A transformer disc winding pad oil passage structure

Abstract

This utility model relates to a transformer disc winding pad oil channel structure, connected within the conductor of the disc winding. It includes multiple support bars spaced at intervals along the inner circumference of the disc winding. Each support bar has several pads connected along its length, which are inserted into the winding conductor. The winding conductor is located between adjacent pads. Each pad has a tail groove at its inner end on the inner circumference of the winding for insertion and mating with the support bar. A gap is left between the inner wall of the tail groove of each pad on the same support bar and the support bar, forming a pad oil channel. This utility model, by creating a gap in the tail groove of each pad to form a pad oil channel, facilitates heat dissipation in the radial portion of the winding, effectively solving the winding heat dissipation problem during transformer operation.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to an oil passage structure for a transformer disc winding pad. Background Technology

[0002] During transformer operation, the windings are the primary source of losses and temperature rise among all transformer components. This heat must be dissipated; the winding temperature must not reach levels that would degrade the insulation material. If the insulation material is exposed to temperatures exceeding its permissible limits for an extended period, insulation aging will occur, severely impacting the transformer's lifespan.

[0003] In oil-immersed transformers, oil serves as the cooling medium, and heat from the windings is dissipated through oil circulation. The radial pads (inter-pad insulation pads) of the transformer's disc windings cover approximately 30% of the winding surface. Furthermore, the contact between the support bars and the pads in the disc winding is planar, lacking oil channels. This pad coverage renders oil cooling ineffective, resulting in higher temperatures in the radial portion of the winding. Therefore, adding cooling oil channels is necessary. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a transformer disc-type winding pad oil channel structure, which can effectively solve the problem of winding heat dissipation oil channel during transformer operation and improve the reliability of transformer operation.

[0005] This utility model is achieved through the following technical solution: A transformer disc winding pad oil passage structure is provided, which is connected inside the conductor along the disc winding. It includes multiple support bars arranged at intervals along the inner circumference of the disc winding. Each support bar is connected with several pads that are inserted between the winding conductors along the length direction. The winding conductor is between two adjacent pads. Each pad has a tail groove at its inner end on the inner circumference of the winding for insertion and mating with the support bar. The inner wall of the tail groove of each pad on the same support bar is left with a gap from the support bar to form a pad oil passage.

[0006] Furthermore, the length direction of the support bars is consistent with the length direction of the winding, and the support bars are parallel to each other.

[0007] The support bars are arranged along the length of the winding and are spaced parallel to each other on the inner circumference of the winding to ensure uniform flow of internal cooling oil.

[0008] Furthermore, the tail groove is formed by recessing the end face of the inner end of the pad block into the inside of the pad block and having an opening on the end face. The bottom surface of the tail groove facing the opening is set as an arc surface, and the side of the support bar facing the arc surface is a flat surface. The oil passage of the pad block is formed between the arc surface and the flat surface.

[0009] The tail groove has an opening on the inner end face of the pad to facilitate engagement with the support bar. An oil channel is formed between the surface of the support bar and the arc surface of the bottom of the tail groove, allowing the cooling oil to pass through the oil channel to dissipate heat between the support bar and the pad, thus increasing the heat dissipation of the radial part of the winding.

[0010] Furthermore, the cross-section of the support bar is convex, and the two side walls of the tail groove above the arc surface form stepped surfaces that match the shape of the support bar and are symmetrical to each other.

[0011] The cross-section of the support bar is convex, and a stepped surface is formed in the tail groove to fit the support bar. This allows the support bar and the pad to be inserted and locked together, making them less likely to separate and improving the stability of the connection.

[0012] The beneficial effects of this utility model are: The oil channel structure of the transformer disc winding pad block of this utility model is simple and makes full use of the winding body structure. It creatively adds an axial pad block oil channel between the support bar and the pad block, which can effectively solve the problem of winding heat dissipation oil channel during transformer operation to a certain extent, improve the reliability of transformer operation, and does not increase the manufacturing material cost or labor time. It has wide applicability to various disc windings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 for Figure 1 An enlarged schematic diagram of I in the middle.

[0015] Figure 3 This is a schematic diagram of the structure of the pad block in this utility model.

[0016] As shown in the figure: 1. Support bar, 2. Pad block, 3. Wire, 4. Pad block oil passage, 5. Curved surface, 6. Stepped surface, 7. Tail groove, 8. Opening. Detailed Implementation

[0017] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0018] A transformer disc winding pad oil passage structure is connected in the conductor 3 along the disc winding, including multiple support bars 1 arranged at intervals along the inner circumference of the disc winding. The length direction of the support bars 1 is consistent with the length direction of the winding, and the support bars 1 are parallel to each other.

[0019] Several pads 2 are connected along the length of each support bar 1 and inserted between the winding wires 3. The winding wires 3 are between two adjacent pads 2. Each pad 2 has a tail groove 7 at the inner end of the inner circumference of the winding for insertion and mating with the support bar 1. The inner wall of the tail groove 7 of each pad 2 on the same support bar 1 is left with a gap and forms a pad oil passage 4.

[0020] The tail groove 7 is formed by recessing the end face of the inner end of the pad block 2 into the pad block and providing an opening 8 on the end face. The bottom surface of the tail groove 7 facing the opening 8 is set as an arc surface 5. The side of the support bar 1 facing the arc surface 5 is a flat surface. The pad block oil channel 4 is formed between the arc surface 5 and the flat surface.

[0021] The cross-section of the support bar 1 is convex, and the tail groove 7 forms stepped surfaces 6 on both sides above the arc surface 5, which match the shape of the support bar 1 and are symmetrical to each other.

[0022] In use, because the upper surface of the support bar 1 in the radial direction of the winding is a plane, and the pad block 2 has an arc surface 5 with a certain curvature relative to the plane of the support bar 1, the support bar 1 and the pad block 2 are assembled to form a disc-shaped winding axial pad block oil channel 4. The cooling oil can flow through the pad block oil channel 4 and achieve heat dissipation between the support bar 1 and the pad block 2. Compared with the plane contact between the support bar 1 and the pad block 2 in the traditional way, the cooling oil can play a heat dissipation role, solve the heat dissipation temperature of the radial part of the winding, reduce the temperature of the radial part, and improve the heat dissipation effect.

[0023] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A transformer disc winding pad oil passage structure, connected within the conductor along the disc winding, characterized in that: It includes multiple support bars arranged at intervals along the inner circumference of the disc winding. Each support bar has several pads connected along its length and inserted between the winding conductors. The winding conductors are between two adjacent pads. Each pad has a tail groove at its inner end on the inner circumference of the winding for insertion and mating with the support bar. The inner wall of the tail groove of each pad on the same support bar has a gap with the support bar to form a pad oil passage.

2. The transformer disc winding pad oil passage structure according to claim 1, characterized in that: The length direction of the support bars is consistent with the length direction of the winding, and the support bars are parallel to each other.

3. The transformer disc winding pad oil passage structure according to claim 1, characterized in that: The tail groove is formed by recessing the end face of the inner end of the pad block into the inside of the pad block and having an opening on the end face. The bottom surface of the tail groove facing the opening is set as an arc surface, and the side of the support bar facing the arc surface is a flat surface. The oil passage of the pad block is formed between the arc surface and the flat surface.

4. The transformer disc winding pad oil passage structure according to claim 3, characterized in that: The cross-section of the support bar is convex, and the two side walls of the tail groove above the arc surface form stepped surfaces that match the shape of the support bar and are symmetrical to each other.

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