Self-switching tap module for oil-immersed transformer

Abstract

The invention relates to a self-switching tap module for an oil-immersed transformer, and relates to the technical field of smart power grids, the self-switching tap module comprises a shell, a contact assembly and a shell cover, the periphery of the shell is provided with a plurality of wiring ports for connecting taps, and the top surface of the shell cover is fixedly provided with a driving motor with an output shaft extending into the shell and driving the contact assembly to act; locking pieces are arranged on the periphery of the shell, two symmetrical connecting plates are rotationally installed on the top face of the shell cover, and the connecting plates can rotate oppositely to be in the installation state of abutting against the top face of the shell cover and rotate reversely to be in the transportation state of abutting against the top face of the shell; vertically upward fixing plates are vertically and fixedly arranged on the side faces, close to each other, of the two connecting plates in the installation state, positioning plates far away from each other are vertically and fixedly arranged on the upper side edges of the two fixing plates at the moment, and a plurality of positioning holes are formed in the positioning plates; according to the transformer, the driving motor and the contact assembly are integrated in the shell, the overall size and height of the transformer are greatly reduced, and related cost is remarkably reduced.

Description

Technical Field

[0001] This application relates to the technical field of smart grids, and in particular to a self-switching tap module for oil-immersed transformers. Background Technology

[0002] Against the backdrop of rapid development of smart grids, the large-scale application of new energy scenarios such as photovoltaics and energy storage has placed higher demands on the adaptability and reliability of power transmission equipment. Oil-immersed transformers, as core equipment for power conversion and voltage regulation, are widely used in these new energy grid-connected and energy storage systems due to their excellent insulation performance and heat dissipation. Their core components typically include an oil tank to contain insulating oil, a sealed cover on top of the tank, and a coil winding structure inside the tank. These components work together to achieve stable power conversion and transmission, making them one of the key devices for ensuring the efficient grid connection of new energy power.

[0003] Existing oil-immersed transformers used in new energy scenarios such as photovoltaics and energy storage employ a mature manual voltage regulation structure design. Its core components include the tank, tank cover, and internal coil winding structure. A control panel is fixedly installed on the inner wall of the tank cover, and several taps of the coil windings are connected to this control panel. A tap changer is fixedly mounted on the top surface of the tank cover. An extension rod extending to the control panel is located on the inner side of the tap changer. A conductive rod is fixed on the rod, which can abut against the contacts at the ends of the taps, and the conductive rod is equipped with an insulating protective structure. Operators manually rotate the tap changer, driving the extension rod and conductive rod to rotate synchronously, achieving precise disconnection or engagement of each tap, thereby completing the transformer voltage regulation and meeting the power adaptation requirements of new energy scenarios. The overall structure and working principle comply with the technical specifications for oil-immersed transformers.

[0004] However, the tap changer is directly exposed on the top surface of the enclosure, which increases the overall height and size of the transformer. This not only increases the space occupied during equipment storage but also requires more transport space, significantly increasing storage and transportation costs. In addition, in narrow installation environments such as photovoltaic power plants and energy storage containers, the operating space around the tap changer on the top surface of the enclosure is limited, making it difficult for staff to manually rotate the switch smoothly. This makes it impossible to quickly and accurately complete tap switching and voltage regulation, seriously affecting the operation and maintenance efficiency of the equipment. It may even lead to voltage regulation errors due to inconvenient operation, posing a hidden danger to the stable operation of the new energy power system. There is room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide a self-switching tap module for oil-immersed transformers, which solves the problems of high transportation costs and inconvenient tap switch control when the transformer is used in narrow spaces in the above-mentioned related technologies.

