Improved paper-clad copper-clad aluminum transposed wire for electric reactor

Abstract

The utility model relates to the technical field of cables, in particular to an improved paper-clad copper-clad aluminum transposed wire for an electric reactor, which comprises an inner conductor, the inner conductor is a copper-clad aluminum wire, the copper-clad aluminum wire comprises an aluminum core wire and a copper strip, the copper strip is coated on the aluminum core wire to form the copper-clad aluminum wire, and the copper strip is coated on the copper-clad aluminum wire. The outer surface of the copper-clad aluminum conductor is plated with a layer of insulating paint to form an enameled copper-clad aluminum round wire, the outer surface of the enameled copper-clad aluminum round wire is coated with insulating paper, the enameled copper-clad aluminum round wire is twisted and transposed to form an even number of aluminum stranded wires which are arranged in an upper row and a lower row, and the periphery of the aluminum stranded wires is coated with at least one layer of insulating paper; compared with the prior art, the copper sheet with a certain thickness is plated outside the pure aluminum wire, and a layer of H-level insulating paint is plated on the outer surface of the copper, so that the material cost can be saved, the product weight can be reduced, the product conductivity can be improved, and the creep resistance of the winding wire can be enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly relates to an improved paper-covered copper-clad aluminum transposed wire for a reactor. Background Art

[0002] At present, in the existing reactor winding cables, pure aluminum wires are light in weight and low in price, but have poor creep resistance. As winding wires, they are prone to deformation and loosening, resulting in reactor noise. Pure copper wires have good electrical conductivity and relatively small deformation, but are high in price and heavy in weight. In addition, film-covered transposed wires are suitable for dry-type reactors, and paper-covered transposed wires are more suitable for oil-immersed reactors because the insulating strength of oil and paper is higher. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the above-mentioned deficiencies and provide an improved paper-covered copper-clad aluminum transposed wire for a reactor, which can not only save material costs, reduce the product weight, but also improve the product conductivity and enhance the creep resistance of the winding wire.

[0004] To achieve the above purpose, an improved paper-covered copper-clad aluminum transposed wire for a reactor is designed, which includes an inner conductor. The inner conductor is a copper-clad aluminum wire, and the copper-clad aluminum wire includes an aluminum core wire 1 and a copper tape 2. The copper tape 2 is coated on the aluminum core wire 1 to form the copper-clad aluminum wire. A layer of insulating paint 3 is plated on the outer surface of the copper-clad aluminum wire to form an enameled copper-clad aluminum round wire, and an insulating paper 4 is coated on the outer surface of the enameled copper-clad aluminum round wire.

[0005] Further, the enameled copper-clad aluminum round wire is twisted and transposed to form an even number of aluminum stranded wires arranged in two rows up and down. At least one layer of insulating paper 4 is coated on the periphery of the aluminum stranded wires, so that the stranded wire forming is more stable.

[0006] Further, at least four aluminum stranded wires are provided, so that the structure is more reliable after twisting and transposing an even number of them.

[0007] Further, the insulating paper 4 is a self-locking insulating paper, so as to prevent the insulating paper 4 from peeling off.

[0008] Further, the self-locking insulating paper is formed by overlapping multiple paper tapes. Multiple paper tapes are stacked up and down to wind and wrap to form a self-locking insulating paper layer. This self-locking insulating paper structure can make there be no gap between the self-locking winding layers, and the winding is flat, thus better ensuring the performance of the product.

[0009] Further, the whole formed after the enameled copper-clad aluminum round wire is coated with the insulating paper 4 is in a circular structure or a square structure.

[0010] Furthermore, in the gap between the insulating paper 4 and the enameled copper-clad aluminum round wire, and between adjacent enameled copper-clad aluminum round wires within the insulating paper 4, an insulating adhesive 5 is filled. The expansion coefficient of the insulating adhesive is close to that of the conductor material and it is insoluble in the special oil product, enabling the enameled copper-clad aluminum round wires to form a whole through the insulating adhesive, thereby achieving a high waterproof effect and being less likely to generate noise.

[0011] Furthermore, on the cross-section of the copper-clad aluminum wire, the area of the copper layer accounts for 8%-17% of the area of the entire copper-clad aluminum wire, thereby effectively ensuring the consistency and reliability of its performance.

[0012] The present utility model also provides a reactor, which includes the above-mentioned improved reactor paper-covered copper-clad aluminum transposed wire.

