Complete transposition method of two three-combination wires and transformer winding

Abstract

The invention belongs to the technical field of transformers, and particularly relates to a complete transposition method of two three-combination wires and a transformer winding, and the complete transposition method of the two three-combination wires is characterized in that special transposition is respectively carried out on an inter-section surface position at a one-third section and an inter-section surface position at a two-thirds section of a bus cake number; according to the transposition method of the other sections, cross transposition is carried out according to a standard cross transposition mode, after transposition is carried out according to the method, complete transposition can be achieved, once the transposition on the continuous coil reaches complete transposition, the number of occupied space positions of the six wires on the whole coil is the same, and the number of occupied space positions of the six wires on the whole coil is the same as the number of occupied space positions of the six wires on the whole coil. The same number of spatial positions means that the lengths, the induced voltages, the resistances and the passing currents of the six wires are the same, and the circulating current loss is completely eliminated due to the fact that no voltage difference exists among the six wires, so that the load capacity of the coil is improved, and the additional loss of the coil is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a complete transposition method of two three-combination conductors and a transformer winding. Background Art

[0002] In order to ensure that the current flowing through the coil of large and medium-sized transformers matches the capacity, it is obvious that as the capacity of the transformer increases, the current flowing through each turn of the coil wire also increases. In order to avoid overheating of the coil wire, the total cross-sectional area of ​​each turn of the coil wire must also be increased. In the actual application of transformers, the methods of increasing the total cross-sectional area of ​​each turn of the wire are: (1) increasing the cross-sectional area of ​​a single wire; (2) increasing the number of parallel windings per turn of the wire; (3) increasing the cross-sectional area of ​​a single wire and the number of parallel windings at the same time.

[0003] Among them, for method (1), increasing the cross-sectional area of ​​a single conductor will increase the eddy current loss (or additional loss); and for method (2), increasing the number of parallel windings per turn of the conductor will increase the transposition loss (or circulating current loss) when the transposition is not complete. In order to reduce the eddy current loss and transposition loss of the coil, currently more common conductors, combined conductors, or transposition conductors with multiple small conductors wound in parallel are used.

[0004] In addition to the transposed conductors (transposed conductors are conductors that can achieve complete transposition) with multiple small conductors wound in parallel, which can eliminate transposition loss (or circulating current loss), ordinary conductors and combined conductors with multiple (more than two) small conductors wound in parallel cannot achieve complete transposition if they are still cross-transposed according to the current traditional standard. Similarly, for each turn of the conductor, a continuous coil wound by two or three combined conductors cannot achieve complete transposition if they are still cross-transposed according to the current traditional standard. Failure to achieve complete transposition means that transposition loss (or circulating current loss) cannot be eliminated. Summary of the invention

[0005] The present invention aims to provide a method for completely transposing two three-combination conductors and a transformer winding, so that through the method for completely transposing two three-combination conductors, when the number of parallel windings of each turn of the continuous coil is two three-combination conductors, complete transposition can be achieved, thereby eliminating transposition loss (or circulating current loss) to achieve the purpose of reducing costs and increasing efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: A method for completely transposing two three-combination conductors is provided, comprising: The six-section continuous coil is wound by winding two three-combination conductors in parallel. Each of the two three-combination conductors includes three single conductors, and the six single conductors of each turn of the coil in each continuous coil are arranged in the same order; the six-section continuous coils are respectively a first section continuous coil, a second section continuous coil, a third section continuous coil, a fourth section continuous coil, a fifth section continuous coil, and a sixth section continuous coil; The outlet end of the first continuous coil and the inlet end of the second continuous coil, the outlet end of the third continuous coil and the inlet end of the fourth continuous coil, and the outlet end of the fifth continuous coil and the inlet end of the sixth continuous coil are respectively connected in a standard cross-transposition manner, wherein the standard cross-transposition manner is to sequentially transpose the two three-combination wires in the previous continuous coil to the two three-combination wires in the next continuous coil; The outlet end of the second continuous coil and the inlet end of the third continuous coil, and the outlet end of the fourth continuous coil and the inlet end of the fifth continuous coil are respectively connected in a 1-2-1-2 cross-transposition manner, wherein the 1-2-1-2 cross-transposition manner is to connect the first single wire of the first three-combination wire in the previous continuous coil to the third single wire of the second three-combination wire in the next continuous coil, and to connect the second single wire of the first three-combination wire in the previous continuous coil to the third single wire of the second three-combination wire in the next continuous coil. The wire and the third single wire are sequentially transposed and connected to the first single wire and the second single wire of the second three-combination wire of the next continuous coil, the first single wire of the second three-combination wire in the previous continuous coil is transposed and connected to the third single wire of the first three-combination wire of the next continuous coil, and the second single wire and the third single wire of the second three-combination wire in the previous continuous coil are sequentially transposed and connected to the first single wire and the second single wire of the first three-combination wire of the next continuous coil.

