Riser base for power transformers and power transformer

Abstract

The present invention provides a riser for a power transformer and a power transformer, wherein the riser has a top wall, a first longitudinal side wall, a second longitudinal side wall, a first transverse side wall, a second transverse side wall, and an inclined open bottom of the riser; the riser has a partition extending from the second transverse side wall toward the first transverse side wall in parallel with the top wall. The partition is formed with an opening corresponding to the output end of the power transformer and passing through the partition, wherein the cross section of one of the openings is elliptical, and the cross section of the other openings is circular. The riser has a first heat dissipation fin and a second heat dissipation fin, and the first heat dissipation fin and the second heat dissipation fin are configured to guide oil so that the oil flows around the opening and finally flows into the oil collecting pipe. In order to cool the bushing lead-out surface by natural oil circulation, a three-phase asymmetric bushing oil hole, a beveled angle structure, and a built-in heat dissipation fin and oil collecting pipe structure are used in the riser of the present invention, so as to take away the heat in time to avoid overheating.

Description

Technical Field

[0001] The invention relates to a raised seat for a power transformer and a power transformer. Background Art

[0002] Usually, local overheating of large current risers is a bottleneck in their design, where the magnetic field environment of the bushing is complex, the loss is high, and the possibility of heat generation is very high. The corresponding products are usually cooling mechanisms with forced oil circulation. Under this cooling condition, the oil flow rate is high and the immobile layer on the surface of the component is very thin. Moreover, the horizontal plate of the riser can also achieve very good cooling effect at high flow rate. However, if the customer requires that the power transformer be cooled by natural oil circulation at certain capacities, the oil mainly uses reliable convection for heat exchange. The conventional riser structure will not be able to meet the requirements, and its horizontal plate is prone to overheating at this stage.

[0003] The conventional solution is to route the wires out of the power transformer bushing from the side wall, separating the surface with greater losses from the surface with more difficult heat dissipation, but this solution is relatively complex to coordinate with the external leads.

[0004] There is an urgent need for a power transformer riser that can lead out wires from the top and avoid heat generation during the natural oil circulation stage. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to cool the lead-out surface of the sleeve by natural oil circulation.

[0006] For this reason, the measures taken by the present invention are:

[0007] The present invention keeps the surface of the casing pipe still horizontal, and cooperates with the following structures to ensure its heat dissipation capacity in the natural oil circulation stage:

[0008] 1. The three-phase asymmetric bushing oil holes increase the oil flow in the middle phase bushing area;

[0009] 2. Beveled corner structure to prevent dead oil areas in corners;

[0010] 3. Built-in oil collecting pipe structure, with a small number of outlets on the outside of the oil collecting pipe, which can efficiently guide hot oil into the radiator;

[0011] 4. There are oil holes of different sizes on the inside of the oil collecting pipe to drain the hot oil in the key area reasonably;

[0012] 5. The oil ports inside and outside the oil collecting pipe are staggered, which can form oil flow inside the oil collecting pipe to prevent overheating of the corner of the lifting seat;

[0013] 6. Heat dissipation fin structures are arranged inside and outside to increase the heat dissipation area of ​​key areas;

[0014] 7. Adjust the angle of the heat sink and arrange it into an oil guiding structure.

[0015] The advantages of adopting the above structure are:

[0016] 1. Ensure that the low-pressure pipe passes through the top, which makes cooperation with some customers easy.

[0017] 2. Since the three-phase heating is asymmetric, the three-phase asymmetric structure is more scientific;

[0018] 3. Use the built-in oil baffle structure to perform the oil guiding function.

[0019] To this end, according to one aspect of the present invention, the present invention provides a riser for an electric transformer, characterized in that the riser has an internal space, a top wall extending in a plane defined by a first direction and a second direction, a first longitudinal end wall extending in a plane defined by the second direction and a third direction perpendicular to the second direction, a second longitudinal end wall extending parallel to the first longitudinal end wall, a first lateral side wall extending in a plane defined by the first direction and a third direction perpendicular to the first direction, and a second lateral side wall parallel to the first lateral side wall, the first lateral side wall having a first main body portion and a first extension portion inclined relative to the plane defined by the first direction and the third direction, the second lateral side wall having a second main body portion and a second extension portion inclined relative to the plane defined by the first direction and the third direction, the size of the main body portion of the first lateral side wall being larger than the size of the main body portion of the second lateral side wall, and the first extension portion and the second extension portion being inclined in the same direction relative to the plane defined by the first direction and the third direction so as to be connected together with the first longitudinal end wall and the second longitudinal end wall to jointly define the bottom opening of the riser.

