Moving contact and method for strip-shaped off-circuit tap-changer

Abstract

The moving contact comprises a moving contact body, a moving contact mounting frame and a transmission part, the moving contact body is embedded in an inner cavity of the moving contact mounting frame and elastically connected with the moving contact mounting frame through an elastic part to form a bilaterally symmetrical clamping structure, and the moving contact body is connected between two adjacent gears of static contacts in a floating and bridging mode. According to the invention, the number of pairs of the moving contacts can be increased or decreased according to the magnitude of the current of the tap switch, and all current specifications in practical application can be met.

Description

Technical Field

[0001] This invention belongs to the technical field of transformer tap changers, specifically relating to a moving contact and method for a strip-type non-excitation tap changer. Background Technology

[0002] Strip-type non-excitation tap changers are widely used in transformer voltage regulation due to their simple manufacturing, small size, and low cost. The stationary contacts are spaced apart along the extension direction of a fixed insulating rod, while the moving contacts are slidably mounted on the rod. When voltage adjustment is needed, the moving contact is slid to switch to the corresponding stationary contact. However, due to the limited current-carrying capacity of the moving contacts, they are typically only used in small-capacity power transformers. For example, Chinese patents CN207651360 U and CN201163568 Y disclose a strip-type non-excitation tap changer, in which individual moving contacts are very large, typically allowing a maximum of 2 pairs (4 moving contacts) in parallel, only meeting a 630A current specification. Increasing the number of moving contact pairs to meet higher current specifications not only increases manufacturing difficulty and leads to unreliable moving contact, but also increases the switch size, resulting in a larger transformer size and increased manufacturing costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a moving contact and method for a bar-type non-excitation tap changer, thereby increasing the current carrying capacity of the bar-type non-excitation tap changer by several times and meeting the voltage regulation requirements of medium and large power transformers.

[0004] The embodiments of this application are implemented as follows: This application provides a moving contact for a strip-type non-excitation tap changer, characterized in that it includes a moving contact body, a moving contact mounting bracket, and a transmission component. The moving contact body is embedded in the internal cavity of the moving contact mounting bracket and is elastically connected by an elastic component to form a symmetrical clamping structure, which floats across two adjacent stationary contacts. The moving contact mounting bracket is fixed to the transmission component.

[0005] In some alternative implementations, the moving contact mounting bracket is provided with a U-shaped groove, and the moving contact body is symmetrically disposed on the two side walls of the U-shaped groove and connected to the moving contact mounting bracket by a pin inserted inside.

[0006] In some alternative implementations, the moving contact body is a clip-on moving contact, and multiple clip-on moving contacts are arranged in parallel as a group.

[0007] In some alternative implementations, the sidewall of the mounting cavity is divided into multiple mounting cavities by partitions, and a clip-on moving contact is embedded in the mounting cavity.

[0008] In some alternative implementations, one end of the clip-type moving contact contacts the stationary contact, and the other end of the clip-type moving contact is provided with the elastic element, which is a spring. The two side walls of the U-shaped groove are provided with matching guide grooves corresponding to the positions of the springs. The two ends of the spring are respectively connected to the clip-type moving contact and the guide grooves to abut against each other.

[0009] In some optional embodiments, the clip-type moving contact is provided with an oblong hole, and the moving contact mounting bracket is provided with a corresponding round hole. The pin passes through the oblong hole and the round hole, and the two ends are riveted to fix it.

[0010] In some alternative implementations, the inner end face of the clip-type moving contact has a structure with convex sides and concave center.

[0011] In some alternative implementations, the transmission component is a lead screw, which passes through the moving contact mounting bracket and drives the moving contact mounting bracket to move along the axial direction of the lead screw.

[0012] In some alternative implementations, the transmission component is a gear and rack mechanism, wherein the rack is fixedly connected to the moving contact mounting bracket, and the gear and rack mesh to drive the moving contact mounting bracket to move.

[0013] A method for using a moving contact of a bar-type non-energized tap changer, characterized by comprising the following: The moving contact floats across two adjacent stationary contacts. When the tap changer changes gears, the tap changer's operating mechanism drives the transmission component. The screw rotates, causing the moving contact mounting bracket to move along the screw, or the gear rotates, causing the rack and moving contact mounting bracket to move, thus achieving gear changing.

[0014] The beneficial effects of this application are as follows: The moving contact and method for a bar-type non-excitation tap changer provided by this application adopts a clip-type moving contact and a U-shaped moving contact mounting bracket, which occupies little space, allows multiple pairs of moving contacts to be connected in parallel to achieve a larger current, and can increase or decrease the number of moving contact pairs according to the tap changer current size, which can meet all current specifications in practical applications; the clip-type moving contact is provided with an oblong hole and uses a spring pin floating connection, which facilitates the movement and shifting of the moving contact and maintains a certain shifting feel. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the moving contact in the embodiments of this application; Figure 2 for Figure 1 AA view; Figure 3 This is a schematic diagram of the structure of the strip tap changer in the embodiments of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] It should be understood that the sequence number of each step in the embodiment does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0022] like Figure 1 , Figure 3 As shown in the figure, this embodiment provides a moving contact for a strip-type non-excitation tap changer, including a moving contact body 1, a moving contact mounting bracket 2, and a transmission component 3. The moving contact body is embedded in the internal cavity of the moving contact mounting bracket and is elastically connected by an elastic component 4 to form a symmetrical clamping structure, floating across two adjacent stationary contacts. The moving contact mounting bracket is fixed to the transmission component. The transmission component is connected to the operating mechanism of the tap changer, thereby driving the moving contact to move and change positions.