[0006] The self-switching tap module for oil-immersed transformers provided in this application adopts the following technical solution: A self-switching tap module for an oil-immersed transformer includes an upward-opening housing, a contact assembly located inside the housing, and a detachable cover fixed to the housing. The outer periphery of the housing has several connection ports for tap access. A drive motor with an output shaft extending into the housing and driving the contact assembly is fixed to the top surface of the cover. A locking element is provided on the outer periphery of the housing. Two symmetrical connecting plates are rotatably mounted on the top surface of the cover. The connecting plates can rotate towards each other to an installation state where they abut against the top surface of the cover, and away from each other to a transport state where they abut against the top surface of the housing. When the two connecting plates are in the installation state, vertically upward-facing fixing plates are vertically fixed to the sides of the two connecting plates that are close to each other. Positioning plates that are far apart from each other are vertically fixed to the upper edges of the two fixing plates. The positioning plates have several positioning holes. When the connecting plates are in the transport state, the fixing plates protect the outer periphery of the housing, and the locking element locks the fixing plates in this state. When the connecting plates are in the installation state, the positioning plates can be fixedly connected to the inner side of the transformer tank cover.

[0007] By adopting the above technical solution, the drive motor and contact assembly are integrated into the housing, and the module is installed inside the transformer tank cover with a built-in oil tank, replacing the traditional exposed tap changer. This significantly reduces the overall size and height of the transformer, reduces space occupation during storage and transportation, and significantly lowers related costs. The drive motor enables remote automatic control of tap switching, eliminating the need for manual operation by staff on-site. This completely solves the problems of limited operating space and inconvenient voltage regulation in narrow installation environments, improving maintenance efficiency and voltage regulation accuracy, and avoiding system stability risks caused by operational errors. The connecting plate can be flexibly switched between transportation and installation states. During transportation, the fixing plate provides protection to the outer perimeter of the housing, and the locking components ensure stability. During installation, the module is quickly fixed by the positioning plate, balancing transportation safety and installation convenience.

[0008] Optionally, locking blocks can be detachably installed on the sides of the connecting plate and the positioning plate that are close to each other. The locking component includes an upper locking ring and a lower locking ring that slide on the outer periphery of the housing. Locking slots are provided on the sides of the upper locking ring and the lower locking ring that are far apart from each other. When the connecting plate is in the transport state, the upper locking ring and the lower locking ring can slide back to back, so that the locking blocks can be engaged in the corresponding locking slots.

[0009] By adopting the above technical solution, when the connecting plate is in the transportation state, the upper and lower locking rings slide in opposite directions, so that the locking block is engaged in the locking slot, thereby achieving reliable locking of the fixed plate and preventing the protective structure from loosening due to shaking during transportation. The detachable design of the locking block facilitates structural adjustment in the installation state, and the sliding locking ring is easy to operate. It not only ensures the effectiveness of the outer perimeter protection of the shell during transportation, but also does not affect the normal assembly in the installation state, thereby improving the structural reliability and usage flexibility of the module.

[0010] Optionally, a plurality of dovetail slide rails are fixedly provided on the outer periphery of the housing along the vertical direction. Anti-disengagement screws are fixedly provided on the upper and lower parts of the dovetail slide rails. Dovetail notches that slide with the dovetail slide rails are provided on the inner walls of the upper and lower locking rings.

[0011] By adopting the above technical solution, the sliding cooperation between the dovetail slide rail and the dovetail notch provides precise guidance for the upper and lower locking rings, ensuring smooth sliding and stable trajectory. The dovetail structure fits tightly, effectively preventing the locking rings from shifting. Combined with the anti-loosening screw, it can prevent them from falling off during sliding. This not only ensures the reliability of the locking operation during transportation, but also simplifies the structural assembly and improves the safety and convenience of using the module.

[0012] Optionally, the upper and lower locking rings are provided with arc-shaped notches on their adjacent sides, which are opposite to the wiring port. An elastic pad is fixed on the inner wall of the arc-shaped notch. When the connecting plate is in the installation state, the upper and lower locking rings can slide towards each other and be detachably connected. The two opposing arc-shaped notches together form a limiting cavity for the cable of the paired connecting tap to abut against.

[0013] By adopting the above technical solution, the upper and lower locking rings slide towards each other to form a limiting cavity, and the elastic pad presses against the tap cable to achieve stable cable positioning and prevent it from shaking and wearing. The arc-shaped notch corresponds to the wiring port, adapts to the cable routing, and the detachable connection design facilitates cable installation and maintenance, improving the module's ability to protect cables and its ease of use.

[0014] Optionally, a fixing rod is fixedly provided on the bottom surface of the upper locking ring, and a fixing slot for the fixing rod to be inserted is provided on the top surface of the lower locking ring.