[0013] Compared with the prior art, the present utility model adopts a pure aluminum wire plated with a certain thickness of copper skin, and then a layer of H-class insulating paint is plated on the outer surface of the copper. This can not only save material costs and reduce the product weight, but also improve the product conductivity and enhance the anti-creep property of the winding wire. Moreover, after the single-round aluminum wire is transposed, the cable paper is used as the outer insulation, which is more suitable for oil-immersed reactors. The oil-paper insulation can increase the outer insulation performance by 5-10 times. In addition, the present utility model not only takes into account the excellent characteristics of copper and aluminum, but also has a low price. At the same time, through the improvement of the electrical design, it has become a special raw material for the reactor winding and is worthy of popularization and application. [Description of the Drawings]

[0014] Figure 1 is the structural schematic diagram of Embodiment 1 of the present utility model;

[0015] Figure 2 is the structural schematic diagram of Embodiment 2 of the present utility model;

[0016] Figure 3 is the structural schematic diagram of Embodiment 3 of the present utility model;

[0017] Figure 4 is the structural schematic diagram of the aluminum core wire and the copper strip of the present utility model;

[0018] In the figure: 1. Aluminum core wire 2. Copper strip 3. Insulating paint 4. Insulating paper 5. Insulating adhesive. [Detailed Embodiments]

[0019] The following further describes the present utility model in conjunction with the drawings:

[0020] As shown in the attached Figure 1 to the attached Figure 4As shown, the present utility model provides a new type of reactor winding cable - paper-covered copper-clad aluminum transposed wire. Specifically, it is an improved paper-covered copper-clad aluminum transposed wire for reactors, which includes an inner conductor. The inner conductor is a copper-clad aluminum wire, and the copper-clad aluminum wire includes an aluminum core wire 1 and a copper strip 2. The copper strip 2 is coated on the aluminum core wire 1 to form the copper-clad aluminum wire. A layer of insulating paint 3 is plated on the outer surface of the copper-clad aluminum wire to form an enameled copper-clad aluminum round wire, and an insulating paper 4 is coated on the outer surface of the enameled copper-clad aluminum round wire.

[0021] Among them, the enameled copper-clad aluminum round wire forms an even number of aluminum stranded wires arranged in two rows up and down through stranding and transposition. At least one layer of insulating paper 4 is coated on the periphery of the aluminum stranded wires, so that the stranded wire forming is more stable; at least four aluminum stranded wires are provided, so that the structure is more reliable after an even number of stranding and transposition. The area of the copper layer in the cross-section of the copper-clad aluminum wire accounts for 8%-17% of the area of the entire copper-clad aluminum wire, so as to effectively ensure the consistency and reliability of its performance.

[0022] The whole formed after the enameled copper-clad aluminum round wire is coated with the insulating paper 4 is in a circular structure or a square structure. As shown in the appendix Figure 1 it is a circular structure, and as shown in appendix Figure 2 and appendix Figure 3 it is a square structure; in the gap between the insulating paper 4 and the enameled copper-clad aluminum round wire, and between adjacent enameled copper-clad aluminum round wires in the insulating paper 4, insulating glue 5 is filled, so that the enameled copper-clad aluminum round wires become an integral whole through the insulating glue, which can ensure that the enameled copper-clad aluminum round wires are not eroded by water or water vapor. Moreover, since the enameled copper-clad aluminum round wires become an integral whole through the insulating glue, there is no gap between the enameled copper-clad aluminum round wires, so that the vibration of a single enameled copper-clad aluminum round wire can be avoided, the noise is reduced, and it has the advantages of high waterproof effect and not easy to generate mechanical noise.

[0023] The insulating paper 4 is a self-locking insulating paper, so as to prevent the insulating paper 4 from peeling off; the self-locking insulating paper is formed by overlapping multiple paper tapes, and multiple paper tapes are stacked up and down to form a self-locking insulating paper layer. This self-locking insulating paper structure can make there be no gap between the self-locking winding layers, and the winding is flat, so as to better ensure the performance of the product.

[0024] The present utility model also provides a reactor, and the reactor includes the above-mentioned improved paper-covered copper-clad aluminum transposed wire for reactors.

[0025] The product structure of the utility model is mainly an enameled copper-clad aluminum round wire, with an even number of strands (at least 4 strands, even number) twisted and transposed, and one or more layers of insulating paper are wrapped after transposition. It uses a pure aluminum wire with a certain thickness of copper plating on the outside, and a layer of H-class insulating paint is plated on the outer surface of the copper, which can not only save material costs and reduce the product weight, but also improve the conductivity of the product and enhance the anti-creep property of the winding wire; and after the single-round aluminum wire is transposed, cable paper is used as the outer insulation, which is more suitable for oil-immersed reactors. Since the round wire is plated with insulating paint on the outside, the friction between the wires during twisting and transposition is reduced. When the product has a large aspect ratio, such as 7 or more in the horizontal row and 2 in the vertical row, the wires are prone to non-forming or jumping during twisting. A new tooling and stabilizing device is adopted, and at the same time, the traction device is improved to make the wire twisting more stable.

[0026] In order to ensure the uniformity of the copper plating layer in the utility model, the surface of the round aluminum wire needs to be smooth and flat, and the roundness of the round aluminum wire should be much higher than the national standard; in order to ensure that the outer insulating paint is not damaged or scraped off during the twisting process, non-metallic guide wheels and guide pipes can be installed, and the withstand voltage is measured online, and the finished product is tested for open circuit. And the outermost insulating paper can adopt a self-locking structure, so as to prevent the insulating paper from peeling off.

