Automatic switching device for tap switch of oil-immersed transformer

Abstract

The invention relates to the technical field of transformer tap switches, in particular to an automatic switching device for an oil-immersed transformer tap switch. The transformer shell comprises a transformer shell body, cooling fins are fixedly connected to the surface of the transformer shell body, a tap switch assembly is arranged in an inner cavity of the transformer shell body, a drive adjusting assembly is arranged at the top of the tap switch assembly, and the drive adjusting assembly drives the tap switch assembly to rotate annularly through a gear so as to switch current. And a positioning assembly is arranged on the inner wall of the driving adjusting assembly. The sleeve sleeves the surface of the switch, and the notch is formed in the surface of the sleeve, so that the sleeve is in contact fit with the surface of the switch, and the switch can be easily driven to do circular motion in the process that the connecting gear drives the sleeve to rotate, so that the switch drives the rotating contact to make contact with fixed contacts with different current parameters; and the potential safety hazard of manual operation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer tap changers, and more specifically, to an automatic switching device for oil-immersed transformer tap changers. Background Art

[0002] Oil-immersed transformers are used in power systems to step up or step down voltages to meet the needs of different users and equipment. When the output voltage of a generator fluctuates, the monitoring system will detect the output voltage of the step-up transformer in real time. When the output voltage deviates from the set value, the output of the transformer needs to be cut off. After the transformer is powered off, the staff will adjust the tap changer to a position that can reduce the number of turns of the primary winding or increase the number of turns of the secondary winding according to the instructions. After the power is restored, the output voltage of the step-up transformer will increase. For example, the switching transformer and switching power supply disclosed in Chinese Patent Publication No. CN104681253A;

[0003] When adjusting the output voltage of the above tap changer, first, it is necessary to operate the transformer under power-off conditions. After the power is off, there is no current passing through the circuit, which can provide a relatively safe working environment for the operator. However, for some places with high requirements for power supply continuity, such as various medical equipment in hospitals, the continuous operation is related to the life safety of patients. Once the power is cut off due to the adjustment of the tap changer, life support equipment (such as ventilators and cardiac pacemakers) may stop working, directly endangering the lives of patients, and surgeries in the operating room will be forced to interrupt, resulting in serious medical accidents. Data centers undertake a large amount of data storage and processing tasks. A short power outage may cause the servers to shut down, interrupt the ongoing data processing and transmission, resulting in data loss and system failures. Restoring data often requires a large amount of time and cost. In view of this, we propose an automatic switching device for oil-immersed transformer tap changers. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic switching device for oil-immersed transformer tap changers to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides an automatic switching device for oil-immersed transformer tap changers, including a main body of the transformer housing, heat dissipation fins are fixedly connected to the surface of the main body of the transformer housing, and a tap changer assembly is arranged in the inner cavity of the main body of the transformer housing;

[0006] A drive adjustment assembly is arranged on the top of the tap changer assembly, and the drive adjustment assembly drives the tap changer assembly to rotate in a ring through gears to switch the current;

[0007] A positioning assembly is arranged on the inner wall of the drive adjustment assembly, the positioning assembly is inserted into the inner wall of the drive adjustment assembly, and the positioning assembly is used to limit the rotation of the drive adjustment assembly;

[0008] By means of the engagement between the ratchet structure provided inside the positioning component and the card slots on the inner wall of the drive adjustment component, the rotation of the drive adjustment component is restricted, and the rotation of the tap-changer component is synchronously restricted by the drive adjustment component.

[0009] As a further improvement of this technical solution, the tap-changer component includes an iron core fixedly connected to the bottom of the inner cavity of the main body of the transformer housing. A plurality of groups of windings are sleeved on the surface of the iron core. The end parts of the plurality of groups of windings are respectively fixedly connected with connection terminals. The surfaces of the plurality of groups of connection terminals are fixedly connected to the inner wall of the iron core. The ends of the plurality of groups of connection terminals away from the windings are respectively fixedly connected with fixed contacts. The fixed contacts are located at the top of the iron core, and a rotating contact is in contact with the top of the fixed contacts;

[0010] The plurality of groups of fixed contacts are distributed in an annular array on the top of the iron core;

[0011] The rotating contact rotates along a circumferential path above the iron core and contacts the surface of the fixed contact.

