Low-voltage winding axial air channel structure and gas insulation transformer

Abstract

The utility model relates to a low-voltage winding axial air channel structure and a gas insulation transformer, and belongs to the technical field of transformers, the low-voltage winding axial air channel structure comprises an inner side insulation layer and a winding layer wound on the outer wall of the inner side insulation layer, the winding layer comprises a plurality of coil layers, and a plurality of first supporting strips are evenly arranged between every two adjacent coil layers at intervals; the first supporting strips separate air flow channels between the adjacent coil layers, a plurality of second supporting strips are evenly arranged on the outer wall of the inner side insulating layer at intervals, and the second supporting strips abut against the innermost layer of the winding layer. According to the low-voltage winding, the first supporting strips are uniformly arranged between the adjacent coil layers at intervals, so that the axial airflow channels can be formed, and the airflow channels ensure that gas can circulate without obstruction, so that heat generated in the operation of the winding can be taken away, a relatively good cooling effect is achieved, and the low-voltage winding is located in a relatively low-temperature environment.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a low-voltage winding axial air duct structure and a gas-insulated transformer. Background Art

[0002] A gas-insulated transformer (GIT) is a power transformer that uses SF6 (sulfur hexafluoride) or other suitable gases as insulation and cooling media. Compared to traditional oil-immersed transformers, GITs offer advantages such as fire resistance, environmental friendliness, and simplified maintenance. They are particularly suitable for underground substations, highly polluted environments, or those with limited space.

[0003] Since the thermal conductivity of gaseous media is lower than that of traditional liquid media, which means that gas is not as effective as liquid in heat transfer, our company has redesigned the low-voltage winding structure to maximize heat dissipation efficiency and improve the temperature rise performance of gas-insulated transformer windings. Utility Model Content

[0004] The purpose of this application is to provide a low-voltage winding axial air duct structure and a gas-insulated transformer to improve heat exchange efficiency and ensure temperature control of the transformer during operation.

[0005] To achieve the above objectives, the present application provides a low-voltage winding axial airway structure and a gas-insulated transformer adopting the following technical solutions.

[0006] On the one hand, the present application provides a low-voltage winding axial airway structure, which adopts the following technical solutions;

[0007] A low-voltage winding axial airway structure includes an inner insulating layer and a winding layer wound on the outer wall of the inner insulating layer. The winding layer includes multiple coil layers. A plurality of first struts are evenly spaced between adjacent coil layers. The first struts separate airflow channels between adjacent coil layers. A plurality of second struts are evenly spaced on the outer wall of the inner insulating layer. The second struts abut against the innermost layer of the winding layer.

[0008] The inner insulating layer includes an inner insulating paperboard layer, a middle support rod and an outer insulating paperboard layer, and the second support rod is attached to the outer insulating paperboard layer.

[0009] A plurality of third struts are evenly spaced apart on the surface of the coil layer of the outermost circle of the winding layer, and outer circle insulating paperboard is provided on the surface of the third struts.

[0010] A plurality of pads are evenly arranged at the upper and lower ends of the winding layer, and an insulating cardboard ring is arranged on the side of the pad away from the winding layer, and a ventilation channel is formed between adjacent pads.

[0011] On the other hand, the present application also provides a gas-insulated transformer using the above-mentioned low-voltage winding axial airway structure, which adopts the following technical solution:

[0012] A gas-insulated transformer comprises a shell and an iron core assembly arranged in the shell. The inner insulating layer is sleeved on the surface of the iron core, and a high-voltage winding is also arranged on the surface of the winding layer.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] 1. By evenly spacing the first stays between adjacent coil layers, an axial airflow channel is formed. This channel ensures unimpeded airflow, thereby removing heat generated during winding operation, achieving a better cooling effect and keeping the low-voltage winding in a relatively low-temperature environment.

[0015] 2. Low-voltage windings can be wound continuously without complicated forming or connection processes, which is conducive to improving production efficiency and quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram used to reflect the airway structure in the embodiment of the present application.

[0017] Figure 2 It is a structural schematic diagram used to illustrate the connection relationship between the inner insulation layer and the winding layer in an embodiment of the present application.

