10kV-level high-frequency transformer

Abstract

The utility model discloses a 10kV-level high-frequency transformer which comprises a magnetic core, a first secondary coil, a second secondary coil, a first primary coil and a second primary coil. The magnetic core comprises two core columns which are arranged in parallel, a first secondary coil and a second secondary coil are sequentially wound on one core column, after the minimum insulation distance a between the primary coil and the secondary coil is confirmed according to the voltage and leakage inductance requirements of a transformer system, the first primary coil is wound on the outer side of the second secondary coil, and the second primary coil is wound on the outer side of the second secondary coil. And the second primary coil is wound on the other core column of the magnetic core. The utility model has the characteristics of small volume, light weight, multiplied leakage inductance value, high stability, good heat dissipation performance and the like.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a 10kV high-frequency transformer. Background Technology

[0002] 10kV transformers are essential components for the power grid's connection to end-user terminals. Most existing transformers rely on oil cooling, which presents challenges for further optimization in terms of size and weight. Furthermore, prolonged exposure to direct sunlight poses a risk of explosion due to increased internal temperature. With the development of switching devices and the widespread use of new materials such as amorphous alloys and nanocrystalline materials, 10kV high-frequency transformers have emerged. While 10kV high-frequency transformers significantly reduce size and weight, the dramatic increase in system voltage and leakage inductance necessitates much higher insulation distances compared to conventional low-voltage high-frequency transformers. Therefore, further optimization of size and weight, and increasing leakage inductance, are urgent issues to address. Simultaneously, as high-frequency products move towards higher current and higher voltage, the power density per unit volume is continuously increasing, requiring structures with better heat dissipation to meet temperature rise requirements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a 10kV high-frequency transformer that is small in size, light in weight, has high leakage inductance, high stability and excellent heat dissipation performance, in order to overcome the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A 10kV high-frequency transformer includes: a magnetic core, a primary winding, a secondary winding, a first primary coil, and a second primary coil; the magnetic core includes two parallel core posts, on which the primary winding and the secondary winding are wound sequentially. After determining the minimum insulation distance 'a' between the primary and secondary windings based on the transformer system voltage and leakage inductance requirements, the first primary winding is wound outside the secondary winding, and the second primary winding is wound on the other core post of the magnetic core.

[0006] As a further improvement of this utility model, heat dissipation components are provided between the first primary coil and the second primary coil and the core post, as well as between the first primary coil and the second primary coil; the heat dissipation components extend along the coil end to the magnetic core end.

[0007] As a further improvement of this utility model, epoxy resin is poured between the heat dissipation component and the second-stage coil and the first primary coil to form an integral whole.

[0008] As a further improvement of this utility model, the heat dissipation component is made of aluminum nitride or boron nitride material.

[0009] As a further improvement of this utility model, the magnetic core is made of ferrite or nanocrystalline material.

[0010] As a further improvement of this utility model, the magnetic core is rectangular, EI-shaped, EE-shaped, or ring-shaped.

[0011] As a further improvement of this utility model, the magnetic core is integrally formed, glued, or clamped.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] 1. The 10kV high-frequency transformer of this invention reduces the coupling between the primary and secondary coils by adjusting their relative positions, resulting in a significant increase in leakage inductance (coefficient > 2). Furthermore, by optimizing the coil structure to consider only the insulation distance between one set of primary and secondary coils, the weight and volume of the transformer core are greatly reduced.

[0014] 2. The 10kV high-frequency transformer of this utility model has significantly improved the heat conduction capacity of the transformer by providing insulating heat dissipation components with high thermal conductivity between the primary and secondary coils and between the coils and the magnetic core, thereby achieving a better heat dissipation effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the coil arrangement structure of a 10kV high-frequency transformer in a specific embodiment of this utility model; in the figure, a represents the minimum insulation distance between the primary coil and the secondary coil;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of a 10kV high-frequency transformer in a specific embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of the overall structure of a 10kV high-frequency transformer in a specific embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the main structural principle of a 10kV high-frequency transformer in a specific embodiment of this utility model;

[0019] Legend: 1. Magnetic core; 2. First primary coil; 3. Second primary coil; 4. First primary coil; 5. Second primary coil; 6. Heat dissipation assembly; 7. Epoxy resin; 8. Core post. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0021] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0023] Example

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the 10kV high-frequency transformer of this utility model includes: a magnetic core 1, a first primary coil 2, a second primary coil 3, a first primary coil 4, and a second primary coil 5. The magnetic core 1 includes two parallel core posts 8, on which the first primary coil 2 and the second primary coil 3 are wound sequentially; as shown... Figure 1 As shown in the shaded area, after confirming the minimum insulation distance 'a' between the primary coil and the secondary coil based on the transformer system voltage and leakage inductance requirements, the first primary coil 4 is wound outside the second secondary coil 3; the second primary coil 5 is wound on another core post 8 of the magnetic core 1.

