CN114843078A

CN114843078A - Traction transformer assembly

Info

Publication number: CN114843078A
Application number: CN202210606631.2A
Authority: CN
Inventors: 朱莉莉; 钟珩; 赵康发; 龙谷宗; 胡贵; 吴勇; 谭文俊; 陈日新; 王韬; 阳清泉; 熊涛; 邓凤祥; 吕春杰; 邓欣; 黄克旺; 孙喜明; 丁云风; 郑馨
Original assignee: CRRC Zhuzhou Electric Co Ltd
Current assignee: CRRC Zhuzhou Electric Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-08-02
Also published as: WO2023231222A1

Abstract

The application relates to the field of rail transit and electricity and discloses a traction transformer assembly, which comprises a bracket assembly, a traction transformer body, a cooler and a pipeline assembly, wherein the bracket assembly is provided with a bracket; 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 connected between the pair of cross beams in a suspension mode, the cooler is connected to one side of the traction transformer body, and the pipeline assembly is communicated with the traction transformer body and the cooler and used for driving cooling oil to circulate in the traction transformer body and the cooler. The traction transformer assembly is convenient to install and maintain, safe and reliable in operation and concise in arrangement.

Description

Traction transformer assembly

Technical Field

The application relates to the field of rail transit and electricity, in particular to a traction transformer assembly.

Background

The track traffic vehicle traction transformer is arranged on a train, converts high-voltage electricity of 25kV of a contact network into various low-voltage electricity required by a traction system and an auxiliary system, is a power transformer with a special voltage class, needs to meet the requirement of severe traction load change, and simultaneously needs to suppress harmonic current and limit short-circuit current, so that the safe, stable and reliable operation of an electric transmission system of the train is ensured, and the track traffic vehicle traction transformer is a power source of a track vehicle and is a core and a key component of the traction system.

The existing rail transit vehicle traction transformer usually adopts a cooling mode of forced ventilation of a cooling fan. The transformer has the advantages of higher noise, lower efficiency, driving power consumption of the fan, more maintenance work, special protection devices and control logics for the train, inconvenience in operation and maintenance and higher cost, and can monitor whether the cooling fan works normally when the train runs. And the traction transformer partially cooled by the cooler has the problem of inconvenient installation and maintenance.

Disclosure of Invention

The application aims at providing a traction transformer assembly which is convenient to install and maintain, safe and reliable in operation and concise in arrangement.

In order to achieve the above object, the present application provides a traction transformer assembly, including a bracket 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 connected between the pair of cross beams in a hanging mode, the cooler is connected to one side of the traction transformer body, and the pipeline assembly is communicated with the traction transformer body and the cooler and used for driving cooling oil to circulate in the traction transformer body and the cooler.

In some embodiments, the traction transformer body comprises an oil tank, a winding, an oil conservator, a high-voltage outgoing line and a low-voltage outgoing line, wherein the low-voltage outgoing line and the cooler are respectively arranged on a pair of side surfaces of the parallel longitudinal beams of the oil tank;

the side surfaces of the oil tank, which are parallel to the cross beam, are provided with mounting rib plates, the top ends of the mounting rib plates are connected with a mounting plate, and the oil tank is suspended on the cross beam through the mounting plate, a vibration damping pad and a bolt; the oil cooled by the cooler enters the built-in oil duct inside the oil tank after passing through the pipeline assembly, an oil outlet is formed in the upper portion of the built-in oil duct, and the cooled oil enters the winding of the traction transformer body through the oil outlet to cool the winding.

In some embodiments, the mounting webs on either side of the fuel tank extend obliquely towards the outside of the fuel tank, wherein,

the high-voltage outlet wire is arranged at the front side of the oil tank vertical to the travelling direction and is positioned in a gap in the middle of the mounting rib plate, the high-voltage outlet wire is connected with a high-voltage cable, the high-voltage cable enters the high-voltage wire passing groove after being fixed in the middle through a fixed point positioned below the cross beam,

the low-voltage outgoing lines are arranged on the side face of the oil tank parallel to the travelling direction, and the low-voltage cables are respectively led out from the front end and the rear end of the low-voltage outgoing lines, are fixed by the cross beams on the two sides and then enter the low-voltage wire passing grooves positioned above the sides.

