AT power supply single-phase three-column five-winding traction transformer

Abstract

The utility model relates to transformer technical field, and disclose a kind of AT power supply single-phase three-column five-winding traction transformer, comprising: base, box, access door plate, clamping seat and bearing plate;The box fixed mounting is at the top of base, and the access door plate swing connection is at the front end of box.The utility model is through the cooperation of main column, first side column, second side column, first winding to fifth winding, can after external high-voltage electric energy input, utilize single-phase three-column core structure, avoid magnetic saturation by magnetic flux shunting, significantly reduce volume, reduce land occupation and reduce cost;With the winding distribution adjustment realization 330kV and below voltage accurate voltage regulation, adapt to high-speed electrified railway AT power supply demand, reduce iron loss to meet the requirement of energy saving and consumption reduction simultaneously;By winding cross winding meet specific impedance voltage requirement, cooperate current balance and safety grounding design, finally realize electric energy efficient conversion and stable delivery, comprehensively guarantee traction power supply safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically an AT-powered single-phase three-column five-winding traction transformer. Background Technology

[0002] Single-phase traction transformers are the core power supply equipment of railway electric traction systems. Their main function is to convert high-voltage grid voltage into low-voltage electrical energy suitable for train use. Essentially, they are special-purpose single-phase transformers designed to provide stable and safe power to rail transit vehicles such as electric locomotives and EMUs. Their core role is to solve the voltage matching problem between high-voltage transmission and low-voltage power consumption, and to achieve efficient power transmission.

[0003] An existing patent (publication number: CN211404223U) discloses a traction transformer. When the traction transformer body is subjected to vibration, the traction transformer body drives two horizontal plates to move up and down slightly. The two horizontal plates drive the corresponding vertical rods and sliding plates to slide. The two first springs elastically deform to generate elastic force, which changes the air pressure in the sealed space formed by the sliding plate and the corresponding sliding groove. Thus, the elastic force generated by the two first springs and the change in air pressure in the two sealed spaces are used to buffer part of the vibration force on the traction transformer body.

[0004] To address the aforementioned issues, while existing patents offer solutions that can provide a buffering effect through the cooperation of components such as cross plates, in practical applications, single-phase traction transformers typically employ a single-phase two-column core structure. This type of transformer is large in size, has high material costs, and occupies a large area, failing to meet current users' needs for energy conservation and consumption reduction. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Given the problems existing in the above-mentioned prior art, namely that single-phase traction transformers usually adopt a single-phase two-column core structure, transformers with this structure are large in size, have high material costs, and occupy a large area, which cannot meet the current users' needs for energy conservation and consumption reduction.

[0007] To achieve the above objectives, this utility model provides the following technical solution: An AT-powered single-phase three-column five-winding traction transformer includes: a base, a housing, a maintenance door panel, a mounting bracket, and a support plate; the housing is fixedly installed on the top of the base, the maintenance door panel is movably connected to the front end of the housing, the mounting bracket is fixedly installed on the inner wall of the housing, and the support plate is slidably connected to the top of the mounting bracket; the transformer also includes: A winding mechanism and a docking mechanism; the winding mechanism is located above the support plate, and the docking mechanism is located inside the snap-fit ​​seat.

[0008] As a further embodiment of this utility model: the winding mechanism includes: a main column, a first side column, a second side column, a first winding, a second winding, a third winding, a fourth winding, and a fifth winding. The main column is fixedly installed on the outer wall of the bearing plate, and the first side column is fixedly installed on another bearing plate. The second side column is fixedly installed on the top of the bearing plate on one side of the main column.

[0009] As a further embodiment of this utility model: the outer wall of the main column is composed of a first winding, a second winding, a third winding, a fourth winding, and a fifth winding in the form of concentric windings from the inside to the outside, and the fourth winding and the fifth winding are each composed of upper and lower parts.

[0010] As a further embodiment of this utility model: the upper end of the fourth winding is connected to the upper part of the fifth winding, and the lower beginning of the fourth winding is connected to the upper part of the fifth winding, and the upper and lower parts of the fifth winding are connected in series.

