Extra-high voltage composite conductor

Abstract

The invention relates to the technical field of power transmission equipment, in particular to an extra-high voltage combined wire, and aims to improve the mechanical stability, the electrical insulation performance and the heat dissipation effect of the wire. Comprising a copper flat wire, an insulating paint layer, a self-adhesive paint layer, an insulating wire and an insulating paper layer. The insulating paint layer is coated on the surface of the outer side of the copper flat wire, insulating wires are spirally wound on the surface of the insulating paint layer along the length direction of the copper flat wire, and a self-adhesive paint layer is filled between two adjacent circles of insulating wires. Through the structural design, the mechanical strength and the electrical insulation capacity of the wire can be remarkably enhanced under the extreme conditions of high pressure, high temperature, vibration and the like, the heat dissipation performance is optimized, the operation reliability of the wire is improved, and the service life of the wire is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission equipment, and in particular to an ultra-high voltage combined conductor. Background Art

[0002] In the design and manufacturing process of ultra-high voltage transformers, the performance of winding conductors directly affects the electrical performance, efficiency and reliability of the transformer. Traditional transformer winding conductors usually use transposed conductors to balance current distribution, reduce leakage magnetic field and eddy current losses, and thus improve the efficiency and stability of the transformer. The structural design of traditional transposed conductors often includes a combination of enameled wire and self-adhesive paint, in which a layer of self-adhesive paint is coated on the surface of the enameled wire, and through a fine transposition pitch design, the bonding effect formed by the self-adhesive paint after melting in a high temperature environment is used to achieve the fixation and insulation of the enameled wire. This design can provide certain mechanical support and insulation performance under normal working conditions.

[0003] However, as the performance requirements of UHV transformers for winding conductors continue to increase, the traditional transposed conductor design has gradually exposed some shortcomings. Under extreme environments such as high temperature, high pressure and strong vibration, self-adhesive paint is prone to aging and melting, resulting in a decrease in insulation performance, which in turn increases friction and wear between enameled wires. In this case, the wires are prone to problems such as insufficient mechanical strength and electrical insulation failure, which seriously affect the operating stability and service life of the transformer. In addition, the traditional self-adhesive paint design requires fine control during processing and manufacturing, which increases process complexity and cost. Summary of the invention

[0004] In view of this, the present invention proposes an ultra-high voltage combined conductor, aiming to improve the mechanical stability and electrical insulation performance of the ultra-high voltage combined conductor through a more reasonable structural design.

[0005] The technical solution of the present invention is achieved as follows: the present invention provides an ultra-high voltage combined conductor, comprising: a copper flat wire, an insulating paint layer, a self-adhesive paint layer, an insulating wire and an insulating paper layer, the insulating paint layer is coated on the outer surface of the copper flat wire, the surface of the insulating paint layer is spirally wound with an insulating wire along the length direction of the copper flat wire, the self-adhesive paint layer is filled between two adjacent turns of the insulating wire, an odd number of and at least three copper flat wires are spirally transposed, the winding directions of the insulating wires on the surfaces of adjacent copper flat wires along the transposed spiral direction are opposite, and the insulating wires on the surfaces of the copper flat wires all abut against the insulating paint layer surface of the adjacent copper flat wire on their side.

[0006] In some embodiments, the insulation wires on the surfaces of two adjacent copper flat wires abut against each other.

[0007] In some embodiments, a spiral groove is opened on the surface of the copper flat wire, the insulating wire is embedded in the spiral groove, and the insulating wire protrudes from the surface of the insulating paint layer on both sides of the spiral groove.

[0008] In some embodiments, the depth of the spiral groove is 1 / 3-1 / 2 of the height of the insulating wire.

[0009] In some embodiments, the helical pitch of the insulating wire is 2-3 times the width of the insulating wire.

[0010] In some embodiments, the winding angle of the insulated wire is 30-45°.

[0011] In some embodiments, the helical pitch of the insulated wire is 0.4-0.5 times the width of the copper flat wire.

