Dry-type transformer with double-high-voltage structure

Abstract

The utility model discloses a dry-type transformer with a double-high-voltage structure. The dry-type transformer comprises an iron core and a three-phase casting body, the pouring body comprises an inner high-voltage coil and an outer high-voltage coil which are concentrically wound on the outer side of the iron core column; the inner high-voltage coil is of an integrated cylindrical structure and is provided with an inner side high-voltage lead; the two inner side high-voltage leads are respectively led out from the top of the inner high-voltage coil; the outer high-voltage coil surrounds the periphery of the inner high-voltage coil; an outer insulating cylinder is arranged between the inner high-voltage coil and the outer high-voltage coil, and an inner insulating cylinder is arranged between the inner high-voltage coil and the iron core column; the integrated cylindrical inner high-voltage coil is adopted, high-voltage leads are uniformly led out from the top, and the potential safety hazard that a lower lead in a traditional up-down split type structure can be led out only through a long path is avoided; and moreover, the outgoing line path is effectively shortened, the requirement on an additional insulation mechanism is reduced, and the insulation reliability of the transformer is improved.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a dry-type transformer with a dual high-voltage structure. Background Technology

[0002] Dry-type transformers are oil-free insulated transformers primarily used in rail transportation, power systems, new energy, industrial and building power distribution, and other fields. Their main characteristic is that they do not require transformer oil; instead, they rely on air or solid insulating materials such as resin for insulation and heat dissipation, thus offering advantages such as safety, environmental friendliness, and low maintenance costs. Dual-high-voltage dry-type transformers generally refer to dry-type transformers with two high-voltage windings. In existing technology, the internal high-voltage windings of this type of dry-type transformer typically adopt an upper and lower split structure, meaning the high-voltage coils are arranged above and below the transformer core, while the outgoing terminals are led out from different locations. While this design optimizes the spatial arrangement of the windings to some extent, it still presents many challenges in terms of insulation safety, lead arrangement, and manufacturing processes.

[0003] First, the split-type structure results in longer lead paths. The terminals of the lower winding need to travel a longer path to exit from the upper winding, leading to a longer contact distance inside the transformer and reducing insulation reliability. To reduce the interaction between the leads and other windings, additional insulation supports, insulation shields, or air gaps must be added, increasing manufacturing costs and design complexity. Second, due to the split-type design of the internal high-voltage coil, the overall electric field distribution of the transformer is uneven, especially with a large potential difference between windings, leading to increased local electric field strength. Furthermore, this structure also has significant shortcomings in heat dissipation. Uneven temperature distribution between the upper and lower windings hinders the cooling fan's ability to cool the upper winding, easily causing heat accumulation in the upper winding, accelerating insulation aging, and reducing the transformer's long-term operational reliability.

[0004] Therefore, further optimization is needed to address the aforementioned technical problems in the existing technology. Utility Model Content

[0005] Therefore, in order to solve the problems existing in the prior art, the purpose of this utility model is to provide a dry-type transformer with a dual high-voltage structure.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dry-type transformer with a dual high-voltage structure includes a core and a three-phase cast iron body. The core includes a body and core columns, and the cast iron body is provided on the outer periphery of each core column. The cast iron body includes an inner high-voltage coil and an outer high-voltage coil concentrically wound on the outer side of the core column. The inner high-voltage coil is a coaxial, integral cylindrical, double-layer structure with an inner high-voltage lead. Two inner high-voltage leads are respectively led out from the top of the inner high-voltage coil. The outer high-voltage coil is an integral cylindrical structure surrounding the outer periphery of the inner high-voltage coil and has an outer high-voltage lead. The outer high-voltage lead is led out from the top of the outer high-voltage coil. An outer insulating cylinder is provided between the inner high-voltage coil and the outer high-voltage coil, and an inner insulating cylinder is provided between the inner high-voltage coil and the core column.

[0008] Furthermore, the inner high-voltage coil and the outer high-voltage coil each include an integral injection molded part and several layers of coil body; there is a gap between the coil bodies on adjacent sides; the integral injection molded part has multiple heat dissipation channels distributed circumferentially.

[0009] Furthermore, the straight-line distance between the two heat dissipation channels is 5-8 mm.

[0010] Furthermore, the integral injection molded part has an elliptical cross-section; a wiring portion is provided on one or both sides of the integral injection molded part located on the external high voltage coil, and the wiring portion is provided with several terminals from top to bottom.

[0011] Furthermore, the integral injection molded part is prepared using a vacuum casting epoxy resin curing process.

