Oil-immersed transformer

Abstract

The utility model discloses an oil-immersed transformer which comprises a transformer core, a box body and a box cover, the box body is provided with a mounting cavity with an opening in the top end, the transformer core is contained in the mounting cavity, and the mounting cavity is filled with transformer oil; the box cover is connected with the box body; an air layer is formed between the transformer oil and the box cover; wherein a partition plate assembly is arranged in the mounting cavity, a breathing chamber is defined between the partition plate assembly and the inner wall of the box body, the partition plate assembly is provided with a breathing channel, and the breathing chamber is communicated with the air layer through the breathing channel. By arranging the breathing chamber, even if the volumes of the mounting cavities in the transformer are different, air layers with the same height and lower height can be arranged, so that the transformers with different volumes can be applied to parts such as pressing bushings and tap switches with the same specification, and the management cost of the transformer is reduced; and meanwhile, the high-voltage bushing, the tap switch and other components do not need to be customized and heightened, so that the safety of the transformer in the transportation process is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field, in particular to an oil immersed transformer. BACKGROUND

[0002] The existing air layer oil immersed transformer usually needs to set up air layer to adapt to the volume change of transformer oil under different temperatures, but the air layer height in the transformer of different capacity is not the same, which easily leads to the following problems:

[0003] 1. The inconsistent height of air layer makes high voltage sleeve and tap switch and other components need to be customized, and the increase of transformer component specifications leads to the increase of management cost;

[0004] 2. When the air layer height is high, the mechanical strength of the high voltage sleeve and tap switch after being increased may be insufficient, and there is a safety hazard in the transportation process;

[0005] 3. The high air layer height leads to the high height of the transformer, which is not suitable for this type of transformer in some height limited occasions. UTILITY MODEL CONTENT

[0006] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides an oil immersed transformer, which controls the air layer height by setting a breathing chamber, unifies the specifications of high voltage sleeve and tap switch and other components, reduces the management cost, ensures the mechanical strength, and reduces the height size of the transformer, facilitating the application of the transformer in low space.

[0007] According to the oil immersed transformer provided by the utility model, the breathing chamber is formed between the air layer and the breathing passage, and the breathing chamber is communicated with the air layer through the breathing passage, so that the air layer height can be controlled, the specifications of high voltage sleeve and tap switch and other components are unified, the management cost is reduced, the mechanical strength is ensured, and the height size of the transformer is reduced.

[0008] According to some embodiments of the utility model, the breathing chamber is provided with a plurality of breathing passages, and the outer side of the box body is provided with a plurality of heat dissipation pieces, the breathing chambers and the heat dissipation pieces are staggered along the circumference of the box body.

[0009] According to some embodiments of the utility model, the box shape is hexagon, the box of hexagon includes bottom plate and six first side plate, the bottom plate and six the first side plate between surrounding formation installation cavity, the baffle assembly includes second side plate and top plate, the breathing passage sets up in the top plate, the second side plate is located one side of the device core, along vertical direction, two ends of the second side plate are connected with the bottom plate and the top plate respectively, the second side plate, the bottom plate, the top plate and at least one the first side plate form the breathing chamber.

[0010] According to some embodiments of the utility model, the second side plate, the top plate and the first side plate are welded and fixed.

[0011] According to some embodiments of the utility model, the breathing passage includes breathing pipe, the breathing pipe is set up and protrudes from the surface of the top plate along the vertical direction upwards.

[0012] According to some embodiments of the utility model, the breathing passage further includes anti-oil device, the anti-oil device is installed on the breathing pipe, and the anti-oil device is used to limit the flow of transformer oil to the breathing chamber.

[0013] According to some embodiments of the utility model, the breathing pipe is provided with a plurality of anti-oil devices and breathing pipes.

