Combined mutual inductor convenient to install and fix
Patent Information
- Application Number
- CN202611374831.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-07
- Publication Date
- 2026-10-27
AI Technical Summary
[0003]但是，上述现有的安装固定方式在实际使用中存在以下不足：采用螺栓紧固时需逐一对准安装孔并使用工具将多颗螺栓拧紧，操作步骤繁琐、耗时较长，而组合式互感器本身体积较大、重量较重，安装时往往需要多人配合，安装效率低；配电柜、环网柜等设备内部空间狭小，操作工具难以进入，导致螺栓紧固和后期检修维护极为不便；互感器在长期运行中受电磁力及周围设备振动的影响，螺栓连接容易松动脱落，影响安装稳固性和测量精度，存在安全隐患，且维护工作量大；此外，螺栓安装依赖人工对孔，难以保证每次安装的位置一致性，互换性较差
（1）本申请通过在互感器本体底部设置增高柱、侧边板和限位孔，并在安装底座上设置中心孔、限位杆、安装孔、转动仓、挡块及限制机构，使互感器本体能够先通过限位杆与限位孔实现快速定位，再通过旋转互感器本体使侧边板进入转动仓，最后利用挡块对侧边板进行限位固定，从而代替传统多螺栓逐一紧固的安装方式。该结构安装步骤少，定位准确，拆装方便，尤其适用于配电柜、环网柜等内部空间有限的场合，能够显著提高组合式互感器的安装和检修效率；
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Figure CN122991804A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of instrument transformer technology, and specifically relates to a combined instrument transformer that is easy to install and fix. Background Technology
[0002] Instrument transformers are crucial devices in power systems used for measurement and protection. They mainly include current transformers and voltage transformers, while combined instrument transformers are power devices that integrate the functions of both current and voltage transformers into one unit. Simply put, it integrates both current and voltage measurement units within a single insulated body, simultaneously outputting current and voltage signals for power system metering, measurement, and protection. Compared to using two separate transformers, combined instrument transformers save space and cost, and effectively avoid ferroresonance. In practical engineering applications, combined instrument transformers need to be fixedly installed on the mounting plate, bracket, or base plate of the distribution cabinet. Currently, most existing combined instrument transformers are installed and fixed using bolts, i.e., mounting holes or mounting feet are provided on the bottom of the transformer housing, and multiple bolts are used to secure the transformer to the mounting surface one by one.
[0003] However, the existing installation and fixing methods have the following shortcomings in practical use: When using bolts for fastening, each bolt must be aligned with the mounting hole and tightened using tools, making the operation cumbersome and time-consuming. Furthermore, the combined instrument transformer itself is large and heavy, often requiring multiple people to cooperate during installation, resulting in low installation efficiency. The confined space inside equipment such as distribution cabinets and ring main units makes it difficult to access tools, leading to extreme inconvenience in bolt tightening and subsequent maintenance. During long-term operation, the instrument transformer is affected by electromagnetic forces and vibrations from surrounding equipment, causing bolt connections to loosen and fall off, affecting installation stability and measurement accuracy, posing safety hazards, and requiring significant maintenance. In addition, bolt installation relies on manual hole alignment, making it difficult to ensure consistent installation positions and resulting in poor interchangeability. Therefore, how to provide a combined instrument transformer that is quick to install, reliably fixed, has good vibration resistance, and is easy to disassemble and maintain has become a pressing technical problem to be solved in this field. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a combined current transformer that is easy to install and fix.
[0005] The technical solution adopted to solve the above technical problems is: A modular current transformer that is easy to install and fix includes a current transformer body and a mounting base. A riser column is fixedly installed at the bottom of the current transformer body. Several side plates are arranged around the side wall of the riser column. A limit hole is opened at the bottom of the riser column. The mounting base has a central hole at its top, which corresponds to the position of the heightening column. A limit rod is fixedly installed at the bottom of the central hole and inserted into the limit hole. Several mounting holes are provided on the side wall of the central hole, and the size of the mounting holes is consistent with the size of the side plates. Several rotating chambers are also provided at the top of the mounting base. Each rotating chamber has a mounting hole on one side and a stop block is slidably installed in each rotating chamber. A working cavity is provided at the bottom of the rotating chamber, and a limiting mechanism for driving the stop block is provided in the working cavity.