[0011] As a further embodiment of this utility model: the first end of the first winding is led out as the output terminal T on the power supply side of the transformer, and the end of the second winding is led out as the output terminal F on the power feed side of the transformer.

[0012] As a further embodiment of this invention: the end T1' of the first winding and the end T2' of the third winding are connected, and the beginning of the third winding and the beginning of the second winding are directly led out as grounding terminals N.

[0013] As a further embodiment of this utility model: the first end H1 of the fourth winding is directly led out as phase A of the transformer input terminal, and the last end H2' of the fourth winding is directly led out as phase B of the transformer input terminal.

[0014] As a further embodiment of this utility model: the docking mechanism includes: a sliding groove, a slot, a locking block, a placement groove, a flipping block, a connecting shaft, a filling cavity, a through rod, a rotating block, a limiting block, and a locking block. The sliding groove is formed on the outer wall of the locking seat, and the inner wall of the sliding groove is provided with a slot. The locking block is slidably connected inside the slot.

[0015] As a further embodiment of this utility model: the top of the bearing plate is provided with a mounting groove, and a flipping block is rotatably connected inside the mounting groove. A connecting shaft is fixedly installed on the outer wall of the flipping block. A filling cavity is provided inside the flipping block, and a through rod extends out of the filling cavity.

[0016] As a further embodiment of this utility model: a rotating block is fixedly installed at one end of the through rod, and a limiting block is rotatably connected to the outer wall of the rotating block, and a locking block is provided on the outer wall of the bearing plate at the position corresponding to the limiting block.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the cooperation of the main column, the first side column, the second side column, and the first to fifth windings, can significantly reduce the size, footprint, and cost of external high-voltage power supply by utilizing a single-phase three-column iron core structure and avoiding magnetic saturation through magnetic flux shunting after the input of external high-voltage power. It can also achieve precise voltage regulation of 330kV and below by adjusting the winding connections, adapting to the AT power supply requirements of high-speed electrified railways, while reducing iron losses to meet energy conservation and consumption reduction requirements. By cross-winding the windings to meet specific impedance voltage requirements, and with the current balance and safe grounding design, it ultimately achieves efficient power conversion and stable transmission, comprehensively ensuring the safety and reliability of traction power supply. 2. This utility model, through the cooperation of sliding grooves, slots, locking blocks, flipping blocks, through rods, rotating blocks, limiting blocks, and engaging blocks, enables quick assembly and disassembly via convenient insertion, requiring no complex tools and significantly reducing the time cost and operational difficulty of later inspection and maintenance. Simultaneously, it allows for precise interval adjustment, ensuring the core structure's force balance and positional stability, and preventing magnetic circuit breaks due to improper fit. This fundamentally guarantees the integrity of the magnetic circuit, preventing a decrease in power conversion efficiency or equipment failure, and collaboratively constructing a low-loss, high-smoothness complete magnetic path, further improving power conversion efficiency. The application of insulating materials effectively isolates current interference, ensuring circuit insulation performance and preventing safety hazards caused by insulation failure, comprehensively considering the equipment's practicality, stability, and safety. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of an AT-powered single-phase three-column five-winding traction transformer; Figure 2 A schematic diagram of the internal structure of a single-phase three-column five-winding traction transformer for AT power supply; Figure 3 A schematic diagram of the winding mechanism of an AT-powered single-phase three-column five-winding traction transformer; Figure 4 A schematic diagram of the slot structure of an AT-powered single-phase three-column five-winding traction transformer; Figure 5A schematic diagram of the block structure of an AT-powered single-phase three-column five-winding traction transformer; Figure 6 A schematic diagram of the limiting block structure of an AT-powered single-phase three-column five-winding traction transformer; In the diagram: 1. Base; 2. Housing; 3. Inspection door panel; 4. Snap-fit ​​seat; 5. Bearing plate; 6. Winding mechanism; 601. Main column; 602. First side column; 603. Second side column; 604. First winding; 605. Second winding; 606. Third winding; 607. Fourth winding; 608. Fifth winding; 7. Connecting mechanism; 701. Slide groove; 702. Snap-fit ​​groove; 703. Snap-fit ​​block; 704. Placement groove; 705. Flipping block; 706. Connecting shaft; 707. Filling cavity; 708. Through rod; 709. Rotating block; 710. Limiting block; 711. Snap-fit ​​block. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0022] Example 1: Please see Figure 1 - Figure 3 This is the first embodiment of the present invention. This embodiment provides an AT-powered single-phase three-column five-winding traction transformer, including: a base 1, a housing 2, a maintenance door 3, a mounting bracket 4, and a support plate 5; the housing 2 is fixedly installed on the top of the base 1, the maintenance door 3 is movably connected to the front end of the housing 2, the mounting bracket 4 is fixedly installed on the inner wall of the housing 2, and the support plate 5 is slidably connected to the top of the mounting bracket 4, and also includes: Winding mechanism 6 and docking mechanism 7; winding mechanism 6 is located above bearing plate 5, and docking mechanism 7 is located inside snap-fit ​​seat 4.

