Completely transposed transformer winding with four two-combination leads
By adopting four two-combination wires and combining with specific cross-transfer methods, the problem of complete transposition in large and medium-sized transformers is solved, efficient current transmission and loss reduction, achieving the purpose of cost reduction and efficiency improvement.
Patent Information
- Application Number
- CN202422178576.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-05
AI Technical Summary
The prior art is difficult to achieve complete transposition in large and medium-sized transformers, resulting in an increase in eddy current loss and transposition loss, affecting efficiency and cost.
Four two-combination wires are wound together, and the eight-section continuous coil is completely swept through a specific cross-transfer method to eliminate circulating current losses.
Complete transposition is achieved, eliminating circulating current losses, improving the load capacity of the coil and reducing additional losses while reducing production costs.
Smart Images
Figure CN223023025U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of transformers, and particularly relates to a fully transposed transformer winding with four two-combined conductors. Background Art
[0002] To ensure that the current flowing through the coil of a medium and large-sized transformer matches the capacity, obviously, as the capacity of the transformer increases, the current flowing through each turn of the conductor in the coil also increases. To avoid overheating of the coil conductors, the total current-carrying cross-sectional area of each turn of the conductor also needs to increase at this time. In the actual application of transformers, the methods to increase the total current-carrying cross-sectional area of each turn of the conductor are: (1) increasing the current-carrying cross-sectional area of a single conductor; (2) increasing the number of parallel conductors in each turn; (3) simultaneously increasing the current-carrying cross-sectional area of a single conductor and the number of parallel conductors.
[0003] Among them, for the first method, increasing the current-carrying cross-sectional area of a single conductor will increase the eddy current loss (or additional loss); for the second method, increasing the number of parallel conductors in each turn will increase the transposition loss (or circulating current loss) when the transposition is not complete. To reduce the eddy current loss and transposition loss of the coil, currently, more common conductors, combined conductors, or transposed conductors with multiple small conductors in parallel are used.
[0004] Except that the transposed conductor with multiple small conductors in parallel (the transposed conductor can achieve complete transposition) can eliminate the transposition loss (or circulating current loss), for ordinary conductors and combined conductors with multiple (more than two) small conductors in parallel, if they are transposed according to the current traditional standard cross transposition, they cannot achieve complete transposition. Similarly, for each turn of the conductor, for a continuous coil wound with four two-combined conductors, if it is transposed according to the current traditional standard cross transposition, it also cannot achieve complete transposition. And the inability to achieve complete transposition means that the transposition loss (or circulating current loss) cannot be eliminated. Summary of the Utility Model
[0005] The utility model aims to provide a fully transposed transformer winding with four two-combined conductors, so that when the number of parallel conductors in each turn of the continuous coil is wound with four two-combined conductors, complete transposition can be achieved, thereby eliminating the transposition loss (or circulating current loss), so as to achieve the purpose of cost reduction and efficiency improvement.
[0006] To achieve the above purpose, the utility model adopts the following technical solutions:
[0007] Provide a fully transposed transformer winding with four two-combined conductors, including:
[0008] Eight-section continuous coils are wound in a way that four two-combined conductors are wound in parallel. In the four two-combined conductors, each two-combined conductor includes 2 single conductors, and the row numbers of the 8 single conductors in each turn of each continuous coil are in the same order; the eight-section continuous coils are respectively the first-section continuous coil, the second-section continuous coil, the third-section continuous coil, the fourth-section continuous coil, the fifth-section continuous coil, the sixth-section continuous coil, the seventh-section continuous coil, and the eighth-section continuous coil;
[0009] Between the outgoing end of the first-section continuous coil and the incoming end of the second-section continuous coil, between the outgoing end of the third-section continuous coil and the incoming end of the fourth-section continuous coil, between the outgoing end of the fifth-section continuous coil and the incoming end of the sixth-section continuous coil, and between the outgoing end of the seventh-section continuous coil and the incoming end of the eighth-section continuous coil, cross-over wiring is carried out in the standard cross-over way of double conductors. The standard cross-over way of double conductors is to sequentially cross-over connect the four two-combined conductors in the previous-section continuous coil to the four two-combined conductors in the next-section continuous coil;
[0010] Between the outgoing end of the second-section continuous coil and the incoming end of the third-section continuous coil, and between the outgoing end of the sixth-section continuous coil and the incoming end of the seventh-section continuous coil, cross-over wiring is carried out in the 2-2 cross-over way. The 2-2 cross-over way is to cross-over and sequentially connect the first two two-combined conductors in the previous-section continuous coil to the last two two-combined conductors in the next-section continuous coil, and cross-over and sequentially connect the last two two-combined conductors in the previous-section continuous coil to the first two two-combined conductors in the next-section continuous coil;
[0011] Between the outgoing end of the fourth-section continuous coil and the incoming end of the fifth-section continuous coil, cross-over wiring is carried out in the standard cross-over way of single conductors. The standard cross-over way of single conductors is to cross the single conductors of the four two-combined conductors in the previous-section continuous coil respectively and then sequentially cross-over connect them to the four two-combined conductors in the next-section continuous coil.