[0006] Furthermore, the mounting base has angled insertion holes on its side wall.
[0007] Furthermore, one side wall of the stop block abuts against the side wall of the rotating chamber, and the other side wall abuts against the side wall of the side plate. The end of the stop block facing the central hole has an arc-shaped design.
[0008] Furthermore, a motion groove is provided at the bottom of the rotating chamber, and a support rod is slidably connected in the motion groove. The top of the support rod is fixedly connected to the bottom of the stop block. A storage compartment is also provided on the side wall of the rotating chamber away from the central hole.
[0009] Furthermore, the limiting mechanism includes a rotating base, a drive gear, a central gear disk, and several moving blocks. The rotating base is disposed in the working cavity. The drive gear is rotatably connected to the top of the rotating base. A drive groove is formed on the side wall of the drive gear, and the drive groove is directly opposite the oblique insertion hole. The central gear disk is rotatably connected to the rotating base. The drive gear meshes with the bottom of the central gear disk. A planar thread is formed on the top of the central gear disk. Several moving blocks mesh with the planar thread respectively. Several support rods are fixedly connected to the top of the moving blocks respectively.
[0010] Furthermore, the movement direction of the moving block is towards the center hole position, and the number of moving blocks is the same as the number of stops.
[0011] The beneficial effects of the present invention through the above technical solution are as follows: (1) This application provides a heightening column, side plate, and limiting hole at the bottom of the current transformer body, and a center hole, limiting rod, mounting hole, rotating chamber, stop block, and limiting mechanism on the mounting base. This allows the current transformer body to be quickly positioned by the limiting rod and limiting hole, then the side plate to enter the rotating chamber by rotating the current transformer body, and finally the side plate to be limited and fixed by the stop block. This replaces the traditional installation method of tightening multiple bolts one by one. This structure has fewer installation steps, accurate positioning, and convenient disassembly and assembly. It is especially suitable for occasions with limited internal space, such as distribution cabinets and ring main units, and can significantly improve the installation and maintenance efficiency of combined current transformers. (2) This application sets up a limiting mechanism consisting of a drive gear, a central gear plate, a planar thread, and multiple moving blocks, so that the operator only needs to insert the operating rod into the inclined insertion hole on the side wall of the mounting base to drive multiple blocks to move synchronously, thereby achieving synchronous locking or releasing of multiple side plates. After the blocks abut against the side plates, they can limit the reverse rotation of the current transformer body and reduce the risk of loosening caused by vibration; the end of the blocks adopts an arc design, which facilitates the rotation of the side plates and can also block the entrance of the rotating chamber in the locked state, reducing the entry of dust and debris into the mounting base and improving the reliability of the device operation; (3) By combining the heightening column, the limiting hole and the limiting rod, this application can complete the initial guidance and position limiting when assembling the current transformer body, so that the assembly position of the current transformer body and the mounting base is more accurate, reducing the manual repeated adjustment of the hole, reducing installation error, and improving the overall assembly consistency and installation efficiency. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a bottom view of the transformer body in this invention; Figure 3 This is a schematic diagram of the structural connection of the mounting base in this invention; Figure 4 This is a schematic diagram of the structural connection between the rotating compartment and the storage compartment in this invention; Figure 5 This is a schematic diagram of the structural connection of the limiting mechanism in this invention.
[0013] Reference numerals in the attached drawings: 1. Current transformer body; 2. Mounting base; 3. Heightening column; 4. Side plate; 5. Limiting hole; 6. Center hole; 7. Limiting rod; 8. Mounting hole; 9. Rotating chamber; 10. Stop block; 11. Angled insertion hole; 12. Motion slot; 13. Support rod; 14. Storage chamber; 15. Rotating base; 16. Drive gear; 17. Center gear plate; 18. Motion block; 19. Drive slot; 20. Flat thread. Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0015] like Figure 1 - Figure 5As shown, this embodiment provides a modular instrument transformer that is easy to install and fix, including an instrument transformer body 1 and a mounting base 2. The instrument transformer body 1 can be an indoor epoxy resin cast modular instrument transformer. Of course, in other embodiments, the instrument transformer body 1 can also be set as a 35kV modular instrument transformer according to the needs of the power distribution system. This embodiment does not limit its specific electrical parameters.
