Three-phase combined transformer

Abstract

The utility model discloses a three-phase combined transformer, and relates to the technical field of transformers, the three-phase combined transformer comprises a base, a low-voltage wire outlet device, a neutral point wire outlet device and three single-phase transformers, the low-voltage wire outlet device is provided with three low-voltage bushings; the neutral point wire outlet device is provided with a neutral point sleeve; each single-phase transformer comprises an oil tank, the three single-phase transformers are installed on the base at intervals in the second horizontal direction, the tank walls of the two opposite sides of each oil tank in the first horizontal direction are provided with a high-voltage outgoing line interface and a neutral point outgoing line interface respectively, and the top tank wall of each oil tank is provided with a low-voltage outgoing line interface. The high-voltage outgoing line interfaces, the neutral point outgoing line interfaces and the low-voltage outgoing line interfaces of the single-phase transformers do not interfere with one another and do not affect interval arrangement of the three single-phase transformers, the line crossing situation during outgoing of the three-phase combined transformer is reduced, wiring is simple, the three-phase combined transformer is more compact in structure and reasonable in layout, and the occupied area is effectively saved.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a three-phase combined transformer. Background Technology

[0002] Three-phase combined transformers typically consist of three single-phase transformers. In existing three-phase combined transformers, the high-voltage, low-voltage, and neutral point outgoing interfaces are usually concentrated on the same side of the single-phase transformers. This centralized outgoing structure leads to mutual interference between the lines during outgoing circuitry, resulting in complex wiring. Furthermore, the centralized outgoing structure interferes with the arrangement of the three single-phase transformers. To avoid the outgoing structure, the three single-phase transformers need to be arranged far apart, significantly increasing the length of the three-phase combined transformer in one direction. This, in turn, increases the footprint of the three-phase combined transformer, making its structure less compact. Utility Model Content

[0003] The main purpose of this utility model is to propose a three-phase combined transformer, which aims to solve the technical problems of mutual interference between the outgoing lines of the existing three-phase combined transformer, complicated wiring, increased footprint, and insufficient compact structure.

[0004] To achieve the above objectives, the three-phase combined transformer proposed in this utility model includes a base, a low-voltage output device, a neutral point output device, and three single-phase transformers. The low-voltage output device is equipped with three low-voltage bushings; the neutral point output device is equipped with a neutral point bushing; each single-phase transformer includes an oil tank, the length, width, and height directions of which are respectively a first horizontal direction, a second horizontal direction, and a vertical direction; wherein the first horizontal direction is perpendicular to the second horizontal direction; the three single-phase transformers are spaced apart on the base along the second horizontal direction, and each oil tank is positioned along... High-voltage outgoing interfaces and neutral point outgoing interfaces are respectively provided on the opposite sides of the tank walls in the first horizontal direction, and low-voltage outgoing interfaces are provided on the top wall of each tank; the three neutral point outgoing interfaces of the three tanks are all connected to the neutral point outgoing device and are led out of the three-phase combined transformer through the neutral point bushing; the three low-voltage outgoing interfaces are all connected to the low-voltage outgoing device; the three low-voltage bushings are respectively provided corresponding to the three low-voltage outgoing interfaces; the three low-voltage outgoing interfaces are respectively led out of the three-phase combined transformer through the corresponding low-voltage bushings.

[0005] In one embodiment, the low-voltage output device further includes a housing and a copper busbar disposed within the housing. Each of the low-voltage bushings is disposed on the housing. Three low-voltage terminals are respectively disposed on the housing at positions corresponding to the three low-voltage output interfaces. The three low-voltage terminals are respectively connected to the corresponding low-voltage output interfaces. The copper busbar connects each low-voltage terminal to the corresponding low-voltage bushing.

[0006] In one embodiment, the housing has three independently arranged outlet chambers, with adjacent outlet chambers separated by an insulating partition; three low-voltage bushings are respectively arranged corresponding to the three outlet chambers, and three low-voltage terminals are respectively arranged corresponding to the three outlet chambers.

