Transformer coil winding structure and transformer

Abstract

The utility model provides a transformer coil winding structure and a transformer, and relates to the technical field of transformer coils, the transformer coil winding structure comprises a winding structure, a coil lead and an air passage layer, the coil lead penetrates and is wound above the outer side surface of the winding structure to form a plurality of layers of inner coil structures; the coil leads of the aligned rows of coils in the adjacent layers of inner coil structures are integrally connected and are opposite in winding direction, the air channel layer is combined to the outer side face of the outermost layer of inner coil structure, and the coil leads of the last row of coils in the outermost layer of inner coil structure penetrate through the air channel layer and are wound on the outer side face of the air channel to form a plurality of layers of outer coil structures. Each row of coils in each layer of outer coil structure are aligned in the vertical direction, and coil leads of each row of aligned coils in adjacent layers of outer coil structures are integrally connected and are opposite in winding direction. According to the utility model, interlayer voltage and segment voltage of the coil are reduced, lead length and lead resistance loss are reduced, and the leads do not need to be welded.

Description

A transformer coil winding structure and a transformer Technical Field

[0001] This utility model relates to the technical field of transformer coils, and in particular to a transformer coil winding structure and a transformer. Background Technology

[0002] In power systems, transformers, as one of the core devices, undertake the important tasks of voltage transformation and power transmission. Their performance directly affects the stability and reliability of the entire power system. The transformer coil winding structure, as an important component of the transformer, has a crucial impact on the transformer's operating performance due to its rational design.

[0003] Currently, with the continuous development of the power industry, the performance requirements for transformer winding structures are increasing. Users hope that transformers can achieve higher efficiency power transmission at a lower cost to meet the growing power demand. Existing technologies disclose three transformer coil winding structures. The two winding structures shown in Figures 1 and 2, due to the large number of turns in the outer coil and the wide distance between points M and N, result in relatively high voltages at points M and N, easily causing large partial discharges in the coil. Furthermore, the coil start 'a' is located at the top of the coil, and the end 'x' at the bottom, leading to longer coil leads, increasing the cost of copper leads and resulting in greater lead resistance losses. Additionally, the inner coil wires require soldering; if the burrs at the solder joints are not properly treated, they can easily cause large partial discharges. Moreover, the solder joints require insulation, making the process complex and posing safety hazards. The third winding structure shown in Figure 3, due to the large number of turns in the interlayer coil, results in relatively high interlayer voltages. The thicker interlayer insulation material also easily causes large partial discharges in the coil. Furthermore, the thicker interlayer insulation material increases the outer diameter of the coil and the length of the wires, thereby increasing the weight of the wires and resistance losses. Summary of the Invention

[0004] To address the issues of high inter-layer and inter-segment voltages, long lead lengths, lead resistance losses, and the need for lead welding in low-voltage lead structures, this invention proposes a transformer coil winding structure and a transformer that effectively reduces high inter-layer and inter-segment voltages, decreases lead length and lead resistance losses, and allows for integrated lead winding without the need for welding.

[0005] To achieve the above-mentioned technical effects, the technical solution of this utility model is as follows:

[0006] A transformer coil winding structure includes: a winding structure, coil leads, and a vent layer. The coil leads are wound above the outer side of the winding structure to form several layers of inner coil structures. Each inner coil structure has multiple rows of multi-turn coils arranged in parallel. Each row of coils in each inner coil structure is vertically aligned. The coil leads of each row of coils in adjacent inner coil structures are integrally connected and wound in opposite directions. The vent layer is attached to the outer side of the outermost inner coil structure. The coil leads of the last row of coils in the outermost inner coil structure pass through the vent layer. Several layers of outer coil structures are wound on the outer side of the vent layer and extend out from above the outermost inner coil structure. Each outer coil structure has multiple rows of multi-turn coils arranged in parallel. Each row of coils in each outer coil structure is vertically aligned with each row of coils in each inner coil structure. The coil leads of each row of coils in adjacent outer coil structures are integrally connected and wound in opposite directions.