[0015] By adopting the above technical solution, the upper and lower locking rings can be quickly and detachably connected in the installation state by using the cooperation of the fixed plug and the fixed slot, ensuring that the two are firmly connected to form a complete limiting cavity. The structure is simple and the connection is reliable, which not only facilitates quick assembly during installation, but also ensures the continuous limiting effect on the tap cable, improving the ease of operation and structural stability.

[0016] Optionally, a guide slope is provided on the end edge of the fixing rod.

[0017] By adopting the above technical solution, a guiding effect is provided for the insertion of the plug rod into the fixed slot, effectively reducing the difficulty of alignment and making the operation of the upper and lower locking rings facing each other smoother and more efficient. The guide slope can reduce the hard collision between the plug rod and the slot, avoid structural wear, extend the service life of the components, and at the same time help to quickly form a stable limiting cavity, further improving the convenience of module installation and the durability of the structure.

[0018] Optionally, the housing has a vertically positioned middle rod on both sides of the fixing plate at its upper part. The two ends of the middle rod are vertically fixed with fixing protrusions, and the outer periphery of the fixing protrusions is provided with elastic snap-fit ​​members. The connecting plate and the positioning plate have fixing notches on their adjacent side edges for the fixing protrusions to snap into. The inner wall of the fixing notches has positioning grooves for the elastic snap-fit ​​members to snap into. The locking plug is fixedly connected to the adjacent side edges of the two fixing protrusions.

[0019] By adopting the above technical solution, in the transportation state, the fixed protrusion is engaged with the fixed notch, and the elastic snap-fit ​​is embedded in the positioning groove. This not only quickly completes the detachable installation of the locking block, but also ensures its connection stability, laying a reliable foundation for the subsequent locking ring locking. The ingenious structural design achieves the dual functions of locking block installation and state fixation with the same component, eliminating the need for additional complex parts and simplifying the assembly process. The detachable connection method facilitates later maintenance and component replacement, and the design of the elastic snap-fit ​​makes installation and disassembly operations more convenient, significantly improving the structural practicality and usage flexibility of the module.

[0020] Optionally, the elastic snap-fit ​​component includes a compression spring and an arc-shaped protrusion. The fixed protrusion has a placement groove for the compression spring and the arc-shaped protrusion to be placed in. The compression spring squeezes one side of the arc-shaped protrusion, causing a part of the arc-shaped protrusion to protrude from the opening of the placement groove. The outer surface of the protruding part of the arc-shaped protrusion is an arc surface, and the arc length corresponding to this arc surface is a minor arc.

[0021] By adopting the above technical solution, an elastic snap-fit ​​component is formed by a compression spring and an arc-shaped protrusion. The compression spring provides a continuous elastic force to ensure that the arc-shaped protrusion is stably snapped into the positioning groove, thus ensuring the reliability of the connection. The arc surface design (minor arc) of the arc-shaped protrusion makes it smoother for the fixing protrusion to snap into / out of the fixing notch, reducing jamming and wear, simplifying operation, extending the life of the component, and further improving the convenience of module assembly and maintenance.

[0022] Optionally, the intermediate rod is an elastic telescopic rod whose length can be actively shortened, and the fixing notch is provided with a first slot on the inner wall of the fixing plate; when the connecting plate is in the installation state, the intermediate rod is placed horizontally, the two fixing protrusions are inserted into the fixing notch, and the two locking blocks are inserted into the first slot under the action of the shortening elastic force of the intermediate rod, thereby locking the state of the two fixing plates.

[0023] By adopting the above technical solution, the middle rod is placed horizontally during installation, and the fixing protrusion engages with the fixing notch to provide basic positioning. The force generated by its elastic shortening drives the locking plug into the first slot, further locking the two fixing plates and preventing the module from loosening due to vibration during operation, thus improving installation stability. The middle rod has the dual function of locking the plug during transportation and locking the fixing plates during installation, eliminating the need for additional locking components and simplifying the structural design. The elastic telescopic structure makes the locking plug engage more tightly and is easy to operate. Locking can be completed simply by placing it horizontally, which not only ensures the structural reliability of the module after installation but also improves assembly efficiency. At the same time, the elastic telescopic characteristics adapt to different spacing requirements, enhancing structural adaptability.

