An adaptive compensation control device and method for on-load voltage regulation of a transformer
By combining a rotary closing structure and elastic elements, the problem of poor contact caused by wear in the on-load tap changer of the transformer is solved, thus achieving reliability and continuity of voltage regulation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGXI MINGZHENG SUSTION EQUIP
- Filing Date
- 2026-04-09
- Publication Date
- 2026-06-09
AI Technical Summary
Existing on-load tap changers for transformers suffer from contact wear due to mechanical friction during long-term use, which can easily lead to poor contact and control failure, affecting the reliability of voltage regulation.
It adopts a rotary closed structure, which uses a combination of multiple elastic elements, conductive rolling contacts and moving contacts to compensate for wear through rotational force, prevent poor contact and control failure, and improve the reliability of voltage regulation.
It achieves adaptive wear compensation during on-load voltage regulation, ensuring that the conductive contacts always maintain good contact, and improving the continuity and reliability of voltage regulation.
Smart Images
Figure CN122177640A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of transformer equipment technology, specifically relating to an adaptive compensation control device and method for on-load tap changer of a transformer. Background Technology
[0002] On-load tap changers are the core components of power transformers for achieving on-load voltage regulation. Their core function is to stabilize or regulate the output voltage by changing the effective turns ratio when the transformer is energized and connected to a load, thereby switching the winding group connections. Specifically, increasing the number of turns on the high-voltage side results in a decrease in the low-voltage side voltage, while decreasing the number of turns on the high-voltage side results in an increase in the low-voltage side voltage.
[0003] Existing transformers are equipped with on-load tap changers that can be remotely and wirelessly controlled. For example, a retrieved Chinese invention patent application (publication number: CN117854901A) discloses an on-load tap changer control method and control device for distribution transformers, including an on-load tap changer, a controller, and a voltage acquisition device installed inside or next to the transformer tank. The controller determines whether a command needs to be issued through the control method. If a command needs to be issued, it operates the tap changer to change the number of turns in the high-voltage coil connected to the circuit of the transformer, thereby changing the turns ratio of the high-voltage and low-voltage coils of the transformer to regulate the voltage. The controller uses the detected low-output voltage of the transformer and the terminal load voltage as control inputs to calculate the appropriate tap adjustment target.
[0004] In practical applications, on-load tap changers are mainly classified into rotary sliding type and oscillating contact type. During operation, the internal conductive contacts of these two types of tap changers need to slide or oscillate relative to each other while maintaining a tight contact, resulting in mechanical friction. With repeated operation, the contacts will inevitably wear down, potentially leading to poor contact or even control failure after long-term operation, thus jeopardizing the reliability of voltage regulation. Summary of the Invention
[0005] The purpose of this invention is to provide an adaptive compensation control device and method for on-load tap changer of a transformer, which can realize voltage regulation function through a rotary closed structure, adaptively compensate for wear, prevent poor contact or control failure, and improve the reliability of voltage regulation process.
[0006] The specific technical solution adopted by this invention is as follows:
[0007] An adaptive compensation control device for on-load tap changing of a transformer includes a transformer body, coils, and a motor. The output terminal of the motor is connected to a transmission assembly. The transformer body contains:
[0008] The first conductive fork, the first elastic element, and the conductive rolling contact are connected vertically in sequence.
[0009] Multiple movable contacts, with a second elastic element, a third elastic element, and a terminal block connected to the coil spaced apart on the outer side of each movable contact;
[0010] During operation, the motor and transmission assembly provide rotational force, and the first conductive fork drives the conductive rolling contact to rotate and contact the movable contact block connected to the coil with a specified number of turns;
[0011] When the conductive rolling contact and the movable contact block experience wear, the first elastic element, the second elastic element, and the third elastic element push the conductive rolling contact and the movable contact block to compensate for the wear.
[0012] As an alternative, the first conductive fork is in the shape of a bent opening, and both ends of the bent opening are rotatably connected to conductive rolling contacts, and the movable contact block is in the shape of a fan ring with arc surfaces at both ends.
[0013] When the conductive rolling contact rotates, it contacts the movable contact along the arc surface until it compresses the second and third elastic elements, thus preventing interference between the conductive rolling contact and the movable contact.