[0012] Preferably, the two-combined conductor includes two bare conductors. Each bare conductor is first wrapped with an inner insulating layer to form two separate conductors, and then the two separate conductors are combined together and wrapped with an outer insulating layer to form the two-combined conductor.
[0013] Preferably, the cross-over wiring positions of the 2-2 cross-over way and the standard cross-over way of single conductors are located on the surface position on the outer diameter side of the coil.
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1. After transposing the completely transposed transformer winding with four two-combined conductors, when winding the transformer winding with 8 conductors, the spatial positions occupied by the 8 conductors are exactly the same, that is, 8 conductors are distributed at each position from the outer diameter side to the inside of the entire winding. Therefore, the effect of complete transposition is achieved. After complete transposition, there is no voltage difference between the 8 conductors winding the winding, and thus no circulating current loss (or transposition loss) will be generated. This is because once the transposition of the four two-combined conductors on the continuous coil reaches complete transposition, it means that the 8 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 8 conductors have the same length, induced voltage, resistance, and passing current (or load capacity). Since there is no voltage difference between the 8 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. 2. In addition, for the complete transposition of the four two-combined conductors on the continuous coil, when complete transposition is achieved, compared with the combination methods of other numbers of conductors, the number of conductors cut and then welded is the least, the production cycle is short, and the man-hour cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:
[0016] Figure 1 is a schematic diagram of the coil wiring of an embodiment of the completely transposed transformer winding with four two-combined conductors of the present utility model.
[0017] Figure 2 is a simplified schematic diagram of the coil wiring of an embodiment of the completely transposed transformer winding with four two-combined conductors of the present utility model.
[0018] Figure 3 -(a), Figure 3 -(b) and Figure 3 -(c) are respectively schematic diagrams of three different combination methods when winding the coil with 8 conductors.
[0019] Figure 4 is a simplified schematic diagram of the coil wiring of the control example in which two four-combined conductors are completely transposed.
[0020] Figure 5 is a schematic diagram of the coil wiring of the control example in which all standard cross transposition methods are adopted.
[0021] In the figure, the reference numerals denote:
[0022] The first-stage continuous coil 100;
[0023] The first turn of the coil 100-1, the first turn of the first two combined conductors 101, the first turn of the first single conductor 1011, the first turn of the second single conductor 1012; the first turn of the second two combined conductors 102, the first turn of the third two combined conductors 103, the first turn of the fourth two combined conductors 104;
[0024] The second turn of the coil 100-2, the second turn of the first two combined conductors 105, the second turn of the first single conductor 1051, the second turn of the second single conductor 1052; the second turn of the second two combined conductors 106, the second turn of the third single conductor 1061, the second turn of the fourth single conductor 1062; the second turn of the third two combined conductors 107, the second turn of the fifth single conductor 1071, the second turn of the sixth single conductor 1072; the second turn of the fourth two combined conductors 108, the second turn of the seventh single conductor 1081, the second turn of the eighth single conductor 1082;
[0025] The second-stage continuous coil 200, the third-stage continuous coil 300, the fourth-stage continuous coil 400, the fifth-stage continuous coil 500, the sixth-stage continuous coil 600, the seventh-stage continuous coil 700, the eighth-stage continuous coil 800;
[0026] The bare conductor 900, the turn insulation 901, the inner insulation 902, the outer insulation 903;
[0027] The 2-2 cross-over method A, the double-conductor standard cross-over method B, the single-conductor standard cross-over method C;
[0028] Position I, Position II, Position III, Position IV, Position V, Position VI, Position VII, Position VIII. Specific embodiments
[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0030] In one embodiment, a fully transposed transformer winding with four two-combined conductors is provided, as Figure 1 shown. The fully transposed transformer winding with four two-combined conductors is realized in the following manner:
[0031] 1. Wind eight sections of continuous coils by using the method of parallel winding with four two-combined conductors. All these eight sections of continuous coils are used for winding on the iron core of the transformer. Among them,Figure 1 Among them, the eight-section continuous coils are the first-section continuous coil 100, the second-section continuous coil 200, the third-section continuous coil 300, the fourth-section continuous coil 400, the fifth-section continuous coil 500, the sixth-section continuous coil 600, the seventh-section continuous coil 700, and the eighth-section continuous coil 800. Each of these eight-section continuous coils has two turns (two loops). In other embodiments, it can also be wound into other numbers of turns. One turn on the upper side is located at the surface position on the outer diameter side of the coil, and one turn on the lower side is located at the bottom position on the inner diameter side of the coil.
