Stationary induction apparatus

Abstract

To provide a stationary induction apparatus having a structure for supporting a wound iron core with a simple structure.SOLUTION: A stationary induction apparatus according to an embodiment includes: a wound iron core configured by winding a belt-shaped member made of an amorphous metal and having a plurality of leg parts between an upper yoke part and a lower yoke part; a coil including a winding wound around the plurality of leg parts; and an auxiliary member configured by an insulating member and disposed between the upper yoke part and the lower yoke part and the coil. Both end parts of the auxiliary member in a depth direction, which is a direction perpendicular to the direction in which the plurality of leg parts is arranged, protrude outward in the depth direction from both end parts of the plurality of leg parts in the depth direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This embodiment of the invention relates to a stationary induction machine. [Background technology]

[0002] Static induction equipment, such as transformers for high-voltage power distribution equipment, includes stacked cores made of multiple laminated electromagnetic steel sheets, such as silicon steel sheets, and wound cores with strips of amorphous steel sheets wound around them. It is known that not applying excessive stress to the core improves magnetic properties and reduces noise. Amorphous cores are about one-tenth the thickness of silicon steel sheets, and are known to have low rigidity and high stress sensitivity.

[0003] For example, Patent Document 1 discloses an amorphous core transformer having an integrated configuration comprising a magnetic core formed by winding an amorphous magnetic alloy ribbon, a coil provided on the magnetic core, coil support materials provided above and below the coil, and a magnetic core support material for fixing the magnetic core to a case, the coil support materials being provided above and below the coil to support the coil, and the magnetic core being fixed by the magnetic core support material so that the fixed contact portion between the magnetic core support material and a band is located outside the extension line of the inner surface of the magnetic legs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 5-067533 Summary of the Invention [Problem to be solved by the invention]

[0005] The use of additional parts to secure the amorphous core affects manufacturability and costs, so there is a need for an inexpensive structure that supports the core without increasing the number of parts and without degrading the magnetic properties of the core.

[0006] A stationary induction device having a simple structure for supporting a wound core is provided. [Means for solving the problem]

[0007] The stationary induction device of this embodiment includes a wound core formed by winding a strip-shaped member of amorphous metal and having multiple legs between an upper yoke portion and a lower yoke portion, a coil including a winding wound around the multiple legs, and an auxiliary member formed of an insulating member and arranged between the upper yoke portion, the lower yoke portion, and the coil. Both ends of the auxiliary member in a depth direction, which is a direction perpendicular to the direction in which the multiple legs are arranged, protrude outward in the depth direction beyond both ends of the multiple legs in the depth direction. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing a schematic configuration of an example in which the stationary induction device according to the first embodiment is applied to a transformer; [Figure 2] 2 is a longitudinal cross-sectional view taken along line II-II in FIG. 1, showing a schematic configuration of an example in which the stationary induction device according to the first embodiment is applied to a transformer. [Figure 3] FIG. 1 is a plan view showing a schematic configuration of an example in which the stationary induction device according to the first embodiment is applied to a transformer, with upper and lower support members omitted; [Figure 4] FIG. 6 is a partial cross-sectional view of the coil and wound core taken along line VI-VI of FIG. [Figure 5] FIG. 10 is a plan view showing a schematic configuration of an example in which the stationary induction device according to the second embodiment is applied to a transformer, with upper and lower support members omitted; [Figure 6] FIG. 10 is a plan view showing a schematic configuration of an example in which the stationary induction device according to the third embodiment is applied to a transformer, with upper and lower support members omitted. [Figure 7] FIG. 10 is a plan view showing a schematic configuration of an example in which the stationary induction device according to the fourth embodiment is applied to a transformer, with upper and lower support members omitted; [Figure 8]FIG. 10 is a partial front view showing a schematic configuration of an example in which the stationary induction device according to the fourth embodiment is applied to a transformer, with upper and lower support members omitted. [Figure 9] FIG. 10 is a partial front view showing a schematic configuration of another example in which the stationary induction device according to the fourth embodiment is applied to a transformer, with upper and lower support members omitted. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, examples in which static induction devices according to a number of embodiments are applied to three-phase transformers will be described with reference to the drawings. Note that substantially the same elements in the number of embodiments will be assigned the same reference numerals, and descriptions thereof will be omitted.