[0007] In this technical solution, firstly, by aligning each row of coils in the vertical direction of each inner coil structure, and connecting the coil leads of each row of coils in adjacent inner coil structures in an integral manner with opposite winding directions, while the outer coil structure adopts the same alignment and winding method as the inner coil structure, the voltage distribution between coil layers and segments can be effectively balanced, reducing local electric field intensity concentration, thereby reducing the risk of insulation breakdown and improving the reliability and safety of transformer operation; secondly, the coil leads are wound above the outer side of the winding structure to form several layers of inner coil structures, and the coil leads of the last row of coils in the outermost inner coil structure... Several layers of outer coil structures are wound around the outer surface of the airway layer and extend out from above the outermost inner coil structure. The coil leads all enter and exit from the same direction, simplifying the coil lead arrangement, reducing lead length and cost, and lowering lead resistance loss. Furthermore, the coil leads of each row of coils aligned in adjacent inner coil structures are integrally connected and wound in opposite directions, and the coil leads of each row of coils aligned in adjacent outer coil structures are integrally connected and wound in opposite directions. Through the integrally connected coil leads, the drawback of traditional structure leads requiring welding is effectively avoided, reducing additional losses caused by welding resistance.

[0008] Preferably, the winding structure is an insulating cylinder, and the outer side of the winding structure is provided with an annular positioning groove that cooperates with the inner coil structure of each layer. The annular positioning groove can realize the precise positioning of the coil lead during winding, ensure that each row of coils in the inner coil structure of each layer is strictly aligned, avoid coil offset or misalignment during winding, improve coil winding accuracy, and thus improve the electromagnetic performance and operational stability of the transformer.

[0009] Preferably, the depth of the annular positioning groove is greater than the thickness of the coil structure in each layer, which can effectively limit the axial and radial movement of the coils in each layer, enhance the fixing effect of the coil structure in each layer, prevent the coils in each layer from deforming or displacing due to vibration or external force, and further improve the positioning reliability of the coils in each layer and the structural stability of the transformer.

[0010] Preferably, the air duct layer includes a first glass fiber mesh, an air duct, and a second glass fiber mesh. The first glass fiber mesh is disposed at the inner end of the air duct layer, and the second glass fiber mesh is disposed at the outer end of the air duct layer. The air duct is disposed between the first glass fiber mesh and the second glass fiber mesh. The air duct layer adopts a double-layer glass fiber mesh sandwiching air duct design, which not only ensures the mechanical strength of the air duct structure, but also promotes air circulation through the air permeability of the glass fiber mesh, enhances the heat dissipation effect, and prevents external impurities from entering the air duct, thus extending the service life of the transformer.

[0011] Preferably, a temperature sensor is embedded in the air duct, and the temperature sensor is electrically connected to an external temperature alarm. The temperature sensor can monitor the coil operating temperature in real time. When the temperature exceeds the safety threshold, the temperature alarm will issue an alarm in time, so that the operator can take measures to prevent insulation damage or equipment failure caused by overheating, thereby improving the operating safety and reliability of the transformer.

[0012] Preferably, the air passage has a honeycomb porous structure. The honeycomb porous structure of the air passage significantly increases the airflow area, improves heat dissipation efficiency, reduces the weight of the air passage, lowers material costs, and enhances the mechanical strength of the air passage, preventing deformation or damage caused by external forces.

[0013] Preferably, the number of turns in each row of coils in each inner coil structure is the same, and the number of turns in each row of coils in each outer coil structure is the same. This ensures the consistency of electromagnetic parameters between each row of coils in each inner coil structure and each row of coils in each outer coil structure, simplifies the winding process, improves production efficiency, and also helps to optimize the electromagnetic performance of the transformer and reduce local overheating or performance fluctuations caused by differences in the number of turns.