[0014] As an alternative, the transmission assembly includes three first rotating shafts, with a right-angle transmission coupling connecting two adjacent first rotating shafts, one of the first rotating shafts extending into the transformer body and connected to a first conductive fork, and a plurality of the movable contacts surrounding the first rotating shafts;
[0015] Wherein, the distance between two adjacent movable contacts is less than the distance between two adjacent conductive rolling contacts, and the length of the movable contact is less than the distance between two adjacent conductive rolling contacts;
[0016] When one of the conductive rolling contacts spans two movable contacts, the other conductive rolling contact remains electrically connected to the movable contacts, improving the continuity of on-load tap changer.
[0017] As an optional solution, the transformer body is also provided with a first flange connected to the transmission assembly. The first conductive fork is connected to the transmission assembly through the first flange, and a second rotating shaft for supporting the conductive rolling contact is fixed on the first conductive fork.
[0018] The first elastic element and the conductive rolling contact are both sleeved on the outside of the second rotating shaft. When the conductive rolling contact experiences wear, the first elastic element provides a squeezing force along the axial direction of the second rotating shaft, so that the conductive rolling contact remains directly facing the movable contact block.
[0019] As an alternative, a second flange and a plurality of folded plates are sequentially welded to the end of the first elastic member away from the first conductive fork along the second rotation axis;
[0020] During operation, the first elastic element pushes the folded plate to contact the conductive rolling contact, preventing the conductive rolling contact from rubbing against the first elastic element, and the first conductive fork is electrically connected to the conductive rolling contact through the second rotating shaft and the folded plate.
[0021] As an optional solution, the transformer body is also provided with multiple third flanges and hinges, and the second elastic element is welded in a ring shape between the third flange and the movable contact block, and the two ends of the third elastic element are fixed to the inner side of the second elastic element;
[0022] Meanwhile, the third flange is connected to the adjacent movable contact block by a hinge, and the hinge is used to vertically limit the movable contact block;
[0023] When the second and third elastic elements are compressed, they generate elastic potential energy. When the conductive rolling contact leaves the movable contact block, the movable contact block reduces its distance from the conductive rolling contact under the action of elastic potential energy, thereby compensating for the wear of the conductive rolling contact and the movable contact block.
[0024] As an optional solution, the movable contact block is provided with a sliding groove, and the outer side of the conductive rolling contact is integrally provided with a guide boss that matches the sliding groove;
[0025] When the conductive rolling contact presses against the movable contact block, the guide boss enters the groove, causing the conductive rolling contact to vertically straighten the movable contact block through the guide boss, preventing the movable contact block from tilting vertically.
[0026] As an optional solution, a lead sheet is connected between the movable contact and the adjacent terminal block, and a second conductive fork and a fourth flange are connected in sequence along the radial direction of the top of the terminal block, with the fourth flange fixed inside the transformer body;
[0027] When the conductive rolling contact presses against the movable contact block, the lead sheet is pulled by the movable contact block, causing it to deform, so that the movable contact block maintains an electrical connection with the coil through the lead sheet and the terminal block.
[0028] As an alternative, multiple terminal blocks are welded at axial intervals on the outer side of the terminal blocks, and the multiple terminal blocks are connected to positions with different numbers of turns of the coil through the terminal blocks.
[0029] An adaptive compensation control method for on-load tap changer of a transformer, using the adaptive compensation control device for on-load tap changer of the transformer as described above, includes the following steps:
[0030] The starting motor provides rotational force, causing the first conductive fork to drive the conductive rolling contact to rotate and contact the movable contact block connected to the coil with a specified number of turns, thus connecting the taps of different turns of the high-voltage side coil into the circuit and realizing voltage regulation under load.
[0031] When the conductive rolling contact experiences wear, the first elastic element provides a compressive force along its axial direction. The conductive rolling contact is restricted to a specified position by the compressive force, so that the conductive rolling contact is always facing the movable contact block, preventing the conductive rolling contact from being misaligned with the movable contact block.
[0032] The second and third elastic elements accumulate elastic potential energy. When the conductive rolling contact leaves the movable contact block, the second and third elastic elements release the elastic potential energy to push the movable contact block to reset, thereby compensating for the wear of the movable contact block, until the movable contact block reaches the rotation path of the conductive rolling contact.