[0025] In this embodiment, by adjusting the relative positions between the primary and secondary coils, the coupling degree between the primary and secondary coils is reduced, and the leakage inductance is increased exponentially (coefficient > 2). Furthermore, by optimizing the coil structure and considering only the insulation distance between one set of primary and secondary coils, the weight and volume of the transformer core are significantly reduced, with a volume reduction of 10% or more.

[0026] like Figure 2 and Figure 3 As shown, heat dissipation components 6 are provided between the first primary coil 2 and the second primary coil 5 and the core post 8, and between the first primary coil 4 and the second primary coil 3. Figure 3As shown, the heat dissipation component 6 adopts an open structure and extends along the end of the coil to the end of the magnetic core 1, which helps to reduce eddy current losses.

[0027] like Figure 2 As shown, epoxy resin 7 is poured between the heat dissipation component 6 and the secondary coil 3 and the first primary coil 4 to form a whole. In this embodiment, due to factors such as the application environment, the 10kV high-frequency transformer is only made of aluminum alloy at the bottom, and the rest of the direction is made of epoxy resin 7 poured and cured into a whole. The thermal conductivity of epoxy resin 7 is generally around 1.0W / m*K, which is much lower than that of aluminum alloy.

[0028] In this embodiment, the heat dissipation component 6 is made of aluminum nitride, which has a thermal conductivity of 320 W / m*K, thus improving the heat dissipation performance of the transformer. In other embodiments, the heat dissipation component 6 can be made of boron nitride, which has a thermal conductivity of 330 W / m*K and good heat dissipation capabilities.

[0029] In this embodiment, the magnetic core 1 is integrally formed into a rectangular structure using ferrite material. In other embodiments, the magnetic core 1 can also be made of nanocrystalline material, and the magnetic core 1 can also be EI-shaped, EE-shaped, or ring-shaped. The magnetic core can also be formed by adhesive bonding or by clamping with stainless steel bands.

[0030] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A 10kV high-frequency transformer, characterized in that, include: The magnetic core (1), the first primary coil (2), the second primary coil (3), the first primary coil (4), and the second primary coil (5) are provided. The magnetic core (1) includes two parallel core posts (8), on which the first primary coil (2) and the second primary coil (3) are wound in sequence. After the minimum insulation distance a between the primary coil and the secondary coil is confirmed according to the transformer system voltage and leakage inductance requirements, the first primary coil (4) is wound outside the second primary coil (3), and the second primary coil (5) is wound on the other core post (8) of the magnetic core (1).

2. The 10kV high-frequency transformer according to claim 1, characterized in that, Heat dissipation components (6) are provided between the first primary coil (2) and the second primary coil (5) and the core column (8), and between the first primary coil (4) and the second primary coil (3); the heat dissipation components (6) extend along the end of the coil to the end of the magnetic core (1).

3. The 10kV high-frequency transformer according to claim 2, characterized in that, Epoxy resin (7) is poured between the heat dissipation component (6) and the secondary coil (3) and the primary coil (4) to form a whole.

4. The 10kV high-frequency transformer according to claim 3, characterized in that, The heat dissipation component (6) is made of aluminum nitride or boron nitride.

5. The 10kV high-frequency transformer according to any one of claims 1 to 4, characterized in that, The magnetic core (1) is prepared using ferrite or nanocrystalline materials.

6. The 10kV high-frequency transformer according to any one of claims 1 to 4, characterized in that, The magnetic core (1) is rectangular, EI-shaped, EE-shaped, or ring-shaped.

7. The 10kV high-frequency transformer according to any one of claims 1 to 4, characterized in that, The magnetic core (1) is integrally formed, glued, or clamped.

Images