CN109346291B - A kind of winding structure and transformer - Google Patents

Abstract

The invention discloses a winding structure and a transformer. The winding structure includes a first coil, a second coil and a third coil. The second coil is located between the first coil and the third coil and is connected to the first coil and the third coil respectively. connection, the distance between the first coil and the third coil is equal to that of the second coil, the first coil and the third coil are respectively arranged to the second coil at preset intervals, and the adjacent first coil and the adjacent The height difference of the third coil is the first preset threshold. The winding structure in the present invention forms the arrangement area of the first coil, the second coil and the third coil into an isosceles triangle or an isosceles trapezoid, so that the heights of the first coil and the third coil have a certain gradient. To a large extent, the field strength at the end of the winding structure is reduced, which can avoid breakdown of insulating objects in the winding structure, thereby enhancing the electrical performance of the winding structure.

Description

A kind of winding structure and transformer

Technical field

The present invention relates to the technical field of transformers, and in particular to a winding structure and a transformer.

Background technique

Winding, commonly known as coil, is a group of turns that constitute the electrical circuit corresponding to a certain voltage value marked on the transformer. Therefore, the winding is an important part of the transformer, and the transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are high-voltage winding, low-voltage winding and iron core (magnetic core). Different winding structures will produce different electrical properties. Therefore, a reasonable winding structure plays an important role in the safe and reliable operation of transformers and other power electronic devices with this winding structure in the power system.

The traditional winding structure in the current art generally sets the height of each coil to the same height, so that all the coils of the winding are arranged into a rectangular area. Since the vertex angle of the rectangular area is a right angle of 90 degrees, The end of the winding structure is not a smooth transition, so a larger field strength will be distributed around both sides of the 90-degree right angle, which causes the field strength at the end of the winding structure to increase. If there are insulating objects inside the winding, obviously, the Large field strengths can easily penetrate insulating objects.

Contents of the invention

Therefore, the technical problem to be solved by the embodiments of the present invention lies in the winding structure in the prior art. The coils wound in the winding structure are all arranged at the same height to form a rectangular area, which causes the field strength at the end of the winding structure to increase, which easily causes Breakdown of insulating objects in the winding structure occurs.

To this end, embodiments of the present invention provide the following technical solutions:

An embodiment of the present invention provides a winding structure, including a first coil, a second coil and a third coil. The second coil is located between the first coil and the third coil and is connected to the first coil respectively. The coil is connected to the third coil, the distance between the first coil and the third coil is equal to the second coil, and the first coil and the third coil are respectively arranged at preset intervals. The coils are arranged toward the second coil, and the height difference between the adjacent first coil and the adjacent third coil is a first preset threshold.

Optionally, the number of the second coils is at least 1 turn.

Optionally, the numbers of the first coils and the third coils arranged sequentially toward the second coils at preset intervals are equal.

Optionally, the distance between the first coil of the first coil and the third coil sequentially arranged to the second coil at a preset interval and the second coil is a second preset threshold. .

Optionally, a height difference between the first coil and the second coil of the first coil and the third coil sequentially arranged at a preset interval and the second coil is a third predetermined height. Set threshold.

Optionally, the ratio of the second preset threshold to the third preset threshold is 2-2.5.

Optionally, the arrangement area composed of the first coil, the second coil and the third coil is an isosceles trapezoid or an isosceles triangle.

An embodiment of the present invention provides a transformer, including: the winding structure, the winding structure is used as a high-voltage winding of the transformer, and the high-voltage winding is used to output a first voltage;

Low-voltage winding, used to output the second voltage;

An insulating object is located between the high-voltage winding and the low-voltage winding to generate insulation resistance.

Optionally, the distance between the high-voltage winding and the low-voltage winding is 9mm-15mm.

Optionally, the height ratio between the high-voltage winding and the low-voltage winding is 0.8-1.3.