In some embodiments, a vehicle underbody confinement is further included, the vehicle underbody confinement being wide at the top and narrow at the bottom, and at least one inner side of the vehicle underbody confinement being arcuate to fit the outer side of the cooler.

In some embodiments, the high-voltage wire passing grooves and the low-voltage wire passing grooves are symmetrically arranged above two sides of the vehicle bottom limit, and are parallel to the traveling direction.

In some embodiments, the cooler comprises a cooling pipe group, a base plate and an oil box assembly, the cooling pipe group is fixed on the base plate and is communicated with the oil box assembly through the base plate, and different butterfly valves are respectively arranged at an oil inlet and an oil outlet of the oil box assembly.

In some embodiments, the pipeline assembly further comprises an oil pump, the oil pump is used for driving cooling oil to circulate, the oil tank, the cooler and the oil pump are arranged, the oil path safety system is used for air bleeding, the oil path maintenance system is used for oil bleeding, and a first butterfly valve and a second butterfly valve are arranged at two ends of the oil pump respectively.

In some embodiments, the cooling tube group includes a plurality of rows of cooling tube bodies bent in a circular arc shape with a predetermined gap, the gap between any adjacent cooling tube bodies is gradually reduced from the inner periphery to the outer periphery, and the cooling tube group further includes a square tube disposed at the center of the cooling tube body at the inner periphery and connected to the base plate for turbulent flow.

In some embodiments, the oil box assembly comprises a first oil box, a second oil box and a third oil box, and the cooling pipe group comprises a first cooling pipe group arranged at the front end and communicated with the first oil box and the second oil box, and a second cooling pipe group arranged at the rear end and communicated with the second oil box and the third oil box; and the clearance between the first cooling tube group and the second cooling tube group is larger than the clearance between the cooling tube bodies of the first cooling tube group or the second cooling tube group.

In some embodiments, the protective cover is arranged at the periphery of the cooler and comprises grid ribs for protection, the grid ribs are staggered to form grid holes for air inlet, the thickness of the end parts, close to the air inlet side and the air outlet side, of the grid ribs is smaller, the thickness of the part, located between the air inlet side and the air outlet side, of the grid ribs is larger, and the size of the grid holes is increased from bottom to top.

The traction transformer assembly that this application provided adopts single cooler and traction transformer body integration, only needs to install the longeron of support assembly in the track traffic bottom along the driving direction, can conveniently hang traction transformer body and cooler wholly and fix on the crossbeam, has improved the convenience of installation and maintenance. The cooling oil is driven by the oil pump to exchange heat with the hot cooling oil through the pipeline assembly at the traction transformer body and the cooler by utilizing the running wind at the bottom of the vehicle, so that the cooling requirement of the traction transformer body is met.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of an installation of a traction transformer assembly provided in an embodiment of the present application;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is an angled assembly view of a cooler provided in accordance with embodiments of the present application;

FIG. 4 is an assembly view of another angle of a cooler provided by an embodiment of the present application;

FIG. 5 is a top view of FIG. 3;

FIG. 6 is a schematic view of a shield;

fig. 7 is a schematic view of the inside of the cooling tube body.