[0012] Furthermore, the transformer also includes a base, an upper clamp, and a lower clamp; the iron core is mounted on the base via the upper clamp and the lower clamp; the upper clamp and the lower clamp are respectively provided with an upper pad and a lower pad; the casting body is fixed between the upper pad and the lower pad.

[0013] Furthermore, the lower clamping member includes a first lower clamping member and a second lower clamping member connected by a tensioning screw; the first lower clamping member and the second lower clamping member are respectively C-shaped plates or [-shaped plates]; the side walls of the first lower clamping member and / or the second lower clamping member are provided with several reinforcing plates.

[0014] Furthermore, the upper clamping member includes a first upper clamping member and a second upper clamping member connected by a tensioning screw; the first upper clamping member and the second upper clamping member are respectively C-shaped plates or [-shaped plates]; the first upper clamping member and the second upper clamping member are respectively provided with a plurality of hanging plates at intervals along their length direction; the hanging plates are provided with lifting holes.

[0015] Furthermore, the upper clamp, lower clamp, and base are all made of steel.

[0016] Compared with the prior art, the beneficial effects of this utility model are at least in the following aspects:

[0017] 1) This utility model adopts an integrated cylindrical inner high-voltage coil, with all high-voltage leads uniformly led out from the top, avoiding the safety hazards of traditional split-type structures where the lower leads must take a long path to emerge. It also effectively shortens the lead path, reduces the need for additional insulation mechanisms, and improves the insulation reliability of the transformer. Furthermore, because the inner coil uses an integrated structure, it avoids temperature gradients and heat dissipation problems between the upper and lower windings, facilitating upward airflow from the cooling fan located below the coil, resulting in more uniform overall heat dissipation. In addition, by adding an air gap between the inner coil and the iron core, thermal convection is enhanced, improving heat dissipation efficiency and extending the service life of the insulation material.

[0018] 2) This utility model adopts an integrated winding design, which reduces the complexity of winding installation and improves production consistency. Furthermore, multiple heat dissipation channels are distributed between the windings to enhance airflow, improve heat dissipation efficiency, avoid local overheating, optimize the heat conduction path, improve the convective heat dissipation effect, effectively reduce the temperature gradient, and improve the heat resistance of the transformer.

[0019] 3) By optimizing the fixing method of the upper and lower clamps and the base, the mechanical strength is enhanced, the shock resistance is improved, the transformer is more stable during operation, and the winding is prevented from shifting due to external force or electromagnetic vibration. This ensures that it will not loosen or deform during long-term operation and is suitable for complex power grid environments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the dual high-voltage dry-type transformer of this utility model;

[0021] Figure 2 This is a partial structural diagram of the inner high-voltage coil of a preferred embodiment of the dual high-voltage dry-type transformer of this utility model;

[0022] Figure 3 This is a partial structural diagram of the external high-voltage coil of a dry-type transformer with a dual high-voltage structure, a preferred embodiment of this utility model.

[0023] Figure 4 This is a partial cross-sectional view of the external high-voltage coil of a dry-type transformer with a dual high-voltage structure, which is a preferred embodiment of this utility model.

[0024] In the picture:

[0025] 1. Iron core; 11. Iron core column; 2. Casting body; 21. Inner high-voltage coil; 211. Inner high-voltage lead; 22. Outer high-voltage coil; 221. Outer high-voltage lead; 23. Integrated injection molded part; 231. Heat dissipation channel; 232. Wiring part; 233. Terminal post; 3. Outer insulating cylinder; 4. Inner insulating cylinder; 5. Base; 6. Upper clamp; 61. First upper clamp; 62. Second upper clamp; 63. Lifting plate; 631. Lifting hole; 7. Lower clamp; 71. First lower clamp; 72. Second lower clamp; 73. Reinforcing plate; 8. Upper pad; 9. Lower pad; 10. Tensioning screw. Detailed Implementation

[0026] To facilitate understanding of this utility model, the technical solution and advantages of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific structure and features of this utility model are illustrated by way of example and should not constitute any limitation on this utility model. Furthermore, any of the technical features mentioned below (including implicit or disclosed features), as well as any technical features directly shown or implied in the figures, can be arbitrarily combined or deleted among these technical features to form other embodiments that may not be directly or indirectly mentioned in this utility model. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0027] In the description of this utility model, unless otherwise stated, all components used are conventional components in the prior art.