[0007] Preferably, the three-combination conductor comprises three bare conductors, each bare conductor is firstly wrapped with an inner insulating layer to form three separate conductors, and then the three separate conductors are combined together to be wrapped with an outer insulating layer to form the three-combination conductor.

[0008] Preferably, the transposition wiring position of the 1-2-1-2 cross-transposition method is located on the surface side of the coil outer diameter.

[0009] The present invention also provides a transformer winding, which is wired by using the complete transposition method of two three-combination conductors as described in any of the above items.

[0010] Compared with the prior art, the beneficial effect of the present invention is that after the two three-combination wires are completely transposed by the complete transposition method, after the transformer winding is wound with 6 wires, the number of spatial positions occupied by the 6 wires is exactly the same, that is, 6 wires are distributed at each position from the outer diameter side of the entire winding to the inside, so the effect of complete transposition is achieved. After complete transposition, there is no voltage difference between the 6 wires of the winding, and no circulating current loss (or transposition loss) will be generated. This is because once the transposition of the two three-combination wires on the continuous coil reaches complete transposition, it means that the 6 wires occupy the same number of spatial positions in the spatial position of the entire coil. The same number of spatial positions means that the 6 wires have the same length, the same induced voltage, the same resistance, and the same current (or the same load capacity) passing through. Because there is no voltage difference between the 6 wires, the circulating current loss (or transposition loss) is completely eliminated, which not only improves the load capacity of the coil, but also reduces the additional loss of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 The figure is a schematic diagram of coil wiring of an embodiment of a method for completely transposing two three-combination conductors of the present invention.

[0012] Figure 2 - (a) Figure 2 - (b) and Figure 2 - (c) are schematic diagrams of three different combinations of six wires used to wind a coil.

[0013] Figure 3 This is a schematic diagram of coil wiring in the control example, which all adopts the standard cross-transposition method.

[0014] In the figure, each symbol indicates: A first continuous coil 100, a first single wire 101, a second single wire 102, a third single wire 103, a first three-combination wire 104, a second three-combination wire 105, a first coil turn 106, a second coil turn 107, a second continuous coil 200, a third continuous coil 300, a fourth continuous coil 400, a fifth continuous coil 500, and a sixth continuous coil 600; Bare conductor 700, turn insulation 701, inner insulation 702, outer insulation 703; 1-2-1-2 cross-transposition method A, standard cross-transposition method B; Position I, position II, position III, position IV, position V, position VI. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in 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.

[0016] In one embodiment, a method for completely transposing two three-combination conductors is provided, such as Figure 1 As shown, the complete transposition method of the two three-combination conductors is achieved by: Two three-combination wires are wound in parallel to form six continuous coils. These six continuous coils are all used to wind around the iron core of the transformer. Figure 1 In the figure, the six continuous coils are respectively the first continuous coil 100, the second continuous coil 200, the third continuous coil 300, the fourth continuous coil 400, the fifth continuous coil 500, and the sixth continuous coil 600. Each of the six continuous coils has two turns (two circles). In other embodiments, other numbers of turns can also be wound, with the upper turn located on the surface of the outer diameter side of the coil and the lower turn located on the bottom of the inner diameter side of the coil.

[0017] When the coil is wound on the core of the transformer, it is preferred that the number of segments of the continuous coil wound in parallel by two three-combination conductors is a multiple of 6, such as 6 segments, 12 segments or 18 segments.