[0033] The technical effects achieved by this invention are as follows:
[0034] This invention features a rotary closed structure that rotates to a designated tap to connect coils with different numbers of turns, achieving voltage regulation. The rotary closed structure is supported by elastic structures in two directions, which, while eliminating redundant feed, adaptively compensates for wear, prevents poor contact or control failure, and improves the reliability of the voltage regulation process.
[0035] This invention provides vertical support force when the rotary closed structure performs its operation, preventing it from tilting vertically and ensuring that the rotary closed structure remains at the same horizontal level during voltage regulation, facilitating smooth subsequent contact or separation.
[0036] In this invention, since the distance between two adjacent movable contacts is less than the distance between two adjacent conductive rolling contacts, and the length of the movable contact is less than the distance between two adjacent conductive rolling contacts, when one conductive rolling contact spans two movable contacts, the other conductive rolling contact remains electrically connected to the movable contacts, so that the coil is continuously in working state, thereby improving the continuity of on-load tap changer. Attached Figure Description
[0037] Figure 1 This is a schematic diagram of the structure of an adaptive compensation control device for on-load tap changing of a transformer according to Embodiment 1 of the present invention;
[0038] Figure 2 This is a cross-sectional view of an adaptive compensation control device for on-load tap changing of a transformer according to Embodiment 1 of the present invention;
[0039] Figure 3 This is a partial structural schematic diagram of an adaptive compensation control device for on-load tap changing of a transformer according to Embodiment 1 of the present invention;
[0040] Figure 4 This is a perspective view of the distribution box in Embodiment 1 of the present invention;
[0041] Figure 5This is an exploded view of the contact state between the movable contact and the conductive rolling contact in Embodiment 1 of the present invention;
[0042] Figure 6 This is the invention Figure 5 Schematic diagram of the structure of the first elastic element;
[0043] Figure 7 This is the invention Figure 5 Schematic diagram of the structure of the folded plate;
[0044] Figure 8 This is the invention Figure 5 Schematic diagram of the structure of the medium-conducting rolling contact;
[0045] Figure 9 This is the invention Figure 5 Schematic diagram of the third flange in the middle;
[0046] Figure 10 This is the invention Figure 5 A schematic diagram of the middle hinge structure;
[0047] Figure 11 This is the invention Figure 5 Schematic diagram of the structure of the second elastic element;
[0048] Figure 12 This is the invention Figure 5 Schematic diagram of the structure of the middle lead sheet;
[0049] Figure 13 This is the invention Figure 5 Schematic diagram of the fourth flange in the middle;
[0050] Figure 14 This is the invention Figure 5 Schematic diagram of the structure of the terminal block;
[0051] Figure 15 This is a flowchart of an adaptive compensation control method for on-load tap changing of a transformer according to Embodiment 2 of the present invention.
[0052] The attached diagram lists the components represented by each number as follows:
[0053] 1. Transformer body; 2. Iron core; 3. Coil; 4. Insulator; 5. Distribution box; 6. Motor; 7. Controller; 8. First rotating shaft; 9. Right-angle transmission coupling; 10. First flange; 11. First conductive fork; 12. Second rotating shaft; 13. First elastic element; 14. Second flange; 15. Bending plate; 16. Conductive rolling contact; 17. Third flange; 18. Hinge; 19. Second elastic element; 20. Third elastic element; 21. Movable contact block; 22. Slide groove; 23. Guide boss; 24. Lead wire; 25. Second conductive fork; 26. Fourth flange; 27. Terminal block; 28. Terminal head; 29. Oil injection valve. Detailed Implementation
[0054] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.
[0055] Example 1:
[0056] like Figures 1-14 As shown, an adaptive compensation control device for on-load tap changing of a transformer includes a transformer body 1, an iron core 2, a coil 3, an insulator 4, a distribution box 5, a motor 6, and a controller 7. The iron core 2 is fixed inside the transformer body 1 by bolts, and the coil 3 is wound and installed on the iron core 2. The insulator 4 is fixed to the top of the transformer body 1 by screws. The distribution box 5 is fixed to the outside of the transformer body 1 by bolts. The motor 6 and the controller 7 are both fixed inside the distribution box 5 by bolts. The motor 6 is electrically connected to the controller 7, and the controller 7 can start the motor 6 under the control of a preset program.
