Three-phase three-dimensional roll iron core distribution transformer oil tank

Abstract

The utility model relates to the technical field of transformers, in particular to a three-phase three-dimensional roll iron core distribution transformer oil tank which comprises a tank body internally provided with a main cavity for containing a three-phase three-dimensional roll iron core and insulating oil. The heat dissipation assembly comprises a plurality of sets of corrugated sheets arranged on the side wall of the box body in a protruding mode, and auxiliary cavities communicated with the main cavity are formed between the corrugated sheets and the box body; wherein the surface of the corrugated sheet is a continuous and smooth curved surface. According to the utility model, the corrugated sheets with continuous smooth curved surfaces are arranged, so that fatigue cracks caused by sharp angles can be prevented, and the service life is prolonged; the shape of the corrugated sheet is optimized to be suitable for different application scenes; and the heat dissipation effect on a high-temperature area in the oil tank is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an oil tank for a three-phase three-dimensional wound iron core distribution transformer. Background Art

[0002] The oil tank of a three-phase three-dimensional wound core distribution transformer is a sealed container used to house and protect the core components of the transformer (such as the three-dimensional wound core, windings, etc.), and has functions such as heat dissipation, insulation, and mechanical support. The heat generated by the windings and core is transferred to the tank wall through the circulation of transformer oil (natural or forced), and then dissipated to the environment through heat sinks or corrugated plates. Among them, the three-phase three-dimensional wound core is mostly an equilateral triangle structure, which includes three core units with the same structure. Each core unit includes an upper and lower iron yoke facing each other, and a left and right core column facing each other. Each core unit is connected to the other two core units through its left and right core columns, and the winding is arranged outside the connected left and right core columns.

[0003] A common type of oil tank heat dissipation method is a corrugated tank, where the tank walls are extruded into a corrugated shape, which promotes oil circulation through expansion and contraction. However, long-term oil temperature fluctuations cause the corrugated plates to repeatedly expand and contract, resulting in metal fatigue and potentially initiating microcracks. Existing corrugated plates, in particular, have sharp angles at their bends (e.g., crests and troughs), which are more susceptible to stress concentration and fatigue cracking, shortening their service life. Furthermore, due to the inconsistent thermal expansion of different parts of the tank, such as the higher temperatures in the winding area, fatigue cracking is particularly prominent. Utility Model Content

[0004] Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the utility model.

[0005] In order to solve the deficiencies of the prior art, one object of the present invention is to provide a three-phase three-dimensional wound iron core distribution transformer oil tank.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions: a three-phase three-dimensional wound iron core distribution transformer oil tank, comprising:

[0007] The box body has a main chamber for accommodating a three-phase three-dimensional wound iron core and insulating oil; and

[0008] A heat dissipation assembly comprising a plurality of groups of corrugated sheets protruding from the side wall of the box, wherein a secondary chamber communicating with the main chamber is provided between the corrugated sheets and the box;

[0009] Wherein, the surface of the corrugated sheet is a continuous and smooth curved surface.

[0010] As a preferred solution of the three-phase three-dimensional wound iron core distribution transformer oil tank of the utility model, the connection between the corrugated sheet and the side wall of the box body is transitioned by a first rounded surface.

[0011] As a preferred solution of the three-phase three-dimensional wound iron core distribution transformer oil tank of the utility model, wherein: the corrugated sheet includes a first side plate and a second side plate that are symmetrically distributed, and a connecting plate connected between the first side plate and the second side plate, and the secondary chamber is formed between the first side plate, the second side plate and the connecting plate;

[0012] There is a continuous and smooth curved surface transition between the first side plate and the connecting plate, and between the second side plate and the connecting plate.

[0013] As a preferred solution of the three-phase three-dimensional wound core distribution transformer oil tank of the utility model, the first side plate and the connecting plate, as well as the second side plate and the connecting plate are transitioned by a second rounded surface.

