Transformer on-load tap-changer
By using the coordination of the main component and the conversion component in the on-load tap-off switch of the transformer, the damage and arc problems caused by direct contact switching are avoided, the problems of mechanical wear and electrical corrosion in the prior art are solved, and the stability of the transformer is improved Sex and service life.
Patent Information
- Application Number
- CN202410863673.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-29
- Publication Date
- 2024-12-24
AI Technical Summary
The existing transformer on-load tap-off switches regulate the voltage through the contact rod, resulting in serious mechanical wear, electrical corrosion and pollution. Especially when the load current is large, the elasticity becomes weak, the contact pressure is reduced, and the contact resistance is increased, resulting in Heat and oxidation corrosion form a vicious cycle and damage the switching switch.
Using the cooperation of the main component and the conversion component, the switching of the contacts is changed into multiple joints through the design of the drive, rotating, follower and transition parts to avoid damage and arcing problems caused by direct contact switching. , and avoid damage to switch structures by optimizing the structure.
It effectively avoids contact damage and arcing, extends the service life of the transformer, improves the reliability of the switching structure, reduces heat generation, and avoids the reduction in switching efficiency caused by weak spring elasticity.
Smart Images
Figure CN119181605A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of transformer technology, and in particular to an on-load tap changer for transformers. Background Technology
[0002] Voltage is a crucial quality indicator in the power grid. Excessively high or low voltage can damage or even malfunction equipment. Poor voltage quality can lead to problems such as voltage drops, harmonics, and voltage flicker, significantly impacting the power experience for end users. Therefore, stable line-end voltage is essential for ensuring the reliability of equipment operation. To mitigate these impacts, transformer tap changers are used to regulate the grid voltage in real time, ensuring voltage stability at the user end.
[0003] Existing on-load tap changers for transformers typically use contact rods for voltage regulation. Frequent voltage adjustments lead to severe mechanical wear, electrolytic corrosion, and contact contamination between the contacts. This is especially true for transformers with high load currents, where the thermal effect of the current weakens the spring's elasticity, reduces the contact pressure between the moving and stationary contacts, and increases contact resistance, further increasing heat generation between the contacts. This heat accelerates oxidation, corrosion, and mechanical deformation of the contact surfaces, creating a vicious cycle that ultimately damages the tap changer. Summary of the Invention
[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.
[0005] In view of the problems existing in the above and / or existing transformer on-load tap changers, the present invention is proposed.
[0006] Therefore, the problem this invention aims to solve is that existing on-load tap changers for transformers typically use contact rods for voltage regulation. Frequent voltage regulation leads to severe mechanical wear, electro-corrosion, and contact contamination between the contacts. This is especially true for transformers with high load currents, where the thermal effect of the current weakens the spring's elasticity, reduces the contact pressure between the moving and stationary contacts, increases contact resistance, and further increases heat generation between the contacts. This heat generation accelerates oxidation corrosion and mechanical deformation of the contact surface, creating a vicious cycle that ultimately damages the tap changer.
[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a transformer on-load tap changer, comprising a main body assembly including a cylinder, a support frame and a main circuit shaft, wherein the support frame is disposed outside the cylinder and the main circuit shaft is disposed inside the cylinder;
[0008] The conversion assembly includes a driving component, a rotating component, a follower component, and a transition component. The driving component is disposed on the support frame, the rotating component is movably connected to the support frame, the follower component cooperates with the rotating component, and the transition component is disposed on the cylinder and cooperates with the follower component.
[0009] In a preferred embodiment of the on-load tap changer for transformers according to the present invention, the driving component includes a motor, a rotating gear, and a track gear. The track gear is disposed on the support frame, and the motor is fixedly connected to the rotating gear and meshes with the track gear.
[0010] In a preferred embodiment of the transformer on-load tap changer of the present invention, the rotating component includes a connecting rod and a rotating ring, the connecting rod is movably connected to the rotating gear and the rotating ring, and the rotating ring moves within a track groove formed on the support frame.
[0011] As a preferred embodiment of the on-load tap changer of the transformer described in this invention, the rotating ring is provided with a main line switching slot and a transition line switching slot, the main line switching slot cooperates with the follower, and the transition line switching slot cooperates with the follower.
[0012] In a preferred embodiment of the on-load tap changer of the transformer according to the present invention, the following component includes a fixed terminal, a following terminal and a following ring. The fixed terminal is fixedly disposed on the cylinder and electrically connected to the main circuit shaft. The following ring is movably connected to the following terminal and cooperates with the rotating ring through a following rod fixedly connected to the following ring.
