A transformer

Abstract

The application discloses a transformer and relates to the technical field of power transmission equipment, which comprises a transformer box, a coil assembly and a magnetic shielding assembly. The transformer box is provided with outwardly protruding arc-shaped parts on both sides in the width direction of the transformer box, and each outwardly protruding arc-shaped part is arranged to face a coil in the coil assembly, so that each coil in the coil assembly is located between two outwardly protruding arc-shaped parts arranged to face the coil. Compared with a traditional rectangularly designed box, the transformer box with the outwardly protruding arc-shaped parts arranged to face the coils has a smaller volume, and the design of the outwardly protruding arc-shaped parts makes the transformer box have better structural strength. Furthermore, the magnetic shielding assembly which is adapted to the structure of the transformer box is detachably mounted on the inner side of the transformer box, so that the magnetic shielding assembly is more convenient to assemble, disassemble and maintain compared with a traditional welding fixing mode. The designed transformer can reduce the volume and size while reducing the loss, and realizes the optimization of technology and economy.

Description

Technical Field

[0001] This application relates to the field of power transmission equipment technology, and more particularly to a transformer. Background Technology

[0002] In recent years, long-distance high-voltage, high-capacity power transmission has become a hot topic in the field of power transmission engineering both domestically and internationally due to its technical and economic advantages. With the construction of new power systems and the development of high-voltage, high-capacity flexible AC / DC transmission technology, transformer equipment used in AC / DC transmission projects is increasingly trending towards characteristics such as large capacity, high voltage, and large size.

[0003] The largest stray loss in a transformer originates from the leakage magnetic field generated by the current in the transformer coils and leads, i.e., leakage magnetic loss. Therefore, magnetic or electrical shielding is commonly used on the transformer tank to suppress leakage magnetic loss. However, simply reducing losses in one method is no longer sufficient for technical and economic optimization, especially for large-capacity, high-voltage, and large-size transformers. How to reduce transformer losses while simultaneously minimizing transformer size and ensuring safe and reliable operation, thus achieving technical and economic optimization, has become an urgent problem to be solved. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a transformer that can reduce transformer losses while reducing volume and transportation size, thereby achieving technical and economic optimization.

[0005] To achieve the above technical objectives, this application provides a transformer, including a transformer housing, a coil assembly, and a magnetic shielding assembly;

[0006] The coil assembly is installed inside the transformer housing;

[0007] The transformer housing has outwardly convex arc-shaped portions on both sides in the width direction;

[0008] The convex arc-shaped portions are arranged facing the coils in the coil assembly in a one-to-one correspondence.

[0009] Each coil in the coil assembly is located between two outwardly convex arc-shaped portions facing itself.

[0010] The magnetic shielding component is adapted to the transformer housing structure and is detachably installed on the inner side of the transformer housing.

[0011] Furthermore, a first connector is provided on the inner side of the transformer housing;

[0012] A second connector is provided on the outer surface of the magnetic shielding component, which can be detachably inserted into the first connector.

[0013] Furthermore, the first connector is arranged along the height direction of the transformer housing, and a slot is provided on the side facing away from the transformer housing.

[0014] The top of the slot extends upward through the first connector to form an insertion port;

[0015] The second connector is arranged along the height direction of the magnetic shielding assembly, and has an insertion part on the side facing away from the magnetic shielding assembly that can be movably inserted into the slot through the insertion port;

[0016] The bottom of the insertion part contacts and abuts against the bottom of the slot, and the side of the insertion part can contact and abut against the side of the slot in the direction away from the transformer box.

[0017] Furthermore, the height of the magnetic shielding component is higher than the height of the coil inside the coil component.

[0018] Furthermore, the magnetic shielding assembly includes a shielding body layer, an electrode layer, and an insulating layer;

[0019] The shielding main layer is formed by stacking multiple shielding sheets along its height direction;

[0020] The electrode layer is laid on the inner side of the shielding main body layer, and the side of the electrode layer facing away from the shielding main body layer is a smooth surface.

[0021] The insulating layer is laid between the shielding body layer and the electrode layer to isolate the shielding body layer from the electrode layer.

[0022] Furthermore, the shielding sheet is a silicon steel sheet.

[0023] Furthermore, the electrode layer is a conductor layer or a semiconductor layer.

[0024] Furthermore, the area of ​​the electrode layer is smaller than the area of ​​the inner side of the shielding body layer.

[0025] Furthermore, the electrode layer is formed by assembling multiple sub-electrode layers.

[0026] Furthermore, the insulating layer is an insulating varnish layer.

