A dry-type transformer winding head-to-tail insulation processing structure

Abstract

The utility model provides a kind of dry-type transformer winding head-end head insulation processing structure, including low-voltage winding, the low-voltage winding voltage is greater than 6kV above, including conductor copper wire, interlayer insulation layer and the head-end lead and tail-end lead of low-voltage winding, wherein, interlayer insulation layer and conductor copper wire are wound into low-voltage winding using layer structure, low-voltage winding upper and lower ends are equipped with winding end insulation layer, head-end lead and tail-end lead are led out from low-voltage winding top, and the root of head-end lead and tail-end lead is covered with composite insulation boss. Through the technical scheme of the utility model, the dry-type transformer winding head-end head insulation processing structure, when transformer assembly, since lead portion is added package processing technology when winding is wound, thermoplastic insulation tube can be better wrapped to the root of winding head-end head lead, so that its winding end surface and thermoplastic insulation tube form an entirety, improve the insulation performance of transformer.

Description

Technical Field

[0001] This utility model relates to the technical field of dry-type transformer equipment, and more specifically, to an insulation treatment structure for the beginning and end of a dry-type transformer winding. Background Technology

[0002] Currently, epoxy resin dry-type transformers are widely used due to their excellent properties. Improving product performance and reducing costs have always been key concerns for transformer manufacturers. The technical and economic indicators of dry-type transformers determine the future prospects of transformer manufacturers. As the capacity of dry-type transformers increases, when the low-voltage winding voltage exceeds 6kV, improper insulation treatment at the lead wire locations can cause the transformer to fail insulation performance tests. This solution effectively improves upon previous insulation treatment methods, making the lead wire ends integral with the winding, thus avoiding previous technical problems. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides an insulation treatment structure for the beginning and end of a dry-type transformer winding.

[0004] An insulation treatment structure for the beginning and end of a dry-type transformer winding includes a low-voltage winding. The low-voltage winding includes a conductor copper wire, an interlayer insulation layer, and a beginning lead and a end lead of the low-voltage winding. The interlayer insulation layer and the conductor copper wire are layer-wound to form the low-voltage winding. Both the upper and lower ends of the low-voltage winding are provided with winding end insulation layers. The beginning lead and the end lead are both led out from the top of the low-voltage winding, and the roots of the beginning lead and the end lead are covered with composite insulating bosses.

[0005] As a preferred embodiment, the composite insulating boss has a three-layer structure: the innermost layer is DMD prepreg fabric tightly attached to the first or last lead wire; the middle layer is wrapped with fiberglass tape; and the outermost layer is a thermoplastic insulating tube fixedly installed on the winding end insulation layer.

[0006] Furthermore, the DMD prepreg has a heat resistance rating of ≥F, a thickness of 0.18~0.22mm, and an adhesive content of ≥40%.

[0007] Furthermore, the glass fiber tape is alkali-free and wax-free, with a basis weight ≥120g / ㎡, and is surface-treated with a silane coupling agent.

[0008] As a preferred embodiment, the top ends of the first-end lead and the tail-end lead are respectively welded to the first-end copper busbar and the tail-end copper busbar.

[0009] The present invention, by adopting the above technical solution, has the following beneficial effects compared with the prior art: Practice has proven that the insulation treatment structure of the beginning and end of the winding of the dry-type transformer, during transformer assembly, due to the wrapping process of the lead wire part during winding, can better wrap the thermoplastic insulating tube around the root of the lead wire at the beginning and end of the winding, so that the end face of the winding and the thermoplastic insulating tube form a whole, thereby improving the insulation performance of the transformer.

[0010] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0012] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0013] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0014] in, Figures 1 to 2 The correspondence between the reference numerals and components in the attached drawings is as follows:

[0015] 1. Low-voltage winding, 2. Conductor copper wire, 3. Interlayer insulation layer, 4. Winding end insulation layer, 5. Start end lead, 6. End end lead, 7. DMD prepreg cloth, 8. Fiberglass tape, 9. Thermoplastic insulation tube, 10. Start end copper busbar, 11. End end copper busbar. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0018] The following is combined Figures 1 to 2 The insulation treatment structure of the beginning and end of the dry-type transformer winding in an embodiment of this utility model will be described in detail.

