An oil-immersed transformer

Abstract

The application discloses an oil-immersed transformer and relates to the technical field of transformer substations. The transformer comprises a core, a box, a low-voltage bushing and a high-voltage bushing. The box is hexagonal in shape and comprises staggered long side walls and short side walls. The top end of one long side wall is provided with a first mounting seat, the bottom end of one short side wall is provided with a second mounting seat, and the long side wall provided with the first mounting seat and the short side wall provided with the second mounting seat are oppositely arranged. The core is mounted in the interior of the box. The low-voltage bushing is mounted on the second mounting seat and electrically connected with the core. The high-voltage bushing is mounted on the first mounting seat and electrically connected with the core. The transformer can reduce the size of the overall structure while maintaining the performance such as the loss and the temperature rise, thereby facilitating the installation and use of the user.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer substations, and in particular to an oil-immersed transformer. BACKGROUND

[0002] With the development of the new energy industry, the demand for various devices supporting new energy vehicles, especially transformer substations, is increasing. A transformer substation mainly includes a high-voltage cabinet, a transformer, a low-voltage cabinet, and a charging stack connected in sequence, thereby converting external high-voltage power into low-voltage power for powering electric vehicles. In the face of complex installation conditions in different use environments, a double-layer transformer substation has appeared on the market, which designs the transformer and the low-voltage cabinet as a double-layer structure, thereby realizing the miniaturization of the transformer substation and facilitating the installation and use of the transformer substation. As the main component of the transformer substation, the transformer needs to be further designed and innovated to meet the use of small-sized double-layer transformer substations. Under this premise, how to design a transformer that does not change the performance of loss, temperature rise, etc. while reducing the size has become a problem to be solved. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an oil-immersed transformer, which can reduce the size of the transformer without changing the performance of loss, temperature rise, etc. of the transformer.

[0004] According to an oil-immersed transformer according to an embodiment of the present application, the transformer includes a core, a box, a low-voltage bushing, and a high-voltage bushing. The box has a hexagonal shape and includes long side walls and short side walls arranged alternately. The upper part of one of the long side walls is provided with a first mounting seat, and the bottom end of one of the short side walls is provided with a second mounting seat. The long side wall provided with the first mounting seat and the short side wall provided with the second mounting seat are arranged opposite to each other. The core is installed inside the box. The low-voltage bushing is installed on the second mounting seat and electrically connected to the core. The high-voltage bushing is installed on the first mounting seat and electrically connected to the core.

[0005] According to the oil-immersed transformer of the embodiment of the present application, at least the following beneficial effects are achieved: when assembling a transformer substation, a user installs the transformer into a transformer chamber on the upper layer of the transformer substation, then connects a high-voltage cabinet and a high-voltage bushing of the transformer substation, and connects a low-voltage cabinet and a low-voltage bushing, so that the installation of the oil-immersed transformer in the double-layer transformer substation is completed. Since the current transformer basically adopts a closed triangular core with simple process and good energy-saving effect, the core of the transformer is mainly composed of an iron core and a coil, and the high-voltage outgoing line and the low-voltage outgoing line of the core are oppositely arranged, therefore, the cross section of the core of the transformer is approximately hexagonal, the box body of the transformer is arranged as a hexagon matching the outer shape of the core, the high-voltage bushing and the low-voltage bushing are arranged on the opposite long side wall and short side wall respectively, which conforms to the structural characteristics of the core, fully utilizes the installation space inside the box body, reduces the material cost of transformer oil and the like, and effectively improves the structural rationality of the transformer. In addition, the high-voltage bushing and the low-voltage bushing are arranged on the side wall of the box body, which can effectively reduce the height of the box body, and since the transformer is installed above the low-voltage cabinet, the low-voltage bushing is arranged at the bottom end of the short side wall, which can reduce the distance between the low-voltage bushing and the low-voltage cabinet, thereby saving the connection copper bar material of the transformer substation and reducing the installation cost of the transformer substation. The high-voltage bushing is arranged at the upper part of the long side wall, which can ensure the insulation distance between the high-voltage bushing and the bottom surface of the transformer chamber, and also facilitates the wiring between the high-voltage bushing and the high-voltage cabinet with high height. Since the present application mainly improves the box body structure outside the transformer and retains the main push structure of the core for transformer operation inside, the overall structure of the transformer can be reduced in size while the performance such as loss and temperature rise is not changed, which is convenient for users to install and use.

