Orthogonal double-transposed conductor

Abstract

The invention discloses an orthogonal double-transposed conductor, and relates to the technical field of electricians, the orthogonal double-transposed conductor comprises a conductor body, the conductor body comprises a wire core, an insulating paint film and a self-adhesive film, the insulating paint film is mounted on the outer side of the wire core, the self-adhesive film is mounted on the outer side of the insulating paint film, the wire core is formed by transposing and combining a multi-core small-section wire, and the self-adhesive film is mounted on the outer side of the insulating paint film. A plurality of wire cores are subjected to transposition combination to form a large-section lead, and the front transposition direction and the rear transposition direction are orthogonal. The double-transposed conductor can be used for large-current current-carrying conductors such as windings and leads of electromechanical equipment such as a large power transformer in a strong magnetic field, and the eddy-current loss of the conductor can be effectively reduced due to the fact that the section of the small wire core is very small; the conductor is subjected to transposition in two orthogonal dimensions, so that non-uniform current distribution and circulation and turbulence loss caused by a skin effect and a proximity effect can be effectively reduced, and the risk of local overheating of the conductor is avoided.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering, specifically to an orthogonal double transposed conductor. Background Technology

[0002] The use of transposed conductors in the windings of large power transformers can significantly reduce load losses, reduce the temperature rise of winding hot spots, improve the mechanical strength of the windings, make the structure more compact, and simplify coil processing. Transposed conductors refer to two rows of enameled copper flat wires with a certain number of wires arranged in a wide-face contact, and transposed in the same direction on the top and bottom of the two rows of enameled wires along the narrow face as required, and then wrapped with multiple layers of electrical insulating paper tape.

[0003] Ordinary transposed conductors consist of two rows of enameled copper flat wires arranged in wide contact, with the top and bottom surfaces of the two rows transposed along the narrow sides in the same direction. They are then wrapped with multiple layers of continuous, tight electrical insulating paper tape. Alternatively, paper insulation can be omitted, and a mesh tape woven from transformer oil-resistant polyester or a polyester / glass fiber blend can be used to wrap the transposed cores. When the transformer capacity is extremely large and the voltage is very low, the winding current is very high. Due to the limitation on the number of conductor cores, the size of the single-core flat wire cannot be too small. Since the size of the single-core flat wire affects its eddy current loss, a larger size, although reducing DC resistance loss, leads to a sharp increase in eddy current loss. To minimize this impact, this invention develops a novel double-transposed conductor structure.

[0004] In view of this, it is necessary to develop an orthogonal double transposed conductor, which can effectively reduce the eddy current loss of the conductor. Summary of the Invention

[0005] The purpose of this invention is to provide an orthogonal double transposed conductor to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an orthogonal double transposed conductor, comprising: a conductor body, the conductor body comprising a conductor core, an insulating varnish film, and a self-adhesive film, the insulating varnish film being installed on the outside of the conductor core, the self-adhesive film being installed on the outside of the insulating varnish film, the conductor core being formed by transposing and combining multiple conductor cores with small cross-sections, and multiple conductor cores being transposed and combined again to form a conductor with a large cross-section, wherein the directions of the two transpositions are orthogonal, and the insulating varnish film and the self-adhesive film are bonded to the conductor core by heating to form an integral structure.

[0007] Preferably, a shielding wire is provided between the conductor bodies.

[0008] Preferably, an insulating layer is provided on the outer side of the conductor body. The insulating layer is a modified polyesterimide varnish with a thickness of 0.02 mm and a breakdown voltage of 63 kV / mm.

[0009] Preferably, an elastic buffer layer is provided on the outer side of the insulating layer. The elastic buffer layer is made of silicone rubber and has a thickness of 0.2 mm.

[0010] Preferably, an outer insulating sleeve is provided on the outside of the elastic buffer layer. The outer insulating sleeve is a polyester and glass fiber mixed mesh belt with a thickness of 0.3 mm.

[0011] Preferably, the outer insulating sleeve has a plurality of tensile ribs inside, which are neatly arranged inside the outer insulating sleeve and are made of nylon ribs.

[0012] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the transposed conductor is formed by combining multiple small-section conductors in different positions to create a core. The surface of the core is then bonded together with an insulating varnish and a self-adhesive film by heating to form the conductor body. Multiple conductor bodies are then combined in different positions to create a large-section conductor. The directions of the two transpositions are orthogonal. This double-transposed conductor can be used for high-current-carrying conductors such as windings and leads in large power transformers and other electromechanical equipment located in strong magnetic fields. Because the cross-section of the small core is very small, the eddy current loss of the conductor can be effectively reduced. Since the conductor is transposed in two orthogonal dimensions, the uneven current distribution caused by the skin effect and proximity effect, as well as the circulating and turbulent losses, can be effectively reduced, avoiding the risk of local overheating of the conductor. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the wire core structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle.