[0014] The oil-immersed transformer of the utility model has at least the following beneficial effects: when the temperature around the transformer rises, the volume of the transformer oil increases and presses the air layer, the pressed air can enter the breathing chamber through the breathing passage; when the temperature around the transformer drops, the volume of the transformer oil decreases, and the air in the breathing chamber returns to the air layer above the transformer oil through the breathing passage. By setting the breathing chamber, the breathing chamber is communicated with the air layer through the breathing passage, the overall volume of the air layer can be indirectly increased, even if the installation cavity volume inside the transformer is different, the air layer with the same height and the height of the bottom can be set, so that the transformers with different volumes can apply the same specification of pressure sleeve pipe and tapping switch components, and the traditional oil pillow, breather and other components are omitted, the management cost of the transformer is effectively reduced; at the same time, the high-pressure sleeve pipe and the tapping switch component do not need to be customized to be higher, the mechanical strength of such components is guaranteed, and the safety of the transformer in the transportation process is improved. In addition, the air layer can reduce the original air layer height in the box, thereby reducing the overall height of the transformer, so that the transformer can be applied to low space.

[0015] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model makes further illustration below combining with the drawings and examples, among them,

[0017] Figure 1 It is the front view of oil-immersed transformer of an embodiment of the utility model,

[0018] Figure 2 It is the plan view of oil-immersed transformer of an embodiment of the utility model,

[0019] Figure 3 It is the perspective view of box of an embodiment of the utility model.

[0020] Reference signs: box 100, installation cavity 110, bottom plate 120, first side plate 130, short side plate 131, long side plate 132, radiator 140, box cover 200, air layer 210, baffle assembly 300, breathing chamber 310, breathing channel 320, breathing pipe 321, second side plate 330, top plate 340. DETAILED DESCRIPTION

[0021] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0022] In the description of the utility model, it is understood that the orientation description, such as up, down, front, back, left, right, etc. The orientation or positional relationship shown in the drawing is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0023] In the description of the utility model, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. It is understood that the number is not included, and the above, below, etc. It is understood that the number is included. If the first and the second are described, they are only used to distinguish the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0024] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. Should be understood broadly, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0025] Reference Figure 1 andFigure 2 As shown in the utility model, the oil-immersed transformer comprises a core, a box body 100 and a box cover 200. The core is usually shaped as a three-dimensional triangle. The box body 100 is shaped as a hexagon corresponding to the core. The hexagonal box body 100 comprises a bottom plate 120 and six first side plates 130. An installation cavity 110 with an open top is formed between the bottom plate 120 and the six first side plates 130. The box cover 200 is sealingly connected to the box body 100 to close the opening of the installation cavity 110. The box cover 200 is provided with a plurality of connecting members such as high and low voltage bushings electrically connected to the core. The box body 100 is provided with fin-shaped radiators 140 at intervals around the periphery. The box cover 200 is provided with high voltage bushings and tap changers.

[0026] Referring to Figure 3 As shown in the utility model, the core is accommodated in the installation cavity 110, and the installation cavity 110 is filled with transformer oil for immersing the core. An air layer 210 is formed between the liquid surface of the transformer oil and the box cover 200. The installation cavity 110 is provided with a baffle assembly 300. The baffle assembly 300 comprises a second side plate 330 and a top plate 340. In the vertical direction, the height of the second side plate 330 is higher than the height of the transformer oil. The second side plate 330 and the top plate 340 are both flat plate members and are perpendicular to each other. The second side plate 330 is located on one side of the core. In the vertical direction, the two ends of the second side plate 330 are connected to the bottom plate 120 and the top plate 340, respectively. The second side plate 330, the bottom plate 120, the top plate 340 and at least one first side plate 130 form a breathing chamber 310.

[0027] Specifically, under the premise of reserving sufficient installation space for the core, the two sides of the second side plate 330 can be connected to two adjacent first side plates 130, respectively. At this time, the cross section of the breathing chamber 310 is triangular. The two sides of the second side plate 330 can also be connected to two spaced first side plates 130, respectively. The second side plate 330, the bottom plate 120, the top plate 340 and the two first side plates 130 form the breathing chamber 310. At this time, the cross section of the breathing chamber 310 is quadrangular. The two sides of the second side plate 330 can also be bent or welded with ear plates to fill the gap between the second side plate 330 and the first side plate 130. At this time, the second side plate 330, the bottom plate 120, the top plate 340 and one first side plate 130 can form the breathing chamber 310. The shape of the breathing chamber is related to the shape of the second side plate 330, which is not limited here.

[0028] By arranging the second side plate 330 and the top plate 340, the second side plate 330 and the top plate 340 are simple in structure and convenient to design, which can effectively simplify the structure of the baffle assembly 300 and facilitate the processing and forming of the breathing chamber 310.

