Transformer winding compression structure with improved short circuit resistance

Abstract

The utility model relates to transformer technical field discloses a kind of transformer winding compression structures of improving anti short-circuit capability, solve the uneven stress and the problem of easy local discharge of existing transformer winding compression structure, it includes transformer winding body, upper compression component and lower compression component, the upper compression component and lower compression component are respectively installed in the top end and bottom end of transformer winding body, the bottom surface of upper compression component and transformer core upper clamp piece is pasted, the bottom end of lower compression component and the top surface of transformer core lower clamp piece are pasted, upper compression component and lower compression component are all by insulating pressing plate, several insulating pressing column, equalizing plate, annular compression ring one, annular compression ring two and annular compression ring three are constituted;Through the transformer winding compression structure, the uniformity of compression force can be improved, the possibility of short circuit occurrence is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, specifically a transformer winding clamping structure to improve short-circuit withstand capability. Background Technology

[0002] Currently, many transformer manufacturers still use spring-loaded nail devices for winding clamping. However, the shortcomings of this method in large-capacity, high-voltage power transformers are becoming increasingly apparent. Spring-loaded nail devices can easily cause uneven stress at certain points in the winding, leading to local short circuits. Furthermore, since spring-loaded nail devices are composed of metal components, their placement in high-field-strength environments is a major challenge. Improper placement can cause partial discharge, and in severe cases, insulation breakdown, resulting in serious consequences. Therefore, this application proposes a transformer winding clamping structure that improves short-circuit withstand capability. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a transformer winding clamping structure that improves short-circuit withstand capability, effectively solving the problems of uneven force distribution and easy partial discharge in the existing transformer winding clamping structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a transformer winding clamping structure for improving short-circuit withstand capability, comprising a transformer winding body, an upper clamping assembly, and a lower clamping assembly, wherein the upper clamping assembly and the lower clamping assembly are respectively installed at the top and bottom ends of the transformer winding body, the upper clamping assembly is in contact with the bottom surface of the upper clamp of the transformer core, and the bottom end of the lower clamping assembly is in contact with the top surface of the lower clamp of the transformer core;

[0005] Both the upper and lower clamping assemblies consist of an insulating pressure plate, several insulating pressure columns, an equalizing plate, and three annular pressure rings. The insulating pressure plate is in contact with the end face of the transformer winding body. The insulating pressure columns are installed at the end of the insulating pressure plate away from the transformer winding body. The equalizing plate is installed at the end of the insulating pressure columns away from the insulating pressure plate. Annular pressure rings one, two, and three are all installed at the end of the equalizing plate away from the insulating pressure columns. Annular pressure ring two is located outside of annular pressure ring one, and annular pressure ring three is located outside of annular pressure ring two.

[0006] Preferably, the transformer winding body is composed of an insulating cylinder, a winding, and several insulating pads. The winding is located on the outer surface of the insulating cylinder, the insulating pads are sandwiched between the windings and are distributed at equal intervals, and the axial positions of the insulating pressure column and the insulating pads correspond one-to-one.

[0007] Preferably, the insulating pressure plate has several limiting grooves at one end near the insulating pressure column, and the equalizing plate has several limiting grooves at one end near the insulating pressure column.

[0008] Preferably, the end of the equalizing plate away from the insulating pressure column is provided with annular groove one, annular groove two and annular groove three, the diameters of annular groove one, annular groove two and annular groove three increase sequentially, and annular pressure ring one, annular pressure ring two and annular pressure ring three are respectively installed inside annular groove one, annular groove two and annular groove three.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] (1) In operation, by setting up an upper clamping assembly and a lower clamping assembly consisting of an insulating pressure plate, several insulating pressure columns, a pressure equalizing plate, an annular pressure ring one, an annular pressure ring two and an annular pressure ring three, the uniformity of the clamping force can be improved, and the winding short circuit can be avoided due to uneven or insufficient clamping force. The insulating pressure plate, several insulating pressure columns and the pressure equalizing plate are all made of insulating material, which can reduce the possibility of partial discharge, thereby avoiding insulation breakdown and improving service life.