[0016] A riser column 3 is fixedly installed at the bottom of the current transformer body 1. The riser column 3 can be integrally formed with the bottom of the current transformer body 1, or it can be connected to the current transformer body 1 by screwing, embedding, or casting. The riser column 3 can be a cylindrical structure. Several side plates 4 are arranged around the side wall of the riser column 3. The side plates 4 can be rectangular plates, arc plates, or approximately fan-shaped plates. In this embodiment, it is preferred to set four rectangular side plates 4, which are evenly distributed along the outer periphery of the riser column 3.
[0017] A limiting hole 5 is provided at the bottom of the riser column 3, preferably located at the center of the bottom of the riser column 3. The limiting hole 5 can be a round hole. By providing the limiting hole 5, the current transformer body 1 can be initially positioned when placed on the mounting base 2, preventing the current transformer body 1 from shifting during installation.
[0018] The mounting base 2 has a central hole 6 at its top, which corresponds to the position of the extension post 3. The central hole 6 can be circular, with a diameter slightly larger than the outer diameter of the extension post 3. For example, the diameter of the central hole 6 can be 1mm-5mm larger than the outer diameter of the extension post 3, thus facilitating the smooth insertion of the extension post 3. The mounting base 2 can be made of steel plate, aluminum alloy plate, or reinforced nylon insulation board. When the mounting base 2 is installed inside a high-voltage switchgear, it is preferable to use a steel plate with a powder-coated surface or a reinforced nylon board with good insulation performance to balance structural strength and insulation performance.
[0019] A limiting rod 7 is fixedly installed at the bottom of the central hole 6, and the limiting rod 7 is inserted into the limiting hole 5. The limiting rod 7 can be a cylindrical metal rod or an insulating rod. After the limiting rod 7 cooperates with the limiting hole 5, it can limit the horizontal movement of the current transformer body 1 relative to the mounting base 2, so that the current transformer body 1 remains stable during subsequent rotation and fixing.
[0020] The central hole 6 has several mounting holes 8 on its sidewall, and the dimensions of the mounting holes 8 are the same as the dimensions of the side plates 4. The mounting holes 8 are mainly used to allow the side plates 4 to enter the mounting base 2 downwards, and the number of mounting holes 8 is the same as the number of side plates 4. The mounting holes 8 can be evenly distributed around the central hole 6, so that the current transformer body 1 can be inserted into the mounting base 2 in a fixed direction.
[0021] The top of the mounting base 2 is also provided with several rotating chambers 9, each located on one side of the mounting hole 8. After the side plate 4 enters the mounting base 2 through the mounting hole 8, the operator rotates the current transformer body 1, and the side plate 4 can rotate from the mounting hole 8 into the rotating chamber 9. The arc length of the rotating chamber 9 can be set according to the rotation angle of the side plate 4. For example, the side plate 4 can rotate 15°-45° relative to the mounting base 2 to reach the end of the rotating chamber 9, thus completing the screw-in action.
[0022] Each rotating chamber 9 is slidably equipped with a stop 10. One side wall of the stop 10 abuts against the side wall of the rotating chamber 9, and the other side wall abuts against the side wall of the side plate 4. When the stop 10 slides to the locked position, it can prevent the side plate 4 from rotating in the opposite direction, thereby preventing the transformer body 1 from detaching from the mounting base 2. The end of the stop 10 facing the central hole 6 has an arc-shaped design. This arc-shaped structure can reduce the interference between the stop 10 and the side plate 4, making the extension and retraction of the stop 10 smoother.
[0023] The mounting base 2 has an angled insertion hole 11 on its side wall. The angled insertion hole 11 is used to insert the operating rod into the mounting base 2. The angle between the axis of the angled insertion hole 11 and the top surface of the mounting base 2 can be 30°-60°, preferably 45°. By using the angled insertion hole 11, even in a relatively narrow cabinet space, the operator can insert the operating rod at an angle from the side, avoiding obstruction by the current transformer body 1 when operating from directly above the mounting base 2.