[0014] Preferably, interlayer insulation material is provided between adjacent inner coil structures and between adjacent outer coil structures, and the surface of the interlayer insulation material is coated with high-temperature resistant silicone grease. The interlayer insulation material effectively isolates adjacent inner coil structures and adjacent outer coil structures, preventing interlayer short circuits. The coating of the interlayer insulation material with high-temperature resistant silicone grease enhances the heat resistance and lubricity of the interlayer insulation material, reduces insulation damage caused by thermal expansion or mechanical friction, and improves the insulation performance and operational reliability of the transformer.

[0015] Preferably, the coil lead is a copper wire, and the surface of the copper wire is coated with a high-temperature resistant polyesterimide insulation layer. As a coil lead, the copper wire has good conductivity, which reduces resistance loss. The high-temperature resistant polyesterimide insulation layer on the surface of the copper wire effectively isolates the lead from the external environment, preventing insulation breakdown caused by high temperature or electric field, and improving the electrical performance and operational safety of the transformer.

[0016] The present invention also proposes a transformer, including the transformer coil winding structure as described above.

[0017] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0018] This utility model proposes a transformer coil winding structure and a transformer. Firstly, by aligning each row of coils in the vertical direction within each inner coil structure, and connecting the coil leads of each aligned row of coils in adjacent inner coil structures in opposite winding directions, while the outer coil structure adopts the same alignment and winding method as the inner coil structure, the voltage distribution between coil layers and sections can be effectively balanced, reducing local electric field concentration and thus reducing the risk of insulation breakdown, improving the reliability and safety of transformer operation. Secondly, the coil leads are wound above the outer surface of the winding structure to form several layers of inner coil structures, with the last row in the outermost inner coil structure... The coil leads pass through the air passage layer and are wound around the outer surface of the air passage layer to form several layers of outer coil structures. They then exit from above the outermost inner coil structure. The coil leads all enter and exit in the same direction, simplifying the coil lead arrangement, reducing lead length and cost, and lowering lead resistance loss. Furthermore, the coil leads of each row of coils aligned in adjacent inner coil structures are integrally connected and wound in opposite directions. Similarly, the coil leads of each row of coils aligned in adjacent outer coil structures are integrally connected and wound in opposite directions. This integrally connected coil lead effectively avoids the drawbacks of traditional lead structures requiring soldering and reduces additional losses caused by soldering resistance. Attached Figure Description

[0019] Figure 1 shows a schematic diagram of the first type of existing transformer coil winding structure;

[0020] Figure 2 shows a schematic diagram of the second type of existing transformer coil winding structure;

[0021] Figure 3 shows a schematic diagram of the third type of existing transformer coil winding structure;

[0022] Figure 4 shows a main sectional view of a transformer coil winding structure proposed in an embodiment of this utility model;

[0023] Figure 5 shows a top sectional view of a transformer coil winding structure proposed in an embodiment of this utility model;

[0024] Figure 6 shows a main sectional view of the airway layer proposed in the embodiment of this utility model;

[0025] 1. Winding structure; 2. Coil lead; 3. Air passage layer; 31. First glass fiber mesh; 32. Air passage; 33. Second glass fiber mesh; 4. Inner coil structure; 5. Outer coil structure. Detailed Implementation

[0026] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0027] To better illustrate this embodiment, some parts of the accompanying drawings may be omitted, enlarged, or reduced, and do not represent actual dimensions. The descriptions of directions such as "up" and "down" are not intended to limit the scope of this utility model.

[0028] It is understandable to those skilled in the art that some well-known details may be omitted from the accompanying drawings;