[0032] When specifically winding the coils around the iron core of the transformer, it is preferred that the number of sections of the continuous coil wound in the way of parallel winding with four two-combined wires is a multiple of 8, such as 8 sections, 16 sections, or 24 sections, etc.
[0033] Among the four two-combined wires, each two-combined wire includes 2 single wires, and the row numbers of the 8 single wires in each turn of each continuous coil are in the same order. Taking Figure 1 the first-section continuous coil 100 in it as an example, it includes the first-turn coil 100-1 and the second-turn coil 100-2. The first-turn coil 100-1 is located on the outer diameter side, and the second-turn coil 100-2 is located on the inner diameter side. The row numbers of the 8 single wires in the first-turn coil 100-1 and the 8 single wires in the second-turn coil 100-2 are in the same order, and the row number order is all "1-2-3-4-5-6-7-8". Taking the first-turn coil 100-1 as an example, it includes four two-combined wires, which are the first-turn first two-combined wire 101, the first-turn second two-combined wire 102, the first-turn third two-combined wire 103, and the first-turn fourth two-combined wire 104. Among them, taking the first-turn first two-combined wire 101 as an example, it includes 2 single wires, which are the first-turn first single wire 1011 and the first-turn second single wire 1012.
[0034] Since the first-section continuous coil 100 is a continuous coil, the leading ends of the 8 single wires in its first-turn coil 100-1 are the electrical input ends of the entire winding, and the trailing ends are electrically connected to the 8 single wires in the second-turn coil 100-2 in sequence according to the row number order. For example, the trailing end of the first-turn first single wire 1011 is electrically connected to the leading end of the single wire with the row number "1" in the second-turn coil 100-2 (the second-turn first single wire 1051).
[0035] Second, as Figure 1As shown, between the outgoing end of the first continuous coil 100 and the incoming end of the second continuous coil 200, between the outgoing end of the third continuous coil 300 and the incoming end of the fourth continuous coil 400, between the outgoing end of the fifth continuous coil 500 and the incoming end of the sixth continuous coil 600, and between the outgoing end of the seventh continuous coil 700 and the incoming end of the eighth continuous coil 800, cross-over wiring is carried out using the double-wire standard cross-over method B. The double-wire standard cross-over method is to sequentially cross-connect the four two-group wires in the previous continuous coil to the four two-group wires in the subsequent continuous coil.
