Traction transformer assembly

Abstract

The application relates to the field of rail transit and electricity and discloses a traction transformer assembly, which comprises a support assembly, a traction transformer body, a cooler and a pipeline assembly; the support assembly comprises a pair of longitudinal beams and a pair of cross beams vertically connected between the pair of longitudinal beams; the traction transformer body is suspendedly connected between the pair of cross beams; the cooler is connected to one side of the traction transformer body; and the pipeline assembly is connected between the traction transformer body and the cooler and is used for driving the circulation of cooling oil in the traction transformer body and the cooler. The traction transformer assembly provided by the application is convenient to install and maintain, safe and reliable to operate and simple in arrangement.

Description

Technical Field

[0001] This application relates to the fields of rail transit and electrical engineering, and in particular to a traction transformer assembly. Background Technology

[0002] Traction transformers for rail transit vehicles are installed on the train to convert the 25kV high-voltage electricity from the overhead contact line into various low-voltage electricity required by the traction and auxiliary systems. They are a special voltage level power transformer that must meet the requirements of drastic changes in traction load, while suppressing harmonic currents and limiting short-circuit currents, thereby ensuring the safe, stable and reliable operation of the train's electric drive system. They are the power source of rail vehicles and the core and key component of the traction system.

[0003] Current rail transit vehicle traction transformers typically employ forced ventilation cooling via cooling fans. This type of transformer is noisy, inefficient, requires power to power the fans, involves significant maintenance, and necessitates dedicated protection devices and control logic on the train to monitor fan operation. This results in inconvenient and costly maintenance. Conversely, traction transformers that utilize coolers present challenges in installation and maintenance. Summary of the Invention

[0004] The purpose of this application is to provide a traction transformer assembly that is easy to install and maintain, safe and reliable in operation, and has a simple layout.

[0005] To achieve the above objectives, this application provides a traction transformer assembly, including a support assembly, a traction transformer body, a cooler, and a piping assembly; the support assembly includes a pair of longitudinal beams and a pair of crossbeams vertically connected between the pair of longitudinal beams, the traction transformer body is suspended between the pair of crossbeams, the cooler is connected to one side of the traction transformer body, and the piping assembly connects the traction transformer body and the cooler, and is used to drive the cooling oil to circulate in the traction transformer body and the cooler.

[0006] In some embodiments, the traction transformer body includes an oil tank, windings, an oil conservator, high-voltage output lines and low-voltage output lines, with the low-voltage output lines and coolers respectively located on a pair of sides of the parallel longitudinal beam of the oil tank.

[0007] The oil tank is equipped with mounting ribs on the sides parallel to the crossbeam. The top of the mounting ribs is connected to the mounting plate. The oil tank is suspended from the crossbeam by the mounting plate, vibration damping pads and bolts. After being cooled by the cooler, the oil enters the built-in oil passage inside the oil tank through the pipeline assembly. An oil outlet is provided above the built-in oil passage. The cooled oil enters the winding of the traction transformer body through the oil outlet to cool the winding.

[0008] In some embodiments, the mounting stiffeners on either side of the fuel tank extend obliquely outward toward the outside of the fuel tank, wherein...

[0009] The high-voltage outlet is located on the front side of the fuel tank, perpendicular to the direction of travel, and in the gap between the mounting ribs. The high-voltage outlet connects to the high-voltage cable, which is then fixed in the middle at a fixing point located under the crossbeam before entering the high-voltage cable tray.

[0010] The low-voltage outlet is located on the side of the fuel tank parallel to the direction of travel. The low-voltage cables exit from the front and rear ends of the low-voltage outlet, are fixed by the crossbeams on both sides, and then enter the low-voltage cable tray located on the upper side.

[0011] In some embodiments, the vehicle bottom clearance is also included, which is wider at the top and narrower at the bottom, and at least one inner side of the vehicle bottom clearance is an arc shape adapted to the outer side of the cooler.

[0012] In some embodiments, high-voltage cable trays and low-voltage cable trays are symmetrically arranged above both sides of the vehicle bottom boundary, and both the high-voltage cable trays and low-voltage cable trays are parallel to the driving direction.

