Sealing female flange structure for high-capacity transformer

Abstract

The utility model relates to the field of transformer structures, in particular to a sealing female flange structure for a high-capacity transformer, which comprises a body, a plurality of open holes and a plurality of cutting grooves are uniformly arranged at the edge of the body, the open holes and the cutting grooves are alternately arranged, and each two adjacent open holes are directly provided with one cutting groove. Under the condition that the primary structure of the enclosed bus is not changed, grooving treatment is performed on the flange plate, the cushion block made of the epoxy phenolic glass cloth plate is arranged below the flange, and then the epoxy glue is used for sealing, so that the eddy current loss is reduced, and the overheating risk is reduced.

Description

Technical Field

[0001] The utility model relates to the field of transformer structures, in particular to a sealing bushing flange structure for a large-capacity transformer. Background Technique

[0002] With the increase of the transformer capacity, the current on the low-voltage side of the transformer can be as high as 20 - 30 kA. The large current generates a strong eddy magnetic field and unevenly distributed eddy currents in the metal structural members adjacent to the transformer. These eddy currents will generate induced currents in the nearby metal components, forming various stray eddy current losses. If the design or installation is improper, local overheating is likely to occur, which not only affects the use efficiency and life of the transformer, but also affects the normal and stable operation of the transformer.

[0003] The magnetic flux in the transformer winding includes main magnetic flux and leakage magnetic flux. When the leakage magnetic flux passes through the low-voltage side bushing riser, due to the low magnetic permeability of air, a large amount of leakage magnetic flux passes through the connecting bolts, flanges, etc. with better magnetic conductivity, generating huge eddy currents in the magnetic conductive materials, causing serious heating of the magnetic conductive accessories such as bolts and flange plates, and even turning red. Such local heating problems of large-capacity transformers are technical problems for manufacturers and also problems that trouble operation and maintenance personnel, and are not easy to solve. Content of the Utility Model

[0004] Aiming at the problem of local overheating of large-capacity transformers in the prior art, the utility model provides a sealing bushing flange structure for a large-capacity transformer.

[0005] The utility model is realized through the following technical solutions:

[0006] A sealing bushing flange structure for a large-capacity transformer includes a body. A plurality of openings and a plurality of cutting grooves are evenly arranged at the edge of the body. The openings and the cutting grooves are arranged alternately, and there is a cutting groove directly between two adjacent openings.

[0007] Preferably, the width of the cutting groove is 10 - 15 mm.

[0008] Preferably, the depth of the cutting groove is greater than the width of the low-voltage riser flange.

[0009] Preferably, it further includes a cushion block fixed below the edge of the body.

[0010] Preferably, the cushion block includes an arc-shaped plate and a plurality of strip-shaped plates. The plurality of strip-shaped plates are arranged at intervals along the radial direction of the arc-shaped plate. The strip-shaped plates correspond to the cutting grooves one by one, and the strip-shaped plates are located in the cutting grooves.

[0011] Preferably, an upward baffle is arranged on the outer edge of the arc-shaped plate.

[0012] Preferably, the height of the baffle is the same as the edge thickness of the body.

[0013] Preferably, a sealant is filled between the spacer block and the edge of the body.

[0014] Preferably, the sealant is epoxy glue.

[0015] Preferably, the spacer block is made of epoxy phenolic glass cloth board.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] A sealing bushing flange structure for a large-capacity transformer of the utility model reduces the local heating of the transformer by opening a cutting groove on the flange plate. Considering the actual situation on site and the strength requirements of the flange, it is a solution with the least workload and the least capital investment without changing the primary structure of the enclosed busbar.

[0018] Furthermore, the flange plate is processed by cutting grooves without changing the large structure, which can meet the strength requirements and reduce the local overheating caused by large current at the same time.

[0019] Furthermore, by setting a spacer block sealed with epoxy glue, based on the theory that the magnetic conductivity of air or epoxy material is weaker than that of ferromagnetic material, the magnetic circuit of the flange plate is cut off, thereby reducing the heat generated by the loss of magnetic flux eddy current in the flange plate and preventing the risk of overheating.

[0020] Furthermore, the spacer block made of epoxy phenolic glass cloth board has excellent mechanical properties and temperature resistance, and can maintain good insulation at high temperatures, which is considered optimal comprehensively.

[0021] Furthermore, epoxy glue has good electrical insulation performance, chemical corrosion resistance, heat resistance and bonding performance. Description of the Drawings

[0022] Figure 1 is a schematic diagram of a sealing bushing flange structure for a large-capacity transformer of the utility model;

[0023] Figure 2 is a partial schematic diagram of a sealing bushing flange structure for a large-capacity transformer of the utility model;

[0024] Figure 3 is Figure 2 a schematic diagram of B in

[0025] In the figure, 1, body; 2, cutting groove; 3, spacer block; 4, strip plate; 5, baffle; 6, arc plate. Detailed Embodiment

[0026] The following further elaborates on the utility model with specific embodiments, which is an explanation rather than a limitation of the utility model.

[0027] Embodiment 1

[0028] The utility model discloses a sealing bushing flange structure for a large-capacity transformer. Referring to Figure 1 , it includes a body 1 and a backing plate. A plurality of openings and a plurality of cutting grooves 2 are evenly arranged at the edge of the body 1. The openings and the cutting grooves 2 are arranged alternately, and there is one cutting groove 2 directly between two adjacent openings. The alternating arrangement of the openings and the cutting grooves 2 ensures that the structure can maintain good mechanical strength and heat dissipation performance while reducing weight. One cutting groove 2 is arranged between two adjacent openings, and such a layout helps to disperse stress and increase the stability of the structure.