[0023] Specifically, the winding mechanism 6 includes: a main post 601, a first side post 602, a second side post 603, a first winding 604, a second winding 605, a third winding 606, a fourth winding 607, and a fifth winding 608. The main post 601 is fixedly installed on the outer wall of the bearing plate 5, the first side post 602 is fixedly installed on another bearing plate 5, and the second side post 603 is fixedly installed on the top of the bearing plate 5 on one side of the main post 601.

[0024] Furthermore, the alternating magnetic flux generated by the main column 601 after being energized is partly transmitted directly through the main column 601, and partly shunted through the first side column 602 and the second side column 603, so as to avoid the magnetic flux of the main column 601 being too concentrated and causing magnetic saturation.

[0025] Specifically, the outer wall of the main column 601 consists of a first winding 604, a second winding 605, a third winding 606, a fourth winding 607, and a fifth winding 608 arranged in a concentric winding pattern. The fourth winding 607 and the fifth winding 608 are each composed of an upper and a lower part.

[0026] Furthermore, the windings are arranged sequentially from the main post 601 outwards. This structure allows for tighter magnetic coupling between each winding and the core of the main post 601, reducing magnetic flux leakage, lowering magnetic losses, and improving power conversion efficiency. At the same time, the concentric arrangement can avoid electromagnetic interference between windings with different functions, ensuring stable input / output signals.

[0027] Specifically, the upper end of the fourth winding 607 is connected to the upper part of the fifth winding 608 via terminal m, and the lower beginning of the fourth winding 607 is connected to the upper part of the fifth winding 608 via terminal n. The upper and lower parts of the fifth winding 608 are connected in series.

[0028] Furthermore, by switching the upper part of the fifth winding 608 and adjusting the effective number of turns of the fourth winding 607, precise voltage regulation on the high-voltage input side can be achieved to cope with fluctuations in railway traction load and ensure stable output voltage on the traction side. It also balances the current of the fourth winding 607, avoids local saturation of the magnetic circuit of the main column 601, and reduces iron loss. It is compatible with different voltage levels of 330kV and below, and does not require changing the winding. Only the tap outlet and the number of series turns need to be adjusted to adapt to the grid input, meeting the compatibility requirements of AT power supply scenarios.

[0029] Specifically, the first end of the first winding 604 is led out as the output terminal T on the power supply side of the transformer, and the end of the second winding 605 is led out as the output terminal F on the power feed side of the transformer.

[0030] Furthermore, the first end of the first winding 604 is led out as the output terminal T of the transformer power supply side, which is used to directly provide core power supply to the traction system, and the end of the second winding 605 is led out as the output terminal F of the transformer feeder side, which is used to undertake the feeder function of the traction network. The two work together to construct a complete traction power transmission circuit under the AT power supply mode, ensuring the power supply of railway traction equipment.

[0031] Specifically, the end T1' of the first winding 604 and the end T2' of the third winding 606 are connected, and the beginning of the third winding 606 and the beginning of the second winding 605 are directly led out as the grounding terminal N.