[0013] As a preferred embodiment of the on-load tap changer of the transformer described in this invention, a limiting groove is provided on the fixed terminal, and a limiting ball is provided in the limiting groove. The limiting ball cooperates with the trapezoidal groove provided on the follower terminal, and the limiting ball cooperates with the follower ring.
[0014] As a preferred embodiment of the on-load tap changer of the transformer described in this invention, a buffer groove is further provided on the follower terminal, and the buffer groove cooperates with the gripping block provided on the follower ring.
[0015] In a preferred embodiment of the on-load tap changer for transformers according to the present invention, the portion of the follower ring away from the gripping block is a thin-walled ring, the thickness of the thin-walled ring is less than the thickness of the follower ring, and the thin-walled ring cooperates with the limiting ball.
[0016] As a preferred embodiment of the on-load tap changer of the transformer according to the present invention, wherein: a push groove is provided in the main line switching slot, the push groove is smoothly connected to the main line switching slot, the distance of the push groove from the center of the ring is less than the distance of the main line switching slot from the center of the ring; a tension groove is provided in the transition line switching slot, the tension groove is smoothly connected to the transition line switching slot, and the distance of the tension groove from the center of the ring is greater than the distance of the transition line switching slot from the center of the ring; and the number of tension grooves corresponds to the number of follower members.
[0017] In a preferred embodiment of the on-load tap changer for transformers according to the present invention, the transition element includes a transition resistor, which cooperates with the rotating element through a single set of follower elements.
[0018] The beneficial effects of this invention are as follows: by cooperating with the main component and the conversion component, the existing contact rotation switching is transformed into the form of multiple joints, avoiding contact damage caused by contact switching and avoiding the problem of arcing that is easy to generate during contact switching. Furthermore, the switching structure of this invention avoids the problem that the transformer is affected when the switching structure is damaged due to direct connection of the existing on-load switch switching structure. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:
[0020] Figure 1 This is a schematic diagram of the overall structure of an on-load tap changer for a transformer.
[0021] Figure 2 This is a schematic cross-sectional view of the overall structure of the on-load tap changer for a transformer.
[0022] Figure 3 This is a cross-sectional schematic diagram of the conversion component.
[0023] Figure 4 This is an enlarged cross-sectional schematic diagram of a portion of the conversion component structure.
[0024] Figure 5 This is a schematic diagram of the rotating ring structure.
[0025] Figure 6 This is a schematic diagram of the main circuit switching groove structure of the rotating ring.
[0026] Figure 7 This is a schematic diagram of the transition line switching groove structure for the rotating ring.
[0027] Figure 8 This is a schematic diagram of a gear shifting circuit. Detailed Implementation
[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.
[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.
[0031] Example 1
[0032] Reference Figures 1-3 and Figure 6 This is the first embodiment of the present invention, which provides a transformer on-load tap changer, which includes a main body assembly 100 and a switching assembly 200.
[0033] Specifically, the main component 100 includes a cylinder 101, a support frame 102, and a main circuit shaft 103. The support frame 102 is located outside the cylinder 101, and the main circuit shaft 103 is located inside the cylinder 101.
[0034] The cylinder 101 is used to house the tap changer circuit and the transition resistor 204a and to support the support frame 102. The support frame 102 is used to support the switching component 200 of the tap changer. The main circuit shaft 103 is used to connect the transformer circuit.
[0035] Specifically, the adjustment component 200 includes a driving component 201, a rotating component 202, a follower component 203, and a transition component 204. The driving component 201 is mounted on the support frame 102 and includes a motor 201a, a rotating gear 201b, and a track gear 201c. The track gear 201c is mounted on the support frame 102. The motor 201a is fixedly connected to the rotating gear 201b and meshes with the track gear 201c to realize the rotational movement of the conversion component 200. The rotating component 202 is movably connected to the support frame 102 and includes a connecting rod 202a and a rotating ring 202b. The connecting rod 202a movably connects the rotating gear 201b and the rotating ring 202b. b, used to rotate the gear 201b around the cylinder 101 in a circular motion, the rotating ring 202b moves in the track groove 102a opened on the support frame 102; the follower 203 cooperates with the rotating member 202, the follower 203 includes a fixed terminal 203a, a follower terminal 203b and a follower ring 203c, the fixed terminal 203a is fixedly set on the cylinder 101 and electrically connected to the main circuit shaft 103, the follower ring 203c is movably connected to the follower terminal 203b and cooperates with the rotating ring 202b through the follower rod 203c-1 fixedly connected to the follower ring 203c, the follower terminal 203b is electrically connected to the main circuit shaft 103 through a wire.