[0057] The transformer body 1 is provided with a first conductive fork 11, a first elastic element 13 and a conductive rolling contact 16 connected vertically in sequence, as well as a plurality of movable contact blocks 21. The movable contact blocks 21 are provided with a second elastic element 19, a third elastic element 20 and a terminal block 27 connected to the high-voltage side coil 3 at intervals on the outside. The conductive rolling contact 16 is electrically connected to the high-voltage side coil 3 through a wire.
[0058] When the transformer body 1 is working, the staff can communicate remotely through the 5G communication module adapted to the controller 7, start the motor 6, the motor 6 provides rotational force, the first conductive fork 11 drives the conductive rolling contact 16 to rotate and contact the movable contact block 21 connected to the coil 3 with a specified number of turns, so as to realize the tap connection circuit of the high voltage side coil 3 with different number of turns, thereby regulating the voltage under load.
[0059] There is a certain degree of friction between the conductive rolling contact 16 and the movable contact 21. When the conductive rolling contact 16 and the movable contact 21 experience wear, the first elastic element 13, the second elastic element 19 and the third elastic element 20 push the conductive rolling contact 16 and the movable contact 21 under the action of their own elastic potential energy to compensate for the wear.
[0060] As an optional embodiment, the high-voltage side coil 3 is provided with multiple taps at intervals. The taps are connected to the terminal block 27 by wires. When different taps are electrically connected, different sections of the high-voltage side coil 3 enter the load state to realize voltage regulation.
[0061] It should be noted that the controller 7 sends a specified number and frequency of pulse signals to the motor 6. Each pulse corresponds to a fixed basic step angle, and the total number of pulses directly determines the target angle. When the motor 6 is running, the encoder monitors the actual position of the rotor in real time and feeds the signal back to the controller 7 for real-time comparison with the command value. If an angle deviation occurs, the controller 7 automatically adjusts the current, voltage, or pulse output and performs dynamic compensation through algorithms such as PID until the actual position accurately reaches the command position, thus achieving precise angle positioning.
[0062] Meanwhile, the bottom of the transformer body 1 is connected to an oil injection valve 29 via a connector. After installation, the oil injection valve 29 is opened and sufficient oil is injected into the transformer body 1 along the oil injection valve 29. Then the oil injection valve 29 is closed, and the iron core 2, coil 3, first conductive fork 11, first elastic element 13, conductive rolling contact 16, movable contact block 21, second elastic element 19, third elastic element 20, and terminal block 27 are all immersed in the oil.
[0063] See attached document Figure 2 , Figure 3 and Figure 4 The transformer body 1 has three first rotating shafts 8 spaced apart on its exterior. A right-angle transmission coupling 9 connects two adjacent first rotating shafts 8. One first rotating shaft 8 extends into the transformer body 1 and connects to the first conductive fork 11. Multiple movable contacts 21 surround the first rotating shaft 8. Another first rotating shaft 8 extends into the distribution box 5 and connects to the output end of the motor 6 via a coupling. Both the transformer body 1 and the distribution box 5 support the first rotating shafts 8 through sealed bearings. When the motor 6 starts, it transmits power to the first conductive fork 11 along the three first rotating shafts 8.
[0064] Since the distance between two adjacent movable contacts 21 is less than the distance between two adjacent conductive rolling contacts 16, and the length of the movable contact 21 is less than the distance between the two adjacent conductive rolling contacts 16, when one conductive rolling contact 16 spans two movable contacts 21, the other conductive rolling contact 16 remains electrically connected to the movable contact 21, so that the coil 3 is continuously in working state, improving the continuity of on-load tap changer.
[0065] As an optional embodiment, a resistor is welded onto the first conductive fork 11. The resistor is used to bear the interstage voltage at the moment of switching, so as to achieve seamless switching of first connecting and then disconnecting, thereby ensuring a smooth change of voltage under load. The motor 6 can be a three-phase asynchronous motor, and the controller 7 can be a Mitsubishi microcontroller.
