500kV transformer wall-mounted radiator cooling system
Through the wall-mounted flap structure and reinforced iron design, the problems of large width of the 500kV transformer and magnetic leakage overheating are solved, wider inspection channels and higher cooling efficiency are achieved, and costs are reduced.
Patent Information
- Application Number
- CN202422268955.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The existing cooling system of 500kV transformer results in a large transformer width and a narrow width of the inspection channel, which is inconvenient for on-site operation and maintenance management. At the same time, there is a problem of local overheating of the fuel tank caused by magnetic leakage, and it is relatively expensive.
The wall-mounted sheet-scattered structure is adopted, and the crowding bus tube is cancelled, and the sheet-scattered is directly connected through the oil tank pipe joints, which increases the width of the inspection channel, and reinforces iron is welded on the outer wall of the oil tank, and a molded angle ring is set to prevent magnetic leakage and overheating, and optimizes the cooling system.
It improves the width of the inspection channel, facilitates operation and maintenance management, reduces the cost of transformers, enhances mechanical strength, solves the problem of local overheating of the fuel tank, and improves cooling efficiency and overall performance.
Smart Images
Figure CN223167318U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of transformer manufacturing, and relates to a wall-mounted fin radiator cooling system for a 500 kV transformer. Background Technique
[0002] For the 500 kV transformer of the State Grid project, the cooling method is ONAF (oil-immersed air-cooled). The fin radiators that make up the cooling system are arranged on both sides of the transformer oil tank. The fin radiators are connected to the transformer oil tank through a busbar header and a cooling connecting pipe. This cooling structure will cause the transformer to be wider, resulting in a smaller distance between the fin radiators and the substation firewall, thus leading to a narrower inspection passage width, which is not convenient for on-site operation and maintenance management to a certain extent.
[0003] In this case, by reducing the width of the fin radiator, the width of the inspection passage can be increased. However, in order to ensure the cooling area of the transformer fin radiator, one is to increase the length of the fin radiator. Since the fans are all bottom-blow type, this improved structure will cause the fans to not blow to the upper part of the fin radiator, affecting the cooling efficiency; the other is to increase the number of fin radiators. This situation will cause the overall length of the transformer oil tank to become larger and the number of fans to increase, resulting in an increase in the cost of the transformer.
[0004] In view of this, by canceling the busbar header and directly installing the fin radiator on the transformer oil tank, the width of the transformer can be reduced, thereby reducing the consumption of steel and transformer oil, lowering the manufacturing cost of the transformer, and at the same time improving the installation efficiency of the transformer. However, this method requires drilling holes and welding pipe joints on the oil tank wall to install the fin radiator, which may cause local overheating of the transformer oil tank due to transformer leakage magnetic field. Summary of the Invention
[0005] In order to solve the above technical problems, a cooling system for a 500 kV transformer with a wall-mounted fin radiator structure is invented to increase the width of the substation inspection passage and facilitate on-site operation and maintenance management. The technical solution adopted by the utility model is as follows:
[0006] The wall-mounted fin radiator cooling system for a 500 kV transformer includes fin radiator II and a fan. The fan is fixedly installed below the bottom of fin radiator II. A number of upper fin radiator pipe joints and lower fin radiator pipe joints are respectively arranged at the top and bottom of fin radiator II. The lower fin radiator pipe joint is a horizontal straight pipe structure, and the upper fin radiator pipe joint is a sunken bent structure. A number of oil tank pipe joints respectively correspond to a number of upper fin radiator pipe joints and lower fin radiator pipe joints. One end of the oil tank pipe joint is respectively connected to the top of the side wall of the transformer oil tank and the bottom of the side wall of the transformer oil tank, and the other end of the oil tank pipe joint is connected to the upper fin radiator pipe joint and the lower fin radiator pipe joint respectively through a flange and a connecting flange. A number of vertical channel-shaped reinforcing irons are arranged on the outer wall of the transformer oil tank, and a number of horizontal reinforcing irons are welded on the outer wall of the transformer oil tank. Both ends of the reinforcing iron are welded into one body with the adjacent channel-shaped reinforcing iron, or both ends of the reinforcing iron are welded into one body with the adjacent oil tank pipe joint, or both ends of the reinforcing iron are welded into one body with the adjacent oil tank pipe joint and channel-shaped reinforcing iron.