[0036] Furthermore, a main line switching groove 202b-1 is provided on the rotating ring 202b. The main line switching groove 202b-1 cooperates with the follower rod 203c-1 of the follower 203. The follower rod 203c-1 slides in the main line switching groove 202b-1 and can drive the follower ring 203c to move along with the main line switching groove 202b-1. A push groove 202b-1a is provided in the main line switching groove 202b-1. The push groove 202b-1a is smoothly connected to the main line switching groove 202b-1. The distance of the push groove 202b-1a from the center of the ring is less than the distance of the main line switching groove 202b-1 from the center of the ring. Therefore, when it moves to the push groove 202b-1a, the follower rod 203c-1 will move along the push groove 202b-1a and approach the center of the ring, thereby driving the follower ring 203c to move towards the center of the ring.
[0037] In use, motor 201a drives rotating gear 201b to rotate. Because track teeth 201c are fixed, rotating gear 201b moves in a circle around cylinder 101 along track teeth 201c. This causes connecting rod 202a, which is movably connected to rotating gear 201b, to move in a circle around cylinder 101. This, in turn, causes rotating ring 202b, which is fixedly connected to connecting rod 202a, to rotate. This causes follower rod 203c-1 to move along main line switching groove 202b-1. When it reaches the position of push groove 202b-1a, it gradually moves closer to the center of the ring, causing follower ring 203c to move towards the center of the ring. The follower ring 203c can then pull follower terminal 203b towards fixed terminal 203a, completing its internal electrical connection.
[0038] Example 2
[0039] Reference Figures 1-4 and Figure 6 This is the second embodiment of the present invention, which further optimizes the follower 203 based on the previous embodiment.
[0040] Specifically, a limiting groove 203a-1 is provided on the fixed wiring port 203a, and a limiting ball 203a-2 is provided in the limiting groove 203a-1. The limiting ball 203a-2 cooperates with the trapezoidal groove 203b-1 provided on the follower wiring terminal 203b. When the limiting groove 203a-1 is not blocked, the limiting ball 203a-2 can be squeezed out of the trapezoidal groove 203b-1 through the inclined structure of the trapezoidal groove 203b-1. The limiting ball 203a-2 cooperates with the follower ring 203c.
[0041] Furthermore, a buffer groove 203b-2 is also provided on the follower terminal 203b. The buffer groove 203b-2 cooperates with the gripping block 203c-2 provided on the follower ring 203c. The gripping block 203c-2 slides in the buffer groove 203b-2 and can drive the follower terminal 203b to move by abutting against the two ends of the buffer groove 203b.
[0042] Furthermore, the section of the follower ring 203c away from the gripping block 203c-2 is a thin-walled ring 203c-3. The thickness of the thin-walled ring 203c-3 is less than the thickness of the follower ring 203c. The thin-walled ring 203c-3 cooperates with the limiting ball 203a-2. When the thin-walled ring 203c-3 is located above the limiting groove 203a-1, the movement space generated by the thickness difference between the thin-walled ring 203c-3 and the follower ring 203c allows the limiting ball 203a-2 to be squeezed out.
[0043] During the electrical connection process, as the follower ring 203c moves towards or away from the center of the ring along with the follower rod 203c-1, it moves within the buffer groove 203b-2. This prevents the follower terminal 203b from immediately engaging with the fixed terminal 203a to complete the electrical connection. This avoids potential damage to the main circuit caused by directly switching the electrical connection before the transition resistor 204a is connected. When the follower ring 203c contacts the edge of the buffer groove 203b-2, it moves the follower terminal 203b, simultaneously moving the thin-walled ring 203c-3 on the follower ring 203c. The space above the limiting groove 203a-1 is gradually removed, and the thin-walled ring 203c-3, through the inner wall of the follower ring 203c, compresses the limiting ball 203a-2 into the limiting groove 203a-1 and into the trapezoidal groove 203b-1. At this time, without moving the follower ring 203c, the limiting ball 203a-2 is restricted in the trapezoidal groove 203b-1, which can fix the follower terminal 203b and ensure the stability of the electrical connection. During the process of disconnecting the electrical connection, similarly, after the follower ring 203c travels a certain distance, it contacts the other end of the buffer groove 203b-2. During this process, the space above the limiting groove 203a-1 gradually changes from the inner wall of the follower ring 203c to the empty space of the thin-walled ring 203c-3. Then, the follower ring 203c drives the follower terminal 203b to move. The inclined structure of the trapezoidal groove 203b-1 on the follower terminal 203b can squeeze the limiting ball 203a-2 into the limiting groove 203a-1 and release the limiting ball 203a-2 from the limit of the follower terminal 203b, so that the follower terminal 203b can be separated from the fixed terminal 203a, and the electrical separation is completed.