[0029] The terms used to describe positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0030] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] As shown in Figures 4 and 5, this embodiment proposes a transformer coil winding structure, including: a winding structure 1, coil leads 2, and an air passage layer 3. The coil leads 2 are wound above the outer side of the winding structure 1 to form a three-layer inner coil structure 4. Each inner coil structure 4 has four rows of parallel multi-turn coils, wherein the first inner coil structure 4 has four rows of parallel coils with 9 turns, the second inner coil structure 4 has four rows of parallel coils with 10 turns, and the third inner coil structure 4 has four rows of parallel coils with 10 turns. Each row of coils in each inner coil structure 4 is aligned vertically, and the coil leads of each aligned row of coils in adjacent inner coil structures 4 are integrally connected and wound in opposite directions. The air passage layer 3 is attached to the outer side of the outermost inner coil structure 4. The coil lead 2 of the last row of coils in coil structure 4 passes through the airway layer 3 and is wound on the outer side of the airway layer 3 to form a three-layer outer coil structure 5, which extends out from above the outermost inner coil structure 4. Each outer coil structure 5 has four rows of multi-turn coils arranged in parallel. The first outer coil structure 5 has 10 turns in the four rows of coils arranged in parallel, the second outer coil structure 5 has 10 turns in the four rows of coils arranged in parallel, and the third outer coil structure 5 has 9 turns in the four rows of coils arranged in parallel. Each row of coils in each outer coil structure 5 is vertically aligned with each row of coils in each inner coil structure 4. The coil leads of each row of coils aligned in adjacent outer coil structures 5 are integrally connected and wound in opposite directions.

[0033] The winding structure 1 is an insulating cylinder. The outer surface of the winding structure 1 is provided with an annular positioning groove that cooperates with the inner coil structure 4 of each layer. The annular positioning groove can realize the precise positioning of the coil lead during winding, ensure that each row of coils in the inner coil structure of each layer is strictly aligned, avoid coil offset or misalignment during winding, improve the coil winding accuracy, and thus improve the electromagnetic performance and operational stability of the transformer.

[0034] The depth of the annular positioning groove is greater than the thickness of the three-layer inner coil structure 4, which can effectively limit the axial and radial movement of the coils in each layer inner coil structure, enhance the fixing effect of each layer inner coil structure, prevent the coils in each layer inner coil structure from deforming or displacing due to vibration or external force, and further improve the positioning reliability of the coils in each layer inner coil structure and the structural stability of the transformer.

[0035] In this embodiment, firstly, by aligning each row of coils in the vertical direction of each inner coil structure, and connecting the coil leads of each aligned row of coils in adjacent inner coil structures in an integral manner with opposite winding directions, while the outer coil structure adopts the same alignment and winding method as the inner coil structure, the voltage distribution between coil layers and segments can be effectively balanced, reducing local electric field intensity concentration, thereby reducing the risk of insulation breakdown and improving the reliability and safety of transformer operation; secondly, the coil leads are wound above the outer side of the winding structure to form a three-layer inner coil structure, and the coil leads of the last row of coils in the outermost inner coil structure pass through the air passage layer, outside the air passage layer. The coil is wound on the side to form a three-layer outer coil structure, and the coil leads pass through from above the outermost inner coil structure. The beginning (a) and end (x) of the coil leads pass through from the same direction, which simplifies the coil lead arrangement, reduces lead length and cost, and reduces lead resistance loss. In addition, the interlayer voltage structure of the lower layers and the intersegment voltage structure of adjacent coil rows can reduce the insulation distance between coil layers and adjacent coil segments in actual product design, which can save insulation material, reduce coil volume, and thus reduce the amount of wire used and the resistance loss of the wire. Due to the reduction in coil volume, the size of the transformer core is reduced accordingly, which can save the weight of the silicon steel sheets in the core and reduce core noise and no-load loss.

[0036] Furthermore, in the coil structure of adjacent layers, the coil leads of each row of coils aligned together are connected in one piece and the winding direction is opposite. In the coil structure of adjacent layers, the coil leads of each row of coils aligned together are connected in one piece and the winding direction is opposite. By connecting the coil leads in one piece, the drawback of the traditional structure leads needing to be soldered is effectively avoided, and the additional loss caused by soldering resistance is reduced.

