Dry-type bushing for oil immersed transformer or switch cabinet
By designing a combination of groove structure and creepage fins on the insulating layer of the dry casing, the problem of increasing sleeve length and manufacturing cost when increasing creepage distance in the prior art is solved, and the effect of further increasing creepage distance is achieved while controlling the sleeve size.
Patent Information
- Application Number
- CN202421007489.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-10
AI Technical Summary
When the existing dry casing increases the creepage fins to increase the creepage distance, it will lead to an increase in the casing length and manufacturing cost, making it difficult to further increase the creepage distance while controlling the casing size.
The integrated molding design of the insulating layer is adopted, and an inwardly recessed groove structure is provided at one or both ends of the insulating layer. Combined with the design of the crawling distance fins and flanges, the path to the end surface of the insulating layer is increased, thereby increasing the creepage distance.
Without increasing the number of climbing distance fins, the creepage distance of the dry sleeve is successfully increased through the combination of groove structure and climbing distance fins, and while controlling the sleeve size, the manufacturing cost is reduced.
Smart Images
Figure CN222637028U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bushings, in particular to a dry-type bushing for an oil-immersed transformer or a switch cabinet. Background Art
[0002] With the development of new energy such as wind power / photovoltaic, the market demand for wind power / photovoltaic box transformers is very large. Among the box transformers used in wind power / photovoltaic, most of them are used as follows Figure 1 The dry-type bushing shown is a device that allows conductors to pass through partitions such as boxes and provides insulation and support. It is also a very important device in oil-immersed transformers or switchgear.
[0003] Creepage distance, also known as creepage distance, refers to the shortest distance from one conductor to another along the surface of the insulator between them. Creepage distance is an important performance parameter of dry bushing. At present, dry bushings are usually used in the following ways: Figure 1 The insulating fins shown are used to increase the creepage distance of the sleeve. Although the fins increase the creepage distance at both ends of the sleeve, if too many fins are added, the sleeve length will increase and the manufacturing cost will also increase. Utility Model Content
[0004] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a dry-type bushing for an oil-immersed transformer or a switch cabinet, and to increase the creepage distance of the dry-type bushing.
[0005] The purpose of this utility model is achieved by the following technical solutions:
[0006] A dry-type bushing for an oil-immersed transformer or switch cabinet comprises a conductive rod and an insulating layer. The insulating layer is integrally formed on the outside of the conductive rod. One or both ends of the insulating layer are provided with an inwardly recessed groove structure, which separates the insulating layer and the conductive rod at the end.
[0007] Furthermore, the dry bushing includes creepage fins, and the creepage fins are provided on the insulation layer.
[0008] Furthermore, a flange is fixed on the dry bushing, and the flange is sleeved on the insulating layer.
[0009] Furthermore, the flange is close to one end of the dry-type bushing, and the groove structure is located at the short end of the dry-type bushing.
[0010] Furthermore, creepage fins are provided on both sides of the flange, and the groove structure is located in the creepage fins at the end of the dry casing.
[0011] Furthermore, the flange is close to one end of the dry bushing, the long end of the dry bushing is provided with an annular insulating member, the conductive rod extends into the annular insulating member, and the annular insulating member is provided with the inwardly recessed groove structure.
[0012] Furthermore, the creepage fins include large fins and small fins, and the large fins and the small fins are arranged outside the insulation layer at intervals.
[0013] Furthermore, the insulating layer and the creepage fins are made by casting insulating material.
[0014] The beneficial effects of the utility model are:
[0015] While increasing the creepage distance of the dry-type bushing through the creepage fins, the path on the end surface of the insulation layer is increased through the groove structure. Without increasing the number of creepage fins, the creepage distance is increased. The creepage distance can be adjusted by changing the shape and length of the groove edge. Under the premise of controlling the size of the dry-type bushing, the creepage distance can be increased as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural diagram of a dry-type casing in the prior art;
[0017] Figure 2 is a schematic structural diagram of Example 1;
[0018] Figure 3 is a schematic structural diagram of Example 2;
[0019] Figure 4 is a schematic structural diagram of Example 3;
[0020] In the figure: 1. Conductive rod; 2. Insulation layer; 3. Creepage distance fin; 31. Large fin; 32. Small fin; 4. Groove structure; 5. Flange; 6. Box wall; 7. Annular insulation. DETAILED DESCRIPTION
[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clearly understood, the utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0022] like Figures 2-4 As shown, the utility model provides a dry-type bushing for an oil-immersed transformer or switch cabinet, comprising a conductive rod 1, an insulating layer 2 and a creepage fin 3. The insulating layer 2 is integrally formed on the outside of the conductive rod 1, and the creepage fin 3 is fixed on the insulating layer 2. One end or both ends of the insulating layer 2 are provided with an inwardly concave groove structure 4, which separates the insulating layer 2 and the conductive rod 1 at the end.
[0023] like Figure 1As shown, existing dry-type bushings all increase creepage distance by using fins. Although increasing the number and size of fins can adjust the creepage distance, it will increase the size of the dry-type bushing and also increase the corresponding cost.