[0029] Referring to Figure 3As shown, it can be understood that the baffle assembly 300 is provided with a breathing passage 320 located above the transformer oil, wherein the breathing passage 320 comprises a breathing pipe 321, the breathing passage 320 is arranged on the top plate 340, the breathing pipe 321 is arranged in a vertical direction and protrudes from the surface of the top plate 340, and the breathing chamber 310 is in communication with the air layer 210 through the breathing passage 320.

[0030] Since the top plate 340 is higher than the liquid level of the transformer oil, the height difference between the transformer oil and the breathing passage 320 can be increased by arranging the breathing pipe 321 without affecting the communication between the air layer 210 and the breathing chamber 310, and since the inner diameter of the breathing pipe 321 is small, even if the transformer oil flows to the top plate 340 during transportation, the vertically upward breathing pipe 321 can limit the flow of the transformer oil to the breathing chamber 310, keeping the breathing chamber 310 dry and clean, and effectively improving the structural rationality of the breathing passage 320.

[0031] Further, the breathing passage 320 further comprises an oil prevention device, which can be a semi-permeable membrane with a specific pore size or similar oil-gas separation device, as long as it can ensure that air can pass through but transformer oil cannot pass through. Herein, it will not be repeated. The device is installed at the opening of the breathing pipe 321 or in the breathing pipe 321, and the oil prevention device is configured to allow air to pass through but not allow transformer oil to pass through, so that the oil prevention device can limit the flow of transformer oil through the breathing passage 320 to the breathing chamber 310. During the operation of the transformer, part of the transformer oil may be gasified and mixed into the air layer 210, by arranging the oil prevention device, the transformer oil molecules can be blocked, so as to avoid the normal transformer oil or the gasified transformer oil entering the breathing chamber 310 through the breathing pipe 321, effectively improving the filtering effect of the breathing passage 320.

[0032] Further, the second side plate 330, the top plate 340 and the first side plate 130 are fixedly connected by seamless welding, that is, the connection between the second side plate 330 and the top plate 340, the connection between the second side plate 330 and the bottom plate 120, and the connection between the top plate 340 and the second side plate 330 are all fixedly connected by seamless welding. By welding the second side plate 330, the top plate 340 and the first side plate 130 together, the structural stability and air tightness of the breathing chamber 310 are effectively improved, and the service life of the transformer is prolonged.

[0033] Referring to Figure 2 and Figure 3As shown, it can be understood that the breathing chamber 310 can be provided individually in the installation cavity 110 to save the production cost of the transformer; the breathing chamber 310 can also be provided in plurality, and when the breathing chamber 310 is provided in plurality, the plurality of breathing chambers 310 are staggered with the plurality of heat dissipation members outside the tank 100 along the circumference of the tank 100. The breathing chamber 310 is provided in plurality, even if the volume of the installation cavity 110 of the transformer is large, that is, the volume change of the transformer oil is large when the temperature changes, the plurality of breathing chambers 310 can also receive or release the air in the air layer 210 from the four sides of the core, avoiding the overpressure problem in the installation cavity 110, and effectively improving the operation stability of the transformer. In addition, the staggered arrangement of the breathing chamber 310 and the heat dissipation member outside the tank 100 can also avoid the interference of the breathing chamber 310 with the heat exchange between the transformer oil and the heat dissipation fins arranged outside the long side plate 132, and ensure the stable use of the transformer.

[0034] It can be understood that when the temperature around the transformer rises, the volume of the transformer oil increases and squeezes the air layer 210, and the squeezed air can enter the breathing chamber 310 through the breathing channel 320; when the temperature around the transformer decreases, the volume of the transformer oil decreases, and the air in the breathing chamber 310 returns to the air layer 210 above the transformer oil through the breathing channel 320. By providing the breathing chamber 310, the breathing chamber 310 is connected with the air layer 210 through the breathing channel 320, which can indirectly increase the overall volume of the air layer 210, even if the volume of the installation cavity 110 inside the transformer is different, the air layer 210 with the same height and the bottom height can be arranged, so that transformers with different volumes can use the same specification of pressure sleeve pipes and tap switches and other components, and the traditional oil pillow, breather and other components are saved, effectively reducing the management cost of the transformer; at the same time, the high pressure sleeve pipe and the tap switch and other components do not need to be customized to be higher, which ensures the mechanical strength of such components and improves the safety of the transformer during transportation. In addition, the air layer 210 can reduce the height of the original air layer 210 in the tank 100, thereby reducing the overall height of the transformer, so that the transformer can be applied to low space.