[0007] In one embodiment, each of the neutral point outgoing interfaces is connected to the neutral point outgoing device via a first flange, and each of the low-voltage terminals is connected to the corresponding low-voltage outgoing interface via a second flange.

[0008] In one embodiment, the neutral point output device further includes a wiring cable and three neutral point terminals, the three neutral point output terminals being respectively connected to the three neutral point output interfaces, and the wiring cable connecting each of the neutral point terminals to the neutral point sleeve.

[0009] In one embodiment, the high-voltage outlet, the low-voltage outlet, and the neutral point outlet are all provided with sealing gaskets.

[0010] In one embodiment, both the low-pressure bushing and the neutral point bushing are ceramic bushings, and the outer surface of the ceramic bushing is coated with an anti-flashover coating.

[0011] In one embodiment, the three-phase combined transformer further includes a cooling device, which is installed on the base and offset from each of the single-phase transformers, and the three single-phase transformers share the cooling device.

[0012] In one embodiment, the cooling device includes a radiator and a circulation pipe, wherein the circulation pipe connects the radiator and each of the oil tanks to form a circulating oil circuit, so as to dissipate heat from the oil in each of the oil tanks through the radiator.

[0013] In one embodiment, the base is a steel base, which is connected to the foundation by anchor bolts.

[0014] The three-phase combined transformer proposed in this invention arranges three single-phase transformers at intervals on a base, with the arrangement direction of the three single-phase transformers consistent with the short side direction of each single-phase transformer. This makes the lengths of the three-phase combined transformer in the first and second horizontal directions as close as possible, resulting in a more compact and coordinated overall size. The high-voltage and neutral point outgoing interfaces of each single-phase transformer are respectively located on both sides of its long side, while the low-voltage outgoing interface is located on the top of the single-phase transformer. This ensures that the high-voltage, neutral point, and low-voltage outgoing interfaces of each single-phase transformer do not interfere with each other, reducing line crossings when the three-phase combined transformer outputs, and simplifying wiring. In addition, the low-voltage outgoing line device and the neutral point outgoing line device are respectively set on the top of each single-phase transformer and on one side along the long side, so that the outgoing line structure of the three-phase combined transformer is dispersed. The setting of the outgoing line structure does not affect the arrangement of the three single-phase transformers. Thus, the three single-phase transformers do not need to be arranged far apart to avoid the outgoing line structure, making the structure of the three-phase combined transformer more compact, the layout more reasonable, and effectively saving the floor space. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A top view of an embodiment of the three-phase combined transformer provided by this utility model;

[0017] Figure 2 This is a side view of an embodiment of the three-phase combined transformer provided by this utility model.

[0018] Explanation of icon numbers:

[0019] 10. Base; 20. Low-voltage output device; 21. Low-voltage bushing; 30. Neutral point output device; 31. Neutral point bushing; 40. Single-phase transformer; 41. Oil tank; 42. High-voltage output interface; 43. Neutral point output interface; 44. Low-voltage output interface; 50. Cooling device.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] In this utility model, the descriptions of directions such as "up", "down", "front", "back", "left", and "right" are as follows: Figure 1 and Figure 2 The directions shown are for reference only and are used to interpret the location. Figure 1 and Figure 2 The relative positional relationship between the components in the shown posture is such that if the specific posture changes, the directional indication will also change accordingly.

[0025] In existing three-phase combined transformers, the high-voltage, low-voltage, and neutral point outgoing interfaces are typically concentrated on the same side of the single-phase transformer. This centralized outgoing structure leads to mutual interference between the lines during outgoing circuits, resulting in complex wiring. Furthermore, the centralized outgoing structure interferes with the arrangement of the three single-phase transformers. To avoid the outgoing structure, the three single-phase transformers need to be arranged far apart, significantly increasing the length of the three-phase combined transformer in one direction. This, in turn, increases the footprint of the three-phase combined transformer, making its structure less compact.