[0019] like Figure 1 , Figure 2As shown, this utility model proposes a winding head and tail insulation treatment structure for a dry-type transformer, including a low-voltage winding 1. The low-voltage winding 1 includes a conductor copper wire 2, an interlayer insulation layer 3, and a head lead 5 and a tail lead 6. The interlayer insulation layer 3 and the conductor copper wire 2 are wound in layers to form the low-voltage winding 1. Both the upper and lower ends of the low-voltage winding 1 are provided with winding end insulation layers 4. The head lead 5 and the tail lead 6 are both led out from the top of the low-voltage winding 1, and the roots of the head lead 5 and the tail lead 6 are covered with composite insulation bosses. The composite insulation boss has a three-layer structure. The innermost layer of the composite insulation boss is DMD prepreg fabric 7 tightly attached to the head lead 5 or the tail lead 6. The middle layer is wrapped with glass fiber tape 8. The outermost layer is a thermoplastic insulation tube 9 fixedly installed on the winding end insulation layer 4. The DMD prepreg fabric 7 has a heat resistance rating of ≥F, a thickness of 0.18~0.22mm, and an adhesive content of ≥40%. The fiberglass tape 8 is alkali-free and wax-free, with a basis weight of ≥120g / ㎡, and is surface-treated with a silane coupling agent.

[0020] As a preferred embodiment, the top ends of the first lead 5 and the last lead 6 are respectively welded to the first copper busbar 10 and the last copper busbar 11.

[0021] Working process: For the low-voltage windings of dry-type transformers, insulation layers are added at the beginning and end positions. Specifically, glass fiber and DMD prepreg are used. During winding, the glass fiber and DMD prepreg are wound around the lead wires to form bosses, and then the entire structure is cast. Practical experience has proven that this insulation treatment structure at the beginning and end of the dry-type transformer windings, due to the wrapping process on the lead wires during winding, allows the thermoplastic insulating tube to better wrap around the roots of the lead wires at the beginning and end of the windings, forming a unified whole between the winding end face and the thermoplastic insulating tube, thus improving the transformer's insulation performance.

[0022] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dry-type transformer winding head-to-head insulation processing structure, comprising a low-voltage winding (1), the low-voltage winding (1) comprising a conductor copper wire (2), an interlayer insulation layer (3), and a head lead wire (5) and a tail lead wire (6) of the low-voltage winding (1), characterized in that The interlayer insulation layer (3) and the conductor copper wire (2) are used to form a low-voltage winding (1). The low-voltage winding (1) has winding end insulation layers (4) at both the top and bottom ends. The first end lead (5) and the last end lead (6) are both led out from the top of the low-voltage winding (1). The roots of the first end lead (5) and the last end lead (6) are covered with composite insulation bosses.

2. The dry-type transformer winding end-to-end head insulation processing structure according to claim 1, characterized in that The composite insulating boss has a three-layer structure. The innermost layer of the composite insulating boss is DMD prepreg (7) which is closely attached to the first end lead (5) or the last end lead (6). The middle layer is wrapped with glass fiber tape (8). The outermost layer is a thermoplastic insulating tube (9) fixedly installed on the winding end insulation layer (4).

3. The insulation treatment structure for the beginning and end of a dry-type transformer winding according to claim 2, characterized in that... The DMD prepreg (7) has a heat resistance grade ≥ F, a thickness of 0.18~0.22mm, and an adhesive content ≥ 40%.

4. The dry-type transformer winding end-to-end head insulation processing structure according to claim 2, characterized in that The glass fiber tape (8) is alkali-free and wax-free, with a basis weight ≥120g / ㎡, and is surface-treated with silane coupling agent.

5. The dry-type transformer winding end-to-end head insulation processing structure according to claim 1, characterized in that The top ends of the first end lead (5) and the last end lead (6) are respectively welded to the first end copper busbar (10) and the last end copper busbar (11).

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