Multi-conductor parallel-wound full-continuous coils and transformers

Abstract

The present application relates to a multi-conductor parallel-wound fully continuous coil and transformer, including a winding group composed of more than three conductors in parallel, the winding group includes winding segments of an even integer multiple of the number of conductors, and more than three conductors are transposed between adjacent winding segments by a cross-transposition method, so that in any winding segment with a continuous number of conductors, more than three conductors at any position of the winding segment are not repeated. In the above-mentioned multi-conductor parallel-wound fully continuous coil and transformer, more than three conductors are transposed between adjacent winding segments by a cross-transposition method, which can realize a fully continuous parallel winding with more than three conductors completely transposed, thereby increasing the number of overall winding segments of the coil in a full-segment manner and reducing the unit heat load.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission and transformation equipment, and in particular to a multi-conductor parallel-wound full-continuous coil and a transformer. Background Art

[0002] Continuous winding is a common winding structure for transformers. For large-capacity transformers, multiple wires are often wound in parallel. In order to improve the heat dissipation performance of the coil, it is often necessary to increase the number of winding sections. Traditionally, a 0.5 integer multiple coil implementation method has been proposed, but it is only for coils used for 2 parallel wires. For large-capacity transformers, especially power transformers, each turn of the coil often requires 3, 4 or even more wires in parallel. The coil implementation method is not suitable for the traditional full-continuous type, nor is it suitable for the above-mentioned 0.5 integer multiple full-continuous coil implementation method. There is an urgent need for a full-continuous coil implementation method that can be used for more than 3 wires wound in parallel. Summary of the invention

[0003] Based on this, it is necessary to provide a multi-conductor parallel-wound full-continuous coil and transformer that can be used for more than three conductors to be wound in parallel in order to address the above-mentioned problems.

[0004] A multi-conductor parallel-wound full-continuous coil includes a winding group consisting of more than three parallel-connected conductors, the winding group includes winding segments that are even integer multiples of the number of conductors, and the more than three conductors are transposed between adjacent winding segments by cross-transposition, so that in any winding segment with a continuous number of conductors, the more than three conductors at any position in the winding segment are not repeated.

[0005] A transformer comprises any one of the above-mentioned multi-conductor parallel-wound full-continuous coils.

[0006] The above-mentioned multi-conductor parallel-wound full-continuous coil and transformer, the winding group includes winding segments that are even integer multiples of the number of conductors, and more than three conductors are transposed between adjacent winding segments by cross-transposition, so that in any winding segment with a continuous number of conductors, more than three conductors at any position in the winding segment are not repeated, and full-continuous parallel winding with complete transposition of more than three conductors can be achieved, thereby increasing the overall number of winding segments of the coil in a full-segment manner and reducing the unit heat load. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of a fully continuous coil with multiple conductors wound in parallel in one embodiment;

[0008] Figure 2 A schematic diagram of a fully continuous coil with multiple conductors wound in parallel in another embodiment;

[0009] Figure 3A schematic diagram of a fully continuous coil with multiple conductors wound in parallel in another embodiment;

[0010] Figure 4 A schematic diagram of a fully continuous coil with multiple conductors wound in parallel in yet another embodiment;

[0011] Figure 5 It is a schematic diagram of a fully continuous coil with multiple conductors wound in parallel in yet another embodiment. DETAILED DESCRIPTION

[0012] In one embodiment, a multi-conductor parallel-wound fully continuous coil includes a winding group consisting of more than three conductors connected in parallel, the winding group includes winding segments that are even integer multiples of the number of conductors, and the more than three conductors are transposed between adjacent winding segments by cross-transposition, so that in any winding segment with a continuous number of conductors, the more than three conductors at any position in the winding segment are not repeated.

[0013] Specifically, for large-capacity transformers, especially power transformers, each turn of the coil often requires 3, 4 or even more wires in parallel. In order to facilitate the lead-out of the coil, the winding segment of each coil is an even integer multiple of the number of wires. In order to improve the heat dissipation performance of the coil (winding segment), it is often necessary to increase the number of coils. The above-mentioned multi-wire parallel-wound full-continuous coil, the winding group includes winding segments that are an even integer multiple of the number of wires, and more than 3 wires are transposed between adjacent winding segments by cross-transposition, so that in any winding segment with a continuous number of wires, more than 3 wires at any position of the winding segment are not repeated, and more than 3 wires can be completely transposed in full-continuous parallel winding, so as to increase the overall number of winding segments of the coil in a full-segment manner and reduce the unit heat load.

