Current transformer with interference immunity

Abstract

The application relates to the technical field of current transformers, and discloses a current transformer with anti-interference, which comprises a transformer main body and a mounting disc, the upper surface of the mounting disc is rotationally connected with a supporting plate through a damping rotating shaft, the upper surface of the supporting plate is fixedly connected with two limit rods which are symmetrically arranged and vertically arranged, and the outer surfaces of the two limit rods are slidably connected with an angle seat. The current transformer with anti-interference is characterized in that the mounting disc and the supporting plate are rotationally connected through the damping rotating shaft, the sliding design of the angle seat on the limit rod is adopted, the horizontal direction rotation of the transformer main body and the spacing adjustment in the vertical direction are realized, different installation spaces and cable direction requirements can be quickly adapted, electromagnetic coupling interference caused by excessive bending of the cable is avoided, the angle shaft and the worm gear are arranged, the inclination angle of the transformer main body is adjusted, the angle is locked by the one-way self-locking characteristic of the worm gear, the angle deviation caused by external vibration is effectively inhibited, and the measurement stability is ensured.

Description

Technical Field

[0001] This application relates to the field of current transformer technology, specifically to a current transformer with anti-interference capabilities. Background Technology

[0002] A current transformer with a through-hole design is a commonly used electrical measuring device. It converts high current through one side of the transformer's coil into a low current output, thereby enabling accurate current measurement. Its principle is mainly based on electromagnetic induction and magnetic flux balance.

[0003] An existing patent (publication number: CN223078943U) discloses a current transformer with anti-interference capabilities. This utility model relates to the field of current transformer technology, and more particularly to a current transformer with anti-interference capabilities. It is fixed to a mounting plate, on which the current transformer is mounted. The current transformer is equipped with a fixing mechanism to prevent loosening after it is fixed to the mounting plate. The fixing mechanism includes: a main component, comprising pins through both ends of the current transformer, a pin rod slidably mounted inside the pins, a guide block fixed to the bottom of the pin rod, four circumferentially distributed cavities at the lower end of the pins, a positioning clip rotatably mounted inside the cavities via a rotating shaft, a protrusion fixed to the lower end of the inner wall of the positioning clip, and a nut threaded onto the outer wall of the upper end of the pins. This fixing mechanism replaces bolts for fixing and prevents the nut from easily loosening, thus avoiding instability after the current transformer is installed.

[0004] The aforementioned current transformers are fixed using a fixing mechanism instead of bolts, preventing nuts from loosening and avoiding instability after installation. However, once fixed, the installation angle and distance from the mounting surface are difficult to adjust, making it difficult to adapt to different installation directions and positions in complex cabinets or confined spaces, affecting installation efficiency and measurement accuracy. When cables are installed through the core, the lack of effective fixing devices allows the cables to sway due to external forces or their own weight, causing friction or contact with the inner wall of the transformer. This can not only cause electromagnetic interference, such as stray magnetic fields affecting measurement accuracy, but also accelerate the wear of the cable insulation layer, shortening the equipment's service life. Utility Model Content

[0005] In view of the shortcomings of the prior art, this application provides a current transformer with anti-interference, which has the advantages of concentric cable and transformer and easy adjustment, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a current transformer with anti-interference capability, comprising a transformer body and a mounting plate, wherein a support plate is rotatably connected to the upper surface of the mounting plate via a damping shaft, and two symmetrically arranged and vertically positioned limiting rods are fixedly connected to the upper surface of the support plate, and an angle seat is slidably connected to the outer surface of the two limiting rods.

[0007] An angle shaft is rotatably connected between the two inner sidewalls of the angle seat, and the bottom end of the transformer body is fixedly connected to the angle shaft.

[0008] Two cable fixing assemblies are installed on the surface of the transformer body.

[0009] Furthermore, the upper surface of the mounting plate is provided with a set of first connecting holes arranged in a circle, and the upper surface of the support plate is provided with two second connecting holes.

[0010] By using the above scheme, the transformer body is rotated by the damping shaft, and the orientation angle of the transformer is adjusted. Then, external bolts are passed through the first and second connection holes respectively to achieve the purpose of limiting the transformer body and connecting it to the external cabinet wall to form a double fixing structure to resist mechanical vibration and electromagnetic disturbance.