[0024] Optionally, a guide slope is provided on the outer periphery of the locking block.

[0025] By adopting the above technical solution, it can be guided to smoothly slide into the first slot under the elastic force of the middle rod, reducing the difficulty of alignment and making the locking operation of the fixing plate in the installation state more convenient and efficient; at the same time, it reduces the hard collision between the plug and the slot, avoids structural wear, ensures the tightness of the lock and the durability of the components, and improves the smoothness of module assembly.

[0026] In summary, this application includes the following beneficial technical effects: In this application, the drive motor and contact assembly are integrated into the housing, and the module is installed inside the transformer tank cover with a built-in oil tank, replacing the traditional exposed tap changer. This significantly reduces the overall size and height of the transformer, reduces the space occupied during storage and transportation, and significantly lowers related costs. The drive motor enables remote automatic control of tap switching, eliminating the need for manual operation by staff on-site. This completely solves the problems of limited operating space and inconvenient voltage regulation in narrow installation environments, improves maintenance efficiency and voltage regulation accuracy, and avoids system stability risks caused by operational errors. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram illustrating the installation and assembly of the connecting plate in an embodiment of this application; Figure 3 This is an exploded structural diagram illustrating the installation and distribution of the shell and cover in an embodiment of this application; Figure 4 This is a cross-sectional structural diagram illustrating the installation and cooperation of the locking plug and the locking slot in an embodiment of this application; Figure 5 yes Figure 4 An enlarged schematic diagram of part A in the middle; Figure 6 This is a partial structural diagram illustrating the installation and cooperation of the upper and lower locking rings in an embodiment of this application; Figure 7 This is a cross-sectional structural diagram illustrating the installation and cooperation of the upper and lower locking rings in an embodiment of this application; Figure 8 yes Figure 7 Enlarged schematic diagram of part B in the middle; Figure 9 This is a schematic diagram illustrating the installation and assembly of the intermediate rod in an embodiment of this application; Figure 10 This is a partial cross-sectional view of the installation and assembly of the intermediate rod in an embodiment of this application; Figure 11 yes Figure 10 An enlarged schematic diagram of section C.

[0028] In the diagram, 1. Housing; 11. Wiring port; 12. Dovetail slide rail; 2. Housing cover; 3. Drive motor; 4. Locking component; 41. Upper locking ring; 411. Locking slot; 412. Arc-shaped notch; 413. Elastic pad; 414. Fixed insert rod; 4141. Guide slope; 415. Dovetail notch; 42. Lower locking ring; 421. Fixed slot; 5. Connecting plate; 51. Fixed notch; 52. Positioning groove; 53. First slot; 6. Fixed plate; 7. Positioning plate; 71. Positioning hole; 8. Locking insert block; 81. Guide slope; 9. Middle rod; 91. Fixed protrusion; 911. Placement groove; 92. Elastic snap-fit ​​component; 921. Compression spring; 922. Arc-shaped protrusion. Detailed Implementation

[0029] The present application will be further described in detail below with reference to all the accompanying drawings.

[0030] Example: Reference Figure 1 , Figure 2 and Figure 3 A self-switching tap module for an oil-immersed transformer includes an upward-facing housing 1, a contact assembly (not shown in the figure) located inside the housing 1, and a cover 2 detachably fixed to the housing 1. The housing 1 and the cover 2 have circular cross-sections. The outer periphery of the housing 1 is provided with several wiring ports 11 for tap access. The top surface of the cover 2 is fixed with a drive motor 3 whose output shaft extends into the housing 1 and drives the contact assembly to move. A locking element 4 is provided on the outer periphery of the housing 1. Two symmetrical connecting plates 5 are rotatably installed on the top surface of the housing cover 2. The connecting plates 5 can rotate towards each other to the installation state where they abut against the top surface of the housing cover 2, and rotate away from each other to the transport state where they abut against the top surface of the housing 1. When the two connecting plates 5 are in the installation state, vertically upward fixing plates 6 are fixed on the sides of the two connecting plates 5 that are close to each other. At this time, vertically opposite positioning plates 7 are fixed on the upper edges of the two fixing plates 6. Two positioning holes 71 are provided on the positioning plates 7. When the tap module is packaged and transported separately, the connecting plate 5 is adjusted to the transport state. At this time, the two fixing plates 6 protect the outer periphery of the housing 1, and the locking piece 4 locks the state of the fixing plate 6. When the tap module is installed and applied, the connecting plate 5 is adjusted to the installation state, and the tap module is fixed on the inner side of the transformer tank cover by screws passing through the positioning hole 71. At this time, the tap module is installed inside the oil tank, reducing the overall size of the transformer. At the same time, it can also drive the motor 3 to remotely regulate the voltage of the transformer.