[0010] (First embodiment) A first embodiment will be described with reference to Figures 1 to 4. As shown in Figures 1 and 2, a transformer 1 as a stationary induction device includes a wound core 10, a plurality of coils 20 (three in the case of multiple coils), an upper support member 31, a lower support member 32, and an auxiliary member 40. The transformer 1 is used by being enclosed in a container (not shown) together with insulating oil, for example.

[0011] The wound core 10 includes an upper yoke portion 11, a lower yoke portion 12, and a plurality of (three in this case) leg portions 13. The upper yoke portion 11 and the lower yoke portion 12 extend horizontally, or in the left-right direction in this case. The leg portions 13 extend vertically between the upper yoke portion 11 and the lower yoke portion 12, connecting the upper yoke portion 11 and the lower yoke portion 12. The wound core 10 is formed by winding a thin strip-shaped member 100 of amorphous metal multiple times. The thickness of the strip-shaped member 100 can be set, for example, within a range of 0.02 mm to 0.03 mm, preferably within a range of 0.023 mm to 0.025 mm.

[0012] Wound core 10 is configured to include two inner wound cores 14 and one outer wound core 15. The two inner wound cores 14 are arranged side by side to the left and right of each other. The outer wound core 15 is arranged on the outer periphery so as to surround the two inner wound cores 14. Each of inner wound core 14 and outer wound core 15 is configured in a rectangular ring shape with rounded corners.

[0013] Coil 20 has a cylindrical shape overall and is attached to the outer periphery of each of the three legs 13 of wound core 10. As shown in FIG. 1, coil 20 includes a low-voltage winding 21 and a high-voltage winding 22. Low-voltage winding 21 is disposed on the inner periphery of coil 20. As shown in FIG. 3, bobbin 23 is disposed on the inner periphery of low-voltage winding 21. That is, low-voltage winding 21 is wound around bobbin 23. Bobbin 23 is formed by shaping a high-strength insulating member, such as pressboard made by compressing paper, into a cylindrical shape. High-voltage winding 22 is wound around low-voltage winding 21 and disposed on the outer periphery of coil 20.

[0014] As shown in FIG. 4, the coil 20 is formed by stacking and winding a winding wire 201, which is an electric wire such as a rectangular wire, and a sheet-like insulating member 202. The upper and lower ends of the insulating member 202 protrude upward and downward beyond the upper and lower ends of the winding wire 201. The insulating member 202 can be made of, for example, electrical insulating paper or coil insulating paper. The bobbin 23 is thicker and more rigid than the sheet-like insulating member 202. As shown in FIG. 3, spacers 24 are arranged in a circumferential direction between the low-voltage winding wire 21 and the high-voltage winding wire 22, forming ducts 25 that serve as passages for refrigerants such as insulating oil. Furthermore, although not shown, spacers are also arranged in a circumferential direction at appropriate positions between the winding layers of the low-voltage winding wire 21 and the high-voltage winding wire 22 to form ducts. The spacers 24 are made of an insulating member such as wood and have a rectangular column shape, extending parallel to the axial direction of the coil 20.