[0011] Furthermore, a set of linearly arranged first fixing holes are provided on the outer surface of both limiting rods, and a through second fixing hole is provided on one side of the angle seat.

[0012] With the above scheme, after adjusting the distance between the transformer body and the mounting plate, the distance is mechanically locked by passing the fixing bolts through the second fixing hole of the angle seat and the corresponding first fixing hole on the limit rod.

[0013] Furthermore, a worm gear is fixedly connected to the middle end of the angle shaft, and a worm is rotatably connected to the upper surface of the angle seat, which is perpendicular to the worm. The worm meshes with the worm gear, and a knob is fixedly connected to one end of the worm.

[0014] The above scheme uses a knob to drive the worm gear to rotate, and utilizes the one-way self-locking characteristic of the worm gear transmission to achieve precise adjustment of the rotation angle of the transformer body, effectively suppressing angle deviation caused by external vibration and improving the ability to resist mechanical interference.

[0015] Furthermore, the cable fixing assembly includes two support frames, the bottom ends of which are fixedly connected to the outer surface of the transformer body, and the top ends of the two support frames are fixedly connected to the same first arc-shaped clamp. A second arc-shaped clamp is arranged above the first arc-shaped clamp, and the first arc-shaped clamp and the second arc-shaped clamp are symmetrically arranged.

[0016] The above solution suppresses cable sway and maintains its coaxiality with the transformer axis, reducing stray magnetic field interference caused by cable eccentricity.

[0017] Furthermore, the first and second arc-shaped clips are made of insulating PC material.

[0018] The above solution achieves both electrical isolation and environmental resistance.

[0019] Furthermore, threaded rods are rotatably connected to the upper surfaces of both sides of the first arc-shaped clamp, and the second arc-shaped clamp is threadedly connected to the two threaded rods.

[0020] The above solution allows for the rotation of the threaded rod to drive the second arc-shaped clamp to move axially to clamp or release the cable, adapting to different wire diameters and enabling quick assembly and disassembly.

[0021] Furthermore, the second arc-shaped clamp and the first arc are on the same axis as the transformer body.

[0022] The above method ensures that the cable thread path coincides with the current transformer's magnetic circuit, eliminating measurement errors caused by cable eccentricity.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0024] This anti-interference current transformer features a mounting plate and support plate connected by a damping shaft. Combined with the sliding design of the angle seat on the limit rod, it enables horizontal rotation of the transformer body and vertical spacing adjustment. This allows for quick adaptation to different installation spaces and cable routing requirements, avoiding electromagnetic coupling interference caused by excessive cable bending. The angle shaft and worm gear allow for adjustment of the transformer body's tilt angle. The worm gear's one-way self-locking characteristic locks the angle, effectively suppressing angle deviation caused by external vibration and ensuring measurement stability.

[0025] The symmetrically arranged dual-cable fixing assembly, through the clamping of the first and second arc-shaped clamps, ensures that the cable axis coincides with the magnetic circuit of the current transformer during installation, avoiding stray magnetic field interference caused by cable eccentricity, ensuring efficient coupling of the current magnetic field with the current transformer core, and improving measurement accuracy. The threaded rod driven second arc-shaped clamp can be adapted to different wire diameters, realizing quick clamping and release, balancing the reliability of cable fixing and the convenience of operation. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application. Figure 1 ;

[0027] Figure 2 This is a front view of the overall structure of this application;

[0028] Figure 3 This is a three-dimensional schematic diagram of the overall structure of this application. Figure 2 ;

[0029] Figure 4 This is a structural diagram of the cable fixing assembly of this application.

