Transformers

Abstract

To provide a transformer capable of suppressing coil deformation due to short-circuit electromagnetic mechanical forces by using space-saving and lightweight coil holding fittings.SOLUTION: The coil holding fittings include a coil holding fitting base metal in contact with a coil and a reinforcing member positioned outside the coil holding fitting base metal. The reinforcing member is fixed to the coil holding fitting base metal by being connected by a joint member from the inside of the coil holding fitting base metal through a hole in the coil holding fitting base metal.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a transformer. [Background technology]

[0002] The internal structure of an amorphous transformer is a box-shaped structure made up of a coil clamp that clamps the coil wound around the iron core legs made of amorphous ribbon from the outside, and upper and lower fasteners that connect to the coil clamp.

[0003] Patent Document 1 discloses a structure of an oil-filled transformer that ensures the strength of the coil pressing metal fittings while preventing the retention of insulating oil due to fastening metal fittings. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-138931 A Summary of the Invention [Problem to be solved by the invention]

[0005] In order to reduce the size of the amorphous oil-filled transformer, the high short-circuit electromagnetic force is evening A fastener capable of suppressing deformation of the coil may be required.

[0006] In particular, since mechanical forces are directly transmitted to the coil clamping metal fittings that clamp the coil, the metal fittings must have a structure strong enough to withstand the mechanical forces.

[0007] However, if stays (reinforcing members) are added and the plate thickness of the members is increased in order to improve the strength of the coil retainer metal fittings, the overall dimensions will become larger and the total mass will increase.

[0008] An object of the present invention is to provide a transformer that can suppress deformation of a coil due to short-circuit electromagnetic mechanical force by using a space-saving and lightweight coil clamp metal fitting. [Means for solving the problem]

[0009] One embodiment of the transformer of the present invention is a transformer equipped with a coil clamping bracket that clamps a coil wound around an iron core leg made of an amorphous ribbon from the outside, and the coil clamping bracket comprises a coil clamping bracket base material that contacts the coil and a reinforcing member arranged on the outside of the coil clamping bracket base material, the coil clamping bracket base material has a hole portion at a predetermined location, and the reinforcing member is fixed to the coil clamping bracket base material by being connected by a joining member from the inside of the coil clamping bracket base material through the hole portion of the coil clamping bracket base material. Effect of the Invention

[0010] According to one aspect of the present invention, by using a space-saving and lightweight coil pressing metal fitting, it is possible to suppress deformation of the coil due to short-circuit electromagnetic mechanical force. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic explanatory diagram showing the appearance of an amorphous transformer according to a first embodiment. [Diagram 2] FIG. 2 is a schematic explanatory diagram showing the structure of a coil pressing fitting according to the first embodiment. [Diagram 3] FIG. 2 is a schematic explanatory diagram showing the structure of a coil pressing fitting according to the first embodiment. [Figure 4] FIG. 2 is a schematic explanatory diagram showing the structure of a coil pressing fitting according to the first embodiment. [Diagram 5] FIG. 2 is a cross-sectional view showing the structure of the coil pressing fitting of the first embodiment. [Figure 6] FIG. 2 is a schematic explanatory diagram showing the internal structure of an amorphous transformer in which the coil clamp metal fitting of the first embodiment is arranged. [Figure 7]FIG. 11 is a schematic explanatory diagram showing the internal structure of an amorphous transformer in which a coil pressing metal fitting having an extruded stay according to the second embodiment is arranged. [Figure 8] FIG. 11 is a schematic explanatory diagram showing the internal structure of an amorphous transformer in which a coil pressing metal fitting having a stay with a notch according to a third embodiment is arranged. [Figure 9] FIG. 2 is a schematic diagram showing the internal structure of a related transformer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] First, the internal structure of the relevant transformer will be described with reference to FIG. As shown in FIG. 7, the internal structure of a related amorphous oil-filled transformer is a box-shaped structure in which a coil clamp 701 that clamps from the outside a coil 703 wound around an iron core leg 702 made of an amorphous ribbon, and an upper fastening bracket 704 and a lower fastening bracket 705 are connected using a connecting bolt 706.

[0013] However, in order to reduce the size of the related amorphous oil-filled transformers, the high short-circuit electromagnetic force is evening A fastener capable of suppressing deformation of the coil may be required.

