220KV vehicle-mounted mobile transformer

Abstract

The utility model belongs to the field of power transmission and transformation equipment, and relates to a 220KV vehicle-mounted mobile transformer, a transport vehicle adopts a gooseneck type hydraulic axis vehicle, and a transformer adopts a self-coupling three-phase three-winding forced oil circulation air-cooling no-load voltage regulation high-impedance transformer; a high-voltage outgoing line structure is arranged at the tail end of the oil tank and comprises a high-pressure oil-SF6 sleeve inserted into the end of the oil tank, a medium-voltage outgoing line structure is arranged at the head end of the oil tank and comprises a medium-voltage oil-air sleeve communicated with the lower middle portion of the side wall of the oil tank, and a low-voltage outgoing line structure is arranged on the oil tank cover. The low-voltage outgoing line structure comprises a low-voltage oil-air sleeve and a low-voltage busbar, the oil tank is communicated with an air cooler installed at the position close to a vehicle head, the terminal box and the air cooling control cabinet are integrated into the control cabinet in a two-in-one mode, the control cabinet is installed between the air cooler and the vehicle head, and the transformer capsule oil conservator is located above an oil tank cover. The requirements for electrical parameters and physical connection of the transformer are met, and the three-phase three-winding 220kV vehicle-mounted mobile substation has feasibility.

Description

Technical Field

[0001] The utility model belongs to the technical field of power transmission and transformation equipment, and particularly relates to a 220KV vehicle-mounted mobile transformer. Background Art

[0002] The vehicle-mounted mobile substation is an effective emergency power supply equipment. It is a concentrated substation that organically integrates the primary and secondary electrical equipment and installs them on one or more axle vehicles. The vehicle-mounted mobile transformer is the core equipment of the vehicle-mounted mobile substation, and it is also the key to whether the planning scheme of the vehicle-mounted mobile substation can be realized. With the increase of the voltage level and capacity requirements of the transformer, the volume, weight and external insulation distance of the transformer also increase. This conflicts with the requirements of the vehicle-mounted mobile substation for flexibility and small footprint, thus greatly increasing the design difficulty of the vehicle-mounted mobile transformer. It is necessary to realize the function and layout of the transformer within a limited space, minimize the size and weight of the transformer, and enable the vehicle-mounted mobile substation to reach the power supply area quickly and safely.

[0003] After years of development, at present, the domestic vehicle-mounted mobile substations are mainly 35kV and 110kV, and there are no application examples of 220kV vehicle-mounted mobile substations and vehicle-mounted mobile transformers in China. With the rapid development of my country's economy, the demand for electricity continues to grow. However, the irregularity of changes in power demand, the damage to power facilities caused by natural disasters or human factors, and the necessary power outages during the construction and transformation of the power grid still affect the power supply reliability of users to a certain extent. We must find ways to deal with temporary emergency power supply needs such as substation overload and project construction. The larger capacity 220kV vehicle-mounted mobile transformer, due to its own size and weight factors, restricts the technical research and application of 220kV mobile substations in China. In view of the fact that there are no mature application cases for 220kV vehicle-mounted mobile substations in China, how to optimize the parameters, structure, and layout of 220kV vehicle-mounted mobile transformers has become an important technical problem that needs to be solved by technicians in this field. Utility Model Content

[0004] In response to the needs of temporary power supply and emergency power supply of the power grid, the utility model provides a 220kV vehicle-mounted mobile transformer with the characteristics of large capacity, compact structure, high energy efficiency, simple and fast transportation and installation. Through reasonable design, on the one hand, it solves the problem of 220kV high voltage, 110kV medium voltage and 37kV low voltage live parts exposed to the surrounding electrical insulation safety, and on the other hand, it solves the problem of overall transportation size and weight restrictions.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A 220KV vehicle-mounted mobile transformer comprises a transport vehicle and a transformer installed on the transport vehicle. The transport vehicle adopts a gooseneck hydraulic axis vehicle, and the transformer adopts an autocoupled three-phase three-winding forced oil circulation air-cooled no-load voltage-regulating high-impedance transformer; a high-voltage outlet structure is arranged at the rear end of the vehicle, and the high-voltage outlet structure comprises a high-voltage oil-SF6 bushing inserted into the end of the oil tank, and the high-voltage oil-SF6 bushing is connected to the high-voltage rotating bushing through a GIS connecting tube. The high-voltage coil adopts a right-winding and inverted structure, and the three-phase high-voltage lead is connected to the high-voltage oil-SF6 bushing; a medium-voltage outlet structure is arranged at the front end of the vehicle, and the medium-voltage outlet structure comprises a medium-pressure oil-air bushing connected to the middle and lower part of the oil tank side wall near the front of the vehicle, and the medium-pressure oil-air bushing three-phase Tilted in three dimensions, the three-phase medium-voltage lead is connected to the medium-pressure oil-air bushing, and the medium-pressure oil-air bushing is connected to the medium-voltage cable terminal installed near the front of the train through an overhead cable; a low-voltage outlet structure is arranged on the fuel tank cover, and the low-voltage outlet structure includes a low-pressure oil-air bushing and a zero-phase bushing inserted into the fuel tank, and the low-pressure oil-air bushing is connected to the low-voltage busbar installed above the fuel tank, and the head and tail of the three-phase low-voltage lead are connected to form a triangle wiring structure and connected to the low-pressure oil-air bushing; the fuel tank is connected to the air cooler installed near the front of the train; the terminal box and the air-cooled control cabinet are integrated into the control cabinet, the control cabinet is installed between the air cooler and the front of the train, and the transformer capsule oil storage cabinet is installed above the fuel tank cover.

