Foil winding lead structure of three-dimensional wound core transformer

Abstract

The utility model belongs to the technical field of distribution transformer manufacturing of a power transmission and transformation system, and particularly relates to a three-dimensional wound core transformer foil type winding lead structure which comprises a second copper foil, lead assemblies are arranged at the two ends of the second copper foil, and the lead assemblies are connected with the second copper foil through bending parts. The lead assemblies, the second copper foil and the bending part are of an integrated structure, one lead assembly is electrically connected with a high-voltage winding assembly, the other lead assembly is electrically connected with a low-voltage winding assembly, and the high-voltage winding assembly is electrically connected with the low-voltage winding assembly. The second copper foil and the two lead assemblies are integrally formed, welding is not needed for connection, oxidation of the second copper foil and the leads caused by welding does not exist, and the electrical performance of the foil type winding is greatly improved. By arranging the high-voltage winding assembly and the low-voltage winding assembly, half current of the original low-voltage winding assembly is distributed to the high-voltage side, local temperature rise of the transformer winding is reduced, and the stability of the transformer is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of manufacturing distribution transformers for power transmission and transformation systems, and particularly relates to a foil winding lead structure for a three-dimensional wound core transformer. Background Art

[0002] The three-dimensional wound core transformer is one of the important electrical equipment in the power transmission and distribution system. In the prior art, there are two structures of the foil winding lead structure of the three-dimensional wound core transformer: one is that the copper foil of the foil winding is welded with the copper busbar, and the upper part of the copper busbar is welded with a soft connection as the lead wire structure, please refer to ( Figure 3 ): The soft connection 2 is welded on the upper part of the copper busbar 3, and the copper busbar 3 is welded on the first copper foil 1. This type of wire-out method has the following problems and defects: There is a weld at the welding point between the copper foil and the copper bar, which needs to be polished smooth after welding and needs to be wrapped with insulation after polishing; the other is a structure in which multiple layers of soft copper strips are stacked together, and the soft connection and the copper foil of the foil winding are directly welded together. The first copper foil 1 is welded with the soft connection 2. Please refer to ( Figure 4 ): This lead method has the problem and disadvantage that the outer soft copper strip and the copper foil are not firmly welded, and the grinding of the weld after welding is time-consuming and laborious.

[0003] The above two three-dimensional wound iron core foil winding lead structures both have the disadvantage of causing oxidation of the copper foil, copper busbar and soft connection surface during the welding process, resulting in a decrease in conductivity, thereby increasing the load loss of the transformer; at the same time, the above two lead structures are difficult to achieve a balance in the resistance of the low-voltage winding, resulting in local heating of the low-voltage winding, affecting the stability of the transformer. Utility Model Content

[0004] The utility model aims to provide a foil winding lead structure of a three-dimensional wound core transformer to solve the above problems.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] A three-dimensional wound core transformer foil winding lead structure comprises a second copper foil, both ends of the second copper foil are provided with lead assemblies, the two lead assemblies are symmetrically arranged, the lead assemblies are connected to the second copper foil through a bending portion, the lead assemblies, the second copper foil and the bending portion are an integral structure, one of the lead assemblies is electrically connected to a high-voltage winding assembly, the other lead assembly is electrically connected to a low-voltage winding assembly, and the high-voltage winding assembly is electrically connected to the low-voltage winding assembly.

[0007] Preferably, the lead assembly includes a plurality of slits opened at the end of the second copper foil, the slits are opened along the length direction of the second copper foil, and the plurality of slits are arranged at equal intervals along the width direction of the second copper foil. Copper foil strips are formed on opposite sides of the slits. The plurality of copper foil strips located at one end of the second copper foil are bent in the same direction to form high-voltage copper bus leads, and the plurality of copper foil strips located at the other end of the second copper foil are bent in the same direction to form low-voltage copper bus leads. The high-voltage copper bus leads and the low-voltage copper bus leads are arranged symmetrically, and the bending portion is formed between the copper foil strips and the second copper foil.

[0008] Preferably, the bending portion includes a fold, and the angle between the fold and the copper foil strip is 45°.

[0009] Preferably, the high-voltage winding assembly includes a high-voltage terminal electrically connected to the high-voltage copper bus lead, and the high-voltage terminal is electrically connected to the low-voltage winding assembly.