[0014] In one embodiment, the average number of turns of the winding segment is n+i / k turns, wherein n is the number of turns of the wire, k is the number of wires, i is the number of turns of the wire, 1≤i≤k-1, 1≤n.

[0015] Specifically, the average number of turns of each winding segment is n+1 / k, n+2 / k...n+(k-1) / k turns, and the fully continuous coil is completely transposed, where 1≤n. Fractional turns can increase the number of winding segments and reduce the unit heat load of the winding group, so that the coil has good mechanical properties and good ampere-turn distribution. The multi-conductor parallel fully continuous coil of the present application has a fractional turn coil with full turns characteristics, which can effectively overcome the shortcomings of traditional fractional turn coils with low radial filling rate, poor mechanical strength performance, and uneven ampere-turn distribution.

[0016] In one embodiment, each wire has a corresponding number, and the numbers of the k wires at any position in the winding segment are not repeated.

[0017] Specifically, in order to improve the convenience and accuracy of winding, each wire is numbered.

[0018] In one embodiment, the cross-transposition method is that after the k wires in the first winding segment are wound with n turns, the wires numbered 1 to i are wound with one turn, and the k wires are transposed and transitioned into the next winding segment, so that in any continuous k winding segments, the numbers of the k wires at any position in the winding segment are not repeated.

[0019] Specifically, for ease of understanding, the coil is wound with 3 or more wires, which are numbered 1, 2, 3...k respectively. According to industry practice, the winding order is from bottom to top, and the first winding segment is the positive segment. For a continuous coil, starting from the starting (first) end, the odd-numbered segments of the wire are wound from the outside to the inside, which is called the negative segment; the even-numbered segments of the wire are wound from the inside to the outside, which is called the positive segment. Assuming that the number of turns required for each segment is (n+i / k) turns, after the k wires in the first winding segment are wound with n turns, only the i wires numbered from 1 to i are taken to continue winding one turn, and the k wires enter the next winding segment unit after a specific transposition. The specific transposition means that in any continuous k segments, the numbers of the k wires in any position of the winding segment are not repeated by adopting cross transposition, and the k segment is the basic unit for complete transposition of the coil.

[0020] In one embodiment, when the number of wires is 3, the average number of turns of the corresponding winding segment is n+1 / 3 turns.

[0021] Specifically, the principles and features of the present application are described below in conjunction with the accompanying drawings, taking three parallel windings as an example. Figure 1 As shown, assuming that according to the needs of electromagnetic calculation, it is determined that the average number of turns required for each winding segment is n+1 / 3 turns; the first winding segment is a reverse segment, then the three wires No. 1, 2, and 3 are first wound on the winding mold for n turns, and the wire 1 to i, that is, the wire numbered 1, is wound again for one turn, and then the three wires No. 1, 2, and 3 enter the second winding segment through a specific cross-transposition on the inner diameter side of the coil, and the second winding segment is a positive segment, and the three wires No. 1, 2, and 3 are still wound for n turns, and the wire No. 3 is wound again for one turn, and then the three wires No. 1, 2, and 3 enter the third winding segment through a specific cross-transposition on the outer diameter side of the coil; through the specific cross-transposition, the numbers of the three wires in the width direction at any position of the winding segment are not repeated, then the 1-3 segments are the basic units of complete coil transposition, and a number of basic units can be continued to be wound according to the calculation needs.

[0022] In one embodiment, when the number of wires is 3, the average number of turns of the corresponding winding segment is n+2 / 3 turns.