[0012] As a further improvement of this technical solution, a rotating shaft is fixedly connected to the top of the rotating contact. The surface of the rotating shaft extends out of the inner wall of the main body of the transformer housing and is fixedly connected with a switch. The switch is located at the top of the main body of the transformer housing.

[0013] As a further improvement of this technical solution, the drive adjustment component includes a sleeve sleeved on the surface of the switch. A notch is formed on the surface of the sleeve, and the inner wall of the notch is in contact with the surface of the switch. A connecting gear is fixedly connected to the top of the sleeve, and a driving gear is meshed with the outer edge of the connecting gear;

[0014] The sleeve is made of PE insulating material.

[0015] As a further improvement of this technical solution, the bottom of the sleeve is rotatably connected with a support frame. The bottom of the support frame is fixedly connected to the top of the main body of the transformer housing, and the surface of the switch rotates inside the inner wall of the support frame;

[0016] The bottom of the inner cavity of the support frame is rotatably connected with the bottom of the driving gear;

[0017] The connecting gear and the driving gear are located inside the inner cavity of the support frame.

[0018] As a further improvement of this technical solution, a driving motor is fixedly connected to the top of the inner cavity of the support frame. The output end of the driving motor is fixedly connected with the driving gear by means of a motor shaft.

[0019] As a further improvement of this technical solution, the positioning component includes a sliding column slidably connected to the inner wall of the support frame. An anti-collision sleeve is fixedly connected to the end of the sliding column;

[0020] The anti-collision sleeve is located on the inner wall of the groove opened by the connecting gear.

[0021] As a further improvement of the technical solution, an insulating handle is fixedly connected to one end of the sliding column away from the anti-collision sleeve;

[0022] The outer surface of the support frame is provided with a threaded opening, and the inner wall of the threaded opening can be threadedly connected with the surface of the insulating handle.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the automatic switching device of the oil-immersed transformer tap changer, by sleeve-fitting the sleeve on the surface of the switch and opening a notch on the surface of the sleeve so that it contacts and cooperates with the surface of the switch, the switch can be easily driven to perform circular motion during the process of the connecting gear driving the sleeve to rotate, so that the switch drives the rotating contact to contact the fixed contact with different current parameters, thus avoiding the safety hazard of manual operation. In addition, the PE insulating material used in the sleeve has good insulation performance, which helps to reduce electrical interference.

[0025] 2. In the automatic switching device of the oil-immersed transformer tap changer, the insulating handle is rotated by hand to separate it from the inner wall of the threaded opening, and then the sliding column is pushed to slide on the inner wall of the supporting frame. The anti-collision sleeve will gradually embed into the groove opened by the connecting gear. Once the anti-collision sleeve is completely stuck in the inner wall of the groove, it can effectively limit the rotation of the connecting gear, preventing the subsequent driving adjustment component due to misoperation, causing the connecting gear to rotate accidentally, thereby ensuring the stability of the output current of the tap changer component.

[0026] In addition, the insulating handle also serves as a reminder. If the output current of the transformer is to be changed, the staff must first turn the insulating handle to slide the sliding column outward, allowing the anti-collision sleeve to disengage from the groove of the connecting gear and remove the restriction on the rotation of the connecting gear. Only then can the drive motor be operated to drive the connecting gear to rotate, and then the switch is rotated to complete the adjustment of the transformer current. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure assembly of the automatic switching device of the oil-immersed transformer tap changer of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall structure of the driving and adjusting assembly of the automatic switching device of the oil-immersed transformer tap changer of the present invention;

[0029] Figure 3 It is a schematic structural diagram of a tap changer assembly of an automatic switching device for an oil-immersed transformer tap changer of the present invention;

[0030] Figure 4Front view plane schematic diagram of the tap-changer assembly of the oil-immersed transformer tap-changer automatic switching device of the present invention;

[0031] Figure 5 Schematic diagram of the winding structure of the oil-immersed transformer tap-changer automatic switching device of the present invention;

[0032] Figure 6 Schematic diagram of the fixed contact structure of the oil-immersed transformer tap-changer automatic switching device of the present invention;

[0033] Figure 7 Schematic diagram of the positioning component structure of the oil-immersed transformer tap-changer automatic switching device of the present invention;

[0034] Figure 8 Schematic diagram of the inner cavity structure of the support frame of the oil-immersed transformer tap-changer automatic switching device of the present invention;