[0010] Preferably, the low-voltage winding assembly includes a low-voltage terminal electrically connected to the low-voltage copper bus lead, the low-voltage terminal is electrically connected to the high-voltage terminal, the low-voltage terminal is electrically connected to a connecting piece, and the connecting piece is electrically connected to a switch.

[0011] Preferably, an insulating layer is provided at the connection between the high-voltage copper bus lead and the high-voltage terminal, and at the connection between the low-voltage copper bus lead and the low-voltage terminal.

[0012] Compared with the prior art, the utility model has the following advantages and technical effects:

[0013] The second copper foil and two lead wire assemblies of the utility model are integrally formed, and the connection between the two does not require welding. There is no oxidation of the second copper foil and the lead wires caused during the welding process, so that the electrical performance of the foil winding is greatly improved; at the same time, by arranging the high-voltage winding assembly and the low-voltage winding assembly, half of the current of the original low-voltage winding assembly is distributed to the high-voltage side, which effectively reduces the local temperature rise of the transformer winding and improves the stability of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor:

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2is a schematic diagram of the structure of the lead assembly;

[0017] Figure 3 It is the first connection structure in the prior art;

[0018] Figure 4 This is the second connection structure in the prior art.

[0019] Among them, 1. first copper foil; 2. flexible connection; 3. copper busbar; 4. second copper foil; 5. slit; 6. copper foil strip; 7. high-voltage copper busbar lead; 8. low-voltage copper busbar lead; 9. high-voltage terminal; 10. low-voltage terminal; 11. insulation layer; 12. connecting piece; 13. switch; 14. crease. DETAILED DESCRIPTION

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

[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1 to Figure 2 As shown, the utility model provides a three-dimensional wound core transformer foil winding lead structure, including a second copper foil 4, both ends of the second copper foil 4 are provided with lead assemblies, the two lead assemblies are symmetrically arranged, the lead assembly is connected to the second copper foil 4 through a bending portion, the lead assembly, the second copper foil 4, and the bending portion are an integrated structure, one of the lead assemblies is electrically connected to the high-voltage winding assembly, the other lead assembly is electrically connected to the low-voltage winding assembly, and the high-voltage winding assembly is electrically connected to the low-voltage winding assembly.

[0023] The second copper foil 4 and two lead wire assemblies of the utility model are integrally formed, and the connection between the two does not require welding. There is no oxidation of the second copper foil 4 and the lead wires caused by the welding process, so that the electrical performance of the foil winding is greatly improved; at the same time, by arranging the high-voltage winding assembly and the low-voltage winding assembly, half of the current of the original low-voltage winding assembly is distributed to the high-voltage side, which effectively reduces the local temperature rise of the transformer winding and improves the stability of the transformer.

[0024] A further optimized solution is that the lead assembly includes a plurality of slits 5 opened at the end of the second copper foil 4, the slits 5 are opened along the length direction of the second copper foil 4, and the plurality of slits 5 are arranged at equal intervals along the width direction of the second copper foil 4, and copper foil strips 6 are formed on opposite sides of the slits 5. The plurality of copper foil strips 6 located at one end of the second copper foil 4 are bent in the same direction to form high-voltage copper bus leads 7, and the plurality of copper foil strips 6 located at the other end of the second copper foil 4 are bent in the same direction to form low-voltage copper bus leads 8. The high-voltage copper bus leads 7 and the low-voltage copper bus leads 8 are symmetrically arranged, and a bending portion is formed between the copper foil strips 6 and the second copper foil 4.

[0025] A plurality of slits 5 are formed at the end of the second copper foil 4, and the copper foil strips 6 are bent upward along the roots of the slits 5 to form a bent portion. The bent copper foil strips 6 are stacked together to form a high-voltage copper bus lead 7 and a low-voltage copper bus lead 8.

[0026] According to a further optimized solution, the bending portion includes a fold 14, and the angle between the fold 14 and the copper foil strip 6 is 45°.

[0027] According to a further optimized solution, the high-voltage winding assembly includes a high-voltage terminal 9 electrically connected to the high-voltage copper bus lead 7, and the high-voltage terminal 9 is electrically connected to the low-voltage winding assembly.