[0014] As a preferred solution of the three-phase three-dimensional wound iron core distribution transformer oil tank of the utility model, the surfaces of the first side panel and the second side panel are both flat, and the angle C formed between the first side panel, the second side panel and the connected box side wall is 90°.

[0015] As a preferred solution of the three-phase three-dimensional wound iron core distribution transformer oil tank of the utility model, the surfaces of the first side panel and the second side panel are both flat, and the angle C formed between the first side panel, the second side panel and the connected box side wall is greater than 90°.

[0016] As a preferred solution of the three-phase three-dimensional wound core distribution transformer oil tank of the utility model, wherein: the cross-sectional profile of the corrugated sheet is a sine wave shape, and the sine curve expression is: y=

[0017] Asin(x / λ);

[0018] The first side plate has the same waveform shape as x in the interval (-0.5π+2kπ, 2kπ);

[0019] The second side plate has the same waveform shape as x in the interval (π+2kπ, 1.5π+2kπ);

[0020] The connecting plate has the same waveform shape as x in the interval (2kπ, π+2kπ);

[0021] Where A is the amplitude, λ is the wavelength, and k is an integer.

[0022] As a preferred solution of the three-phase three-dimensional wound core distribution transformer oil tank of the utility model, wherein: the side wall of the box body includes three groups of long walls of equal length and angles of 60 degrees, and short walls connected between adjacent long walls and adapted to the winding area;

[0023] Wherein, corrugated sheets are provided on both the long wall and the short wall.

[0024] As a preferred solution of the three-phase three-dimensional wound core distribution transformer oil tank of the utility model, the spacing D1 between adjacent groups of corrugated sheets gradually decreases from the long wall to the short wall.

[0025] As a preferred solution of the three-phase three-dimensional wound core distribution transformer oil tank of the utility model, the distance D2 between the first side plate and the second side plate of adjacent groups of corrugated sheets satisfies: gradually decreasing from the long wall to the short wall.

[0026] The utility model has the following beneficial effects: the utility model has a corrugated sheet with a continuous smooth curved surface, which can prevent fatigue cracks caused by sharp corners and extend the service life; the shape of the corrugated sheet is optimized to be suitable for different application scenarios; and the heat dissipation effect of the high-temperature area in the oil tank is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the oil tank of the three-phase three-dimensional wound iron core distribution transformer of the present invention.

[0029] Figure 2 This is a schematic diagram of the top cross-sectional structure of the oil tank of the three-phase three-dimensional wound iron core distribution transformer of the utility model.

[0030] Figure 3 For this utility model Figure 2 An enlarged schematic diagram of the structure at E is shown.

[0031] Figure 4 This is a schematic diagram of the distribution structure of the cross-sectional profile of the corrugated sheet of the present invention when the angle C is 90°.

[0032] Figure 5 For this utility model Figure 4 A detailed enlarged schematic diagram of the cross-sectional structure of a single corrugated sheet is shown.

[0033] Figure 6 This is a schematic diagram of the distribution structure of the cross-sectional profile of the corrugated sheet of the present invention when the included angle C is greater than 90°.

[0034] Figure 7 For this utility model Figure 6 An enlarged schematic diagram of the structure at point B is shown.

[0035] Figure 8 This is a schematic diagram of the distribution structure of the corrugated sheet of the present invention when the cross-sectional profile is a sine wave shape.

[0036] Figure 9 The utility model is a schematic top view of the cross-sectional structure of the three-phase three-dimensional wound core distribution transformer oil tank loaded with the three-phase three-dimensional wound core.

[0037] Figure 10 This is a schematic top view of the cross-sectional structure of the oil tank of the three-phase three-dimensional wound iron core distribution transformer of the utility model when the spacing between adjacent groups of corrugated sheets is reduced.

