Method for transposition of three parallel-wound continuous coils

Abstract

The invention discloses a transposition method for three parallel-wound continuous coils, and particularly relates to the field of transformer manufacturing, which comprises the following steps: three wires are wound in parallel, two adjacent wires are subjected to transposition at each transposition position of the inner diameter side and the outer diameter side, the other wire is not subjected to transposition, and after six times of transposition, the three wires are subjected to one-time complete transposition. The coil is reasonable and simple in structure and convenient to wind, one-time complete transposition can be completed for every six sections, the problem that transposition of three parallel-wound continuous coils is incomplete is solved, and the problems that due to incomplete transposition, large circulating current is generated, transformer load loss is increased, and coil hot-spot temperature rise is caused are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer manufacturing, and more specifically, to a method for transposing a three-parallel continuous coil. Background Art

[0002] For high-voltage and large-capacity power transformers, the phase current flowing through the coil is very large. Usually, one or two transposed conductors are used to wind the continuous coil. When the number of cores of the transposed conductor is too large, problems such as small wire jumping and short circuit between strands of small wires are likely to occur during the winding of the coil, threatening the safe operation of the transformer. With the development of the power grid, the capacity of the transformer is continuously increasing, and the phase current of the coil also increases accordingly. When the phase current of the coil is too large, due to the limitation of the processing ability of the transposed conductor and the limitation of the coil winding process, it becomes an inevitable choice to wind the continuous coil with three parallel transposed conductors. However, when using the traditional transposition method to wind the three-parallel continuous coil, the transposition is incomplete, and a large circulating current will be generated in the coil under the action of the leakage magnetic field, thereby increasing the load loss of the transformer and the temperature rise of the coil hot spot. Summary of the Invention

[0003] The method for transposing a three-parallel continuous coil provided by the present invention aims to solve the problem that the existing transposition method for winding a three-parallel continuous coil is incomplete, and a large circulating current will be generated in the coil under the action of the leakage magnetic field, thereby increasing the load loss of the transformer and the temperature rise of the coil hot spot.

[0004] To achieve the above object, the present invention provides the following technical solution: A method for transposing a three-parallel continuous coil, comprising:

[0005] Step 1, obtaining three conductors;

[0006] Step 2, transposing two adjacent conductors at adjacent inner diameter side and outer diameter side positions, and the other conductor is not transposed;

[0007] Wherein, the adjacent inner diameter side and outer diameter side positions refer to starting from the inner diameter side / outer diameter side of the first layer, then the next transposition position is the outer diameter side / inner diameter side of the second layer, and the next transposition position is the inner diameter side / outer diameter side of the third layer;

[0008] Step 3, repeating in this way.

[0009] In a preferred embodiment, starting from the inner diameter side, the first conductor and the second conductor are transposed at the inner diameter side, and the third conductor is not transposed. After six transpositions, the three conductors complete a complete transposition.

[0010] In a preferred embodiment, starting from the inner diameter side, the second and third wires are staggered and transposed on the inner diameter side, while the first wire is not transposed. After six transpositions, the three wires complete a full staggered transposition.

[0011] The beneficial effects of the present invention are as follows:

[0012] The structure of the present invention is reasonable and simple, and it is convenient to wind. Each six segments can complete a full transposition, solving the problem of incomplete transposition of the continuous coil wound with three wires in parallel, and avoiding the problems of generating a large circulating current, increasing the load loss of the transformer, and the temperature rise of the coil hot spot caused by incomplete transposition. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of Embodiment 1 of the present invention.

[0014] Figure 2 It is a schematic diagram of Embodiment 2 of the present invention.

[0015] Reference numerals are: 1. Wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0017] Embodiment 1

[0018] Referring to the attached Figures 1 to 2 specification, a method for transposing a continuous coil wound with three wires in parallel includes: three wires 1 wound in parallel, and at each transposition at the inner diameter side and the outer diameter side, two adjacent wires 1 are transposed, while the other wire 1 is not transposed. After six transpositions, the three wires 1 complete a full transposition.

[0019] It should be noted that the total number of segments of the coil is a multiple of six. At each inner diameter side and outer diameter side transposition point, only two adjacent wires are transposed, and the other wire is not transposed. After six transpositions, the three wires 1 complete one full transposition. When the total number of segments of the coil is a multiple of six, the three wires 1 are fully transposed. When the coil 1 is in operation, the position of the wire 1 determines the magnetic field distribution and the change of magnetic flux it experiences. After full transposition, each wire 1 will operate at different positions. Therefore, the magnetic field distribution and the change of magnetic flux it experiences are uniform and balanced. At the same time, the magnetic field cannot be completely concentrated inside the coil 1 and leaks out to form a magnetic field. During the transposition process of the coil 1, the exchange of the positions of the wires 1 will also cause the distribution of the leakage magnetic field to change. However, since each wire 1 will experience the same magnetic field distribution at different positions after transposition, the influence of the leakage magnetic field is evenly dispersed throughout the coil and will not cause the generation of circulating current.

[0020] It should also be noted that through the transposition operation, each wire 1 can operate at different positions, thereby reducing the influence of uneven wear and extending the service life of the coil. Each wire 1 has the opportunity to be cooled at different positions, thus evenly dispersing the heat and reducing the overall temperature rise of the coil.

[0021] Refer to the attached drawings of the specification Figure 1 , the first wire 1 and the second wire 1 are transposed first, and the third wire 1 is not transposed. After six transpositions, the three wires 1 complete one full transposition.

[0022] It should be noted that the total number of segments of the coil is a multiple of six. The first wire 1 and the second wire 1 are transposed first, and the third wire 1 is not transposed. After six transpositions, the three wires 1 complete one full transposition.

[0023] Embodiment 2

[0024] Refer to the attached drawings of the specification Figure 2 , the second wire 1 and the third wire 1 are transposed first, and the first wire 1 is not transposed. After six transpositions, the three wires 1 complete one full transposition.

[0025] It should be noted that the total number of segments of the coil is a multiple of six. The second wire 1 and the third wire 1 are transposed first, and the first wire 1 is not transposed. After six transpositions, the three wires 1 complete one full transposition.

[0026] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A method for transposing three parallel-wound continuous coils, characterized in that: include: Obtain three wires (1); Two adjacent conductors (1) are interlaced at adjacent inner diameter sides and outer diameter sides, and the other conductor (1) is not interlaced; Among them, the adjacent inner diameter side and outer diameter side positions refer to starting from the inner diameter side / outer diameter side of the first layer, the next staggered position is the outer diameter side / inner diameter side of the second layer, and the next staggered position is the inner diameter side / outer diameter side of the third layer, and so on.

2. A method for transposing three parallel-wound continuous coils according to claim 1, characterized in that: Starting from the inner diameter side, the first conductor (1) and the second conductor (1) are interlaced on the inner diameter side, and the third conductor (1) is not interlaced. After six interlaced transpositions, the three conductors (1) complete a complete interlaced transposition.

3. A method for transposing three parallel-wound continuous coils according to claim 1, characterized in that: Starting from the inner diameter side, the second conductor (1) and the third conductor (1) are interlaced and transposed on the inner diameter side, and the first conductor (1) is not interlaced and transposed. After six transpositions, the three conductors (1) complete a complete interlaced transposition.

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