[0012] In some embodiments, the height of the insulating wire is 0.3-0.4 times the thickness of the copper flat wire.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention uses an insulating wire spirally wound on the surface of the copper flat wire, and fills the gaps between adjacent insulating wires with a self-adhesive paint layer. The insulating wires on the surfaces of adjacent copper flat wires support each other, which increases the mechanical support and stability of the wires and can maintain the shape and structural integrity of the wires in high-voltage and high-temperature environments. The multi-layer insulation structure provides effective electrical isolation, reduces the risk of electrical breakdown and leakage between wires, and improves the insulation reliability of the wires. The structural design combining the insulating wire and the self-adhesive paint avoids insulation failure caused by aging of the self-adhesive paint, while providing additional mechanical support and enhancing the fatigue resistance and service life of the wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a cross-sectional view of the UHV combined conductor of the present invention;

[0017] Figure 2 It is an axonometric diagram of the copper flat wire and the insulated wire in the UHV combined conductor of the present invention;

[0018] Figure 3 It is an axonometric view of one embodiment of the copper flat wire in the ultra-high voltage combined conductor of the present invention.

[0019] In the figure: 1-copper flat wire, 2-insulating paint layer, 3-self-adhesive paint layer, 4-insulating wire, 5-insulating paper layer, 11-spiral groove. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the embodiments of the present invention belong. If the definitions set forth in this section are contrary to or otherwise inconsistent with the definitions set forth in the patents, patent applications, published patent applications, and other publications incorporated herein by reference, the definitions listed in this section take precedence over the definitions incorporated herein by reference.

[0024] like Figure 1 As shown, combined Figure 2-3 The ultra-high voltage combined conductor of the present invention comprises: a copper flat wire 1, an insulating varnish layer 2, a self-adhesive varnish layer 3, an insulating wire 4 and an insulating paper layer 5, the insulating varnish layer 2 is coated on the outer surface of the copper flat wire 1, the surface of the insulating varnish layer 2 is spirally wound with an insulating wire 4 along the length direction of the copper flat wire 1, and the self-adhesive varnish layer 3 is filled between two adjacent turns of the insulating wire 4, an odd number of and at least three copper flat wires 1 are spirally transposed, and the winding directions of the insulating wires 4 on the surfaces of adjacent copper flat wires 1 along the transposed spiral direction are opposite, and the insulating wires 4 on the surface of the copper flat wire 1 all abut against the surface of the insulating varnish layer 2 of the adjacent copper flat wire 1 on the side where they are located.

[0025] In the above embodiments, the insulating wire 4 is spirally wound along the length direction of the copper flat wire 1, and a stable physical isolation structure is formed by close contact with the insulating paint layer 2 of the copper flat wire 1. The insulating wires 4 of adjacent copper flat wires 1 are wound in opposite directions, so that the insulating wires 4 can support and self-lock each other to prevent displacement or loosening under high pressure or high temperature conditions. This design increases the deformation resistance of the wire under mechanical stress, improves the mechanical stability of the wire under vibration or impact conditions, and effectively avoids insulation failure and short circuit problems caused by wire movement or friction.

[0026] The self-adhesive paint layer 3 is filled between adjacent insulated wires 4, and ensures the tight bonding between the insulated wires 4 and the copper flat wire 1 by providing bonding force during installation or operation. The self-adhesive paint layer 3 can be further melted and solidified under high temperature conditions, providing stable mechanical bonding force to prevent the insulated wires 4 from loosening or falling off due to thermal expansion and contraction during high temperature or long-term operation. This design reduces the reliance on traditional mechanical clamps or binding methods, simplifies the installation process of the wires, and improves the overall structural stability and insulation reliability of the wires.