[0038] In the figure: 100, box body; 101, main chamber; 102, long wall; 103, short wall; 200, heat dissipation component; 201, corrugated sheet; 201a, first side plate; 201b, second side plate; 201c, connecting plate; 202, sub-chamber; 203, reinforcing rod; 300, three-phase three-dimensional wound core; 400, winding area; Ra1, first rounded surface; Ra2, second rounded surface. DETAILED DESCRIPTION

[0039] In order to make the objectives, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0042] Example 1

[0043] Reference Figure 1 、 Figure 2 and Figure 9, which is the first embodiment of the present utility model, provides a three-phase three-dimensional wound iron core distribution transformer oil tank, which can achieve the effect of reducing fatigue cracks, and includes: a box body 100 and a heat dissipation assembly 200.

[0044] Specifically, the box 100 has a main chamber 101 for accommodating the three-phase three-dimensional wound core 300 and insulating oil. The heat generated by the three-phase three-dimensional wound core 300 is transferred to the oil in the main chamber 101, and the heat is dissipated by cooling the oil.

[0045] Furthermore, the heat dissipation assembly 200 includes multiple groups of corrugated sheets 201 protruding from the sidewalls of the housing 100. A secondary chamber 202, connected to the main chamber 101, is defined between the corrugated sheets 201 and the housing 100. The corrugated sheets 201 are generally sheet-like structures with uniform wall thickness. They are not flat plates, but rather have a recessed interior. The corrugated sheets 201 can be integrally formed with the housing 100, or welded to form a secondary chamber 202 between them. This secondary chamber 202 communicates with the main chamber 101 to ensure fluid flow. To enhance the mechanical strength of the corrugated sheets 201, the multiple groups of corrugated sheets 201 can be connected by reinforcing rods 203.

[0046] During operation, the oil in the main chamber 101 carries heat and flows into the secondary chamber 202, thereby increasing the contact area between the oil and the outer wall and dissipating heat. The corrugated sheets 201 themselves can expand and contract to adapt to changes in the internal oil temperature. Multiple groups of corrugated sheets 201 are arranged on the side walls of the housing 100 to improve heat dissipation efficiency and increase the oil storage capacity.

[0047] The surface of the corrugated sheet 201 is a continuously smooth curved surface. It's worth noting that the term "continuously smooth" here doesn't necessarily imply an absolutely smooth surface; in reality, absolutely smooth surfaces don't exist. This is to indicate that the surface of the corrugated sheet 201 lacks right angles, oblique angles, or sharp points. This is equivalent to the cross-sectional profile of the corrugated sheet 201 being a curve that is "differentiable" at any position, thus meeting the mathematical definition of a "continuously smooth curve." This arrangement offers the advantage of continuously varying the curvature of the curve within the same cross-sectional profile of the corrugated sheet 201, mitigating sudden local stress changes and achieving a more uniform stress distribution.

[0048] Optionally, the connection between the corrugated sheet 201 and the side wall of the box body 100 is transitioned by a first rounded surface Ra1. Chamfering is a common method for removing sharp corners. The first rounded surface Ra1 formed by chamfering makes the connection between the corrugated sheet 201 and the side wall of the box body 100 also a smooth transition, thereby delaying fatigue cracks in the connection.

[0049] Example 2

[0050] Reference Figure 1-Figure 3 、 Figure 9 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a first side plate 201a, a second side plate 201b and a connecting plate 201c, and the sub-chamber 202 is formed between the first side plate 201a, the second side plate 201b and the connecting plate 201c.

[0051] Specifically, the corrugated sheet 201 includes a symmetrically distributed first side plate 201a and a second side plate 201b, and a connecting plate 201c connected between the first and second side plates 201a, 201b. The symmetrical distribution of the first and second side plates 201a, 201b on either side of the secondary chamber 202 ensures uniform oil flow and similar heat dissipation on both sides. The transitions between the first and second side plates 201a, 201c, and between the second and second side plates 201b, 201c, are both continuous and smooth curved surfaces. Since a plane is a surface with zero curvature, it serves as a special type of curved surface. Therefore, the first and second side plates 201a, 201b, and connecting plate 201c can all be flat, but their respective connections must be connected by curved surfaces. This ensures that the surface curvature remains continuously variable, without sharp corners where stress concentration occurs.