The technical solutions of the embodiments of the present invention have the following advantages:

The invention provides a winding structure and a transformer, wherein the winding structure includes a first coil, a second coil and a third coil. The second coil is located between the first coil and the third coil and is connected to the first coil and the third coil respectively. connection, the distance between the first coil and the third coil is equal to that of the second coil, the first coil and the third coil are respectively arranged to the second coil at preset intervals, and the adjacent first coil and the adjacent The height difference of the third coil is the first preset threshold. The winding structure in the present invention forms the arrangement area of the first coil, the second coil and the third coil into an isosceles triangle or an isosceles trapezoid, so that the heights of the first coil and the third coil have a certain gradient. To a large extent, the field strength at the end of the winding structure is reduced, which can avoid breakdown of insulating objects in the winding structure, thereby enhancing the electrical performance of the winding structure.

Description of the drawings

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a first schematic diagram of the winding structure in an embodiment of the present invention;

Figure 2 is a second schematic diagram of the winding structure in the embodiment of the present invention;

Figure 3 is a schematic structural diagram of a transformer in an embodiment of the present invention.

Reference signs:

1-winding structure; 11-first coil; 12-second coil; 13-third coil;

2-Transformer; 21-High voltage winding; 22-Low voltage winding; 23-Insulating object.

Detailed ways

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 some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by "" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation. Constructed and operated in specific orientations and therefore not to be construed as limitations of the invention. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also be an internal connection between two components; it can be a wireless connection or It's a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

An embodiment of the present invention provides a winding structure 1. As shown in Figure 1, the winding structure 1 includes a first coil 11, a second coil 12 and a third coil 13 respectively.

The second coil 12 is located between the first coil 11 and the third coil 13 and is connected to the first coil 11 and the third coil 13 respectively. In Figure 1, it can be seen that the first coil 11 is located on the left side of the second coil 12, and the third coil 13 is located on the right side of the second coil 12. The height of the second coil 12 is higher than that of the first coil 11 and the third coil 13. The height is high, and the distances between the first coil 11 and the third coil 13 and the second coil 12 are equal. The first coil 11, the second coil 12 and the third coil 13 may respectively represent multi-turn coils. For example: in Figure 1, the first coil 11 can represent coil No. 11 or coil No. 12, and the third coil 13 can represent coil No. 21 or coil No. 22.

In FIG. 1 , the first coil 11 and the third coil 13 are respectively arranged toward the second coil 12 at preset intervals, and the height difference between the adjacent first coil 11 and the adjacent third coil 13 is a preset threshold. That is, in Figure 1, coil No. 11, coil No. 12, coil No. 13, coil No. 14, coil No. 15 and coil No. 21, coil No. 22, coil No. 23, coil No. 24 and coil No. 25 follow the same preset The intervals are arranged toward the second coils 12 in sequence, that is, the intervals between adjacent first coils 11 and adjacent third coils 13 are the same. In FIG. 1 , it can be seen that the height difference between the adjacent first coil 11 and the adjacent third coil 13 is the first preset threshold, that is, the height difference between the adjacent first coil 11 and the adjacent third coil 13 The height differences are equal. In Figure 1, the first preset threshold is Δx.

In the winding structure 1 in the embodiment of the present invention, the number of the second coil 12 may be 1 turn, 2 turns, 3 turns, or other multiple turns. In FIG. 1 , the number of the second coil 12 is one turn. In FIG. 2 , the number of the second coil 12 is multiple turns. When the number of the second coils 12 is multiple turns, the heights of the second coils 12 of each turn are equal, and the intervals between adjacent second coils 12 are also equal.

In the winding structure 1 in the embodiment of the present invention, the number of first coils 11 and third coils 13 arranged sequentially toward the second coil 12 at preset intervals is equal. In FIG. 1 or 2 , the numbers of the first coils 11 and the third coils 13 arranged sequentially toward the second coil 12 at preset intervals are equal, that is, the numbers of the first coils 11 and the third coils 13 sequentially arranged toward the second coil 12 at preset intervals The side length formed by one coil 11 is equal to the side length formed by the third coil 13 arranged sequentially to the second coil 12 at preset intervals. It can be seen from this that in Figure 1, the first coil 11 and the third coil 11 are equal in number. The arrangement area of the three coils 13 and the second coils 12 forms an isosceles triangle. In FIG. 2 , the arrangement area of an equal number of first coils 11 and third coils 13 and a plurality of second coils 12 forms an isosceles trapezoid. It can be seen that compared with the rectangular area, the winding structure 1 forming an isosceles triangle or isosceles trapezoid arrangement area can reduce a certain field intensity distribution to a large extent because the ends of the winding structure 1 are equally distributed, and thus can This prevents a large field intensity from breaking down the insulating objects provided in the winding structure 1, that is, improving the electrical performance of the winding structure 1.