[0018] Each of the two three-combination conductors includes three single conductors, and the six single conductors of each turn of each continuous coil are arranged in the same order. Figure 1 Taking the first continuous coil 100 in the example, it includes a first coil 106 and a second coil 107. The first coil 106 is located on the outer diameter side, and the second coil 107 is located on the inner diameter side. The 6 single wires in the first coil 106 and the 6 single wires in the second coil 107 are numbered in the same order, which is "1-2-3-4-5-6". Taking the first coil 106 as an example, it includes two three-combination wires, namely the first three-combination wire 104 and the second three-combination wire 105; taking the first three-combination wire 104 as an example, it includes 3 single wires, namely the first single wire 101, the second single wire 102 and the third single wire 103.

[0019] Since the first section continuous coil 100 is a continuous coil, the starting ends of the six single wires in the first turn coil 106 are the electrical input ends of the entire winding, and the ends are electrically connected to the six single wires in the second turn coil 107 in sequence according to the order of arrangement. For example, the end of the first single wire 101 is electrically connected to the starting end of the single wire in the second turn coil 107 with the order of arrangement being "1".

[0020] like Figure 1 As shown, the outgoing wire end of the first continuous coil 100 and the incoming wire end of the second continuous coil 200, the outgoing wire end of the third continuous coil 300 and the incoming wire end of the fourth continuous coil 400, and the outgoing wire end of the fifth continuous coil 500 and the incoming wire end of the sixth continuous coil 600 are respectively connected by the standard cross-transposition method B. The standard cross-transposition method B is to sequentially transpose and connect each single wire of the two three-combination wires in the previous continuous coil to each single wire of the two three-combination wires in the next continuous coil.

[0021] Taking the standard cross-transposition method B as an example, the outgoing end of the first continuous coil 100 and the incoming end of the second continuous coil 200 are transposed and connected. The outgoing end of the first three-combination conductor 104 in the first continuous coil 100 is the end of the three single conductors in the second coil 107 with the numbering sequence of "1, 2, 3", and the outgoing end of the second three-combination conductor 105 in the first continuous coil 100 is the end of the three single conductors in the second coil 107 with the numbering sequence of "3, 4, 5". After the first continuous coil 100 and the second continuous coil 200 are transposed and connected using the standard cross-transposition method B, the numbering sequence of the two three-combination conductors in the second continuous coil 200 is transposed, that is, the numbering sequence of the six single conductors in the two coils of the second continuous coil 200 is changed to "4, 5, 6, 1, 2, 3".

[0022] The outgoing wire end of the second continuous coil 200 and the incoming wire end of the third continuous coil 300, as well as the outgoing wire end of the fourth continuous coil 400 and the incoming wire end of the fifth continuous coil 500 are connected by 1-2-1-2 cross-transposition mode A. The 1-2-1-2 cross-transposition mode A is to connect the first single wire of the first three-combination wire in the previous continuous coil to the third single wire of the second three-combination wire in the next continuous coil, and to connect the second single wire of the first three-combination wire in the previous continuous coil to the third single wire of the second three-combination wire in the next continuous coil. The single wire and the third single wire are sequentially transposed and connected to the first single wire and the second single wire of the second three-combination wire of the next continuous coil, the first single wire of the second three-combination wire in the previous continuous coil is transposed and connected to the third single wire of the first three-combination wire of the next continuous coil, and the second single wire and the third single wire of the second three-combination wire in the previous continuous coil are sequentially transposed and connected to the first single wire and the second single wire of the first three-combination wire of the next continuous coil.