Wherein:

1-beam, 2-cooler mounting plate I, 3-second pipeline, 4-first air bleeder, 5-third pipeline, 6-cooler, 7-built-in oil duct, 8-cooler mounting plate II, 9-high-voltage cable, 10-front-end equipment, 11-high-voltage outlet line, 12-low-voltage cable, 13-low-voltage outlet line, 14-oil conservator, 15-first pipeline, 16-first butterfly valve, 17-second air bleeder, 18-oil pump, 19-second oil bleeder, 20-second butterfly valve, 21-rear-end equipment, 22-first oil bleeder, 23-mounting rib plate, 24-radiating fin, 25-winding, 26-protective cover, 27-vehicle bottom, 28-high-voltage wire-passing groove, 29-mounting plate, 30-damping pad, 31-oil tank, 32-low pressure wire passing groove, 33-cooling pipe group, 331-first cooling pipe group, 332-second cooling pipe group, 34-square pipe, 35-reinforcing plate, 36-base plate, 37-cooling pipe body, 371-reinforcing rib, 38-third oil discharging device, 39-first oil box, 40-third butterfly valve, 41-second oil box, 42-third oil box, 43-fourth butterfly valve and 44-third air discharging device.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In order to enable those skilled in the art to better understand the scheme of the present application, the present application will be described in further detail with reference to the accompanying drawings and the detailed description.

The embodiment of the application provides a traction transformer assembly, which comprises a bracket assembly, a traction transformer body, a cooler 6 and a pipeline assembly. Referring to fig. 1 and 2, the direction of the arrow in fig. 1 is the driving direction, in the embodiment of the present application, the cooler 6 is provided in a group and integrated on one side of the traction transformer body, and the two are integrally mounted on the cross beam 1 of the bracket assembly, so that the cooler 6 and the traction transformer body can be integrally disassembled and assembled, and the convenience of installation and maintenance is improved. The rack assembly comprises a pair of longitudinal beams and a pair of cross beams 1, wherein the longitudinal beams are used for being mounted to the bottom of the rail transit vehicle and are arranged in the center relative to the bottom limit 27 of the vehicle, the cross beams 1 are vertically connected between the longitudinal beams, namely the whole rack assembly is in a square shape, and the traction transformer is suspended between the cross beams 1 and keeps a set distance (generally more than 1 m) with the front-end equipment 10 and the rear-end equipment 21 after the installation.

In the above embodiment, the oil pump 18 is disposed in the pipeline assembly, the pipeline assembly is communicated with the traction transformer body and the cooler 6, the oil pump 18 is used to drive cooling oil to circulate between the traction transformer body and the cooler 6, and the hot cooling oil in the cooler 6 is subjected to heat exchange and temperature reduction by means of running wind. The traction transformer body comprises an oil tank 31, a winding 25, a high-voltage outgoing line 11, a low-voltage outgoing line 13 and an oil conservator 14, wherein the oil conservator 14 is arranged at the top of the oil tank 31, and of course, the oil conservator 14 can also be arranged on two sides of the oil tank 31 parallel to the cross beam 1. The oil conservator 24 is communicated with the transformer oil tank 22 through a pipeline, when the temperature in the transformer rises, the oil volume in the oil tank 22 expands and flows to the oil conservator 24, and when the temperature in the transformer falls, the oil volume in the oil tank 22 is reduced, and the oil in the oil conservator 24 flows into the oil tank 22 for compensation.

Cooler 6 passes through cooler mounting panel 2 and the second 8 of cooler mounting panel and fixes on the left side of oil tank 31, and cooler 6, mounting panel 29 and the equal perpendicular driving direction of the second 8 of cooler mounting panel bend to the front end and rear end respectively near cooler 6 side, and it has a plurality of mounting holes to bend the face for install cooler 6. The cooler mounting plate I2 and the cooler mounting plate II 8 are both provided with large square holes, so that the pipeline assembly can conveniently pass through the cooler 6.

The low-voltage outlet 13 is positioned on a group of opposite side surfaces, namely the right side surface, of the oil tank 31 and the cooler 6, the high-voltage outlet 11 is arranged on the front side surface in the driving direction shown in figure 1, the high-voltage wire passing groove 28 and the low-voltage wire passing groove 32 are both parallel to the driving direction and are symmetrically arranged on two sides of the bottom limit 27 of the vehicle, and the arrangement can separately route the low-voltage cables 12 and the high-voltage cables 9, so that the routing space is saved.