[0007] Preferably, the three-phase high-voltage lead is led from the bottom of the oil tank to the end of the oil tank and connected to the high-pressure oil-SF6 bushing; the three-phase medium-voltage lead is led horizontally from the middle of the oil tank to the end of the oil tank close to the front of the vehicle, turns downward and is connected to the medium-pressure oil-air bushing.

[0008] Preferably, a low-voltage busbar support base is installed on the side wall of the oil tank, a low-voltage busbar support frame is installed on the low-voltage busbar support base, a low-voltage busbar support insulator is installed on the low-voltage busbar support frame, and the low-voltage bus is installed on the low-voltage busbar support insulator.

[0009] Preferably, the pressure nail type upper end positioning member includes: a mounting seat, a back nut, a pressure nail and a pressure nail washer, the mounting seat includes a first fixed plate and a second fixed plate of a flat plate structure arranged vertically and parallel, the height of the first fixed plate is greater than the height of the second fixed plate, the first fixed plate and the second fixed plate are welded into one piece through a horizontal support plate, and a reinforcing rib is welded between the horizontal support plate and the lower part of the first fixed plate. The first fixed plate is installed on the inner wall of the oil tank corresponding to the height of the side beams at both ends of the upper iron yoke, and the pressure nail is rotatably installed at the center position of the second fixed plate. The back nut is mounted on the pressure nail, and the back nut is located on the side of the second fixed plate away from the first fixed plate. The end of the pressure nail away from the second fixed plate is fixedly connected to the pressure nail washer, and the side beams at both ends of the upper iron yoke respectively abut against the adjacent ends of a pair of pressure nail type upper end positioning members.

[0010] Preferably, the transformer body includes a low-voltage coil, a medium-voltage coil and a high-voltage coil from the inside to the outside. The low-voltage coil and the medium-voltage coil are left-wound and upright structures. Large oil passages of 12mm to 14mm are arranged at the partition positions corresponding to the medium-voltage coil and the low-voltage coil, and special-shaped wedge-shaped pads are arranged at the corresponding coil S-bend transposition positions. The shape and size of the special-shaped wedge-shaped pads match the S-bend at the large oil passage position.

[0011] Preferably, the fuel tank adopts a barrel structure, and a protruding edge extending outward is integrally formed around the bottom of the fuel tank, and a U-shaped notch is reserved on the protruding edge. A number of anchor bolts are arranged around the upper surface of the transport vehicle, and the position and size of the U-shaped notch match the anchor bolts. A pressure plate is mounted on the anchor bolts above the protruding edge, and the width of the pressure plate is greater than the width of the U-shaped notch. A fixing nut is tightened at the upper end of the anchor bolt above the pressure plate, and a rubber shock-absorbing pad is laid between the bottom of the fuel tank and the transport vehicle.

[0012] Preferably, the GIS connecting tube fixing bracket is welded on the outer wall of the oil tank, the GIS connecting tube is installed on the GIS connecting tube fixing bracket, the rotating sleeve fixing support frame is welded on the upper surface of the transport vehicle, and the high-pressure rotating sleeve is installed above the rotating sleeve fixing support frame.

[0013] Preferably, the medium-voltage cable terminal support mounting seat of the horizontal telescopic structure is installed on the side of the chassis of the transport vehicle, the lower end of the overhead cable support insulator bracket is fixedly installed on the gooseneck position of the transport vehicle, and the overhead cable support insulator is fixedly installed on the upper end of the overhead cable support insulator bracket.

[0014] Preferably, the capsule oil storage cabinet is a long strip structure with flat rounded corners, an annular or skirt reinforcement iron is arranged on the outer periphery of the capsule oil storage cabinet, a plurality of air guide pipes are designed between the oil tank cover and the capsule oil storage cabinet, and a plurality of corrugated flexible connecting pipes are arranged on the cooling pipe between the air cooler and the oil tank.

[0015] Preferably, the transformer adopts an off-excitation voltage regulation structure, and the off-excitation voltage regulation switch adopts three single-phase drum-type structures and is placed between the three-phase body.

[0016] The utility model has the following advantages:

[0017] The 220kV vehicle-mounted mobile transformer provided by the utility model solves the electrical parameters and physical connection requirements of the 220kV transformer, making the production of a three-phase three-winding 220kV vehicle-mounted mobile substation feasible. The overall width, height and weight are much smaller than those of a conventional substation 120MVA / 220kV transformer. The conventional substation 120MVA / 220kV transformer has a total width of about 8.2 meters, a height of about 7.5 meters, and a total weight of about 195 tons, and cannot be transported as a whole. The 220kV vehicle-mounted mobile transformer provided by the utility model has a width of less than 3.2 meters, a height of less than 3.5 meters, and a weight of less than 125 tons. Therefore, the 220kV vehicle-mounted mobile transformer provided by the utility model can well adapt to the complex road conditions in most parts of my country. In addition, the 220kV high-voltage outlet method adopts the structural type of "oil-SF6 bushing" + "GIS connecting tube" + "rotating bushing", which is convenient for the rapid installation and operation of the transformer after it is transported to the site. The operation is simpler and more efficient, and it is safer for on-site operators. The internal body positioning and external accessories of the 220kV vehicle-mounted mobile transformer provided by the utility model are correspondingly strengthened, with better mechanical strength, and can better adapt to the long-term and frequent transportation characteristics of mobile substations. The cooling pipeline is equipped with a corrugated connecting pipe so that the bending force generated by the deformation of the transport vehicle body is released through the corrugated connecting pipe to protect the cooling pipeline. The vehicle-mounted mobile transformer is equipped with a thick rubber shock-absorbing pad at the connection between the bottom of the oil tank and the vehicle body, which can better avoid the impact of bumps during transportation and vibrations during operation on the transformer itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present utility model, the accompanying drawings used in the technical solution will be briefly introduced below.