[0015] As shown in FIG. 3 , the coil 20 includes a first straight portion 26, a second straight portion 27, and a corner portion 28. The first straight portion 26 is a portion sandwiched between the legs 13 in the direction in which the legs 13 are arranged, i.e., the left-right direction, and the electric wire extends straight in the depth direction. The second straight portion 27 is disposed outside the legs 13 in the depth direction, and the electric wire extends straight in the left-right direction. The corner portion 28 is a portion connecting the first straight portion 26 and the second straight portion 27, and has a curvature that bends around the axis of the coil 20. The corner portion 28 is connected to both ends of the first straight portion 26 in the depth direction. Compared to the first straight portion 26 or the second straight portion 27, in which the multiple winding layers extend straight and parallel to each other, the corner portion 28, in which the multiple winding layers are curved parallel to each other, is configured to have higher rigidity.

[0016] As shown in FIG. 2, the upper support member 31 is configured in a downward U-shape when viewed from the side. The upper support member 31 clamps and fixes the upper yoke portion 11 horizontally, in this case from the front-to-rear direction. The lower support member 32 is configured in an upward U-shape when viewed from the side. The lower support member 32 clamps and fixes the lower yoke portion 12 horizontally, in this case from the front-to-rear direction. The lower support member 32 also has a flange portion 321 that protrudes in the front-to-rear direction from the upper edge of the U-shape and extends horizontally. The flange portion 321 has the function of supporting the weight of the coil 20 and maintaining its shape. The upper support member 31 and the lower support member 32 are made of, for example, steel.

[0017] The auxiliary members 40 are inserted between the upper yoke portion 11 and the coil 20, and between the lower yoke portion 12 and the coil 20. The auxiliary members 40 above the coil 20 may be referred to as the upper auxiliary members 40, and the auxiliary members 40 below the coil 20 may be referred to as the lower auxiliary members 40. When there is no need to distinguish between the upper and lower auxiliary members 40, they will be collectively referred to as the auxiliary members 40.

[0018] The auxiliary member 40 has a surface that extends horizontally, i.e., a surface that is perpendicular to the axial direction of the coil 20, and has the function of supporting the weight of the coil 20 with that surface. The auxiliary member 40 is made of a sheet-like insulating material such as pressboard.

[0019] 2, the depth direction length dimension D1 of the auxiliary member 40 is set to be longer than the depth direction length dimension D0 of the leg portion 13. That is, both end portions 41 of the auxiliary member 40 in the depth direction protrude beyond both end portions 131 of the leg portion 13 in the depth direction. Furthermore, the depth direction length dimension D1 of the auxiliary member 40 is set to be equal to or less than the distance D2 between both end portions of the flange portion 321.

[0020] 3, the auxiliary member 40 is arranged so as to overlap at least the first straight portion 26 of the high-voltage winding 22 and at least a portion of the corner portion 28 of the high-voltage winding 22. As a result, the upper auxiliary member 40 can distribute the weight of the wound core 10 to the corner portion 28, which has higher rigidity than the first straight portion 26, and the lower auxiliary member 40, together with the flange portion 321, can support the weight of the wound core 10 and coil 20 at the rigid corner portion 28.

[0021] Furthermore, since a wide area of ​​the coil 20 is covered by the upper auxiliary member 40, there is an effect that foreign matter is less likely to fall below the coil 20 during maintenance of the transformer 1, for example.

[0022] The transformer 1 as the stationary induction device of this embodiment described above includes a wound core 10, a coil 20, and an auxiliary member 40. The wound core 10 is formed by winding a strip-shaped member 100 made of amorphous metal, and has a plurality of legs 13 between an upper yoke portion 11 and a lower yoke portion 12. The coil 20 has a winding 201 wound around the plurality of legs 13. The auxiliary member 40 is formed of an insulating member, and is disposed between the upper yoke portion 11 and the lower yoke portion 12 and the coil 20. Both end portions 41 of the auxiliary member 40 in the depth direction, which is a direction perpendicular to the direction in which the plurality of legs 13 are arranged, protrude outward in the depth direction beyond both end portions 131 of the plurality of legs 13.