Four mounting rib plates 23 are arranged on the front side face and the rear side face in the driving direction, the four mounting rib plates 23 on each side are divided into two groups, the top ends of every two mounting rib plates 23 are fixedly connected with mounting plates 29, the two groups of mounting rib plates 23 on the front side face or the rear side face are respectively away from each other towards the outer side of an oil tank 31 and extend obliquely, high-pressure outlet wires 11 and fixing positions of an oil pump 18 are reserved in gaps between the oil tank 31 and the mounting rib plates 23, and meanwhile, mounting stress is balanced. The mounting plate 29 is provided with holes which can be suspended on the beam 1 through a damping pad 30 and bolts, so that the vibration caused by the magnetostriction of the iron core when the traction transformer body operates is isolated from being transmitted to the beam 1 and other parts of the vehicle.

The high-voltage outgoing line 11 is arranged on the front side of an oil tank 31 perpendicular to the travelling direction, the high-voltage outgoing line 11 is located in a gap in the middle of the mounting rib plate 23, the high-voltage outgoing line 11 is connected with a high-voltage cable 9, the high-voltage cable 9 enters the high-voltage wire passing groove 28 after being fixed in the middle through a fixed point located below the cross beam 1, the low-voltage outgoing line 13 is arranged on the side face of the oil tank 31 parallel to the travelling direction, and the low-voltage cables 12 are respectively outgoing from the front end and the rear end of the low-voltage outgoing line 13, fixed through the cross beams 1 on two sides and then enter the low-voltage wire passing groove 32 located above the side. Of course, the low voltage cable 12 may also be routed out of one end and into the low voltage wire trough 32.

In one embodiment, referring to fig. 2, a plurality of rows of heat dissipation fins 24 are disposed on the bottom of the traction transformer body, and the heat dissipation fins 24 penetrate through the entire bottom of the oil tank 31, so as to increase the heat dissipation area of the bottom. The radiating fins 24 can be arranged in an equidistant mode, and each row of rib plates are parallel to the traveling direction, so that the resistance of the traveling wind is reduced. The bottom of the radiating fin 24 does not exceed the vehicle bottom limit 27, and the high-flow-speed running wind at the bottom of the vehicle is fully utilized for radiating, so that the radiating capacity of the transformer is improved; of course, in the specific implementation, the heat dissipation fins 24 may also be disposed at unequal intervals, and the heat dissipation fins 24 may 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, which is not limited in this application.

The pipeline assembly comprises a first pipeline 15, a second pipeline 3, a third pipeline 5, a built-in oil duct 7, an oil path safety system and an oil path maintenance system, the first pipeline 15 is connected with the upper portion of an oil tank 31, hot oil on the upper portion of the oil tank 31 is pumped out through the first pipeline 15 by an oil pump 18 and is sent to a cooler 6 through the second pipeline 3, the oil cooled by the cooler 6 enters the built-in oil duct 7 in the oil tank 31 after passing through the third pipeline 5, an oil outlet is formed in the upper portion of the built-in oil duct 7, and the cooled oil enters the winding 25 of the transformer through the oil outlet to cool the winding 25. The oil circuit component simplifies the arrangement of the oil circuit, and the whole transformer is simple in structure and convenient to operate.