[0052] It is worth noting that the first side panel 201a, the second side panel 201b, and the connecting panel 201c herein are described in relative terms. In some cases, the first side panel 201a, the second side panel 201b, and the connecting panel 201c may be configured as an integrally connected structure. In this case, portions of the two sides thereof may be respectively considered the first side panel 201a and the second side panel 201b, while the connecting portion between the first side panel 201a and the second side panel 201b may be considered the connecting panel 201c.

[0053] Furthermore, the transition between the first side panel 201a and the connecting panel 201c, as well as between the second side panel 201b and the connecting panel 201c, is formed by a second rounded surface Ra2. Similarly, the rounded second rounded surface Ra2 has the advantage of being easy to process. For example, in this embodiment, the first side panel 201a, the second side panel 201b, and the connecting panel 201c are formed by bending, and the second rounded surface Ra2 is formed at the bend.

[0054] The rest of the structure is the same as that of Example 1.

[0055] Example 3

[0056] Reference Figure 1-Figure 5 、 Figure 9 , which is the third embodiment of the present utility model. Different from the previous embodiment, in this embodiment, the surfaces of the first side panel 201a and the second side panel 201b are both flat. The flat-shaped first side panel 201a and the second side panel 201b are easy to process, with small cutting loss, high plate utilization rate, and high production efficiency.

[0057] Specifically, the angle C formed between the first side plate 201a, the second side plate 201b and the side wall of the box body 100 is 90 degrees. That is, the secondary chamber 202 formed between the first side plate 201a, the second side plate 201b and the connecting plate 201c is approximately rectangular.

[0058] The right-angle structure formed between the first and second side panels 201a, 201b, and the housing 100 provides more stable support. The connection is rounded, allowing for easy forming on a press brake, resulting in low production costs. However, a disadvantage is that plastic strain accumulates rapidly at the right angles, resulting in a weak ultimate deformation capacity. Furthermore, the orientation of the first and second side panels 201a, 201b relative to the housing 100 is identical to the direction in which the oil flows from the main chamber 101 into the secondary chamber 202, hindering turbulent circulation and heat dissipation of the oil. In particular, the curvature of the first and second side panels 201a, 201b transitioning to the connecting plate 201c varies significantly, resulting in uneven stress distribution during thermal expansion.

[0059] The rest of the structure is the same as that of Example 2.

[0060] Example 4

[0061] Reference Figure 1-Figure 7 、 Figure 9 This is the fourth embodiment of the present invention. Unlike the previous embodiment, the surfaces of the first side panel 201a and the second side panel 201b are both planar, but the angle C formed between the first and second side panels 201a, 201b and the connected sidewalls of the housing 100 is greater than 90°. In other words, the sub-chamber 202 formed between the first and second side panels 201a, 201b, and the connecting plate 201c is approximately trapezoidal in shape, and the spacing between the first and second side panels 201a, 201b gradually decreases from the main chamber 101 toward the sub-chamber 202, thereby accommodating thermal expansion and deformation.

[0062] The oil barrier provided by the first and second side panels 201a, 201b, promotes turbulent circulation within the oil, facilitating heat dissipation. Furthermore, the trapezoidal corrugated sheet 201 exhibits greater deformation capacity than a rectangular structure, making fabrication similarly simple. However, a drawback is that while the difference in curvature between the first and second side panels 201a, 201b and the connecting plate 201c is somewhat less pronounced than with a rectangular structure, the uneven stress distribution during thermal expansion creates greater resistance to the oil in the sub-chamber 202 of the same volume than with a rectangular structure, impacting the oil circulation rate. Therefore, the angle C should be kept relatively small, with a preferred range of 80 to 90°.

[0063] The rest of the structure is the same as that of Example 2.

[0064] Example 5

[0065] Reference Figures 1-10 , which is the fifth embodiment of the present utility model. Different from the previous embodiment, this embodiment provides a sinusoidal-wave-shaped corrugated sheet 201, which ensures uniform stress distribution without significantly affecting the oil circulation flow rate.