[0027] As can be seen from the above technical solutions, the transformer designed in this application has convex arc-shaped portions on both sides of its transformer housing in the width direction, and these convex arc-shaped portions are arranged one-to-one with the coils facing the coil assembly, so that each coil in the coil assembly can be located between the two convex arc-shaped portions facing it. This transformer housing with convex arc-shaped portions corresponding to the coils, while maintaining the insulation safety distance between the magnetic shielding assembly and the coils, can better adapt to the coil shape. Compared with the traditional rectangular design housing, it has a smaller volume, and the design of the convex arc-shaped portions also gives the transformer housing better structural strength. Furthermore, the magnetic shielding assembly adapted to the transformer housing structure can be detachably installed on the inner side of the transformer housing. Compared with the traditional welding fixing method, the detachable installation method makes it easier to install, remove, and maintain the magnetic shielding assembly. In summary, the transformer using this design can reduce losses while reducing volume and transportation size, achieving technical and economic optimization. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a transformer provided in this application;

[0030] Figure 2 This is a partial schematic diagram of a transformer provided in this application;

[0031] Figure 3 This is a schematic diagram of the cooperation structure between the transformer housing and the magnetic shielding assembly of a transformer provided in this application;

[0032] Figure 4 This is a schematic diagram of the structure of the first connector and the second connector of a transformer provided in this application;

[0033] Figure 5 This is a front view of a magnetic shielding assembly for a transformer provided in this application;

[0034] Figure 6 This is a top view of a single shielding sheet of a transformer provided in this application;

[0035] Figure 7 This is a schematic diagram illustrating the interaction between the magnetic shielding component and the coil of a transformer provided in this application.

[0036] Figure 8 This is a partial cross-sectional view of a transformer provided in this application;

[0037] In the figure: 1. Shielding main body layer; 11. Shielding sheet; 12. Second connector; 121. Insertion part; 2. Electrode layer; 3. Insulation layer; 100. Transformer housing; 101. Outwardly convex arc-shaped part; 102. First connector; 1021. Slot; 200. Coil assembly; 201. Coil; 300. Magnetic shielding assembly. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0039] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0041] This application discloses a transformer.

[0042] Please see Figures 1 to 2 One embodiment of a transformer provided in this application includes:

[0043] Transformer housing 100, coil assembly 200 and magnetic shielding assembly 300.

[0044] The coil assembly 200 is installed inside the transformer housing 100. The transformer housing 100 has convex arc-shaped portions 101 on both sides of its width direction. Each convex arc-shaped portion 101 faces the coil 201 in the coil assembly 200. Each coil 201 in the coil assembly 200 is located between two convex arc-shaped portions 101 facing it. The type of coil 201 in the coil assembly 200 of this application can be a cylindrical coil, a square cylindrical coil, an oblong coil, etc., without limitation. The convex arc-shaped portion 101 is a cylindrical arc portion, and its central axis is collinear with the central axis of the coil 201 it faces. The transformer housing 100 with the convex arc-shaped portion 101 corresponding to the coil 201 can better adapt to the shape of the coil 201 while meeting the insulation safety distance between the magnetic shielding component 300 with the matching structure and the coil 201. Compared with the traditional rectangular design housing, it has a smaller volume, and the design of the convex arc-shaped portion 101 also makes the transformer housing 100 have better structural strength.

[0045] The magnetic shielding component 300 is adapted to the structure of the transformer housing 100 and can be detachably installed on the inner side of the transformer housing 100. Compared with the traditional welding fixing method, the detachable installation method makes it more convenient to install, disassemble and maintain the magnetic shielding component 300.

[0046] In summary, the transformer design achieves both reduced losses and smaller size and transport dimensions, thus achieving technical and economic optimization.

[0047] The transformer structure designed in this application is not limited to use in low-frequency transformers, but can also be used in power frequency or high-frequency transformers, including but not limited to oil-immersed transformers, other types of insulated transformers, etc., without limitation.

[0048] The above is a first embodiment of a transformer provided in this application. The following is a second embodiment of a transformer provided in this application. Please refer to the following for details. Figures 1 to 8 .

[0049] Based on the solution of Embodiment 1 above:

[0050] like Figure 3 As shown, a first connector 102 can be provided on the inner side of the transformer housing 100, and a second connector 12 that can be detachably inserted into the first connector 102 can be provided on the outer side of the magnetic shielding assembly 300, so as to realize the quick installation and disassembly between the magnetic shielding assembly 300 and the transformer housing 100.