[0036] Taking the cross-over wiring between the outgoing end of the first continuous coil 100 and the incoming end of the second continuous coil 200 using the double-wire standard cross-over method B as an example, the outgoing end of the first two-group wire 101 in the first turn of the first continuous coil 100 is the end of the two single wires numbered "1, 2" in the second turn of the coil 100-2 (the second single wire 1051 and the second single wire 1052 included in the second two-group wire 105 in the second turn of the coil 100-2); the outgoing end of the second two-group wire 102 in the first turn of the first continuous coil 100 is the end of the two single wires numbered "3, 4" in the second turn of the coil 100-2 (the third single wire 1061 and the fourth single wire 1062 included in the second two-group wire 106 in the second turn of the coil 100-2); the outgoing end of the third two-group wire 103 in the first continuous coil 100 is the end of the two single wires numbered "5, 6" in the second turn of the coil 100-2 (the fifth single wire 1071 and the sixth single wire 1072 included in the second two-group wire 107 in the second turn of the coil 100-2); the outgoing end of the fourth two-group wire 104 in the first continuous coil 100 is the end of the two single wires numbered "7, 8" in the second turn of the coil 100-2 (the seventh single wire 1081 and the eighth single wire 1082 included in the second two-group wire 108 in the second turn of the coil 100-2). After the first continuous coil 100 and the second continuous coil 200 are cross-over wired using the double-wire standard cross-over method B, the numbering order of the four two-group wires in the second continuous coil 200 is cross-overed, that is, the numbering order of the eight single wires in each of the two turns of the second continuous coil 200 is changed to "7, 8, 5, 6, 3, 4, 1, 2".
[0037] III. Between the outgoing end of the second continuous coil 200 and the incoming end of the third continuous coil 300, and between the outgoing end of the sixth continuous coil 600 and the incoming end of the seventh continuous coil 700, a 2-2 cross transposition method A is adopted for transposition wiring. The 2-2 cross transposition method A is to transpose the first two combined conductors in the previous continuous coil and connect them in sequence to the last two combined conductors in the subsequent continuous coil, and transpose the last two combined conductors in the previous continuous coil and connect them in sequence to the first two combined conductors in the subsequent continuous coil.
[0038] Taking the transposition wiring between the outgoing end of the second continuous coil 200 and the incoming end of the third continuous coil 300 by using the 2-2 cross transposition method A as an example:
[0039] The outgoing end of the first combined conductor in the second continuous coil 200 is the end of the two single conductors numbered "7, 8" in the first turn of the coil (outer diameter side); the outgoing end of the second combined conductor in the second continuous coil 200 is the end of the two single conductors numbered "5, 6" in the first turn of the coil; the incoming end of the third combined conductor in the third continuous coil 300 is the end of the two single conductors numbered "7, 8" in the first turn of the coil; the incoming end of the fourth combined conductor in the third continuous coil 300 is the end of the two single conductors numbered "5, 6" in the first turn of the coil;
[0040] The outgoing end of the third combined conductor in the second continuous coil 200 is the end of the two single conductors numbered "3, 4" in the first turn of the coil; the outgoing end of the fourth combined conductor in the second continuous coil 200 is the end of the two single conductors numbered "1, 2" in the first turn of the coil; the incoming end of the first combined conductor in the third continuous coil 300 is the end of the two single conductors numbered "3, 4" in the first turn of the coil; the incoming end of the second combined conductor in the third continuous coil 300 is the end of the two single conductors numbered "1, 2" in the first turn of the coil;
[0041] During transposition, the first and second combined conductors in the second continuous coil 200 are transposed and connected in sequence to the third and fourth combined conductors in the third continuous coil 300, and the third and fourth combined conductors in the second continuous coil 200 are transposed and connected in sequence to the first and second combined conductors in the third continuous coil 300;
[0042] That is, after the transposition is completed, the row numbers of the 8 single wires in each of the two turns of the third continuous coil 300 are changed to "3, 4, 1, 2, 7, 8, 5, 6".
[0043] IV. A single-wire standard cross transposition method C is used for transposition wiring between the outgoing end of the fourth continuous coil 400 and the incoming end of the fifth continuous coil 500. The single-wire standard cross transposition method C is to cross the single wires of each of the four two-wire combinations in the previous continuous coil and then connect them in sequence to the four two-wire combinations in the subsequent continuous coil.
[0044] Specifically, the outgoing end of the first two-wire combination in the fourth continuous coil 400 is the ends of the 2 single wires numbered "5, 6" in the first turn of the coil (outer diameter side); the outgoing end of the second two-wire combination in the fourth continuous coil 400 is the ends of the 2 single wires numbered "7, 8" in the first turn of the coil; the outgoing end of the third two-wire combination in the fourth continuous coil 400 is the ends of the 2 single wires numbered "1, 2" in the first turn of the coil; the outgoing end of the fourth two-wire combination in the fourth continuous coil 400 is the ends of the 2 single wires numbered "3, 4" in the first turn of the coil;
[0045] When using the single-wire standard cross transposition method C for transposition wiring between the outgoing end of the fourth continuous coil 400 and the incoming end of the fifth continuous coil 500, the two single wires of each of the first two-wire combination, the second two-wire combination, the third two-wire combination, and the fourth two-wire combination in the fourth continuous coil 400 cross and then are respectively connected to the two single wires of each of the fourth two-wire combination, the third two-wire combination, the second two-wire combination, and the first two-wire combination in the fifth continuous coil 500.