[0028] like Figure 1-4 As shown, this utility model provides a dual-high-voltage dry-type transformer, including a core 1 and a three-phase cast iron body 2. The core 1 includes a body and core columns 11, and the cast iron body 2 is provided on the outer periphery of each core column 11. The cast iron body 2 includes an inner high-voltage coil 21 and an outer high-voltage coil 22 concentrically wound on the outside of the core column 11. The inner high-voltage coil 21 is a coaxial, integral cylindrical, double-layer structure and is provided with an inner high-voltage lead 211. Two inner high-voltage leads 211 are respectively led out from the top of the inner high-voltage coil 21. The outer high-voltage coil 22 is also integrally structured and surrounds the inner high-voltage coil 21, and is provided with an outer high-voltage lead 221. The outer high-voltage lead 221 of the gas connector of each phase outer high-voltage coil is led out from the top of the outer high-voltage coil 22, and the outer high-voltage leads of the tail connectors of each phase outer high-voltage coil are interconnected. An outer insulating cylinder 3 is provided between the inner high-voltage coil 21 and the outer high-voltage coil 22, and an inner insulating cylinder 4 is provided between the inner high-voltage coil 21 and the iron core column 11.

[0029] This invention employs an integrated cylindrical high-voltage coil, with all high-voltage leads uniformly led out from the top, avoiding the safety hazards of traditional split-type structures where the lower leads must travel a long path to reach the top. It also effectively shortens the lead path, reduces the need for additional insulation mechanisms, and improves the transformer's insulation reliability. Furthermore, the integrated structure of the inner coil avoids temperature gradients and heat dissipation obstacles between the upper and lower windings, facilitating upward airflow from the cooling fan located below the coil, resulting in more uniform overall heat dissipation.

[0030] Optionally, the inner high-voltage coil 21 and the outer high-voltage coil 22 each include an integral injection-molded part 23 and several layers of coil bodies (not shown in the attached figure); there is a gap between adjacent coil bodies; the integral injection-molded part 23 has multiple heat dissipation channels 231 distributed circumferentially. The straight-line distance between two heat dissipation channels 231 is 5-8mm. By evenly distributing heat dissipation channels circumferentially on the coil bodies of the inner and outer high-voltage coils and controlling the spacing between adjacent heat dissipation channels to 5-8mm, air can circulate fully, effectively improving the heat dissipation efficiency of the transformer, reducing winding temperature rise, avoiding insulation aging problems caused by local overheating, and enhancing overall mechanical strength, so that the winding can remain stable under short-circuit impact or vibration environment, further improving the safety, reliability and long-term overload capacity of the transformer.

[0031] Optionally, the integral injection molded part 23 has an elliptical cross-section and is manufactured using a vacuum casting epoxy resin curing process. A wiring portion 232 is provided on the same side of the integral injection molded part 23 located on the external high-voltage coil; alternatively, wiring portions can be provided on the front and rear sides of the integral injection molded part 23, with the wiring portion forming a vertical plane on the surface of the integral injection molded part. The wiring portion 232 has several terminals 233 arranged from top to bottom. These terminals typically include a starting connector, a ending connector, and a branch connector. When wiring portions are provided on the front and rear sides of the integral injection molded part 23, the starting connector and the ending connector are arranged on the same side of the wiring portion, while the branch connector is arranged on the other side, thereby increasing the electrical safety distance between the connectors and reducing daily maintenance costs and workload.

[0032] The use of an elliptical cross-section integral injection molded part makes the overall coil structure more compact, reducing space occupation while optimizing electric field distribution, reducing local electric field intensity, and improving insulation reliability. At the same time, the connection part is set tangentially on one side of the integral injection molded part, which allows the terminals to be arranged more closely and orderly, shortening the lead length, reducing contact resistance and energy loss, and improving conductivity and electrical connection stability. In addition, the terminals are arranged sequentially from top to bottom, which facilitates installation, inspection and maintenance, reduces the safety hazards caused by wiring intersections, and improves the overall wiring rationality and reliability of the transformer.

[0033] Optionally, the transformer further includes a base 5, an upper clamp 6, and a lower clamp 7; the upper clamp 6, lower clamp 7, and base 5 are all made of steel. The iron core 1 is mounted on the base 5 via the upper clamp 6 and lower clamp 7; the upper clamp 6 and lower clamp 7 are respectively provided with upper pads 8 and lower pads 9; the cast body 2 is fixed between the upper pads 8 and lower pads 9. In this way, by optimizing the fixing method of the upper and lower clamps and the base, the mechanical strength is enhanced, the shock resistance is improved, the transformer is more stable during operation, and the winding misalignment caused by external forces or electromagnetic vibration is prevented, ensuring that loosening or deformation will not occur during long-term operation.

[0034] To be further detailed, the lower clamp 7 includes a first lower clamp 71 and a second lower clamp 72 connected by a tensioning screw 10; the first lower clamp 71 and the second lower clamp 72 are respectively C-shaped plates or [shaped plates]; a plurality of reinforcing plates 73 are provided on the side walls of the first lower clamp 71 and / or the second lower clamp 72.