[0020] The raised seat has an oil collecting pipe located at the intersection of the second transverse side wall and the top wall and extending in the first direction and passing through the raised seat.

[0021] Furthermore, the raised seat has a partition extending from the second lateral side wall toward the first lateral side wall (1c) in parallel with the top wall, the partition is formed with an opening corresponding to the output end of the power transformer and passing through the partition, the openings are arranged along the first direction, the cross-section of one of the openings is elliptical, and the cross-section of the other openings is circular.

[0022] Furthermore, a top wall of the elevation seat has two first heat dissipation fins extending toward the interior space of the elevation seat on a side facing the interior space of the elevation seat, and a first lateral side wall of the elevation seat has a plurality of second heat dissipation fins extending toward the interior space of the elevation seat on a side facing the interior space of the elevation seat, and the first heat dissipation fins and the second heat dissipation fins are constructed to guide oil so that the oil flows around the opening having an elliptical cross-section and finally flows into the oil collecting pipe.

[0023] According to a preferred embodiment of the present invention, the cross section of the oil collecting pipe is in a hollow rectangular shape.

[0024] According to a preferred embodiment of the present invention, the oil collecting pipe has a plurality of openings communicating with the inner space of the raised seat on a side facing the inner space of the raised seat.

[0025] According to a preferred embodiment of the present invention, the raised seat has a chamfered structure at the intersection of the first transverse side wall and the top wall, which is formed by a wall obliquely intersecting the top wall and the first transverse side wall.

[0026] According to a preferred embodiment of the present invention, the distance between the two first heat dissipating fins on the top wall of the elevated seat gradually decreases toward the second lateral side wall in the second direction.

[0027] According to one aspect of the present invention, there is provided a power transformer, comprising a main body and a raised seat defined according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0029] Figure 1 is a perspective isometric view of a riser for a power transformer according to the present invention.

[0030] Figure 2 is a top sectional view of a riser for a power transformer according to the present invention.

[0031] Figure 3 is a side sectional view of a riser for a power transformer according to the present invention.

[0032] Reference numerals list

[0033] 1. Raised seat

[0034] 1a. First longitudinal end wall

[0035] 1b Second longitudinal end wall

[0036] 1c first lateral side wall

[0037] 1d Second lateral side wall

[0038] 1e Top wall

[0039] 1f partition

[0040] 2. Opening

[0041] 2'. Opening

[0042] 3. Oil collecting pipe

[0043] 4. Open your mouth

[0044] 5. Bevel structure

[0045] 6. Second heat sink

[0046] 6' first heat sink DETAILED DESCRIPTION

[0047] Now, with reference to the accompanying drawings, specific embodiments of the present invention are described in detail. What is described here is only the preferred embodiment according to the present invention. Those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and the other ways also fall within the scope of the present invention. In the following specific description, directional terms, such as "left", "right", "up", "down", "inside", "outside", etc., are used with reference to the directions described in the accompanying drawings, where "first direction" and "longitudinal" refer to the length direction of the riser and the power transformer, "second direction" and "lateral" refer to the width direction of the riser and the power transformer, and "third direction" refers to the height direction of the riser. The components of the embodiments of the present invention can be placed in a variety of different directions, and the directional terms are used for illustrative purposes and are not restrictive.

[0048] Figure 1 A perspective view of a riser 1 for a power transformer according to the present invention is schematically shown.

[0049] The elevated seat 1 has a top wall 1e extending in a plane defined by a first direction (length direction) and a second direction (width direction), a first longitudinal end wall 1a extending in a plane defined by the second direction (width direction) and a third direction (height direction) perpendicular to the second direction, a second longitudinal end wall 1b extending parallel to the first longitudinal end wall 1a, a first lateral side wall 1c extending in a plane defined by the first direction (length direction) and a third direction (height direction) perpendicular to the first direction, and a second lateral side wall 1d parallel to the first lateral side wall 1c.

[0050] like Figure 2 As shown, the first lateral side wall 1c has a first main body portion and a first extension portion inclined relative to a plane defined by a first direction (length direction) and a third direction (height direction), and the second lateral side wall 1d has a second main body portion and a second extension portion inclined relative to a plane defined by the first direction and the third direction.