[0013] In some embodiments, the cooler includes a cooling pipe assembly, a base plate, and an oil box assembly. The cooling pipe assembly is fixed to the base plate and connected to the oil box assembly through the base plate. The oil box assembly has different butterfly valves installed at its oil inlet and oil outlet.

[0014] In some embodiments, the piping assembly further includes an oil pump for driving the circulation of cooling oil, and also includes an oil circuit safety system for venting and an oil circuit maintenance system for draining oil, located in the oil tank, cooler and oil pump, with a first butterfly valve and a second butterfly valve respectively installed at both ends of the oil pump.

[0015] In some embodiments, the cooling tube assembly includes multiple rows of cooling tube bodies bent into an arc shape with a preset gap, the gap between any adjacent cooling tube bodies gradually narrowing from the inner circumference to the outer circumference, and also includes a square tube disposed at the center of the cooling tube body on the inner circumference, connecting to the substrate and used for turbulence.

[0016] In some embodiments, the oil box assembly includes a first oil box, a second oil box, and a third oil box, and the cooling pipe assembly includes a first cooling pipe assembly located at the front end and communicating with the first oil box and the second oil box, and a second cooling pipe assembly located at the rear end and communicating with the second oil box and the third oil box; and the gap between the first cooling pipe assembly and the second cooling pipe assembly is greater than the gap between the cooling pipe bodies of the first cooling pipe assembly or the second cooling pipe assembly.

[0017] In some embodiments, a protective cover is also provided on the outer periphery of the cooler. The protective cover includes grid ribs for protection. The grid ribs are interlaced to form grid holes for air intake. The ends of the grid ribs near the air intake side and the air outlet side are thinner, and the portion of the grid ribs between the air intake side and the air outlet side is thicker. The size of the grid holes is arranged to increase from bottom to top.

[0018] The traction transformer assembly provided in this application integrates a single cooler and the traction transformer body. By simply installing the longitudinal beam of the support assembly along the direction of travel at the bottom of the rail transit system, the traction transformer body and cooler can be easily suspended and fixed to the crossbeam, improving the convenience of installation and maintenance. Driven by an oil pump, the cooling oil exchanges heat with the traction transformer body through the pipeline assembly and the undercarriage airflow via the cooler, meeting the cooling requirements of the traction transformer body. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is an installation diagram of the traction transformer assembly provided in the embodiments of this application;

[0021] Figure 2 for Figure 1 Front view;

[0022] Figure 3 An assembly drawing of the cooler provided in an embodiment of this application from one angle;

[0023] Figure 4 This is an assembly view of the cooler provided in an embodiment of this application from another angle;

[0024] Figure 5 for Figure 3 Top view;

[0025] Figure 6 This is a schematic diagram of the protective shield;

[0026] Figure 7 This is a schematic diagram of the interior of the cooling pipe body.

[0027] in:

[0028] 1-Crossbeam, 2-Cooler mounting plate one, 3-Second pipeline, 4-First venting device, 5-Third pipeline, 6-Cooler, 7-Internal oil passage, 8-Cooler mounting plate two, 9-High-voltage cable, 10-Front-end equipment, 11-High-voltage outlet, 12-Low-voltage cable, 13-Low-voltage outlet, 14-Oil conservator, 15-First pipeline, 16-First butterfly valve, 17-Second venting device, 18-Oil pump, 19-Second oil drain device, 20-Second butterfly valve, 21-Rear-end equipment, 22-First oil drain device, 23-Mounting rib, 24-Heat dissipation 25-Winding, 26-Protective cover, 27-Vehicle bottom clearance, 28-High voltage cable tray, 29-Mounting plate, 30-Vibration damping pad, 31-Oil tank, 32-Low voltage cable tray, 33-Cooling pipe assembly, 331-First cooling pipe assembly, 332-Second cooling pipe assembly, 34-Square tube, 35-Reinforcing plate, 36-Base plate, 37-Cooling pipe body, 371-Reinforcing rib, 38-Third oil drain device, 39-First oil box, 40-Third butterfly valve, 41-Second oil box, 42-Third oil box, 43-Fourth butterfly valve, 44-Third venting device. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] This application provides a traction transformer assembly, including a bracket assembly, a traction transformer body, a cooler 6, and a piping assembly. (See reference...) Figure 1 and Figure 2 , Figure 1 The arrows in the diagram indicate the direction of travel. In this embodiment, a set of coolers 6 is integrated on one side of the traction transformer body. Both are mounted as a whole on the crossbeam 1 of the support assembly, allowing the coolers 6 and the traction transformer body to be disassembled and reassembled as a whole, improving the convenience of installation and maintenance. The support assembly includes a pair of longitudinal beams and a pair of crossbeams 1. The pair of longitudinal beams are installed to the bottom of the rail transit vehicle and are centered relative to the bottom clearance 27 of the vehicle. The pair of crossbeams 1 are vertically connected between the pair of longitudinal beams. That is, the entire support assembly is roughly U-shaped. The traction transformer is suspended between the pair of crossbeams 1 and maintains a set distance (usually more than 1m) from the front-end equipment 10 and the rear-end equipment 21 after installation.

