Transformer balanced winding

Abstract

The application provides a transformer balanced winding, which comprises a transformer body, a first transformer body, a second transformer body, a first balanced winding, a second balanced winding, a first balanced winding connecting line and a second balanced winding connecting line; the first transformer body and the second transformer body are arranged in the transformer body, a first part of the first balanced winding is wound on the first transformer body, a second part of the first balanced winding is wound on the second transformer body, a first part of the second balanced winding is wound on the first transformer body, and a second part of the second balanced winding is wound on the second transformer body; the first part and the second part of the first balanced winding are connected through the first balanced winding connecting line, and the first part and the second part of the second balanced winding are connected through the second balanced winding connecting line. In the application, two sets of balanced windings are added to balance the magnetic flux of the iron cores of the two transformer bodies, and the output voltage on the low-voltage side is more balanced and stable.

Description

Technical Field

[0001] The present invention relates to the field of transformer manufacturing technology, and in particular to a transformer balancing winding. Background Technology

[0002] With the continuous development of my country's transformer industry, especially the development of infrastructure such as domestic metal smelting and forging, cement processing, and papermaking, the number of special transformers such as rectifier transformers required is increasing year by year. Due to their special structure, special transformers have very strict requirements on their performance parameters.

[0003] Especially for rectifier transformers with two transformer bodies connected in series on the high-voltage side, since this type of transformer is composed of two independent transformer bodies, this structural defect will result in a very poor balance of the output voltage of the secondary windings of the two bodies. There are two main reasons for the very poor output voltage balance between the two secondary windings of the transformer body: First, due to the inherent characteristics of this type of transformer connection group, there will always be a certain deviation in the no-load voltage of the two secondary windings. This deviation is inherent to the structure of this type of transformer and cannot be fundamentally eliminated. The only way to reduce the deviation is to adjust the turns ratio of the two secondary windings to be as close as possible to √3. Second, after the two transformer bodies are connected in series, the magnetic reluctance of the two cores in the two bodies is different and the difference is large, which will increase the imbalance. In addition, the core in each single transformer body is a three-phase three-limb structure. The magnetic circuits of the two outer cores are longer and have higher magnetic reluctance, while the magnetic circuit of the middle core is shorter and has lower magnetic reluctance. This difference will further increase the imbalance of the no-load voltage between the two secondary windings, making it difficult to meet the requirements of the protocol parameters. This will not only affect the rectifier equipment downstream of the transformer, but also affect the quality of the processed products. Summary of the Invention

[0004] This invention provides a transformer balancing winding to solve the problem of unbalanced no-load voltage output on the low-voltage side after two transformer bodies are connected in series on the high-voltage side.

[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a transformer balancing winding, comprising:

[0007] Transformer body, first transformer core, second transformer core, first balancing winding, second balancing winding, first balancing winding connecting line and second balancing winding connecting line;

[0008] The first transformer body and the second transformer body are disposed in the transformer body. The first part of the first balancing winding is wound on the first transformer body, the second part of the first balancing winding is wound on the second transformer body, the first part of the second balancing winding is wound on the first transformer body, and the second part of the second balancing winding is wound on the second transformer body. The first part of the first balancing winding and the second part of the first balancing winding are connected by the first balancing winding connecting line, and the first part of the second balancing winding and the second part of the second balancing winding are connected by the second balancing winding connecting line.

[0009] Optionally, the first end of the first portion of the first balancing winding is connected to the first end of the second portion of the first balancing winding, the last end of the first portion of the first balancing winding is connected to the last end of the second portion of the first balancing winding, the first end of the first portion of the second balancing winding is connected to the first end of the second portion of the second balancing winding, and the last end of the first portion of the second balancing winding is connected to the last end of the second portion of the second balancing winding, forming a loop between the first portion of the first balancing winding and the second portion of the first balancing winding; a loop is also formed between the first portion of the second balancing winding and the second portion of the second balancing winding.

[0010] Optionally, the first balancing winding and the second balancing winding have the same number of turns and the same winding method.

[0011] Optionally, the first balancing winding includes: a first end protruding from the first part of the first balancing winding, a first end protruding from the second part of the first balancing winding, a tail end protruding from the first part of the first balancing winding, and a tail end protruding from the second part of the first balancing winding.

[0012] The second balancing winding includes: a first end protruding from the first part of the second balancing winding, a first end protruding from the second part of the second balancing winding, a tail end protruding from the first part of the second balancing winding, and a tail end protruding from the second part of the second balancing winding.

