Copper / aluminum alloy common conductor economical low-voltage multi-core cable

Abstract

A copper / aluminum alloy common conductor economical low-voltage multi-core cable relates to the technical field of multi-core cables and comprises phase wire cores and neutral wire cores. Each phase wire core comprises a phase wire conductor which is made of a pure copper material; the neutral wire core comprises a neutral wire conductor which is made of an aluminum alloy material. The phase wire core is used as a core part for transmitting electric energy, is made of copper with more excellent conductivity, safety and reliability, and can stably operate in a complex power transmission environment. And the neutral wire core playing an auxiliary role is replaced by aluminum alloy, so that the cost is effectively reduced, and the weight of the cable is greatly reduced. According to the multi-core cable, the characteristics of different conductor materials are fully considered, the optimal balance between performance and cost is achieved, and the multi-core cable has good application value.

Description

Technical Field

[0001] This utility model relates to the field of multi-core cable technology, and more specifically, to an economical low-voltage multi-core cable with a copper / aluminum alloy common conductor. Background Technology

[0002] In current cable applications, copper and aluminum are the primary metals used as core conductors. Copper, however, offers superior conductivity; its resistivity is significantly lower than aluminum. For the same cross-sectional area, copper core cables exhibit higher current transmission efficiency and lower energy loss. Furthermore, copper possesses excellent corrosion resistance and mechanical strength, leading to its widespread application. While aluminum alloys, as core conductors, have higher volume resistivity and relatively poor conductivity, their mass resistivity (resistivity per unit mass of metal) is superior to copper conductors. This results in significant advantages in cost and portability, as well as better mechanical strength and resistance to compressive creep. The challenge has been combining the advantages of both – the conductivity and reliability of copper with the low cost and lightweight of aluminum alloys. Partial replacement of copper cores is one approach, currently achieved using copper-clad aluminum. However, this significantly increases process complexity, and electrochemical corrosion at the copper-aluminum interface remains a major challenge. Utility Model Content

[0003] The purpose of this utility model is to provide an economical low-voltage multi-core cable with a copper / aluminum alloy common conductor. It has a novel structure, which not only has the conductivity of copper core cables, but also effectively reduces costs.

[0004] The embodiments of this utility model are implemented as follows:

[0005] An economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor includes a phase conductor and a neutral conductor; the phase conductor includes a phase conductor and a first insulation layer covering the phase conductor, and the phase conductor is made of pure copper; the neutral conductor includes a neutral conductor and a second insulation layer covering the conductor, and the neutral conductor is made of aluminum alloy.

[0006] Furthermore, in other preferred embodiments of this utility model, the insulating layer is an insulating layer with excellent properties such as cross-linked polyethylene or polypropylene.

[0007] Furthermore, in other preferred embodiments of this utility model, the thickness of the insulation layer of different specifications is 0.8~3.0mm.

[0008] Furthermore, in other preferred embodiments of this invention, the cross-sectional area of ​​both the phase conductor and the neutral conductor is 16~300 mm². 2 .

[0009] Furthermore, in other preferred embodiments of this utility model, the phase conductor is made of single wires with a diameter of 1.33~3.75mm twisted together, with a twisting pitch ratio of 16~30D; the neutral conductor is made of single wires with a diameter of 1.68~3.75mm twisted together, with a twisting pitch ratio of 12~30D.

[0010] Furthermore, in other preferred embodiments of this utility model, an inner lining layer, an armor layer, and an outer sheath layer are sequentially provided outside the phase conductor and the neutral conductor, and filler is filled between the inner lining layer and the phase conductor and the neutral conductor.

[0011] Furthermore, in other preferred embodiments of this utility model, the copper / aluminum alloy shared conductor economical low-voltage multi-core cable also includes a grounding core, which includes a grounding conductor and an insulation layer covering the grounding conductor. The grounding conductor is made of aluminum alloy.

[0012] Furthermore, in other preferred embodiments of this invention, the cross-sectional areas of the grounding core and the neutral core are equivalent.

[0013] The beneficial effects of this utility model embodiment are:

[0014] This utility model provides an economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor, comprising phase cores and a neutral core. The phase core includes a phase conductor made of pure copper; the neutral core includes a neutral conductor made of aluminum alloy. The phase core, as the core component for transmitting electrical energy, uses copper, which offers superior conductivity and reliability, enabling stable operation in complex power transmission environments. The neutral core, which plays an auxiliary role, is replaced with aluminum alloy, effectively reducing costs and significantly lightening the cable's weight. This multi-core cable fully considers the characteristics of different conductor materials, aiming to achieve the best balance between performance and cost, and possesses excellent application value. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A cross-sectional view of one arrangement of a multi-core cable provided in an embodiment of this utility model;

[0017] Figure 2 This is a cross-sectional view of another arrangement of a multi-core cable provided in an embodiment of the present invention.