[0035] Referring to Figure 2 As shown, it needs to be supplemented that for the hexagonal tank 100, the six first side plates 130 are usually composed of three short side plates 131 with shorter width and three long side plates 132 with longer width, and the short side plates 131 with shorter length and the long side plates 132 with shorter length are staggered, at this time, the tank 100 is approximately an equilateral triangle in shape, thereby adapting to the three-dimensional core. The second side plate 330 is parallel to one of the short side plates 131, and the two sides of the second side plate 330 are connected with the long side plates 132 on the two sides of the short side plate 130 parallel to the second side plate 330.

[0036] The second side plate 330 and the shorter short side plate 131 are arranged in parallel, so that the breathing chamber 310 is located at the short side of the box body 100, the width of the second side plate 330 is limited between the short side plate 131 and the long side plate 132, under the premise that the breathing chamber 310 can accommodate enough air, the breathing chamber 310 avoids occupying too much space of the installation cavity 110 to limit the volume of the core, affects the installation of the core, and effectively improves the structural rationality of the transformer.

[0037] Referring to Figure 3 As shown in the figure, it can be understood that the breathing pipe 321 can be arranged separately to reduce the processing cost, and the breathing pipe 321 can also be provided with a plurality of breathing pipes 321, and the plurality of breathing pipes 321 are usually arranged on the top plate 340, and the oil-proof device and the breathing pipe 321 are arranged one by one. The breathing pipe 321 is provided as a plurality of breathing pipes 321, and each breathing pipe 321 is provided with an oil-proof device capable of filtering transformer oil, so that the channel area between the breathing chamber 310 and the air layer 210 is increased under the premise that the breathing chamber 310 is dry and clean, the airflow in the air layer 210 can quickly and in large quantities enter the air chamber, the transformer can adapt to the use environment with rapid temperature change, and the application range of the transformer is expanded.

[0038] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. An oil-immersed transformer, characterized by comprising: The utility model relates to a transformer core cooling device, comprising: a core; a box provided with a mounting cavity with a top opening, the core is accommodated in the mounting cavity, the mounting cavity is filled with transformer oil for immersing the core; a box cover connected with the box to close the mounting cavity, an air layer is formed between the transformer oil and the box cover; wherein, the mounting cavity is provided with a baffle assembly, the baffle assembly is located on one side of the core, a breathing chamber is formed between the baffle assembly and the inner wall of the box, the baffle assembly is provided with a breathing channel, the breathing channel is located above the transformer oil, the breathing chamber is communicated with the air layer through the breathing channel.

2. An oil immersed transformer according to claim 1, characterized in that The breathing chamber is provided with a plurality of breathing channels, the box is provided with a plurality of heat dissipation pieces outside, the breathing chamber and the heat dissipation piece are staggered along the circumference of the box.

3. An oil immersed transformer according to claim 2, characterized in that The box is hexagonal in shape, the hexagonal box comprises a bottom plate and six first side plates, the mounting cavity is formed between the bottom plate and the six first side plates, the baffle assembly comprises a second side plate and a top plate, the breathing channel is arranged on the top plate, the second side plate is located on one side of the core, in the vertical direction, both ends of the second side plate are connected with the bottom plate and the top plate respectively, the second side plate, the bottom plate, the top plate and at least one first side plate form the breathing chamber.

4. An oil immersed transformer according to claim 3, characterized in that The second side plate, the top plate and the first side plate are welded and fixed.

5. An oil immersed transformer according to claim 3, characterized in that The breathing channel comprises a breathing pipe, the breathing pipe is arranged in the vertical direction and extends upward and protrudes from the surface of the top plate.

6. An oil immersed transformer according to claim 5, characterised in that The breathing channel further comprises an oil entry prevention device, the oil entry prevention device is installed on the breathing pipe, and the oil entry prevention device is used for limiting the flow of transformer oil to the breathing chamber.

7. An oil immersed transformer according to claim 6, characterised in that The breathing pipe is provided with a plurality of breathing pipes, and the oil entry prevention device and the breathing pipe are one-to-one corresponding.

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