[0006] According to some embodiments of the present application, the box body is provided with an air layer above the core.

[0007] According to some embodiments of the present application, the first mounting seat is provided with a mounting inclined surface, an end of the mounting inclined surface away from the box body is inclined downward, and the high-voltage bushing is mounted on the mounting inclined surface.

[0008] According to some embodiments of the present application, the box body is connected with a first heat dissipation member and two second heat dissipation members, the first heat dissipation member is located below the first mounting seat, the two second heat dissipation members are symmetrically arranged between the first heat dissipation member and the second mounting seat, and the first heat dissipation member, the two second heat dissipation members and the second mounting seat are arranged at intervals along the circumference of the box body.

[0009] According to some embodiments of the present application, the second heat dissipation member includes a plurality of first corrugated sheets and a connecting plate, the plurality of first corrugated sheets are connected with the connecting plate, the connecting plate is provided with a bending portion, the bending portion divides the connecting plate into a long edge segment and a short edge segment, the long edge segment is connected with the long side wall, and the short edge segment is connected with the short side wall.

[0010] According to some embodiments of the present application, the first heat dissipation member comprises a plurality of second corrugated sheets, the plurality of second corrugated sheets are arranged in a horizontal direction, and in a vertical direction, the height of the second corrugated sheets is lower than the height of the first corrugated sheets.

[0011] According to some embodiments of the present application, the box is provided with an oil level gauge, the oil level gauge is located above the second heat dissipation member and on one side of the first mounting seat.

[0012] According to some embodiments of the present application, the second mounting seat is provided with a hand hole, the hand hole is located above the low-voltage bushing and is arranged in an inclined manner, and the end of the hand hole away from the box is inclined downward.

[0013] According to some embodiments of the present application, the second mounting seat is connected with a cover plate, and the cover plate is used to close the hand hole.

[0014] According to some embodiments of the present application, the box is provided with a tapping switch electrically connected with the core, the tapping switch and the second mounting seat are located on the same short side wall, and the tapping switch is located above the second mounting seat.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0017] Figure 1 is a structural schematic diagram of an oil-immersed transformer according to an embodiment of the present application;

[0018] Figure 2 is a front view of an oil-immersed transformer according to an embodiment of the present application;

[0019] Figure 3 is a side view of an oil-immersed transformer according to an embodiment of the present application;

[0020] Figure 4 is a structural schematic diagram of a second heat dissipation member according to an embodiment of the present application.

[0021] Reference signs: box 100; hand hole 101; long side wall 110; short side wall 120; tap switch 121; first mounting seat 130; mounting slope 131; second mounting seat 140; air layer 150; oil level gauge 160; cover plate 170; base 180; box cover 190; low-voltage bushing 200; high-voltage bushing 300; first heat sink 400; second corrugated sheet 410; second heat sink 500; liquid storage cavity 501; first corrugated sheet 510; connecting plate 520; bending part 521; long edge segment 522; short edge segment 523. DETAILED DESCRIPTION

[0022] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only, and are not to be understood as limiting the present application.

[0023] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0025] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0026] Reference Figure 1The oil-immersed transformer according to one embodiment of the present application comprises a core (not shown in the figure), a box 100, a low-voltage bushing 200 and a high-voltage bushing 300. The core is mainly composed of a triangular closed core and a coil arranged around the core. The core has the advantages of simple process and energy-saving effect. The box 100 has a hexagonal shape matching the shape of the core. The hexagonal box 100 comprises three long side walls 110 and three short side walls 120. The long side walls 110 and the short side walls 120 are arranged alternately and surround a containing cavity (not shown in the figure). The box 100 further comprises a base 180 and a cover 190. The base 180 and the cover 190 are respectively arranged on two sides of the containing cavity to close the containing cavity. The core is installed in the containing cavity of the box 100. The core is immersed in transformer oil in the containing cavity. The top end of one long side wall 110 is provided with a first mounting seat 130. The high-voltage outgoing line of the core is led out of the first mounting seat 130. The bottom end of one short side wall 120 is provided with a second mounting seat 140. The low-voltage outgoing line of the core is led out of the second mounting seat 140. The long side wall 110 provided with the first mounting seat 130 and the short side wall 120 provided with the second mounting seat 140 are arranged oppositely. The low-voltage bushing 200 is installed in the second mounting seat 140 and connected with the high-voltage outgoing line of the core. The high-voltage bushing 300 is installed in the first mounting seat 130 and connected with the low-voltage outgoing line of the core.