[0007] Preferably, it includes a formed angle ring. The formed angle ring is a cylindrical structure with a skirt on one end of its outer circumference, and a number of through holes are evenly arranged on the skirt of the formed angle ring.
[0008] Preferably, a row of round through holes I are respectively arranged at the upper and lower parts of the side wall of the oil tank. The inner diameter of the round through hole I is larger than the outer diameter of the oil tank pipe joint. A number of vertical magnetic shields are located on the inner wall of the transformer oil tank. A round through hole II is opened at the middle position between the adjacent magnetic shields corresponding to the round through hole I. The formed angle ring is fixedly installed in the round through hole II, and the outer diameter of the formed angle ring fits the inner diameter of the round through hole II. The cloth tape passes through the through holes on the skirt of the formed angle ring and is tied to the adjacent magnetic shield.
[0009] Preferably, the oil tank pipe joint is made of DN80 seamless steel pipe.
[0010] Preferably, the channel-shaped reinforcing iron is made of 10 mm ordinary carbon steel plate and is in a dovetail structure. Hoisting lugs in an inverted pear shape are welded to the upper parts of the channel-shaped reinforcing irons on both sides. Jack lifting platforms are arranged at the upper and lower parts of the channel-shaped reinforcing iron.
[0011] The advantages of the present utility model are as follows:
[0012] The present utility model designs a cooling system for a 500 kV transformer with a wall-mounted fin radiator structure, which increases the width of the inspection passage and is convenient for on-site operation and maintenance management of the transformer. At the same time, by welding a number of horizontal reinforcing irons, the mechanical strength of the wall-mounted fin radiator structure is ensured, which is of great significance for ensuring the safe and stable operation of the transformer. Description of the Drawings
[0013] Figure 1 It is a schematic structural diagram of the existing fin radiator connected to the oil tank through a busbar collector.
[0014] Figure 2 It is a schematic structural diagram of the wall-mounted fin cooling system of a 500 kV transformer according to an embodiment of the present utility model;
[0015] Figure 3 It is a schematic structural diagram of the mechanical strength reinforcement of the oil tank pipe joint according to an embodiment of the present utility model;
[0016] Figure 4 It is a schematic diagram of the magnetic shielding opening according to an embodiment of the present utility model;
[0017] Figure 5 It is a schematic diagram of the formed angle ring according to an embodiment of the present utility model. 5a is the front view of the formed angle ring, and 5b is the top view of the formed angle ring;
[0018] Figure 6 It is a schematic diagram of the cooperation of the oil tank side wall opening, magnetic shielding and formed angle ring according to an embodiment of the present utility model;
[0019] Among them, 1 - fin one, 2 - fan, 3 - bus duct, 4 - cooling connection pipe, 5 - substation firewall, 6 - oil tank pipe joint, 7 - channel - type reinforcing iron, 8 - reinforcing iron, 9 - magnetic shielding, 10 - formed angle ring, 11 - fin two, 12 - upper pipe joint of the fin, 13 - lower pipe joint of the fin. Specific embodiments
[0020] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:
[0021] As Figure 1 shown, in the existing fin cooling system of a 500 kV transformer, the fin one 1 is connected to the transformer oil tank through the bus duct 3 and the cooling connection pipe 4. One end of the cooling connection pipe 4 is respectively connected to the top wall and the bottom of the side wall of the oil tank, and then the other end of the cooling connection pipe 4 is connected to the bus duct 3. The bus duct 3 is connected to the fin one 1, and the pipe joints connecting the fin one 1 and the bus duct 3 are respectively located at the upper and lower ends of the fin one 1. Since the bus duct 3 is located between the fin one 1 and the transformer oil tank and occupies a certain space, the distance between the fin one 1 and the substation firewall 5 is small, resulting in inconvenience for on - site inspection, operation and maintenance management of the transformer.