[0051] like Figure 4As shown, further, the first connector 102 is arranged along the height direction of the transformer housing 100, and a slot 1021 is provided on the side facing away from the transformer housing 100. The top of the slot 1021 extends upward through the first connector 102 to form an insertion port. The second connector 12 is arranged along the height direction of the magnetic shielding assembly 300, and an insertion part 121 is provided on the side facing away from the magnetic shielding assembly 300, which is movable into the slot 1021 through the insertion port. The bottom of the insertion part 121 contacts and abuts against the bottom of the slot 1021, and the side of the insertion part 121 can contact and abut against the side of the slot 1021 in the direction away from the transformer housing 100. The cross-section of the slot 1021 can be an inverted isosceles trapezoid, T-shaped, etc., as long as it can limit the insertion part 121 in the direction away from the transformer housing 100, and there are no restrictions.

[0052] The design of the first connector 102 and the second connector 12 in this application can be hidden between the magnetic shielding component 300 and the transformer housing 100. Compared with the bolt connection method, it will not produce a protrusion on the side of the magnetic shielding component 300 facing the coil 201, thus affecting the shielding effect of the magnetic shielding component 300. In other words, this detachable connection structure design not only makes the installation, disassembly and maintenance of the magnetic shielding component 300 more convenient, but also avoids affecting the shielding effect of the magnetic shielding component 300.

[0053] Furthermore, the height of the magnetic shielding component 300 is preferably designed to be higher than the height of the inner coil 201 of the coil component 200, so as to better ensure the magnetic shielding effect.

[0054] like Figures 5 to 8 As shown, the magnetic shielding assembly 300 further includes a shielding body layer 1, an electrode layer 2, and an insulating layer 3 in terms of its structural design.

[0055] The shielding main layer 1 is formed by stacking multiple shielding sheets 11 in its height direction. This stacking design, that is, the thickness of each shielding sheet 11 after stacking and the height of the shielding main layer 1, can also be understood as stacking the shielding sheets 11 perpendicular to the wall of the transformer box 100 in the vertical direction to obtain the shielding main layer 1 of this design. Through such a stacking design, the magnetic leakage generated by the current in the coil 201 and the lead wire in the transformer can be absorbed more effectively.

[0056] Electrode layer 2 is laid on the inner surface of the shielding main layer 1, and the side of electrode layer 2 facing away from the shielding main layer 1 is a smooth surface. Due to the aforementioned stacking method, unevenness inevitably occurs on the inner surface of the stacked shielding main layer 1, which can lead to uneven electric field during operation. Therefore, by laying electrode layer 2 on the inner surface of the shielding main layer 1, and ensuring that the side of electrode layer 2 facing away from the shielding main layer 1 is smooth, the uneven electric field caused by the uneven area is overcome, thus preventing abnormal discharge phenomena.

[0057] According to the national standard GB6451, the transformer core and other metal parts of the transformer must be reliably grounded. The transformer housing 201 is multi-point grounded, with the shielding layer 1 installed on the inner side of the housing 201 also achieving multi-point grounding through the housing 201, or it can be grounded independently through a corresponding grounding structure. The electrode layer 2 requires a separate grounding structure for reliable single-point grounding. Therefore, if the electrode layer 2 makes conductive contact with the shielding layer 2, multi-point grounding will occur, leading to intermittent breakdown discharge to ground and increased eddy current losses. Therefore, an insulating layer 3 is laid between the shielding layer 1 and the electrode layer 2 to isolate them, preventing the electrode layer 2 from rusting and affecting the shielding layer 1, or vice versa. This also prevents the electrode layer 2 from connecting to the transformer housing 100 through the shielding layer 1 during use, thus avoiding intermittent breakdown discharge to ground and ensuring stable single-point grounding, thereby reducing eddy current losses.

[0058] The magnetic shielding component designed above is a multi-layer shielding structure consisting of a shielding main layer 1, an electrode layer 2, and an insulating layer 3. After three-dimensional simulation analysis and calculation of the structure, it can significantly reduce losses by 50kW to 80kW, thereby further reducing transformer losses.

[0059] Furthermore, the shielding sheet 11 is preferably a silicon steel sheet.

[0060] Furthermore, the electrode layer 2 is preferably a conductor layer or a semiconductor layer. Taking the conductor layer as an example, it can specifically be a copper foil layer, without limitation.

