New energy large-capacity three-dimensional wound core device body structure

Abstract

The invention provides a new energy large-capacity three-dimensional wound core device body structure which comprises three winding type iron core columns, the three winding type iron core columns form a triangular three-dimensional structure of a closed magnetic circuit, and the three winding type iron core columns are symmetrically arranged at an angle of 120 degrees; complete symmetry and uniform distribution of magnetic flux of a three-phase magnetic circuit are realized, no-load loss, vibration and noise are effectively reduced, and an optimized magnetic circuit foundation is provided for high-capacity application.

Description

Technical Field

[0001] This invention belongs to the field of power transformer technology, and in particular relates to a three-dimensional wound core structure for a new energy large-capacity transformer. Background Technology

[0002] With the advancement of the "dual carbon" goals, the installed capacity of new energy power generation such as wind and solar power is growing rapidly, placing higher demands on supporting power equipment. Traditional planar laminated core transformers suffer from problems such as high no-load loss, magnetic circuit asymmetry, high noise, and low material utilization, making it difficult to meet the needs of high-efficiency, energy-saving, and compact transformers in new energy scenarios.

[0003] In recent years, three-dimensional wound core transformers have attracted widespread attention due to their advantages such as perfectly symmetrical three-phase magnetic circuits, uniform magnetic flux distribution, low no-load loss, and low noise. However, existing three-dimensional wound core structures still face the following technical bottlenecks when applied to large-capacity applications (such as 10MVA and above): The limited cross-sectional dimensions of the iron core make it difficult to meet the magnetic flux density requirements for large capacities. The space for coil winding is limited, resulting in insufficient heat dissipation. The assembly process of the iron core and coil is complex, and the mechanical strength is insufficient, making it prone to displacement during transportation or short circuit conditions. The overall structure has not been optimized for the grid connection characteristics of new energy sources (such as high harmonic content and large load fluctuations).

[0004] Therefore, there is an urgent need to develop a three-dimensional wound core structure that is structurally sound, performs well, and is suitable for large-capacity new energy applications. Summary of the Invention

[0005] The purpose of this invention is to provide a new energy large-capacity three-dimensional wound iron core transformer body structure to solve the problems of unreasonable magnetic circuit design, weak heat dissipation capacity, poor mechanical stability and insufficient harmonic adaptability in existing large-capacity three-dimensional wound iron core transformers.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention provides a new energy large-capacity three-dimensional wound iron core body structure, including three wound iron core columns. The three wound iron core columns form a triangular three-dimensional structure with a closed magnetic circuit, and the three wound iron core columns are arranged symmetrically at 120°.

[0007] Preferably, each core column is made of multiple layers of continuously wound silicon steel strips with a trapezoidal cross-section.

[0008] Preferably, an insulating support frame is provided between two adjacent core columns, and a cooling air duct is embedded inside the insulating support frame, which is connected to external equipment.

[0009] Preferably, the two ends of the three iron core columns are respectively connected to upper clamps and lower clamps.

[0010] Preferably, each core column has a winding concentrically fitted at both ends.

[0011] Preferably, each winding includes a low-voltage coil and a high-voltage coil, wherein the low-voltage coil is located near the core column and the high-voltage coil is mounted on the low-voltage coil.

[0012] Preferably, multiple heat dissipation channels are provided on the outer surface of each winding, and the multiple heat dissipation channels are arranged circumferentially.

[0013] Preferably, each winding is provided with an elastic clamping device at both ends.

[0014] Preferably, a harmonic suppression shielding layer is provided between the core column and the winding.

[0015] Preferably, the shielding layer comprises a copper foil and a nanocrystalline alloy composite material, wherein the copper foil and the nanocrystalline alloy composite material are alternately stacked.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a new energy large-capacity three-dimensional wound iron core body structure, which forms a closed triangular three-dimensional magnetic circuit by three wound iron core columns arranged symmetrically at 120°. This achieves complete symmetry of the three-phase magnetic circuit and uniform magnetic flux distribution, effectively reducing no-load loss, vibration and noise, and providing an optimized magnetic circuit basis for large-capacity applications.

[0017] Furthermore, by continuously winding trapezoidal cross-section silicon steel strips to form an approximately circular stepped cross-section, the material utilization rate and magnetic flux carrying capacity of the core cross-section are improved, meeting the high magnetic density requirements under large capacity.

[0018] Furthermore, an insulating support frame containing cooling air ducts is installed between the core columns, which enhances the structural support and forms a directional cooling path, significantly improving the overall heat dissipation efficiency.

[0019] Furthermore, by connecting the two ends of the three iron core columns with upper and lower clamps, the integrity and mechanical stability of the device body are enhanced, preventing structural displacement during transportation or short circuits.

[0020] Furthermore, concentric windings are fitted at both ends of each core column, optimizing the spatial layout and electromagnetic coupling efficiency of the windings.

[0021] Furthermore, placing the low-voltage coil on the inside and the high-voltage coil on the outside is beneficial for insulation coordination and electric field distribution optimization.

[0022] Furthermore, circumferential heat dissipation channels are opened on the surface of the winding to improve the heat dissipation conditions of the winding and prevent excessive local temperature rise.

[0023] Furthermore, elastic clamping devices are installed at both ends of the winding to effectively prevent the coil from loosening and improve mechanical reliability and short-circuit resistance.