[0026] This utility model proposes a three-phase combined transformer, including a base 10, a low-voltage output device 20, a neutral point output device 30, and three single-phase transformers. The low-voltage output device 20 is equipped with three low-voltage bushings 21; the neutral point output device 30 is equipped with a neutral point bushing 31; each single-phase transformer includes an oil tank 41, the length direction, width direction, and height direction of each oil tank 41 being a first horizontal direction, a second horizontal direction, and a vertical direction, respectively; wherein, the first horizontal direction is perpendicular to the second horizontal direction; the three single-phase transformers are installed at intervals on the base 10 along the second horizontal direction, and each oil tank 41 is installed along the first horizontal direction. High-voltage outgoing interface 42 and neutral point outgoing interface 43 are respectively provided on the opposite sides of the tank wall in the horizontal direction, and low-voltage outgoing interface 44 is provided on the top tank wall of each tank 41; the three neutral point outgoing interfaces 43 of the three tanks 41 are all connected to the neutral point outgoing device 30, and are led out of the three-phase combined transformer through the neutral point bushing 31. The three low-voltage outgoing interfaces 44 are all connected to the low-voltage outgoing device 20, and the three low-voltage bushings 21 are respectively provided for the three low-voltage outgoing interfaces 44. The three low-voltage outgoing interfaces 44 are led out of the three-phase combined transformer through the corresponding low-voltage bushings 21.

[0027] Please see Figure 1 and Figure 2 The first horizontal direction is Figure 1 The front-to-back direction, the second horizontal direction is Figure 1 and Figure 2 The left and right directions, and the vertical direction are... Figure 2 The vertical direction within the tank is as follows. It should be noted that the length of each single-phase transformer is greater than its width; that is, the length direction of the tank 41 is the long side direction of each single-phase transformer, and the width direction of the tank 41 is the short side direction of each single-phase transformer. The three single-phase transformers are designated as A-phase transformer, B-phase transformer, and C-phase transformer, and are arranged alternately along the left-right direction, with the arrangement direction of the three single-phase transformers consistent with the short side direction of each single-phase transformer. High-voltage outgoing interface 42 and neutral point outgoing interface 43 are respectively provided on the two side walls of the tank along the long side of each single-phase transformer, and a low-voltage outgoing interface 44 is provided on the top wall of the tank. The neutral terminal of each single-phase transformer is connected to the neutral point output device 30 through the neutral point output interface 43, and is led out of the three-phase combined transformer through the neutral point bushing 31 on the neutral point output device 30; the low-voltage terminal of each single-phase transformer 40 is connected to the low-voltage output device 20 through the low-voltage output interface 44, and is led out of the three-phase combined transformer through the corresponding low-voltage bushing 21; the high-voltage terminal of each single-phase transformer is directly led out of the three-phase combined transformer through the high-voltage output interface 42.

[0028] The three-phase combined transformer proposed in this utility model arranges three single-phase transformers at intervals on the base 10. The arrangement direction of the three single-phase transformers is consistent with the short side direction of each single-phase transformer, making the lengths of the three-phase combined transformer in the first horizontal direction and the second horizontal direction as close as possible, resulting in a more compact and coordinated overall size. The high-voltage output interface 42 and neutral point output interface 43 of each single-phase transformer are respectively located on both sides of the single-phase transformer along its long side, while the low-voltage output interface 44 is located on the top of the single-phase transformer. This ensures that the high-voltage output interface 42, neutral point output interface 43, and low-voltage output interface 44 of each single-phase transformer do not interfere with each other, reducing line crossings when the three-phase combined transformer outputs, and simplifying wiring. In addition, the low-voltage outgoing line device 20 and the neutral point outgoing line device 30 are respectively installed on the top of each single-phase transformer and on one side along the long side, so that the outgoing line structure of the three-phase combined transformer is dispersed. The setting of the outgoing line structure does not affect the arrangement of the three single-phase transformers. Thus, the three single-phase transformers do not need to be arranged far apart to avoid the outgoing line structure, making the structure of the three-phase combined transformer more compact, the layout more reasonable, and effectively saving the floor space.