[0027] At the same time, the multiple insulation design of the insulating paint layer 2, the insulating wire 4 and the insulating paper layer 5 provides effective electrical isolation, prevents electric field concentration and electrical breakdown, and improves the insulation performance and withstand voltage of the conductor in an ultra-high voltage environment. The spiral winding and mutual support structure design of the insulating wire 4 ensures that the insulation structure of the conductor will not have electrical breakdown or current leakage under high voltage conditions, thereby improving the safety and reliability of the conductor.

[0028] In some embodiments, the insulating wires 4 on the surfaces of two adjacent copper flat wires 1 abut against each other.

[0029] In the above embodiment, the insulating wire 4 is spirally wound along the length direction of the copper flat wire 1, and the insulating wires on two adjacent copper flat wires are wound in opposite directions. Such a design enables the insulating wires on the surfaces of adjacent copper flat wires to resist each other when they come into contact with each other, and can provide additional physical support and limiting effect when the wire is subjected to mechanical shock or vibration, thereby preventing the displacement or separation of adjacent copper flat wires. This structural design significantly improves the mechanical stability and fatigue resistance of the wire under high pressure, high temperature and strong vibration environments.

[0030] The insulated wire is fixed on the surface of the copper flat wire by spiral winding, and a self-locking structure is formed between adjacent copper flat wires. This mutual support design not only improves the overall mechanical strength of the wire, but also effectively prevents the wire from sliding or loosening under high temperature, vibration or impact conditions.

[0031] The design of the mutually supporting structure of the insulated wires makes the insulation distance between adjacent copper flat wires more uniform, which helps to evenly distribute the electric field, reduce the electric field concentration effect, and thus reduce the risk of local breakdown. The design of the mutually supporting insulated wires can keep the insulated wires between the copper flat wires tightly fitted, avoiding insulation failure or electrical breakdown caused by environmental changes (such as temperature changes, mechanical stress, etc.). At the same time, the multi-layer insulation design provides multiple layers of protection, further improving the withstand voltage performance and insulation reliability of the wire. This design can also effectively reduce electromagnetic interference and magnetic leakage, optimize electrical performance, and improve the operating efficiency of the transformer.

[0032] Since the spiral winding and mutual abutment design of the insulated wire can provide better mechanical and electrical properties, the wire is less likely to wear, loosen or have insulation failure problems during long-term use, thereby extending the service life of the wire and improving the overall reliability and operational safety of the transformer.

[0033] In some embodiments, a spiral groove 11 is formed on the surface of the copper flat wire 1 , and the insulating wire 4 is embedded in the spiral groove 11 , and the insulating wire 4 protrudes from the surface of the insulating paint layer 2 on both sides of the spiral groove 11 .

[0034] In the above embodiment, a spiral groove 11 is provided on the surface of the copper flat wire 1, and the groove is spiral along the length direction of the copper flat wire 1. This groove design provides a guide groove, so that the insulating wire 4 can be accurately embedded therein. By providing the spiral groove 11, the insulating wire 4 can be more stably fixed on the surface of the copper flat wire during the winding process, preventing the insulating wire 4 from being displaced or slipped due to vibration or thermal stress during use.

[0035] The insulating wire 4 is embedded in the spiral groove 11, and part of it protrudes from the surface of the insulating paint layer 2 on both sides of the groove. Such a design ensures the stability of the insulating wire 4 on the surface of the copper flat wire 1, while increasing the contact area between the insulating wire 4 and the adjacent copper flat wire 1, and enhancing the mechanical support and limiting effect between adjacent wires. The protruding insulating wire part forms a physical isolation between adjacent copper flat wires, reduces the direct contact between the wires, and thus improves the electrical insulation performance of the wires.

[0036] In some embodiments, the depth of the spiral groove 11 is 1 / 3-1 / 2 of the height of the insulating wire 4 .

[0037] In the above embodiment, the groove depth is 1 / 3 to 1 / 2 of the height of the insulating wire, so that the insulating wire 4 can be firmly embedded in the surface of the copper flat wire 1, providing stable physical support. Such a design reduces the risk of loosening or displacement of the insulating wire 4 under vibration or high temperature conditions, and improves the overall mechanical stability and vibration resistance of the wire. This design can increase the fixation of the insulating wire without significantly increasing the thickness of the copper flat wire, and is suitable for use under high voltage and high mechanical stress conditions.