[0046] That is, after the transposition using the single-wire standard cross transposition method C is completed, after the single wires of each of the four two-wire combinations in the fourth continuous coil 400 cross and are connected in sequence to the four two-wire combinations in the fifth continuous coil 500, the row numbers of the 8 single wires in each of the two turns of the fifth continuous coil 500 are changed to "4, 3, 2, 1, 8, 7, 6, 5".
[0047] V. After all the transpositions of the eight-section continuous coil are completed in the above manner, the row numbers of the 8 single conductors in each of the two turns of the first-section continuous coil 100 are in the order of "1, 2, 3, 4, 5, 6, 7, 8", and the row numbers of the 6 single conductors in each of the two turns of the second-section continuous coil 200 are changed to "7, 8, 5, 6, 3, 4, 1, 2", the row numbers of the 8 single conductors in each of the two turns of the third-section continuous coil 300 are changed to "3, 4, 1, 2, 7, 8, 5, 6", the row numbers of the 8 single conductors in each of the two turns of the fourth-section continuous coil 400 are changed to "5, 6, 7, 8, 1, 2, 3, 4", the row numbers of the 8 single conductors in each of the two turns of the fifth-section continuous coil 500 are changed to "4, 3, 2, 1, 8, 7, 6, 5", the row numbers of the 8 single conductors in each of the two turns of the sixth-section continuous coil 600 are changed to "6, 5, 8, 7, 5, 2, 1, 3, 4", the row numbers of the 8 single conductors in each of the two turns of the seventh-section continuous coil 700 are changed to "2, 1, 4, 3, 6, 5, 8, 7", and the row numbers of the 8 single conductors in each of the two turns of the eighth-section continuous coil 800 are changed to "8, 7, 6, 5, 4, 3, 2, 1".
[0048] According to Figure 1 It can be seen that after transposing the fully transposed transformer winding using the four two-combined conductors, when winding the transformer winding with 8 conductors, the number of space positions occupied by the 8 conductors is exactly the same, that is, 8 conductors with different row numbers are distributed at each position (Position I, Position II, Position III, Position IV, Position V, Position VI, Position VII, Position VIII) from the outer diameter side to the inside of the entire winding. Therefore, the effect of complete transposition is achieved. After complete transposition, there is no voltage difference between the 8 conductors for winding the winding, and thus no circulating current loss (or transposition loss) will be generated.
[0049] This is because once the transposition of the four two-combined conductors on the continuous coil reaches complete transposition, it means that the 8 conductors occupy the same number of space positions in the space position of the entire coil. The same number of space positions means that the 8 conductors have the same length, the same induced voltage, the same resistance, and the same current passing through (or the same load capacity). Since there is no voltage difference between the 8 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.
[0050] It can be seen from the above embodiments that in practical applications of this method, as long as the total number of sections of the continuous coil is an integer multiple of 8, for the four two-combined conductors, complete transposition can be achieved according to the transposition method in this method. The simplified schematic diagram of the transposition method in this method is as Figure 2 shown, Figure 2In this case, D is the total number of coil segments. For the fully transposed transformer winding of these four two - combined conductors, special cross - transpositions (2 - 2 cross - transposition method) are carried out at the inter - segment planes at the one - quarter and three - quarter positions of the total number of segments (or the total number of coil pancakes), and a single - conductor standard cross - transposition is carried out at the inter - segment plane at the half - segment position. The transposition methods for the inter - segment planes and bottom positions of the remaining segments still follow the traditional double - conductor standard cross - transposition. After transposition according to this method, full transposition can be achieved.
[0051] In the practical application of this method, if the total number of segments of the continuous coil is not an integer multiple of 8, for the four two - combined conductors, full transposition cannot be achieved. However, even if full transposition cannot be achieved, the incomplete transposition rate is much lower than that obtained by using the traditional standard cross - transposition.