[0024] Furthermore, a harmonic suppression shielding layer is installed between the core column and the winding to specifically reduce the additional losses and local overheating caused by high-frequency harmonics when new energy is connected to the grid. Detailed Implementation

[0025] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0026] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0027] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0029] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0031] Example 1 This embodiment provides a new energy large-capacity three-dimensional wound iron core body structure, including a three-dimensional triangular closed magnetic circuit composed of three identical wound iron core columns. The three iron core columns are arranged symmetrically at 120°, realizing complete symmetry of the three-phase magnetic circuit and uniform magnetic flux distribution, thereby reducing no-load loss, vibration and noise, and is suitable for new energy large-capacity application scenarios.

[0032] Example 2 Based on Example 1, this example provides a new energy large-capacity three-dimensional wound core structure. Each core column is formed by continuously winding multiple layers of silicon steel strip with a trapezoidal cross-section, creating an approximately circular stepped cross-section. The outer diameter D of the core column satisfies the following:

[0033] Where S is the rated capacity (kVA); Bm is the maximum operating magnetic flux density (T); f is the system frequency (Hz); and k is an empirical coefficient (range 0.85~0.95).

[0034] Example 3 Based on Example 1, this example provides a new energy large-capacity three-dimensional wound iron core body structure, in which an integrally formed insulating support frame is provided between each two adjacent iron core columns. The insulating support frame is made of high mechanical strength composite material and has a cooling air duct embedded inside.

[0035] Example 4 Based on Example 3, this example provides a new energy large-capacity three-dimensional wound iron core body structure, in which a reserved hole is opened at the center of each of the insulating support frames, and the reserved hole is arranged along the axial direction.

[0036] The reserved hole is fitted with a pull screw, and the two ends of the three pull screws are respectively installed on the upper clamp and the lower clamp.

[0037] Example 5 Based on Embodiment 1, this embodiment provides a new energy large-capacity three-dimensional wound iron core body structure, in which a winding is concentrically mounted at both ends of each iron core column, and each winding includes a low-voltage coil and a high-voltage coil, wherein the low-voltage coil is close to the side of the iron core column, and the high-voltage coil is mounted on the low-voltage coil.

[0038] Multiple heat dissipation channels are provided on the outer surface of each winding. These channels are arranged circumferentially and axially.

[0039] In this embodiment, the heat dissipation channel is an oil channel or an air channel.

[0040] Each winding is equipped with a spring clamping device at both ends to prevent the coil from loosening.

[0041] Example 6 Based on Example 1, this example provides a new energy large-capacity three-dimensional wound iron core body structure. A harmonic suppression shielding layer is provided between the iron core column and the winding. The shielding layer is made of alternating layers of high conductivity copper foil and nanocrystalline alloy composite material, which is used to weaken the additional losses caused by high frequency harmonics.

[0042] Example 7 Based on Example 1, this example provides a new energy large-capacity three-dimensional wound iron core body structure. The three-dimensional wound iron core is made of amorphous alloy or high-grade oriented silicon steel material, and the magnetic flux density is designed to be less than 1.65T in order to reduce iron loss and improve overload capacity.

[0043] Example 8 Based on Example 1, this example provides a new energy large-capacity three-dimensional wound iron core body structure, wherein the cooling air duct is connected to an external forced air cooling or oil circulation system to form a directional cooling path, thereby improving the heat dissipation efficiency under large-capacity operating conditions.

[0044] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A new energy large-capacity three-dimensional wound iron core body structure, characterized in that, It includes three wound iron core columns, which form a triangular three-dimensional structure of a closed magnetic circuit, and the three wound iron core columns are arranged symmetrically at 120°.

2. The new energy large-capacity three-dimensional wound iron core body structure according to claim 1, characterized in that, Each core column is made of multiple layers of continuously wound silicon steel strips with a trapezoidal cross-section.

3. The new energy large-capacity three-dimensional wound iron core body structure according to claim 1, characterized in that, An insulating support frame is provided between two adjacent iron core columns. The insulating support frame is embedded with a cooling air duct, which is connected to external equipment.

4. The new energy large-capacity three-dimensional wound iron core body structure according to claim 1, characterized in that, The three iron core columns are connected to upper and lower clamps at their respective ends.

5. The new energy large-capacity three-dimensional wound iron core body structure according to claim 1, characterized in that, Each iron core column has a winding concentrically fitted at both ends.

6. The new energy large-capacity three-dimensional wound iron core body structure according to claim 5, characterized in that, Each winding includes a low-voltage coil and a high-voltage coil, wherein the low-voltage coil is located near the core column and the high-voltage coil is mounted on the low-voltage coil.

7. The new energy large-capacity three-dimensional wound iron core body structure according to claim 5, characterized in that, Multiple heat dissipation channels are provided on the outer surface of each winding, and these channels are arranged circumferentially.

8. The new energy large-capacity three-dimensional wound iron core body structure according to claim 5, characterized in that, Each winding is equipped with an elastic clamping device at both ends.

9. The new energy large-capacity three-dimensional wound iron core body structure according to claim 5, characterized in that, A harmonic suppression shielding layer is provided between the core column and the winding.

10. The new energy large-capacity three-dimensional wound iron core body structure according to claim 9, characterized in that, The shielding layer comprises a copper foil and a nanocrystalline alloy composite material, wherein the copper foil and the nanocrystalline alloy composite material are alternately stacked.