In one embodiment, the cooler 6 mainly includes a cooling tube set 33, a base plate 36 and an oil box assembly, the base plate 36 is provided with an opening, and the cooling tube set 33 is fixedly connected to the base plate 36 and is communicated 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., has three cavities. The cooling pipe group 33 comprises a plurality of rows of cooling pipe bodies 37 bent into an arc shape at preset gaps, the cooling pipe bodies 37 in each row are arranged in a coplanar manner, and the plane of the cooling pipe body 37 in each row is vertical to the travelling direction, so that the cooling pipe group forms a plurality of channels parallel to the travelling direction, and travelling wind can pass through the channels; of course, in specific implementation, the cooling tube bodies of each row may be arranged in a staggered manner, not in a plane, and the application does not limit this. The cooling tube group 33 is soldered to the substrate 36. A plurality of reinforcing plates 35 are arranged between the cooling pipe bodies 37, and the plurality of reinforcing plates 35 are parallel to the driving direction and are arranged in the direction perpendicular to the driving direction, so that the overall strength of the cooling pipe group 33 can be increased, and the generation of large vibration in the operation process is prevented. The center of the cooling tube group 33, that is, the center of the cooling tube body 37 on the inner periphery, is also provided with a square tube 34, the square tube 34 is fixedly connected to the substrate 36, the square tube 34 is used for disturbing flow and redistributing the flow field of the cooling tube group 33, the heat transfer effect of the cooling tube group 33 is increased, and the cooling power is increased.

The distance between the rows of cooling tube bodies 37 arranged in the traveling direction of the cooling tube bank 33 is set to be larger than the gaps between the other rows, so that when the train travels, the hot air inside the cooler 6 and the cold air outside the cooler are sufficiently exchanged and mixed in the middle of the cooling tube bank 33, which is favorable for improving the cooling power of the rear end cooling tube bank 33.

As shown in fig. 3 and 4, the cooling tube group 33 further includes a first cooling tube group 331 composed of a plurality of cooling tube bodies 37 at the front end in the traveling direction and a second cooling tube group 332 composed of a plurality of cooling tube bodies 37 at the rear end in the traveling direction, depending on the connections with the different oil sumps. The clearance between the first cooling tube group 331 and the second cooling tube group 332 is larger than the clearance between the first cooling tube group 331 or the second cooling tube group 332 and the cooling tube body 37, so that the wind resistance of the traveling wind entering the second cooling tube group 332 is reduced; of course, in practical implementation, the gap between the first cooling tube bank 231 and the second cooling tube bank 232 may also be equal to the gap between the first cooling tube bank 231 or the second cooling tube bank 232 and the cooling tube body 24, which is not limited in this application. The pipeline assembly transports the hot cooling oil from the oil tank 31 to the first oil box 39, the first oil box 39 is transported to the second oil box 41 through the first cooling pipe group 331 on the periphery, the second oil box 41 is uniformly mixed and then flows into the third oil box 42 through the second cooling pipe group 332, and the hot cooling oil is transported back to the oil tank 31 from the third oil box 42 and the pipeline assembly.

The cooling pipe body 37 may be a circular pipe, a flat pipe, an elliptical pipe, etc., and is not limited herein. The gaps between the cooling pipe bodies 37 are gradually reduced from the inner periphery to the outer periphery, that is, the gaps between the rows of the cooling pipe bodies 37 on the inner periphery are larger, so that when the train travels, the hot air inside the cooler 6 and the cold air outside the cooler are fully exchanged and mixed in the middle of the cooling pipe group 33, and the improvement of the cooling power of the rear-end cooling pipe group is facilitated. Of course, in practical implementation, the cooling tube bodies 37 may also be disposed at equal intervals, and the present application is not limited thereto.

The oil circuit safety system comprises a first air bleeder 4, a second air bleeder 17 and a third air bleeder 44, wherein the first air bleeder 4 is positioned at the top of the oil tank 31, the second air bleeder 17 is positioned at the top of the oil pump 18, and the third air bleeder 44 is positioned at the top of the cooler 6, so that the air in the oil tank 31, the air in the oil pump 18 and the air in the cooler 6 can be respectively discharged in time, and the air can not enter the winding 25 along with the cooling oil to circulate, thereby causing the operation failure of the transformer. The oil circuit maintenance system comprises a first butterfly valve 16, a second butterfly valve 20, a third butterfly valve 40, a fourth butterfly valve 43, a first oil discharging device 22, a second oil discharging device 19 and a third oil discharging device 38. The first butterfly valve 16 and the second butterfly valve 20 are arranged at two ends of the oil pump 18, and the third butterfly valve 40 and the fourth butterfly valve 43 are respectively arranged at an oil inlet and an oil outlet of the oil box assembly. The first oil discharging device 22 can be positioned at the bottom of the oil tank 31, the second oil discharging device 19 can be positioned at the bottom of the oil pump 18, and the third oil discharging device 38 can be positioned at the bottom of the cooler 6.