[0029] In one embodiment, the low-voltage output device 20 further includes a housing and a copper busbar disposed within the housing. Each low-voltage bushing 21 is disposed on the housing. Three low-voltage terminals are respectively disposed on the housing at positions corresponding to the three low-voltage output interfaces 44. The three low-voltage terminals are respectively connected to the corresponding low-voltage output interfaces 44. The copper busbar connects each low-voltage terminal to the corresponding low-voltage bushing 21.

[0030] It can be explained that three low-voltage bushings 21 are spaced apart along the second horizontal direction on the housing and correspond one-to-one with three low-voltage terminals. The three low-voltage bushings 21 are located at the top of the housing, and the three low-voltage terminals are located at the bottom of the housing. The housing supports the low-voltage bushings 21 and the low-voltage terminals and accommodates copper busbars. The copper busbars connect the low-voltage bushings 21 to the corresponding low-voltage terminals, thereby enabling the low-voltage terminals of the corresponding single-phase transformers to be led out through the low-voltage bushings 21. The low-voltage outgoing line device 20 can be pre-fabricated. During on-site installation of the three-phase combined transformer, it is only necessary to connect the three low-voltage terminals to the corresponding three low-voltage outgoing line interfaces 44 to connect the low-voltage outgoing line device 20 to the three single-phase transformers, eliminating the need for on-site wiring and facilitating installation and maintenance.

[0031] In one embodiment, the housing has three independently arranged cable outlet chambers, with adjacent cable outlet chambers separated by an insulating partition; three low-voltage bushings 21 are respectively arranged corresponding to the three cable outlet chambers, and three low-voltage terminals are respectively arranged corresponding to the three cable outlet chambers.

[0032] Furthermore, each outgoing chamber is equipped with a low-voltage bushing 21 and a low-voltage terminal block on opposite sides along the first horizontal direction. The low-voltage terminal block is located on the side of the outgoing chamber facing the corresponding single-phase transformer, facilitating connection with the low-voltage outgoing interface 44 of the single-phase transformer. The low-voltage bushing 21 and low-voltage terminal block in each outgoing chamber are connected by copper busbars to form an independent current transmission channel, allowing current to be transmitted from the low-voltage outgoing interface 44 through the terminal block and copper busbar to the low-voltage bushing 21, thus completing the low-voltage outgoing function. Insulating partitions are installed between adjacent outgoing chambers to isolate them from each other, preventing current interference between different phases and improving the electrical insulation performance of the entire device, ensuring the safety and stability of current transmission.

[0033] In one embodiment, each neutral point outlet interface 43 is connected to the neutral point outlet device 30 via a first flange, and each low-voltage terminal is connected to the corresponding low-voltage outlet interface 44 via a second flange.

[0034] Understandably, each neutral point outgoing interface 43 is connected to the corresponding neutral point outgoing terminal on the neutral point outgoing device 30 via a first flange, and each low-voltage outgoing interface 44 is connected to the corresponding low-voltage outgoing terminal on the low-voltage outgoing device 20 via a second flange. It should be noted that both the first and second flanges utilize existing technology, each comprising two flange plates and multiple bolts, which tightly connect the two flange plates. The arrangement of the first and second flanges facilitates the connection between the neutral point outgoing interface 43 and the neutral point outgoing device 30, and between the low-voltage terminal and the low-voltage outgoing interface 44. Connection is completed simply by aligning the corresponding flange plates and tightening the bolts, eliminating the need for complex wiring and welding operations, greatly simplifying the installation process and improving installation efficiency.