[0032] In the above embodiment, an oil pump 18 is installed in the piping assembly, which connects the traction transformer body and the cooler 6. The oil pump 18 drives the cooling oil to circulate between the traction transformer body and the cooler 6, and the hot cooling oil in the cooler 6 is cooled by heat exchange with the help of the running air. The traction transformer body includes an oil tank 31, windings 25, high-voltage output lines 11, low-voltage output lines 13, and an oil conservator 14. The oil conservator 14 is located on top of the oil tank 31. Of course, the oil conservator 14 can also be arranged on both sides of the oil tank 31 parallel to the crossbeam 1. The oil conservator 24 and the transformer oil tank 22 are internally connected by a pipe. When the internal temperature of the transformer rises, the oil volume in the oil tank 22 expands and flows to the oil conservator 24. When the internal temperature of the transformer decreases, the oil volume in the oil tank 22 shrinks, and the oil in the oil conservator 24 flows into the oil tank 22 to compensate.

[0033] The cooler 6 is fixed to the left side of the fuel tank 31 by cooler mounting plate 29 and cooler mounting plate 8. The cooler 6, mounting plate 29, and cooler mounting plate 8 are all perpendicular to the driving direction and are bent towards the front and rear ends respectively near the side of the cooler 6. Multiple mounting holes are opened on the bent surfaces for installing the cooler 6. Both cooler mounting plate 29 and cooler mounting plate 8 have large square holes to facilitate the passage of pipe components and the installation of the cooler 6.

[0034] The low-pressure outlet 13 is located on the right side of the oil tank 31 and the cooler 6, while the high-pressure outlet 11 is located on... Figure 1 On the front side of the vehicle in the direction of travel, the high-voltage cable tray 28 and the low-voltage cable tray 32 are both parallel to the direction of travel and are symmetrically arranged on both sides of the bottom boundary 27 of the vehicle. This arrangement can separate the low-voltage cable 12 and the high-voltage cable 9 for routing, which helps to save routing space.

[0035] Four mounting ribs 23 are installed on both the front and rear sides in the direction of travel. The four mounting ribs 23 on each side are divided into two groups. The top of each pair of mounting ribs 23 is fixed to a mounting plate 29. The two groups of mounting ribs 23 on the front or rear sides extend away from each other and at an angle towards the outside of the oil tank 31. The gap between the oil tank 31 and the mounting ribs 23 is left to provide a fixing position for the high-voltage output line 11 and the oil pump 18, while also facilitating the balancing of installation stress. The openings in the mounting plate 29 can be used to suspend it on the crossbeam 1 through vibration damping pads 30 and bolts, isolating the vibration caused by the magnetostriction of the iron core during the operation of the traction transformer body from being transmitted to the crossbeam 1 and other parts of the vehicle.

[0036] The high-voltage outlet 11 is located on the front side of the fuel tank 31, perpendicular to the driving direction. The high-voltage outlet 11 is situated in the gap between the mounting ribs 23. The high-voltage outlet 11 connects to the high-voltage cable 9. The high-voltage cable 9 is intermediately fixed at a fixing point located under the crossbeam 1 and then enters the high-voltage cable tray 28. The low-voltage outlet 13 is located on the side of the fuel tank 31, parallel to the driving direction. Low-voltage cables 12 exit from the front and rear ends of the low-voltage outlet 13, are fixed by the crossbeams 1 on both sides, and then enter the low-voltage cable tray 32 located on the upper side. Alternatively, the low-voltage cable 12 can also exit from one end and enter the low-voltage cable tray 32.