[0014] In particular, since mechanical force is directly transmitted to coil pressing metal fitting 701 that sandwiches coil 703, it is necessary for the structure to have a strength greater than or equal to the mechanical force.

[0015] However, if stays (reinforcing members) are added and the member plate thickness is increased in order to improve the strength of the coil pressing metal fitting 710, the external dimensions will become larger and the total mass will increase.

[0016] In the embodiment of the present invention, a transformer is provided that can suppress deformation of the coil due to short-circuit electromagnetic mechanical force by using a space-saving and lightweight coil pressing metal fitting.

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. EXAMPLES

[0018] First Embodiment An amorphous transformer according to a first embodiment will be described with reference to FIGS.

[0019] FIG. 1 shows the appearance of an amorphous transformer 101. As shown in FIG. 6, the internal structure of amorphous oil-filled transformer 101 is a box-shaped structure in which coil clamping bracket 401 clamps coil 403 wound around core leg 402 made of amorphous ribbon from the outside, and upper fastening bracket 404 and lower fastening bracket 405 are connected using connecting bolt 406.

[0020] 2 and 3, coil pressing metal fitting 401 includes coil pressing metal fitting base material 201, 301 that contacts coil 403, and reinforcing member (stay) 302 arranged on the outside of coil pressing metal fitting base material 201, 301. Coil pressing metal fitting base material 201, 301 has holes 202, 204 at predetermined positions.

[0021] The reinforcing member 302 is fixed to the coil pressing metal base materials 201, 301 by being connected from the inside (coil side) of the coil pressing metal base materials 201, 301 by a joining member (not shown) through holes 202, 204 of the coil pressing metal base materials 201, 301.

[0022] As shown in FIG. 3, the coil pressing metal base material 301 has step portions 304 provided on the upper and lower sides, and a flat portion 305 provided between the upper and lower step portions 304.

[0023] 2 and 3, the hole 202 provided in the coil pressing metal base material 201, 301 is a connection hole provided in a flat portion 305. On the other hand, the hole 204 provided in the coil pressing metal base material 201, 301 is a positioning hole provided in a stepped portion 304. The reinforcing member 302 has engagement portions 306 provided on the upper and lower portions.

[0024] 2, 3 and 4, the above-mentioned structure allows the engagement portion 306 of the reinforcing member 302 to be inserted into the stepped portion 304 of the coil pressing metal base material 301 via the positioning hole 204, and the reinforcing member 302 is positioned in this state. In this positioned state, the connection hole 202 of the coil pressing metal base material 301 is connected from the inside of the coil pressing metal base material 301 by a connection member.

[0025] Furthermore, the coil pressing metal base material 301 has a connection notch portion 203. The reinforcing member 302 is fixed to the coil pressing metal base material 301 via this connection notch portion 203. The reinforcing member 302 has a U-shape.

[0026] As shown in Figures 2, 3 and 4, two or more reinforcing members 302 are joined from the inside (coil side) of coil pressing metal base material 301 through holes 202, 204 of coil pressing metal base material 301 by joining members (not shown).

[0027] For example, the reinforcing member 302 is plug-welded from the inside of the coil pressing metal base material 301 through the holes 202, 204, thereby filling the holes 202, 204 with a joining material. In this manner, the reinforcing member 302 and the coil pressing metal base material 301 are joined. Here, the joining material is, for example, a conductive material, a solvent, etc.

[0028] 4, among two or more reinforcing members 302, adjacent reinforcing members 302 may be connected to each other via a welding material by welding. Here, adjacent reinforcing members 302 are connected from the outside by line welding. By performing line welding, the strength of the coil clamp metal fitting 303 can be further increased.

[0029] 3 and 4, reinforcing member 302 has a U-shaped structure, and two or more reinforcing members 302 are arranged side by side on coil pressing metal base material 301, and are connected to coil pressing metal base material 301 via holes 202, 204 and connection notches 203. In this way, coil pressing metal base material 303 is constructed by arranging and fixing two or more reinforcing members 302 side by side on coil pressing metal base material 301. Figure 5 shows the cross-sectional structure of completed coil pressing metal base material 303.