[0013] Optional, also includes:

[0014] The first transformer body includes: a first iron core, and a first part of the first balancing winding and a first part of the second balancing winding are respectively wound on the first iron core;

[0015] The second transformer core includes a second iron core, with the second portion of the first balancing winding and the second portion of the second balancing winding respectively wound on the second iron core.

[0016] Optionally, the first core and the second core have the same size and structure.

[0017] Optionally, the first iron core includes a first upper yoke and a first lower yoke, and the first part of the first balancing winding and the first part of the second balancing winding are respectively wound on the first upper yoke or the first lower yoke.

[0018] The second iron core includes a second upper yoke and a second lower yoke, and the second part of the first balancing winding and the second part of the second balancing winding are respectively wound on the second upper yoke or the second lower yoke.

[0019] Optional, also includes:

[0020] The first transformer body further includes: a first core column, which is disposed between the first upper yoke and the first lower yoke, and a first main coil is placed on the first core column;

[0021] The second transformer body also includes: a second core column, which is disposed between the second upper yoke and the second lower yoke, and a second main coil is placed on the second core column.

[0022] Optionally, the first core post includes three first sub-core posts, which are respectively arranged between the first upper yoke and the first lower yoke;

[0023] The second core column includes three second sub-core columns, which are respectively arranged between the second upper yoke and the second lower yoke.

[0024] Optional, also includes:

[0025] An insulating layer is provided between the first balancing winding and the first iron core of the first transformer body and the second iron core of the second transformer body, and between the second balancing winding and the first iron core of the first transformer body and the second iron core of the second transformer body.

[0026] In this invention, by adding two sets of balancing windings, the core magnetic flux of the two transformer bodies is more balanced, the low-voltage side output voltage of the two transformer bodies is more balanced and stable, and the manufacturing difficulty and cost of the transformer are reduced. This solves the problem of unbalanced no-load voltage output on the low-voltage side after the high-voltage side of the two transformer bodies is connected in series in the prior art. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This is a top view structural schematic diagram of a transformer balancing winding provided in an embodiment of the present invention;

[0029] Figure 2 This is a side view structural schematic diagram of a transformer balancing winding provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the front view of a transformer balancing winding provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of a high-voltage series connection structure of a transformer provided in an embodiment of the present invention;

[0032] Figure 5 This is a structural schematic diagram of the D-direction cross-section of a transformer balancing winding provided in an embodiment of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please refer to Figures 1-3 This invention provides a transformer balancing winding, comprising:

[0035] Transformer body 1, first transformer body 2, second transformer body 3, first balancing winding 4, second balancing winding 5, first balancing winding connecting line 6, and second balancing winding connecting line 7;

[0036] In this embodiment of the invention, the first transformer body 2 includes: a first iron core 21, with the first part of the first balancing winding 4 and the first part of the second balancing winding 5 respectively wound on the first iron core 21; the second transformer body 3 includes: a second iron core 31, with the second part of the first balancing winding 4 and the second part of the second balancing winding 5 respectively wound on the second iron core 31; the first iron core 21 and the second iron core 31 have the same size and structure, and the first balancing winding 4 and the second balancing winding 5 have the same number of turns and winding method.

[0037] Please refer to Figure 2In this embodiment of the invention, the first balancing winding 4 and the second balancing winding 5 are wound on the upper or lower yoke of the iron core. Each transformer body only needs to be wound with two balancing windings, and the balancing windings do not occupy the position of the main coil, saving material costs. Furthermore, the winding process of the balancing windings is simpler and more convenient, improving production and processing efficiency, and can significantly reduce the unbalance of the no-load voltage output of the secondary windings of two series transformers.

[0038] The first transformer body 2 and the second transformer body 3 are disposed in the transformer body 1. The first part of the first balancing winding 4 is wound on the first transformer body and the second part of the first balancing winding 4 is wound on the second transformer body. The first part of the second balancing winding 5 is wound on the first transformer body 2 and the second part of the second balancing winding 5 is wound on the second transformer body 3. The first part of the first balancing winding 4 and the second part of the first balancing winding 4 are connected by the first balancing winding connecting line 6. The first part of the second balancing winding 5 and the second part of the second balancing winding 5 are connected by the second balancing winding connecting line 7.