[0037] In one embodiment, see Figure 2 The bottom of the traction transformer body is provided with multiple rows of heat dissipation fins 24, which extend through the entire bottom of the oil tank 31, increasing the bottom heat dissipation area. The heat dissipation fins 24 can be arranged at equal intervals, with each row of ribs parallel to the direction of travel to reduce the resistance of the airflow. The bottom of the heat dissipation fins 24 does not exceed the vehicle bottom clearance 27, making full use of the high-velocity airflow under the vehicle for heat dissipation and increasing the transformer's heat dissipation capacity. Of course, in specific implementations, the heat dissipation fins 24 can also be arranged at non-equal intervals. The heat dissipation fins 24 can be directly welded to the bottom of the oil tank 31, or welded to a heat dissipation plate and then connected to the bottom of the oil tank 31. This application does not impose any restrictions on this.

[0038] The piping assembly includes a first pipe 15, a second pipe 3, a third pipe 5, an internal oil passage 7, and an oil passage safety system and an oil passage maintenance system. The first pipe 15 is connected to the upper part of the oil tank 31. The oil pump 18 draws hot oil from the upper part of the oil tank 31 through the first pipe 15, and sends it to the cooler 6 through the second pipe 3. After being cooled by the cooler 6, the oil enters the internal oil passage 7 inside the oil tank 31 through the third pipe 5. An oil outlet is provided above the internal oil passage 7. The cooled oil enters the winding 25 of the transformer through the oil outlet to cool the winding 25. This oil circuit composition simplifies the oil circuit layout, making the entire transformer structure simple and easy to operate.

[0039] In one embodiment, the cooler 6 mainly includes a cooling pipe assembly 33, a base plate 36, and an oil box assembly. The base plate 36 has openings, and the cooling pipe assembly 33 is fixedly connected to the base plate 36 and communicates with the oil box assembly through the base plate 36. In this embodiment, the oil box assembly includes a first oil box 39, a second oil box 41, and a third oil box 42, i.e., it has three cavities. The cooling pipe assembly 33 includes multiple rows of cooling pipe bodies 37 bent into an arc shape with preset gaps. The cooling pipe bodies 37 in each row are coplanar, and the plane of each row of cooling pipe bodies 37 is perpendicular to the driving direction, so that the cooling pipe assembly forms multiple channels parallel to the driving direction, which is conducive to the passage of airflow through the channels; of course, in specific implementations, the cooling pipe bodies in each row can also be staggered and not in the same plane, and this application does not limit this. The cooling pipe assembly 33 is welded to the base plate 36. Multiple reinforcing plates 35 are provided between the cooling pipe bodies 37. These reinforcing plates 35 are parallel to the driving direction and arranged perpendicular to it. This increases the overall strength of the cooling pipe assembly 33 and prevents excessive vibration during operation. A square tube 34 is also provided in the center of the cooling pipe body 37, which is also the inner circumference of the cooling pipe assembly 33. The square tube 34 is fixed to the base plate 36. The square tube 34 is used to turbulent and redistribute the flow field of the cooling pipe assembly 33, thereby increasing the heat transfer effect and cooling power of the cooling pipe assembly 33.

[0040] A larger gap is set in the middle of the multiple rows of cooling pipe bodies 37 arranged in the direction of train travel, which allows for sufficient exchange and mixing of hot air inside the cooler 6 and cold air outside when the train is moving. This is beneficial to improving the cooling power of the rear cooling pipe group 33.