[0022] As Figures 2-6As shown in the figure, a wall-mounted fin radiator cooling system for a 500 kV transformer includes a second fin radiator 11, a fan 2, an oil tank pipe joint 6, a reinforcing iron 8, and a formed angle ring 10. One end of the oil tank pipe joint 6 is connected to the top and bottom of the side wall of the transformer oil tank. The other end of the oil tank pipe joint 6 is respectively connected to the upper fin radiator pipe joint 12 and the lower fin radiator pipe joint 13 of the second fin radiator 11 through connecting flanges. The fan 2 is fixedly installed below the bottom of the second fin radiator 11, and the fan 2 blows air to the second fin radiator 11 to cool the transformer oil. The specific number of the upper fin radiator pipe joint 12 and the lower fin radiator pipe joint 13 can be flexibly arranged according to the actual heat dissipation requirements.
[0023] In order not to affect the fixed connection between the second fin radiator 11 and the transformer oil tank through connecting flanges and bolts, and considering a better heat dissipation effect, the second fin radiator 11 is arranged as high as possible. Generally, it is ensured that the top of the second fin radiator 11 is more than half a meter higher than the cover of the transformer oil tank. The second fin radiator 11 adopts a special type of fin radiator structure, that is: the lower fin radiator pipe joint 13 is a horizontal straight pipe structure, and the upper fin radiator pipe joint 12 is a sunken bending structure. The sunken bending structure includes an upper long horizontal straight pipe, a middle vertical pipe, and a lower short horizontal straight pipe formed integrally by bending. The oil tank pipe joint 6 is welded on the side wall of the transformer oil tank. The oil tank pipe joint 6 adopts a DN80 seamless steel pipe. One end of the oil tank pipe joint 6 is welded integrally with the wall of the transformer oil tank. The oil tank pipe joint 6 communicates with the inside of the transformer oil tank. The other end of the oil tank pipe joint 6 is welded integrally with a flange plate. The oil tank pipe joint 6 can facilitate the installation of the second fin radiator 11.
[0024] The height direction position and spacing of adjacent oil tank pipe joints 6 are designed corresponding to the interface positions of the upper fin radiator pipe joint 12 and the lower fin radiator pipe joint 13 of the second fin radiator 11; for the convenience of design, the width direction spacing of adjacent oil tank pipe joints 6 needs to take into account the widths of the second fin radiator 11 and the magnetic shield 9 on the inner wall of the oil tank, as well as the installation dimensions of the fan 2 below the second fin radiator 11. In view of the fact that the second fin radiator 11 is a cantilever beam installation structure, the mechanical strength problem of the oil tank pipe joint 6 needs to be considered. A horizontal reinforcing iron 8 is welded on the outer wall of the transformer oil tank. Both ends of the reinforcing iron 8 are welded integrally with adjacent channel-shaped reinforcing irons 7; or, both ends of the reinforcing iron 8 are welded integrally with adjacent oil tank pipe joints 6; or, both ends of the reinforcing iron 8 are welded integrally with adjacent oil tank pipe joints 6 and channel-shaped reinforcing irons 7. By welding several reinforcing irons 8, finally, the oil tank pipe joint 6 is connected integrally with the wall of the transformer oil tank and the channel-shaped reinforcing iron 7, ensuring relatively uniform stress. The support structure of the second fin radiator 11 can also be considered and will not be elaborated in this utility model.
[0025] The grooved reinforcing iron 7 is used to reinforce the outer periphery of the 500 kV transformer oil tank, and its function is to prevent the oil tank from deforming due to vacuum pumping during the positive and negative pressure tests of the oil tank. The grooved reinforcing iron 7 is made of 10 mm ordinary carbon steel plate (20#) and has a width of about 400 mm. It has a dovetail structure and high tensile strength and mechanical strength. Hoisting lugs with an inverted pear-shaped structure need to be welded by drilling holes at the upper parts of the grooved reinforcing irons 7 on both sides. The function of the hoisting lugs is to facilitate the overall hoisting and transportation of the oil tank; jack lifting platforms also need to be designed at the upper and lower parts of the grooved reinforcing iron 7.