[0032] Furthermore, the end T1' of the first winding 604 is connected to the end T2' of the third winding 606, which can balance the current of the first winding 604 and the third winding 606 and ensure impedance matching between the two to meet the stability requirements of AT power supply output. The beginning of the third winding 606 and the beginning of the second winding 605 are led out as grounding terminals N, which can build a safe grounding loop to prevent winding overvoltage, and at the same time stabilize the output of the feeder side to ensure the safety of traction power supply.

[0033] Specifically, the first end H1 of the fourth winding 607 is directly led out as the A phase of the transformer input terminal, and the last end H2' of the fourth winding 607 is directly led out as the B phase of the transformer input terminal.

[0034] Furthermore, it directly receives power from the external high-voltage power grid, providing power to the transformer and serving as the power input port for the entire traction power supply system.

[0035] In operation, external high-voltage grid power is input through the A-phase (first end H1) and B-phase (last end H2') terminals of the fourth winding 607 to receive high-voltage power. The current causes the main column 601 to generate alternating magnetic flux. Part of the magnetic flux is shunted through the first side column 602 and the second side column 603 to prevent magnetic saturation of the main column 601 (which also reduces the size of the transformer and lowers costs). The fifth winding 608 (divided into upper and lower sections and connected in series) is tapped to the fourth winding 607. By switching the tap of the fifth winding 608, the effective number of turns of the fourth winding 607 can be adjusted to achieve precise voltage regulation at voltage levels of 330kV and below and reduce iron losses (meeting the requirements of energy conservation and consumption reduction). The first winding 604 (with its first end being the power supply side output terminal T), the second winding 605 (with its last end being the feeder side output terminal F), and the third winding 606, which are concentrically arranged on the outer wall of the main column 601, induce current under alternating magnetic flux. The first winding 604 and the second winding 605 cooperate to form a complete traction power transmission circuit. The end T1' of the first winding 604 and the end T2' of the third winding 606 are connected to balance the current and ensure impedance matching. The first end of the third winding 606 and the first end of the second winding 605 are led out as ground terminals N to prevent winding overvoltage (to ensure power supply safety). Finally, the power conversion and stable transmission adapted to AT power supply are realized.

[0036] In summary, the external high-voltage power grid energy is first input through the A-phase (first end H1) and B-phase (last end H2') of the fourth winding 607, completing the high-voltage power reception. After the current flows through the fourth winding 607, it causes the main column 601 to generate alternating magnetic flux. Part of this flux is directly transmitted along the main column 601, and the other part is shunted through the first side column 602 and the second side column 603. This avoids magnetic saturation of the main column 601 due to the concentration of magnetic flux, and, relying on the single-phase three-column iron core structure, significantly reduces the transformer size, floor space, and production costs. The fifth winding 608 is connected to the fourth winding 607 by a tap. By switching the tap of the fifth winding 608, the effective number of turns of the fourth winding 607 can be flexibly adjusted: on the one hand, it achieves precise voltage regulation for voltage levels of 330kV and below, enabling the transformer to adapt to high-speed electrified railways with AT power supply mode; on the other hand, it reduces iron loss and meets the customer's energy-saving requirements. To reduce energy consumption, the outer wall of the main column 601 is concentrically arranged with a first winding 604 (the first end being the power supply side output terminal T), a second winding 605 (the last end being the feed side output terminal F), and a third winding 606. These three windings generate electrical energy under the action of alternating magnetic flux. The second winding 605 is cross-wound to the main column 601, which can accurately meet the requirements of impedance voltage Z21=Z31 and (3Z21+Z31-Z23-1) / 4<0.45Ω. The first winding 604 and the second winding 605 work together to form a complete traction power transmission circuit. At the same time, the end T1' of the first winding 604 is connected to the end T2' of the third winding 606, which can balance the winding current and ensure impedance matching. The first end of the third winding 606 and the first end of the second winding 605 are connected to the ground terminal N, which effectively prevents winding overvoltage and ensures power supply safety. Ultimately, it achieves efficient power conversion and stable transmission adapted to AT power supply scenarios.

[0037] Example 2: Please see Figure 1 - Figure 6 This is the second embodiment of the present utility model.

