Dry-type air-core reactor winding wire

Abstract

The utility model provides a kind of dry type hollow electric reactor winding wire.The winding wire includes: conductor, is equipped with insulating layer on outer wall;Strengthened grid skeleton, along the outer periphery of insulating layer winding arrangement;Epoxy resin glue is wrapped in the outer surface of strengthened grid skeleton and fills the interstice frame of strengthened grid skeleton.The utility model is wrapped in the outer surface of strengthened grid skeleton and fills the interstice of strengthened grid skeleton by the strengthened grid skeleton of insulating layer outer wrapping as the strengthening skeleton of epoxy resin glue, and epoxy resin glue solidifies after wrapping, to make strengthened grid skeleton, epoxy resin glue and insulating layer solidification form integral type reinforcing layer, strengthened grid skeleton effectively disperses the stress caused by electric reactor thermal change, tensile strength improves 30%-70%, reduce the risk of insulating layer erosion by epoxy crack, and then improve epoxy anti-cracking characteristics, strengthen the structural strength and insulating property of wire.

Description

Technical Field

[0001] This utility model relates to the field of power system technology, and more specifically, to a dry-type air-core reactor winding conductor. Background Technology

[0002] Dry-type air-core reactors are one of the main components in power transmission and transformation equipment. They are used to limit current, prevent overvoltage, and maintain the reactive power balance of the power system. They are characterized by simple insulation structure, strong short-circuit withstand capability, excellent linear characteristics, and convenient operation and maintenance, and are widely used in substations at all levels of power grids. However, as transmission voltage levels increase, transmission lines experience capacitive effects during no-load or light-load phases, leading to increased voltage at the conductor ends. This necessitates larger-capacity shunt reactors for reactive power compensation, resulting in increasingly larger rated currents for these reactors. Coupled with frequent switching operations, the impact of electrical and thermal stresses during operation becomes greater.

[0003] Conductors and their surface insulation layers are the core raw materials of dry-type air-core reactors. Failure analysis of faulty dry-type air-core reactors revealed that the epoxy encapsulation of the windings was aged and cracked, which could easily cause the conductors and their surface insulation layers to detach from the epoxy, leading to aging and failure of the insulation layer under external moisture and impurities. Summary of the Invention

[0004] In view of this, this utility model proposes a dry-type air-core reactor winding conductor, which aims to solve the problem that the epoxy encapsulation of the winding conductor in the existing dry-type air-core reactor winding conductor is prone to aging and cracking, which easily leads to the separation of the conductor and its surface insulation film layer from the epoxy, resulting in the aging and failure of the insulation layer under external moisture and impurities.

[0005] This utility model proposes a winding conductor for a dry-type air-core reactor. The winding conductor includes: a conductor with an insulating layer on its outer wall; a reinforcing mesh skeleton wound around the outer periphery of the insulating layer; and epoxy resin adhesive wrapped around the outer surface of the reinforcing mesh skeleton and filling the gaps in the reinforcing mesh skeleton. The reinforcing mesh skeleton, epoxy resin adhesive, and insulating layer are cured to form an integral reinforcing layer, and the reinforcing skeleton serves as a reinforcing skeleton for the epoxy resin adhesive.

[0006] Furthermore, in the aforementioned dry-type air-core reactor winding conductor, the reinforcing mesh skeleton includes: a first fiber strip and a second fiber strip; wherein the first fiber strip and the second fiber strip are respectively arranged in a spiral cross-winding arrangement along two spiral cross directions to form a bidirectional cross-winding mesh structure.

[0007] Furthermore, in the aforementioned dry-type air-core reactor winding conductors, both the first fiber strip and the second fiber strip are resin-impregnated glass fibers.

[0008] Furthermore, in the aforementioned dry-type air-core reactor winding conductor, the winding angle between the winding direction of the first fiber strip and / or the second fiber strip and the conductor axis is 30-60°.

[0009] Furthermore, in the aforementioned dry-type air-core reactor winding conductors, the thickness of the reinforcing mesh skeleton is less than or equal to 1 mm.

[0010] Furthermore, in the aforementioned dry-type air-core reactor winding conductors, the thickness of the reinforcing mesh skeleton is 0.2 mm or 0.8 mm.

[0011] Furthermore, in the aforementioned dry-type air-core reactor winding conductors, the reinforcing mesh skeleton has mesh holes, the longest diagonal of which is 3~5mm in length.

[0012] Furthermore, in the aforementioned dry-type air-core reactor winding conductor, the insulation layer includes a main insulating film unidirectionally wound on the outer wall of the conductor and an auxiliary insulating film unidirectionally wound on the outer wall of the main insulating film.

[0013] Furthermore, in the aforementioned dry-type air-core reactor winding conductors, the epoxy resin adhesive is epoxy resin.

