A terminal for a dry-type winding with an elastic insulator

Abstract

The application discloses a wire outlet terminal suitable for a dry type variable winding and wrapped by an elastic insulator, which comprises a copper nut and a clamping plate. The copper nut is in a column shape and comprises a quadrangular body and a cylinder body. The end of the cylinder body is connected with a wire outlet head of the variable winding, thereby forming the wire outlet terminal of the variable winding. The clamping plate is provided with a square hole in the middle. The quadrangular body of the copper nut is embedded into the square hole, so that the copper nut is fixed on the clamping plate. After the copper nut is fixed, the clamping plate is fused with the elastic insulator as a whole. The application can strengthen and adapt to the elastic insulator wrapped winding.

Description

Technical Field

[0001] This invention relates to a lead-out terminal suitable for a dry-type transformer winding encapsulated with an elastic insulator, belonging to the technical field of dry-type transformers. Background Technology

[0002] The mainstream type of dry-type transformer is the epoxy resin-encapsulated dry-type transformer. Epoxy resin has stable insulation properties, but it becomes a rigid body after curing, which poses a risk of cracking under certain operating conditions. Therefore, replacing epoxy resin with a rubber-based elastomer for winding encapsulation can eliminate cracking problems under extreme environments. At the same time, for windings encapsulated with rubber-based elastic insulators, special treatment is required for the outgoing terminals that are frequently exposed to external forces to meet mechanical strength requirements. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lead-out terminal suitable for dry-type transformer windings encapsulated with elastic insulators, which can strengthen and adapt to the windings encapsulated with elastic insulators. To achieve the above objective, this invention is implemented using the following technical solution:

[0004] This invention provides a lead-out terminal suitable for a dry-type transformer winding encapsulated with an elastic insulator, comprising:

[0005] Copper nuts and clamps;

[0006] The copper nut is cylindrical, including a cuboid and a cylinder. The end of the cylinder is connected to the lead wire of the variable winding to form the lead wire terminal of the variable winding.

[0007] The card plate has a square hole in the middle, and the cube of the copper nut is embedded in the square hole, so that the copper nut is fixed on the card plate. After the copper nut is fixed, the card plate and the elastic insulator are integrated into one.

[0008] Furthermore, several through holes are evenly distributed around the square hole, which are used to connect and fuse the card plate with the elastic insulator.

[0009] Furthermore, the card plate is provided with a toothed structure around its perimeter, which is used to penetrate and fuse the card plate with the elastic insulator.

[0010] Furthermore, the elastic insulator is made of silicone rubber or nitrile rubber, which is obtained by vulcanization after liquid vacuum pressure potting of the transformer winding.

[0011] Furthermore, the card plate undergoes a surface roughening treatment and is coated with a coupling agent to increase the adhesion between the card plate and the elastic insulator.

[0012] Furthermore, the material of the cardboard is one of the following: silicone rubber board with a Shore angle of 65° or higher, epoxy glass cloth laminate, diphenyl ether glass cloth board, and polyimide glass cloth board.

[0013] Furthermore, the inner diameter of the square hole is the same as the outer diameter of the cuboid, and the square hole is used to hold the copper nut.

[0014] Compared with the prior art, the beneficial effects achieved by the lead-out terminal of the dry-type transformer winding with elastic insulator encapsulation provided by the embodiments of the present invention include:

[0015] This invention includes a copper nut and a retaining plate. The copper nut is cylindrical, comprising a cuboid and a cylindrical portion. The end of the cylindrical portion connects to the lead-out terminal of the transformer winding, forming the lead-out terminal of the transformer winding. The retaining plate has a square hole in the center, into which the cuboid portion of the copper nut is inserted, thus fixing the copper nut to the retaining plate. After the copper nut is fixed, the retaining plate and the elastic insulator are integrated. This invention fixes the copper nut and the retaining plate in a simple, easy-to-operate manner with good fixing effect. After the copper nut and the retaining plate are fixed, the retaining plate is then tightly integrated with the elastic insulator, which can effectively optimize phase-to-phase insulation, reduce phase-to-phase distance, and avoid vibration noise from the phase separator.