[0035] In one embodiment, the neutral point output device 30 further includes a wiring cable and three neutral point terminals. The three neutral point output terminals are respectively connected to three neutral point output interfaces 43, and the wiring cable connects each neutral point terminal to the neutral point sleeve 31.

[0036] Similarly, three neutral point terminals are spaced apart along the second horizontal direction and respectively corresponding to the three neutral point output interfaces 43. The three neutral point terminals are connected to the neutral point bushing 31 through a connecting cable, so that the neutral point output terminals of the three single-phase transformers are combined and led out of the three-phase combined transformer. The neutral point output device 30 makes the neutral point output of the three-phase combined transformer neater, facilitates installation, maintenance and repair, and improves the maintainability of the entire transformer.

[0037] In one embodiment, the high-voltage outlet 42, the low-voltage outlet 44, and the neutral point outlet 43 are all provided with sealing gaskets.

[0038] Understandably, the sealing gaskets are installed at the connection points of the high-voltage output interface 42, the low-voltage output interface 44, and the neutral point output interface 43, respectively. Through elastic deformation, they fill the tiny gaps at the connection points, forming a tight sealing layer to prevent external moisture, dust, and other impurities from entering the transformer. At the same time, they prevent the leakage of internal insulating oil and other substances, ensuring the stability and safety of the internal environment of each single-phase transformer.

[0039] In one embodiment, both the low-pressure bushing 21 and the neutral point bushing 31 are ceramic bushings, and the outer surface of the ceramic bushing is coated with an anti-flashover coating.

[0040] It can be explained that the neutral point bushing 31 and the three low-voltage bushings 21 are all ceramic bushings coated with anti-flashover paint. The good insulation and high temperature resistance of the ceramic bushing are combined with the water repellency and weather resistance of the anti-flashover paint, which further improves the insulation performance and anti-flashover capability of the neutral point bushing 31 and the low-voltage bushings 21. This results in a significant improvement in the insulation performance, anti-flashover capability and operational reliability of the three-phase combined transformer, and effectively extends the service life of the three-phase combined transformer.

[0041] In one embodiment, the three-phase combined transformer further includes a cooling device 50, which is mounted on the base 10 and offset from each single-phase transformer, and the three single-phase transformers share the cooling device 50.

[0042] Please see Figure 2 The cooling device 50 is located on one side of the three single-phase transformers along the second horizontal direction, so that the cooling device 50 and the three single-phase transformers are staggered, avoiding mutual interference between the cooling device 50 and the single-phase transformers. This keeps the single-phase transformers that generate heat during operation away from the cooling device 50 that dissipates heat, which is beneficial to the cooling device 50's own heat dissipation and the convenience of maintenance and operation.

[0043] In one embodiment, the cooling device 50 includes a radiator and a circulation pipe, the circulation pipe connecting the radiator and each oil tank 41 to form a circulating oil circuit, so as to dissipate heat from the oil in each oil tank 41 through the radiator.

[0044] Furthermore, the radiator includes multiple heat dissipation fins, possessing a large heat dissipation area and efficient heat exchange capacity, enabling it to quickly dissipate heat from the oil to the surrounding environment. The circulation pipe is responsible for transporting the oil from each single-phase transformer tank 41 to the radiator for cooling, and then returning the cooled oil to each tank 41, forming a closed and continuous circulating oil circuit. During the circulation process, the oil temperature continuously decreases under the action of the circulation pipe and the radiator, ensuring that the single-phase transformer remains within a suitable temperature range during operation.

[0045] In one embodiment, the base 10 is a steel base 10, and the base 10 is connected to the foundation by anchor bolts.

[0046] It can be noted that the steel base 10 has good load-bearing capacity and light weight, which can stably support three single-phase transformers, cooling device 50 and other auxiliary devices, and effectively reduce the self-weight of the three-phase combined transformer, preventing deformation caused by excessive foundation pressure. Anchor bolts are installed at the four corners or edges of the base 10, and are fixed to the foundation through bolt holes pre-embedded in the foundation, ensuring a tight and firm connection between the base 10 and the foundation, effectively preventing displacement and overturning of the base 10, and ensuring the stable operation of the entire three-phase combined transformer.