[0039] In this embodiment of the invention, the first end of the first portion of the first balancing winding 4 is connected to the first end of the second portion of the first balancing winding 4, and the tail end of the first portion of the first balancing winding 4 is connected to the tail end of the second portion of the first balancing winding 4. The first end of the first portion of the second balancing winding 5 is connected to the first end of the second portion of the second balancing winding 5, and the tail end of the first portion of the second balancing winding 5 is connected to the tail end of the second portion of the second balancing winding 5. A loop is formed between the first portion of the first balancing winding 4 and the second portion of the first balancing winding 4; a loop is formed between the first portion of the second balancing winding 5 and the second portion of the second balancing winding 5; the first balancing winding includes: a first end outlet 41 of the first portion of the first balancing winding, a first... The second part of the balancing winding has a head 42 at the beginning, the first part of the balancing winding has a tail 43 at the end, and the second part of the balancing winding has a tail 44 at the end. The second balancing winding includes: a head 51 at the beginning of the first part of the second balancing winding, a head 52 at the beginning of the second part of the second balancing winding, a tail 53 at the end of the first part of the second balancing winding, and a tail 54 at the end of the second balancing winding. These are connected through the head and tail ends, forming a loop between the first part of the first balancing winding 4 and the second part of the first balancing winding 4. A loop is also formed between the first part of the second balancing winding 5 and the second part of the second balancing winding 5, so that the magnetic flux in the cores of the two transformers is balanced.

[0040] Please refer to Figure 4Currently, the connection group for a rectifier transformer with two transformer bodies connected in series on the high-voltage side is Ⅲy0-Yd11. That is, the three-phase tail end of the primary winding 011 of the first transformer body 2 is connected to the head end of the three-phase primary winding 021 of the second transformer body 3. The secondary winding 012 of the first transformer body 2 is Y-connected, and the secondary winding 022 of the second transformer body 3 is D-connected. The secondary windings 012 of the first transformer body 2 and 022 of the second transformer body 3 are electrically independent, and their output voltages are also independent. Because this type of transformer consists of two independent transformer bodies, after the two transformer bodies are connected in series, the magnetic reluctance of the two cores in the two transformer bodies is different and varies significantly. This leads to increased imbalance. In addition, the core of each individual transformer has a three-phase, three-limb structure. The magnetic circuits of the two outer core limbs are longer and have higher magnetic reluctance, while the magnetic circuit of the middle core limb is shorter and has lower magnetic reluctance. This difference will further increase the unbalance of the no-load voltage between the two secondary windings, making it difficult to meet the requirements of the protocol parameters. The traditional approach is to wind balancing windings outside the three core limbs in the transformer core, and then wind the main windings of the transformer outside the balancing windings. Although this can solve the transformer performance parameter problem, the balancing windings are inside the main windings, which increases the size and volume of the main windings and the amount of material used, resulting in complex manufacturing and higher costs.

[0041] In this embodiment of the invention, by adding two sets of balancing windings, the core magnetic flux of the two transformer bodies is more balanced, the low-voltage side output voltage of the two transformer bodies is more balanced and stable, and the manufacturing difficulty and cost of the transformer are also reduced. This solves the problem of unbalanced no-load voltage output on the low-voltage side after the high-voltage side of the two transformer bodies is connected in series in the prior art.

[0042] Please refer to Figures 1-3 In this embodiment of the invention, optionally, the first iron core 21 includes a first upper iron yoke 211 and a first lower iron yoke 212, and the first part of the first balance winding 4 and the first part of the second balance winding 5 are respectively wound on the first upper iron yoke 211 or the first lower iron yoke 212.

[0043] The second iron core 31 includes a second upper iron yoke 311 and a second lower iron yoke 312. The second part of the first balancing winding 4 and the second part of the second balancing winding 5 are respectively wound on the second upper iron yoke 311 or the second lower iron yoke 312.

[0044] In this embodiment of the invention, the balancing winding can be wound on the upper yoke of the core in each transformer body or on the lower yoke of the core in each transformer body. Only two balancing windings need to be wound in each transformer body, and the balancing windings do not occupy the position of the main coil, thus saving material costs.

[0045] Please refer to Figure 3 In this embodiment of the invention, optionally, it also includes:

[0046] The first transformer body 2 also includes: a first core column 22, which is disposed between the first upper yoke 211 and the first lower yoke 212, and the first main coil is placed on the first core column 22; the second transformer body 3 also includes: a second core column 32, which is disposed between the second upper yoke 311 and the second lower yoke 312, and the second main coil is placed on the second core column 32; the first core column 22 includes three first sub-core columns, which are respectively arranged between the first upper yoke and the first lower yoke; the second core column 32 includes three second sub-core columns, which are respectively arranged between the second upper yoke and the second lower yoke. The core in the transformer body is a three-phase three-column structure. The magnetic circuits of the two outer core columns are longer and the magnetic reluctance is larger, while the magnetic circuits of the middle core column are shorter and the magnetic reluctance is smaller. The upper part of the core is the upper yoke, the lower part of the core is the lower yoke, and the middle part consists of three core columns for placing the main coil of the transformer.