[0023] Specifically, Figure 2As shown, it is assumed that according to the needs of electromagnetic calculation, it is determined that the average number of turns required for each winding segment is n+2 / 3 turns; the first winding segment is a reverse segment, then the three wires No. 1, 2, and 3 are first wound on the winding mold for n turns, and the wires 1-i, i.e., the wires numbered 1 and 2, are wound one turn, and then the three wires No. 1, 2, and 3 enter the second winding segment through a specific cross-transposition on the inner diameter side of the coil, and the second winding segment is a positive segment, and the three wires No. 1, 2, and 3 are still wound for n turns, and the wires No. 3 and 1 are wound one turn, and then the three wires No. 1, 2, and 3 enter the third winding segment through a specific cross-transposition on the outer diameter side of the coil; through the specific cross-transposition, the numbers of the three wires in the width direction at any position of the winding segment are not repeated, then the 1-3 segments are the basic units of complete coil transposition, and a number of basic units can be continued to be wound according to the calculation needs.

[0024] In one embodiment, when the number of wires is 4, the average number of turns of the corresponding winding segment is n+1 / 4 turns.

[0025] Specifically, take 4 wires wound in parallel as an example, Figure 3 As shown, assuming that according to the needs of electromagnetic calculation, it is determined that the average number of turns required for each winding segment is n+1 / 4 turns; the first winding segment is a reverse segment, then the 4 wires 1, 2, 3, and 4 are first wound on the winding mold for n turns, and the wire 1 to i, that is, the wire numbered 1, is wound again for one turn, and then the 4 wires 1, 2, 3, and 4 enter the second winding segment through a specific cross-transposition on the inner diameter side of the coil. The second winding segment is a positive segment, and the 4 wires 1, 2, 3, and 4 are still wound for n turns, and the wire 2 is wound for one turn, and then the 4 wires 1, 2, 3, and 4 are wound. The wire enters the third winding segment through a specific cross-transposition on the outer diameter side of the coil; the third winding segment is a reverse segment, then the 4 wires No. 1, 2, 3, and 4 are first wound on the winding mold for n turns, and the wire numbered 3 is wound for one turn, and then the 4 wires No. 1, 2, 3, and 4 enter the fourth winding segment through a specific cross-transposition on the inner diameter side of the coil. Through the specific cross-transposition, the numbers of the 4 wires in the width direction at any position of the winding segment are not repeated, then segments 1-4 are the basic units of complete coil transposition, and several basic units can be continued to be wound according to calculation needs.

[0026] In one embodiment, when the number of wires is 4, the average number of turns of the corresponding winding segment is n+2 / 4 turns.

[0027] Specifically, Figure 4As shown, assuming that according to the needs of electromagnetic calculation, it is determined that the average number of turns required for each winding segment is n+2 / 4 turns; the first winding segment is a reverse segment, then the 4 wires 1, 2, 3, and 4 are first wound on the winding mold for n turns, and the wires 1 to 2, i.e., the wires numbered 1 and 2, are wound one turn again, and then the 4 wires 1, 2, 3, and 4 enter the second winding segment through a specific cross-transposition on the inner diameter side of the coil. The second winding segment is a positive segment, and the 4 wires 1, 2, 3, and 4 are still wound for n turns, and the wires 4 and 3 are wound one turn again, and then the 4 wires 1, 2, 3, and 4 are wound outside the coil. The radial side enters the third winding segment through a specific cross transposition; the third winding segment is a reverse segment, then the 4 wires No. 1, 2, 3, and 4 are first wound on the winding mold for n turns, and the wires numbered 1 and 2 are wound for one turn, and then the 4 wires No. 1, 2, 3, and 4 enter the fourth winding segment through a specific cross transposition on the inner diameter side of the coil. Through the specific cross transposition, the numbers of the 4 wires in the width direction at any position of the winding segment are not repeated, then segments 1-4 are the basic units of complete coil transposition, and a number of basic units can be continued to be wound according to calculation needs, where m is an integer multiple of k.

[0028] In one embodiment, when the number of wires is 4, the average number of turns of the corresponding winding segment is n+3 / 4 turns.

