Dry-type transformer with anti-short-circuit low-voltage copper bar fixing structure

Abstract

The utility model discloses a dry-type transformer with an anti-short-circuit low-voltage copper bar fixing structure. The dry-type transformer comprises a transformer main body, and a clamping piece, an inner copper bar and an outer copper bar which are sequentially arranged on the transformer main body. Insulators are arranged between the inner copper bar and the clamping piece and between the inner copper bar and the outer copper bar. According to the utility model, the protruding structure is arranged on the insulator, and the insulating washer is arranged on the bolt used for fixing the insulator, so that on one hand, the relative position of the inner copper bar and the outer copper bar during installation can be limited through the protruding structure, and fixation of the insulator is facilitated. And on the other hand, the bulge structure and the insulating washer play a role in buffering the insulating tube sleeved on the bolt, so that the inner copper bar, the outer copper bar and the bolt in the insulator have two insulating protections.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry-type transformers, and in particular relates to a dry-type transformer with a short-circuit-resistant low-voltage copper busbar fixed structure. Background Art

[0002] like Figure 1 As shown in the figure, the copper busbar fastening structure of a traditional epoxy resin dry-type transformer typically includes a clamp, an insulator, and two spaced copper busbars. The clamp is fixed to the transformer body. After the two copper busbars are installed, the insulator defines their relative position, preventing displacement of the low-voltage coil and thus maintaining the electrical performance of the dry-type transformer.

[0003] In existing technology, low-voltage copper busbars and insulators are typically secured with embedded nuts. Epoxy resin is also used to seal the connection between the embedded nuts and the busbar. However, when an external short circuit occurs and the low voltage generates strong mechanical forces, the epoxy resin coating around the outer ring of the bolts can easily crack and break. If the bolts become loose due to the external force, they can easily come into contact with the busbar, causing a short circuit. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a dry-type transformer with a short-circuit-resistant low-voltage copper busbar fixing structure to solve technical problems such as the bolts fixing the insulators being easily damaged and easily short-circuiting with the copper busbar.

[0005] In order to achieve the above purpose, the specific technical solutions of the present utility model are as follows:

[0006] A dry-type transformer with a short-circuit-resistant low-voltage copper bar fixing structure comprises a transformer body, a clamp, an inner copper bar, and an outer copper bar sequentially arranged on the transformer body. Insulators are provided between the inner copper bar and the clamp, and between the inner copper bar and the outer copper bar.

[0007] Both end faces of the insulator are provided with raised structures. The raised structures are provided with through-holes. The bolts pass through the holes and are locked with nuts. Insulating washers are provided on the inner ends of the bolts and on the inner sides of the nuts.

[0008] Furthermore, two insulating washers are provided at the inner end of the bolt, and one insulating washer is provided at the outer end.

[0009] Furthermore, the protruding structure and the insulator are integrally formed.

[0010] Furthermore, the clamp includes a fixed frame and a connecting frame that are fixedly connected. The fixed frame adopts a U-shaped channel steel and is fixed to the transformer body. The connecting frame is fixed to the fixed frame.

[0011] Furthermore, the connecting frame is a flat plate fixed to the opening of the fixing frame. The limiting hole is provided on the connecting frame.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. This utility model incorporates a raised structure on the insulator and an insulating washer on the bolt used to secure the insulator. This structure, on the one hand, allows the raised structure to define the relative position of the inner and outer copper bars during installation, facilitating insulator securement. On the other hand, the raised structure and insulating washer provide a buffer for the insulating tube fitted over the bolt, providing dual insulation protection for the inner and outer copper bars, as well as the bolt within the insulator.

[0014] 2. The utility model adopts an insulating washer on the inner side of the nut where space is limited; and adopts two insulating washers on the inner end of the bolt where space is ample; thereby effectively spacing the bolt, nut, outer copper bar and inner copper bar, extending the creepage distance and avoiding discharge in a humid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a dry-type transformer in the prior art;

[0016] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the insulator in the utility model.

[0018] Figure numerals: 1. transformer body; 2. clamp; 3. inner copper busbar; 4. outer copper busbar; 5. insulator; 6. bolt; 7. raised structure; 8. insulating washer. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 2As shown, a dry-type transformer with a short-circuit-resistant low-voltage copper busbar fixing structure includes a transformer body 1, and a clamp 2, an inner copper busbar 3 and an outer copper busbar 4 sequentially arranged on one side of the transformer body 1.

