material as the conductor monofilament A10.
[0030] In this embodiment, the conductor monofilament A10 is made of any one of the following materials: T1 copper, T2 copper, 1050 aluminum, 1060 aluminum, tin-plated copper, or nickel-plated copper.
[0031] In actual implementation, the conductor single wire A10 is made of T1 copper.
[0032] In actual implementation, using T1 copper as the conductor monofilament material can significantly improve the conductor's conductivity, mechanical strength, and durability, while reducing production costs and maintenance difficulty, demonstrating significant technical advantages and practical application value.
[0033] In actual implementation, the reinforcing unit A3 is made of the same material as the conductor monofilament A10. This can effectively improve the conductivity of the conductor structure and prevent electrochemical reactions between the reinforcing layer and the conductor body.
[0034] In this embodiment, the twisting direction of the multiple conductor filaments A10 is defined as A, and the twisting direction of the conductor body A1 and one or more reinforcing layers A2 is defined as B, where A and B are the same.
[0035] In this embodiment, the pitch ratio of the multiple conductor wires A10 during the stranding process is selected as 15-20;
[0036] The pitch ratio of the conductor body A1 and one or more reinforcing layers A2 during the stranding process is selected to be 12-18.
[0037] In actual implementation, the pitch ratio of the multiple conductor wires A10 during the stranding process is selected as 18.
[0038] In actual implementation, the pitch ratio of the conductor body A1 and one or more reinforcing layers A2 during the stranding process is selected as 16.
[0039] In this embodiment, the connecting unit A4 includes connecting grooves A40 that are staggered on both sides of the reinforcing unit A3, and connecting protrusions A41 that are staggered on both sides of the reinforcing unit A3. The connecting protrusions A41 between two adjacent reinforcing units A3 can be matched and extended into the connecting grooves A40 so that the two reinforcing units A3 can be connected.
[0040] In this embodiment, the cross-sectional shape of the connecting groove A40 is semi-circular, and the shape of the connecting protrusion A41 matches the shape of the connecting groove A40.
[0041] In this embodiment, multiple reinforcing units A3 are arranged in a spiral pattern around the axis of the conductor body A1 and on the outer periphery of the conductor body A1.
[0042] In actual implementation, one or more interlocking reinforcing layers are set around the conductor body, which can effectively improve the structural stability of the conductor body and solve the overturning problem inherent in conventional conductor structures.
[0043] Furthermore, by setting one or more interlocking reinforcing layers around the conductor body, the conductor structure provided in this application does not involve any type of compression during stranding, thus preventing conductor hardening and increased conductor resistance, resulting in superior conductivity under the same cross-sectional conditions. The conductor structure has a smooth surface, eliminating conductor tip discharge and effectively improving cable lifespan.
[0044] In practical application, the novel composite stranded conductor for cables provided in this application can be used to prepare flame-retardant cables.
[0045] This application provides a novel composite stranded conductor for cables, comprising a conductor body and one or more reinforcing layers covering the outer periphery of the conductor body. Each reinforcing layer consists of multiple reinforcing units spaced apart around the axis of the conductor body, and connecting units disposed between adjacent reinforcing units. The number of reinforcing layers N satisfies 1 ≤ N < 5. By setting multiple reinforcing layers around the outer periphery of the conductor body and through the cooperation of the reinforcing units and connecting units, the thermal stress generated in the conductor during operation is effectively dispersed, preventing the conductor from deforming due to high temperature, significantly reducing the risk of insulation layer damage due to thermal expansion, thereby improving the long-term performance and safety of the conductor. In addition, the multi-layer structure of the reinforcing layers enhances the radial support force of the conductor during stranding, reducing the problem of increased resistance caused by conductor hardening under pressure, and extending the service life of the conductor. It has the advantages of simple structure, reasonable design, simple manufacturing process, no need for additional complex equipment, and easy promotion and implementation.
[0046] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A novel composite stranded conductor for cables, characterized in that, It is composed of a conductor body (A1) and one or more reinforcing layers (A2) wrapped around the outer periphery of the conductor body (A1). Each reinforcing layer (A2) includes a plurality of reinforcing units (A3) spaced around the axis of the conductor body (A1) on the outer periphery of the conductor body (A1) and a connecting unit (A4) between two adjacent reinforcing units (A3). The number of reinforcing layers (A2) is defined as N, and N satisfies the following relationship: 1≤N<5.
2. The novel composite stranded conductor for cables according to claim 1, characterized in that, The conductor body (A1) is formed by twisting together multiple conductor filaments (A10). The number of conductor filaments (A10) is defined as M, and M satisfies the following relationship: 3 < M < 25.
3. A novel composite stranded conductor for cables according to claim 2, characterized in that, The reinforcing unit (A3) is made of the same material as the conductor monofilament (A10).
4. A novel composite stranded conductor for cables according to claim 2, characterized in that, The conductor monofilament (A10) is made of any one of the following materials: T1 copper, T2 copper, 1050 aluminum, 1060 aluminum, tin-plated copper, or nickel-plated copper.
5. A novel composite stranded conductor for cables according to claim 2, characterized in that, The twisting direction of the multiple conductor filaments (A10) is defined as A, and the twisting direction of the conductor body (A1) and one or more reinforcing layers (A2) is defined as B, where A and B are the same.
6. A novel composite stranded conductor for cables according to claim 2, characterized in that, The pitch ratio of the multiple conductor monofilaments (A10) during the stranding process is selected to be 15-20; The pitch ratio of the conductor body (A1) and one or more reinforcing layers (A2) during the stranding process is selected to be 12-18.
7. A novel composite stranded conductor for cables according to claim 1, characterized in that, The connecting unit (A4) includes connecting grooves (A40) staggered on both sides of the reinforcing unit (A3) and connecting protrusions (A41) staggered on both sides of the reinforcing unit (A3). The connecting protrusions (A41) between two adjacent reinforcing units (A3) can be matched and extended into the connecting grooves (A40) so that the two reinforcing units (A3) can be connected.
8. A novel composite stranded conductor for cables according to claim 7, characterized in that, The cross-sectional shape of the connecting groove (A40) is semi-circular, and the shape of the connecting protrusion (A41) matches the shape of the connecting groove (A40).
9. A novel composite stranded conductor for cables according to claim 7, characterized in that, The plurality of the reinforcing units (A3) are arranged in a spiral pattern around the axis of the conductor body (A1) and on the outer periphery of the conductor body (A1).