[0027] In the utility model, a wire in which a copper layer is continuously and uniformly coated on an aluminum core wire and the contact surface between the copper and the aluminum forms an atomic bond is called a copper-clad aluminum wire, and its shape is as shown in the appendix Figure 4 shown. The ratio of the copper layer area to the area of the entire copper-clad aluminum wire in its cross-section is called the copper layer area ratio (or volume ratio). The utility model preferably has a copper layer volume ratio in the range of 8% - 17%, so as to effectively ensure the consistency and reliability of the base material performance.

[0028] The utility model uses copper-clad aluminum wire as the inner conductor, and the electromagnetic wire produced by the enameling process is copper-clad aluminum enameled wire. The use of this copper-clad aluminum enameled wire mainly has the following advantages: (1) Using copper-clad aluminum wire can greatly reduce the cost of the reactor winding. The copper-clad aluminum wire has a small density and light weight. Using this wire can reduce the mass of the electrical appliance and reduce the labor intensity of workers, which is beneficial to the transportation and installation of the product. (2) From the mass ratio of copper in the wire, it can be seen that the utility model can save scarce copper resources, and the specific heat of the copper-clad aluminum wire is larger than that of the copper wire. Therefore, under the conditions of the same resistance, current and energization time, the temperature rise of the winding is lower, the aging process of the insulation is prolonged, and the service life of the electrical appliance is improved. (3) From the mechanical properties of the wire, whether it is soft or hard copper-clad aluminum wire, its tensile strength or elongation is lower than that of pure copper wire, but it is sufficient to meet the requirements of the winding for mechanical properties, and it is easier to wind the winding with a wire of lower strength. (4) Compared with aluminum wire, although the density of copper-clad aluminum wire is not as small as that of aluminum and the specific heat is not as large as that of aluminum, the resistivity of copper-clad aluminum wire is smaller, and its surface is all pure copper, which overcomes the disadvantages of aluminum being easy to oxidize, corrode and difficult to braze. It can be seen that the copper-clad aluminum wire not only combines the excellent characteristics of copper and aluminum, but also has a low price, and can become a special raw material for the reactor winding. (5) The copper-clad aluminum wire can achieve different copper-aluminum content ratios according to different mechanical and electrical parameter requirements, and the performance can be flexible and variable.

[0029] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The standard parts used can be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

[0030] The utility model is not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the utility model shall be equivalent replacement methods and shall be included in the protection scope of the utility model.

Claims

1. An improved paper-covered copper-clad aluminum transposed wire for reactors, characterized in that: It includes an inner conductor, and the inner conductor is a copper-clad aluminum wire. The copper-clad aluminum wire includes an aluminum core wire (1) and a copper strip (2). The copper strip (2) is coated on the aluminum core wire (1) to form the copper-clad aluminum wire. A layer of insulating paint (3) is plated on the outer surface of the copper-clad aluminum wire to form an enameled copper-clad aluminum round wire, and an insulating paper (4) is coated on the outer surface of the enameled copper-clad aluminum round wire.

2. The improved reactor paper-covered copper-clad aluminum transposed wire according to claim 1, characterized in that: The enameled copper-clad aluminum round wire forms an even number of aluminum stranded wires arranged in two rows up and down through stranding and transposition, and at least one layer of insulating paper (4) is coated on the periphery of the aluminum stranded wires.

3. The improved reactor paper-covered copper-clad aluminum transposed wire according to claim 2, characterized in that: There are at least four of the aluminum stranded wires.

4. The improved reactor paper-covered copper-clad aluminum transposed wire as described in claim 1, characterized in that: The insulating paper (4) is a self-locking insulating paper to prevent the insulating paper (4) from peeling off.

5. The improved reactor paper-covered copper-clad aluminum transposed wire according to claim 4, characterized in that: The self-locking insulating paper is formed by overlapping multiple paper tapes, and multiple paper tapes are stacked up and down and wound to form a self-locking insulating paper layer.

6. The improved reactor paper-covered copper-clad aluminum transposed wire according to claim 1, characterized in that: The whole formed after the enameled copper-clad aluminum round wire is coated with the insulating paper (4) has a circular structure or a square structure.

7. The improved reactor paper-covered copper-clad aluminum transposed wire as claimed in claim 1, wherein: In the gap between the insulating paper (4) and the enameled copper-clad aluminum round wire, and between adjacent enameled copper-clad aluminum round wires in the insulating paper (4), an insulating glue (5) is filled.

8. The improved reactor paper-covered copper-clad aluminum transposed wire according to claim 1, wherein: On the cross-section of the copper-clad aluminum wire, the area of the copper layer accounts for 8%-17% of the area of the whole copper-clad aluminum wire.

9. A reactor, characterized in that: It includes an improved reactor paper-covered copper-clad aluminum transposed wire as described in any one of claims 1 to 8.

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