[0029] Specifically, Figure 5 As shown, assuming that according to the needs of electromagnetic calculation, it is determined that the average number of turns required for each winding segment is n+3 / 4 turns; the first winding segment is a reverse segment, then the 4 wires 1, 2, 3, and 4 are first wound on the winding mold for n turns, and the wires 1 to i, i.e., the wires numbered 1, 2, and 3, are wound one turn again, and then the 4 wires 1, 2, 3, and 4 enter the second winding segment through a specific cross-transposition on the inner diameter side of the coil. The second winding segment is a positive segment, and the 4 wires 1, 2, 3, and 4 are still wound for n turns, and the wires 2, 1, and 4 are wound one turn again, and then the 4 wires 1, 2, 3, and 4 are wound on the inner diameter side of the coil. The wires enter the third winding segment through a specific cross-transposition on the outer diameter side of the coil; the third winding segment is a reverse segment, then the 4 wires No. 1, 2, 3, and 4 are first wound on the winding mold for n turns, and the wires numbered 3, 4, and 1 are wound for one turn, and then the 4 wires No. 1, 2, 3, and 4 enter the fourth winding segment through a specific cross-transposition on the inner diameter side of the coil. Through the specific cross-transposition, the numbers of the 4 wires in the width direction at any position of the winding segment are not repeated, then segments 1-4 are the basic units of complete coil transposition, and a number of basic units can be continued to be wound according to calculation needs.

[0030] It can be understood that the above figure is only one embodiment, and the wire sequence of the winding segment can be adjusted accordingly, as long as it is ensured that in any winding segment with a continuous number of wires, the numbers of the k wires at any position in the winding segment are not repeated.

[0031] In one embodiment, a transformer includes the above-mentioned multi-conductor fully continuous coil.

[0032] In the above transformer, the winding group includes winding segments with an even integer multiple of the number of conductors, and more than three conductors are transposed between adjacent winding segments by cross transposition, so that in any winding segment with a continuous number of conductors, more than three conductors at any position of the winding segment are not repeated, and more than three conductors can be completely transposed and fully wound in parallel, thereby increasing the overall number of winding segments of the coil in a full segment manner and reducing the unit heat load.

[0033] The above-mentioned multi-conductor parallel-wound fully continuous coil and transformer are based on the transformer fully continuous coil, combined with the needs of large-capacity transformers, and propose a fully continuous coil that can meet the needs of winding 3 or more conductors in parallel and can meet the needs of n+i / k turns per section. The average number of turns in each section is n+i / k turns, which can increase the overall winding section number of the coil in a full-section manner, reduce the unit heat load, improve the mechanical strength performance of the coil, and at the same time, the ampere-turns are evenly distributed.

[0034] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A multi-conductor parallel-wound full-continuous coil, characterized in that: A winding group consisting of more than three wires connected in parallel, wherein the winding group includes winding segments that are even integer multiples of the number of wires, and the more than three wires are transposed between adjacent winding segments by cross transposition, so that in any winding segment with the same number of wires, the more than three wires at any position in the winding segment are not repeated; The average number of turns of the winding segment is n+i / k turns, wherein n is the number of turns of the wire, k is the number of wires, i is the number of turns of the wire, 1≤i≤k-1, 1≤n; each wire has a corresponding number, and the numbers of the k wires in any position of the winding segment are not repeated; Among them, the first winding segment is a reverse segment; the cross-transposition method is that after the k wires in the first winding segment are wound with n turns, the wires numbered from 1 to i are wound with one turn, and the k wires are transposed and transitioned into the next winding segment, so that in any continuous k winding segments, the numbers of the k wires at any position of the winding segment are not repeated.

2. The multi-conductor parallel-wound full-continuous coil according to claim 1, characterized in that: When the number of wires is 3, the average number of turns of the corresponding winding segment is n+1 / 3 turns.

3. The multi-conductor parallel-wound full-continuous coil according to claim 1, characterized in that: When the number of wires is 3, the average number of turns of the corresponding winding segment is n+2 / 3 turns.

4. The multi-conductor parallel-wound full-continuous coil according to claim 1, characterized in that: When the number of wires is 4, the average number of turns of the corresponding winding segment is n+1 / 4 turns.

5. The multi-conductor parallel-wound full-continuous coil according to claim 1, characterized in that: When the number of wires is 4, the average number of turns of the corresponding winding segment is n+2 / 4 turns.

6. The multi-conductor parallel-wound full-continuous coil according to claim 1, characterized in that: When the number of wires is 4, the average number of turns of the corresponding winding segment is n+3 / 4 turns.

7. A transformer, characterized in that: A fully continuous coil comprising multiple conductors as claimed in any one of claims 1 to 6.

Images