[0044] Example 3
[0045] Reference Figures 1 to 8 This is the third embodiment of the present invention, which is based on the first two embodiments and further optimizes the rotating ring 202b.
[0046] Specifically, the rotating ring 202b is also provided with a transition line switching groove 202b-2. A tension groove 202b-2a is provided in the transition line switching groove 202b-2. The tension groove 202b-2a is smoothly connected to the transition line switching groove 202b-2. The distance between the tension groove 202b-2a and the center of the ring is greater than the distance between the transition line switching groove 202b-2 and the center of the ring. This causes the follower rod 203c-1 moving in the tension groove 202b-2a to gradually move away from the center of the ring. The number of tension grooves 202b-2a corresponds to the number of follower rods 203.
[0047] Furthermore, the transition member 204 includes a transition resistor 204a, which cooperates with the rotating member 202 through a single set of follower members 203.
[0048] In use, motor 201a drives rotating gear 201b to rotate. Because track teeth 201c are fixed, rotating gear 201b moves in a circle around cylinder 101 along track teeth 201c. This causes connecting rod 202a, which is movably connected to rotating gear 201b, to move in a circle around cylinder 101. This, in turn, causes rotating ring 202b, which is fixedly connected to connecting rod 202a, to rotate. This causes follower rod 203c-1 of follower ring 203c on fixed terminal 203a, which is connected to transition resistor 204a, to move along transition line switching groove 202b-2. When it reaches the position of stretching groove 202b-2a, it gradually moves away from the ring center, causing follower ring 203c to move away from the ring center. As a result, follower ring 203c can pull follower terminal 203b away from fixed terminal 203a, completing the internal electrical separation.
[0049] Preferably, the number of stretching grooves 202b-2a corresponds to the number of follower members 203, that is, the number of stretching grooves 202b-2a is consistent with the number of gears, so as to meet the requirements of transition resistor 204a each time the gear is switched.
[0050] Preferably, the position of the stretching groove 202b-2a should correspond to the position of the fixed wiring port 203a, so as to achieve the purpose of disconnecting the transition resistor 204a after the switching is completed, thereby increasing the efficiency of the electrical connection and reducing unnecessary heat generated by the transition resistor 204a in the circuit.
[0051] When using it, the complete switching process should be as follows:
[0052] S1. Drive the rotating component 202 to rotate via the driving component 201;
[0053] S2. The rotating component 202 rotates to drive the follower component 203 connected to the main circuit shaft 103 to rotate, and the follower rod 203c-1 in the first gear position moves out of the push groove 202b-1a so that the follower terminal 203b moves away from the fixed terminal 203a and completes the internal electrical separation, so that the first gear is disconnected.
[0054] S3. Simultaneously, the rotating component 202 rotates to drive the follower component 203 connected to the main circuit shaft 103 to rotate and move the follower rod 203c-1 out of the stretching groove 202b-2a so that the follower terminal 203b is close to the fixed terminal 203a and completes its internal electrical connection, and connects the transition resistor 204a to the circuit.
[0055] S4. Continue to rotate the rotating part 202 to drive the follower rod 203c-1 of the second gear position into the propulsion groove 202b-1a, complete the electrical connection, and connect to the second gear. At the same time, the follower rod 203c-1 on the transition part 204 enters the stretching groove 202b-2a to complete the disengagement of the transition resistor 204a.