[0023] Taking the 1-2-1-2 cross-transposition method A as an example, the outgoing end of the first three-combination wire in the second continuous coil 200 is the end of the three single wires numbered in the order of "4, 5, 6" in the first turn coil (outer diameter side), and the outgoing end of the second three-combination wire in the second continuous coil 200 is the end of the three single wires numbered in the order of "1, 2, 3" in the first turn coil (outer diameter side). When the second continuous coil 200 and the third continuous coil 300 are transposed and wired in the 1-2-1-2 cross-transposition method A: The outlet end of the first single wire (the single wire with the numbering sequence of "4") of the first three-combination wire in the second-section continuous coil 200 is connected to the third single wire (the single wire with the numbering sequence of "4" in the first turn of the third-section continuous coil 300) of the second three-combination wire in the third-section continuous coil 300; the outlet ends of the second single wire and the third single wire (the two single wires with the numbering sequence of "5, 6") of the first three-combination wire in the second-section continuous coil 200 are connected to the first and second single wires (the two single wires with the numbering sequence of "5, 6" in the first turn of the third-section continuous coil 300) of the second three-combination wire in the third-section continuous coil 300; The outlet end of the first single wire (the single wire with the numbering sequence of "1") of the second three-combination wire in the second-segment continuous coil 200 is connected to the third single wire (the single wire with the numbering sequence of "1" in the first turn of the third-segment continuous coil 300) of the first three-combination wire; the outlet ends of the second single wire and the third single wire (the two single wires with the numbering sequence of "2, 3") of the second three-combination wire in the second-segment continuous coil 200 are connected to the first and second single wires (the two single wires with the numbering sequence of "2, 3" in the first turn of the third-segment continuous coil 300) of the first three-combination wire in the third-segment continuous coil 300.

[0024] After the second section continuous coil 200 and the third section continuous coil 300 are transposed and wired using the 1-2-1-2 cross-transposition method A, the numbering sequence of the two three-combination wires in the third section continuous coil 300 is cross-transposed, that is, the numbering sequence of the six single wires in each of the two turns of the third section continuous coil 300 is changed to "2, 3, 1, 5, 6, 4".

[0025] After all the transpositions are completed, the numbering sequence of the six single wires in the two turns of the first section continuous coil 100 is "1, 2, 3, 4, 5, 6", the numbering sequence of the six single wires in the two turns of the second section continuous coil 200 is changed to "4, 5, 6, 1, 2, 3", the numbering sequence of the six single wires in the two turns of the third section continuous coil 300 is changed to "2, 3, 1, 5, 6, 4", the numbering sequence of the six single wires in the two turns of the fourth section continuous coil 400 is changed to "5, 6, 4, 2, 3, 1", the numbering sequence of the six single wires in the two turns of the fifth section continuous coil 500 is changed to "3, 1, 2, 5, 4, 5", and the numbering sequence of the six single wires in the two turns of the sixth section continuous coil 600 is changed to "6, 4, 5, 3, 1, 2".

[0026] according to Figure 1It can be seen that after the complete transposition method of the two three-combination conductors is used for transposition, after the transformer winding is wound with 6 conductors, the number of spatial positions occupied by the 6 conductors is exactly the same, that is, 6 conductors are distributed at each position (position I, position II, position III, position IV, position V, position VI) from the outer diameter side of the entire winding, so the effect of complete transposition is achieved. After complete transposition, there is no voltage difference between the 6 conductors of the wound winding, and no circulating current loss (or transposition loss) will be generated.

[0027] This is because once the transposition of the two three-combination wires on the continuous coil is completely transposed, it means that the six wires occupy the same number of spatial positions in the entire coil. The same number of spatial positions means that the six wires have the same length, the same induced voltage, the same resistance, and the same current (or the same load capacity). Since there is no voltage difference between the six wires, the circulating current loss (or transposition loss) is completely eliminated, which not only improves the load capacity of the coil, but also reduces the additional loss of the coil.

[0028] It can be seen from the above embodiments that the complete transposition method of the two three-combination conductors is to perform a special transposition of the 1-2-1-2 cross transposition method A at the segment plane position at one-third of the total number of segments (or the number of total number of total segments) and the segment plane position at two-thirds of the total number of segments, and the transposition method between the remaining segments is cross transposition according to the standard cross transposition method B. After transposition is performed in this way, complete transposition can be achieved. In this embodiment, the meaning of "1-2-1-2" in the 1-2-1-2 cross transposition method A is: "1" represents a transposition method with 1 wire as 1 group; "2" represents a transposition method with 2 wires as 1 group.