[0066] See attached document Figure 2 , Figure 4 and Figure 5 The transformer body 1 is also provided with a first flange 10 connected to the first rotating shaft 8. The first conductive fork 11 is connected to the bottom of the first rotating shaft 8 through the first flange 10. The first conductive fork 11 is fixed with a second rotating shaft 12 that supports the conductive rolling contact 16 through a bearing by two nuts. When the conductive rolling contact 16 is subjected to tangential friction, it rotates around the second rotating shaft 12. Since the first flange 10 is made of insulating material, the current of the first conductive fork 11 is prevented from being conducted to the second rotating shaft 12.
[0067] The first elastic element 13 and the conductive rolling contact 16 are both sleeved on the outside of the second rotating shaft 12. When the conductive rolling contact 16 is worn, the first elastic element 13 provides a compressive force along the axial direction of the second rotating shaft 12. The conductive rolling contact 16 is restricted to the bottom of the second rotating shaft 12 by the compressive force, so that the conductive rolling contact 16 is always facing the movable contact 21, preventing the conductive rolling contact 16 from failing to conduct electricity to the movable contact 21.
[0068] As an optional embodiment, the first elastic element 13 can be a plastic spring, which can store elastic potential energy and has insulating properties to prevent current conduction. The bottom of the conductive rolling contact 16 can be connected to a wire through a rotary joint, and the wire can be connected to the tap of the high-voltage side coil 3, so that the end of the wire has a certain degree of freedom and to prevent the wire from being twisted off when the conductive rolling contact 16 rotates.
[0069] See attached document Figure 4 , Figure 5 and Figure 11The first conductive fork 11 is bent and open, and both ends of the bent and open are rotatably connected to the conductive rolling contact 16 through the second rotating shaft 12. The movable contact block 21 is fan-shaped with arc surfaces at both ends, so that when the first conductive fork 11 rotates under the power of the motor 6, it drives the second rotating shaft 12 and the conductive rolling contact 16 to rotate around a first rotating shaft 8.
[0070] When the conductive rolling contact 16 rotates, at least one conductive rolling contact 16 contacts the movable contact block 21 along the arc surface until the second elastic member 19 and the third elastic member 20 are compressed. The movable contact block 21 provides sufficient movement space for the conductive rolling contact 16 to avoid interference between the conductive rolling contact 16 and the movable contact block 21.
[0071] Meanwhile, the second elastic element 19 and the third elastic element 20 accumulate elastic potential energy. When the conductive rolling contact 16 leaves the movable contact 21, the second elastic element 19 and the third elastic element 20 release elastic potential energy to push the movable contact 21 to reset, thereby compensating for the wear of the movable contact 21, until the movable contact 21 reaches the rotation path of the conductive rolling contact 16, which is used to ensure that the movable contact 21 and the conductive rolling contact 16 make accurate contact during voltage regulation.
[0072] See attached document Figure 5 , Figure 6 and Figure 7 The first elastic element 13, away from the first conductive fork 11, is sequentially welded with a second flange 14 and multiple folded plates 15 along the second rotating shaft 12. During operation, the first elastic element 13 pushes the folded plates 15 to contact the conductive rolling contact 16 under its own elastic potential energy, so that the first elastic element 13 and the conductive rolling contact 16 are separated, avoiding friction between the conductive rolling contact 16 and the first elastic element 13. The first conductive fork 11 is electrically connected to the conductive rolling contact 16 through the second rotating shaft 12 and the folded plates 15, realizing the electrical connection between the two taps on the high-voltage side coil 3.
[0073] When the folded plate 15 rubs against the conductive rolling contact 16, the total length of the folded plate 15 decreases due to wear, while the first elastic member 13 continuously pushes the folded plate 15 to contact the conductive rolling contact 16, thereby improving the continuity of the electrical connection between the conductive rolling contact 16 and the first conductive fork 11.
[0074] See attached document Figure 5 , Figure 10 and Figure 11Inside the transformer body 1, eight third flanges 17 and hinges 18 are fixed by screws. The second elastic element 19 is welded in a ring between the third flange 17 and the movable contact 21. Both ends of the third elastic element 20 are bonded to the inner side of the second elastic element 19. When the conductive rolling contact 16 presses the movable contact 21, the movable contact 21 presses the second elastic element 19 and the third elastic element 20, so that the second elastic element 19 and the third elastic element 20 accumulate elastic potential energy.