[0022] Insulators 5 are installed between the inner copper bar 3 and the clamp 2, and between the inner copper bar 3 and the outer copper bar 4. The insulators 5 are fixed by bolts 6 to define the relative position between the inner copper bar 3 and the outer copper bar 4. At the same time, they can buffer the insulating tubes placed on the bolts 6 when the short-circuit mechanical force is applied.

[0023] Specifically, Figure 2 and 3 As shown, both end faces of the insulator 5 are provided with integrally formed raised structures 7. These raised structures 7 have through-holes. Bolts 6 pass through the holes and are locked with nuts. Insulating washers 8 are provided on the inner ends of the bolts 6 and on the inner side of the nuts.

[0024] In this embodiment, two insulating washers 8 are provided at the inner end of the bolt 6 , and one insulating washer 8 is provided at the outer end.

[0025] like Figure 3 As shown, in this embodiment, the clamp 2 includes a fixed frame and a connecting frame. The fixed frame is a U-shaped channel steel, and the connecting frame is a flat plate. The fixed frame is fixed to the transformer body 1. The connecting frame is fixed to the opening of the fixed frame. The connecting frame has a limit hole.

[0026] Furthermore, the insulator 5 disposed between the inner copper busbar 3 and the clamp 2 has protruding structures 7 at both ends that are respectively inserted into the limiting hole and the copper busbar hole on the inner copper busbar 3 and are locked by bolts 6 .

[0027] During installation, the insulator 5, positioned between the inner and outer copper bars 3 and 4, has its protrusions 7 inserted into the copper bar holes on the inner and outer copper bars 3 and 4, respectively. The insulator 5, positioned between the inner copper bar 3 and the clamp 2, has its protrusions 7 inserted into the stopper holes and the copper bar hole on the inner copper bar 3, respectively. A bolt 6, with two insulating washers 8 at its inner end, passes through the mounting holes in the insulator 5 and is locked with a nut after one insulating washer 8 is inserted.

[0028] The provision of raised structures 7 and insulating washers 8 not only defines the relative position of inner and outer copper bars 3 and 4 during installation, facilitating the securement of insulator 5, but also acts as a buffer for the insulating tubes sleeved over bolts 6, providing dual insulation protection for inner and outer copper bars 3, 4, and the bolts 6 within insulator 5. Furthermore, the provision of multiple insulating washers 8 effectively separates the bolts 6 and nuts from the outer and inner copper bars 4 and 3, extending the creepage distance and preventing discharge in humid environments.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dry-type transformer with a short-circuit-resistant low-voltage copper bar fixing structure, comprising a transformer body (1), and a clamp (2), an inner copper bar (3), and an outer copper bar (4) sequentially arranged on the transformer body (1); insulators (5) are arranged between the inner copper bar (3) and the clamp (2), and between the inner copper bar (3) and the outer copper bar (4), and the insulators (5) are fixed by bolts (6), characterized in that: Both end faces of the insulator (5) are provided with a protruding structure (7); a through-shaped mounting hole is provided on the protruding structure (7); the bolt (6) passes through the mounting hole and is locked by a nut; an insulating washer (8) is provided at the inner end of the bolt (6) and the inner side of the nut.

2. The dry-type transformer with a short-circuit-resistant low-voltage copper busbar fixing structure according to claim 1, characterized in that: The inner end of the bolt (6) is provided with two insulating washers (8), and the outer end is provided with an insulating washer (8).

3. The dry-type transformer with a short-circuit-resistant low-voltage copper busbar fixing structure according to claim 1, characterized in that: The protruding structure (7) and the insulator (5) are integrally formed.

4. The dry-type transformer with a short-circuit-resistant low-voltage copper busbar fixing structure according to claim 1, characterized in that: The clamp (2) comprises a fixed frame and a connecting frame which are fixedly connected; the fixed frame adopts a U-shaped channel steel and is fixed on the transformer body (1); the connecting frame is fixed on the fixed frame.

5. The dry-type transformer with a short-circuit-resistant low-voltage copper busbar fixing structure according to claim 4, characterized in that: The connecting frame is a flat plate and is fixed at the opening of the fixing frame.

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