[0035] Figure 9 Schematic diagram of the switch structure of the oil-immersed transformer tap-changer automatic switching device of the present invention;

[0036] The meanings of each label in the figure are as follows:

[0037] 100, main body of the transformer housing; 110, heat dissipation fins;

[0038] 200, tap-changer assembly; 210, iron core; 220, winding; 221, terminal; 230, fixed contact; 240, rotating contact; 241, rotating shaft; 242, switch;

[0039] 300, drive adjustment component; 310, support frame; 3101, threaded port; 320, connecting gear; 321, insulating sleeve; 330, drive gear; 340, drive motor;

[0040] 400, positioning component; 410, insulating handle; 420, sliding column; 430, anti-collision sleeve. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment 1

[0043] Please refer to Figures 1-9As shown in the figure, this embodiment provides an automatic switching device for a tap changer of an oil-immersed transformer, which includes a main body 100 of the transformer housing. A heat dissipation fin 110 is fixedly connected to the surface of the main body 100 of the transformer housing. A tap changer assembly 200 is arranged in the inner cavity of the main body 100 of the transformer housing;

[0044] A drive adjustment assembly 300 is arranged at the top of the tap changer assembly 200. The drive adjustment assembly 300 drives the tap changer assembly 200 to rotate in a circular motion through gears to switch the current;

[0045] A positioning assembly 400 is arranged on the inner wall of the drive adjustment assembly 300. The positioning assembly 400 is inserted into the inner wall of the drive adjustment assembly 300. The positioning assembly 400 is used to limit the rotation of the drive adjustment assembly 300;

[0046] Through the cooperation of the tooth structure arranged inside the positioning assembly 400 and the card slot on the inner wall of the drive adjustment assembly 300, the rotation of the drive adjustment assembly 300 is restricted, and the rotation of the tap changer assembly 200 is synchronously restricted by the drive adjustment assembly 300;

[0047] Considering that when the current fluctuates, it is necessary to rotate the switch of the transformer to adjust it to the corresponding gear to ensure voltage stability and meet the requirements of power transmission and use. However, when adjusting the switch of the existing device, it is necessary to cut off the power supply of the transformer first. The transformer switch is in a live state during normal operation, and there is a certain voltage on its surface. When the current fluctuates, arc, electric spark and other phenomena may occur at the electrical connection and contact parts inside the switch. If the switch is directly rotated by hand at this time, the human body will contact the live switch, and the current will be introduced into the ground through the human body, causing an electric shock accident. Therefore, by connecting the drive end of the tap changer assembly 200 to the drive adjustment assembly 300, the drive adjustment assembly 300 automatically drives its own operation according to the level of the output current of the tap changer assembly 200, and then realizes the precise adjustment of the corresponding current of the tap changer assembly 200. This automatic adjustment method not only effectively avoids the safety hazards of manual operation, but also improves the adjustment efficiency and ensures the stable operation of the power system.

[0048] Also, considering that after the drive adjustment component 300 completes the drive of the tap-changer component 200 and rotates it to the appropriate position corresponding to the current, it is necessary to prevent subsequent operators from accidentally touching the drive adjustment component 300 during the operation of the transformer, which may cause it to drive the tap-changer component 200 to accidentally change the current level, thereby having an adverse impact on the stable operation of the power system. Therefore, by inserting the positioning component 400 into the inner wall of the drive adjustment component 300 so that it is stuck at the position where the drive adjustment component 300 currently drives the tap-changer component 200, when there is no need to adjust the current of the tap-changer component 200, this design can effectively prevent the problem that the current output by the tap-changer component 200 is inconsistent with the actual required current due to accidental operation, ensuring the stable operation of the power system.