[0035] Furthermore, the upper clamping member 6 includes a first upper clamping member 61 and a second upper clamping member 62 connected by a tensioning screw 10; the first upper clamping member 61 and the second upper clamping member 62 are respectively C-shaped plates or [shaped plates]; the first upper clamping member 61 and the second upper clamping member 62 are respectively provided with a plurality of hanging plates 63 at intervals along their length direction; the hanging plates 63 are provided with lifting holes 631. In this embodiment, the lower clamp adopts a split structure of a first lower clamp and a second lower clamp, connected by a tensioning screw, making installation and disassembly more convenient. It can also be flexibly adjusted according to different transformer specifications, improving versatility and adaptability. The lower clamp uses a C-shaped plate or [-shaped plate structure] with reinforcing plates on the side walls, effectively enhancing overall rigidity and deformation resistance, ensuring the transformer remains stable under short-circuit impacts, vibrations, or long-term operation, preventing structural loosening or damage. The upper clamp also adopts a split structure, with lifting plates spaced along its length. The lifting plates have lifting holes for easy lifting during installation, transportation, and maintenance, improving operational convenience and safety, and preventing transformer damage or tilting due to uneven lifting forces, thereby enhancing the overall structural stability, durability, and maintenance efficiency.

[0036] It should be noted that this utility model does not involve specific improvements to electrical components such as transformer core material and shape, magnetic circuit design, insulation material formula, temperature protection device, overload protection device, tap changer, and electromagnetic shielding structure. The selection and design of these components can be adjusted according to existing technology or specific application requirements without affecting the innovation and technical contribution of this solution, and will not be elaborated here.

[0037] The above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. For those skilled in the art, it will be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A dual high-voltage construction dry-type transformer, characterized in that, The system includes an iron core and a three-phase casting body. The iron core includes a body and iron core columns, and the casting body is provided on the outer periphery of each iron core column. The casting body includes an inner high-voltage coil and an outer high-voltage coil concentrically wound on the outside of the iron core column. The inner high-voltage coil is an integral cylindrical structure and is provided with an inner high-voltage lead. Two inner high-voltage leads are respectively led out from the top of the inner high-voltage coil. The outer high-voltage coil is an integral cylindrical structure surrounding the outer periphery of the inner high-voltage coil and is provided with an outer high-voltage lead. The outer high-voltage lead is led out from the top of the outer high-voltage coil. An outer insulating cylinder is provided between the inner high-voltage coil and the outer high-voltage coil, and an inner insulating cylinder is provided between the inner high-voltage coil and the iron core column.

2. The dual high-voltage dry-type transformer of claim 1, wherein, The inner high-voltage coil and the outer high-voltage coil each include an integral injection molded part and several layers of coil body; there is a gap between the coil bodies on adjacent sides; the integral injection molded part has multiple heat dissipation channels distributed circumferentially.

3. The dual high-voltage dry-type transformer of claim 2, wherein, The straight-line distance between the two heat dissipation channels is 5-8mm.

4. The dual high-voltage dry-type transformer of claim 3, wherein, The integral injection molded part has an elliptical cross-section; the integral injection molded part located on one or both sides of the external high voltage coil is provided with a wiring part, and the wiring part is provided with a number of terminals from top to bottom.

5. The dual high-voltage dry-type transformer of claim 4, wherein, The integral injection molded part is prepared by vacuum casting epoxy resin curing process.

6. The dual high-voltage dry-type transformer of claim 5, wherein, The transformer also includes a base, an upper clamp, and a lower clamp; the iron core is mounted on the base via the upper clamp and the lower clamp; the upper clamp and the lower clamp are respectively provided with an upper pad and a lower pad; the casting body is fixed between the upper pad and the lower pad.

7. The dual high-voltage dry-type transformer of claim 6, wherein, The lower clamping member includes a first lower clamping member and a second lower clamping member connected by a tensioning screw; the first lower clamping member and the second lower clamping member are respectively C-shaped plates or [shaped plates]; the side walls of the first lower clamping member and / or the second lower clamping member are provided with several reinforcing plates.

8. The dual high-voltage dry-type transformer of claim 7, wherein, The upper clamping component includes a first upper clamping component and a second upper clamping component connected by a tensioning screw; the first upper clamping component and the second upper clamping component are respectively C-shaped plates or [-shaped plates]; the first upper clamping component and the second upper clamping component are respectively provided with a plurality of hanging plates at intervals along their length direction; the hanging plates are provided with lifting holes.

9. The dual high-voltage dry-type transformer of claim 6, wherein, The upper clamp, lower clamp, and base are all made of steel.

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