[0023] As a result, the upper auxiliary member 40 supports the weight of the wound core 10 over a surface area wider than the portion of the coil 20 sandwiched between the upper and lower yoke portions 11, 12, making it possible to distribute the weight of the coil 20. Furthermore, because the lower auxiliary member 40 supports the coil 20 over a wide area, the load of the upper yoke portion 11 and the coil 20 is easily distributed and transmitted without concentrating on a single portion of the lower yoke portion 12. Therefore, the auxiliary member 40 can suppress excessive stress, particularly on the corners of the wound core 10, and reduce loss deterioration. Furthermore, the auxiliary member 40 functions as an insulating member provided between the upper and lower yoke portions 11, 12 and the coil 20, making it possible to strengthen the support structure of the wound core with an inexpensive configuration without increasing the number of parts or labor.

[0024] The transformer 1 includes a lower support member 32 that sandwiches and fixes the lower yoke portion 12. The lower support member 32 has a flange portion 321 that protrudes in the depth direction and extends horizontally.

[0025] According to this, the load received by the auxiliary member 40 is supported by the flange portion 321, thereby reducing the load applied to the lower yoke portion 12 and thereby suppressing the stress applied to the corner portions, thereby reducing loss deterioration.

[0026] Coil 20 includes a straight portion, in this case first straight portion 26, that is sandwiched between leg portions 13 and extends in the depth direction, and corner portions 28 that are arranged on both sides of first straight portion 26 in the winding direction of coil 20 and bend in directions away from first straight portion 26. Auxiliary member 40 is arranged so as to overlap at least a portion of first straight portion 26 and at least a portion of corner portion 28.

[0027] According to this, the rigidity of the corner portion 28 is higher than that of the first straight portion 26, so that the load of the upper yoke portion 11 can be supported by the highly rigid portion of the coil 20, or the highly rigid portion of the coil 20 can be supported by the auxiliary member 40, thereby making it possible to support the wound core 10 more stably.

[0028] (Second embodiment) A second embodiment will be described with reference to Fig. 5. A transformer 1 of this embodiment includes an auxiliary member 40a instead of the auxiliary member 40.

[0029] The auxiliary member 40a is arranged in the first straight portion 26 so as to overlap in the vertical direction with at least a portion of both the low-voltage winding 21 and the high-voltage winding 22. In this embodiment, the auxiliary member 40a is arranged so as to overlap in the vertical direction with at least a portion of the bobbin 23. The bobbin 23 has higher rigidity than the coil 20, and can therefore support the wound core 10 more stably.

[0030] This embodiment also provides the same effects as the above embodiment.

[0031] The coil 20 of the transformer 1 as the stationary induction device of this embodiment has a cylindrical bobbin 23 around which the winding 201 is wound, the bobbin 23 having higher rigidity than the winding 201. The auxiliary member 40a is arranged so as to overlap at least a portion of the bobbin 23 in the vertical direction.

[0032] The bobbin 23 needs to have a certain level of rigidity so that it does not deform when the winding 201 is wound around it. By supporting the wound core 10 with the highly rigid bobbin 23 via the auxiliary member 40a, the wound core 10 can be supported even more reliably.

[0033] (Third embodiment) A third embodiment will be described with reference to Fig. 6. A transformer 1 of this embodiment includes an auxiliary member 40b instead of the auxiliary member 40.

[0034] Auxiliary member 40b is disposed so as to overlap at least a portion of corner portion 28 of each of low-voltage winding 21 and high-voltage winding 22. In other words, auxiliary member 40a overlaps at least a portion of corner portion 28 in the vertical direction across both low-voltage winding 21 and high-voltage winding 22.

[0035] Furthermore, auxiliary member 40b is arranged in first straight portion 26 so as to overlap both low-voltage winding 21 and high-voltage winding 22 in the vertical direction. In this embodiment, auxiliary member 40b is arranged so as to overlap at least a portion of bobbin 23 in the vertical direction.

[0036] This embodiment also provides the same effects as the above-described embodiments.