[0029] Among them, the width of the cutting groove 2 is 10 - 15 mm, and the depth of the cutting groove 2 is greater than the width of the low-voltage riser flange. Limiting the width and depth of the cutting groove 2 is to ensure the use strength of the flange, which is not only convenient for installation and adjustment, but also can effectively prevent stress concentration caused by installation errors and improve the reliability of the overall structure.

[0030] Referring to Figure 2 , 3 , the spacer block 3 is fixed below the edge of the body 1. The spacer block 3 includes an arc-shaped plate 6 and a plurality of strip-shaped plates 4. The plurality of strip-shaped plates 4 are arranged at intervals along the radial direction of the arc-shaped plate 6. The strip-shaped plates 4 correspond to the cutting grooves 2 one by one, and the strip-shaped plates 4 are located in the cutting grooves 2.

[0031] An upward baffle 5 is arranged on the outer edge of the arc-shaped plate 6, and the height of the baffle 5 is the same as the edge thickness of the body 1. The baffle 5 further enhances the connection strength between the spacer block 3 and the body 1 and prevents loosening and misalignment during installation. In this embodiment, the cutting groove 2 divides the edge of the body 1 into several fan-shaped pieces. Two adjacent strip-shaped plates 4, the baffle 5 and the bottom arc-shaped plate 6 form a fan-shaped groove matching with the fan-shaped piece, and the fan-shaped piece is located in the fan-shaped groove, thereby achieving close fitting and effective support.

[0032] A sealing material is filled between the spacer block 3 and the edge of the body 1. The sealing material not only improves the insulation performance of the structure, but also enhances the overall sealing performance and stability. In this embodiment, the sealing material is epoxy glue, and the spacer block 3 is made of epoxy phenolic glass cloth board.

[0033] Embodiment 2

[0034] The difference from Embodiment 1 is that the spacer block 3 is provided in a split form, that is, the spacer block 3 includes a plurality of arc-shaped units that are the same or different. The split setting is convenient for manufacturing the spacer block 3 to prevent the spacer block 3 from being too large and difficult to process. At the same time, it is convenient for personnel to install. Just install them separately. And when the diameter of the flange is large, multiple people can install them at the same time.

[0035] The present utility model helps heat dissipation by setting the layout of the openings and the slots 2, reducing the risk of equipment failure caused by heat accumulation. In addition, through the ingenious design of the slots 2 and the pads 3, the tight fit and effective support between the body 1 and the pads 3 are achieved, improving the stability and reliability of the overall structure. Moreover, insulating materials such as epoxy glue are used as the sealant, and the pads 3 are made of epoxy phenolic glass cloth board with good insulation performance, ensuring the high insulation performance of the transformer. At the same time, by designing the cooperation between the strip board 4 and the slots 2, and the cooperation between the sector pieces and the sector slots, the rapid positioning and rapid installation of the two can be realized, improving the installation efficiency and accuracy.

[0036] The above are only the preferred embodiments of the present utility model, and are not used to limit the technical solutions of the present utility model. Those skilled in the art should understand that, without departing from the spirit and principle of the present utility model, the technical solutions can be subject to several simple modifications and substitutions, and these modifications and substitutions also fall within the protection scope covered by the claims.

Claims

1. A sealing female flange structure for a large-capacity transformer, characterized in that: It comprises a main body (1), wherein a plurality of openings and a plurality of slots (2) are evenly arranged on the edge of the main body (1), the openings and the slots (2) are arranged alternately, and a slot (2) is directly arranged between two adjacent openings.

2. The sealing female flange structure for large-capacity transformer according to claim 1 is characterized in that: The width of the cut groove (2) is 10 to 15 mm.

3. The sealing female flange structure for large-capacity transformer according to claim 1 is characterized in that: The depth of the cut groove (2) is greater than the width of the low-pressure riser seat flange.

4. The sealing female flange structure for large-capacity transformer according to claim 1 is characterized in that: It also includes a cushion block (3) fixed below the edge of the body (1).

5. The sealing female flange structure for large-capacity transformer according to claim 4 is characterized in that: The cushion block (3) comprises an arc-shaped plate (6) and a plurality of strip plates (4). The plurality of strip plates (4) are arranged at intervals along the radial direction of the arc-shaped plate (6). The strip plates (4) correspond to the grooves (2) one by one, and the strip plates (4) are located in the grooves (2).

6. The sealing female flange structure for large-capacity transformer according to claim 5 is characterized in that: An upward baffle (5) is provided on the outer edge of the arc-shaped plate (6).

7. The sealing female flange structure for large-capacity transformer according to claim 6 is characterized in that: The height of the baffle (5) is the same as the edge thickness of the body (1).

8. The sealing female flange structure for large-capacity transformer according to claim 4 is characterized in that: A sealing material is filled between the cushion block (3) and the edge of the body (1).

9. The sealing female flange structure for a large capacity transformer according to claim 8 is characterized in that: The closure is made with epoxy glue.

10. The sealing female flange structure for large capacity transformer according to claim 4, characterized in that: The spacer block (3) is made of epoxy phenolic glass cloth plate.

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