[0019] Figure 1 This is a front view of the vehicle-mounted mobile transformer in operation according to an embodiment of the utility model;

[0020] Figure 2 A top view of the vehicle-mounted mobile transformer in operation according to an embodiment of the utility model;

[0021] Figure 3 This is a front view of the vehicle-mounted mobile transformer in the transportation state of the embodiment of the utility model;

[0022] Figure 4 A top view of a vehicle-mounted mobile transformer in a transport state according to an embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the main structure of a vehicle-mounted mobile transformer according to an embodiment of the utility model;

[0024] Figure 6This is a schematic structural diagram of a press-nail type upper end positioning member according to an embodiment of the utility model;

[0025] Figure 7 7a is a front view of the special-shaped wedge-shaped pad, and 7b is a top view;

[0026] Figure 8 8a is a schematic diagram of the electrical connection principle of the vehicle-mounted mobile transformer of the embodiment of the utility model, 8a is a schematic diagram of the high and medium voltage wiring principle, and 8b is a schematic diagram of the low voltage wiring principle;

[0027] In the figure, 1-transformer body, 2-transport vehicle, 3-high-voltage oil-SF6 bushing, 4-GIS connecting tube, 5-high-voltage rotating bushing, 6-medium-voltage oil-air bushing, 7-overhead cable, 8-overhead cable supporting insulator, 9-medium-voltage cable terminal, 10-low-voltage oil-air bushing, 11-zero-phase bushing, 12-capsule oil storage cabinet, 13-control cabinet, 14-rotating bushing fixing support frame, 15-GIS connecting tube fixing support, 16-cooling pipe, 17-corrugated flexible connecting pipe, 18-overhead cable supporting insulator support, 19 -Off-excitation voltage regulating switch, 20-air cooler, 21-iron core, 22-body, 23-lead, 24-oil tank, 25-pressure nail type upper end positioning piece, 26-medium voltage cable terminal support mounting seat, 27-oil inlet pipe, 28-oil return pipe, 29-pressure block type lower end positioning piece, 30-pressure nail washer, 31-air guide pipe, 32-low-voltage busbar support base, 33-low-voltage busbar support frame, 34-low-voltage busbar support insulator, 35-low-voltage busbar, 36-mounting seat, 37-back busbar, 38-pressure nail, 39-special-shaped wedge-shaped pad. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0029] like Figure 1-7 As shown, a 220KV vehicle-mounted mobile transformer comprises a transport vehicle 2 and a transformer fixedly mounted on the transport vehicle 2. The transformer comprises a transformer body 1 and a plurality of transformer accessories.

[0030] The transformer body 1 includes an oil tank 24, and an iron core 21, a body 22 and a lead 23 are fixedly installed inside the oil tank 24. The iron core 21 adopts a three-phase five-column structure to significantly reduce the overall height of the transformer. The three-phase five-column structure will not be selected in conventional transformers of the same type and capacity, which will cause the transformer to be "short, fat and long", which is not suitable for the conventional substation's requirements for minimizing the transformer footprint and unlimited height, but this is what the vehicle-mounted mobile transformer needs. Through calculation and comparison, it is determined that the utility model uses a small iron core diameter and a three-phase five-column structure. However, this will cause the core clamp web to be too narrow and too long, etc., which increases the difficulty of the core design. Therefore, the utility model aims at the problem that the upper and lower core clamp webs are too narrow and too long, which easily leads to deformation, simulates and analyzes the stress conditions, and takes measures such as overall thickening and local strengthening to ensure the overall strength of the core clamp.