[0030] In the picture:

[0031] 1. Current transformer body; 2. Mounting plate; 201. First connection hole;

[0032] 3. Support plate; 301. Second connecting hole;

[0033] 4. Limiting rod; 401. First fixing hole;

[0034] 5. Angle seat; 501. Second fixing hole;

[0035] 6. Angle axis;

[0036] 7. Cable fixing assembly; 701. Support frame; 702. First arc-shaped clamp; 703. Second arc-shaped clamp; 704. Threaded rod;

[0037] 8. Worm gear; 9. Worm; 10. Knob. Detailed Implementation

[0038] 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. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] Please see Figures 1-4 This embodiment of an anti-interference current transformer includes a transformer body 1 and a mounting plate 2. The upper surface of the mounting plate 2 is rotatably connected to a support plate 3 via a damping shaft. Two symmetrically arranged and vertically positioned limiting rods 4 are fixedly connected to the upper surface of the support plate 3. A set of first connecting holes 201 arranged in a circle are opened on the upper surface of the mounting plate 2, and two second connecting holes 301 are opened on the upper surface of the support plate 3. After the transformer body 1 is rotated by the damping shaft and the orientation angle of the transformer is adjusted, external bolts are used to pass through the first connecting holes 201 and the second connecting holes 301 respectively, which can achieve the purpose of limiting the transformer body 1 and connecting it to the external cabinet wall to form a double fixed structure to resist mechanical vibration and electromagnetic disturbance.

[0040] An angle seat 5 is slidably connected to the outer surfaces of the two limiting rods 4. The angle seat 5 and the limiting rod 4 are slidably connected to each other, which makes it easy to adjust the distance between the current transformer body 1 and the mounting plate 2, adapt to different installation space requirements and avoid excessive bending of the cable. A set of linearly arranged first fixing holes 401 are opened on the outer surfaces of the two limiting rods 4. A through second fixing hole 501 is opened on one side of the angle seat 5. After the distance between the current transformer body 1 and the mounting plate 2 is adjusted, the distance is mechanically locked by passing the fixing bolts through the second fixing hole 501 of the angle seat 5 and the corresponding first fixing hole 401 on the limiting rod 4.

[0041] An angle shaft 6 is rotatably connected between the two inner sidewalls of the angle seat 5. The bottom end of the current transformer body 1 is fixedly connected to the angle shaft 6, enabling precise rotation adjustment of the current transformer body 1 around the angle shaft 6. A worm gear 8 is fixedly connected to the middle end of the angle shaft 6. A worm 9 is rotatably connected to the upper surface of the angle seat 5 and is perpendicular to it. The worm 9 meshes with the worm gear 8. A knob 10 is fixedly connected to one end of the worm 9. The worm 9 is driven to rotate by the knob 10. By utilizing the one-way self-locking characteristic of the worm gear 8 and worm 9 transmission, the precise adjustment of the rotation angle of the current transformer body 1 is achieved, effectively suppressing the angle deviation caused by external vibration, improving the anti-mechanical interference capability, and maintaining the angle stability through the self-locking function of the worm gear 8 and worm 9.

[0042] Two cable fixing assemblies 7 are mounted on the surface of the transformer body 1. These assemblies secure the cables. Each cable fixing assembly 7 includes two support brackets 701, the bottom ends of which are fixedly connected to the outer surface of the transformer body 1. A first arc-shaped clamp 702 is fixedly connected to the top of each support bracket 701. A second arc-shaped clamp 703 is positioned above the first arc-shaped clamp 702. The first and second arc-shaped clamps 702 are symmetrically arranged to suppress cable movement and maintain coaxiality with the transformer body 1, reducing cable eccentricity. To mitigate stray magnetic field interference, the first arc-shaped clamp 702 and the second arc-shaped clamp 703 are made of insulating PC material to achieve electrical isolation and environmental resistance. Threaded rods 704 are rotatably connected to the upper surfaces of both sides of the first arc-shaped clamp 702. The second arc-shaped clamp 703 is threadedly connected to the two threaded rods 704. By rotating the threaded rods 704, the second arc-shaped clamp 703 is driven to move axially to clamp or release the cable, adapting to different wire diameters and enabling quick assembly and disassembly. The second arc-shaped clamp 703 and the first arc-shaped clamp 702 are on the same axis as the transformer body 1, ensuring that the cable thread path coincides with the transformer's magnetic circuit, eliminating measurement errors caused by cable eccentricity.