[0018] Icons: 100 - Multi-core cable; 110 - Phase conductor; 111 - Phase conductor; 112 - First insulation layer; 120 - Neutral conductor; 121 - Neutral conductor; 122 - First elastic buffer layer; 123 - Second insulation layer; 130 - Inner lining layer; 140 - Armor layer; 150 - Outer sheath layer; 160 - Filler; 170 - Grounding conductor; 171 - Grounding conductor; 172 - Second elastic buffer layer; 173 - Third insulation layer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, 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 a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example

[0024] This embodiment provides an economical low-voltage multi-core cable 100 with a copper / aluminum alloy common conductor, referring to... Figure 1 As shown, it includes phase conductor 110 and neutral conductor 120.

[0025] Among them, such as Figure 1 As shown, the phase conductor 110 includes a phase conductor 111 and a first insulation layer 112 covering the phase conductor 111. The phase conductor 111 is made of pure copper. The neutral conductor 120 includes a neutral conductor 121 and a second insulation layer 123 covering the neutral conductor 121. The neutral conductor 121 is made of aluminum alloy. The phase conductor 110, as the core component for transmitting electrical energy, uses copper, which offers superior conductivity and reliability, enabling stable operation in complex power transmission environments. The auxiliary neutral conductor 120 is replaced with aluminum alloy, effectively reducing costs and significantly lightening the cable weight.

[0026] This structure can be used to replace traditional 3+1 core copper conductor cables or four-core copper conductor cables. It is more recommended for replacing four-core copper conductor cables. Because the conductivity of aluminum alloy is lower than that of copper, replacing copper with aluminum alloy at the same cross-sectional area will result in a decrease in current carrying capacity of approximately 30% to 40%. In existing technologies, when replacing copper cores with aluminum alloy cores, the cross-sectional area of ​​the aluminum alloy core is often increased to avoid a decrease in current carrying capacity. However, in this embodiment, since the aluminum alloy replaces the neutral core 120, which has essentially zero current, the issue of reduced current carrying capacity does not need to be considered in conventional applications. Compared to 3+1 core copper conductor cables of the same specifications, the neutral core 120 of the four-core copper conductor cable has a larger cross-sectional area, making it more suitable for this replacement solution.

[0027] Furthermore, according to the requirements of GB 50054-2011, when the phase conductor 111 is made of pure copper and its cross-sectional area is greater than 16mm², the cross-sectional area of ​​the neutral conductor 121 can be smaller than that of the phase conductor 111, but should not be less than half of the cross-sectional area of ​​the phase conductor 111. Taking a 3+1 core copper conductor cable with specification YJV-0.6 / 1 3×240+120 as an example, when the neutral conductor 121 is replaced with aluminum alloy, a four-core layout can be adopted, denoted as YJV-0.6 / 1 3×240+LH240. Calculations show that 120mm²... 2 The DC resistance of copper conductors is no greater than 0.153 ohms / km, while 240mm²... 2 The DC resistance of the aluminum alloy conductor is no greater than 0.125 ohms / km. The electrical performance of the YJV-0.6 / 1 3×240+LH240 with a four-core layout is even better than that of the 3+1 core copper conductor cable YJV-0.6 / 1 3×240+120. It can be used as a complete replacement for YJV-0.6 / 1 3×240+120.

[0028] Figure 1 Taking a replacement of a four-core copper conductor cable as an example, optionally, both the first insulation layer 112 and the second insulation layer 123 are cross-linked polyethylene insulation layers; a first elastic buffer layer 122, which is a EPDM rubber elastic layer, is also provided between the second insulation layer 123 and the neutral conductor 121. Cross-linked polyethylene is a conventional insulation material with good temperature resistance, mechanical strength, and anti-aging properties. In this embodiment, the elongation and tensile strength of the aluminum alloy core are lower than those of the copper core. To enhance the mechanical strength of the aluminum alloy core, an EPDM rubber elastic layer is added as a buffer within the traditional cross-linked polyethylene insulation layer. The EPDM rubber elastic layer absorbs stress through elastic deformation, thereby improving the tensile strength and bending performance of the aluminum alloy core.

[0029] Optionally, the cross-sectional areas of the phase conductor 111 and the neutral conductor 121 are equivalent, and the cross-sectional areas of the phase conductor 111 and the neutral conductor 121 are 16~300 mm². 2 It can accommodate various specifications of conventional cables (3×16+16, 3×25+25, 3×240+120, etc.). The thickness of the first insulation layer 112 is 1.4~3.0mm, the thickness of the second insulation layer 123 is 0.6~1.4mm, and the thickness of the first elastic buffer layer 122 is 0.8~1.6mm. Within the above parameter range, the overall strength of this multi-core cable 100 is better.