[0038] Due to the reasonable ratio of the groove depth and the height of the insulating wire 4, when the insulating wire 4 is embedded in the groove, its protruding part effectively increases the insulation distance between the copper flat wires, which helps to evenly distribute the electric field and reduce the risk of electrical breakdown. The moderate groove depth can also prevent the insulating wire from being completely embedded, avoiding the problem of reducing the electrical insulation effect due to excessive embedding of the insulating wire.

[0039] In some embodiments, the helical pitch of the insulating wire 4 is 2-3 times the width of the insulating wire 4 .

[0040] In the above embodiments, the spiral pitch of the insulating wire is 2-3 times its width, so that the insulating wire forms a uniform spiral winding layer on the surface of the copper flat wire. Such a design can effectively prevent electric field concentration, contribute to the uniform distribution of the electric field, and reduce the risk of breakdown caused by excessive local electric field strength. The spacing between the insulating wires provides multiple electrical isolation layers for the wire, improves the insulation performance and voltage resistance of the wire, and can significantly reduce the risk of electrical breakdown, especially in high voltage application scenarios.

[0041] The helical pitch of the insulated wire is 2-3 times its width. This design can evenly distribute the stress of the insulated wire during winding and reduce the mechanical stress concentration caused by winding too tight or too loose. Under high temperature, vibration or mechanical shock conditions, the appropriate helical pitch can reduce direct friction and wear between the insulated wires, enhance the fatigue resistance of the wire, and extend the service life of the wire.

[0042] Due to the reasonable ratio of spiral pitch and insulation wire width, the wire can better disperse mechanical stress during use, reducing the risk of structural deformation and insulation damage caused by external force or thermal stress. This design can maintain the shape stability and electrical performance of the wire under different working conditions and meet the needs of various application scenarios.

[0043] In some embodiments, the winding angle of the insulating wire 4 is 30-45°.

[0044] In the above embodiments, the winding angle is 30-45°, so that the insulated wire forms a self-locking structure during the spiral winding process. The spiral winding within this angle range can provide additional support and resistance between adjacent wires to prevent the insulated wire from sliding or falling off under high pressure, high temperature and vibration conditions. The self-locking effect helps to improve the mechanical stability and fatigue resistance of the wire, especially in high vibration or impact environments, effectively reducing the risk of displacement and loosening of the insulated wire.

[0045] The 30-45° winding angle provides a moderate electrical isolation layer, which enables uniform electrical isolation between insulated wires. This angle range can maximize the use of the insulating material of the insulated wires and avoid the risk of breakdown caused by excessive local electric fields. This design helps to ensure the insulation performance of the wires under high voltage and reduce the risk of leakage current and electrical failure.

[0046] The appropriate winding angle can effectively disperse the mechanical stress on the wire during use and reduce the risk of insulation wear or breakage caused by external force or thermal stress. By optimizing the winding angle, the wire can better resist external shock and vibration, maintaining structural stability and electrical performance.

[0047] In some embodiments, the spiral pitch of the insulating wire 4 is 0.4-0.5 times the width of the copper flat wire 1 .

[0048] In the above embodiments, the spiral pitch of the insulated wire is 0.4-0.5 times the width of the copper flat wire, ensuring that the insulated wire is tightly wound on the surface of the copper flat wire. This design can effectively increase the physical support and anti-slip ability of the insulated wire, and improve the mechanical stability of the wire under high voltage, vibration and mechanical shock conditions. The tight pitch can reduce the movement or loosening of the insulated wire under high temperature and mechanical stress, and enhance the fatigue resistance and service life of the wire.