[0037] (Fourth embodiment) A fourth embodiment will be described with reference to Figures 7 to 9. In this embodiment, the transformer 1 of this embodiment includes an auxiliary member 50 instead of the auxiliary member 40. The auxiliary member 50 of this embodiment is configured in multiple stages, in this case two stages, stacked in the vertical direction.

[0038] 7 and 8, the auxiliary member 50 is configured to include an outer auxiliary member 51 and an inner auxiliary member 52. The outer auxiliary member 51 is disposed closer to the outer periphery of the wound core 10 in the vertical direction. The inner auxiliary member 52 is disposed closer to the center of the wound core 10 in the vertical direction. That is, the inner auxiliary member 52 is located lower than the outer auxiliary member 51 in the upper auxiliary member 50, and is located higher than the outer auxiliary member 51 in the lower auxiliary member 50.

[0039] 8, the outer auxiliary member 51 and the inner auxiliary member 52 are arranged so that at least a portion of each of them overlaps vertically. This allows the upper auxiliary member 50 to transmit the load received by the outer auxiliary member 51 to the inner auxiliary member 52. Furthermore, the lower auxiliary member 50 allows the load received by the inner auxiliary member 52 to be transmitted to the outer auxiliary member 51.

[0040] In the direction in which leg portions 13 are arranged, that is, in the left-right direction in this case, outer auxiliary member 51 extends generally opposite the straight portions of inner wound core 14. In other words, the left-right width dimension of outer auxiliary member 51 is set to 85% or more, and preferably 95% or more, of the length of the straight portions of inner wound core 14. This allows a wider area of ​​contact with inner wound core 14, thereby dispersing the load.

[0041] The inner auxiliary member 52 is divided into multiple parts. In the present embodiment shown in Fig. 7, the inner auxiliary member 52 is divided into two parts. The left end of the left inner auxiliary member 52L is disposed to the left of the left end of the outer auxiliary member 51. The right end of the right inner auxiliary member 52R is disposed to the right of the right end of the outer auxiliary member 51. This allows the weight of the wound core 10 to be supported over as large an area as possible while avoiding the corners of the inner wound core 14.

[0042] 8, the inner auxiliary member 52 is provided at a position where it does not overlap vertically with the duct 25 between the low-voltage winding 21 and the high-voltage winding 22. Furthermore, although not shown in detail, the inner auxiliary member 52 is provided at a position where it does not overlap vertically with at least some of the multiple ducts 25 formed between the winding layers. This does not prevent the insulating oil from passing through the duct 25, thereby maintaining cooling efficiency.

[0043] The inner auxiliary member 52 is not limited to two, and may be divided into three or more. For example, in another example of this embodiment shown in FIG. 9, the inner auxiliary member 52 is divided into four. In this case, too, the left end of the left inner auxiliary member 52L is positioned to the left of the left end of the outer auxiliary member 51. The right end of the right inner auxiliary member 52R is positioned to the right of the right end of the outer auxiliary member 51. Furthermore, multiple (in this case, two) central inner auxiliary members 52C are positioned between the left inner auxiliary member 52L and the right inner auxiliary member 52R. Furthermore, the four inner auxiliary members 52L, 52R, 52C, and 52C are positioned so as not to overlap vertically with the duct 25 between the low-voltage winding 21 and the high-voltage winding 22. The four inner auxiliary members 52L, 52R, 52C, and 52C are positioned so as not to overlap vertically with at least some of the multiple ducts 25 formed between the winding layers.

[0044] The auxiliary member 50 of this embodiment is configured to include outer auxiliary members 51 and inner auxiliary members 52, which are a plurality of insulating members arranged to be partially overlapped in the vertical direction.

[0045] This allows the auxiliary members 50 to support as large an area as possible while avoiding the portions facing the inside corners of the wound core 10, so that the wound core 10 and the coils 20 are held even more reliably.