[0027] It can be understood that when the transformer is assembled into the transformer chamber on the upper layer of the transformer substation, the high-voltage cabinet and the high-voltage bushing 300 of the transformer substation are connected, and the low-voltage cabinet and the low-voltage bushing 200 are connected, so that the installation of the oil-immersed transformer in the double-layer transformer substation is completed. Since the current transformer basically adopts a closed triangular core with simple process and good energy-saving effect, the core of the transformer is mainly composed of an iron core and a coil, and the high-voltage outgoing line and the low-voltage outgoing line of the core are arranged opposite to each other, therefore, the cross section of the core of the transformer is approximately hexagonal, the box body 100 of the transformer is set to a hexagon matching the shape of the core, the high-voltage bushing 300 and the low-voltage bushing 200 are arranged on the opposite long side wall 110 and short side wall 120 respectively, which conforms to the structural characteristics of the core, fully utilizes the installation space inside the box body 100, reduces the material cost of transformer oil and the like, and effectively improves the structural rationality of the transformer. In addition, by arranging the high-voltage bushing 300 and the low-voltage bushing 200 on the side wall of the box body 100, the structure of arranging the high-voltage bushing 300 and the low-voltage bushing 200 on the top of the oil tank is cancelled, which can effectively reduce the height of the box body 100. Since the volume size of the high-voltage bushing 300 installed in the same transformer is usually larger than that of the low-voltage bushing 200, the high-voltage bushing 300 needs to be installed on the long side wall 110 with a larger installation space in the transformer, and the low-voltage bushing 200 needs to be installed on the short side wall 120 with a smaller installation space in the transformer. In addition, since the transformer is installed above the low-voltage cabinet, the low-voltage bushing 200 is arranged at the bottom end of the short side wall 120, which can reduce the distance between the low-voltage bushing 200 and the low-voltage cabinet, thereby saving the connection copper bar material of the transformer substation and reducing the installation cost of the transformer substation. The high-voltage bushing 300 is arranged at the upper part of the long side wall 110, which can ensure the insulation distance between the high-voltage bushing 300 and the bottom surface of the transformer chamber, and also facilitates the wiring between the high-voltage bushing 300 and the high-voltage cabinet with high height. Since the application mainly improves the structure of the box body 100 outside the transformer, the main structure of the core inside the transformer for voltage transformation is retained, therefore, the overall structure size of the transformer can be reduced while slightly affecting the loss, temperature rise and the like under the premise of not changing the performance such as loss and temperature rise, or meeting the national standard, which is convenient for users to install and use.

[0028] Further, the box 100 is provided with a tapping switch 121 electrically connected with the core, the tapping switch 121 and the second mounting seat 140 are located on the same short side wall 120, and the tapping switch 121 is located above the second mounting seat 140. The tapping switch 121 changes the turns ratio of the high-voltage winding and the low-voltage winding of the transformer by connecting with different transformer winding taps, thereby adjusting the output voltage of the transformer. After the transformer is installed, the side where the second mounting seat 140 is located is usually taken as the front side, that is, the second mounting seat 140 is arranged on the front side of the double-layer transformer substation. By arranging the tapping switch 121 and the second mounting seat 140 on the same short side wall 120, the installation space above the second mounting seat 140 is fully utilized, the user can directly use the tapping switch 121, and the output voltage of the transformer can be quickly adjusted. In this way, the rationality of the structure of the transformer is further improved, and the user experience is improved.

[0029] With reference to Figure 1 and Figure 2 It can be understood that the box 100 is provided with an air layer 150, the air layer 150 is part of the accommodating cavity in the box 100, and the air layer 150 is located above the core. Specifically, when the core is installed in the accommodating cavity and immersed in the transformer oil, there is a cavity between the oil level of the transformer oil and the top surface of the accommodating cavity, and the cavity is the air layer 150. By arranging the air layer 150, the oil-immersed transformer can cope with the volume change of the transformer oil during the working process without the need for an oil storage tank. In addition, the oil-immersed transformer does not need to be provided with a traditional tubular oil level gauge 160 to detect the oil level. The oil-immersed transformer can work normally without the need for an oil storage tank, thereby further reducing the height of the transformer and reducing the volume of the transformer.