[0031] Considering the frequent transportation of vehicle-mounted transformers, the side beams of the core are thicker than conventional designs. At the same time, an innovative pressure-nail upper end positioning piece 25 is designed to reduce the impact of the silicon steel sheet on the side beams at both ends of the iron yoke on the core during transportation and enhance the fixation of the entire internal core. The pressure-nail upper end positioning piece 25 works together with the original pressure-block lower end positioning piece 29 to firmly fix the core inside the transformer (i.e., the iron core 21 and the body 22) in the X, Y, and Z axis directions, thereby enhancing the anti-bumping and anti-vibration performance of the vehicle-mounted mobile transformer. The side beams at both ends of the upper iron yoke of the iron core 21 respectively abut against one end of the pressure-nail upper end positioning piece 25, and the other end of the pressure-nail upper end positioning piece 25 is fixedly connected to the upper part of the inner wall of the oil tank 24. The pressure nail type upper end positioning member 25 includes: a mounting seat 36, a back nut 37, a pressure nail 38 and a pressure nail washer 30. The mounting seat 36 includes a first fixed plate and a second fixed plate of a flat plate structure arranged vertically and parallel. The height of the first fixed plate is greater than the height of the second fixed plate. The first fixed plate and the second fixed plate are welded into one body through a horizontal support plate. Reinforcing ribs are welded between the horizontal support plate and the lower part of the first fixed plate. The mechanical strength of the mounting seat 36 is improved by the reinforcing ribs. The pressure nail 38 is rotatably installed at the center position of the second fixed plate. The back nut 37 is mounted on the position of the pressure nail 38 close to the outer side surface of the second fixed plate. The back nut 37 is located on the side of the second fixed plate away from the first fixed plate. The end of the pressure nail 38 away from the second fixed plate is fixedly connected to the pressure nail washer 30. Use M24 bolts to firmly install the first fixing plate of the mounting seat 36 onto the inner wall of the oil tank 24, and then rotate the pressure pin 38 to drive the pressure pin washer 30 to expand and contract horizontally to the left and right, squeeze the side beams at both ends of the iron yoke on the iron core 21, and rotate the back nut 37 and tighten it after squeezing to lock the pressure pin 38 so that the pressure pin 38 will no longer loosen. Because there will be manufacturing errors when the iron core 21 is in place inside the oil tank 24, there will be deviations in the distance between the left and right ends. The advantage of using the pressure pin type upper end positioning member 25 is that the pressure pin 38 and the pressure pin washer 30 can be expanded and contracted horizontally to the left and right to ensure that the iron core 21 is firmly squeezed according to actual conditions. The pressure block type lower end positioning member 29 is fixedly installed at both ends of the inner bottom of the oil tank 24 to limit and fix the side beams at both ends of the lower iron yoke.

[0032] The body 22 includes three parts from the inside to the outside: a low voltage coil LV, a medium voltage coil MV, and a high voltage coil HV (including a voltage regulating tapping section). Figure 5The vehicle-mounted mobile transformer body structure shown has a lead wire 23 leading to a 110kV medium-pressure oil-air bushing 6 at the left end, and a lead wire 23 leading to a 220kV high-pressure oil-SF6 bushing 3 at the right end. In order to realize the lead wire 23 leading to the 220kV high-pressure oil-SF6 bushing 3, the 110kV medium-pressure oil-air bushing 6 and the 37kV low-pressure oil-air bushing 10, the utility model designs the high-voltage coil HV into a right-winding, inverted structure, so that the coil outlet is arranged at the lower end, while the low-voltage coil LV and the medium-voltage coil MV are designed into a left-winding, upright structure, so that the tail of the high-voltage coil HV is directly crimped and connected to the head of the medium-voltage coil MV at the upper end, forming an electrical connection path, so that the internal structure is more simplified. The voltage-regulating tapping section is set on the high-voltage coil HV. In order to ensure the ampere-turn balance, the corresponding partition positions of the medium-voltage coil MV and the low-voltage coil LV are designed with large oil passages of 12mm~14mm. The special-shaped wedge-shaped pads 39 are innovatively designed at the S-bend transposition of the corresponding coils. The shape and size of the special-shaped wedge-shaped pads 39 match the S-bend at the position of the large oil passage. The special-shaped wedge-shaped pads 39 are made according to the overall shape of the S-bend at the position of the large oil passage to tighten the S-bend transposition line cake and fix it firmly, thereby improving the short-circuit resistance of the coil. The voltage-regulating tapping section is the voltage-regulating coil. The number of voltage-regulating coil sections of the no-load voltage-regulating transformer is relatively small, so the voltage-regulating coil is usually placed directly in the high-voltage coil line segment, which is called the voltage-regulating tapping section. Compared with designing a voltage-regulating coil separately, such a design can reduce the volume of the transformer.

[0033] Lead wire 23 is the key and design difficulty in the utility model. The design and assembly of lead wire 23 are limited by the narrow internal space formed by iron core 21, body 22 and oil tank 24. It is necessary to fully consider the insulation distance of each place, etc., and the design of lead wire 23 is relatively complicated. In the embodiment of the utility model, the design of lead wire 23 meets the requirements of vehicle-mounted mobile transformer in the following three aspects: 1. Electrical performance: Under the premise of minimizing the overall size of the transformer, sufficient electrical strength is guaranteed; for example, the high-voltage coil HV in the body 22 adopts an inverted structure, so that the three-phase high-voltage lead wire is led from the bottom position of the inner side of the transformer oil tank 24 to the end of the transformer oil tank 24, and connected to the 220kV high-voltage oil-SF6 bushing 3, and the lead wire outlet method of this path is innovatively designed. 2. Mechanical strength: It can withstand the bumps of transportation of vehicle-mounted mobile transformers, vibrations of long-term operation and the impact of short-circuit electric force; the clamping design of lead wire 23 has sufficient clamping force, strength and rigidity, the clamping spacing of the wire clamp is encrypted, and laminated paperboard or laminated wood materials are selected according to the voltage level and electric field strength of different parts. The insulating screw for fixing the wire clamp is made of high-strength glass screw, etc. 3. Temperature rise requirements: When the heat dissipation space of the vehicle-mounted mobile transformer is limited, the cable cross-section and the insulation thickness of the cable package are balanced to achieve the optimal combination of the cable occupying the internal volume of the transformer and the heat dissipation of the cable, and the temperature rise during long-term operation, the temperature rise during short circuit, and the local temperature rise of the high-current lead wire shall not exceed the specified limit.