[0028] According to a further optimization scheme, the low-voltage winding assembly includes a low-voltage terminal 10 electrically connected to the low-voltage copper bus lead 8, the low-voltage terminal 10 is electrically connected to the high-voltage terminal 9, the low-voltage terminal 10 is electrically connected to a connecting piece 12, and the connecting piece 12 is electrically connected to a switch 13.

[0029] By providing high-voltage copper busbar lead 7, high-voltage terminal 9 and low-voltage copper busbar lead 8, low-voltage terminal 10, half of the current of the low-voltage winding assembly is distributed to the high-voltage side, effectively reducing the local temperature rise of the transformer winding and improving the stability of the transformer.

[0030] According to a further optimized solution, an insulating layer 11 is provided at the connection between the high-voltage copper bus lead 7 and the high-voltage terminal 9 , and at the connection between the low-voltage copper bus lead 8 and the low-voltage terminal 10 .

[0031] The working process of the utility model is as follows:

[0032] A plurality of slits 5 are formed at the end of the second copper foil 4, and the copper foil strips 6 are bent upward along the roots of the slits 5 to form a bent portion, and the bent copper foil strips 6 are stacked together to form a high-voltage copper busbar lead 7 and a low-voltage copper busbar lead 8;

[0033] The high-voltage copper bus lead 7 and the high-voltage terminal 9 are electrically connected, and the low-voltage copper bus lead 8 and the low-voltage terminal 10 are electrically connected, which distributes half of the current of the low-voltage winding assembly to the high-voltage side, effectively reducing the local temperature rise of the transformer winding and improving the stability of the transformer.

[0034] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 invention.

[0035] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A three-dimensional wound core transformer foil winding lead structure, characterized in that: The invention comprises a second copper foil (4), wherein both ends of the second copper foil (4) are provided with lead assemblies, the two lead assemblies are symmetrically arranged, the lead assemblies are connected to the second copper foil (4) via a bending portion, the lead assemblies, the second copper foil (4) and the bending portion are an integral structure, one of the lead assemblies is electrically connected to a high-voltage winding assembly, the other lead assembly is electrically connected to a low-voltage winding assembly, and the high-voltage winding assembly is electrically connected to the low-voltage winding assembly.

2. The three-dimensional wound core transformer foil winding lead structure according to claim 1, characterized in that: The lead assembly comprises a plurality of slits (5) opened at the end of the second copper foil (4), the slits (5) being opened along the length direction of the second copper foil (4), and the plurality of slits (5) being arranged at equal intervals along the width direction of the second copper foil (4), and copper foil strips (6) being formed on opposite sides of the slits (5), and the plurality of copper foil strips (6) located at one end of the second copper foil (4) being bent in the same direction to form a high-voltage copper bus lead (7), and the plurality of copper foil strips (6) located at the other end of the second copper foil (4) being bent in the same direction to form a low-voltage copper bus lead (8), the high-voltage copper bus lead (7) and the low-voltage copper bus lead (8) being arranged symmetrically, and the bending portion being formed between the copper foil strips (6) and the second copper foil (4).

3. The three-dimensional wound core transformer foil winding lead structure according to claim 2, characterized in that: The bent portion comprises a fold (14), and the angle between the fold (14) and the copper foil strip (6) is 45°.

4. The three-dimensional wound core transformer foil winding lead structure according to claim 2, characterized in that: The high-voltage winding assembly comprises a high-voltage terminal (9) electrically connected to the high-voltage copper bus lead (7), and the high-voltage terminal (9) is electrically connected to the low-voltage winding assembly.

5. The three-dimensional wound core transformer foil winding lead structure according to claim 4, characterized in that: The low-voltage winding assembly comprises a low-voltage terminal (10) electrically connected to the low-voltage copper bus lead (8), the low-voltage terminal (10) is electrically connected to the high-voltage terminal (9), the low-voltage terminal (10) is electrically connected to a connecting piece (12), and the connecting piece (12) is electrically connected to a switch (13).

6. The three-dimensional wound core transformer foil winding lead structure according to claim 5, characterized in that: An insulating layer (11) is provided at the connection point between the high-voltage copper busbar lead (7) and the high-voltage terminal (9), and at the connection point between the low-voltage copper busbar lead (8) and the low-voltage terminal (10).

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