[0049] On the above basis, the specific structure is disclosed in detail:

[0050] In order to enable the tap-changer component 200 to output different currents during rotation, it is necessary to further disclose the parts of the tap-changer component 200. Therefore, the tap-changer component 200 includes an iron core 210 fixedly connected to the bottom of the inner cavity of the transformer housing main body 100. A plurality of groups of windings 220 are sleeved on the surface of the iron core 210. The ends of the plurality of groups of windings 220 are respectively fixedly connected with connection terminals 221. The surfaces of the plurality of groups of connection terminals 221 are fixedly connected to the inner wall of the iron core 210. The ends of the plurality of groups of connection terminals 221 far from the windings 220 are respectively fixedly connected with fixed contacts 230. The fixed contacts 230 are located at the top of the iron core 210. A rotating contact 240 is in contact with the top of the fixed contact 230;

[0051] The plurality of groups of fixed contacts 230 are distributed in an annular array on the top of the iron core 210;

[0052] The rotating contact 240 rotates in a circular path above the iron core 210 and is in contact with the surface of the fixed contact 230. When the transformer is operating normally, the rotating contact 240 remains in contact with a fixed contact 230 at a specific position, and the corresponding winding 220 is connected to the circuit. At this time, the transformer performs voltage conversion according to the established transformation ratio, providing a stable output voltage for the power system to meet the power consumption needs of users and equipment.

[0053] In order to enable the rotating contact 240 to rotate so that it can be connected to different currents, a rotating shaft 241 is fixedly connected to the top of the rotating contact 240. The surface of the rotating shaft 241 extends out of the inner wall of the transformer housing main body 100 and is fixedly connected to a switch 242. The switch 242 is located at the top of the transformer housing main body 100. When the switch 242 is manually rotated, it can drive the connected rotating shaft 241 to rotate. As the rotating shaft 241 rotates, the rotating contact 240 linked to it will rotate above the iron core 210. In this process, since multiple fixed contacts 230 are arranged in an annular array on the top of the iron core 210, and each group of fixed contacts 230 corresponds to different current parameters, during the rotation of the rotating contact 240, it can sequentially contact the fixed contacts 230 with different current parameters, thereby changing the access state of the winding 220 and realizing the adjustment of the output current of the transformer.

[0054] Considering that if the current parameters need to be adjusted, the switch 242 needs to be manually rotated. However, considering that it is relatively dangerous to manually rotate the adjustment switch 242 of the transformer, generally the transformer will stop power supply for adjustment, which will take a long time. At this time, the parts of the drive adjustment component 300 need to be further disclosed. Therefore, the drive adjustment component 300 includes a sleeve 321 sleeved on the surface of the switch 242. The surface of the sleeve 321 is provided with a notch, and the inner wall of the notch contacts the surface of the switch 242. A connecting gear 320 is fixedly connected to the top of the sleeve 321, and a driving gear 330 is meshed with the outer edge of the connecting gear 320;

[0055] The sleeve 321 is made of PE insulating material. Through the rotation of the driving gear 330, it can be meshed with the outer edge of the connecting gear 320, thereby driving the rotation of the connecting gear 320. Through the rotation of the connecting gear 320, it can drive the sleeve 321 to rotate. Since the notch provided on the surface of the sleeve 321 contacts the surface of the switch 242, during the rotation of the sleeve 321, with the contact and cooperation between the notch and the surface of the switch 242, the sleeve 321 can easily drive the switch 242 to perform a circular motion.

[0056] Considering that when the sleeve 321 is sleeved on the surface of the switch 242, in order to ensure that the connecting gear 320 can operate smoothly driven by the rotation of the driving gear 330, the sleeve 321 needs to be effectively supported. Therefore, the bottom of the sleeve 321 is rotatably connected to a support frame 310. The bottom of the support frame 310 is fixedly connected to the top of the transformer housing main body 100, and the surface of the switch 242 rotates inside the inner wall of the support frame 310;

[0057] The bottom of the inner cavity of the support frame 310 is rotatably connected to the bottom of the driving gear 330;

[0058] The connecting gear 320 and the driving gear 330 are located in the inner cavity of the support frame 310. By arranging the support frame 310 on the top of the transformer housing body 100, the connecting gear 320 and the driving gear 330 are arranged in the inner cavity of the support frame 310, which can protect them from dust entering. And the sleeve 321 rotates at the bottom of the inner cavity of the support frame 310, which can support the sleeve 321. By rotating the bottom of the connecting gear 320 at the bottom of the inner cavity of the support frame 310, the connecting gear 320 can be supported and fixed at the same time.

[0059] In order to enable the driving gear 330 to rotate and drive the connecting gear 320 to rotate, therefore, a driving motor 340 is fixedly connected to the top of the inner cavity of the support frame 310. The output end of the driving motor 340 is fixedly connected to the driving gear 330 by means of a motor shaft. By the operation of the driving motor 340, the driving gear 330 can be driven to rotate, and the rotation of the driving gear 330 can drive the connecting gear 320 to rotate.