[0066] Specifically, the cross-sectional profile of the corrugated sheet 201 is a sine wave shape, and the sine curve expression is: y = Asin (x / λ), which is the well-known sine function formula;

[0067] like Figure 8 As shown, the first side plate 201a has a waveform shape consistent with the waveform shape when x is in the range of (-0.5π+2kπ, 2kπ), the second side plate 201b has a waveform shape consistent with the waveform shape when x is in the range of (π+2kπ, 1.5π+2kπ), and the connecting plate 201c has a waveform shape consistent with the waveform shape when x is in the range of (2kπ, π+2kπ). Where λ is the wavelength, which in this embodiment represents the maximum distance between the first side plate 201a and the second side plate 201b, and is also the distance between adjacent corrugated sheets 201; k is an integer, and A is the amplitude, which represents the maximum distance from the side wall of the box body 100 to the connecting plate 201c, which is 2A in this embodiment.

[0068] The sinusoidal corrugated sheet 201 has a stable curvature profile, a low stress concentration factor, significantly improved fatigue life, and minimal resistance to oil circulation. Its disadvantage is that it requires hydraulic forming or CNC roll forming, which increases processing costs. However, the current processing technology is relatively mature and suitable for applications with high fatigue life requirements. This structural shape reduces stiffness, so stronger sheet materials can be used. Finite element analysis determined that the optimal amplitude to wavelength ratio A / λ is between 1.2 and 1.6, which balances heat dissipation and stiffness.

[0069] The rest of the structure is the same as that of Example 2.

[0070] Example 6

[0071] Reference Figures 1-10 , which is the sixth embodiment of the present utility model. Different from the previous embodiment, this embodiment provides three groups of long walls 102 and short walls 103, which correspond to the shape of the three-phase three-dimensional wound iron core 300 in the main chamber 101, wherein the three cores of the three-phase three-dimensional wound iron core 300 are respectively adapted to the three long walls 102, and the winding area 400 at the connection between adjacent iron cores is adapted to the short wall 103.

[0072] Specifically, the sidewalls of the housing 100 include three sets of long walls 102 of equal length and each with a 60° angle, and short walls 103 connected between adjacent long walls 102 and adapted to the winding area 400. By providing multiple sets of corrugated sheets 201 on both the long walls 102 and the short walls 103, the total heat dissipation area is increased.

[0073] Furthermore, the spacing D1 between adjacent groups of corrugated sheets 201 gradually decreases from the long wall 102 toward the short wall 103. Since the short wall 103 is closer to the winding area 400, and this area is the connection point between adjacent cores, the heat dissipated in this area is higher. Therefore, the corrugated sheets 201 near this area can be arranged more densely. When the same plate material is consumed, by rationally adjusting the distribution of the corrugated sheets 201, the heat dissipation efficiency in this area can be maximized.

[0074] Preferably, the spacing D1 between adjacent groups of corrugated sheets 201 can be in the form of an arithmetic progression or a geometric progression, such as Figure 10 As shown in the figure, the corrugated sheets 201 are gradually denser from the middle area of ​​the long wall 102 to the areas on both sides close to the short walls 103 in the direction F, and the variation trend of the spacing D1 is stable. In this way, the distribution of the corrugated sheets 201 on both sides of the long wall 102 is the same, the heat dissipation effect is stable, and the heat dissipation efficiency changes steadily from the long wall 102 to the short wall 103.

[0075] The rest of the structure is the same as that of Example 2.

[0076] Example 7

[0077] Reference Figures 1-10 This is the seventh embodiment of the present invention. Unlike the previous embodiment, in this embodiment, the spacing D2 between the first side plates 201a and the second side plates 201b of adjacent groups of corrugated sheets 201 satisfies the requirement of gradually decreasing from the long wall 102 toward the short wall 103. By reducing the spacing D2 between the first side plates 201a and the second side plates 201b, the contact area between the oil in the secondary chamber 202 and the outer wall is increased, thereby improving the heat dissipation effect.