[0038] Specifically, the docking mechanism 7 includes: a sliding groove 701, a slot 702, a locking block 703, a placement groove 704, a flipping block 705, a connecting shaft 706, a filling cavity 707, a through rod 708, a rotating block 709, a limiting block 710, and a locking block 711. The sliding groove 701 is formed on the outer wall of the locking seat 4, and the inner wall of the sliding groove 701 is provided with a slot 702. The locking block 703 is slidably connected inside the slot 702.

[0039] Furthermore, by engaging the card block 703 with the card slot 702, the bearing plate 5 can slide stably along the slide groove 701. Through the material of the bearing plate 5 and the material of the iron yoke, and by using the same assembly method, a magnetic path can be formed between the main column 601, the first side column 602 and the second side column 603.

[0040] Specifically, the top of the support plate 5 is provided with a mounting groove 704, and a flipping block 705 is rotatably connected inside the mounting groove 704. A connecting shaft 706 is fixedly installed on the outer wall of the flipping block 705. A filling cavity 707 is provided inside the flipping block 705, and a through rod 708 extends out of the filling cavity 707.

[0041] Furthermore, the through rod 708 is directly threaded to the filling cavity 707, which facilitates the adjustment of the length to suit the distance between the three bearing plates 5, and after adjustment, they abut against each other, so that the main column 601 is parallel to the first side column 602 and the second side column 603.

[0042] Specifically, a rotating block 709 is fixedly installed at one end of the through rod 708, and a limiting block 710 is rotatably connected to the outer wall of the rotating block 709. A locking block 711 is provided on the outer wall of the bearing plate 5 at the position corresponding to the limiting block 710.

[0043] Furthermore, the locking block 711 facilitates the corresponding limiting block 710 to dock with the carrier plate 5 to avoid misalignment, ensuring that the three carrier plates 5 maintain contact and abutment, forming a magnetic path so that the entire device can operate normally.

[0044] During use and installation, first insert the locking block 703 at the bottom of the bearing plate 5 into the locking slot 702 of the locking seat 4 along the sliding groove 701. This structural design facilitates the disassembly and assembly of the bearing plate 5, providing convenience for subsequent maintenance operations. Then, rotate the flipping block 705 around the connecting shaft 706 to make it pass through the placement slot 704, so that the position of the protruding rod 708 can be flexibly adjusted. After the protruding rod 708 is adjusted to the target position, insert the limiting block 710 and make it abut against the locking block 711. By further fine-tuning the protruding rod 708, the three bearing plates 5 can be kept evenly spaced, thereby ensuring that the main column 601, the first side column 602, and the second side column 603 are in balance. In this state, the limiting block 710 is rotated and engaged with the through rod 708 via the rotating block 709. This design can prevent the limiting block 710 from not being able to fit tightly against the bearing plate 5 during the adjustment process, thus preventing magnetic circuit breakage due to poor fit and ensuring the normal operation of the transformer. Special attention should be paid to the following: the materials of the bearing plate 5, through rod 708, rotating block 709, limiting block 710 and engaging block 711 must be consistent with the iron yoke. At the same time, a magnetic filler layer is filled into the filling cavity 707. Through material matching and filler filling, a complete magnetic path is constructed to ensure smooth magnetic flux transmission. The locking block 703 must be made of insulating material to avoid affecting the circuit insulation performance.

[0045] In summary, the bearing plate 5 is inserted into the card holder 4 through the sliding groove 701 and the card slot 702, which enables quick disassembly and assembly without complicated tools to reduce maintenance costs. The rotating flip block 705 adjusts the through rod 708 and positions it through the limit block 710 and the locking block 711. This ensures that the three bearing plates 5 are evenly spaced to ensure the balance between the main column 601 and the side column, and also avoids magnetic circuit breakage caused by the limit block 710 not fitting tightly. At the same time, the bearing plate 5 and other components are made of the same material as the yoke, and the filling cavity 707 is filled with magnetic filler to build a low-loss complete magnetic path and improve the power conversion efficiency. The card block 703 is made of insulating material to ensure circuit insulation, taking into account the practicality, stability and safety of the equipment in all aspects.