[0034] The oil tank 24 adopts a barrel-type structure. Since the edge of the barrel-type oil tank is on the upper part of the transformer, the risk of oil seepage and leakage of the vehicle-mounted mobile transformer is reduced, and it is more suitable for the use characteristics of the vehicle-mounted mobile transformer that is frequently transported. The bottom of the oil tank 24 is integrally formed with a horizontal protruding edge extending outward, and a U-shaped notch is reserved on the protruding edge. The size of the U-shaped notch matches the anchor bolt and the pressure plate reserved on the upper surface of the transport vehicle 2. The lower end of the anchor bolt is fixedly welded to the upper surface of the transport vehicle 2, and the U-shaped notch reserved on the protruding edge just fits on the anchor bolt, and then a pressure plate is put on the anchor bolt. The width of the pressure plate is greater than the width of the U-shaped notch. The fixing nut is tightened on the upper end of the anchor bolt above the pressure plate to firmly fix the oil tank 24 on the transport vehicle 2. The protruding edge of the bottom of the oil tank 24 adopts a U-shaped notch structure, which is cut and formed by a CNC machine tool to ensure that the notch positioning size is accurate. At the same time, it can make the oil tank 24 have a certain installation margin in the X and Y axis directions to avoid the inconsistency with the anchor bolts welded on the transport vehicle 2, resulting in failure to install. A thickened rubber shock-absorbing pad is laid between the bottom of the oil tank 24 and the transport vehicle 2, which can better avoid the impact of bumps during transportation and vibrations during operation on the transformer itself, and reduce the overall noise.

[0035] A 220kV high-voltage outgoing line structure is arranged at the rear end of the transport vehicle 2. The 220kV high-voltage voltage level requires a relatively large external insulation distance. Considering the limitation of the transportation height of the vehicle-mounted transformer, the 220kV high-voltage outgoing line method adopts a structural type of 220kV high-voltage oil-SF6 bushing 3 connected to the GIS connecting tube 4, and the GIS connecting tube 4 is further connected to the 220kV high-voltage rotating bushing 5. The high-voltage coil HV in the body 22 adopts a right-winding and inverted structure, so that the three-phase high-voltage lead wire is led from the bottom of the oil tank 24 to the end of the transformer, and connected to the 220kV high-voltage oil-SF6 bushing 3. The lower end of the 220kV high-voltage oil-SF6 bushing 3 is inserted into the oil tank 24 to reduce the overall height. The 220kV high-voltage rotating bushing 5 rotates its own angle. When the vehicle-mounted transformer is transported, the 220kV high-voltage rotating bushing 5 is rotated and retracted to meet the requirements of the outer limit of transportation; when the power is transmitted and operated, the angle of the 220kV high-voltage rotating bushing 5 is rotated and pulled apart to meet the requirements of the external insulation distance. The structure of the 220kV high-voltage rotating bushing 5 is simpler and can ensure rapid installation and power transmission and commissioning. The GIS connecting tube 4 is supported by the GIS connecting tube fixing bracket 15. The GIS connecting tube fixing bracket 15 is welded on the outer wall of the oil tank 24, so that the 220kV high-voltage oil-SF6 bushing 3, the GIS connecting tube 4, the GIS connecting tube fixing bracket 15 and the oil tank 24 form a stable whole, ensuring the safety and reliability of the transformer during transportation and operation. The 220kV high-voltage rotating bushing 5 is supported by the rotating bushing fixing support frame 14. The rotating bushing fixing support frame 14 is welded on the upper surface of the transport vehicle 2, so that the rotating bushing fixing support frame 14 is firmly fixed to prevent the 220kV high-voltage rotating bushing 5 from being deformed by force during transportation and operation. The 220kV high-voltage rotating bushing 5 is an existing product, including an electric rotating tooling, which mainly includes a rotating chain, a motor, and a control unit. The rotating chain is put on the circumferential direction of the root rotating flange of the 220kV high-voltage rotating bushing 5, and then the motor is fixed on the root fixing flange of the 220kV high-voltage rotating bushing 5. The rotating chain is then hung on the motor gear, and then the motor is started forward, reverse, stopped, etc. through the control unit, so as to achieve the purpose of rotating the 220kV high-voltage rotating bushing 5 in any direction of 360°.

