Oil-immersed transformer
By using L-shaped upper and lower clamps and iron core yokes in the oil-immersed transformer, combined with the inverted T-shaped tap switch and reasonable high-low voltage lead wiring design, the inconvenient problem of existing oil-immersed transformers in the tap switch installation and pressure regulation operation is solved, and the effect of compact structure, saving insulation oil, improving heat dissipation efficiency and reducing losses is achieved.
Patent Information
- Application Number
- CN202421679870.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The existing oil-immersed transformers are inconvenient in tap-off switch installation and voltage regulation operation, and the high and low voltage leads need to be lengthened, which wastes copper materials and increases losses. At the same time, the design of the core yoke clamp has problems such as wasting space and low heat dissipation efficiency.
An oil-immersed transformer is designed, using an L-shaped upper and lower clamping and an iron core yoke. The iron core yoke is clamped in the middle of the clamping, and a groove structure is provided at the bottom of the box to reduce the height of the iron core yoke. The tap switch adopts an inverted T-shaped structure, and the high and low-voltage lead wiring design is more reasonable.
It realizes the compact structure of the transformer, saves insulating oil, improves heat dissipation efficiency, simplifies high and low voltage lead wiring, reduces losses, and makes the tap switch position reasonable, safe and reliable.
Smart Images
Figure CN223038729U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power transmission and distribution in electric power engineering, and particularly relates to an oil-immersed transformer. Background Art
[0002] At present, the interior of the oil tank of an oil-immersed transformer is generally rectangular in shape. In order to ensure a certain live safety distance between the windings in the middle of the core body and the leads at the upper part, the upper, middle, and lower parts of the oil tank are designed to have the same dimensions. In order to facilitate a certain spatial arrangement of the tap changer, the tap changer is generally arranged between the high-voltage bushing and the low-voltage bushing under the tank cover, resulting in a sufficient live safety distance that must be left between the upper part of the core yoke and the tank cover. This makes it inconvenient during the installation and voltage regulation operation of the tap changer, and the high- and low-voltage leads of the transformer also need to be lengthened, wasting lead copper in the upper part of the oil tank and increasing lead losses. Conventional core yoke clamp parts generally use channel steel or steel plates bent into a "C" shape to clamp the core yoke. In particular, the lower clamp part occupies a relatively large geometric space, and the spaces on both sides of the lower clamp part to the oil tank wall are ineffective spaces, wasting insulating oil and affecting the heat dissipation efficiency. Content of the Utility Model
[0003] The purpose of the utility model is to provide an oil-immersed transformer to solve the problems raised in the above background art.
[0004] To achieve the above purpose, the utility model provides the following technical solution: An oil-immersed transformer includes a main body of the transformer oil tank. A plurality of windings are arranged in the middle of the main body of the transformer oil tank. A high-voltage lead is fixedly connected to the upper left side of the windings, and a low-voltage lead is fixedly connected to the upper right side of the windings. Upper clamp parts are fixedly connected to both sides of the upper end of the windings, and lower clamp parts are fixedly connected to both sides of the lower end of the windings. Both the upper clamp parts and the lower clamp parts are in an L-shaped structure. Core yokes are arranged at the upper and lower ends of the windings. The upper core yoke is clamped between the two upper clamp parts, and the lower core yoke is clamped between the two lower clamp parts. A bottom of the tank is arranged at the lower end of the main body of the transformer oil tank. A switch box is arranged on the left side of the main body of the transformer oil tank. A tank cover is fixedly connected to the upper ends of the main body of the transformer oil tank and the switch box. A tap changer is arranged in the switch box. A high-voltage bushing is fixedly connected to the upper left side of the tank cover, and a low-voltage bushing is fixedly connected to the upper right side of the tank cover. Short corrugated sheets are arranged on the left side of the main body of the transformer oil tank, and long corrugated sheets are arranged on the right side of the main body of the transformer oil tank.
[0005] Preferably, the bottom of the tank is in a groove structure. The lower clamp part is clamped at the connection between the bottom of the tank and the main body of the transformer oil tank. The lower core yoke is located in the groove of the bottom of the tank. An insulating shock pad is arranged inside the bottom of the tank.