[0060] In order to prevent the output current of the tap-changer assembly 200 from abnormally changing due to misoperation by subsequent staff after the driving and adjusting assembly 300 completes the current switching operation of the tap-changer assembly 200, it is necessary to further disclose the parts of the positioning assembly 400. Therefore, the positioning assembly 400 includes a sliding column 420 slidably connected to the inner wall of the support frame 310, and an anti-collision sleeve 430 is fixedly connected to the end of the sliding column 420;

[0061] The anti-collision sleeve 430 is located on the inner wall of the groove opened in the connecting gear 320; when the sliding column 420 slides on the inner wall of the support frame 310, it can drive the anti-collision sleeve 430 to be embedded in or separated from the groove of the connecting gear 320, so as to realize the restriction or release of the rotation of the connecting gear 320, and it can prevent subsequent staff from accidentally changing the current output of the tap-changer assembly 200 due to mis-touching the driving and adjusting assembly 300 and other reasons.

[0062] In order to enable the sliding column 420 to slide on the inner wall of the support frame 310 and fix the anti-collision sleeve 430 on the inner wall of the groove opened in the connecting gear 320, therefore, an insulating handle 410 is fixedly connected to the end of the sliding column 420 away from the anti-collision sleeve 430, which is convenient for the operator to hold and operate;

[0063] A threaded port 3101 is opened on the outer surface of the support frame 310, and the inner wall of this threaded port 3101 can be threadedly connected to the surface of the insulating handle 410. When it is necessary to position the connecting gear 320, the operator holds the insulating handle 410 and slides the sliding column 420 towards the inner cavity of the support frame 310. As the sliding column 420 moves, the anti-collision sleeve 430 will gradually approach the groove opened on the connecting gear 320. When the surface of the anti-collision sleeve 430 is completely stuck into the groove of the connecting gear 320, specifically, it can be referred toFigure 8 The operator manually rotates the insulating handle 410 to tightly connect the insulating handle 410 with the threaded opening 3101 on the surface of the support frame 310. At this time, the insulating handle 410 is fixed to the support frame 310. Meanwhile, the anti-collision sleeve 430 is also firmly stuck in the slot of the connecting gear 320, which can effectively prevent the connecting gear 320 from rotating and ensure that the tap-changer assembly 200 is in a stable and reliable current state after adjustment.

[0064] In summary, the working process of the present invention is as follows:

[0065] When the current of the transformer is unstable, first, rotate the insulating handle 410 manually to separate the insulating handle 410 from the threaded opening 3101 on the surface of the support frame 310. Then, slide the insulating handle 410 outwards to drive the sliding column 420 to separate the anti-collision sleeve 430 from the connecting gear 320. Then, the driving motor 340 can drive the driving gear 330 to rotate. The rotation of the driving gear 330 can drive the connecting gear 320 to rotate. The rotation of the connecting gear 320 can drive the sleeve 321 to rotate. Since the slot opened on the surface of the sleeve 321 contacts the surface of the switch 242, during the rotation of the sleeve 321, with the aid of the contact and cooperation between the slot and the surface of the switch 242, the sleeve 321 can easily drive the switch 242 to perform a circular motion. At this time, the rotation of the switch 242 can drive the electric rotating shaft 241 connected thereto to rotate. As the rotating shaft 241 rotates, the rotating contact 240 linked thereto will rotate above the iron core 210. During this process, since multiple sets of fixed contacts 230 are arranged in an annular array on the top of the iron core 210 and each set of fixed contacts 230 corresponds to different current parameters, during the rotation of the rotating contact 240, it can sequentially contact the fixed contacts 230 with different current parameters, thereby changing the access state of the winding 220 and realizing the adjustment of the output current of the transformer. Then, the operator manually rotates the insulating handle 410 to tightly connect the insulating handle 410 with the threaded opening 3101 on the surface of the support frame 310. The anti-collision sleeve 430 is also firmly stuck in the slot of the connecting gear 320, which can effectively prevent the connecting gear 320 from rotating and ensure that the tap-changer assembly 200 is in a stable and reliable current state after adjustment.