[0030] Further, the box 100 is provided with an oil level gauge 160. The oil level gauge 160 is a pointer type oil level gauge 160 that detects the oil level height through a floating ball. The oil level gauge 160 is located above the second heat sink 500 and on one side of the first mounting seat 130, that is, the oil level gauge 160 is mounted on the short side wall 120 adjacent to the long side wall 110 where the first mounting seat 130 is arranged. While the tubular oil level gauge 160 arranged at the top of the transformer is cancelled, in order not to affect the overall height of the transformer and detect the oil level height, it is necessary to arrange an oil level gauge 160 on the side wall of the transformer again. The oil level gauge 160 is a pointer type oil level gauge 160 with a floating ball (not shown in the figure). The floating ball can move synchronously with the rise and fall of the transformer oil level surface, thereby detecting the oil level height of the transformer oil. The oil level gauge 160 is arranged above the second heat sink 500 and on one side of the first mounting seat 130. When the transformer is installed on the upper layer of the double-layer transformer substation, the oil level gauge 160 and the user are approximately parallel, which is convenient for the user to observe the oil level and further improves the user experience. It should be noted that the transformer chamber of the double-layer transformer substation where the transformer is installed is usually designed with double doors in front and back. Therefore, although the oil level gauge 160 is located on one side of the first mounting seat 130, that is, the oil level gauge 160 is arranged on the back side of the transformer, the user can also open the back door of the transformer chamber to observe the oil level gauge 160.

[0031] Referring to Figure 1 and Figure 3 It can be understood that the first mounting seat 130 is provided with a mounting slope 131. The end of the mounting slope 131 away from the box 100 is inclined downward. The high-voltage bushing 300 is mounted on the mounting slope 131. Since the high-voltage bushing 300 itself is relatively long, when the high-voltage bushing 300 is installed on the upper part of the long side wall 110 of the box 100, the high-voltage bushing 300 is vertically arranged, which also slightly increases the height of the transformer. The high-voltage bushing 300 is horizontally arranged, which increases the width of the transformer. By arranging the mounting slope 131, the high-voltage bushing 300 is inclinedly mounted on the first mounting seat 130. While ensuring the qualified insulation distance between the high-voltage bushing 300 and the bottom surface of the transformer chamber, the influence of the high-voltage bushing 300 on the width and height of the transformer is reduced, which further improves the structural rationality of the transformer. At the same time, the inclined mounting slope 131 of the mounting seat can also buffer and adjust the change of the oil level in the oil tank, thereby improving the operation stability of the transformer.

[0032] Further, the second mounting seat 140 is provided with a hand hole 101, the hand hole 101 is located above the low-voltage bushing 200 and is inclinedly arranged, and an end of the hand hole 101 away from the box body 100 is inclined downward. The hand hole 101 is a hollow structure for professional electricians to view, operate or maintain the core low-voltage outgoing line, and when the hand hole 101 is arranged on the second mounting seat 140, if the hand hole 101 is horizontally arranged, the intersection of the hand hole 101 and the user's visual field area is small, and it is inconvenient for the user to observe the outgoing line structure inside the second mounting seat 140 through the hand hole 101, and if the hand hole 101 is vertically arranged, there is a large angle between the hand hole 101 and the outgoing line structure inside the second mounting seat 140, and workers need to bend their elbows to pass through the hand hole 101 to operate or maintain the outgoing line structure, thereby increasing the debugging difficulty of the transformer, and the hand hole 101 is inclinedly arranged, so that the user can conveniently view the outgoing line structure inside the second mounting seat 100, and workers can conveniently pass their hands through the hand hole 101 to operate or maintain the outgoing line structure, thereby reducing the debugging difficulty of the transformer, reducing the maintenance cost of the transformer in the later period, and further improving the user experience.

[0033] Still further, the second mounting seat 140 is connected with a cover plate 170, and the cover plate 170 is used to close the hand hole 101. The cover plate 170 and the second mounting seat 140 are bolted through the flange structure of the outer edge of the cover plate 170, the hand hole 101 on the second mounting seat 140 is closed by arranging the cover plate 170, non-professionals are prevented from contacting the electrical elements in the hand hole 101, and at the same time, foreign sand, impurities, flying insects and ants are prevented from entering the hand hole 101, thereby further improving the safety of the transformer in use, prolonging the service life of the second mounting seat 140, and improving the user experience.