[0031] Reference Figure 3 and Figure 4 The connecting plate 5 and the positioning plate 7 are detachably installed with locking blocks 8 on their sides close to each other. The locking component 4 includes an upper locking ring 41 and a lower locking ring 42 that slide on the outer periphery of the housing 1, and a locking slot 411 is provided on the sides of the upper locking ring 41 and the lower locking ring 42 that are far apart from each other. Two dovetail slide rails 12 are fixedly provided on the outer periphery of the housing 1 along the vertical direction. Anti-disengagement screws (not shown in the figure) are fixedly provided on the upper and lower parts of the dovetail slide rails 12. Dovetail notches 415 that slide with the dovetail slide rails 12 are provided on the inner walls of the upper locking ring 41 and the lower locking ring 42. When the connecting plate 5 is in the transport state, the staff slide the upper locking ring 41 and the lower locking ring 42 in opposite directions, so that the locking plug 8 is inserted into the corresponding locking slot 411, thereby locking the connecting plate 5 and the positioning plate 7 in this state.

[0032] Reference Figure 3 , Figure 4 and Figure 5 The housing 1 has two intermediate rods 9 located on both sides of the fixing plate 6 along the vertical direction on the upper part of the housing 1. The two ends of the intermediate rods 9 are vertically fixed with fixing protrusions 91. The outer periphery of the fixing protrusions 91 is provided with elastic snap-fit ​​members 92. The connecting plate 5 and the positioning plate 7 are both provided with fixing notches 51 for the fixing protrusions 91 to be snapped into on their side edges. The inner wall of the fixing notch 51 is provided with a positioning groove 52 for the elastic snap-fit ​​members 92 to be snapped into. The locking plug 8 is fixedly connected to the side of the two fixing protrusions 91 that are close to each other. When the connecting plate 5 is in the transport state, the middle rod 9 is placed vertically, the two fixing protrusions 91 are respectively inserted into the fixing notch 51, and the elastic snap-fit ​​92 is inserted into the corresponding positioning groove 52. At this time, the two locking blocks 8 can be detached and installed, which makes it easy for the locking part 4 to lock the fixing plate 6 in the corresponding state.

[0033] Reference Figure 4 and Figure 5The elastic snap-fit ​​component 92 includes a compression spring 921 and an arc-shaped protrusion 922. The fixed protrusion 91 has a placement groove 911 for the compression spring 921 and the arc-shaped protrusion 922 to be placed. The compression spring 921 squeezes one side of the arc-shaped protrusion 922, causing a part of the arc-shaped protrusion 922 to protrude from the opening of the placement groove 911. The outer surface of the protruding part of the arc-shaped protrusion 922 is an arc surface, and the arc length corresponding to this arc surface is a minor arc.

[0034] Reference Figure 6 , Figure 7 and Figure 8 Both the upper locking ring 41 and the lower locking ring 42 have arc-shaped notches 412 on their sides that are close to each other, which are opposite to the wiring port 11. The inner wall of the arc-shaped notches 412 is fixed with elastic pads 413 made of rubber. Two fixing rods 414 are fixed on the bottom surface of the upper locking ring 41, and guide slopes 4141 are provided on the edge of the end of the fixing rods 414. The top surface of the lower locking ring 42 has a fixing slot 421 for the fixing rods 414 to be inserted.