[0066] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An automatic switching device for a tap changer of an oil-immersed transformer, comprising a main body of the transformer housing (100), wherein a heat dissipation fin (110) is fixedly connected to the surface of the main body of the transformer housing (100), and is characterized in that: Inside the inner cavity of the transformer housing main body (100), a tap changer assembly (200) is provided; At the top of the tap changer assembly (200), a driving and adjusting assembly (300) is provided. The driving and adjusting assembly (300) drives the tap changer assembly (200) to rotate in a circular shape through gears to switch the current; On the inner wall of the driving and adjusting assembly (300), a positioning assembly (400) is provided. The positioning assembly (400) is inserted into the inner wall of the driving and adjusting assembly (300), and the positioning assembly (400) is used to limit the rotation of the driving and adjusting assembly (300); Through the cooperation of the tooth structure provided inside the positioning assembly (400) and the card slots on the inner wall of the driving and adjusting assembly (300), the rotation of the driving and adjusting assembly (300) is restricted, and the rotation of the tap changer assembly (200) is synchronously restricted through the driving and adjusting assembly (300).

2. The automatic tap-changer device for oil-immersed transformers according to claim 1, characterized in that: The tap changer assembly (200) includes an iron core (210) fixedly connected to the bottom of the inner cavity of the transformer housing main body (100). Multiple groups of windings (220) are sleeved on the surface of the iron core (210). Terminal posts (221) are respectively fixedly connected to the ends of multiple groups of the windings (220). The surfaces of multiple groups of the terminal posts (221) are fixedly connected to the inner wall of the iron core (210). Fixed contact heads (230) are respectively fixedly connected to the ends of multiple groups of the terminal posts (221) far away from the windings (220). The fixed contact heads (230) are located at the top of the iron core (210), and a rotating contact head (240) contacts the top of the fixed contact heads (230); Multiple groups of the fixed contact heads (230) are distributed in an annular array at the top of the iron core (210); The rotating contact head (240) rotates along a circumferential path above the iron core (210) and contacts the surface of the fixed contact heads (230).

3. The automatic tap-changer device for oil-immersed transformers according to claim 2, characterized in that: At the top of the rotating contact head (240), a rotating shaft (241) is fixedly connected. The surface of the rotating shaft (241) extends out of the inner wall of the transformer housing main body (100) and is fixedly connected to a switch (242). The switch (242) is located at the top of the transformer housing main body (100).

4. The on-load tap-changer automatic switching device for an oil-immersed transformer according to claim 3, characterized in that: The driving and adjusting assembly (300) includes a sleeve (321) sleeved on the surface of the switch (242). A notch is provided on the surface of the sleeve (321), and the inner wall of the notch contacts the surface of the switch (242). A connecting gear (320) is fixedly connected to the top of the sleeve (321), and a driving gear (330) is meshed with the outer edge of the connecting gear (320); The sleeve (321) is made of PE insulating material.

5. The automatic tap-changer device for oil-immersed transformers according to claim 4, characterized in that: The bottom of the sleeve (321) is rotatably connected to a support frame (310). The bottom of the support frame (310) is fixedly connected to the top of the transformer housing main body (100), and the surface of the switch (242) rotates inside the inner wall of the support frame (310); The bottom of the inner cavity of the support frame (310) is rotatably connected to the bottom of the driving gear (330); The connecting gear (320) and the driving gear (330) are located inside the inner cavity of the support frame (310).

6. The automatic tap-changer device for oil-immersed transformers according to claim 5, characterized in that: A driving motor (340) is fixedly connected to the top of the inner cavity of the support frame (310), and the output end of the driving motor (340) is fixedly connected to a driving gear (330) by means of a motor shaft.

7. The automatic tap-changer device for oil-immersed transformers according to claim 1, characterized in that: The positioning assembly (400) includes a sliding column (420) slidably connected to the inner wall of the support frame (310), and an anti-collision sleeve (430) is fixedly connected to the end of the sliding column (420); The anti-collision sleeve (430) is located on the inner wall of the groove formed in the connecting gear (320).

8. The on-load tap-changer automatic switching device for an oil-immersed transformer according to claim 7, characterized in that: An insulating handle (410) is fixedly connected to one end of the sliding column (420) away from the anti-collision sleeve (430); A threaded opening (3101) is formed on the outer surface of the support frame (310), and the inner wall of the threaded opening (3101) can be threadedly connected to the surface of the insulating handle (410).

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