[0051] like Figure 2 As shown, the size of the main part of the first lateral side wall 1c is larger than the size of the main part of the second lateral side wall 1d, and the first extension part and the second extension part are inclined in the same direction relative to the plane defined by the first direction (length direction) and the third direction (height direction) and are respectively connected to the first longitudinal end wall 1a and the second longitudinal end wall 1b, thereby jointly defining the bottom opening of the elevated seat 1.

[0052] like Figure 1 As shown, the riser 1 has a partition 1f extending from the second lateral side wall 1d to the first lateral side wall 1c in parallel with the top wall 1e, and the partition 1f is at a distance of, for example, 230 mm (this distance is exemplary, and the distance can be any distance that does not hinder the operation) from the top wall 1e. The partition 1f ends at a distance of, for example, 60 mm (this distance is exemplary, and the distance can be any distance that does not hinder the operation) from the first lateral side wall 1c, thereby forming a space for oil to flow relative to the first lateral side wall 1c. The partition 1f is formed with an opening 2 (bushing oil hole) corresponding to the output end of the power transformer, and the opening 2 is formed in the partition 1f of the riser 1 in the first direction.

[0053] Figure 2 Three openings 2, 2' are shown, but the number of openings shown is exemplary and depends on the output of the power transformer. Figure 2As shown, the cross section of the middle opening 2' of the three openings 2, 2' is elliptical, and the cross sections of the other two openings 2 of the three openings 2, 2' are circular. The openings with different cross-sectional shapes are formed respectively so that the casing oil hole is in a three-phase asymmetric form, and the oil flow rate of the middle casing oil hole area is increased. In a preferred embodiment, in order to meet the purpose of increasing the oil flow rate of the middle casing oil hole area, the cross section of the middle opening 2' of the three openings 2, 2' can be designed into any shape other than an elliptical shape as required, and the cross sections of the other two openings 2 of the three openings 2, 2' can also be designed into any shape other than a circular shape as required.

[0054] Further Figure 1 As shown, the raised seat 1 has an oil collecting pipe 3 that penetrates the raised seat 1 in the first direction (length direction) at the intersection of the second transverse side wall 1d and the top wall 1f. The oil collecting pipe 3 opens at the first longitudinal end wall 1a and the second longitudinal end wall 1b, and the opening is closed by a flange (not shown). Figure 3 As shown, the cross section of the oil collecting pipe 3 is a hollow rectangular shape or other arbitrary shapes. The oil collecting pipe 3 is used to collect the oil in the inner space of the riser 1, so the hot oil can be efficiently introduced into the radiator through the oil collecting pipe 3.

[0055] Return to reference Figure 3 The oil collecting pipe 3 has a plurality of openings 4 (only one of the openings 4 is shown) communicating with the inner space of the raising seat 1 on the side facing the inner space of the raising seat 1. The openings 4 have lengths of, for example, 170 mm and 350 mm, respectively. These dimensions are exemplary, and the openings 4 can have lengths of any other dimensions. The plurality of openings 4 of the oil collecting pipe 3 can reasonably drain the hot oil from the key areas.

[0056] like Figure 3 As shown, the raised seat 1 has a chamfered structure 5 formed by a wall obliquely intersecting the top wall 1e and the first lateral side wall 1c at the intersection of the first lateral side wall 1c and the top wall 1e, thereby preventing dead oil areas from being generated at corners.

[0057] Further Figure 2 and Figure 3As shown, the side of the top wall 1e of the elevation seat 1 facing the internal space of the elevation seat 1 has a group of two first heat dissipating fins 6' extending toward the internal space of the elevation seat 1. According to a preferred embodiment, the number of the first fins 6' can be multiple groups of first fins each including two first heat dissipating fins 6', such as two groups, three groups, etc. The distance between the two first heat dissipating fins 6' on the top wall 1e of the elevation seat gradually decreases in the second direction (width direction) toward the second lateral side wall 1d, thereby forming a heat sink with an adjustable inclination angle, so that it is arranged into an oil guiding structure. In a preferred embodiment, the two fins 6' can be arranged asymmetrically as long as the flow of oil is reasonably guided. The two first heat dissipating fins 6' respectively have dimensions of 5x30x170 mm, which are exemplary dimensions, and the fins 6' can have dimensions of any other specifications. As Figure 2 and Figure 3 As shown, a side of the first lateral side wall 1 c of the riser 1 facing the inner space of the riser 1 and a side of the chamfered structure 5 facing the inner space of the riser 1 have a plurality of second heat dissipating fins 6 extending toward the inner space of the riser 1 .