[0075] Meanwhile, the third flange 17 is connected to the adjacent movable contact 21 via hinge 18, see [link / reference] Figure 10 The hinge 18 swings laterally and can be used to vertically limit the movable contact block 21;
[0076] When the second elastic element 19 and the third elastic element 20 are compressed, they generate elastic potential energy. When the conductive rolling contact 16 leaves the movable contact block 21, the movable contact block 21 reduces the distance between itself and the conductive rolling contact 16 under the action of elastic potential energy. This compensates for the wear of the conductive rolling contact 16 and the movable contact block 21, so that after the conductive rolling contact 16 rotates to a specified angle, it can contact the movable contact block 21, preventing contact failure due to wear and improving the stability of voltage regulation.
[0077] As an optional embodiment, the second elastic element 19 may be milled from a shape memory alloy, see [reference]. Figure 11 Three rows of second elastic elements 19 are provided between each third flange 17 and the movable contact 21. The radii of the three second elastic elements 19 in each row decrease sequentially to fit the spacing between the movable contact 21 and the movable contact 21. The third elastic element 20 is an air bag filled with inert gas. The second elastic elements 19 and the third elastic elements 20 support the movable contact 21 at multiple points to provide a preset level of elastic potential energy.
[0078] See attached document Figure 2 , Figure 5 and Figure 8 The movable contact 21 has a groove 22, and the outer side of the conductive rolling contact 16 is integrally provided with a guide boss 23 that matches the groove 22. When the conductive rolling contact 16 presses the movable contact 21, the guide boss 23 enters the groove 22. Due to the limiting effect of the first elastic member 13, the conductive rolling contact 16 and the guide boss 23 provide vertical support force for the groove 22, so that the conductive rolling contact 16 vertically straightens the movable contact 21 through the guide boss 23, preventing the movable contact 21 from tilting vertically, and ensuring that the conductive rolling contact 16 and the movable contact 21 are always at the same horizontal height during the voltage regulation process, which facilitates smooth contact or separation between the two in the future.
[0079] See attached document Figure 8 , Figure 12 and Figure 13A lead sheet 24 is connected between the movable contact 21 and the adjacent terminal block 27 to realize the electrical connection between the movable contact 21 and the tap. The top of the terminal block 27 is welded with a second conductive fork 25 and a fourth flange 26 in sequence along its radial direction. The terminal block 27 is fixed to the inside of the transformer body 1 by bolts through the fourth flange 26. Since the fourth flange 26 is made of high temperature resistant plastic, there are no conductive points between the terminal block 27 and the inner wall of the transformer body 1, which improves the safety of voltage regulation.
[0080] When the conductive rolling contact 16 presses the movable contact 21, the lead sheet 24 has a certain degree of flexibility. The lead sheet 24 is pulled by the movable contact 21 and deforms, so that the movable contact 21 maintains an electrical connection with the coil 3 through the lead sheet 24 and the terminal block 27, preventing the connection between the movable contact 21 and the coil 3 from being broken.
[0081] See attached document Figure 2 , Figure 5 and Figure 14 Multiple terminal blocks 28 are welded at axial intervals on the outer side of the terminal block 27. These terminal blocks 27 are connected to taps at different turns of the coil 3 via the terminal blocks 28 and wires. (See [reference]). Figure 14 Each terminal block 27 is welded with thirteen terminal heads 28 at intervals, which can divide the wire head into thirteen strands, which are fixed to the thirteen terminal heads 28 by bolts. One strand is disconnected, and the remaining wire head remains connected, which improves the safety of the tap electrical connection.
[0082] Example 2:
[0083] like Figure 15 As shown, an adaptive compensation control method for on-load tap changer of a transformer, using the adaptive compensation control device for on-load tap changer of a transformer as provided in Embodiment 1, includes the following steps:
[0084] The motor 6 is started to provide rotational force, which causes the first conductive fork 11 to drive the conductive rolling contact 16 to rotate and contact the movable contact 21 connected to the coil 3 with a specified number of turns. Since the conductive rolling contact 16 and the movable contact 21 form a rotary closed structure, the taps of the high-voltage side coil 3 with different numbers of turns are connected to the circuit, thereby regulating the voltage under load.