[0035] When the connecting plate 5 is in the installation state (that is, when the cable connected to the tap is connected from the terminal 11 to the inside of the housing 1), the upper locking ring 41 and the lower locking ring 42 can slide towards each other and achieve a detachable connection (through the fixed plug rod 414 and the fixed slot 421). At this time, the two opposite arc-shaped notches 412 together form a limiting cavity. At this time, the elastic pad 413 on the inner wall of the limiting cavity is used to press against the outer periphery of the cable connected to the tap.

[0036] Reference Figure 9 , Figure 10 and Figure 11 The middle rod 9 is an elastic telescopic rod whose length can be actively shortened. This is a conventional elastic telescopic structure, which will not be described in detail here. The outer periphery of the locking block 8 is provided with a guide slope 81, and the fixing notch 51 is provided with a first slot 53 facing the inner wall of the fixing plate 6. When the connecting plate 5 is in the installation state, the operator can place the intermediate rod 9 horizontally so that the two fixing protrusions 91 are respectively inserted into the fixing notch 51. At this time, the two locking blocks 8 are inserted into the first slot 53 along the guide slope 81 under the action of the shortening elastic force of the intermediate rod 9. In this way, the combined structure of the intermediate rod 9, the fixing protrusions 91 and the locking blocks 8 can further lock the state of the two fixing plates 6, and better protect the drive motor 3.

[0037] The implementation principle of this application embodiment is as follows: In the transport state, the connecting plate 5 rotates back to back until it abuts against the top surface of the housing 1, the middle rod 9 is placed vertically, and the fixing protrusions 91 at both ends of the rod are engaged in the fixing notches 51 of the connecting plate 5 and the positioning plate 7. The arc-shaped protrusions 922 of the elastic snap-fit ​​part 92 are engaged in the positioning groove 52 under the action of the compression spring 921, thus completing the detachable installation of the locking plug 8. Then, the upper locking ring 41 and the lower locking ring 42 are manually controlled to move back to back, so that the locking plug 8 is engaged in the locking slot 411, thereby realizing the state locking of the connecting plate 5 and the fixing plate 6. At the same time, the fixing plate 6 protects the outer periphery of the housing 1.

[0038] During installation, the connecting plate 5 rotates to the opposite direction until it abuts against the top surface of the cover 2. The tap module is fixed to the inside of the transformer box cover by the positioning hole 71 of the positioning plate 7 and screws. The middle rod 9 is placed horizontally, and its elastic shortening force drives the locking plug 8 to be inserted into the first slot 53 along the guide slope 81, further locking the fixing plate 6. The upper and lower locking rings 42 slide towards each other and are connected to the fixing slot 421 through the fixing plug 414. The arc-shaped notch 412 forms a limiting cavity, and the elastic pad 413 presses against the tap cable. The drive motor 3 can drive the contact assembly to move, realize remote voltage adjustment, and the module has a built-in oil tank to reduce the size of the transformer.

[0039] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-switching tap module for an oil-immersed transformer, comprising an upward-facing housing (1), a contact assembly located inside the housing (1), and a detachable cover (2) fixed to the housing (1), wherein the outer periphery of the housing (1) is provided with a plurality of wiring ports (11) for tap access, and a drive motor (3) with an output shaft extending into the housing (1) and driving the contact assembly is fixed on the top surface of the cover (2); characterized in that, The outer periphery of the housing (1) is provided with a locking element (4), and two symmetrical connecting plates (5) are rotatably installed on the top surface of the housing cover (2). The connecting plates (5) can rotate towards each other to the installation state where they abut against the top surface of the housing cover (2) and towards each other to the transportation state where they abut against the top surface of the housing (1). When the two connecting plates (5) are in the installation state, vertically fixed plates (6) are fixedly mounted on the sides of the two connecting plates (5) that are close to each other. At this time, the upper edges of the two fixed plates (6) are fixedly mounted with positioning plates (7) that are far apart from each other. The positioning plates (7) are provided with a plurality of positioning holes (71). When the connecting plates (5) are in the transportation state, the fixing plates (6) protect the outer peripheral surface of the housing (1). At this time, the locking member (4) locks the state of the fixing plates (6). When the connecting plates (5) are in the installation state, the positioning plates (7) can be fixedly connected to the inner side of the transformer box cover.