[0034] Reference Figures 1 to 3It can be understood that the box 100 is connected with the first heat dissipation member 400 and the two second heat dissipation members 500, the first heat dissipation member 400 is located below the first mounting seat 130, and the two second heat dissipation members 500 are symmetrically arranged between the first heat dissipation member 400 and the second mounting seat 140. Specifically, since the first heat dissipation member 400 and the second mounting seat 140 are respectively mounted on the opposite long side walls 110 and short side walls 120, the first heat dissipation member 400 and the second mounting seat 140 are symmetrically arranged between the other two long side walls 110 and the other two short side walls 120. The long side wall 110 and the short side wall 120 located on the same side of the first heat dissipation member 400 and the second mounting seat 140 are fixedly connected and connected with one of the second heat dissipation members 500. The first heat dissipation member 400, the two second heat dissipation members 500 and the second mounting seat 140 are arranged along the circumference of the box 100. Since the short side wall 120 on the front side of the transformer has arranged the tap switch 121 and the second mounting seat 140 up and down, and the installation area provided by the short side wall 120 itself is small, therefore, the short side wall 120 on the front side of the transformer usually does not install other components, and the other three long side walls 110 and two short side walls 120 around the transformer can provide a large amount of installation space (the long side wall 110 provided with the first mounting seat 130, since the first mounting seat 130 is arranged on the upper part, and the installation area provided by the long side wall 110 itself is large, therefore, a large installation area is reserved below the first mounting seat 130), by arranging the first heat dissipation member 400 and the second heat dissipation member 500, the first heat dissipation member 400, the two second heat dissipation members 500 and the second mounting seat 140 are arranged along the circumference of the box 100. The installation space around the transformer is fully utilized, the heat dissipation efficiency of the transformer is greatly improved, and the service life of the transformer is prolonged.

[0035] With reference to Figure 4It can be understood that the second heat dissipation member 500 includes a plurality of first corrugated sheets 510 and a connecting plate 520, the plurality of first corrugated sheets 510 are connected with the connecting plate 520, the first corrugated sheet 510 is internally provided with a liquid storage cavity 501, the liquid storage cavity 501 penetrates the connecting plate 520 and is in communication with the accommodating cavity of the box body 100, thereby storing the transformer oil in part of the accommodating cavity, the connecting plate 520 is provided with a bending portion 521, the bending portion 521 divides the connecting plate 520 into a long edge segment 522 and a short edge segment 523, the long edge segment 522 is connected with the long side wall 110, and the short edge segment 523 is connected with the short side wall 120. By arranging the first corrugated sheet 510, the high-temperature transformer oil in the accommodating cavity enters the liquid storage cavity 501 from above the liquid storage cavity 501, the first corrugated sheet 510 conducts heat to the air by heat exchange, so that the temperature of the oil is reduced, the transformer oil after being cooled returns to the accommodating cavity from below the liquid storage cavity 501, the liquid storage cavity 501 replenishes new high-temperature transformer oil, the circulation convection of the transformer oil is realized, the operation temperature of the transformer is reduced, and since the second heat dissipation member 500 is simultaneously installed on the adjacent short side wall 120 and long side wall 110 between the second mounting seat 140 and the first heat dissipation member 400, by arranging a plurality of first corrugated sheets 510 respectively installed on the long side wall 110 and the short side wall 120, the heat dissipation area of the first corrugated sheet 510 can be greatly increased, the heat dissipation efficiency of the second heat dissipation member 500 is further improved, the connecting plate 520 is connected with the box body 100, specifically, the connecting plate 520 is sealingly connected with the box body 100 by welding or the like and becomes part of the side wall of the box body 100, so as to ensure the sealing property of the box body 100, by arranging the bending portion 521, the connecting plate 520 is bent and divided into the long edge segment 522 and the short edge segment 523, the shape of the second heat dissipation member 500 matches the shape of the hexagonal box body 100, the second heat dissipation member 500 can be conveniently installed by a user, and the production cost of the transformer is reduced.

[0036] It should be noted that since the first corrugated sheet 510 is arranged on the connecting plate 520 first and then connected with the box body 100, before the second heat dissipation member 500 is installed, the manufacturer can increase the number of the first corrugated sheet 510, thereby reducing the width of the first corrugated sheet 510, reducing the overall length and / or width of the transformer, and further reducing the volume of the transformer.