[0014] The dry-type air-core reactor winding conductor provided by this utility model uses an insulation layer on the outside of the conductor to prevent overcurrent and leakage of current on the internal conductor. A reinforcing mesh skeleton wrapped around the insulation layer serves as a reinforcing skeleton for the epoxy resin adhesive. The epoxy resin adhesive wraps around the outer surface of the reinforcing mesh skeleton and fills the gaps in the reinforcing mesh skeleton, so that the reinforcing mesh skeleton, epoxy resin adhesive, and insulation layer cure to form an integrated reinforcing layer, i.e., a composite insulation layer. The reinforcing mesh skeleton can effectively disperse the stress caused by thermal changes in the reactor, increase the tensile strength by 30%-70%, reduce the risk of epoxy cracking of the insulation layer, and thus improve the epoxy's anti-cracking properties, strengthen the structural strength and insulation properties of the conductor. This solves the problem that the epoxy encapsulation on the winding conductors of existing dry-type air-core reactors is prone to aging and cracking, which can easily lead to the separation of the conductor and its surface insulation film from the epoxy, causing insulation layer aging and failure under external moisture and impurities. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of the winding conductor of the dry-type air-core reactor provided in this embodiment of the utility model; Figure 2A cross-sectional view of the winding conductor of a dry-type air-core reactor provided for an embodiment of this utility model; Explanation of reference numerals in the attached drawings: 1-conductor, 2-insulating layer, 21-main insulating film, 22-auxiliary insulating film, 3-reinforcing mesh skeleton, 31-mesh, 32-first fiber strip, 33-second fiber strip. Detailed Implementation

[0016] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] See Figures 1 to 2 The figure illustrates a preferred structure of the winding conductor of a dry-type air-core reactor provided by an embodiment of the present invention. As shown in the figure, the winding conductor of the dry-type air-core reactor includes: a conductor 1, an insulation layer 2, and a reinforcing mesh skeleton 3.

[0018] An insulating layer 2 is provided on the outer wall of the conductor 1.

[0019] Specifically, conductor 1 can be a metallic conductor, especially an aluminum conductor, for example, an aluminum conductor with a diameter of 2.5 mm. Conductor 1 can be a cylindrical structure with a circular cross-section. An insulating layer 2 is provided on the outer wall of conductor 1 to prevent overcurrent and leakage of current from the internal conductor 1. In this embodiment, the winding conductor of the dry-type air-core reactor can be a single-wire winding conductor or a fully transposed conductor. For single-wire winding conductors, such as... Figure 1 As shown, conductor 1 is a single conductor, and the outer wall of conductor 1 is covered with an insulating layer 2; for a fully transposed conductor, as... Figure 2 As shown, there can be multiple conductors 1, and multiple conductors 1 can be twisted together to form an integral stranded body. Furthermore, each conductor 1 has an insulating layer 2 on its outer wall, and the insulating layer 2 covers the outside of the corresponding conductor 1.

[0020] The reinforcing mesh skeleton 3 is wound around the outer periphery of the insulating layer 2, serving as a support skeleton for the epoxy resin adhesive impregnated on the insulating layer 2 and the reinforcing mesh skeleton 3. This allows the epoxy resin adhesive to cure, wrapping around the surface of the reinforcing mesh skeleton 3 and filling its gaps, thus forming an integral reinforcing layer with the insulating layer 2. Specifically, the reinforcing mesh skeleton 3 can be wound to the outer periphery of the insulating layer 2 using CNC winding.

[0021] For single-wire winding conductors, the reinforcing mesh skeleton 3 can be wound around the outer wall of the outer insulation layer 2 of the conductor 1, i.e., covered on the insulation layer 2. Epoxy resin can be impregnated onto the reinforcing mesh skeleton 3 and the insulation layer 2 so that after the epoxy resin cures, it coats the surface of the reinforcing mesh skeleton 3 and fills the gaps in the reinforcing mesh skeleton 3. The reinforcing mesh skeleton 3 and the insulation layer 2 form an integrated reinforcing layer, i.e., the reinforcing mesh skeleton 3 and the insulation layer 2 are bonded together by epoxy resin impregnation. The reinforcing mesh skeleton 3 serves as a supporting reinforcing skeleton for the epoxy resin. After the dry-type hollow reactor winding conductor is cured as a whole, the reinforcing mesh skeleton 3, the epoxy resin, and the insulation layer 2 form an integrated reinforcing layer. In other words, a mixed reinforcing layer, i.e., a composite insulation layer, is formed on the outer surface of the conductor 1. The reinforcing mesh skeleton 3 can effectively disperse the stress caused by thermal changes in the reactor, increase the tensile strength by 30%-70%, reduce the risk of epoxy cracking erosion of the insulation layer 2, and thus improve the epoxy crack resistance, strengthen the structural strength and insulation properties of the conductor.