[0058] In the present invention, the first heat sink fin 6' and the second heat sink fin 6 allow the oil to Figure 2 As shown by the arrows, the oil is guided through the periphery of the openings 2 , 2 ′ and enters the oil collecting pipe 3 through the opening 4 , thereby achieving the flow of oil in the riser 1 and reducing the overheating of the inner space of the riser 1 .

[0059] According to one aspect of the present invention, the present invention further provides a power transformer, which comprises a main body and a rising seat 1 defined according to the present invention.

[0060] The advantages of the present invention are:

[0061] 1. Ensure that the low-pressure pipe passes through the top, which makes cooperation with some customers easy.

[0062] 2. Since the three-phase heating is asymmetric, the three-phase asymmetric structure is more scientific;

[0063] 3. Use the built-in oil baffle structure to perform the oil guiding function.

[0064] The above description of various embodiments of the present invention is provided to one of ordinary skill in the relevant art for the purpose of description. It is not intended that the present invention be exclusive or limited to a single disclosed embodiment. As mentioned above, a person of ordinary skill in the field of the above teachings will understand the various substitutions and variations of the present invention. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all substitutions, modifications and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. A raised stand (1) for a power transformer, characterized in that: The raised seat (1) comprises an internal space, a top wall (1e) extending in a plane defined by a first direction and a second direction, a first longitudinal end wall (1a) extending in a plane defined by the second direction and a third direction perpendicular to the second direction, a second longitudinal end wall (1b) extending parallel to the first longitudinal end wall (1a), a first transverse side wall (1c) extending in a plane defined by the first direction and a third direction perpendicular to the first direction, and a second transverse side wall (1d) parallel to the first transverse side wall (1c), wherein the first transverse side wall (1c) comprises a first main body portion and a second longitudinal end wall (1a) extending parallel to the first longitudinal end wall (1a). and a first extension portion inclined relative to the plane defined by the third direction, the second transverse side wall (1d) having a second main body portion and a second extension portion inclined relative to the plane defined by the first direction and the third direction, the main body portion of the first transverse side wall (1c) being larger than the main body portion of the second transverse side wall (1d), and the first extension portion and the second extension portion being inclined in the same direction relative to the plane defined by the first direction and the third direction so as to be connected together with the first longitudinal end wall (1a) and the second longitudinal end wall (1b) to jointly define a bottom opening of the raised seat (1); The raised seat (1) has an oil collecting pipe (3) located at the intersection of the second transverse side wall (1d) and the top wall (1e), extending in the first direction and penetrating the raised seat (1). Furthermore, the raised seat (1) has a partition (1f) extending from the second lateral side wall (1d) toward the first lateral side wall (1c) in parallel with the top wall (1e), the partition (1f) is formed with openings (2, 2') corresponding to the output end of the power transformer and penetrating the partition (1f), the openings (2, 2') are arranged along the first direction, the cross-section of one of the openings (2, 2') is elliptical, and the cross-section of the other openings (2) of the openings (2, 2') is circular. Furthermore, a top wall (1e) of the elevation seat (1) has two first heat dissipation fins (6') extending toward the internal space of the elevation seat on one side facing the internal space of the elevation seat (1), and a first lateral side wall (1c) of the elevation seat (1) has a plurality of second heat dissipation fins (6) extending toward the internal space of the elevation seat on one side facing the internal space of the elevation seat (1), and the first heat dissipation fins (6') and the second heat dissipation fins (6) are constructed to guide oil so that the oil flows around the opening (2') having an elliptical cross-section and finally flows into the oil collecting pipe (3).

2. The elevated seat (1) according to claim 1, characterized in that: The cross section of the oil collecting pipe (3) is in the shape of a hollow rectangle.

3. The elevated seat (1) according to claim 1, characterized in that: The oil collecting pipe (3) has a plurality of openings (4) communicating with the internal space of the raising seat (1) on a side facing the internal space of the raising seat (1).

4. The raised seat (1) according to claim 1, characterized in that: The raised seat (1) has a chamfered structure (5) at the intersection of the first transverse side wall (1c) and the top wall (1e), which is formed by a wall obliquely intersecting the top wall (1e) and the first transverse side wall (1c).

5. The raised seat (1) according to claim 1, characterized in that: The distance between the two first heat dissipation fins (6') on the top wall (1e) of the elevated seat (1) gradually decreases in the second direction toward the second transverse side wall (1d).

6. A power transformer, characterized in that: The power transformer comprises a main body and a riser (1) according to any one of claims 1-5.

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