In the winding structure 1 in the embodiment of the present invention, the distance between the first coil 11 and the third coil 13 of the first coil 11 and the third coil 13 arranged sequentially toward the second coil 12 is the second preset distance. threshold. In FIG. 1 or FIG. 2 , the first coil of the first coil 11 is coil No. 11, and the first coil of the third coil 13 is coil No. 21. In Figure 1, the second preset threshold between coil No. 11 or coil 21 and coil No. 31 of the second coil 12 is a, and a can be considered as coil No. 11 or coil 21 of the winding structure 1 and the second coil The horizontal distance between the 12 and 31 coils.

In the winding structure 1 in the embodiment of the present invention, the first coil of the first coil 11 and the third coil 13 are arranged sequentially toward the second coil 12 at preset intervals. The height difference between the first coil and the second coil 12 is the third preset value. Set threshold. In FIG. 1 or FIG. 2 , the first coil of the first coil 11 is coil No. 11, and the first coil of the third coil 13 is coil No. 21. In Figure 1, the difference between the height of coil No. 11 or coil 21 and the height of coil No. 31 of the second coil 12 is b. In Figure 1 or 2, b is the third preset threshold, and b can be considered as The vertical distance between the top of coil No. 11 or coil No. 21 of the winding structure 1 and the top of coil No. 31 of the second coil 12.

In the winding structure 1 in the embodiment of the present invention, the ratio of the second preset threshold to the third preset threshold is 2-2.5, which can optimize the electric field intensity distribution and achieve better electrical performance.

The winding structure 1 in the embodiment of the present invention forms the arrangement area of the first coil 11, the second coil 12 and the third coil 13 into an isosceles triangle or an isosceles trapezoid, so that the first coil 11 and the third coil 13 are arranged according to The preset intervals are arranged sequentially toward the second coil 12 so that the heights of the first coil 11 and the third coil 13 have a certain gradient, which can reduce the field strength at the end of the winding structure 1 to a large extent and avoid The insulating objects in the winding structure 1 undergo breakdown, thereby enhancing the electrical performance of the winding structure 1 .

Example 2

The embodiment of the present invention provides a transformer 2. The transformer 2 is a widely used power electronic device and mainly plays the role of voltage transformation or electrical isolation. For example, a high-frequency transformer mainly plays the role of electrical isolation, voltage transformation and transmission in a flexible substation. The role of power. As shown in Figure 3, the transformer 2 in this embodiment includes:

Including the winding structure 1 in Embodiment 1, the winding structure 1 is used as the high-voltage winding 21 of the transformer 2. The high-voltage winding 21 is used to output the first voltage. The high-voltage winding 21 here is usually the high-voltage side of the transformer 2, so the high-voltage winding 21 outputs The first voltage is high voltage.

The low-voltage winding 22 is used to output the second voltage; the low-voltage winding 22 here is equivalent to the low-voltage side of the transformer 2, so the second point voltage output by the low-voltage winding 22 is low voltage. The low-voltage winding 22 is usually located inside the high-voltage winding 21.

The insulating object 23 is located between the high-voltage winding 21 and the low-voltage winding 22 to generate insulation resistance. The purpose of generating insulation resistance by the insulating object 23 is to isolate the voltage between the high-voltage winding 21 and the low-voltage winding 22 . In the prior art, in order to share the larger field intensity generated between the high-voltage winding 21 and the low-voltage winding 22, a larger insulating object 23 is usually selected. Obviously, the larger insulating object 23 will lead to a larger structure of the transformer 2. , the volume is higher and the cost is higher. Therefore, if the high-voltage winding 21 of the transformer 2 in this embodiment is set to the winding structure 1 in the embodiment 1, the high-voltage winding 21 and the low-voltage winding 22 can be reduced to a large extent. The field strength between them further shortens the distance between the insulating objects 23, reduces the overall size of the transformer, and reduces the manufacturing cost of the transformer.