[0030] The phase conductor 111 is made of stranded single wires with a diameter of 1.33~3.75 mm and a stranding pitch ratio of 16~30D; the neutral conductor 121 is made of stranded single wires with a diameter of 1.68~31.75 mm and a stranding pitch ratio of 12~30D. The use of larger diameter single wires and a smaller stranding pitch ratio in the neutral conductor 121 can further compensate for the strength difference between copper and aluminum alloys.

[0031] In addition, such as Figure 1 As shown, an inner liner 130, an armor layer 140, and an outer sheath layer 150 are sequentially provided outside the phase conductor 110 and the neutral conductor 120. A filler 160 is used to fill the spaces between the inner liner 130 and the phase conductor 110 and the neutral conductor 120. The inner liner 130, armor layer 140, and outer sheath layer 150 can all be selected from conventional materials used in existing cables, and will not be described in detail here.

[0032] Furthermore, in other preferred embodiments, such as Figure 2 As shown, the multi-core cable 100 also includes a grounding core 170. With the addition of the grounding core 170, it can be used to replace traditional 3+2 core, 4+1 core and five-core copper conductor cables. Figure 2 Taking a five-core copper conductor cable as an example, the cross-sectional areas of the grounding core 170 and the neutral core 120 are equivalent. Since the current in the grounding core 170 is essentially zero under normal application scenarios, it is feasible to replace it with aluminum alloy. The grounding core 170 includes a grounding conductor 171 and a second elastic buffer layer 172 and a third insulation layer 173 covering the grounding conductor 171. The grounding conductor 171 is made of aluminum alloy. Because the grounding conductor 171 and the neutral conductor 121 use the same material, the material selection and arrangement of the second elastic buffer layer 172 and the third insulation layer 173 are no different from those of the first elastic buffer layer 122 and the second insulation layer 123.

[0033] In summary, this utility model embodiment provides an economical low-voltage multi-core cable 100 with a copper / aluminum alloy shared conductor, comprising a phase core 110 and a neutral core 120. The phase core 110 includes a phase conductor 111, which is made of pure copper. The neutral core 120 includes a neutral conductor 121, which is made of aluminum alloy. The phase core 110, as the core component for transmitting electrical energy, uses copper, which offers superior conductivity and reliability, enabling stable operation in complex power transmission environments. The neutral core 120, which plays an auxiliary role, is replaced by an aluminum alloy, effectively reducing costs and significantly lightening the cable's weight. This multi-core cable 100 fully considers the characteristics of different conductor materials, aiming to achieve the best balance between performance and cost, and possesses excellent application value.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor, characterized in that, It includes a phase conductor and a neutral conductor; the phase conductor includes a phase conductor and a first insulating layer covering the phase conductor, the phase conductor being made of pure copper; the neutral conductor includes a neutral conductor and a second insulating layer covering the neutral conductor, the neutral conductor being made of aluminum alloy.

2. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 1, characterized in that, Both the first insulating layer and the second insulating layer are cross-linked polyethylene insulating layers; a first elastic buffer layer is also provided between the second insulating layer and the neutral conductor, and the first elastic buffer layer is a EPDM rubber elastic layer.

3. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 2, characterized in that, The first insulating layer is 1.4~3.0mm thick.

4. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 3, characterized in that, The thickness of the second insulating layer is 0.6~1.4mm, and the thickness of the first elastic buffer layer is 0.8~1.6mm.

5. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 4, characterized in that, The phase conductor and the neutral conductor have similar cross-sectional areas, ranging from 16 to 300 mm². 2 .

6. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 5, characterized in that, The phase conductor is made of single wires with a diameter of 1.33~3.75 mm twisted together, with a twisting pitch ratio of 16~30D; the neutral conductor is made of single wires with a diameter of 1.68~3.75 mm twisted together, with a twisting pitch ratio of 12~30D.

7. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 6, characterized in that, The phase conductor and the neutral conductor are further provided with an inner lining layer, an armor layer and an outer sheath layer in sequence, and the space between the inner lining layer and the phase conductor and the neutral conductor is filled with filler.

8. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 7, characterized in that, The copper / aluminum alloy shared conductor economical low-voltage multi-core cable also includes a grounding core, which includes a grounding conductor and a second elastic buffer layer and a third insulation layer covering the grounding conductor. The grounding conductor is made of aluminum alloy.

9. The economical low-voltage multi-core cable with a copper / aluminum alloy shared conductor according to claim 8, characterized in that, The cross-sectional areas of the grounding conductor and the neutral conductor are equivalent.

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