[0030] According to the first embodiment, by using the space-saving and lightweight coil pressing metal fittings 401, 303, it is possible to suppress deformation of the coil 403 due to a short-circuit electromagnetic mechanical force.

[0031] In addition, the reinforcing member 302 arranged on the outside of the coil pressing metal base material 301 of the coil pressing metal 401, 303 is U-shaped. Therefore, the chimney effect promotes the circulation of insulating oil due to the temperature difference between the top and bottom of the transformer tank, improving the cooling efficiency of the transformer and enabling the transformer to be made smaller and lighter. EXAMPLES

[0032] Second Embodiment With reference to FIG. 7, an amorphous oil-immersed transformer according to a second embodiment will be described. As shown in FIG. 7, the internal structure of amorphous oil-filled transformer 101 is a box-shaped structure in which coil clamping bracket 501 clamps coil 503 wound around core leg 502 made of amorphous ribbon from the outside, and upper fastening bracket 504 and lower fastening bracket 505 are connected using connecting bolt 506.

[0033] 2 and 3, coil pressing metal fitting 501 has holes 203, 204 and connection notch 203 in coil pressing metal fitting base material 201, 301. Reinforcing member (stay) 302 has a U-shaped structure, and two or more are arranged side by side in coil pressing metal fitting base material 301, and the reinforcing member is joined from the inside of coil pressing metal fitting base material 201, 301 via joining member (not shown) through holes 202, 204 and connection notch 203. Other specific configurations are the same as those of the amorphous oil-filled transformer of Example 1, so description thereof will be omitted.

[0034] The amorphous oil-filled transformer of Example 2 differs from the amorphous oil-filled transformer of Example 1 in that the reinforcing member (stay) 302 has an uneven portion 507 on its surface. The uneven portion 507 is formed by pressing the reinforcing member 302 by pressing.

[0035] According to the second embodiment, it is possible to suppress deformation of the coil 503 due to a short-circuit electromagnetic mechanical force by using the space-saving and lightweight coil pressing metal fitting 501. Furthermore, by providing the uneven portion 507 on the surface of the reinforcing member 302, it is possible to further increase the strength of the coil pressing metal fitting 501. EXAMPLES

[0036] Third embodiment An amorphous oil-immersed transformer according to a third embodiment will be described with reference to FIG. As shown in FIG. 8, the internal structure of amorphous oil-filled transformer 101 is a box-shaped structure in which coil clamping metal fittings 601 that clamp coil 603 wound around core legs 602 made of amorphous ribbon from the outside, upper fastening metal fittings 604 and lower fastening metal fittings 605 are connected using connecting bolts 606.

[0037] 2 and 3, coil pressing metal fitting 601 has holes 202, 204 and connection notch 203 in coil pressing metal fitting base material 201, 301. Reinforcing member (stay) 302 has a U-shaped structure, and two or more are arranged side by side in coil pressing metal fitting base material 301, and the reinforcing member is joined from the inside of coil pressing metal fitting base material 201, 301 via joining member (not shown) through holes 202, 204 and connection notch 203. Other specific configurations are the same as those of the amorphous oil-filled transformer of Example 1, so description thereof will be omitted.

[0038] The amorphous oil-filled transformer of Example 3 differs from the amorphous oil-filled transformer of Example 1 in that the reinforcing member (stay) 302 has a surface with a plurality of notches (through holes) 607. The notches 607 are formed by forming notches in the reinforcing member 302 by press working.

[0039] According to the third embodiment, it is possible to suppress deformation of the coil 603 due to short-circuit electromagnetic mechanical force by using a space-saving and lightweight coil pressing metal fitting 601. Furthermore, by providing a plurality of notches 607 on the surface of the reinforcing member 302, it is possible to reduce the weight of the coil pressing metal fitting 601 while maintaining the strength of the coil pressing metal fitting 601 at a constant level.

[0040] The above-mentioned embodiment is an oil-filled transformer equipped with a coil clamping metal fitting that clamps from the outside a coil wound around an iron core leg made of an amorphous ribbon, and the coil clamping metal fitting is equipped with a coil clamping metal fitting base material that contacts the coil and a reinforcing member (stay) that is arranged on the outside of the coil clamping metal fitting base material, and the reinforcing member (stay) is connected from the inside through a hole in the coil clamping metal fitting base material, thereby filling the hole.