[0026] The magnetic shield 9 inside the transformer oil tank cooperates with the formed angle ring 10 to solve the problem of local overheating of the oil tank caused by transformer leakage magnetic flux. The formed angle ring 10 is installed at the opening of the magnetic shield 9 of the transformer oil tank. The formed angle ring 10 is a cylindrical structure with a skirt integrally formed at one end of its outer periphery. A number of through holes are evenly arranged on the skirt of the formed angle ring 10, and a white cloth tape is passed through the through holes on the skirt to tie the formed angle ring 10 to the adjacent magnetic shield 9. The formed angle ring 10 can ensure that there is enough insulation distance between the lead wire here and the opening magnetic shield 9 to prevent the generation of partial discharge. At the same time, the formed angle ring 10 is reliably tied and fixed to the magnetic shield 9 to prevent the formed angle ring 10 from flowing into the transformer oil tank along with the oil flow. By setting the formed angle ring 10, the problem of local overheating of the oil tank caused by transformer leakage magnetic flux is solved.
[0027] Figure 4 In it, the magnetic shield 9 needs to be laid on the inner wall of the oil tank to block the leakage magnetic flux and avoid overheating of the oil tank. The magnetic shield 9 in the vertical direction is located on the inner wall of the transformer oil tank. The magnetic shield 9 is arranged according to the existing structure. A round through hole 1 needs to be opened on the side wall of the transformer oil tank at the welded oil tank pipe joint 6. The interface of the sheet radiator 11 is divided into upper and lower parts. A row of round through holes 1 are arranged on both the upper and lower parts of the oil tank side wall. The inner diameter of the round through hole 1 is slightly larger than the outer diameter of the oil tank pipe joint 6, and the oil tank pipe joint 6 is inserted into the round through hole 1 on the side wall of the oil tank and welded. Although a row of round through holes 1 in the upper part of the oil tank avoids the laying range of the magnetic shield 9, a row of round through holes 1 in the lower part of the oil tank is within the laying range of the magnetic shield 9. Therefore, round through holes 2 need to be opened at the corresponding positions at the lower part of the magnetic shield 9 to cooperate with the round through holes 1 to ensure the smooth flow of the transformer oil.
[0028] Depending on the laying situation of the magnetic shield 9, the opening situation of the magnetic shield 9 is different. In order to reduce the damage degree and processing difficulty of the magnetic shield 9, a number of circular through-holes two corresponding to the circular through-holes one are evenly arranged in the middle of two adjacent magnetic shields 9, and a formed angle ring 10 is installed in the circular through-holes two for protection. The opening size of the circular through-holes two at the magnetic shield 9 should be as small as possible as long as it does not affect the oil flow. Generally, it is designed according to "the diameter of the opening size of the circular through-holes two at the magnetic shield 9 ≈ the diameter of the opening size of the circular through-holes one on the side wall of the oil tank + 10 mm". Increasing 10 mm can not only facilitate the installation of the formed angle ring 10, but also make the outer diameter of the formed angle ring 10 fit with the inner diameter of the circular through-holes two, which can prevent the leakage of magnetic flux into the oil tank wall due to the too large opening of the circular through-holes two at the magnetic shield 9, resulting in local overheating problems.
[0029] Through the above technical innovation, the embodiment of the present utility model fully solves the problems that the width of the transformer is relatively large, resulting in a small distance between the original sheet radiator 1 and the substation firewall 5, thus leading to a narrow width of the inspection passage and being inconvenient for on-site operation and maintenance management of the transformer, and the local overheating problem of the oil tank caused by the magnetic leakage of the transformer. At the same time, the manufacturing cost of the transformer is reduced, thereby improving the overall performance of the transformer and the market competitiveness of the transformer. After comparison, when the same transformer adopts the wall-mounted sheet radiator cooling system of the embodiment of the present utility model, the overall width of the 500 kV transformer can be reduced by 1 meter, that is, the width of each side of the inspection passage can be increased by 0.5 meter.