[0037] Example 2

[0038] Referring to Figures 5 and 6, the air duct layer 3 includes a first glass fiber mesh 31, an air duct 32, and a second glass fiber mesh 33. The first glass fiber mesh 31 is disposed at the inner end of the air duct layer 3, and the second glass fiber mesh 33 is disposed at the outer end of the air duct layer 3. The air duct 32 is disposed between the first glass fiber mesh 31 and the second glass fiber mesh 33. The air duct layer adopts a double-layer glass fiber mesh sandwiching air duct design, which not only ensures the mechanical strength of the air duct structure, but also promotes air circulation through the air permeability of the glass fiber mesh, enhances the heat dissipation effect, and prevents external impurities from entering the air duct, thus extending the service life of the transformer.

[0039] The air duct 32 is embedded with a temperature sensor, which is electrically connected to an external temperature alarm. The temperature sensor can monitor the coil operating temperature in real time. When the temperature exceeds the safety threshold, the temperature alarm will sound an alarm in time, so that the operator can take measures to prevent insulation damage or equipment failure caused by overheating, thereby improving the operating safety and reliability of the transformer.

[0040] The air passage 32 has a honeycomb porous structure. The honeycomb porous structure of the air passage significantly increases the air flow area, improves heat dissipation efficiency, reduces the weight of the air passage, reduces material costs, and enhances the mechanical strength of the air passage, preventing deformation or damage caused by external forces.

[0041] The number of turns in each row of coils in each inner coil structure 4 is the same, and the number of turns in each row of coils in each outer coil structure 5 is the same. This ensures the consistency of electromagnetic parameters of each row of coils in each inner coil structure and each row of coils in each outer coil structure, simplifies the winding process, improves production efficiency, and helps to optimize the electromagnetic performance of the transformer, reducing local overheating or performance fluctuations caused by differences in the number of turns.

[0042] Interlayer insulation material is provided between adjacent inner coil structures 4 and between adjacent outer coil structures 5. The surface of the interlayer insulation material is coated with high-temperature resistant silicone grease, which ensures the consistency of electromagnetic parameters of each row of coils in each inner coil structure and each row of coils in each outer coil structure. This simplifies the winding process, improves production efficiency, and helps optimize the electromagnetic performance of the transformer, reducing local overheating or performance fluctuations caused by differences in the number of turns.

[0043] The coil lead 2 is a copper wire, and the surface of the copper wire is coated with a high-temperature resistant polyesterimide insulation layer. As a coil lead, the copper wire has good conductivity, which reduces resistance loss. The high-temperature resistant polyesterimide insulation layer on the surface of the copper wire effectively isolates the lead from the external environment, preventing insulation breakdown caused by high temperature or electric field, and improving the electrical performance and operational safety of the transformer.

[0044] Example 3

[0045] This embodiment also proposes a transformer, including the transformer coil winding structure as described in the above embodiments, wherein the transformer coil winding structure includes:

[0046] The system comprises a winding structure 1, coil leads 2, and an air passage layer 3. The coil leads 2 are wound above the outer surface of the winding structure 1 to form a three-layer inner coil structure 4. Each inner coil structure 4 has four rows of multi-turn coils arranged in parallel. Each row of coils in each inner coil structure 4 is vertically aligned. The coil leads of each row of coils aligned in adjacent inner coil structures 4 are integrally connected and wound in opposite directions. The air passage layer 3 is attached to the outer surface of the outermost inner coil structure 4. The coil leads 2 of the last row of coils in the outermost inner coil structure 4 pass through the air passage layer 3 and are wound on the outer surface of the air passage layer 3 to form a three-layer outer coil structure 5, which extends from above the outermost inner coil structure 4. Each outer coil structure 5 has four rows of multi-turn coils arranged in parallel. Each row of coils in each outer coil structure 5 is vertically aligned with each row of coils in each inner coil structure 4. The coil leads of each row of coils aligned in adjacent outer coil structures 5 are integrally connected and wound in opposite directions.