[0047] Please refer to Figure 3 and Figure 5 In this embodiment of the invention, optionally, it also includes:

[0048] Insulation layer 8 is respectively disposed between the first balancing winding 4 and the first iron core 22 of the first transformer body 2 and the second iron core 32 of the second transformer body 3, and between the second balancing winding 5 and the first iron core 22 of the first transformer body 2 and the second iron core 32 of the second transformer body 3.

[0049] In this embodiment of the invention, each balancing winding is insulated from the upper and lower yokes of the transformer core using an insulating layer material to prevent short circuits between the balancing winding and the transformer core.

[0050] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0051] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0052] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A transformer balancing winding, characterized in that, include: Transformer body, first transformer core, second transformer core, first balancing winding, second balancing winding, first balancing winding connecting line and second balancing winding connecting line; The first transformer body and the second transformer body are disposed in the transformer body. The first part of the first balancing winding is wound on the first transformer body, the second part of the first balancing winding is wound on the second transformer body, the first part of the second balancing winding is wound on the first transformer body, and the second part of the second balancing winding is wound on the second transformer body. The first part of the first balancing winding and the second part of the first balancing winding are connected by the first balancing winding connecting line, and the first part of the second balancing winding and the second part of the second balancing winding are connected by the second balancing winding connecting line. The first end of the first portion of the first balancing winding is connected to the first end of the second portion of the first balancing winding, the last end of the first portion of the first balancing winding is connected to the last end of the second portion of the first balancing winding, the first end of the first portion of the second balancing winding is connected to the first end of the second portion of the second balancing winding, and the last end of the first portion of the second balancing winding is connected to the last end of the second portion of the second balancing winding, forming a loop between the first portion of the first balancing winding and the second portion of the first balancing winding; The first balancing winding and the second balancing winding have the same number of turns and winding method; The first balancing winding includes: a first end protruding from the first part of the first balancing winding, a first end protruding from the second part of the first balancing winding, a tail end protruding from the first part of the first balancing winding, and a tail end protruding from the second part of the first balancing winding. The second balancing winding includes: a first end protruding from the first part of the second balancing winding, a first end protruding from the second part of the second balancing winding, a tail end protruding from the first part of the second balancing winding, and a tail end protruding from the second part of the second balancing winding.

2. The transformer balancing winding according to claim 1, characterized in that, Also includes: The first transformer body includes: a first iron core, and a first part of the first balancing winding and a first part of the second balancing winding are respectively wound on the first iron core; The second transformer core includes a second iron core, with the second portion of the first balancing winding and the second portion of the second balancing winding respectively wound on the second iron core.

3. The transformer balancing winding according to claim 2, characterized in that, The first iron core and the second iron core have the same size and structure.

4. The transformer balancing winding according to claim 2, characterized in that, The first iron core includes a first upper iron yoke and a first lower iron yoke, and the first part of the first balancing winding and the first part of the second balancing winding are respectively wound on the first upper iron yoke or the first lower iron yoke; The second iron core includes a second upper yoke and a second lower yoke, and the second part of the first balancing winding and the second part of the second balancing winding are respectively wound on the second upper yoke or the second lower yoke.

5. The transformer balancing winding according to claim 4, characterized in that, Also includes: The first transformer body further includes: a first core column, which is disposed between the first upper yoke and the first lower yoke, and a first main coil is placed on the first core column; The second transformer body also includes: a second core column, which is disposed between the second upper yoke and the second lower yoke, and a second main coil is placed on the second core column.

6. The transformer balancing winding according to claim 5, characterized in that, The first core column includes three first sub-core columns, which are respectively arranged between the first upper yoke and the first lower yoke; The second core column includes three second sub-core columns, which are respectively arranged between the second upper yoke and the second lower yoke.

7. The transformer balancing winding according to claim 2, characterized in that, Also includes: An insulating layer is provided between the first balancing winding and the first iron core of the first transformer body and the second iron core of the second transformer body, and between the second balancing winding and the first iron core of the first transformer body and the second iron core of the second transformer body.

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