Transformer with built-in magnetic circuit optimization structure

Abstract

The utility model relates to the technical field of transformers, in particular to a transformer with a built-in magnetic circuit optimization structure, which comprises an iron core, an insulating plate, a magnetic shielding component and a clamping piece, the insulating plate is parallel to the side surface of the iron core and is connected with the two side surfaces of the iron core, and the clamping piece comprises an upper clamping piece and a lower clamping piece; the iron core and the insulating plate abut against each other through the upper clamping piece and the lower clamping piece. The number of the magnetic shielding assemblies is two, each magnetic shielding assembly is fixedly connected with the upper clamping piece and the lower clamping piece, and each magnetic shielding assembly abuts against the insulating plate. The utility model has the advantages that the structure is simple and reasonable, the use is convenient, the magnetic flux density of the clamp can be effectively reduced, the loss of the clamp is further reduced, the hot-spot temperature is prevented from being too high, and the service life of the transformer is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a transformer with a built-in magnetic circuit optimization structure. Background Art

[0002] As the State Grid Corporation of China (SGCC) is fully committed to building its power grid, the demand for energy continues to increase. To improve power transmission efficiency, the construction of higher voltage and larger capacity power grids will not only enhance energy efficiency but also reduce carbon emissions, providing strong support for achieving the dual carbon goals. This will also drive my country's power industry towards a cleaner, low-carbon, and sustainable future. The leakage flux generated by high-voltage, high-capacity transformers during operation can form closed loops in the clamps, generating stray losses there, leading to increased clamp temperatures and localized overheating.

[0003] Severe overheating accelerates the aging of transformer oil and insulation components, significantly shortening the transformer's service life. It can even vaporize the transformer oil, causing misoperation of transformer protection devices. Therefore, to address the issue of magnetic flux leakage in high-voltage, high-capacity transformers, a transformer with an optimized internal magnetic circuit structure is needed. Utility Model Content

[0004] In order to address the shortcomings of the existing technology, the utility model provides a transformer with a built-in magnetic circuit optimization structure. A magnetic shielding structure is installed on the clamp to guide the direction of the magnetic flux on the clamp, thereby reducing the magnetic flux density of the clamp. Therefore, the leakage magnetic loss of the clamp can be effectively reduced, and the problem of excessive hot spot temperature caused by leakage magnetic field of the clamp is solved to a great extent.

[0005] The utility model is achieved through the following technical solutions:

[0006] A transformer with a built-in magnetic circuit optimization structure includes an iron core, an insulating plate, a magnetic shielding assembly and a clamp. The insulating plate is parallel to the side of the iron core and connected to the two side surfaces of the iron core. The clamp includes an upper clamp and a lower clamp. The iron core and the insulating plate are abutted together by the upper clamp and the lower clamp. Two magnetic shielding assemblies are provided, each of which is fixedly connected to the upper clamp and the lower clamp respectively, and each magnetic shielding assembly abuts the insulating plate.

[0007] As a further description of the above scheme, each of the magnetic shielding components includes a clamp position magnetic shield, a slot-type shielding plate and a connecting bolt, and the clamp position magnetic shield is arranged in the slot of the slot-type shielding plate; one end of the connecting bolt passes through the slot-type shielding plate and the clamp position magnetic shield in turn, fixing the slot-type shielding plate and the clamp position magnetic shield on the upper clamp or the lower clamp.

[0008] As a further description of the above scheme, each of the slot-type shielding plates includes a bottom plate and a side plate, the bottom plate is parallel to the bottom surface of the upper clamp or the lower clamp, the side plate is parallel to the side surface of the upper clamp or the lower clamp, and the magnetic shielding of the clamp position is placed on the bottom plate.

[0009] As a further description of the above solution, the clamp position magnetic shield is formed by stacking a plurality of silicon steel sheets along the thickness direction, and every two adjacent silicon steel sheets are connected by resin.

[0010] As a further description of the above solution, the closed path of the magnetic lines of force of the transformer with the built-in magnetic circuit optimization structure is: winding, air, magnetic shielding assembly, insulating plate and iron core.