[0043] The working principle of the above embodiment is as follows: The operator drives the support plate 3 to rotate horizontally by rotating the damping shaft, thereby adjusting the current transformer body 1 to the target orientation to adapt to the wiring direction of the cabinet. After adjustment, the external bolts are passed through the first connecting hole 201 on the mounting plate 2 and the second connecting hole 301 on the support plate 3 and tightened. The sliding angle seat 5 moves up and down along the limit rod 4 to adjust the distance between the current transformer body 1 and the mounting plate 2 to a suitable value to adapt to cabinet walls of different thicknesses or to avoid excessive bending of cables. After adjustment, the fixing bolts are passed through the second fixing hole 501 on the side of the angle seat 5 and the corresponding first fixing hole 401 on the limit rod 4 and locked to achieve mechanical locking of the distance and prevent changes in distance caused by sliding. The worm gear 9 is driven to rotate by the knob 10. The worm gear 8 meshing with it rotates, which in turn drives the angle shaft 6 and the transformer body 1 to rotate around the axis, achieving precise adjustment of the tilt angle. Utilizing the one-way self-locking characteristic of the worm gear 8 and worm 9 transmission, the worm 9 cannot be driven in the reverse direction after adjustment. The cable to be tested is passed sequentially between the first arc-shaped clamp 702 and the second arc-shaped clamp 703 of the two cable fixing components 7 to ensure that the cable axis is initially aligned with the axis of the transformer body 1. The threaded rods 704 on both sides of the first arc-shaped clamp 702 are rotated to drive the second arc-shaped clamp 703 to move downward along the axis until it clamps the cable together with the first arc-shaped clamp 702. The second arc-shaped clamp 703 is coaxial with the transformer body 1. After the cable is fixed, its axis is aligned with the magnetic circuit of the transformer, eliminating stray magnetic field interference caused by cable eccentricity.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A current transformer with anti-interference capability, comprising a transformer body (1) and a mounting plate (2), characterized in that: The upper surface of the mounting plate (2) is rotatably connected to a support plate (3) via a damping shaft. Two symmetrically arranged and vertically set limiting rods (4) are fixedly connected to the upper surface of the support plate (3). An angle seat (5) is slidably connected to the outer surface of the two limiting rods (4). An angle shaft (6) is rotatably connected between the two inner sidewalls of the angle seat (5), and the bottom end of the transformer body (1) is fixedly connected to the angle shaft (6). Two cable fixing assemblies (7) are installed on the surface of the transformer body (1).

2. The current transformer with anti-interference capability according to claim 1, characterized in that: The upper surface of the mounting plate (2) is provided with a set of first connecting holes (201) arranged in a circle, and the upper surface of the support plate (3) is provided with two second connecting holes (301).

3. A current transformer with anti-interference capability according to claim 1, characterized in that: The outer surfaces of the two limiting rods (4) are provided with a set of linearly arranged first fixing holes (401), and one side of the angle seat (5) is provided with a through second fixing hole (501).

4. A current transformer with anti-interference capability according to claim 1, characterized in that: A worm gear (8) is fixedly connected to the middle end of the angle shaft (6), and a worm (9) is rotatably connected to the upper surface of the angle seat (5) and is perpendicular to it. The worm (9) meshes with the worm gear (8), and a knob (10) is fixedly connected to one end of the worm (9).

5. A current transformer with anti-interference capability according to claim 1, characterized in that: The cable fixing assembly (7) includes two support frames (701). The bottom ends of the two support frames (701) are fixedly connected to the outer surface of the transformer body (1). The top ends of the two support frames (701) are fixedly connected to the same first arc-shaped clip (702). A second arc-shaped clip (703) is provided above the first arc-shaped clip (702). The first arc-shaped clip (702) and the second arc-shaped clip (703) are symmetrically arranged.

6. A current transformer with anti-interference capability according to claim 5, characterized in that: The first arc-shaped clip (702) and the second arc-shaped clip (703) are made of insulating PC material.

7. A current transformer with anti-interference capability according to claim 5, characterized in that: The upper surfaces of both sides of the first arc-shaped clamp (702) are rotatably connected with threaded rods (704), and the second arc-shaped clamp (703) is threadedly connected to the two threaded rods (704).

8. A current transformer with anti-interference capability according to claim 5, characterized in that: The second arc-shaped clamp (703) and the first arc-shaped clamp are on the same axis as the transformer body (1).

Images