[0052] In this embodiment, the meaning of "2 - 2" in the 2 - 2 cross - transposition method A is as follows: "2" represents a transposition method with two two - combined conductors as one group; "single" in the single - conductor standard cross - transposition method C represents a transposition method with one conductor as one group; "double" in the double - conductor standard cross - transposition method B represents a transposition method with two conductors as one group.
[0053] In the fully transposed transformer winding of these four two - combined conductors, the technological processes of the two special cross - transpositions (2 - 2 cross - transposition method) are the same as those in the traditional standard cross - transposition wiring, and the wires do not need to be cut. However, the technological process of the single - conductor standard cross - transposition carried out at the inter - segment plane at the half - segment position in this method is different from that of the traditional standard cross - transposition. In the traditional standard cross - transposition, the transposition can be completed without cutting the four two - combined conductors, while in the single - conductor standard cross - transposition method adopted in this method, the four two - combined conductors need to be cut first (i.e., a total of 8 wires are cut), the turn insulation is stripped, and then according to Figure 1 After welding at the corresponding transposition positions shown in and processing the welding points according to the process requirements, the turn insulation is wrapped again to complete the transposition.
[0054] Since the two special cross - transpositions (2 - 2 cross - transposition method) and the single - conductor standard cross - transposition method in this method are different from the traditional transposition methods when completing the transposition, if the transposition position is set at the bottom position (inner diameter side), once an error occurs during the manufacturing process, because the transposition is set on the inner diameter side, the operating space is blocked and error correction is impossible. Therefore, the two special cross - transpositions (2 - 2 cross - transposition method) and the single - conductor standard cross - transposition method in this method are both set at the surface position (outer diameter side). Once an error occurs during the manufacturing process, because the transposition is set on the outer diameter side, the operating space is not blocked and error correction is convenient.
[0055] The transposition method of this method is simple and clear, facilitating coil design and manufacturing. The two special cross transpositions (2-2 cross transposition method) and one standard cross transposition method for single wires are all set at the surface position (outer diameter side), which is convenient for error correction. When achieving complete transposition, the number of cuts required for the four two-combined wires is the least (8 cuts), and the number of welds required is the lowest (8 welds).
[0056] Furthermore, in another embodiment, in the completely transposed transformer winding of the four two-combined wires, the two combined wires include two bare wires. Each bare wire is first wrapped with an inner insulating layer to form two separate wires, and then the two separate wires are combined together and wrapped with an outer insulating layer, that is, two combined wires are formed.
[0057] Combined Figure 3 As shown, in the actual application of the transformer coil, when winding the coil with 8 wires, the 8 wires can be composed of 8 ordinary wires (as shown in Figure 3 -(a)), four two-combined wires (as shown in Figure 3 -(b)), or two four-combined wires (as shown in Figure 3 -(c)).
[0058] Among them, as shown in Figure 3 -(a), when using 8 ordinary wires, since the turn insulation 901 of each bare wire 900 is independent insulation, the total height dimension H1 of the 8 ordinary wires is large, resulting in a large coil volume, low coil filling rate, large material consumption, and high cost.
[0059] Next, let's look at Figure 3 the wire shown in Figure 3 -(b). For the four two-combined wires in Figure 3 -(b), since each bare wire 900 is first wrapped with an inner insulation 902 and then the two wires are combined together and wrapped with an outer insulation 903, the turn insulation of the two combined wires = inner insulation + outer insulation, resulting in the total height dimension H2 of the three two-combined wires < H1, the coil volume < Figure 3 the way shown in Figure 3 -(a), the coil filling rate > Figure 3 -(a), the material consumption <
[0060] Finally, let's look at Figure 3 the wire shown in Figure 3 -(c), which are two four-combined wires. Since each bare wire 900 is also first wrapped with an inner insulation 902 and then the four wires are combined together and wrapped with an outer insulation 903, the turn insulation of the four combined wires is also = inner insulation + outer insulation, but the total height dimension H3 of the two four-combined wires < H2 < H1, the coil volume < Figure 3 -(b) < Figure 3-(a), coil filling ratio > Figure 3 -(b) > Figure 3 -(a), material consumption < Figure 3 -(b) < Figure 3 -(a), cost < Figure 3 -(b) < Figure 3 -(a).