[0047] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A three-phase combined transformer, characterized in that, include: Base; A low-voltage outgoing line device, wherein the low-voltage outgoing line device is provided with three low-voltage bushings; A neutral point output device, wherein the neutral point output device is provided with a neutral point sleeve; Three single-phase transformers are provided, each including an oil tank. The length, width, and height directions of each oil tank are respectively a first horizontal direction, a second horizontal direction, and a vertical direction; wherein, the first horizontal direction is perpendicular to the second horizontal direction; the three single-phase transformers are installed at intervals on the base along the second horizontal direction, and each oil tank has a high-voltage output interface and a neutral point output interface on its opposite sides along the first horizontal direction, and a low-voltage output interface is provided on the top wall of each oil tank; The three neutral point outgoing interfaces of the three oil tanks are all connected to the neutral point outgoing device and are led out of the three-phase combined transformer through the neutral point bushing. The three low-voltage outgoing interfaces are all connected to the low-voltage outgoing device. The three low-voltage bushings are respectively set for the three low-voltage outgoing interfaces, and the three low-voltage outgoing interfaces are led out of the three-phase combined transformer through the corresponding low-voltage bushings.

2. The three-phase combined transformer as described in claim 1, characterized in that, The low-voltage outgoing line device further includes a housing and a copper busbar disposed within the housing. Each of the low-voltage bushings is disposed on the housing. Three low-voltage terminals are respectively disposed on the housing at positions corresponding to the three low-voltage outgoing line interfaces. The three low-voltage terminals are respectively connected to the corresponding low-voltage outgoing line interfaces. The copper busbar connects each low-voltage terminal to the corresponding low-voltage bushing.

3. The three-phase combined transformer as described in claim 2, characterized in that, The housing has three independently arranged cable outlet chambers, with two adjacent cable outlet chambers separated by an insulating partition; three low-voltage bushings are respectively arranged corresponding to the three cable outlet chambers, and three low-voltage terminals are respectively arranged corresponding to the three cable outlet chambers.

4. The three-phase combined transformer as described in claim 2, characterized in that, Each of the neutral point outgoing interfaces is connected to the neutral point outgoing device via a first flange, and each of the low-voltage terminals is connected to the corresponding low-voltage outgoing interface via a second flange.

5. The three-phase combined transformer as described in claim 1, characterized in that, The neutral point output device also includes a wiring cable and three neutral point terminals. The three neutral point terminals are respectively connected to the three neutral point output interfaces, and the wiring cable connects each neutral point terminal to the neutral point sleeve.

6. The three-phase combined transformer as described in any one of claims 1 to 5, characterized in that, The high-voltage outlet, the low-voltage outlet, and the neutral point outlet are all equipped with sealing gaskets.

7. The three-phase combined transformer as described in any one of claims 1 to 5, characterized in that, Both the low-pressure bushing and the neutral point bushing are ceramic bushings, and the outer surface of the ceramic bushing is coated with an anti-flashover coating.

8. The three-phase combined transformer as described in any one of claims 1 to 5, characterized in that, The three-phase combined transformer also includes a cooling device, which is installed on the base and offset from each of the single-phase transformers. The three single-phase transformers share the cooling device.

9. The three-phase combined transformer as described in claim 8, characterized in that, The cooling device includes a radiator and a circulation pipe. The circulation pipe connects the radiator and each of the oil tanks to form a circulating oil circuit, so as to dissipate heat from the oil in each of the oil tanks through the radiator.

10. The three-phase combined transformer as described in any one of claims 1 to 5, characterized in that, The base is a steel base, which is connected to the foundation by anchor bolts.

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