[0056] In summary, this solution, through the cooperation of the main component 100 and the switching component 200, transforms the existing contact rotary switching into a multi-connector form, avoiding contact damage caused by contact switching and preventing the problem of arcing that easily occurs during contact switching. Furthermore, the switching structure of this invention avoids the problem of transformer operation being affected when the switching structure is damaged, which is a problem with the direct connection of the existing on-load tap changer switching structure. Moreover, by eliminating the use of springs for reset motion, it effectively avoids the vicious cycle caused by the thermal effect of current weakening the spring's elasticity and reducing switching efficiency, and the increased resistance and heat caused by the weakening of elasticity and reduced contact pressure in existing spring-contact tap changers, thus affecting the switching structure itself.
[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A transformer on-load tap changer, characterized in that: include, A main body component (100) comprises a cylinder (101), a support frame (102) and a main circuit shaft (103), wherein the support frame (102) is arranged outside the cylinder (101), and the main circuit shaft (103) is arranged inside the cylinder (101); The conversion assembly (200) comprises a driving member (201), a rotating member (202), a follower (203) and a transition member (204), wherein the driving member (201) is arranged on the support frame (102), the rotating member (202) is movably connected to the support frame (102), the follower (203) cooperates with the rotating member (202), and the transition member (204) is arranged on the cylinder (101) and cooperates with the follower (203).
2. The transformer on-load tap changer according to claim 1, characterized in that: The driving member (201) comprises a motor (201a), a rotating gear (201b) and a track tooth (201c); the track tooth (201c) is arranged on the support frame (102); the motor (201a) is fixedly connected to the rotating gear (201b) and meshes with the track tooth (201c).
3. The transformer on-load tap changer according to claim 2, characterized in that: The rotating member (202) comprises a connecting rod (202a) and a rotating ring (202b), wherein the connecting rod (202a) movably connects the rotating gear (201b) and the rotating ring (202b), and the rotating ring (202b) moves in a track groove (102a) provided on the support frame (102).
4. The transformer on-load tap changer according to claim 3, characterized in that: The rotating ring (202b) is provided with a main line switching slot (202b-1) and a transition line switching slot (202b-2); the main line switching slot (202b-1) cooperates with the follower (203); and the transition line switching slot (202b-2) cooperates with the follower (203).
5. The transformer on-load tap changer according to claim 4, characterized in that: The follower (203) comprises a fixed wiring port (203a), a follower wiring terminal (203b) and a follower ring (203c); the fixed wiring port (203a) is fixedly arranged on the cylinder (101) and electrically connected to the main circuit shaft (103); the follower ring (203c) is movably connected to the follower wiring terminal (203b) and cooperates with the rotating ring (202b) via a follower rod (203c-1) fixedly connected to the follower ring (203c).
6. The transformer on-load tap changer according to claim 5, characterized in that: A limiting groove (203a-1) is provided on the fixed wiring port (203a), and a limiting ball (203a-2) is arranged in the limiting groove (203a-1), the limiting ball (203a-2) cooperates with a trapezoidal groove (203b-1) provided on the follower wiring terminal (203b), and the limiting ball (203a-2) cooperates with the follower ring (203c).
7. The transformer on-load tap changer according to claim 6, characterized in that: The follower terminal (203b) is also provided with a buffer groove (203b-2), and the buffer groove (203b-2) cooperates with a gripping block (203c-2) provided on the follower ring (203c).
8. The transformer on-load tap changer according to claim 7, characterized in that: A section of the follower ring (203c) away from the gripping block (203c-2) is a thin-walled ring (203c-3), the thickness of the thin-walled ring (203c-3) is smaller than the thickness of the follower ring (203c), and the thin-walled ring (203c-3) cooperates with the limiting ball (203a-2).
9. The transformer on-load tap changer according to claim 8, characterized in that: The main line switching groove (202b-1) is provided with a propulsion groove (202b-1a), the propulsion groove (202b-1a) is smoothly connected to the main line switching groove (202b-1), the distance between the propulsion groove (202b-1a) and the ring center is smaller than the distance between the main line switching groove (202b-1) and the ring center; the transition line switching groove (202b-2) is provided with a stretching groove (202b-2a), the stretching groove (202b-2a) is smoothly connected to the transition line switching groove (202b-2), the distance between the stretching groove (202b-2a) and the ring center is larger than the distance between the transition line switching groove (202b-2) and the ring center, and the number of the stretching grooves (202b-2a) corresponds to the number of the followers (203).
10. The transformer on-load tap changer according to claim 9, characterized in that: The transition member (204) comprises a transition resistor (204a), and the transition resistor (204a) cooperates with the rotating member (202) through a single set of the follower member (203).