[0061] As can be seen from the above comparative analysis: In the combination form of 8 wires, Figure 3 -(c) The combination form of four two - combined wires can minimize the total height dimension of the wires, minimize the coil volume, maximize the coil filling ratio, minimize the material consumption, and minimize the cost.
[0062] However, when two four - combined wires achieve complete transposition, the minimum number of times the wires need to be cut and then welded is 24 times (as shown in the comparative example, between the second continuous coil 200 and the third continuous coil 300, between the fourth continuous coil 400 and the fifth continuous coil 500, and between the sixth continuous coil 600 and the seventh continuous coil 700, the wires need to be cut), resulting in a long production cycle and high labor cost. While when four two - combined wires achieve complete transposition, the minimum number of times the wires need to be cut and then welded is 8 times (as shown in Figure 4 , as shown in Figure 1 , as shown in Figure 2 ), with a short production cycle and low labor cost.
[0063] To sum up, under the premise of considering multiple factors such as material cost, production cycle, and labor cost, the combination form of four two - combined wires is the best in the combination form of 8 wires. Since the combination form of four two - combined wires is the best in the combination form of 8 wires, if complete transposition can be achieved, it is of great significance for cost reduction and efficiency improvement of the entire transformer.
[0064] As a comparison, as shown in Figure 5 , if all sections of the four two - combined wires adopt the traditional double - wire standard cross - transposition method for transposition, complete transposition cannot be achieved. For the convenience of analysis, still taking the total number of sections (D) of the continuous coil = 8 sections and the number of turns per section = 2 turns as an example, its winding schematic diagram is as shown in Figure 5 In Figure 5 , the eight - section continuous coil is respectively the first - section continuous coil 100, the second - section continuous coil 200, the third - section continuous coil 300, the fourth - section continuous coil 400, the fifth - section continuous coil 500, the sixth - section continuous coil 600, the seventh - section continuous coil 700, and the eighth - section continuous coil 800. According to Figure 5It can be seen that if the four two - combined conductors are transposed in accordance with the standard cross - transposition method of two conductors for all inter - segment positions, the spatial positions occupied by the eight conductors are different, and complete transposition is not achieved. There is still a voltage difference among the eight conductors due to the incomplete transposition, and the existence of the voltage difference will generate circulating current losses (or transposition losses).
[0065] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device.
[0066] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A fully transposed transformer winding with four two-combination conductors, characterized in that: include: The eight-section continuous coil is wound by winding four two-combination wires in parallel. Each of the four two-combination wires includes two single wires, and the order of the eight single wires in each turn of the coil in each continuous coil is consistent; the eight-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, a sixth section continuous coil, a seventh section continuous coil, and an eighth 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, the outlet end of the fifth continuous coil and the inlet end of the sixth continuous coil, and the outlet end of the seventh continuous coil and the inlet end of the eighth continuous coil are respectively connected by a double-wire standard cross-transposition method, wherein the double-wire standard cross-transposition method is to sequentially transpose the four two-combination wires in the previous continuous coil to the four two-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 sixth continuous coil and the inlet end of the seventh continuous coil are respectively connected in a 2-2 cross-transposition manner, wherein the 2-2 cross-transposition manner is to transpose the first two two-combination conductors in the first continuous coil and connect them in sequence to the last two two-combination conductors in the last continuous coil, and to transpose the last two two-combination conductors in the first continuous coil and connect them in sequence to the first two two-combination conductors in the last continuous coil; The output end of the fourth continuous coil and the input end of the fifth continuous coil are connected by a single-wire standard cross-transposition method, wherein the single-wire standard cross-transposition method is to cross the single wires of the four two-combination wires in the previous continuous coil and then sequentially transpose and connect them to the four two-combination wires of the next continuous coil.
2. The fully transposed transformer winding of four two-combination conductors according to claim 1 is characterized in that: The two combined conductors include two bare conductors, each bare conductor is firstly wrapped with an inner insulating layer to form two separate conductors, and then the two separate conductors are combined together and wrapped with an outer insulating layer to form the two combined conductors.
3. The fully transposed transformer winding of four two-combination conductors according to claim 1 is characterized in that: The transposition wiring position of the 2-2 cross transposition method and the single-conductor standard cross transposition method is located on the surface of the coil outer diameter side.