[0085] When the conductive rolling contact 16 experiences wear, the first elastic element 13 provides a compressive force along its axial direction. The conductive rolling contact 16 is restricted to a designated position by the compressive force, so that the conductive rolling contact 16 is always facing the movable contact 21, preventing the conductive rolling contact 16 from being misaligned with the movable contact 21 and causing power failure.
[0086] When the folded plate 15 rubs against the conductive rolling contact 16, the total length of the folded plate 15 decreases due to wear, while the first elastic member 13 continuously pushes the folded plate 15 to contact the conductive rolling contact 16, thereby improving the continuity of the electrical connection between the conductive rolling contact 16 and the first conductive fork 11.
[0087] Meanwhile, the second elastic element 19 and the third elastic element 20 accumulate elastic potential energy. When the conductive rolling contact 16 leaves the movable contact 21, the second elastic element 19 and the third elastic element 20 release elastic potential energy to push the movable contact 21 to reset, thereby compensating for the wear of the movable contact 21, until the movable contact 21 reaches the rotation path of the conductive rolling contact 16, which is used to ensure that the movable contact 21 and the conductive rolling contact 16 make accurate contact during voltage regulation.
[0088] The above description is merely an optional embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.
Claims
1. An adaptive compensation control device for on-load tap changer of a transformer, comprising a transformer body (1), a coil (3), and a motor (6), wherein the output terminal of the motor (6) is connected to a transmission assembly, characterized in that, The transformer body (1) is internally equipped with: The first conductive fork (11), the first elastic element (13), and the conductive rolling contact (16) are connected vertically in sequence. Multiple movable contacts (21), wherein a second elastic element (19), a third elastic element (20), and a terminal block (27) connected to the coil (3) are provided at intervals on the outer side of the movable contacts (21); During operation, the motor (6) and transmission assembly provide rotational force, and the first conductive fork (11) drives the conductive rolling contact (16) to rotate and contact the movable contact (21) connected to the coil (3) with a specified number of turns. When the conductive rolling contact (16) and the movable contact (21) experience wear, the first elastic element (13), the second elastic element (19) and the third elastic element (20) push the conductive rolling contact (16) and the movable contact (21) to compensate for the wear.
2. The adaptive compensation control device for on-load tap changer of a transformer according to claim 1, characterized in that: The first conductive fork (11) is bent and open, and both ends of the bent and open are rotatably connected to conductive rolling contacts (16). The movable contact block (21) is fan-shaped with arc surfaces at both ends. When the conductive rolling contact (16) rotates, the conductive rolling contact (16) contacts the movable contact (21) along the arc surface until the second elastic element (19) and the third elastic element (20) are compressed, so as to avoid interference between the conductive rolling contact (16) and the movable contact (21).
3. The adaptive compensation control device for on-load tap changer of a transformer according to claim 1, characterized in that: The transmission assembly includes three first rotating shafts (8), two adjacent first rotating shafts (8) are connected by a right-angle transmission coupling (9), one of the first rotating shafts (8) extends into the transformer body (1) and is connected to the first conductive fork (11), and a plurality of the movable contacts (21) surround the first rotating shafts (8). Among them, the distance between two adjacent movable contacts (21) is less than the distance between two adjacent conductive rolling contacts (16), and the length of the movable contact (21) is less than the distance between two adjacent conductive rolling contacts (16). When one of the conductive rolling contacts (16) spans two movable contacts (21), the other conductive rolling contact (16) remains electrically connected to the movable contact (21), thereby improving the continuity of on-load tap changer.
4. The adaptive compensation control device for on-load tap changing of a transformer according to claim 1, characterized in that: The transformer body (1) is also provided with a first flange (10) connected to the transmission assembly. The first conductive fork (11) is connected to the transmission assembly through the first flange (10). A second rotating shaft (12) for supporting the conductive rolling contact (16) is fixed on the first conductive fork (11). The first elastic element (13) and the conductive rolling contact (16) are both sleeved on the outside of the second rotating shaft (12). When the conductive rolling contact (16) is worn, the first elastic element (13) provides a squeezing force along the axial direction of the second rotating shaft (12), so that the conductive rolling contact (16) is continuously facing the movable contact block (21).