[0006] Preferably, the tap changer is of an inverted T-shaped structure. The upper end of the tap changer is a rain-proof cap, which is located at the upper end of the tank cover. A sealing ring is provided at the connection between the rain-proof cap and the tank cover. The length of the lower end of the tap changer is shorter than that of the main body of the transformer oil tank, and the tap changer is located outside the high-voltage bushing.
[0007] Preferably, the upper end of the high-voltage lead wire is connected to the high-voltage bushing, and the tap wire of the high-voltage lead wire is led from the outside of the winding to be connected to the tap changer in the switch box.
[0008] Preferably, the lower wiring terminal of the low-voltage bushing is of a flat plate type, and the winding is led out by its own soft copper strip and can be directly vertically connected to the copper plate at the lower end of the low-voltage bushing.
[0009] Preferably, the iron core yoke is laminated with silicon steel sheets, and the cross-section of the iron core yoke is circular, oblong, oval or quasi-elliptical, etc.
[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0011] 1. The transformer can save more than 20% of insulating oil and ensure the heat dissipation efficiency at the same time;
[0012] 2. The connection of the high- and low-voltage lead wires is convenient, the operation is simple, copper materials are saved, the loss is reduced, the position arrangement of the tap changer is reasonable, and it is safe and reliable;
[0013] 3. The transformer has a compact structure and low noise. Description of the Drawings
[0014] Figure 1 It is a schematic diagram of the internal connection of the transformer.
[0015] Figure 2 It is a top view of the transformer.
[0016] In the figure: 1 high-voltage bushing, 2 tap changer, 3 tank cover, 4 switch box, 5 high-voltage lead wire, 6 short corrugated sheet, 7 winding, 8 tank bottom, 9 low-voltage bushing, 10 iron core yoke, 11 upper clamping piece, 12 low-voltage lead wire, 13 long corrugated sheet, 14 lower clamping piece, 15 insulating shock pad, 16 main body of the transformer oil tank. Detailed Embodiments
[0017] In order to deepen the understanding and recognition of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described and introduced in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments, and no formal restrictions are imposed on the present embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.
[0018] Please refer to Figure 1-2 , the present utility model provides a technical solution: an oil-immersed transformer, including a main transformer oil tank 16, in the middle of the main transformer oil tank 16 are provided a plurality of windings 7. On the upper left side of the winding 7 is fixedly connected a high-voltage lead 5, on the upper right side of the winding 7 is fixedly connected a low-voltage lead 12. On both sides of the upper end of the winding 7 are fixedly connected upper clamping members 11, and on both sides of the lower end of the winding 7 are fixedly connected lower clamping members 14. Both the upper clamping members 11 and the lower clamping members 14 are L-shaped structures. At the upper and lower ends of the winding 7 are provided core yokes 10. The upper core yoke 10 is clamped between the two upper clamping members 11, and the lower core yoke 10 is clamped between the two lower clamping members 14. At the lower end of the main transformer oil tank 16 is provided a tank bottom 8, on the left side of the main transformer oil tank 16 is provided a switch box 4. Fixedly connected to the upper ends of the main transformer oil tank 16 and the switch box 4 is a tank cover 3. Inside the switch box 4 is provided a tap changer 2. On the upper left side of the tank cover 3 is fixedly connected a high-voltage bushing 1, and on the upper right side of the tank cover 3 is fixedly connected a low-voltage bushing 9. On the left side of the main transformer oil tank 16 is provided a short corrugated sheet 6, and on the right side of the main transformer oil tank 16 is provided a long corrugated sheet 13.
[0019] The tank bottom 8 is of a groove structure. The lower clamping member 14 is clamped at the connection between the tank bottom 8 and the main transformer oil tank 16. The lower core yoke 10 is located in the groove of the tank bottom 8. Inside the tank bottom 8 is provided an insulating shock pad 15. The core yoke 10 is laminated with silicon steel sheet material. The cross-section of the core yoke 10 is circular, oblong, oval or quasi-elliptical, etc. The structure is simple, the installation is stable and reliable, and the noise is low. The upper clamping member 11 can make room for the installation of the tails of the high- and low-voltage bushings 9. The lower clamping member 14 and the tank bottom 8 are conformally installed.