[0014] In the diagram: 1. Conductor body; 2. Wire core; 3. Insulating varnish film; 4. Self-adhesive film; 5. Shielding wire; 6. Insulation layer; 7. Elastic buffer layer; 8. External insulating sleeve; 9. Tensile reinforcement. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0018] Example 1, please refer to Figure 1 and Figure 2 A type of orthogonal double transpose conductor; It includes: a conductor body 1, which includes a conductor core 2, an insulating varnish film 3, and a self-adhesive film 4. The insulating varnish film 3 is installed on the outside of the conductor core 2, and the self-adhesive film 4 is installed on the outside of the insulating varnish film 3. The conductor core 2 is formed by transposing and combining multiple conductors with small cross-sections. After transposing and combining multiple conductor cores 2, they become a conductor with a large cross-section. The directions of the two transpositions are orthogonal. The insulating varnish film 3 and the self-adhesive film 4 are bonded to the conductor core 2 by heating to form an integral structure. A shielding wire 5 is provided between the conductor bodies 1. The transposed conductor consists of multiple small-section conductors transposed and combined to form core 2. The surface of core 2 is bonded together with insulating varnish 3 and self-adhesive film 4 by heating to form conductor body 1. Multiple conductor bodies 1 are then transposed and combined to form a large-section conductor. The transposition directions of the two transpositions are orthogonal. Insulating varnish 3 and self-adhesive film 4 form double insulation to prevent short circuit of core 2. If there are two sets of this conductor inside the transposed conductor, it is a double transposed combined conductor. By adding a shielding wire 5 in the middle of the double transposed combined conductor, the electromagnetic environment inside the transposed conductor can be optimized, additional losses can be reduced, and the insulation system can be protected. This double transposed conductor can be used for high-current-carrying conductors such as windings and leads of large power transformers and other electromechanical equipment located in strong magnetic fields. Because the cross-section of the small core 2 is very small, the eddy current loss of the conductor can be effectively reduced. Because the conductor is transposed in two orthogonal dimensions, the uneven current distribution caused by skin effect and proximity effect, as well as circulating current and turbulent current losses, can be effectively reduced, avoiding the risk of local overheating of the conductor.

[0019] Example 2, please refer to Figure 3 and Figure 4 A type of orthogonal double transpose conductor; An insulation layer 6 is provided on the outside of the conductor body 1. The insulation layer 6 is a modified polyesterimide varnish with a thickness of 0.02 mm and a breakdown voltage of 63 kV / mm. An elastic buffer layer 7 is provided on the outside of the insulation layer 6. The elastic buffer layer 7 is made of silicone rubber with a thickness of 0.2 mm. The insulation layer 6 can prevent magnetic leakage inside the conductor, and the elastic buffer layer 7 can absorb the stress on the transposed conductor. When the conductor is in use, it will expand and contract with heat, which will lead to problems such as insulation cracking and core 2 displacement. By setting the elastic buffer layer 7, the stress generated by thermal expansion and contraction can be absorbed, thus avoiding the occurrence of this problem.

[0020] Example 3, please refer to Figure 4 A type of orthogonal double transpose conductor; An outer insulating sleeve 8 is provided on the outside of the elastic buffer layer 7. The outer insulating sleeve 8 is a polyester and glass fiber mixed mesh belt with a thickness of 0.3mm. Several tensile ribs 9 are provided inside the outer insulating sleeve 8. The tensile ribs 9 are neatly arranged inside the outer insulating sleeve 8 and are made of nylon ribs. The outer insulating sleeve 8 serves as an insulating protection. By adding tensile ribs 9 inside, the tensile strength of the transposed conductor can be improved. The tensile ribs 9 have a circular cross-section with a diameter of 0.7 mm and are evenly distributed inside the outer insulating sleeve 8. Their tensile strength is greater than 800 N.

[0021] The working principle is as follows: First, the transposed conductor is composed of multi-core, small-section conductors that are transposed and combined to form conductor core 2. Multiple such conductor cores 2 are then transposed and combined to form a large-section conductor. The directions of the two transpositions are orthogonal. The conductor surface has an insulating varnish film 3 and a self-adhesive film 4, which can be bonded together firmly after heating. The outer layer of the entire conductor is paper-insulated or wire-insulated, or other insulating materials. The double-transposed conductor of this invention can be used for high-current-carrying conductors such as windings and leads in large power transformers and other electromechanical equipment located in strong magnetic fields.

[0022] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An orthogonal double transposed conductor, characterized in that, include: The conductor body (1) includes a conductor core (2), an insulating varnish film (3), and a self-adhesive film (4). The insulating varnish film (3) is installed on the outside of the conductor core (2), and the self-adhesive film (4) is installed on the outside of the insulating varnish film (3). The conductor core (2) is formed by transposing and combining multiple conductors with small cross-sections. Multiple conductor cores (2) are then transposed and combined to form a conductor with a large cross-section. The directions of the two transpositions are orthogonal. The insulating varnish film (3) and the self-adhesive film (4) are bonded to the conductor core (2) by heating to form an integral structure.

2. The orthogonal double transposed conductor according to claim 1, characterized in that: A shielding wire (5) is provided between the conductor bodies (1).

3. The orthogonal double transposed conductor according to claim 2, characterized in that: An insulating layer (6) is provided on the outside of the conductor body (1). The insulating layer (6) is a modified polyesterimide varnish with a thickness of 0.02 mm and a breakdown voltage of 63 kV / mm.

4. The orthogonal double transposed conductor according to claim 3, characterized in that: An elastic buffer layer (7) is provided on the outside of the insulating layer (6). The elastic buffer layer (7) is made of silicone rubber and has a thickness of 0.2 mm.

5. The orthogonal double transposed conductor according to claim 4, characterized in that: An outer insulating sleeve (8) is provided on the outside of the elastic buffer layer (7). The outer insulating sleeve (8) is a polyester and glass fiber mixed mesh belt with a thickness of 0.3 mm.

6. The orthogonal double transposed conductor according to claim 5, characterized in that: The outer insulating sleeve (8) is provided with a number of tensile ribs (9), which are neatly arranged inside the outer insulating sleeve (8). The tensile ribs (9) are nylon ribs.

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