[0023] Furthermore, the moving contact mounting bracket is provided with a U-shaped groove, and the moving contact body is symmetrically arranged on both sides of the U-shaped groove, and is connected to the moving contact mounting bracket through the internally inserted pin 5.

[0024] In this embodiment, the moving contact body is a clip-on type moving contact, and multiple clip-on moving contacts are arranged in parallel as a group. The number of moving contact pairs can be increased or decreased according to the tap changer current, which can meet all current specifications in practical applications.

[0025] Furthermore, the side wall of the mounting cavity is divided into multiple mounting cavities by partitions 6, and the clip-on moving contact is embedded in the mounting cavity. Multiple sets of clip-on moving contacts are installed in separate zones to avoid tilting due to force during the process of the moving contact moving and changing positions and contacting the stationary contact moving up or down, thus ensuring the installation stability of the moving contact.

[0026] In this embodiment, one end of the clip-type moving contact is in contact with the stationary contact, and the other end of the clip-type moving contact is provided with an elastic element, which is a spring. The two side walls of the U-shaped groove are provided with matching guide grooves 7 corresponding to the positions of the springs. The two ends of the spring abut against the clip-type moving contact and the guide grooves, respectively.

[0027] Meanwhile, the clip-type moving contact is provided with an oblong hole 8, and the moving contact mounting bracket is provided with a corresponding round hole. The pin passes through the oblong hole and the round hole, and the two ends are pressed and riveted to fix them.

[0028] Furthermore, the inner end face of the clip-on moving contact has a structure with convex sides and concave center, which increases the feel during gear shifting.

[0029] In the second embodiment of the present invention, the transmission component is a lead screw, which is mounted on the moving contact mounting bracket. The top of the lead screw is connected to the operating mechanism, and the rotation of the lead screw drives the moving contact mounting bracket to move along the axial direction of the lead screw.

[0030] In the third embodiment of the present invention, the transmission component is a gear and rack mechanism. The rack is fixedly connected to the moving contact mounting bracket, the gear is fixed to the insulating plate through the base, and the gear is connected to the operating mechanism through the gear shaft. When the gear rotates, the gear and rack mesh to drive the moving contact mounting bracket to move.

[0031] In the fourth embodiment of the present invention, the transmission component is a grooved bar shift fork mechanism. The grooved bar is fixedly connected to the moving contact mounting bracket, the shift fork is connected to the operating mechanism, the grooved bar and the shift fork are configured together, and the rotation of the shift fork drives the grooved bar to move, thereby realizing gear shifting.

[0032] In practical use, the moving contact floats across two adjacent stationary contacts. When the tap changer changes gears, the tap changer's operating mechanism drives the transmission components. The screw rotates, causing the moving contact mounting bracket to move along the screw, or the gear rotates, causing the rack and moving contact mounting bracket to move, thus achieving gear changing.

Claims

1. A moving contact for a bar-type non-energized tap changer, characterized in that, It includes a moving contact body, a moving contact mounting bracket, and a transmission component. The moving contact body is embedded in the internal cavity of the moving contact mounting bracket and is elastically connected by an elastic element to form a symmetrical clamping structure. It floats across two adjacent stationary contacts. The moving contact mounting bracket is fixed to the transmission component.

2. The moving contact for a strip-type non-excitation tap changer according to claim 1, characterized in that, The moving contact mounting bracket is provided with a U-shaped groove, and the moving contact body is symmetrically arranged on the two side walls of the U-shaped groove, and is connected to the moving contact mounting bracket through an internally inserted pin.

3. The moving contact for a strip-type non-excitation tap changer according to claim 2, characterized in that, The moving contact body is a clip-on type moving contact, and multiple clip-on moving contacts are arranged in parallel as a group.

4. The moving contact for a strip-type non-excitation tap changer according to claim 3, characterized in that, The side wall of the mounting cavity is divided into multiple mounting cavities by partitions, and the clamp-type moving contact is embedded in the mounting cavity.

5. The moving contact for a bar-type non-excitation tap changer according to claim 3 or 4, characterized in that, One end of the clamp-type moving contact is in contact with the stationary contact, and the other end of the clamp-type moving contact is provided with the elastic element, which is a spring. The two side walls of the U-shaped groove are provided with matching guide grooves corresponding to the positions of the spring. The two ends of the spring are respectively connected to the clamp-type moving contact and the guide groove to abut against each other.

6. The moving contact for a bar-type non-excitation tap changer according to claim 5, characterized in that, The clamp-type moving contact is provided with an oblong hole, and the moving contact mounting bracket is provided with a corresponding round hole. The pin passes through the oblong hole and the round hole, and the two ends are pressed and riveted to fix them.

7. The moving contact for a strip-type non-excitation tap changer according to claim 3 or 6, characterized in that, The inner end face of the clamp-type moving contact has a structure with convex sides and concave center.

8. The moving contact for a bar-type non-excitation tap changer according to claim 1 or 6, characterized in that, The transmission component is a lead screw, which is mounted on the moving contact mounting bracket and drives the moving contact mounting bracket to move along the axial direction of the lead screw.

9. The moving contact for a bar-type non-excitation tap changer according to claim 1 or 6, characterized in that, The transmission component is a gear and rack mechanism, in which the rack is fixedly connected to the moving contact mounting bracket, and the meshing of the gear and rack drives the moving contact mounting bracket to move.

10. The method for using the moving contact of a strip-type non-excitation tap changer as described in claim 6, characterized in that, Includes the following: The moving contact floats across two adjacent stationary contacts. When the tap changer changes gears, the tap changer's operating mechanism drives the transmission component. The screw rotates, causing the moving contact mounting bracket to move along the screw, or the gear rotates, causing the rack and moving contact mounting bracket to move, thus achieving gear changing.

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