[0018] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0019] Figure 4 This is a schematic diagram of the internal structure of a gas-insulated transformer with its casing hidden.

[0020] Explanation of the accompanying drawings: 1. Inner insulation layer; 11. Inner insulating cardboard; 12. Middle support rod; 13. Outer insulating cardboard; 21. Coil layer; 22. First support bar; 23. Air flow channel; 3. Second support bar; 4. Third support bar; 5. Outer ring insulating cardboard; 6. Spacer; 7. Insulating cardboard ring; 8. Core assembly; 9. High-voltage winding. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1-4 This application is described in further detail.

[0022] The present application discloses a low-voltage winding axial airway structure, referring to Figure 1-3, including an inner insulating layer 1 and a winding layer wound on the outer wall of the inner insulating layer 1, the winding layer includes multiple coil layers 21, and a plurality of first struts 22 are evenly spaced between adjacent coil layers 21. The first struts 22 separate the air flow channels 23 between adjacent coil layers 21, and a plurality of second struts 3 are evenly spaced on the outer wall of the inner insulating layer 1. The second struts 3 are in contact with the innermost layer of the winding layer. The inner insulating layer 1 includes an inner insulating paperboard 11, a middle strut 12 and an outer insulating paperboard 13. The second struts 3 are attached to the outer insulating paperboard 13. A plurality of third struts 4 are evenly spaced on the surface of the coil layer 21 of the outermost circle of the winding layer, and an outer circle insulating paperboard 5 is provided on the surface of the third strut 4.

[0023] Reference Figure 1 A number of pads 6 are evenly arranged at the upper and lower ends of the winding layer. An insulating cardboard ring 7 is arranged on the side of the pad 6 away from the winding layer, and a ventilation channel is formed between adjacent pads 6.

[0024] The implementation principle of a low-voltage winding axial airway structure in the embodiment of the present application is as follows:

[0025] By evenly arranging the first struts 22 between adjacent coil layers 21, an axial airflow channel 23 can be formed. The airflow channel 23 ensures that the gas can flow unimpeded, thereby taking away the heat generated during the operation of the winding, thereby achieving a better cooling effect and placing the low-voltage winding in a relatively low-temperature environment.

[0026] The present application also discloses a gas-insulated transformer using the above-mentioned low-voltage winding axial airway structure, referring to Figure 4 , including a shell, an iron core component 8 arranged in the shell, an inner insulating layer 1 sleeved on the surface of the iron core, and a high-voltage winding 9 is also provided on the surface of the winding layer.

[0027] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A low-voltage winding axial airway structure, characterized by: The invention comprises an inner insulating layer (1) and a winding layer wound on the outer wall of the inner insulating layer (1), wherein the winding layer comprises a plurality of coil layers (21), a plurality of first stays (22) are evenly spaced between adjacent coil layers (21), the first stays (22) separate the adjacent coil layers (21) into air flow channels (23), and a plurality of second stays (3) are evenly spaced on the outer wall of the inner insulating layer (1), the second stays (3) abutting against the innermost layer of the winding layer.

2. The low-voltage winding axial airway structure according to claim 1, characterized in that: The inner insulating layer (1) comprises an inner insulating paperboard (11), a middle support rod (12) and an outer insulating paperboard (13), and the second support rod (3) is attached to the outer insulating paperboard (13).

3. The low-voltage winding axial airway structure according to claim 2, characterized in that: A plurality of third struts (4) are evenly spaced on the surface of the coil layer (21) of the outermost circle of the winding layer, and an outer circle insulating paperboard (5) is provided on the surface of the third struts (4).

4. The low-voltage winding axial airway structure according to claim 3, characterized in that: A plurality of pads (6) are evenly arranged at the upper and lower ends of the winding layer, respectively; an insulating cardboard ring (7) is arranged on the side of the pad (6) away from the winding layer, and an air-permeable channel is formed between adjacent pads (6).

5. A gas-insulated transformer using the low-voltage winding axial airway structure according to claim 4, comprising a housing and an iron core assembly (8) disposed within the housing, characterized in that: The inner insulating layer (1) is sleeved on the surface of the iron core, and a high-voltage winding (9) is also provided on the surface of the winding layer.

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