[0024] By adopting the structure of the present invention, while increasing the creepage distance of the dry-type bushing through the creepage fin 3, the path on the end surface of the insulating layer 2 is increased through the groove structure 4. Without increasing the number of creepage fins 3, the creepage distance is increased. The creepage distance can be adjusted by changing the shape and length of the groove edge. Under the premise of controlling the size of the dry-type bushing, the creepage distance can be increased as much as possible.
[0025] In the present invention, the insulating layer 2 and the conductive rod 1 are inseparable and are manufactured by an integral molding process.
[0026] A flange 5 is fixed on the dry bushing, which is sleeved on the insulating layer 2. The dry bushing is used to pass through the partition in the power equipment system. The flange 5 is used to fix the dry bushing on the partition of the oil-immersed transformer or switch cabinet.
[0027] Furthermore, the creepage fin 3 includes a large fin 31 and a small fin 32 , and the large fin 31 and the small fin 32 are arranged outside the insulation layer 2 at intervals.
[0028] Furthermore, the insulating layer 2 and the creepage fins 3 are made by casting insulating materials, for example, epoxy resin materials.
[0029] Example 1
[0030] refer to Figure 2 This embodiment provides a dry-type bushing, including a conductive rod 1, an insulating layer 2 and a creepage fin 3. The insulating layer 2 is arranged on the outside of the conductive rod 1, and the creepage fin 3 is sleeved on the insulating layer 2. One end of the insulating layer 2 is provided with an inwardly concave groove structure 4, which separates the insulating layer 2 and the conductive rod 1 at the end.
[0031] The flange 5 is close to one end of the dry type bushing. The dry type bushing is divided into a long end and a short end with the flange 5 as a boundary. The groove structure 4 is located at the short end of the dry type bushing.
[0032] The flange 5 is fixed on the box wall 6, and the groove structure 4 and the creepage distance fin 3 jointly increase the creepage distance.
[0033] Example 2
[0034] refer to Figure 3 This embodiment provides a dry-type bushing, including a conductive rod 1, an insulating layer 2 and a creepage fin 3. The insulating layer 2 is arranged on the outside of the conductive rod 1, and the creepage fin 3 is sleeved on the insulating layer 2. Both ends of the insulating layer 2 are provided with inwardly concave groove structures 4, which separate the insulating layer 2 and the conductive rod 1 at the end.
[0035] Creepage fins 3 are provided on both sides of the flange 5 , and the groove structure 4 is located in the creepage fins 3 at the end of the dry bushing. At the same time, the groove structure 4 is provided in the middle of the insulating layer 2 , and the conductive rod 1 extends into the groove structure 4 .
[0036] The flange 5 is fixed on the box wall 6, and the groove structures 4 at both ends and the creepage fins 3 jointly increase the creepage distance.
[0037] Example 3
[0038] refer to Figure 4 This embodiment provides a dry-type bushing, including a conductive rod 1, an insulating layer 2 and a creepage fin 3. The insulating layer 2 is arranged on the outside of the conductive rod 1, and the creepage fin 3 is sleeved on the insulating layer 2. Both ends of the insulating layer 2 are provided with inwardly concave groove structures 4, which separate the insulating layer 2 and the conductive rod 1 at the end.
[0039] The flange 5 is close to one end of the dry bushing. The dry bushing is divided into a long end and a short end with the flange 5 as the boundary. The long end of the dry bushing is provided with an annular insulating part 7. The conductive rod 1 extends into the annular insulating part 7. The annular insulating part 7 is provided with an inwardly concave groove structure 4.
[0040] Furthermore, an inwardly recessed groove structure 4 is also provided in the creepage fin 3 at the short end of the dry-type bushing.
[0041] The groove structure 4 is provided in the middle of the annular insulating member 7 , the conductive rod 1 extends into the annular insulating member 7 , and the annular insulating member 7 is located outside one end of the dry-type bushing.
[0042] The flange 5 is fixed on the box wall 6. The groove structure 4 at one end of the dry bushing at the annular insulating member 7 increases the creepage distance outside the dry bushing, and the groove structure 4 at the other end increases the creepage distance inside the dry bushing.
[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall fall within the scope of protection of the present invention.
Claims
1. A dry bushing for an oil-immersed transformer or switch cabinet, characterized in that: The invention comprises a conductive rod (1), an insulating layer (2) and a creepage fin (3), wherein the insulating layer (2) is integrally formed on the outside of the conductive rod (1), one end or both ends of the insulating layer (2) are provided with an inwardly recessed groove structure (4), wherein the groove structure (4) separates the insulating layer (2) and the conductive rod (1) at the end, and the creepage fin (3) comprises a large fin (31) and a small fin (32), wherein the large fin (31) and the small fin (32) are arranged at intervals outside the insulating layer (2); a flange (5) is fixed on the dry-type bushing, wherein the flange (5) is sleeved on the insulating layer (2), and the insulating layer (2) and the creepage fin (3) are made by casting insulating material; The flange (5) is close to one end of the dry bushing, and the groove structure (4) is located at the short end of the dry bushing; or, creepage fins (3) are provided on both sides of the flange (5), and the groove structure (4) is located inside the creepage fins (3) at the end of the dry bushing; or, the flange (5) is close to one end of the dry bushing, an annular insulating member (7) is provided at the long end of the dry bushing, the conductive rod (1) extends into the annular insulating member (7), and the annular insulating member (7) is provided with the groove structure (4) recessed inwardly.