[0024] A motion groove 12 is provided at the bottom of the rotating chamber 9, and a support rod 13 is slidably connected in the motion groove 12. The top of the support rod 13 is fixedly connected to the bottom of the stop block 10. The support rod 13 is used to drive the stop block 10 to slide synchronously in the rotating chamber 9. A storage compartment 14 is also provided on the side wall of the rotating chamber 9 away from the central hole 6. When it is necessary to install or remove the current transformer body 1, the stop block 10 can move into the storage compartment 14 to avoid the rotation path of the side plate 4.
[0025] The bottom of the rotating chamber 9 has a working cavity, in which a limiting mechanism for driving the stop block 10 is installed. The limiting mechanism includes a rotating base 15, a drive gear 16, a central gear plate 17, and several moving blocks 18. The rotating base 15 is located in the working cavity and can be connected to the mounting base 2 by screw fixing or embedding. The drive gear 16 is rotatably connected to the top of the rotating base 15, and a drive groove 19 is opened on the side wall of the drive gear 16, which is directly opposite the oblique insertion hole 11. The drive groove 19 can be a slotted groove, an internal hexagonal groove, or a square groove. Correspondingly, the end of the operating lever can be set to be slotted, hexagonal, or square, so that the operating lever can reliably drive the drive gear 16 to rotate.
[0026] The central gear disk 17 is rotatably connected to the rotating base 15, and the drive gear 16 meshes with the bottom of the central gear disk 17. When the drive gear 16 rotates, it can drive the central gear disk 17 to rotate around its own axis. A planar thread 20 is provided on the top of the central gear disk 17, and several moving blocks 18 respectively mesh with the planar thread 20. The movement direction of the moving blocks 18 points to the position of the central hole 6, and the number of moving blocks 18 is the same as the number of stops 10. Several support rods 13 are fixedly connected to the top of the moving blocks 18 respectively. Therefore, when the central gear disk 17 rotates, the planar thread 20 can synchronously drive multiple moving blocks 18 to move radially, and then drive multiple stops 10 to extend or retract synchronously through the support rods 13.
[0027] In this embodiment, the engagement between the central gear disk 17 and the planar thread 20 is similar to the synchronous drive structure of a three-jaw chuck or a four-jaw chuck. When the central gear disk 17 rotates clockwise, multiple moving blocks 18 can move synchronously toward the central hole 6, causing the stop block 10 to extend and limit the side plate 4; when the central gear disk 17 rotates counterclockwise, multiple moving blocks 18 can move synchronously away from the central hole 6, causing the stop block 10 to retract into the storage compartment 14, so that the current transformer body 1 can be installed or removed.
[0028] The working principle of this embodiment is as follows: Before installing the transformer body 1, the operator inserts the operating rod, which matches the shape of the drive slot 19, into the inclined insertion hole 11, so that the end of the operating rod enters the drive slot 19. Then, the operating rod is rotated, which drives the drive gear 16 to rotate, and the drive gear 16 further drives the central gear disk 17 to rotate. Since the top of the central gear disk 17 is provided with a planar thread 20, the planar thread 20 will drive several moving blocks 18 to move synchronously away from the central hole 6. The moving blocks 18 drive the stop block 10 to move through the support rod 13, so that the stop block 10 retracts from the rotating chamber 9 into the storage chamber 14.
[0029] At this point, the workers hoist or move the current transformer body 1 above the mounting base 2, align the lifting column 3 with the center hole 6, align the limiting hole 5 with the limiting rod 7, and align the side plate 4 with the mounting hole 8. Then, the current transformer body 1 is lowered so that the limiting rod 7 is inserted into the limiting hole 5, while the lifting column 3 enters the center hole 6 and the side plate 4 enters the mounting hole 8. With the limiting rod 7 and the limiting hole 5 engaged, the current transformer body 1 is less prone to horizontal displacement, facilitating subsequent rotation and positioning.
[0030] After the current transformer body 1 is placed in place, the operator rotates the current transformer body 1, causing the side plate 4 to rotate along the rotating chamber 9 until the side plate 4 reaches the end of the rotating chamber 9. At this point, the current transformer body 1 has been screwed into position. Then, the operator rotates the operating lever in the opposite direction, causing the drive gear 16 to rotate in the opposite direction. The drive gear 16 drives the central gear disk 17 to rotate in the opposite direction. The central gear disk 17 drives several moving blocks 18 to move towards the central hole 6 through the planar thread 20. The moving blocks 18 push the stop block 10 from the storage chamber 14 into the rotating chamber 9 through the support rod 13.