[0011] (2) By setting limit groove one and limit groove two, the insulating pressure column can be limited and clamped to prevent the insulating pressure column from shifting or falling off, thus improving stability. By setting annular groove three, annular groove one and annular groove two can limit annular pressure ring one, annular pressure ring two and annular pressure ring three respectively, thus improving the installation stability of annular pressure ring one, annular pressure ring two and annular pressure ring three. Attached Figure Description

[0012] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0013] In the attached diagram:

[0014] Figure 1 This is a schematic diagram of the transformer winding clamping structure for improving short-circuit withstand capability according to this utility model;

[0015] Figure 2 This is a schematic diagram of the connection structure between the transformer winding body and the upper and lower clamping components of this utility model;

[0016] Figure 3 This is an exploded view of the upper clamping component of this utility model;

[0017] Figure 4 This is a schematic diagram of the transformer winding body structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the pressure equalization plate structure of this utility model;

[0019] In the diagram: 1. Transformer winding body; 2. Upper clamping assembly; 3. Lower clamping assembly; 4. Upper clamping piece of transformer core; 5. Lower clamping piece of transformer core; 6. Insulating pressure plate; 7. Insulating pressure column; 8. Equalizing plate; 9. Annular pressure ring one; 10. Annular pressure ring two; 11. Annular pressure ring three; 12. Insulating cylinder; 13. Winding; 14. Insulating pad; 15. Limiting groove one; 16. Limiting groove two; 17. Annular groove one; 18. Annular groove two; 19. Annular groove three. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Depend on Figures 1 to 5 This invention discloses a transformer winding clamping structure for improving short-circuit withstand capability, comprising a transformer winding body 1, an upper clamping assembly 2, and a lower clamping assembly 3. The upper clamping assembly 2 and the lower clamping assembly 3 are respectively installed at the top and bottom ends of the transformer winding body 1. The upper clamping assembly 2 is in contact with the bottom surface of the upper clamping member 4 of the transformer core, and the bottom end of the lower clamping assembly 3 is in contact with the top surface of the lower clamping member 5 of the transformer core. Both the upper clamping assembly 2 and the lower clamping assembly 3 consist of an insulating pressure plate 6, several insulating pressure columns 7, an equalizing plate 8, and an annular pressure ring. The transformer consists of ring 9, ring 2 10, and ring 3 11. The insulating pressure plate 6 is attached to the end face of the transformer winding body 1. The insulating pressure column 7 is installed at the end of the insulating pressure plate 6 away from the transformer winding body 1. The pressure equalizing plate 8 is installed at the end of the insulating pressure column 7 away from the insulating pressure plate 6. Ring 1 9, ring 2 10, and ring 3 11 are all installed at the end of the pressure equalizing plate 8 away from the insulating pressure column 7. Ring 2 10 is located outside of ring 1 9, and ring 3 11 is located outside of ring 2 10.

[0022] During installation, the insulating pressure plate 6 is attached to the end face of the transformer winding body 1. Then, the insulating pressure column 7, the equalizing plate 8, the first annular pressure ring 9, the second annular pressure ring 10, and the third annular pressure ring 11 are installed in sequence. The upper clamping part 4 of the transformer core is attached to the upper clamping assembly 2, and the lower clamping part 5 of the transformer core is attached to the lower clamping assembly 3. During assembly, the upper clamping part 4 and the lower clamping part 5 of the transformer core are locked and fixed by screws and nuts. At this time, pressure is applied to the upper clamping assembly 2 and the lower clamping assembly 3. Since the upper clamping part 4 and the lower clamping part 5 of the transformer core cannot be completely attached to the equalizing plate 8, the uniformity of axial pressure can be improved through the action of the first annular pressure ring 9, the second annular pressure ring 10, and the third annular pressure ring 11, thereby improving the uniformity of force on the equalizing plate 8. Then, the insulating pressure column 7 and the insulating pressure plate 6 are used to apply uniform pressure to the transformer winding body 1, avoiding uneven pressure or pressure loosening that could cause local short circuits.

[0023] The transformer winding body 1 is composed of an insulating cylinder 12, a winding 13 and several insulating pads 14. The winding 13 is located on the outer surface of the insulating cylinder 12. The insulating pads 14 are sandwiched between the windings 13 and are evenly distributed. The axial positions of the insulating pressure column 7 and the insulating pads 14 correspond one-to-one, which can further improve the uniformity of pressure application and avoid deformation of the gap position of the winding 13.