[0046] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0047] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0048] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine task in design, manufacturing, and production without requiring extensive experimentation.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An AT-powered single-phase three-limb five-winding traction transformer, characterized in that: include: The enclosure comprises a base (1), a housing (2), an inspection door panel (3), a mounting bracket (4), and a support plate (5); the housing (2) is fixedly installed on the top of the base (1), the inspection door panel (3) is movably connected to the front end of the housing (2), the mounting bracket (4) is fixedly installed on the inner wall of the housing (2), and the support plate (5) is slidably connected to the top of the mounting bracket (4). The enclosure also includes: Winding mechanism (6) and docking mechanism (7); the winding mechanism (6) is located above the bearing plate (5), and the docking mechanism (7) is located inside the snap-fit ​​seat (4).

2. The AT-powered single-phase three-limb five-winding traction transformer according to claim 1, characterized in that: The winding mechanism (6) includes: a main column (601), a first side column (602), a second side column (603), a first winding (604), a second winding (605), a third winding (606), a fourth winding (607), and a fifth winding (608). The main column (601) is fixedly installed on the outer wall of the bearing plate (5), and the first side column (602) is fixedly installed on another bearing plate (5). The second side column (603) is fixedly installed on the top of the bearing plate (5) on one side of the main column (601).

3. The AT-powered single-phase three-limb five-winding traction transformer according to claim 2, characterized in that: The outer wall of the main column (601) consists of a first winding (604), a second winding (605), a third winding (606), a fourth winding (607), and a fifth winding (608) arranged in concentric windings outwards. The fourth winding (607) and the fifth winding (608) are each composed of upper and lower parts.

4. The AT-powered single-phase three-limb five-winding traction transformer according to claim 3, characterized in that: The upper end of the fourth winding (607) is connected to the upper part of the fifth winding (608) with end m, and the lower beginning of the fourth winding (607) is connected to the upper part of the fifth winding (608) with end n. The upper and lower parts of the fifth winding (608) are connected in series.

5. The AT-powered single-phase three-limb five-winding traction transformer according to claim 3, characterized in that: The first end of the first winding (604) is led out as the output terminal T of the transformer power supply side, and the end of the second winding (605) is led out as the output terminal F of the transformer feed side.

6. The AT-powered single-phase three-limb five-winding traction transformer according to claim 3, characterized in that: The end T1' of the first winding (604) and the end T2' of the third winding (606) are connected, and the beginning of the third winding (606) and the beginning of the second winding (605) are directly led out as the grounding terminal N.

7. The AT-powered single-phase three-limb five-winding traction transformer according to claim 3, characterized in that: The first end H1 of the fourth winding (607) is directly led out as phase A of the transformer input terminal, and the last end H2' of the fourth winding (607) is directly led out as phase B of the transformer input terminal.

8. The AT-powered single-phase three-limb five-winding traction transformer according to claim 1, characterized in that: The docking mechanism (7) includes: a sliding groove (701), a slot (702), a locking block (703), a placement groove (704), a flipping block (705), a connecting shaft (706), a filling cavity (707), a through rod (708), a rotating block (709), a limiting block (710), and a locking block (711). The sliding groove (701) is opened on the outer wall of the locking seat (4), and the inner wall of the sliding groove (701) is provided with a slot (702). The locking block (703) is slidably connected inside the slot (702).

9. A single-phase three-limb five-winding traction transformer with AT power supply according to claim 8, characterized in that: The top of the support plate (5) is provided with a mounting groove (704), and a flipping block (705) is rotatably connected inside the mounting groove (704). A connecting shaft (706) is fixedly installed on the outer wall of the flipping block (705). A filling cavity (707) is provided inside the flipping block (705), and a through rod (708) extends out from inside the filling cavity (707).

10. A single-phase three-limb five-winding traction transformer for AT power supply according to claim 9, characterized in that: One end of the through rod (708) is fixedly installed with a rotating block (709), and the outer wall of the rotating block (709) is rotatably connected to a limiting block (710). The outer wall of the bearing plate (5) is provided with a locking block (711) at the position corresponding to the limiting block (710).

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