In the transformer 2 in the embodiment of the present invention, the distance between the high-voltage winding 21 and the low-voltage winding 22 is 9mm-15mm. When the distance between the high-voltage winding 21 and the low-voltage winding 22 is set to 9mm-15mm, the high-voltage winding 21 and the low-voltage winding 22 of the transformer 2 can be made more compact, further reducing the overall volume of the transformer 2 and reducing the manufacturing cost of the transformer 2 cost.

In the transformer 2 in the embodiment of the present invention, the height ratio between the high-voltage winding 21 and the low-voltage winding 22 is 0.8-1.3. In Figure 3, the height of the high-voltage winding 21 is f, the height of the low-voltage winding 22 is e, the height ratio of the high-voltage winding 21 to the low-voltage winding 22 is f/e, and the height ratio of the low-voltage winding 22 to the high-voltage winding 21 is e/f. . f/e or e/f can make the heights of the high-voltage winding 21 and the low-voltage winding 22 of the transformer 2 closer. As a preferred embodiment, when the height ratio between the high-voltage winding 21 and the low-voltage winding 22 is 0.95, it can be made The local field strength of transformer 2 is the smallest, so that the leakage inductance and loss of transformer 2 are smallest.

The transformer 2 in the embodiment of the present invention also includes a first iron core, a second iron core, a first insulating layer and a second insulating layer, wherein the first insulating layer is located between the high-voltage winding 21 and the first iron core. The second insulation layer is located between the low-voltage winding 22 and the second iron core.

In the transformer 2 in the embodiment of the present invention, the high-voltage winding 21 and the low-voltage winding 22 are made of copper foil material, and the number of the high-voltage winding 21 and the low-voltage winding 22 can be set according to user needs.

In summary, the transformer 2 in the embodiment of the present invention can reduce the field strength between the high-voltage winding 21 and the low-voltage winding 22 of the transformer 2 to a great extent by arranging the high-voltage winding 21 into a winding structure 1 with a certain gradient. , to avoid potential safety hazards caused by breakdown of the insulating object 23 between the high-voltage winding 21 and the low-voltage winding 22 due to excessive local field strength. Therefore, the transformer 2 in this embodiment can enhance the electrical insulation performance and service life of the transformer. This allows the transformer 2 to operate safely for a long time.

Obviously, the above-mentioned embodiments are only examples for clear explanation and are not intended to limit the implementation. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. An exhaustive list of all implementations is neither necessary nor possible. The obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims (10)

1. The winding structure comprises a first coil, a second coil and a third coil, wherein the second coil is positioned between the first coil and the third coil and is respectively connected with the first coil and the third coil; the first coil comprises a number 11 coil, a number 12 coil, a number 13 coil, a number 14 coil and a number 15 coil, the third coil comprises a number 21 coil, a number 22 coil, a number 23 coil, a number 24 coil and a number 25 coil, and the second coil comprises a number 31 coil.

2. The winding structure according to claim 1, wherein the number of the second coils is at least 1 turn.

3. The winding structure according to claim 2, wherein the number of the first coils and the number of the third coils which are sequentially arranged to the second coils at a predetermined interval are equal.

4. A winding structure according to claim 3, wherein the distance between the first coil of the first coil and the third coil, which are sequentially arranged to the second coil at a predetermined interval, and the second coil is a second predetermined threshold value, respectively.

5. The winding structure according to claim 4, wherein a difference in height between a first coil of the first coil and a third coil of the third coil, which are sequentially arranged to the second coil at a predetermined interval, and the second coil is a third predetermined threshold.

6. The winding structure according to claim 5, wherein the ratio of the second preset threshold to the third preset threshold is 2-2.5.

7. The winding structure according to any one of claims 1 to 6, wherein an arrangement area of the first coil, the second coil, and the third coil is an isosceles trapezoid or an isosceles triangle.

8. A transformer, comprising:

the winding structure of any one of claims 1-7, being used as a high voltage winding of the transformer for outputting a first voltage;

a low voltage winding for outputting a second voltage;

an insulating object located between the high voltage winding and the low voltage winding for creating an insulation resistance.

9. The transformer of claim 8, wherein a distance between the high voltage winding and the low voltage winding is 9mm-15mm.

10. The transformer of claim 8, wherein a height ratio between the high voltage winding and the low voltage winding is 0.8-1.3.