[0041] As attached Figure 3 and attached Figure 4 As shown, depending on the connection with different oil boxes, the cooling pipe assembly 33 also includes a first cooling pipe assembly 331 located at the front end in the driving direction and composed of several cooling pipe bodies 37, and a second cooling pipe assembly 332 located at the rear end in the driving direction and composed of several cooling pipe bodies 37. The gap between the first cooling pipe assembly 331 and the second cooling pipe assembly 332 is greater than the gap between the cooling pipe bodies 37 of the first cooling pipe assembly 331 or the second cooling pipe assembly 332, reducing the wind resistance of the traveling air entering the second cooling pipe assembly 332; of course, in specific implementations, the gap between the first cooling pipe assembly 231 and the second cooling pipe assembly 232 can also be equal to the gap between the first cooling pipe assembly 231 or the second cooling pipe assembly 232 and the cooling pipe body 24, and this application does not limit this. The pipeline assembly transports hot and cool oil from the oil tank 31 to the first oil box 39. The first oil box 39 then transports the oil to the second oil box 41 through the first cooling pipe group 331 on its outer periphery. After being evenly mixed in the second oil box 41, the oil flows into the third oil box 42 through the second cooling pipe group 332 and is then transported back to the oil tank 31 from the third oil box 42 and the pipeline assembly.

[0042] The cooling pipe body 37 can be round, flat, or elliptical, etc., and there is no limitation here. The gap between the cooling pipe bodies 37 gradually decreases from the inner circumference to the outer circumference, that is, the gap between rows of cooling pipe bodies 37 on the inner circumference is larger. This allows for sufficient exchange and mixing of hot air inside the cooler 6 and cold air outside the cool pipe group 33 during train operation, which is beneficial to improving the cooling power of the rear cooling pipe group. Of course, in specific implementations, the cooling pipe bodies 37 can also be arranged at equal intervals, and this application does not limit this.

[0043] The oil circuit safety system includes a first venting device 4, a second venting device 17, and a third venting device 44. The first venting device 4 is located on top of the oil tank 31, the second venting device 17 is located on top of the oil pump 18, and the third venting device 44 is located on top of the cooler 6. These devices can release gas from the oil tank 31, the oil pump 18, and the cooler 6 in a timely manner to prevent gas from circulating into the winding 25 with the cooling oil, thus causing transformer malfunctions. The oil circuit maintenance system includes a first butterfly valve 16, a second butterfly valve 20, a third butterfly valve 40, a fourth butterfly valve 43, a first oil drain device 22, a second oil drain device 19, and a third oil drain device 38. The first butterfly valve 16 and the second butterfly valve 20 are located at both ends of the oil pump 18, while the third butterfly valve 40 and the fourth butterfly valve 43 are located at the oil inlet and outlet of the oil box assembly, respectively. The first oil draining device 22 can be located at the bottom of the oil tank 31, the second oil draining device 19 is located at the bottom of the oil pump 18, and the third oil draining device 38 is located at the bottom of the cooler 6. The oil in each part can be drained using the above three oil draining devices. At the same time, the oil draining devices can be connected to the oil filling device. When connected to the oil filling device, the entire transformer or its parts can be filled with oil.

[0044] The aforementioned oil circuit maintenance system and oil circuit safety system can individually fill and bleed the oil tank 31, oil pump 18 and cooler 6, avoiding the need to return the entire traction transformer assembly to the factory due to a single component needing to be refilled due to failure or other reasons. Through innovative design, the oil filling process for replacing components is simplified, and replacement, oil filling and bleeding can be carried out on-site on the vehicle, shortening the fault handling cycle and saving a lot of economic costs.

[0045] Each butterfly valve can open and close different parts of the oil circuit. When a specific component, such as oil pump 18, needs to be replaced, the first butterfly valve 16 and the second butterfly valve 20 on both sides of oil pump 18 can be closed to prevent oil from flowing out of other parts, thus greatly reducing the amount of oil to be replaced and the workload of replacement work.