The oil way maintenance system and the oil way safety system can realize independent oil injection and exhaust of the oil tank 31, the oil pump 18 and the cooler 6, avoid the problem that the traction transformer assembly is integrally returned to a factory due to the fact that a single component needs to be refilled due to faults or other reasons, simplify the oil injection process for replacing the component through innovative design, realize field replacement, oil injection and exhaust on the vehicle, shorten the fault processing period and save a large amount of economic cost.

Each butterfly valve can realize opening and closing of each part of the oil circuit, when a certain part such as the oil pump 18 needs to be replaced independently, the first butterfly valve 16 and the second butterfly valve 20 on two sides of the oil pump 18 can be closed, oil outflow of other parts is prevented, and oil replacement amount and replacement work load are greatly reduced.

In an embodiment, referring to fig. 6, a grille-shaped protective cover 26 is disposed outside the cooler 6 to prevent foreign matters such as stones under the vehicle from hitting the cooler 6, folded edges are disposed around the protective cover 26, holes are formed in the folded edges, bolts pass through the holes to connect the protective cover 26 with the substrate 36, the protective cover 26 is formed by grille ribs arranged in a staggered manner, the depth directions of the grille holes located in front and at the back of the traveling direction are coincident with the traveling direction, the depth direction of the grille holes located in the middle of the grille holes is perpendicular to the traveling direction, the thickness of the grille ribs near the air inlet side and the air outlet side of the grille holes is relatively thin, the middle thickness is relatively large, and accordingly, the wind resistance of traveling wind entering the cooler 6 through the grille holes is reduced; in addition, the size of the grid holes is gradually increased from bottom to top, so that the wind resistance is reduced while the protection effect is improved. Illustratively, the grid ribs are staggered horizontally and vertically to form grid holes, the distance between the transversely arranged grid ribs can be gradually increased from bottom to top, and the vertically arranged grid ribs can be arranged at equal intervals. As shown in fig. 7, the cooling tube body 37 has a plurality of reinforcing ribs 371 inside, which disturb the oil flow while increasing the strength, increase the heat transfer effect, increase the heat dissipation area of the oil side, and improve the heat dissipation power, thereby being beneficial to the miniaturization and light-weight design of the transformer and the cooler 6.

The application provides a traction transformer assembly still includes vehicle bottom boundary limit 27, vehicle bottom boundary limit 27 is used for connecting the bottom at the carriage, the top of vehicle bottom boundary limit 27 is wide, the bottom is narrow, both sides face from top to bottom extends to carriage central authorities slope, both sides face all can set up to the arc, to the situation that sets up a cooler 6, one of them medial surface of vehicle bottom boundary limit 27 can be fully with the adaptation of laminating of cooler 6, when conveniently passing through the tunnel, balanced lateral part air current, reduce driving lateral part resistance, improve cooler 6's cooling efficiency, high pressure crosses line groove 28 and low pressure and crosses line groove 32 then the symmetry and set up the both sides at vehicle bottom boundary limit 27.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The traction transformer assembly provided by the present application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A traction transformer assembly is characterized by comprising a bracket 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 connected between the pair of cross beams in a suspension mode, the cooler is connected to one side of the traction transformer body, and the pipeline assembly is communicated with the traction transformer body and the cooler and used for driving cooling oil to circulate in the traction transformer body and the cooler.