[0022] For a fully transposed conductor, a reinforcing mesh skeleton 3 is integrally wound around the outside of a stranded body formed by multiple conductors 1. The reinforcing mesh skeleton 3 and the insulation layer 2 can be impregnated with epoxy resin so that after the epoxy resin cures, it coats the surface of the reinforcing mesh skeleton 3 and fills its gaps. Of course, the gaps between the reinforcing mesh skeleton 3 and the external insulation layer 2 of the multiple conductors 1 can also be filled with epoxy resin. The reinforcing mesh skeleton 3, the epoxy resin, and the various insulation layers 2 outside the multiple conductors 1 cure to form an integral reinforcing layer, i.e., the reinforcing mesh. The skeleton 3 and the insulation layer 2 are bonded together by epoxy resin impregnation. The reinforcing mesh skeleton 3 serves as a supporting and reinforcing skeleton for the epoxy resin. After the entire winding conductor of the dry-type hollow reactor is cured, the reinforcing mesh skeleton 3, the epoxy resin, and the insulation layer 2 form an integrated reinforcing layer. A mixed reinforcing layer is formed on the outer surface of the conductor 1, which serves as a composite insulation layer. The reinforcing mesh skeleton 3 can effectively disperse the stress caused by the thermal changes of the reactor, increase the tensile strength by 30%-70%, reduce the risk of epoxy cracking of the insulation layer, and thus improve the epoxy crack resistance, strengthen the structural strength and insulation properties of the conductor.

[0023] See also Figure 1 The reinforcing mesh skeleton 3 has mesh openings 31 to ensure sufficient impregnation between the reinforcing mesh skeleton 3 and the epoxy resin adhesive. In this embodiment, the mesh openings 31 can be diamond-shaped, forming a diamond-shaped mesh structure. The length L of the longest diagonal of the diamond-shaped mesh opening can be determined based on the diameter of the conductor 1. In this embodiment, the length L of the longest diagonal of the diamond-shaped mesh opening can be 3~5mm.

[0024] In this embodiment, the thickness of the reinforcing mesh skeleton 3 is less than or equal to 1 mm; preferably, the thickness of the reinforcing mesh skeleton can be 0.2 mm or 0.8 mm.

[0025] See also Figure 1 The insulating layer 2 includes a main insulating film 21 unidirectionally wound on the outer wall of the conductor 1 and an auxiliary insulating film 22 unidirectionally wound on the outer wall of the main insulating film 21. Specifically, the main insulating film 21 can be a smooth plastic film structure, and the auxiliary insulating film 22 can be a plastic film with a rough outer surface to facilitate the bonding of epoxy resin. For example, the main insulating film 21 and the auxiliary insulating film 22 can be polyester film or polyimide film, both of which can be sequentially wound onto the outer wall of the conductor 1 using a unidirectional winding method. The sum of the thicknesses of the main insulating film 21 and the auxiliary insulating film 22 can be 0.2 mm. Of course, the insulating layer 2 can also be a single-layer insulating film, such as a 0.2 mm polyester film insulating layer.

[0026] See also Figure 1 The reinforcing mesh skeleton 3 includes: a first fiber strip 32 and a second fiber strip 33; wherein the first fiber strip 32 and the second fiber strip 33 are respectively arranged in a helical cross-winding pattern along two helical directions to form a bidirectional cross-winding mesh structure. Specifically, the first fiber strip 32 and the second fiber strip 33 can be cross-wound along two helical directions on the surface of the insulating layer 2 to form the reinforcing mesh skeleton 3. The winding direction of the first fiber strip 32 and the second fiber strip 33 is perpendicular to the axial direction of the conductor 1 (e.g., ...). Figure 1 The winding angle between the two fibers (shown in the horizontal direction) is 30-60°, that is, the helix angle can be 30-60°. In this embodiment, both the first fiber strip 32 and the second fiber strip 33 are glass fiber filaments. In this embodiment, the first fiber strip 32 and the second fiber strip 33 can be cross-wound along two helical directions on the surface of the insulating layer 2 to form a reinforcing mesh skeleton 3. The first fiber strip 32 and the second fiber strip 33 can be cross-wound along left-hand and right-hand helical directions respectively to form a reinforcing mesh skeleton 3, that is, to form a bidirectional cross-reinforced mesh structure. In other words, the reinforcing mesh skeleton 3 is formed by the cross-connection of the first fiber strip 32 wound along the left-hand helical direction and the second fiber strip 33 wound along the right-hand helical direction. The first fiber strip 32 and the second fiber strip 33 can be cross-wound in a bidirectional cross-symmetrical manner, and there are mesh holes 31 between the first fiber strip 32 and the second fiber strip 33. The first fiber strip 32 and the second fiber strip 33 can both be flat bundles of alkali-free glass fiber with a thickness of 0.3 mm and a width of 0.7 mm. They are wound in a cross-winding manner with a spacing of 3 mm, i.e., the longest diagonal of the mesh 31 is 3 mm, ±45°, and after curing, they form a reinforcing layer with a thickness of 0.3 mm.