[0046] The transformer 1 includes a plurality of ducts 25 formed between the windings 201. The auxiliary members 50 include an outer auxiliary member 51 that is arranged outside the wound core 10 in the vertical direction, and an inner auxiliary member 52 that is arranged more inward of the wound core 10 than the outer auxiliary member 51 in the vertical direction. The inner auxiliary member 52 is positioned so as not to overlap at least a portion of the plurality of ducts 25 in the vertical direction.

[0047] This allows the wound core 19 and coil 20 to be supported over a wide area without the auxiliary member 50 blocking the duct 25, which serves as an oil passage for the insulating oil, thereby strengthening the support without impairing the cooling efficiency of the transformer 1.

[0048] The outer auxiliary member 51 and the inner auxiliary member 52 may be separate and separable, or may be integrally formed.

[0049] Furthermore, in each of the above embodiments, the upper auxiliary members 40, 40a, 40b, 50 and the lower auxiliary members 40, 40a, 40b, 50 may have the same shape or different shapes.

[0050] Furthermore, although the above-described embodiments are examples in which the stationary induction device is applied to a three-phase transformer, the present invention is not limited to this and may be applied to, for example, a single-phase transformer.

[0051] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0052] 1...Transformer (static induction device), 10...Wound core, 11...Upper yoke portion, 12...Lower yoke portion, 13...Leg portion, 131...Both ends, 20...Coil, 201...Winding, 202...Insulating member (sheet-shaped insulating member), 23...Bobbin, 25...Duct, 26...First straight portion (straight portion), 28...Corner portion, 31...Upper support member, 32...Lower support member, 321...Flange portion, 40...Auxiliary member, 40a...Auxiliary member, 40b...Auxiliary member, 41...Both ends, 50...Auxiliary member, 51...Outer auxiliary member, 52, 52L, 52R, 52C...Inner auxiliary member, 52L...Left-side inner auxiliary member (inner auxiliary member), 52R...Right-side inner auxiliary member (inner auxiliary member), 52C...Central inner auxiliary member (inner auxiliary member), 100...Strip-shaped member

Claims

1. a wound core formed by winding a strip-shaped member of amorphous metal and having a plurality of legs between an upper yoke portion and a lower yoke portion; a coil including a winding wound around the plurality of legs; an auxiliary member made of an insulating member and arranged between the upper yoke portion, the lower yoke portion, and the coil; Both end portions of the auxiliary member in a depth direction, which is a direction perpendicular to the direction in which the plurality of legs are arranged, protrude outward in the depth direction relative to both end portions of the plurality of legs in the depth direction. Stationary induction equipment.

2. a lower support member that sandwiches and fixes the lower yoke portion from both sides in the depth direction; The lower support member has a flange portion that protrudes in the depth direction and extends horizontally. The stationary induction device according to claim 1 .

3. the coil includes a straight portion sandwiched between the leg portions and extending in the depth direction, and corner portions disposed on both sides of the straight portion in the winding direction of the coil and curved in directions away from the straight portion, The auxiliary member is disposed so as to overlap at least a portion of the straight portion and at least a portion of the corner portion in the vertical direction. The stationary induction device according to claim 1 .

4. The coil includes a sheet-like insulating member inserted between the windings, and a cylindrical bobbin having a higher rigidity than the sheet-like insulating member and around which the windings are wound, The auxiliary member is arranged so as to overlap at least a portion of the bobbin in the vertical direction. The stationary induction device according to claim 1 .

5. The auxiliary member includes a plurality of the insulating members arranged to be partially overlapped in the vertical direction. The stationary induction device according to claim 1 .

6. a plurality of ducts formed between the windings; the auxiliary members include an outer auxiliary member that is arranged outside the wound core in the vertical direction, and an inner auxiliary member that is arranged inside the wound core with respect to the outer auxiliary member in the vertical direction, The inner auxiliary member is disposed at a position not overlapping with at least a portion of the plurality of ducts in the vertical direction. The stationary induction device according to claim 5.

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