[0030] The existing 500 kV transformer sheet radiator cooling system adopts the traditional structure of "cooling connecting pipe + bus collecting main pipe". Although it can reduce the number of openings on the oil tank and is beneficial to the arrangement of the reinforcing iron on the outer periphery of the oil tank, the wall-mounted sheet radiator cooling system provided by the embodiment of the present utility model not only improves the internal cooling efficiency of the transformer, but also by canceling the cooling connecting pipe and the bus collecting main pipe, it will neither affect the heat dissipation effect, at the same time reduces the installation width of the transformer, widens the inspection passage, and further reduces the transformer consumables and oil consumption.
[0031] In the embodiment of the present utility model, the technical features not described in detail are all existing technologies or conventional technical means, and will not be elaborated here.
[0032] Finally, it should be noted that: the above embodiments are only specific embodiments of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that: any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.
Claims
1. 500kV transformer wall-mounted finned-tube cooling system, including finned-tube two (11) and a fan (2), the fan (2) is fixedly installed below the bottom of the finned-tube two (11), characterized in that, A plurality of upper finned tube connectors (12) and lower finned tube connectors (13) are respectively arranged at the top and bottom of the finned sheet (11). The lower finned tube connector (13) is of a horizontal straight tube structure, and the upper finned tube connector (12) is of a sunken bent structure. A plurality of oil tank connectors (6) respectively correspond to the plurality of upper finned tube connectors (12) and lower finned tube connectors (13). One end of each oil tank connector (6) is respectively communicated with the top of the side wall of the transformer oil tank and the bottom of the side wall of the transformer oil tank. The other end of the oil tank connector (6) is respectively communicated with the upper finned tube connector (12) and the lower finned tube connector (13) through a flange and a connecting flange; A plurality of vertical channel-shaped reinforcing irons (7) are arranged on the outer wall of the transformer oil tank, and a plurality of horizontal reinforcing irons (8) are welded on the outer wall of the transformer oil tank. The two ends of the reinforcing iron (8) are welded into one body with the adjacent channel-shaped reinforcing iron (7), or the two ends of the reinforcing iron (8) are welded into one body with the adjacent oil tank connector (6), or the two ends of the reinforcing iron (8) are welded into one body with the adjacent oil tank connector (6) and the channel-shaped reinforcing iron (7).
2. The wall-mounted fin cooling system for a 500 kV transformer according to claim 1, wherein It includes a formed angle ring (10), and the formed angle ring (10) is a cylindrical structure with a skirt on one end of its outer circumference. A plurality of through holes are evenly arranged on the skirt of the formed angle ring (10).
3. The wall-mounted fin cooling system for a 500 kV transformer according to claim 2, wherein A row of first round through holes are respectively arranged at the upper and lower parts of the side wall of the oil tank. The inner diameter of the first round through holes is larger than the outer diameter of the oil tank connector (6). A plurality of vertical magnetic shields (9) are located on the inner wall of the transformer oil tank. A second round through hole is opened at the middle position between the adjacent magnetic shields (9) corresponding to the first round through holes. The formed angle ring (10) is fixedly installed in the second round through hole. The outer diameter of the formed angle ring (10) fits the inner diameter of the second round through hole. A cloth belt passes through the through holes on the skirt of the formed angle ring (10) and is tied to the adjacent magnetic shield (9).
4. The wall-mounted fin cooling system for a 500 kV transformer according to claim 1, characterized in that, The oil tank connector (6) is made of a DN80 seamless steel pipe.
5. The wall-mounted fin cooling system for a 500 kV transformer according to claim 1, characterized in that, The channel-shaped reinforcing iron (7) is made of a 10 mm ordinary carbon steel plate and is of a dovetail structure. Hoisting brackets in an inverted pear shape are welded at the upper parts of the channel-shaped reinforcing irons (7) on both sides after drilling holes. Jack lifting platforms are arranged at the upper and lower parts of the channel-shaped reinforcing iron (7).