[0047] In this embodiment, firstly, by aligning each row of coils in the vertical direction of each inner coil structure, and connecting the coil leads of each aligned row of coils in adjacent inner coil structures in an integral manner with opposite winding directions, while the outer coil structure adopts the same alignment and winding method as the inner coil structure, the voltage distribution between coil layers and segments can be effectively balanced, reducing local electric field intensity concentration, thereby reducing the risk of insulation breakdown and improving the reliability and safety of transformer operation; secondly, the coil leads are wound above the outer side of the winding structure to form a three-layer inner coil structure, and the coil leads of the last row of coils in the outermost inner coil structure pass through the air passage layer, outside the air passage layer. The coil is wound on the side to form a three-layer outer coil structure, and the coil leads pass through from above the outermost inner coil structure. The beginning (a) and end (x) of the coil leads pass through from the same direction, which simplifies the coil lead arrangement, reduces lead length and cost, and reduces lead resistance loss. In addition, the interlayer voltage structure of the lower layers and the intersegment voltage structure of adjacent coil rows can reduce the insulation distance between coil layers and adjacent coil segments in actual product design, which can save insulation material, reduce coil volume, and thus reduce the amount of wire used and the resistance loss of the wire. Due to the reduction in coil volume, the size of the transformer core is reduced accordingly, which can save the weight of the silicon steel sheets in the core and reduce core noise and no-load loss.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A transformer coil winding structure, characterized in that, include: The structure comprises a winding structure (1), coil leads (2), and an airway layer (3). The coil leads (2) are wound above the outer surface of the winding structure (1) to form several layers of inner coil structures (4). Each inner coil structure (4) has multiple rows of parallel multi-turn coils. Each row of coils in each inner coil structure (4) is aligned in the vertical direction. The coil leads of each aligned row of coils in adjacent inner coil structures (4) are integrally connected and wound in opposite directions. The airway layer (3) is attached to the outer surface of the outermost inner coil structure (4). The coil lead (2) of the last row of coils in structure (4) passes through the airway layer (3) and forms several layers of outer coil structure (5) on the outer side of the airway layer (3), and passes out from above the outermost inner coil structure (4). Each outer coil structure (5) has multiple rows of multi-turn coils arranged in parallel. Each row of coils in each outer coil structure (5) is aligned with each row of coils in each inner coil structure (4) in the vertical direction. The coil leads of each row of coils aligned in adjacent outer coil structures (5) are integrally connected and the winding direction is opposite.

2. The transformer coil winding structure according to claim 1, characterized in that, The winding structure (1) is an insulating cylinder, and the outer side of the winding structure (1) is provided with an annular positioning groove that cooperates with each inner coil structure (4).

3. The transformer coil winding structure according to claim 2, characterized in that, The depth of the annular positioning groove is greater than the thickness of the inner coil structure (4) of several layers.

4. The transformer coil winding structure according to claim 1, characterized in that, The airway layer (3) includes a first glass fiber mesh (31), an airway (32), and a second glass fiber mesh (33). The first glass fiber mesh (31) is disposed at the inner end of the airway layer (3), and the second glass fiber mesh (33) is disposed at the outer end of the airway layer (3). The airway (32) is disposed between the first glass fiber mesh (31) and the second glass fiber mesh (33).

5. The transformer coil winding structure according to claim 4, characterized in that, The air passage (32) is embedded with a temperature sensor, which is electrically connected to an external temperature alarm.

6. The transformer coil winding structure according to claim 4, characterized in that, The airway (32) has a honeycomb porous structure.

7. The transformer coil winding structure according to claim 1, characterized in that, The number of turns in each row of coils in each inner coil structure (4) is the same, and the number of turns in each row of coils in each outer coil structure (5) is the same.

8. The transformer coil winding structure according to claim 1, characterized in that, Interlayer insulation material is provided between the adjacent inner coil structures (4) and between the adjacent outer coil structures (5), and the surface of the interlayer insulation material is coated with high-temperature resistant silicone grease.

9. The transformer coil winding structure according to claim 1, characterized in that, The coil lead (2) is a copper wire, and the surface of the copper wire is coated with a high-temperature resistant polyesterimide insulation layer.

10. A transformer, characterized in that, Includes the transformer coil winding structure as described in any one of claims 1-9.

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