5. The adaptive compensation control device for on-load tap changing of a transformer according to claim 4, characterized in that: The first elastic element (13) is welded with a second flange (14) and a plurality of folded plates (15) in sequence along the second rotation axis (12) at the end away from the first conductive fork (11). During operation, the first elastic element (13) pushes the folded plate (15) to contact the conductive rolling contact (16), thus preventing the conductive rolling contact (16) from rubbing against the first elastic element (13), and the first conductive fork (11) is electrically connected to the conductive rolling contact (16) through the second rotating shaft (12) and the folded plate (15).
6. The adaptive compensation control device for on-load tap changing of a transformer according to claim 1, characterized in that: The transformer body (1) is also provided with multiple third flanges (17) and hinges (18). The second elastic element (19) is welded in a ring shape between the third flange (17) and the movable contact (21). The two ends of the third elastic element (20) are fixed to the inside of the second elastic element (19). Meanwhile, the third flange (17) is connected to the adjacent movable contact (21) via a hinge (18), which is used to vertically limit the movable contact (21). When the second elastic element (19) and the third elastic element (20) are compressed, they generate elastic potential energy. When the conductive rolling contact (16) leaves the movable contact (21), the movable contact (21) reduces its distance from the conductive rolling contact (16) under the action of elastic potential energy, thereby compensating for the wear of the conductive rolling contact (16) and the movable contact (21).
7. The adaptive compensation control device for on-load tap changing of a transformer according to claim 1, characterized in that: The movable contact block (21) is provided with a sliding groove (22), and the conductive rolling contact (16) is integrally provided with a guide boss (23) that is adapted to the sliding groove (22) on the outside. When the conductive rolling contact (16) presses against the movable contact (21), the guide boss (23) enters the groove (22), so that the conductive rolling contact (16) vertically straightens the movable contact (21) through the guide boss (23) to prevent the movable contact (21) from tilting vertically.
8. The adaptive compensation control device for on-load tap changing of a transformer according to claim 1, characterized in that: A lead sheet (24) is connected between the movable contact (21) and the adjacent terminal block (27). A second conductive fork (25) and a fourth flange (26) are connected in sequence along the radial direction on the top of the terminal block (27). The fourth flange (26) is fixed inside the transformer body (1). When the conductive rolling contact (16) presses against the movable contact (21), the lead sheet (24) is pulled by the movable contact (21) and deformed, so that the movable contact (21) is electrically connected to the coil (3) through the lead sheet (24) and the terminal block (27).
9. The adaptive compensation control device for on-load tap changing of a transformer according to claim 1, characterized in that: Multiple terminal blocks (28) are welded at intervals along the axial direction on the outer side of the terminal block (27), and the multiple terminal blocks (27) are connected to the positions of different numbers of turns of the coil (3) through the terminal blocks (28).
10. An adaptive compensation control method for on-load tap changer of a transformer, using the adaptive compensation control device for on-load tap changer of a transformer as described in any one of claims 1-9, characterized in that, Includes the following steps: The starting motor (6) provides rotational force, causing the first conductive fork (11) to drive the conductive rolling contact (16) to rotate and contact the movable contact (21) connected to the coil (3) with a specified number of turns, so that the taps of the high-voltage side coil (3) with different numbers of turns are connected to the circuit, thereby realizing voltage regulation under load. When the conductive rolling contact (16) experiences wear, the first elastic element (13) provides a compressive force along its axial direction. The conductive rolling contact (16) is restricted to a specified position by the compressive force, so that the conductive rolling contact (16) is continuously facing the movable contact (21), preventing the conductive rolling contact (16) from being misaligned with the movable contact (21). The second elastic element (19) and the third elastic element (20) accumulate elastic potential energy. When the conductive rolling contact (16) leaves the movable contact (21), the second elastic element (19) and the third elastic element (20) release elastic potential energy to push the movable contact (21) to reset, thereby compensating for the wear of the movable contact (21) until the movable contact (21) reaches the rotation path of the conductive rolling contact (16).