2. The traction transformer assembly according to claim 1, wherein the traction transformer body comprises an oil tank, a winding, an oil conservator, a high-voltage outlet line and a low-voltage outlet line, and the low-voltage outlet line and the cooler are respectively arranged on a pair of side surfaces of the oil tank parallel to the longitudinal beam;

the side surfaces, parallel to the cross beam, of the oil tank are provided with mounting rib plates, the top ends of the mounting rib plates are connected with mounting plates, and the oil tank is suspended on the cross beam through the mounting plates, vibration damping pads and bolts; the oil cooled by the cooler enters the built-in oil duct in the oil tank after passing through the pipeline assembly, an oil outlet is formed in the upper portion of the built-in oil duct, and the cooled oil enters the winding of the traction transformer body through the oil outlet to cool the winding.

3. The traction transformer assembly according to claim 2, wherein the mounting rib plate of either side of the oil tank extends obliquely toward the outside of the oil tank,

the high-voltage outlet wire is arranged on the front side of the oil tank perpendicular to the driving direction and is arranged in a avoiding way with the mounting rib plate, the high-voltage outlet wire is connected with a high-voltage cable, the high-voltage cable enters the high-voltage wire passing groove after being fixed in the middle through a fixed point positioned below the cross beam,

the low-voltage outgoing lines are arranged on the side face of the oil tank parallel to the driving direction, and low-voltage cables are respectively led out from the front end and the rear end of the low-voltage outgoing lines, are fixed by the cross beams on the two sides and then enter the low-voltage wire passing grooves on the upper sides.

4. The traction transformer assembly according to claim 3, further comprising a vehicle underbody confinement that is wide at the top and narrow at the bottom, and at least one inner side of the vehicle underbody confinement is arcuate in shape that fits the outer side of the cooler.

5. The traction transformer assembly as claimed in claim 4, wherein the high voltage wire-passing grooves and the low voltage wire-passing grooves are symmetrically arranged above two sides of the vehicle bottom limit, and the high voltage wire-passing grooves and the low voltage wire-passing grooves are parallel to the traveling direction.

6. The traction transformer assembly according to claim 1, wherein the cooler comprises a cooling pipe set, a base plate and an oil box component, the cooling pipe set is fixed on the base plate and is communicated with the oil box component through the base plate, and an oil inlet and an oil outlet of the oil box component are respectively provided with different butterfly valves.

7. The traction transformer assembly according to claim 2, wherein the pipeline assembly further comprises an oil pump for driving cooling oil to circulate, an oil path safety system for air bleeding and an oil path maintenance system for oil bleeding, wherein the oil tank, the cooler and the oil pump are arranged, and a first butterfly valve and a second butterfly valve are respectively arranged at two ends of the oil pump.

8. The traction transformer assembly according to claim 6, wherein the cooling tube group comprises a plurality of rows of cooling tube bodies bent in an arc shape with a predetermined gap, the gap between any adjacent cooling tube bodies is tapered from an inner periphery to an outer periphery, and further comprises a square tube disposed at the center of the cooling tube body at the inner periphery and connected to the base plate for turbulence.

9. The traction transformer assembly according to claim 8, wherein the oil box component comprises a first oil box, a second oil box and a third oil box, and the cooling pipe set comprises a first cooling pipe set arranged at the front end and communicated with the first oil box and the second oil box, and a second cooling pipe set arranged at the rear end and communicated with the second oil box and the third oil box; and the clearance between the first cooling tube group and the second cooling tube group is larger than the clearance between the first cooling tube group or the second cooling tube group compared with the cooling tube body.

10. The traction transformer assembly as recited in claim 6, further comprising a protective cover disposed on the periphery of said cooler, said protective cover comprising grid ribs for protection, said grid ribs being staggered to form grid holes for air intake, the thickness of the end portions of said grid ribs near the air intake side and the air output side being smaller, the thickness of the grid ribs between the air intake side and the air output side being larger, and the size of said grid holes being increased from bottom to top.