[0011] The utility model has the following beneficial effects:

[0012] The utility model has the advantages of simple structure, easy use and reasonable structure, and can effectively reduce the leakage magnetic density at the clamping piece, thereby greatly reducing the loss caused by the clamping piece, preventing the clamping piece from having a local temperature that is too high, thereby reducing the impact on the insulating medium in the transformer, and achieving the purpose of extending the service life of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 This is a front view of the upper clamping member of an embodiment of the present utility model;

[0015] Figure 2 This is a left side view of the upper clamping member of the embodiment of the present utility model;

[0016] Figure 3 This is a front view of the lower clamping member of an embodiment of the utility model;

[0017] Figure 4 This is a left side view of the lower clamping member of the embodiment of the present utility model;

[0018] Figure 5 A schematic diagram of the closed path of magnetic lines of force for installing a transformer according to an embodiment of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0020] 1- iron core; 2- insulation plate; 3- clamp position magnetic shield; 4- clamp; 5- connecting bolt; 6- slotted shield plate; 7- gasket; 8- winding. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1 As shown, a transformer with a built-in magnetic circuit optimization structure includes an iron core 1, an insulating plate 2, a magnetic shielding assembly and a clamp 4, wherein the insulating plate 2 is parallel to the side of the iron core 1 and connected to the two side surfaces of the iron core 1, wherein the clamp 4 includes an upper clamp and a lower clamp; wherein the iron core 1 and the insulating plate 2 are abutted together by the upper clamp and the lower clamp; wherein two magnetic shielding assemblies are provided, each magnetic shielding assembly is fixedly connected to the upper clamp and the lower clamp respectively, and each magnetic shielding assembly abuts the insulating plate 2. This design has a simple structure, is easy to use, and has a reasonable structure. It can effectively reduce the leakage magnetic density on the clamp 4, thereby reducing the stray loss generated on the clamp 4, preventing the clamp 4 from having a local overtemperature, thereby reducing the impact on the insulating medium in the transformer, and achieving the purpose of extending the service life of the transformer.

[0023] Each magnetic shielding assembly of the embodiment of the present utility model includes a clamp position magnetic shield 3, a slot-shaped shielding plate 6 and a connecting bolt 5, wherein the clamp position magnetic shield 3 is arranged in the slot of the slot-shaped shielding plate 6; wherein one end of the connecting bolt 5 passes through the slot-shaped shielding plate 6 and the clamp position magnetic shield 3 in sequence, fixing the slot-shaped shielding plate 6 and the clamp position magnetic shield 3 on the upper clamp or the lower clamp.

[0024] Each slot-shaped shielding plate 6 of the embodiment of the present invention includes a bottom plate and a side plate, wherein the bottom plate is parallel to the bottom surface of the upper clamp or the lower clamp, wherein the side plate is parallel to the side surface of the upper clamp or the lower clamp, and wherein the clamp position magnetic shield 3 is placed on the bottom plate.

[0025] The clamping position magnetic shield 3 of the embodiment of the present invention is formed by stacking a plurality of silicon steel sheets along the thickness direction, and every two adjacent silicon steel sheets are connected by resin; wherein the slot-shaped shielding plate 6 is also made of silicon steel sheets.

[0026] Specifically, the clamp position magnetic shield 3 is made of stacked rectangular silicon steel sheets, which are connected into a whole by using resin and placed in the slot-shaped shielding plate 6 to fit with it; at the same time, by setting the clamp position magnetic shield 3 of the upper clamp and the clamp position magnetic shield 3 of the lower clamp, the closed path of the magnetic lines of force is guided, which greatly improves the eddy current loss problem.

[0027] The closed path of the magnetic lines of force of the transformer with the built-in magnetic circuit optimization structure in the embodiment of the present invention is: the winding 8, air, the magnetic shielding assembly, the insulating plate 2 and the iron core 1.

[0028] The utility model optimizes the traditional closed path of magnetic lines of force, including the winding 8, the clamp 4 and the iron core 1, to the winding 8, air, the magnetic shielding component, the insulating plate 2 and the iron core 1. The magnetic resistance of the silicon steel sheet and the clamp 4 is calculated by the following formula:

[0029] ;

[0030] ;

[0031] Where: R is the magnetic resistance, L is the magnetic path length, μ is the magnetic permeability, A is the cross section of the magnetic conductor. L Under this condition, the magnetic permeability of the silicon steel sheet is greater than that of the clamp 4, so the magnetic resistance of the silicon steel sheet is smaller than that of the clamp 4, that is, .