[0027] In this embodiment, when the conductor diameter is 2.0 mm, the longest diagonal of the mesh can be 3 mm; when the conductor diameter is 3.0 mm, the longest diagonal of the mesh can be 4 mm; and when the conductor diameter is 4.0 mm, the longest diagonal of the mesh can be 5 mm. Of course, when the conductor diameter is greater than or equal to 2 mm and less than 3 mm, the longest diagonal of the mesh can be 3 mm; when the conductor diameter is greater than or equal to 3 mm and less than 4 mm, the longest diagonal of the mesh can be 4 mm; and when the conductor diameter is greater than or equal to 4 mm and less than 5 mm, the longest diagonal of the mesh can be 5 mm.

[0028] In summary, the dry-type air-core reactor winding conductor provided in this embodiment, through the insulation layer 2 set outside the conductor 1, avoids overcurrent and leakage of current on the internal conductor 1; the reinforcing mesh skeleton 3 wrapped around the insulation layer 2 serves as the reinforcing skeleton for the epoxy resin adhesive. The epoxy resin adhesive wraps around the outer surface of the reinforcing mesh skeleton 3 and fills the gaps in the reinforcing mesh skeleton 3, so that the reinforcing mesh skeleton 3, epoxy resin adhesive and the insulation layer 2 are cured to form an integrated reinforcing layer, i.e., a composite insulation layer. The reinforcing mesh skeleton 3 can effectively disperse the stress caused by the thermal changes of the reactor, increase the tensile strength by 30%-70%, reduce the risk of epoxy cracking of the insulation layer 2, and thus improve the epoxy crack resistance, strengthen the structural strength and insulation properties of the conductor, and solve the problem that the epoxy encapsulation of the winding conductor in the existing dry-type air-core reactor winding conductor is prone to aging and cracking, which can easily lead to the separation of the conductor and its surface insulation film layer from the epoxy, resulting in insulation layer aging failure under external moisture and impurities.

[0029] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0030] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A winding conductor for a dry-type air-core reactor, characterized in that, include: A conductor, wherein an insulating layer is provided on the outer wall of the conductor; A reinforcing mesh skeleton is wound around the outer periphery of the insulating layer to serve as a support skeleton for the epoxy resin adhesive impregnated on the insulating layer and the reinforcing mesh skeleton, so that after the epoxy resin adhesive cures, it wraps around the surface of the reinforcing mesh skeleton and fills the gaps of the reinforcing mesh skeleton, and the reinforcing mesh skeleton and the insulating layer form an integral reinforcing layer.

2. The dry-type air-core reactor winding conductor according to claim 1, characterized in that, The reinforcing mesh skeleton includes: a first fiber strip and a second fiber strip; wherein... The first fiber strip and the second fiber strip are arranged in a spiral cross-winding pattern along two spiral intersection directions to form a bidirectional cross-winding mesh structure.

3. The dry-type air-core reactor winding conductor according to claim 2, characterized in that, Both the first fiber strip and the second fiber strip are glass fiber filaments.

4. The dry-type air-core reactor winding conductor according to claim 2, characterized in that, The winding angle between the winding direction of the first fiber strip and / or the second fiber strip and the axial direction of the conductor is 30-60°.

5. The dry-type air-core reactor winding conductor according to any one of claims 1 to 4, characterized in that, The thickness of the reinforced mesh skeleton is less than or equal to 1 mm.

6. The dry-type air-core reactor winding conductor according to claim 5, characterized in that, The thickness of the reinforced mesh skeleton is 0.2 mm or 0.8 mm.

7. The dry-type air-core reactor winding conductor according to any one of claims 1 to 4, characterized in that, The reinforced mesh skeleton has mesh holes, and the longest diagonal of the mesh is 3-5 mm long.

8. The dry-type air-core reactor winding conductor according to any one of claims 1 to 4, characterized in that, The insulating layer includes a main insulating film unidirectionally wound on the outer wall of the conductor and an auxiliary insulating film unidirectionally wound on the outer wall of the main insulating film.

9. The dry-type air-core reactor winding conductor according to any one of claims 1 to 4, characterized in that, Both the main insulating film and the auxiliary insulating film are polyester films or polyimide films.

10. The dry-type air-core reactor winding conductor according to any one of claims 1 to 4, characterized in that, The conductor is an aluminum conductor.

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