[0037] Further, the first heat dissipation member 400 is also provided with a similar structure as the second heat dissipation member 500, thereby improving the consistency of the overall structure of the transformer. The first heat dissipation member 400 includes a plurality of second corrugated sheets 410 arranged in a horizontal direction at intervals. The connecting plate of the second corrugated sheet 410 does not need to be bent, but can be directly welded with the long side wall 110 provided with the first mounting seat 130. The specific structure and effects of the second corrugated sheet 410 can refer to the description of the first corrugated sheet 510 above, and will not be described here. In the vertical direction, the height of the second corrugated sheet 410 is lower than the height of the first corrugated sheet 510. By setting the height of the second corrugated sheet 410 to be lower than the height of the first corrugated sheet 510, the reduced part of the second corrugated sheet 410 relative to the first corrugated sheet 510 can avoid the first heat dissipation member 400, thereby avoiding interference between the first heat dissipation member 400 and the first mounting seat 130 during installation and use of the transformer, affecting the normal use of the transformer or affecting the installation stability of the first heat dissipation member 400 and the first mounting seat 130, further improving the structural rationality of the transformer. At the same time, since the first corrugated sheet 510 does not need to avoid large-sized components such as the first mounting seat 130, the height of the first corrugated sheet 510 can be set to be higher than that of the second corrugated sheet 410, further expanding the heat dissipation area of the first corrugated sheet 510, fully utilizing the installation area of the long side wall 110 and the short side wall 120, and further improving the heat dissipation efficiency of the transformer.

[0038] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-described embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. A double-layer oil-immersed transformer for a substation, the oil-immersed transformer being installed in a transformer room on an upper layer of a substation, and a low-voltage cabinet being installed below the oil-immersed transformer, characterized in that, The utility model relates to a transformer box, which comprises a hexagonal box body, a core, a low-voltage bushing, a high-voltage bushing, an air layer, a first heat sink, two second heat sinks, a liquid storage cavity, an installation slope, a hand hole, a cover plate, and an oil level gauge. The hexagonal box body comprises staggered long side walls and short side walls, one of the long side walls is provided with a first mounting seat at the upper part, one of the short side walls is provided with a second mounting seat at the bottom end, and the long side wall provided with the first mounting seat and the short side wall provided with the second mounting seat are oppositely arranged. The core is installed in the interior of the box body. The low-voltage bushing is installed in the second mounting seat and electrically connected with the core. The high-voltage bushing is installed in the first mounting seat and electrically connected with the core. The air layer is located above the core, the box body is connected with the first heat sink and the two second heat sinks, the first heat sink is located below the first mounting seat, the two second heat sinks are symmetrically arranged between the first heat sink and the second mounting seat, the first heat sink, the two second heat sinks, and the second mounting seat are spaced along the circumference of the box body, the second heat sink comprises a plurality of first corrugated sheets and a connecting plate, the plurality of first corrugated sheets are connected with the connecting plate, the connecting plate is provided with a bending part, the bending part divides the connecting plate into a long edge segment and a short edge segment, the long edge segment is connected with the long side wall, and the short edge segment is connected with the short side wall. The first corrugated sheet is internally provided with a liquid storage cavity, the liquid storage cavity penetrates through the connecting plate and is in communication with a containing cavity of the box body, thereby storing part of transformer oil in the containing cavity, the transformer oil in the containing cavity enters the liquid storage cavity from above the liquid storage cavity, the first corrugated sheet conducts heat exchange to transfer the oil temperature to the air, thereby achieving cooling, the cooled transformer oil returns to the containing cavity from below the liquid storage cavity, the first mounting seat is provided with an installation slope, one end of the installation slope away from the box body is inclined downward, the high-voltage bushing is installed on the installation slope, the second mounting seat is provided with a hand hole, the hand hole is located above the low-voltage bushing and is inclined, and one end of the hand hole away from the box body is inclined downward.

2. A double-winding transformer for a substation according to claim 1, characterized in that, The first heat sink comprises a plurality of second corrugated sheets, the plurality of second corrugated sheets are spaced in the horizontal direction, and in the vertical direction, the height of the second corrugated sheet is lower than the height of the first corrugated sheet.

3. A double -deck oil immersed transformer for a substation as claimed in claim 1, wherein, The box body is provided with an oil level gauge, the oil level gauge is located above the second heat sink and on one side of the first mounting seat.

4. A double -deck oil immersed transformer for a substation as claimed in claim 1, wherein, The second mounting seat is connected with a cover plate, and the cover plate is used for closing the hand hole.

5. A double -deck oil immersed transformer for a substation as claimed in claim 1, wherein, The box body is provided with a tap switch electrically connected with the core, the tap switch and the second mounting seat are located on the same short side wall, and the tap switch is located above the second mounting seat.

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