[0032] The loss is calculated by the following formula:

[0033] ;

[0034] Where: is the eddy current loss, k is a constant coefficient, B is the magnetic induction intensity, f is the frequency, a is the thickness of the clamp, V is the volume of clamp 4, is the resistivity.

[0035] Since the magnetic resistance of the silicon steel sheet is smaller than that of the clamp 4, the leakage magnetic flux will mainly form a closed loop between the winding 8, air, magnetic shielding assembly, insulating plate 2 and iron core 1, reducing the leakage magnetic flux density of the clamp 4, resulting in a decrease in the magnetic induction intensity of the clamp 4 and a decrease in stray losses, thereby reducing the temperature of the clamp 4.

[0036] The use process of the transformer with built-in magnetic circuit optimization structure according to the embodiment of the utility model is as follows:

[0037] The iron core 1 and the insulating plate 2 are assembled in parallel, and the clamp 4 clamps the iron core 1 and the insulating plate 2 on the outside of the insulating plate 2; the slot-type shielding plate 6 is installed vertically to the iron core 1 and the insulating plate 2 and is fixed to the clamp 4 through a threaded connection with the connecting bolts 5; the magnetic shield 3 at the clamp position is made of stacked silicon steel sheets and is placed in the slot-type shielding plate 6 to fit with it; at the same time, the upper clamp and lower clamp position magnetic shielding structure are adopted. Since the magnetic resistance of the silicon steel sheet is smaller than that of the clamp 4, the leakage magnetic flux will mainly form a closed loop from the winding 8, air, magnetic shielding assembly, insulating plate 2 and iron core 1, reducing the leakage magnetic flux density on the clamp 4, resulting in reduced losses on the clamp 4 and thus reducing the temperature on the clamp 4.

[0038] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0039] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A transformer with a built-in magnetic circuit optimization structure, characterized in that: The invention comprises an iron core (1), an insulating plate (2), a magnetic shielding assembly and a clamp (4), wherein the insulating plate (2) is parallel to the side of the iron core (1) and connected to the two side surfaces of the iron core (1), and the clamp (4) comprises an upper clamp and a lower clamp; the iron core (1) and the insulating plate (2) are abutted together by the upper clamp and the lower clamp; two magnetic shielding assemblies are provided, each of the magnetic shielding assemblies is fixedly connected to the upper clamp and the lower clamp respectively, and each of the magnetic shielding assemblies abuts against the insulating plate (2).

2. The transformer with built-in magnetic circuit optimization structure according to claim 1, characterized in that: Each of the magnetic shielding components comprises a clamping position magnetic shield (3), a slot-shaped shielding plate (6) and a connecting bolt (5); the clamping position magnetic shield (3) is arranged in a slot of the slot-shaped shielding plate (6); one end of the connecting bolt (5) passes through the slot-shaped shielding plate (6) and the clamping position magnetic shield (3) in sequence, fixing the slot-shaped shielding plate (6) and the clamping position magnetic shield (3) on the upper clamp or the lower clamp.

3. The transformer with built-in magnetic circuit optimization structure according to claim 2, characterized in that: Each of the slot-shaped shielding plates (6) comprises a bottom plate and a side plate, wherein the bottom plate is parallel to the bottom surface of the upper clamp or the lower clamp, and the side plate is parallel to the side surface of the upper clamp or the lower clamp, and the clamp position magnetic shield (3) is placed on the bottom plate.

4. The transformer with built-in magnetic circuit optimization structure according to claim 2, characterized in that: The clamping position magnetic shield (3) is formed by stacking a plurality of silicon steel sheets along the thickness direction, and every two adjacent silicon steel sheets are connected by resin.

5. The transformer with built-in magnetic circuit optimization structure according to claim 4, characterized in that: The closed path of the magnetic lines of force of the transformer with the built-in magnetic circuit optimization structure is: winding (8), air, magnetic shielding component, insulating plate (2) and iron core (1).

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