[0049] By setting the spiral pitch to 0.4-0.5 times the width of the copper flat wire, a uniform insulation layer is formed between the insulated wires, which helps to maintain electrical isolation between the wires and reduce the risk of electric field concentration and leakage. The tight insulation wire winding design can improve the voltage resistance and insulation performance of the wire under high voltage conditions and reduce the risk of electrical breakdown.

[0050] By properly controlling the spiral pitch, adjacent insulated wires maintain a stable spacing and contact, effectively preventing slippage and wear during external forces or thermal expansion and contraction. The tightly wound structure can provide stable mechanical support and reduce mechanical damage during the use of the wire.

[0051] In some embodiments, the height of the insulating wire 4 is 0.3-0.4 times the thickness of the copper flat wire 1 .

[0052] In the above embodiment, the height of the insulating wire is 0.3-0.4 times the thickness of the copper flat wire, ensuring that the insulating wire provides a stable insulating barrier on the surface of the copper flat wire. The moderate height can effectively increase the insulation distance between the copper flat wires, help to evenly distribute the electric field, and reduce the risk of electrical breakdown caused by local electric field concentration. This design can ensure the electrical insulation performance of the wire under high voltage conditions, and improve the voltage resistance and safety of the wire.

[0053] The height of the insulated wire is designed to be 0.3-0.4 times the thickness of the copper flat wire, providing sufficient physical support and limiting effect. The protruding part of the insulated wire can form a close physical contact between adjacent copper flat wires to prevent the wires from sliding or shifting under vibration or mechanical shock conditions. This moderate height design can also reduce the deformation and wear of the insulated wire under high temperature and high pressure conditions, and enhance the mechanical stability and fatigue resistance of the wire.

[0054] The moderate height design of the insulation wire can reduce the friction and wear between the insulation wire and other components during the operation of the conductor, thus extending the service life of the insulation material. In the long-term operation, this design helps to maintain the mechanical integrity and electrical performance of the insulation wire and prevent insulation failure due to wear or aging.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A UHV combined conductor, characterized in that: include: A copper flat wire (1), an insulating varnish layer (2), a self-adhesive varnish layer (3), an insulating wire (4) and an insulating paper layer (5); the insulating varnish layer (2) is coated on the outer surface of the copper flat wire (1); the surface of the insulating varnish layer (2) is spirally wound with an insulating wire (4) along the length direction of the copper flat wire (1); the self-adhesive varnish layer (3) is filled between two adjacent turns of the insulating wire (4); an odd number of and at least three copper flat wires (1) are spirally transposed; the insulating wires (4) on the surfaces of adjacent copper flat wires (1) along the transposed spiral direction are wound in opposite directions; the insulating wires (4) on the surfaces of the copper flat wires (1) all abut against the surface of the insulating varnish layer (2) of the adjacent copper flat wire (1) on the side where they are located.

2. The UHV combined conductor according to claim 1, characterized in that: The insulating wires (4) on the surfaces of two adjacent copper flat wires (1) abut against each other.

3. The UHV combined conductor according to claim 1, characterized in that: A spiral groove (11) is provided on the surface of the copper flat wire (1), the insulating wire (4) is embedded in the spiral groove (11), and the insulating wire (4) protrudes from the surface of the insulating paint layer (2) on both sides of the spiral groove (11).

4. The UHV combined conductor according to claim 2, characterized in that: The depth of the spiral groove (11) is 1 / 3-1 / 2 of the height of the insulating wire (4).

5. The UHV combined conductor according to claim 1, characterized in that: The spiral pitch of the insulating wire (4) is 2-3 times the width of the insulating wire (4).

6. The UHV combined conductor according to claim 1, characterized in that: The winding angle of the insulated wire (4) is 30-45°.

7. The UHV combined conductor according to claim 1, characterized in that: The spiral pitch of the insulating wire (4) is 0.4-0.5 times the width of the copper flat wire (1).

8. The UHV combined conductor according to claim 1, characterized in that: The height of the insulating wire (4) is 0.3-0.4 times the thickness of the copper flat wire (1).

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