[0061] Furthermore, the larger the area of ​​electrode layer 2, the greater its impact on the magnetic shielding performance of the shielding body layer 1. Conversely, if the area is too small, it will affect the effectiveness of addressing electric field unevenness. Therefore, the electrode layer is arranged on the inner surface of the shielding body layer 1 in an area 1.25 times the minimum distance d from the surface of coil 2. This minimum distance is determined based on the specific arrangement between the shielding body layer 1 and coil 201. Based on this design, the function of electrode layer 2 can be maximized while avoiding excessive impact on the magnetic shielding performance of the shielding body layer 1. It should be noted that the minimum area used to lay the electrode layer 2 has its two side edges parallel to the central axis of the corresponding coil 201, and the distance between the minimum area and the central axis of the coil 201 minus the radius of the coil is 1.25d. Simultaneously, the upper edge of this minimum area is located above the top of the coil 201, and the vertical distance between it and the top of the coil 201 is 1.25d. The lower edge of this minimum area is located below the bottom of the coil 201, and the vertical distance between it and the bottom of the coil 201 is 1.25d. Alternatively, it can be understood that the distance between the side edges of the electrode layer 2 laid on the inner side of the shielding body layer 1 and the central axis of the coil 201 minus the radius of the coil 201 is ≥ 1.25d; the vertical distance from the upper edge of the electrode layer 2 to the top of the coil 201 is ≥ 1.25d; and the vertical distance from the lower edge of the electrode layer 2 to the bottom of the coil 201 is ≥ 1.25d.

[0062] Furthermore, if the area of ​​the electrode layer 2 to be laid is large, it is preferable to design the electrode layer 2 as a combination of multiple sub-electrode layers. An electrode layer 2 with a larger area formed by combining multiple sub-electrode layers has less impact on the shielding main layer 1 compared to a single electrode layer 2 with a larger area. Specifically, the area of ​​a single sub-electrode layer is determined by the conductivity of the electrode layer 2; the higher the conductivity, the smaller the area of ​​a single sub-electrode layer and the greater the number of sub-electrode layers.

[0063] Furthermore, the thickness of electrode layer 2 is determined by its own conductivity. The higher the conductivity, the smaller the corresponding thickness. Specifically, its own thickness should not exceed the penetration depth of the material used at the transformer's operating frequency, so that the magnetic leakage generated by the coil cannot pass through, causing the shielding main layer 1 to fail.

[0064] Furthermore, the insulating layer 3 can be formed by coating with insulating varnish.

[0065] The transformer provided in this application has been described in detail above. For those skilled in the art, there may be changes in the specific implementation and application scope based on the ideas of the embodiments of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A transformer, characterized in that, It includes a transformer housing (100), a coil assembly (200), and a magnetic shielding assembly (300); The coil assembly (200) is installed inside the transformer housing (100); The transformer housing (100) has an outwardly convex arc-shaped part (101) on both sides in the width direction. The convex arc-shaped portion (101) is provided facing the coil (201) in the coil assembly (200); Each coil (201) in the coil assembly (200) is located between two convex arcuate portions (101) facing itself. The magnetic shielding component (300) is adapted to the structure of the transformer housing (100) and is detachably installed on the inner side of the transformer housing (100); The magnetic shielding assembly (300) includes a shielding body layer (1), an electrode layer (2), and an insulating layer (3); The shielding main layer (1) is formed by stacking multiple shielding sheets (11) in its height direction; The electrode layer (2) is laid on the inner side of the shielding main body layer (1), and the side of the electrode layer (2) facing away from the shielding main body layer (1) is a smooth surface; The insulating layer (3) is laid between the shielding body layer (1) and the electrode layer (2) to isolate the shielding body layer (1) from the electrode layer (2).

2. A transformer according to claim 1, characterized in that, The transformer housing (100) is provided with a first plug-in component (102) on its inner side. The magnetic shielding assembly (300) has a second connector (12) that can be detachably inserted into the first connector (102) on its outer surface.

3. A transformer according to claim 2, characterized in that, The first plug-in (102) is arranged along the height direction of the transformer box (100), and a slot (1021) is provided on the side facing away from the transformer box (100). The top of the slot (1021) extends upward through the first connector (102) to form an insertion port; The second plug-in (12) is arranged along the height direction of the magnetic shielding assembly (300), and an insertion part (121) is provided on the side facing away from the magnetic shielding assembly (300) for movably inserting into the slot (1021) through the insertion port. The bottom of the insertion part (121) contacts and abuts against the bottom of the slot (1021), and the side of the insertion part (121) can contact and abut against the side of the slot (1021) in the direction away from the transformer box (100).

4. A transformer according to claim 1, characterized in that, The height of the magnetic shielding assembly (300) is higher than the height of the inner coil (201) of the coil assembly (200).

5. A transformer according to claim 1, characterized in that, The shielding sheet (11) is a silicon steel sheet.

6. A transformer according to claim 1, characterized in that, The electrode layer (2) is a conductor layer or a semiconductor layer.

7. A transformer according to claim 1, characterized in that, The area of ​​the electrode layer (2) is smaller than the area of ​​the inner side of the shielding body layer (1).

8. A transformer according to claim 1, characterized in that, The electrode layer (2) is formed by assembling multiple sub-electrode layers.

9. A transformer according to claim 1, characterized in that, The insulating layer (3) is an insulating varnish layer.

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