[0041] According to the above embodiment, by using a space-saving and lightweight coil pressing metal fitting, it is possible to suppress deformation of the coil due to short-circuit electromagnetic mechanical force.

[0042] The present invention is not limited to the above-mentioned embodiment, but includes various modified examples. For example, the above-mentioned embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to those having all of the configurations described. In addition, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace other configurations or materials with respect to a part of the configuration of each embodiment. [Explanation of symbols]

[0043] 101 Amorphous oil-filled transformer 201 Coil clamp base material 301 Coil clamp base material 202 Hole 204 Hole 203 Connection notch 302 Reinforcement member (stay) 303 Coil clamp 401 Coil clamp 501 Coil clamp 507 Uneven part 601 Coil clamp 607 Notch 701 Coil clamp

Claims

1. A transformer having a coil clamp that clamps from the outside a coil wound around an iron core leg made of an amorphous ribbon, The coil clamping metal fitting is A coil pressing metal base material in contact with the coil; a reinforcing member disposed on the outside of the coil pressing metal base material, The coil retainer base material has a hole at a predetermined location, The reinforcing member is the coil pressing metal base material is fixed to the coil pressing metal base material by being connected from the inside of the coil pressing metal base material by a joining member through the hole portion of the coil pressing metal base material, The coil clamp base material is Step portions provided above and below; A flat portion provided between the upper and lower step portions, The hole of the coil pressing metal base material is a positioning hole provided in the step portion and a connection hole provided in the flat portion, The reinforcing member is The locking member has upper and lower engagement portions, a connecting member that connects the reinforcing member to the coil clamping metal base material from the inside of the coil clamping metal base material, and the connecting hole that connects the reinforcing member to the coil clamping metal base material from the inside of the coil clamping metal base material, when the engaging portion of the reinforcing member is inserted into the step portion of the coil clamping metal base material through the positioning hole and positioned.

2. The coil retainer metal base material further has a connection notch portion, 2. The transformer according to claim 1, wherein the reinforcing member is fixed to the coil pressing metal base material via the connection notch.

3. The transformer according to claim 1 , wherein the reinforcing member has a U-shape.

4. The transformer as described in claim 1, characterized in that two or more of the reinforcing members are arranged and fixed side by side on the coil clamp metal base material by connecting the two or more reinforcing members to the inside of the coil clamp metal base material through the holes in the coil clamp metal base material using the joining members.

5. 5. The transformer according to claim 4, wherein adjacent ones of the two or more reinforcing members are connected to each other by a welding material.

6. The reinforcing member is 2. The transformer according to claim 1, wherein the surface of the transformer is uneven.

7. The reinforcing member is 2. The transformer according to claim 1, further comprising a plurality of notches on a surface thereof.

8. A transformer having a coil clamp that clamps from the outside a coil wound around an iron core leg made of an amorphous ribbon, The coil clamping metal fitting is A coil pressing metal base material in contact with the coil; a reinforcing member disposed on the outside of the coil pressing metal base material, The coil retainer base material has a hole at a predetermined location, The reinforcing member is the coil pressing metal base material is fixed to the coil pressing metal base material by being connected from the inside of the coil pressing metal base material by a joining member through the hole portion of the coil pressing metal base material, The coil retainer metal base material further has a connection notch portion, a coil retainer base material and a reinforcing member fixed to the coil retainer base material via the connection notch portion;

9. A transformer having a coil clamp that clamps from the outside a coil wound around an iron core leg made of an amorphous ribbon, The coil clamping metal fitting is A coil pressing metal base material in contact with the coil; a reinforcing member disposed on the outside of the coil pressing metal base material, The coil retainer base material has a hole at a predetermined location, The reinforcing member is the coil pressing metal base material is fixed to the coil pressing metal base material by being connected from the inside of the coil pressing metal base material by a joining member through the hole portion of the coil pressing metal base material, The two or more reinforcing members are connected to the coil pressing metal base material from the inside of the coil pressing metal base material through the holes in the coil pressing metal base material by the joining members, so that the two or more reinforcing members are arranged side by side on the coil pressing metal base material and fixed thereto; A transformer, characterized in that, of the two or more reinforcing members, adjacent reinforcing members are connected to each other by a welding material.

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