[0036] A 110kV medium voltage outgoing line structure is arranged at the front end of the transport vehicle 2. The 110kV medium voltage outgoing line mode uses a 110kV medium voltage oil-air bushing 6 to connect the overhead cable 7, and the overhead cable 7 is then connected to the 110kV medium voltage cable terminal 9. By adjusting the installation position of the air cooler 20, an installation space for the overhead cable support insulator 8 and the overhead cable support insulator bracket 18 is reserved at the gooseneck position of the transport vehicle 2. The lower end of the overhead cable support insulator bracket 18 is fixedly installed at the gooseneck position of the transport vehicle 2, and the overhead cable support insulator 8 is fixedly installed at the upper end of the overhead cable support insulator bracket 18. The 110kV medium-voltage cable terminal 9 is installed on the 110kV medium-voltage cable terminal support mounting seat 26. The 110kV medium-voltage cable terminal support mounting seat 26 is installed on the side of the chassis of the transport vehicle 2. The 110kV medium-voltage cable terminal support mounting seat 26 is designed to be a horizontal telescopic structure. When the transformer is transported, the 110kV medium-voltage cable terminal support mounting seat 26 is retracted to within the width range of the transport vehicle 2; when the transformer is powered on, the 110kV medium-voltage cable terminal support mounting seat 26 is pulled out from the chassis of the transport vehicle 2, and then the 110kV medium-voltage cable terminal 9 is installed to put the transformer into operation. The three-phase medium-voltage lead wire is led from the middle of the transformer oil tank 24 to the end of the transformer oil tank 24, and then led downward to the lower part of the wall of the end of the oil tank 24, and then connected to the 110kV medium-voltage oil-air bushing 6. The three phases of the 110kV medium-voltage oil-air bushing 6 are tilted in three dimensions to increase the external insulation distance, while ensuring that it is still within the width and height limits of the transport vehicle 2 after tilting, and ensuring that the 110kV medium-voltage oil-air bushing 6 and the air cooler 20 have sufficient external insulation safety distance to ensure the safety of on-site workers.

[0037] A 37kV low-voltage outgoing line structure is designed on the upper surface of the oil tank 24. The outgoing line mode of the 37kV low-voltage oil-air bushing 10 connected to the low-voltage busbar 35 is selected. The low-voltage busbar 35 is connected by the power supply site owner according to the actual power demand. A low-voltage busbar support base 32 is designed and installed on the side wall of the oil tank 24 for the future on-site installation of the low-voltage busbar 35. The low-voltage busbar support frame 33 is fixedly installed on the low-voltage busbar support base 32, the low-voltage busbar support insulator 34 is fixedly installed on the low-voltage busbar support frame 33, and the low-voltage busbar 35 is fixedly installed on the low-voltage busbar support insulator 34. The oil end of the 37kV low-voltage oil-air bushing 10 is directly inserted into the oil tank 24 from the oil tank 24 cover without a lifting seat to reduce the overall height of the transformer. At the same time, the oil end of the zero-phase bushing 11 is also directly inserted into the oil tank 24 from the oil tank 24 cover, and the overall structure is similar to the 37kV low-voltage oil-air bushing 10.

[0038] The air cooler 20 is arranged on the swan neck platform of the transport vehicle 2, and includes an oil pump, an oil flow relay, and a sub-control box. One end of the first cooling pipe 16 is connected to the upper part of the side wall of the oil tank 24, and the other end of the first cooling pipe 16 is connected to one end of the oil inlet pipe 27, and the other end of the oil inlet pipe 27 is connected to the air cooler 20. One end of the return oil pipe 28 is connected to the air cooler 20, and the other end of the return oil pipe 28 is connected to one end of the second cooling pipe 16, and the other end of the second cooling pipe 16 is connected to the lower part of the tank wall of the oil tank 24 near the 110kV medium-pressure oil-air casing 6. The first cooling pipe 16 draws hot oil from the upper part of the side wall of the oil tank 24, and guides the hot oil to the air cooler 20 through the oil inlet pipe 27, and the cold oil is guided to the lower part of the tank wall of the oil tank 24 through the return oil pipe 28 and the second cooling pipe 16, and flows back to the inside of the oil tank 24. In order to prevent the swan neck part of the transport vehicle 2 from being bent and deformed due to the bumps during transportation, which may cause the cooling pipe 16, the oil inlet pipe 27 and the oil return pipe 28 to be deformed and leak oil, necessary supports and corrugated flexible connecting pipes 17 are added to each section of the cooling pipe 16. At the same time, corrugated flexible connecting pipes 17 are set at the connection between the cooling pipe 16 and the oil inlet pipe 27 and the oil return pipe 28, so that the force can be released through the corrugated flexible connecting pipes 17 to protect the safety of each section of the cooling pipe 16 and the air cooler 20.

[0039] The control cabinet 13 integrates the functions of the terminal box and the air-cooled control cabinet, and adopts a two-in-one type to reduce the floor space. The control cabinet 13 is arranged at the corner of the swan neck platform of the transport vehicle 2 to be away from the live parts of the overhead cable 7 and the 110kV medium-voltage cable terminal 9 to ensure the safety of the on-site operators. At the same time, a retractable ladder is designed between the transport vehicle 2 and the ground to facilitate on-site operators to go up and down and inspect and operate the control cabinet 13. All the non-electrical protection and air-cooled control secondary cables of the transformer body 1 are introduced into the control cabinet 13 through the stainless steel bridge installed on the upper surface of the transport vehicle. All external cables of the control cabinet 13 adopt the cable plug-in terminal structure to reduce the cumbersome secondary wiring on site and achieve the purpose of fast and flexible power supply of the vehicle-mounted substation.

[0040] The capsule oil conservator 12 is arranged above the cover of the oil tank 24. In order to reduce the overall height of the transformer, the capsule oil conservator 12 is designed as a long strip with flat rounded corners. In order to make up for the strength of the long strip with flat rounded corners, ring-shaped and skirt-shaped reinforcement irons are designed on the periphery of the capsule oil conservator 12 to ensure that the normal vacuum and pressure strength requirements are met. At the same time, the capsule oil conservator 12 has a low-profile design for the legs to further reduce the overall height. Multiple gas guide pipes 31 are designed between the cover of the oil tank 24 and the capsule oil conservator 12 to ensure that the gas inside the transformer can be normally introduced into the gas relay and the capsule oil conservator 12.