[0020] The tap changer 2 has an inverted T-shaped structure. The upper end of the tap changer 2 is a rainproof cap, which is located at the upper end of the tank cover 3. A sealing ring is provided at the connection between the rainproof cap and the tank cover 3. The lower end of the tap changer 4 is shorter than the length of the main body of the transformer tank 16. The tap changer 2 is located outside the high-voltage bushing 1. The upper end of the high-voltage lead 5 is connected to the high-voltage bushing 1. The tap wire of the high-voltage lead 5 is led from the outside of the winding 7 to be connected to the tap changer 2 in the switch box 4. In this way, the wiring is more convenient and reasonable, and the operation difficulty of welding or cold pressing is reduced. There will be no cross interference between the high-voltage lead 5 and the tap lead, making the high-voltage lead 5 part safer and more reliable, and the wiring length of the tap lead is shorter.
[0021] The lower terminal of the low-voltage bushing 9 is of a flat plate type. The winding 7 is led out by its own soft copper strip and can be directly vertically connected to the copper plate at the lower end of the low-voltage bushing 9. The operation is simple and the connection is reliable. There is no need to weld an additional "C"-shaped soft copper strip, and the soft copper strip wiring length of the low-voltage lead 12 can be made the shortest, reducing the eddy current loss generated by the low-voltage large-current lead and the surrounding steel.
[0022] Although the embodiments of the present invention have been shown and described, it should be emphasized that the above description is only an introduction and description of the usage mode of the embodiments of the present invention, and does not impose any formal limitation on the present invention. For those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An oil-immersed transformer, comprising a transformer oil tank body (16), characterized in that: A plurality of windings (7) are provided in the middle of the transformer oil tank body (16); a high-voltage lead (5) is fixedly connected to the left side of the upper end of the winding (7); a low-voltage lead (12) is fixedly connected to the right side of the upper end of the winding (7); upper clamps (11) are fixedly connected to both sides of the upper end of the winding (7); lower clamps (14) are fixedly connected to both sides of the lower end of the winding (7); the upper clamps (11) and the lower clamps (14) are both L-shaped structures; an iron core yoke (10) is provided at the upper and lower ends of the winding (7); the upper iron core yoke (10) is clamped between the two upper clamps (11); and the lower iron core yoke (10) is fixedly connected to the lower end of the winding (7). ) is clamped between two lower clamps (14), the lower end of the transformer oil tank body (16) is provided with a tank bottom (8), the left side of the transformer oil tank body (16) is provided with a switch box (4), the upper ends of the transformer oil tank body (16) and the switch box (4) are fixedly connected with a tank cover (3), the switch box is provided with a tap switch, the upper left side of the tank cover (3) is fixedly connected with a high-voltage bushing (1), the upper right side of the tank cover (3) is fixedly connected with a low-voltage bushing (9), the left side of the transformer oil tank body (16) is provided with a short corrugated sheet (6), and the right side of the transformer oil tank body (16) is provided with a long corrugated sheet (13).
2. The oil-immersed transformer according to claim 1, characterized in that: The box bottom (8) is a groove-mounted structure, the lower clamp (14) is clamped at the connection between the box bottom (8) and the transformer oil tank body (16), the core yoke (10) below is located in the groove of the box bottom (8), and an insulating shock-absorbing pad (15) is provided inside the box bottom (8).
3. The oil-immersed transformer according to claim 1, characterized in that: The tap changer (2) is of an inverted T-shaped structure. The upper end of the tap changer (2) is a rainproof cap, which is located at the upper end of the box cover (3). A sealing ring is provided at the connection between the rainproof cap and the box cover (3). The lower end of the tap changer (2) is shorter than the main body of the transformer oil tank (16). The tap changer (2) is located outside the high-voltage bushing (1).
4. The oil-immersed transformer according to claim 1, characterized in that: The upper end of the high-voltage lead (5) is connected to the high-voltage bushing (1), and the tapping line of the high-voltage lead (5) is led from the outside of the winding (7) to the tapping switch (2) in the switch box (4) for connection.
5. The oil-immersed transformer according to claim 1, characterized in that: The lower connection terminal of the low-voltage bushing (9) is of a flat plate type, and the winding (7) is led out using its own soft copper sheet and can be directly vertically connected to the copper plate at the lower end of the low-voltage bushing (9).
6. The oil-immersed transformer according to claim 1, characterized in that: The core yoke (10) is made of stacked silicon steel sheets, and the cross section of the core yoke (10) is circular, oblong, elliptical or quasi-elliptical.