[0078] Preferably, D1 and D2 can be simultaneously reduced from the long wall 102 toward the short wall 103. If a sinusoidal corrugated sheet 201 is used, both D1 and D2 can be considered as λ. The gradual reduction of the wavelength λ can be confirmed based on the heat distribution curve of the three-phase three-dimensional wound core 300. This curve formula can be obtained through experimental measurement. By adjusting D1 and D2 synchronously based on the changing trend of the heat curve, the heat dissipation effect can be more accurately adjusted.

[0079] The rest of the structure is the same as that of Example 6.

[0080] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A three-phase three-dimensional wound iron core distribution transformer oil tank, characterized by: include, The box (100) has a main chamber (101) therein for accommodating a three-phase three-dimensional wound iron core (300) and insulating oil; and A heat dissipation assembly (200) comprising a plurality of groups of corrugated sheets (201) protruding from the side wall of a housing (100), wherein a secondary chamber (202) communicating with a main chamber (101) is provided between the corrugated sheets (201) and the housing (100); Wherein, the surface of the corrugated sheet (201) is a continuous and smooth curved surface.

2. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 1, characterized in that: The connection between the corrugated sheet (201) and the side wall of the box body (100) is transitioned by a first rounded surface (Ra1).

3. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 1 or 2, characterized in that: The corrugated sheet (201) comprises a first side plate (201a) and a second side plate (201b) that are symmetrically distributed, and a connecting plate (201c) connected between the first side plate (201a) and the second side plate (201b); the secondary chamber (202) is formed between the first side plate (201a), the second side plate (201b), and the connecting plate (201c); There is a transition between the first side plate (201a) and the connecting plate (201c), as well as between the second side plate (201b) and the connecting plate (201c) by a continuous and smooth curved surface.

4. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 3, characterized in that: The first side plate (201a) and the connecting plate (201c), as well as the second side plate (201b) and the connecting plate (201c), are both transitioned by a second rounded surface (Ra2).

5. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 4, characterized in that: The surfaces of the first side panel (201a) and the second side panel (201b) are both plane, and the angles C formed between the first side panel (201a), the second side panel (201b) and the side walls of the connected box (100) are both 90°.

6. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 4, characterized in that: The surfaces of the first side panel (201a) and the second side panel (201b) are both plane, and the angles C formed between the first side panel (201a), the second side panel (201b) and the connected side walls of the box body (100) are all greater than 90°.

7. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 3, characterized in that: The cross-sectional profile of the corrugated sheet (201) is in the shape of a sine wave, and the expression of the sine curve is: y=Asin(x / λ); The first side plate (201a) is consistent with the waveform shape of x in the interval (-0.5π+2kπ, 2kπ); The second side plate (201b) has the same waveform shape as x in the interval (π+2kπ, 1.5π+2kπ); The connecting plate (201c) has the same waveform shape as x in the interval (2kπ, π+2kπ); Where A is the amplitude, λ is the wavelength, and k is an integer.

8. The three-phase three-dimensional wound core distribution transformer oil tank according to any one of claims 5 to 7, characterized in that: The side walls of the box (100) include three groups of long walls (102) of equal length and with an included angle of 60°, and short walls (103) connected between adjacent long walls (102) and adapted to the winding area (400); Wherein, corrugated sheets (201) are provided on both the long wall (102) and the short wall (103).

9. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 8, characterized in that: The spacing D1 between adjacent groups of corrugated sheets (201) gradually decreases from the long wall (102) to the short wall (103).

10. The three-phase three-dimensional wound iron core distribution transformer oil tank according to claim 8, characterized in that: The spacing D2 between the first side plates (201a) and the second side plates (201b) of adjacent groups of corrugated sheets (201) satisfies the requirement of gradually decreasing from the long wall (102) to the short wall (103).

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