[0041] The utility model transformer adopts the off-excitation voltage regulation mode, designs the off-excitation voltage regulating switch 19, selects three single-phase drum-type structures, and places them between the three-phase bodies to reduce the size of the transformer. The voltage level and insulation level of the off-excitation voltage regulating switch 19 fully consider the influence of the voltage regulating tapping section on the position of the high-voltage coil HV, and keep the electrical performance of the switch consistent with the coil matching. In addition, the height direction installation position of the off-excitation voltage regulating switch 19 considers the influence of the inversion of the high-voltage coil HV, and is designed at a reasonable height position to control the electrical insulation distance and facilitate the connection of the tapping lead.

[0042] Transport vehicle 2 uses a gooseneck hydraulic axle vehicle, which is produced by a professional vehicle company to meet the transportation needs of 125t transformers and the long-term pressure bearing requirements of transformers. The axle vehicle weighs about 40t, and after the transformer is assembled, the total weight is about 165t. The gooseneck hydraulic axle vehicle is matched with the transformer. Dozens of large-sized anchor bolts are reserved on the upper surface of the axle vehicle. The bottom of the transformer box is firmly fixed with a pressure plate and a fixing nut to ensure that the transformer does not move in the three-dimensional direction, which meets the needs of frequent movement of vehicle-mounted mobile transformers. During transportation, the tractor head is used for traction transportation. After the transformer is assembled, the height of the vehicle is controlled below 4.5m, the transportation speed is required to be 40km / h or less, the minimum width of the open road is the vehicle width + 1m, the inclination (longitudinal slope / transverse slope) is 15° / 3°, the maximum outer turning radius of the vehicle turning radius is controlled within 30m, and the hydraulic axle vehicle is hydraulically controlled steering, and the inner / outer turning radius is about 9m / 12m. The width, length and turning radius of the axle vehicle meet the requirements of domestic road transportation.

[0043] like Figure 8 As shown, the vehicle-mounted mobile transformer adopts an autotransformer, and the calculated capacity of the autotransformer is less than the rated capacity. Therefore, under the same rated capacity, the main dimensions of the autotransformer are smaller, and the effective materials (silicon steel sheets and wires) and structural materials (steel) are reduced accordingly, thereby reducing the size and weight of the transformer. The reduction of effective materials also reduces copper loss and iron loss accordingly, so the efficiency of the autotransformer is higher. At the same time, due to the reduction of the main dimensions and the reduction of mass, a single transformer with a larger capacity can be manufactured under allowable transportation conditions, so the autotransformer type is more suitable for the vehicle-mounted mobile transformer of the utility model. Figure 8 In a, as described in the previous structure introduction, the high-voltage coil is inverted, and the high-voltage coil heads A, B, and C are led out from the bottom. After the tail of the high-voltage coil is connected to the upper part of the common coil, the tap is led out to form the medium-voltage coil heads Am, Bm, and Cm. After the lower part of the common coil is led out, it serves as the neutral point X to form an autocoupler star connection YNa0. Figure 8 In b, the heads of the three-phase low-voltage coils are a, b, and c, and the tails of the three-phase low-voltage coils are x, y, and z. After the heads and tails of the three-phase low-voltage coils are connected, a triangle d11 wiring method is formed. Figure 8 The circled part in b is connected to the low-pressure oil-air bushing 10. Finally, the YNa0d11 connection mode required by the vehicle-mounted mobile transformer is formed.

[0044] The 220kV vehicle-mounted mobile transformer provided by the embodiment of the utility model controls the external dimensions and weight of the transformer so as not to exceed the width, length and weight limits of the transport vehicle 2, and finally installs the transformer on a gooseneck hydraulic axle vehicle, ensuring that the final assembly does not exceed the limit of road transportation.

[0045] In the embodiments of the utility model, the technical features not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0046] Finally, it should be noted that the above embodiments are only specific implementation methods of the present utility model, which are used to illustrate the technical solution of the present utility model, rather than to limit it, and the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solution recorded in the above embodiments within the technical scope disclosed by the present utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the present utility model, and should be covered within the protection scope of the present utility model.

Claims

1. 220KV vehicle-mounted mobile transformer, including a transport vehicle and a transformer mounted on the transport vehicle, characterized in that: The transport vehicle adopts a gooseneck hydraulic axis vehicle, and the transformer adopts an autocoupled three-phase three-winding forced oil circulation air-cooled no-load voltage-regulating high-impedance transformer; a high-voltage outlet structure is arranged at the rear end of the vehicle, and the high-voltage outlet structure includes a high-voltage oil-SF6 bushing inserted into the end of the oil tank, and the high-voltage oil-SF6 bushing is connected to the high-voltage rotating bushing through a GIS connecting tube. The high-voltage coil adopts a right-winding and inverted structure, and the three-phase high-voltage lead is connected to the high-voltage oil-SF6 bushing; a medium-voltage outlet structure is arranged at the front end of the vehicle, and the medium-voltage outlet structure includes a medium-pressure oil-air bushing connected to the middle and lower part of the oil tank side wall near the front of the vehicle, and the three phases of the medium-pressure oil-air bushing are inclined in a three-dimensional direction, and the three-phase medium-voltage lead is connected To the medium-pressure oil-air bushing, the medium-pressure oil-air bushing is connected to the medium-voltage cable terminal installed near the front of the train through an overhead cable; a low-voltage outlet structure is arranged on the tank cover, and the low-voltage outlet structure includes a low-pressure oil-air bushing and a zero-phase bushing inserted into the tank, the low-pressure oil-air bushing is connected to the low-voltage busbar installed above the tank, and the head and tail of the three-phase low-voltage lead are connected to form a triangle wiring structure and connected to the low-pressure oil-air bushing; the tank is connected to the air cooler installed near the front of the train; the terminal box and the air-cooled control cabinet are integrated into the control cabinet, the control cabinet is installed between the air cooler and the front of the train, and the transformer capsule oil storage cabinet is installed above the tank cover.