[0046] In one embodiment, reference Figure 6The cooler 6 is equipped with a grid-shaped protective cover 26 to prevent foreign objects such as stones from impacting the cooler 6. The protective cover 26 has folded edges around its perimeter, with holes in the folded edges. Bolts pass through these holes to connect the protective cover 26 to the base plate 36. The protective cover 26 has grid holes formed by staggered grid ribs. The depth direction of the grid holes located at the front and rear of the driving direction coincides with the driving direction, while the depth direction of the arc-shaped grid holes in the middle is perpendicular to the driving direction. The thickness of the grid ribs near the air inlet and outlet sides of the grid holes is relatively thin, while the thickness in the middle is relatively large, thereby reducing the wind resistance of the airflow passing through the grid holes into the cooler 6. In addition, the size of the grid holes gradually increases from bottom to top, improving the protective effect while reducing wind resistance. For example, the grid ribs are staggered horizontally and vertically to form grid holes. The spacing between the horizontally arranged grid ribs can gradually increase from bottom to top, while the vertically arranged grid ribs can be evenly spaced. Figure 7 As shown, the cooling pipe body 37 has multiple reinforcing ribs 371 inside, which increase strength, disturb the oil flow, increase heat transfer effect, increase the heat dissipation area on the oil side, and improve heat dissipation power, which is beneficial to the miniaturization and lightweight design of transformer and cooler 6.

[0047] The traction transformer assembly provided in this application also includes a vehicle bottom clearance 27, which is used to connect to the bottom of the car body. The vehicle bottom clearance 27 is wide at the top and narrow at the bottom, and its two sides extend sloping from the top and bottom towards the center of the car body. Both sides can be set to be arc-shaped. In the case of setting a cooler 6, one of the inner sides of the vehicle bottom clearance 27 can fully fit with the cooler 6, which facilitates passing through the tunnel, balances the side airflow, reduces the side resistance of the vehicle, and improves the cooling efficiency of the cooler 6. The high voltage cable tray 28 and the low voltage cable tray 32 are symmetrically arranged on both sides of the vehicle bottom clearance 27.

[0048] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0049] The traction transformer assembly provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A traction transformer assembly, characterized in that, The system includes a support assembly, a traction transformer body, a cooler, and a piping assembly. The support assembly includes a pair of longitudinal beams and a pair of crossbeams vertically connected between the longitudinal beams. The longitudinal beams are arranged along the direction of travel. The support assembly is generally U-shaped. The longitudinal beams are installed at the bottom of the rail transit vehicle and centered relative to the vehicle's bottom clearance. The traction transformer body is suspended between the pair of crossbeams and maintains a set distance from the front and rear equipment. The cooler is connected to one side of the traction transformer body and uses running air to exchange heat and cool the hot cooling oil located in the cooler. The piping assembly connects the traction transformer body and the cooler and is used to drive the cooling oil to circulate between the traction transformer body and the cooler. The traction transformer body includes an oil tank, a low-voltage output line and a high-voltage output line. The low-voltage output line and the cooler are respectively located on a pair of sides of the oil tank parallel to the longitudinal beam. Mounting ribs are provided on the sides of the fuel tank parallel to the crossbeam, and the mounting ribs on any side of the fuel tank extend inclined outwards towards the outside of the fuel tank. The high-voltage outlet is located on the front side of the fuel tank, perpendicular to the driving direction, and avoids the mounting ribs. The high-voltage outlet connects to a high-voltage cable. The high-voltage cable is fixed in the middle at a fixing point located below the crossbeam and then enters the high-voltage cable tray. The low-voltage outlet is located on the side of the fuel tank, parallel to the driving direction. The low-voltage cable exits from the front and rear ends of the low-voltage outlet and is fixed by the crossbeams on both sides before entering the low-voltage cable tray located on the upper side.

2. The traction transformer assembly according to claim 1, characterized in that, The traction transformer body also includes windings, an oil conservator, and high-voltage output lines. The oil conservator is located on top of the oil tank or arranged on both sides of the oil tank parallel to the crossbeam. The oil conservator and the oil tank are connected by a pipeline. When the internal temperature of the traction transformer body rises, the oil in the oil tank expands and flows to the oil conservator. When the internal temperature of the traction transformer body decreases, the oil in the oil tank shrinks, and the oil in the oil conservator flows into the oil tank for compensation.

3. The traction transformer assembly according to claim 2, characterized in that, The top of the mounting rib is connected to the mounting plate, and the oil tank is suspended from the crossbeam by the mounting plate, vibration damping pads and bolts.