[0024] The insulating pressure plate 6 has several limiting grooves 15 at one end near the insulating pressure column 7, and the equalizing plate 8 has several limiting grooves 16 at one end near the insulating pressure column 7. The equalizing plate 8 has annular grooves 17, 18, and 19 at the end away from the insulating pressure column 7. The diameters of annular grooves 17, 18, and 19 increase sequentially. Annular rings 9, 10, and 11 are respectively installed inside annular grooves 17, 18, and 19. The limiting grooves 15 and 16 can limit the insulating pressure column 7, improving its stability. The annular rings 9, 10, and 11 can limit the annular rings 19, 10, and 11, respectively, improving their stability.

[0025] In operation, by setting up upper and lower clamping components consisting of an insulating pressure plate, several insulating pressure columns, an equalizing plate, and three annular pressure rings, the uniformity of clamping force can be improved, avoiding short circuits in the windings caused by uneven or insufficient clamping force. The insulating pressure plate, several insulating pressure columns, and the equalizing plate are all made of insulating materials, which can reduce the possibility of partial discharge, thereby avoiding insulation breakdown and improving service life. By setting limit grooves one and two, the insulating pressure columns can be limited and clamped, preventing the insulating pressure columns from shifting or falling off, thus improving stability. By setting annular groove three, annular groove one, and annular groove two, the annular pressure rings one, two, and three can be limited respectively, improving the installation stability of annular pressure rings one, two, and three.

Claims

1. A transformer winding clamping structure for improving short-circuit withstand capability, comprising a transformer winding body (1), an upper clamping assembly (2), and a lower clamping assembly (3), characterized in that: The upper clamping assembly (2) and the lower clamping assembly (3) are respectively installed at the top and bottom of the transformer winding body (1). The upper clamping assembly (2) is attached to the bottom surface of the upper clamping member (4) of the transformer core, and the bottom of the lower clamping assembly (3) is attached to the top surface of the lower clamping member (5) of the transformer core. The upper clamping assembly (2) and the lower clamping assembly (3) are both composed of an insulating pressure plate (6), several insulating pressure columns (7), a pressure equalizing plate (8), an annular pressure ring one (9), an annular pressure ring two (10) and an annular pressure ring three (11). The insulating pressure plate (6) is attached to the end face of the transformer winding body (1). The insulating pressure column (7) is installed at the end of the insulating pressure plate (6) away from the transformer winding body (1). The pressure equalizing plate (8) is installed at the end of the insulating pressure column (7) away from the insulating pressure plate (6). The annular pressure ring one (9), the annular pressure ring two (10) and the annular pressure ring three (11) are all installed at the end of the pressure equalizing plate (8) away from the insulating pressure column (7). The annular pressure ring two (10) is located outside the annular pressure ring one (9), and the annular pressure ring three (11) is located outside the annular pressure ring two (10).

2. The transformer winding clamping structure for improving short-circuit withstand capability according to claim 1, characterized in that: The transformer winding body (1) consists of an insulating cylinder (12), a winding (13) and several insulating pads (14). The winding (13) is located on the outer surface of the insulating cylinder (12), and the insulating pads (14) are sandwiched between the windings (13) and distributed at equal intervals.

3. The transformer winding clamping structure for improving short-circuit withstand capability according to claim 2, characterized in that: The axial positions of the insulating pressure column (7) and the insulating pad (14) correspond one-to-one.

4. The transformer winding clamping structure for improving short-circuit withstand capability according to claim 1, characterized in that: The insulating pressure plate (6) has several limiting grooves (15) at one end near the insulating pressure column (7), and the equalizing plate (8) has several limiting grooves (16) at one end near the insulating pressure column (7).

5. A transformer winding clamping structure for improving short-circuit withstand capability according to claim 1, characterized in that: The equalizing plate (8) has annular groove 1 (17), annular groove 2 (18) and annular groove 3 (19) at the end away from the insulating pressure column (7). The diameters of annular groove 1 (17), annular groove 2 (18) and annular groove 3 (19) increase sequentially. Annular pressure ring 1 (9), annular pressure ring 2 (10) and annular pressure ring 3 (11) are respectively installed inside annular groove 1 (17), annular groove 2 (18) and annular groove 3 (19).

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