[0029] In the complete transposition method of the two three-combination conductors, the process flow of the 1-2-1-2 cross transposition method A is different from that of the standard cross transposition method B. The standard cross transposition method B does not need to cut the two three-combination conductors during transposition to complete the transposition. In the special transposition method of the two 1-2-1-2 cross transposition methods A, each transposition requires cutting the two three-combination conductors first (that is, 6 conductors need to be cut for each special transposition, and 12 conductors are cut for two special transpositions in total), stripping the turn insulation, and then welding according to the one-to-one corresponding transposition positions shown in the special transposition, processing the welding points according to the process requirements, and then re-wrapping the turn insulation to complete the special transposition.

[0030] Due to the two special transpositions in this method (1-2-1-2 cross transposition method A), there is a process flow of first cutting, then welding, and then wrapping insulation when completing the transposition. Therefore, if the special transposition is set at the bottom position (inner diameter side), once an error occurs in the manufacturing process, the operation space is blocked and the error cannot be corrected because the special transposition is set on the inner diameter side.

[0031] Therefore, the two special transpositions in this method are both set at the surface position (outer diameter side). Once an error occurs in the manufacturing process, since the special transposition is set on the outer diameter side, the operating space is not blocked and it is easy to correct the error.

[0032] In practical applications of this method, as long as the total number of segments of the continuous coil is an integer multiple of 6, for two three-combination conductors, complete transposition can be achieved according to the transposition method described in this patent.

[0033] In practical applications of this method, if the total number of segments of the continuous coil is not an integer multiple of 6, complete transposition cannot be achieved for the two three-combination conductors. However, even if complete transposition cannot be achieved, the incomplete transposition rate is much lower than the incomplete transposition rate obtained when the traditional cross transposition method is used.

[0034] Based on the above embodiments, it can be seen that in this method, the winding structure is simple and clear, which is convenient for coil design and processing. The two special transpositions are both set on the surface position (outer diameter side) to facilitate error correction. When the complete transposition is achieved, the two three-combination wires need to be cut the least number of times and the number of welding times is the lowest.

[0035] Furthermore, in another embodiment, in the method for completely transposing the two three-combination conductors, the three-combination conductor includes three bare conductors, each bare conductor is first wrapped with an inner insulation layer to form three separate conductors, and then the three separate conductors are combined together to be wrapped with an outer insulation layer to form a three-combination conductor.

[0036] Combination Figure 2 As shown, in the actual application of transformer coils, when six wires are used to wind the coil, the six wires can be composed of six ordinary wires (such as Figure 2 - (a)), three two-combination conductors (such as Figure 2 - (b)), two three-combination conductors (such as Figure 2 -(c)).

[0037] Among them, Figure 2 As shown in (a), when 6 ordinary wires are used, since the turn insulation 701 of each bare wire 700 is independently insulated, the total height dimension H1 of the 6 ordinary wires is large, resulting in a large coil volume, a low coil filling rate, a large amount of material consumption, and a high cost.

[0038] Next, let’s look at Figure 2 - (b) the wire shown, Figure 2 - In (b), the three two-combination conductors are each first wrapped with inner insulation 702, and then the two conductors are combined together to wrap the outer insulation 703. The turn insulation of the two combined conductors = inner insulation + outer insulation, resulting in the total height dimension H2 of the three two-combination conductors being less than H1, and the coil volume being less than Figure 2- (a) The coil filling rate is > Figure 2 - (a), material consumption < Figure 2 - (a), cost < Figure 2 -(a).

[0039] Finally, let's look at Figure 2 - The conductors shown in (c) are two three-combination conductors. Since each bare conductor 700 is also first wrapped with inner insulation 702, and then the three conductors are combined together to wrap the outer insulation 703, the turn insulation of the three-combination conductor is also = inner insulation + outer insulation, but the total height dimension of the two three-combination conductors H3<H2 Figure 2 - (b) < Figure 2 - (a), coil filling rate > Figure 2 - (b)> Figure 2 - (a), material consumption < Figure 2 - (b) < Figure 2 - (a), cost < Figure 2 - (b) < Figure 2 -(a).

[0040] As shown in the above comparative analysis, in the combination of 6 wires, Figure 2 - The combination of two three-combination wires in (c) can minimize the total height of the wire, minimize the coil volume, maximize the coil filling rate, minimize the material usage, and minimize the cost. It is the best combination. Therefore, this method adopts Figure 2 - The combination of two three-combination wires in (c).