4. The traction transformer assembly according to claim 3, characterized in that, After being cooled by the cooler, the oil enters the built-in oil passage inside the oil tank through the pipeline assembly. An oil outlet is provided above the built-in oil passage. The cooled oil enters the winding of the traction transformer body through the oil outlet to cool the winding.

5. The traction transformer assembly according to claim 1, characterized in that, The vehicle bottom clearance is wider at the top and narrower at the bottom, and at least one inner side of the vehicle bottom clearance is an arc shape adapted to the outer side of the cooler, which facilitates passage through tunnels, balances side airflow, reduces side resistance during driving, and improves the cooling efficiency of the cooler.

6. The traction transformer assembly according to claim 5, characterized in that, The high-voltage cable tray and the low-voltage cable tray are symmetrically arranged above both sides of the bottom clearance of the vehicle, and both the high-voltage cable tray and the low-voltage cable tray are parallel to the driving direction.

7. The traction transformer assembly according to claim 1, characterized in that, The cooler includes a cooling pipe assembly, a base plate, and an oil box assembly. The cooling pipe assembly is fixed to the base plate and connected to the oil box assembly through the base plate. The oil box assembly is equipped with different butterfly valves at its oil inlet and oil outlet.

8. The traction transformer assembly according to claim 1, characterized in that, It also includes a protective cover disposed on the outer periphery of the cooler. The protective cover includes grid ribs for protection. The grid ribs are interlaced to form grid holes for air intake. The ends of the grid ribs near the air intake and air outlet sides are thinner, while the parts of the grid ribs located between the air intake and air outlet sides are thicker. The size of the grid holes is arranged to increase from bottom to top.

9. The traction transformer assembly according to claim 2, characterized in that, The piping assembly also includes an oil pump for driving the circulation of cooling oil, and further includes an oil circuit safety system for venting air and an oil circuit maintenance system for draining oil, wherein a first butterfly valve and a second butterfly valve are respectively provided at both ends of the oil pump.

10. The traction transformer assembly according to claim 7, characterized in that, The cooling tube assembly includes multiple rows of cooling tube bodies bent into an arc shape with preset gaps. The gap between any adjacent cooling tube bodies gradually narrows from the inner circumference to the outer circumference. It also includes a square tube located at the center of the cooling tube body on the inner circumference, connected to the substrate and used for turbulence.

11. The traction transformer assembly according to claim 10, characterized in that, The oil box assembly includes a first oil box, a second oil box, and a third oil box. The cooling pipe group includes a first cooling pipe group located at the front end and connecting the first oil box and the second oil box, and a second cooling pipe group located at the rear end and connecting the second oil box and the third oil box. The gap between the first cooling pipe group and the second cooling pipe group is greater than the gap between the first cooling pipe group or the second cooling pipe group and the cooling pipe body.

12. The traction transformer assembly according to claim 9, characterized in that, The oil circuit safety system includes a first venting device, a second venting device, and a third venting device. The first venting device is located on the top of the oil tank, the second venting device is located on the top of the oil pump, and the third venting device is located on the top of the cooler. These devices are used to release the gas in the oil tank, the oil pump, and the cooler in a timely manner to prevent the gas from circulating in the winding along with the cooling oil.

13. The traction transformer assembly according to claim 9, characterized in that, The oil circuit maintenance system includes a first butterfly valve, a second butterfly valve, a third butterfly valve, a fourth butterfly valve, a first oil drain device, a second oil drain device, and a third oil drain device. The first butterfly valve and the second butterfly valve are located at both ends of the oil pump. The third butterfly valve and the fourth butterfly valve are respectively located at the oil inlet and oil outlet of the oil box assembly of the cooler. The first oil drain device is located at the bottom of the oil tank, the second oil drain device is located at the bottom of the oil pump, and the third oil drain device is located at the bottom of the cooler. The above three oil drain devices are used to drain the oil from each part. At the same time, the oil drain devices are connected to the oil injection device, which is used to inject oil into the transformer as a whole or its parts.

14. The traction transformer assembly according to claim 1, characterized in that, A fixed position for the high-voltage outlet and the oil pump is left in the gap between the oil tank and the mounting rib plate, with the high-voltage outlet located in the gap in the middle of the mounting rib plate.

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