[0016] This invention has a simple structure, does not increase costs, ensures the mechanical strength of the winding output terminals, and solves the problem of easy tearing of the output terminals in this type of product. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the outgoing terminal of a dry-type transformer winding with elastic insulator encapsulation according to Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the copper nut in Embodiment 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the card plate in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the card plate in Embodiment 2 of the present invention;

[0021] Figure 5 This is a schematic diagram of the card plate for disassembling terminals in Embodiment 3 of the present invention.

[0022] In the diagram: 1. Copper nut; 1-1. Cuboid; 1-2. Cylinder;

[0023] 2. Card plate, 2-1. Square hole, 2-2. Toothed structure, 2-3. Through hole. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0025] Example 1:

[0026] like Figure 1 As shown, this embodiment provides a lead-out terminal suitable for a dry-type transformer winding encapsulated with an elastic insulator, including a copper nut 1 and a retaining plate 2.

[0027] like Figure 2 As shown, the copper nut 1 is cylindrical, comprising a cuboid 1-1 and a cylinder 1-2. The end of the cylinder 1-2 is connected to the lead-out end of the variable winding, forming the lead-out terminal of the variable winding. The cuboid 1-1 has internal threads. Preferably, the cuboid 1-1 can be replaced with a copper stud, with the remaining structure being the same as the copper nut 1.

[0028] like Figure 3 As shown, the card plate 2 has a square hole 2-1 in the middle. The cuboid 1-1 of the copper nut 1 is embedded in the square hole 2-1. The inner diameter of the square hole 2-1 is the same as the outer diameter of the cuboid 1-1, so that the copper nut 1 is fixed on the card plate 2. The card plate 2 has a toothed structure 2-2 around its perimeter. In this embodiment, the toothed structure 2-2 is a groove, which is used to penetrate and fuse the card plate 2 with the elastic insulator. Several through holes 2-3 are evenly distributed around the square hole 2-1. The through holes 2-3 are used to penetrate and fuse the card plate 2 with the elastic insulator.

[0029] The elastic insulator is made of silicone rubber or nitrile rubber, which is obtained by liquid vacuum pressure potting of transformer windings and then vulcanization.

[0030] The material of the card plate 2 is one of the following: silicone rubber sheet with a Shore angle of 65° or higher, epoxy glass cloth laminate, diphenyl ether glass cloth sheet, and polyimide glass cloth sheet. The card plate 2 has a roughened surface and is coated with a coupling agent to increase the adhesion between the card plate 2 and the elastic insulator.

[0031] Example 2:

[0032] A terminal block suitable for a dry-type transformer winding encapsulated with an elastic insulator includes a copper nut 1 and a retaining plate 2. In this embodiment, the copper nut 1 has the same structure as the copper nut 1 in Embodiment 1.

[0033] like Figure 4 As shown, in this embodiment, the card plate 2 is a variation of the card plate 2 in embodiment 1. The card plate 2 has a square hole 2-1 in the center. The cuboid 1-1 of the copper nut 1 is embedded in the square hole 2-1. The inner diameter of the square hole 2-1 is the same as the outer diameter of the cuboid 1-1, thus fixing the copper nut 1 to the card plate 2. The card plate 2 has a toothed structure 2-2 around its perimeter. In this embodiment, the toothed structure 2-2 is a convex tooth, used to penetrate and fuse the card plate 2 with the elastic insulator. Several through holes 2-3 are evenly distributed around the square hole 2-1, used to penetrate and fuse the card plate 2 with the elastic insulator.

[0034] The elastic insulator is made of silicone rubber or nitrile rubber, which is obtained by liquid vacuum pressure potting of transformer windings and then vulcanization.