[0041] Due to the adoption Figure 2 - The two three-combination conductors in (c) are the best combination. In addition, the transposition method used above can achieve complete transposition, so this method is of great significance to the cost reduction and efficiency improvement of the entire transformer.

[0042] As a comparison, combined Figure 3 As shown, if the two three-combination conductors are all transposed by the standard cross transposition method between each section, it is impossible to achieve complete transposition. For the convenience of analysis, the total number of sections (D) of the continuous coil is 6 sections, and the number of turns per section is 2 turns. The winding diagram is as follows Figure 3 As shown, in Figure 3 In the embodiment, the six continuous coils are respectively a first continuous coil 100, a second continuous coil 200, a third continuous coil 300, a fourth continuous coil 400, a fifth continuous coil 500, and a sixth continuous coil 600. Figure 3 ​It can be seen that if all the sections of two three-combination conductors are transposed according to the standard cross-transposition method, the number of spatial positions occupied by the six conductors is different, and complete transposition is not achieved. Because complete transposition is not achieved, there is still a voltage difference between the six conductors, and the existence of the voltage difference will cause circulating current loss (or transposition loss).

[0043] In one embodiment, a transformer winding is provided, and the transformer winding is wired by using the complete transposition method of two three-combination conductors in the previous embodiment. Since the transformer uses the transposition of two three-combination conductors on the continuous coil to achieve complete transposition, it means that the six conductors occupy the same number of spatial positions in the spatial position of the entire coil. The same number of spatial positions means that the six conductors have the same length, the same induced voltage, the same resistance, and the same current (or the same load capacity). Since there is no voltage difference between the six conductors, the circulating current loss (or transposition loss) is completely eliminated, which not only improves the load capacity of the coil, but also reduces the additional loss of the coil.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for completely transposing two three-combination conductors, characterized in that: include: The six-section continuous coil is wound by winding two three-combination conductors in parallel. Each of the two three-combination conductors includes three single conductors, and the six single conductors of each turn of the coil in each continuous coil are arranged in the same order; the six-section continuous coils are respectively a first section continuous coil, a second section continuous coil, a third section continuous coil, a fourth section continuous coil, a fifth section continuous coil, and a sixth section continuous coil; The outlet end of the first continuous coil and the inlet end of the second continuous coil, the outlet end of the third continuous coil and the inlet end of the fourth continuous coil, and the outlet end of the fifth continuous coil and the inlet end of the sixth continuous coil are respectively connected in a standard cross-transposition manner, wherein the standard cross-transposition manner is to sequentially transpose the two three-combination wires in the previous continuous coil to the two three-combination wires in the next continuous coil; The outlet end of the second continuous coil and the inlet end of the third continuous coil, and the outlet end of the fourth continuous coil and the inlet end of the fifth continuous coil are respectively connected in a 1-2-1-2 cross-transposition manner, wherein the 1-2-1-2 cross-transposition manner is to connect the first single wire of the first three-combination wire in the previous continuous coil to the third single wire of the second three-combination wire in the next continuous coil, and to connect the second single wire of the first three-combination wire in the previous continuous coil to the third single wire of the second three-combination wire in the next continuous coil. The wire and the third single wire are sequentially transposed and connected to the first single wire and the second single wire of the second three-combination wire of the next continuous coil, the first single wire of the second three-combination wire in the previous continuous coil is transposed and connected to the third single wire of the first three-combination wire of the next continuous coil, and the second single wire and the third single wire of the second three-combination wire in the previous continuous coil are sequentially transposed and connected to the first single wire and the second single wire of the first three-combination wire of the next continuous coil.

2. The method for completely transposing two three-combination conductors according to claim 1, characterized in that: The three-combination conductor comprises three bare conductors, each bare conductor is firstly wrapped with an inner insulating layer to form three separate conductors, and then the three separate conductors are combined together to be wrapped with an outer insulating layer to form the three-combination conductor.

3. The method for completely transposing two three-combination conductors according to claim 1, characterized in that: The transposition wiring position of the 1-2-1-2 cross transposition method is located on the surface of the coil outer diameter side.

4. A transformer winding, characterized in that: The transformer winding is wired by using the complete transposition method of two three-combination conductors as described in any one of claims 1-3.

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