2. The self-switching tap module for an oil-immersed transformer according to claim 1, characterized in that, The connecting plate (5) and the positioning plate (7) are detachably mounted with locking blocks (8) on their sides close to each other. The locking component (4) includes an upper locking ring (41) and a lower locking ring (42) that slide on the outer periphery of the housing (1). The upper locking ring (41) and the lower locking ring (42) are provided with locking slots (411) on their opposite sides; the upper locking ring (41) and the lower locking ring (42) can slide back to back when the connecting plate (5) is in transport state, so that the locking block (8) can be inserted into the corresponding locking slot (411).

3. The self-switching tap module for an oil-immersed transformer according to claim 2, characterized in that, Several dovetail slide rails (12) are fixedly provided on the outer periphery of the housing (1) in the vertical direction. Anti-dislodgement screws are fixedly provided on the upper and lower parts of the dovetail slide rails (12). Dovetail notches (415) that slide with the dovetail slide rails (12) are provided on the inner walls of the upper locking ring (41) and the lower locking ring (42).

4. The self-switching tap module for an oil-immersed transformer according to claim 2, characterized in that, The upper locking ring (41) and the lower locking ring (42) are provided with arc-shaped notches (412) on their sides that are close to each other, which are opposite to the wiring port (11). An elastic pad (413) is fixed on the inner wall of the arc-shaped notch (412). The upper locking ring (41) and the lower locking ring (42) can slide towards each other and be detachably connected when the connecting plate (5) is in the installation state. The two opposing arc-shaped notches (412) at this time jointly enclose the limiting cavity where the cables of the paired connecting taps abut against each other.

5. A self-switching tap module for an oil-immersed transformer according to claim 4, characterized in that, A fixing rod (414) is fixed on the bottom surface of the upper locking ring (41), and a fixing slot (421) for the fixing rod (414) to be inserted is provided on the top surface of the lower locking ring (42).

6. A self-switching tap module for an oil-immersed transformer according to claim 5, characterized in that, A guide slope (4141) is provided on the end edge of the fixed insertion rod (414).

7. A self-switching tap module for an oil-immersed transformer according to claim 2, characterized in that, The housing (1) is provided with intermediate rods (9) on both sides of the fixing plate (6) along the vertical direction above. Fixed protrusions (91) are fixed vertically on both ends of the intermediate rods (9). Elastic snap-fit ​​parts (92) are provided on the outer periphery of the fixed protrusions (91). The connecting plate (5) and the positioning plate (7) are provided with a fixing notch (51) on their side edges for the fixing protrusion (91) to be inserted. The inner wall of the fixing notch (51) is provided with a positioning groove (52) for the elastic snap-fit ​​(92) to be inserted. The locking plug (8) is fixedly connected to the side edges of the two fixing protrusions (91) that are close to each other.

8. A self-switching tap module for an oil-immersed transformer according to claim 7, characterized in that, The elastic snap-fit ​​component (92) includes a compression spring (921) and an arc-shaped protrusion (922). The fixing protrusion (91) has a placement groove (911) for the compression spring (921) and the arc-shaped protrusion (922) to be placed. The compression spring (921) squeezes one side of the arc-shaped protrusion (922) so that a part of the arc-shaped protrusion (922) protrudes from the opening of the placement groove (911). The outer surface of the protruding part of the arc-shaped protrusion (922) is an arc surface, and the arc length corresponding to the arc surface is a minor arc.

9. A self-switching tap module for an oil-immersed transformer according to claim 7, characterized in that, The intermediate rod (9) is an elastic telescopic rod whose length can be actively shortened, and the fixing notch (51) is provided with a first slot (53) on the inner wall of the fixing plate (6); When the connecting plate (5) is in the installation state, the intermediate rod (9) is placed horizontally, and the two fixed protrusions (91) are inserted into the fixed notch (51). The two locking blocks (8) are inserted into the first slot (53) under the action of the shortening elastic force of the intermediate rod (9), thus locking the state of the two fixed plates (6).

10. A self-switching tap module for an oil-immersed transformer according to claim 9, characterized in that, The locking block (8) has a guide slope (81) on its outer periphery.

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