[0035] The material of the card plate 2 is one of the following: silicone rubber sheet with a Shore angle of 65° or higher, epoxy glass cloth laminate, diphenyl ether glass cloth sheet, and polyimide glass cloth sheet. The card plate 2 has a roughened surface and is coated with a coupling agent to increase the adhesion between the card plate 2 and the elastic insulator.

[0036] Example 3:

[0037] A terminal block suitable for a dry-type transformer winding encapsulated with an elastic insulator includes a copper nut 1 and a retaining plate 2. In this embodiment, the copper nut 1 has the same structure as the copper nut 1 in Embodiment 1.

[0038] like Figure 5 As shown, in this embodiment, the card plate 2 is the tap terminal card plate 2 of the card plate 2 in embodiment 1. The card plate 2 has several square holes 2-1 in the center. The inner diameter of the square holes 2-1 is consistent with the outer diameter of the cuboid 1-1 of each copper nut 1. The cuboid 1-1 of each copper nut 1 is inserted into the square holes 2-1 to fix the copper nut 1 on the card plate 2. The card plate 2 has toothed structures 2-2 around its perimeter. In this embodiment, the toothed structures 2-2 are grooves, which are used to penetrate and fuse the card plate 2 with the elastic insulator. Several through holes 2-3 are evenly distributed around the square holes 2-1. The through holes 2-3 are used to penetrate and fuse the card plate 2 with the elastic insulator.

[0039] The elastic insulator is made of silicone rubber or nitrile rubber, which is obtained by liquid vacuum pressure potting of transformer windings and then vulcanization.

[0040] The material of the card plate 2 is one of the following: silicone rubber sheet with a Shore angle of 65° or higher, epoxy glass cloth laminate, diphenyl ether glass cloth sheet, and polyimide glass cloth sheet. The card plate 2 has a roughened surface and is coated with a coupling agent to increase the adhesion between the card plate 2 and the elastic insulator.

[0041] In summary, although the elastic insulator has weaker tear resistance, the structure described above ensures that the copper nut 1 is securely held in the clamping plate 22, which in turn is tightly integrated with the elastic insulator, thus guaranteeing the mechanical strength of the winding terminals. This method is simple to implement and does not increase costs.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A lead-out terminal suitable for a dry-type transformer winding encapsulated with an elastic insulator, characterized in that, include: Copper nuts and clamps; The copper nut is cylindrical, including a cuboid and a cylinder. The end of the cylinder is connected to the lead wire of the variable winding to form the lead wire terminal of the variable winding. The card plate has a square hole in the middle, and the cube of the copper nut is embedded in the square hole to fix the copper nut on the card plate. After the copper nut is fixed, the card plate and the elastic insulator are fused together. The square hole is surrounded by several through holes, which are used to fused the card plate and the elastic insulator; the card plate is provided with a toothed structure around its perimeter, which is used to penetrate and fuse the card plate and the elastic insulator. The tooth-shaped structure is either a protruding tooth or a groove, which is used to penetrate and fuse the card plate with the elastic insulator. The card plate has a roughened surface and is coated with a coupling agent to increase the adhesion between the card plate and the elastic insulator.

2. The lead-out terminal of a dry-type transformer winding with elastic insulator encapsulation according to claim 1, characterized in that, The elastic insulator is made of silicone rubber or nitrile rubber, which is obtained by vulcanization after being potted by liquid vacuum pressure on the transformer winding.

3. The lead-out terminal of a dry-type transformer winding with elastic insulator encapsulation as described in claim 1, characterized in that, The material of the cardboard is one of the following: silicone rubber board with a Shore value of 65° or higher, epoxy glass cloth laminate, diphenyl ether glass cloth board, and polyimide glass cloth board.

4. The lead-out terminal of a dry-type transformer winding with elastic insulator encapsulation as described in claim 1, characterized in that, The inner diameter of the square hole is the same as the outer diameter of the cuboid, and the square hole is used to hold the copper nut.

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