2. The 220KV vehicle-mounted mobile transformer according to claim 1 is characterized in that: The three-phase high-voltage lead is led from the bottom of the fuel tank to the end of the fuel tank and connected to the high-pressure oil-SF6 bushing; the three-phase medium-voltage lead is led horizontally from the middle of the fuel tank to the end of the fuel tank close to the front of the vehicle, turns downward and is connected to the medium-pressure oil-air bushing.

3. The 220KV vehicle-mounted mobile transformer according to claim 2 is characterized in that: A low-voltage busbar support base is installed on the side wall of the oil tank, a low-voltage busbar support frame is installed on the low-voltage busbar support base, a low-voltage busbar support insulator is installed on the low-voltage busbar support frame, and a low-voltage busbar is installed on the low-voltage busbar support insulator.

4. The 220KV vehicle-mounted mobile transformer according to claim 2 is characterized in that: The pressure nail type upper end positioning piece includes: a mounting seat, a back nut, a pressure nail and a pressure nail washer. The mounting seat includes a first fixed plate and a second fixed plate of a flat plate structure arranged vertically and parallel. The height of the first fixed plate is greater than the height of the second fixed plate. The first fixed plate and the second fixed plate are welded into one piece through a horizontal support plate. Reinforcing ribs are welded between the horizontal support plate and the lower part of the first fixed plate. The first fixed plate is installed on the inner wall of the oil tank that is adapted to the height of the side beams at both ends of the upper iron yoke. The pressure nail is rotatably installed at the center position of the second fixed plate. The back nut is mounted on the pressure nail, and the back nut is located on the side of the second fixed plate away from the first fixed plate. The end of the pressure nail away from the second fixed plate is fixedly connected to the pressure nail washer, and the side beams at both ends of the upper iron yoke respectively abut against the adjacent ends of a pair of pressure nail type upper end positioning pieces.

5. The 220KV vehicle-mounted mobile transformer according to claim 2 is characterized in that: The body of the transformer includes low-voltage coils, medium-voltage coils and high-voltage coils from the inside to the outside. The low-voltage coils and medium-voltage coils are left-wound and upright structures. Large oil channels of 12mm~14mm are set at the corresponding partition positions of the medium-voltage coils and low-voltage coils, and special-shaped wedge-shaped pads are set at the corresponding coil S-bend transposition positions. The shape and size of the special-shaped wedge-shaped pads are matched with the S-bend at the large oil channel position.

6. The 220KV vehicle-mounted mobile transformer according to claim 1, characterized in that: The fuel tank adopts a barrel structure, and a protruding edge extending outward is integrally formed around the bottom of the fuel tank, and a U-shaped notch is reserved on the protruding edge. A number of anchor bolts are arranged around the upper surface of the transport vehicle, and the position and size of the U-shaped notch match the anchor bolts. A pressure plate is mounted on the anchor bolts above the protruding edge, and the width of the pressure plate is greater than the width of the U-shaped notch. The fixing nut is tightened at the upper end of the anchor bolt above the pressure plate, and a rubber shock-absorbing pad is laid between the bottom of the fuel tank and the transport vehicle.

7. The 220KV vehicle-mounted mobile transformer according to claim 1, characterized in that: The GIS connecting tube fixing bracket is welded on the outer wall of the oil tank, the GIS connecting tube is installed on the GIS connecting tube fixing bracket, the rotating sleeve fixing support frame is welded on the upper surface of the transport vehicle, and the high-pressure rotating sleeve is installed above the rotating sleeve fixing support frame.

8. The 220KV vehicle-mounted mobile transformer according to claim 1, characterized in that: The medium-voltage cable terminal support mounting seat of the horizontal telescopic structure is installed on the side of the chassis of the transport vehicle, the lower end of the overhead cable support insulator bracket is fixedly installed on the gooseneck position of the transport vehicle, and the overhead cable support insulator is fixedly installed on the upper end of the overhead cable support insulator bracket.

9. The 220KV vehicle-mounted mobile transformer according to claim 2, characterized in that: The capsule oil conservator is a long strip structure with flat rounded corners. An annular or skirt reinforcement iron is arranged on the outer periphery of the capsule oil conservator. Several air guide pipes are designed between the oil tank cover and the capsule oil conservator. Several corrugated flexible connecting pipes are arranged on the cooling pipe between the air cooler and the oil tank.

10. The 220KV vehicle-mounted mobile transformer according to any one of claims 1 to 9, characterized in that: The transformer adopts an off-excitation voltage regulation structure, and the off-excitation voltage regulating switch adopts three single-phase drum-type structures and is placed between the three-phase body.

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