[0031] When the stop block 10 returns to the locked position, its side wall abuts against the side wall of the side plate 4, preventing the side plate 4 from rotating in the opposite direction. This restricts the rotation of the current transformer body 1 relative to the mounting base 2, thus securing the current transformer body 1 in place. Simultaneously, the stop block 10 also blocks the opening area of the rotating chamber 9, reducing the entry of dust and debris into the rotating chamber 9 or the working cavity, which helps ensure the long-term stable operation of the limiting mechanism.
[0032] When it is necessary to disassemble the current transformer body 1, the operator inserts the operating lever again into the drive slot 19 through the oblique insertion hole 11 and rotates the operating lever, causing the drive gear 16 to drive the central gear plate 17 to rotate. The central gear plate 17 drives several moving blocks 18 to move away from the central hole 6 through the planar thread 20, thereby causing the stop block 10 to retract into the storage compartment 14. Then, the current transformer body 1 is rotated in the opposite direction, causing the side plate 4 to return from the rotating compartment 9 to the mounting hole 8 position. Finally, the current transformer body 1 is lifted upwards to complete the disassembly. The entire disassembly process does not require removing multiple bolts one by one, making the operation more convenient.
[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.
Claims
1. A modular current transformer that is easy to install and fix, comprising a current transformer body (1) and a mounting base (2), characterized in that: The transformer body (1) is fixedly provided with a heightening column (3) at the bottom. The side wall of the heightening column (3) is surrounded by several side plates (4). The bottom of the heightening column (3) is provided with a limit hole (5). The mounting base (2) has a central hole (6) at the top, and the position of the central hole (6) corresponds to the position of the heightening column (3). A limit rod (7) is fixedly installed at the bottom of the central hole (6), and the limit rod (7) is inserted into the limit hole (5). Several mounting holes (8) are opened on the side wall of the central hole (6), and the size of the several mounting holes (8) is consistent with the size of several side plates (4). Several rotating chambers (9) are also opened at the top of the mounting base (2). Each rotating chamber (9) is installed on one side of the mounting hole (8), and a stop block (10) is slidably installed in each rotating chamber (9). A working cavity is opened at the bottom of the rotating chamber (9), and a limiting mechanism for driving the stop block (10) is provided in the working cavity.
2. The modular current transformer for easy installation and fixing according to claim 1, characterized in that, The mounting base (2) has a slanted insertion hole (11) on its side wall.
3. The modular instrument transformer for easy installation and fixing according to claim 1, characterized in that, The side wall of the stop block (10) abuts against the side wall of the rotating chamber (9), and the other side wall abuts against the side wall of the side plate (4). The end of the stop block (10) facing the center hole (6) is arc-shaped.
4. The modular current transformer for easy installation and fixing according to claim 2, characterized in that, The rotating chamber (9) has a motion groove (12) at the bottom, and a support rod (13) is slidably connected in the motion groove (12). The top of the support rod (13) is fixedly connected to the bottom of the stop block (10). A storage compartment (14) is also provided on the side wall of the rotating chamber (9) away from the central hole (6).
5. The modular current transformer for easy installation and fixing according to claim 4, characterized in that, The limiting mechanism includes a rotating base (15), a drive gear (16), a central gear plate (17), and several moving blocks (18). The rotating base (15) is disposed in the working cavity. The drive gear (16) is rotatably connected to the top of the rotating base (15). The drive gear (16) has a drive groove (19) on its side wall, which is directly opposite to the oblique insertion hole (11). The central gear plate (17) is rotatably connected to the rotating base (15). The drive gear (16) meshes with the bottom of the central gear plate (17). The central gear plate (17) has a planar thread (20) on its top. Several moving blocks (18) mesh with the planar thread (20) respectively. Several support rods (13) are fixedly connected to the top of the moving blocks (18) respectively.
6. The modular current transformer for easy installation and fixing according to claim 5, characterized in that, The movement direction of the moving block (18) is directed towards the center hole (6), and the number of the moving blocks (18) is the same as the number of the stops (10).