Open-close type current transformer

Abstract

The invention discloses an open-close type current transformer, and particularly relates to the technical field of current transformers, the open-close type current transformer comprises a body, a base plate, a mounting bottom plate, a reset assembly, an opening sleeve and a clamping sleeve, and the periphery of the opening sleeve is provided with a plurality of deformation notches penetrating through an inner cavity of the opening sleeve. According to the invention, the cable is clamped by the clamping sleeve, and the reset assembly generates damping force when the base plate slides on the top surface of the mounting bottom plate, so that when the external control cabinet generates vibration, the vibration force is transmitted to the body, and the body is damped and buffered through the reset assembly, so that the body can be buffered; when the body is vibrated, the body and the clamping sleeve synchronously move, so that the clamping sleeve synchronously drives the cable to move, and as the positions of the clamping sleeve and the body are relatively unchanged, the cable is always kept in a coaxial state with the bus hole of the body, and the clamping force of the clamping sleeve on the cable is increased, so that the resistance when the cable is pulled is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of current transformers, and in particular relates to a split-type current transformer. Background Art

[0002] A current transformer (CT) is an instrument that uses the principle of electromagnetic induction to convert high primary current into low secondary current for measurement. It consists of a closed iron core and windings. Its primary winding has a small number of turns and is connected in series with the circuit carrying the current to be measured. Therefore, the entire circuit current always flows through it. The secondary winding has a larger number of turns and is connected in series with the measuring instrument and protective circuit. During operation, the secondary circuit of the CT is always closed, resulting in a very low impedance between the series coils connecting the measuring instrument and protective circuit, and the CT operates in a state close to a short circuit. A CT converts high primary current into low secondary current for measurement, and the secondary circuit cannot be left open. A CT typically consists of an iron core, busbar connections, and secondary terminals.

[0003] For example, a current transformer disclosed in a Chinese patent with publication number CN223038717U relates to the field of current measurement technology and includes a current transformer body, wherein two connecting parts are fixedly connected to the upper surface of the current transformer body, and an adjustment structure is provided on one side of the current transformer body. The adjustment structure includes a long rod, one end of the long rod is fixedly connected to the current transformer body, the arc surface of the long rod is slidably connected to a long tube, the arc surface of the long tube is rotatably connected to a screw, the arc surface of the screw is threadedly connected to a connecting plate, the lower surface of the connecting plate is fixedly connected to an adjusting rod, the lower end of the adjusting rod is fixedly connected to a limiting plate, and the arc surface of the long tube is connected to a U-shaped frame. This current transformer achieves the effect that the current transformer body can be flexibly moved back and forth and left and right within a certain range of the distribution box, and solves the problem that the current transformer body is relatively fixed after installation, so that the line layout in the distribution box needs to be re-drilled and installed after the overall cumbersomeness is increased.

[0004] In the prior art, cables are typically passed through the busbar hole of a current transformer to detect current magnitude. When passing through the busbar hole, the cable is generally required to maintain a certain coaxial state with the busbar hole. Maintaining the coaxiality of the cable and the busbar hole helps ensure uniform current distribution, thereby reducing magnetic field unevenness and improving measurement accuracy. Especially in the case of high frequency or high current, the eccentricity of the cable may cause uneven magnetic field distribution, resulting in measurement errors. In the prior art, current transformers are generally installed in distribution cabinets. If the distribution cabinet is hit, the current transformer may become loose. At this time, the position of the cable and the busbar hole will change relative to each other, resulting in a large deviation between the cable and the busbar hole axis. In addition, if the portion of the cable located in the busbar hole is bent, it may also affect the uniformity of the magnetic field, thereby affecting the current detection accuracy. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a split-type current transformer.

[0006] The technical solution adopted to solve the above technical problems is: a split-type current transformer, including a body of the split-type current transformer, and further comprising: A pad is detachably connected to the bottom of the body, the bottom of the pad is in contact with the mounting base, and the pad slides freely on the top surface of the mounting base; A reset assembly is provided on the mounting base plate, and is used to generate a damping force when the backing plate slides on the top surface of the mounting base plate; There are two expansion sleeves, which are respectively connected to the axial end faces of the main body. The outer diameter of the expansion sleeve decreases gradually in the direction away from the main body. The clamping sleeve is fixedly connected to the end with the smallest outer diameter of the expansion sleeve. The periphery of the expansion sleeve is provided with multiple deformation notches that penetrate the inner cavity of the expansion sleeve.

[0007] Through the above technical solution, the cable is clamped by the clamping sleeve, and the reset component generates a damping force on the pad when it slides on the top surface of the installation base plate, so that when the external control cabinet vibrates, the vibration force is transmitted to the main body, and the reset component damps and buffers the main body so that the main body can buffer. In addition, the cable is inserted into the clamping sleeve. When the main body is vibrated, the main body and the clamping sleeve move synchronously, so that the clamping sleeve drives the cable to move synchronously. Since the positions of the clamping sleeve and the main body remain relatively unchanged, the cable always remains coaxial with the busbar hole of the main body. In addition, the expansion sleeve can produce elastic contraction and elastic expansion deformation. The expansion sleeve will enable the clamping sleeve to always maintain the clamping force on the cable, and when the cable is pulled, the two expansion sleeves produce corresponding elastic contraction deformation, thereby increasing the clamping force of the clamping sleeve on the cable, thereby increasing the resistance of the cable when being pulled, and making the cable located between the two clamping sleeves in a straight state, so that the coaxiality of the cable and the current transformer busbar hole is higher.

[0008] Furthermore, the reset assembly includes a protrusion fixed to the bottom of the pad, a first accommodating cavity is opened on the top of the mounting base, the protrusion extends downward into the first accommodating cavity, a spiral spring is installed in the first accommodating cavity, the inner ring of the spiral spring is fixedly sleeved on the periphery of the protrusion, and the end of the outer ring of the spiral spring is fixed to the inner wall of the first accommodating cavity.

[0009] Through the above technical solution, the vortex spring has elastic deformation ability, so that when the pad slides on the surface of the mounting base, the protrusion will move, thereby causing the vortex spring to deform. After the vibration force on the pad disappears, the deformation of the vortex spring itself is restored, thereby causing the protrusion to move to the center position of the inner ring of the vortex spring in the initial state, that is, driving the pad and the main body to return to their initial state.

[0010] Furthermore, the protrusion is coaxially fixedly provided with a limit pin, the mounting base is provided with a connecting hole for the limit pin to pass freely, the inner diameter of the connecting hole is larger than the outer diameter of the limit pin, the lower end of the limit pin is fixedly sleeved with a stop portion, and the bottom surface of the mounting base is provided with a second accommodating cavity for the stop portion to pass freely, and the inner diameter of the second accommodating cavity is larger than the outer diameter of the stop portion.

[0011] Through the above technical solution, when the main body is vibrated, the stop part will move in the second accommodating cavity, and since the inner diameter of the second accommodating cavity is larger than the outer diameter of the stop part, the outer diameter of the limit pin is smaller than the inner diameter of the connecting hole, thereby enabling the main body to move when it is vibrated.

[0012] Furthermore, a plurality of the deformation notches are arranged in an axial array along the expansion sleeve, and the deformation notches extend to the periphery of the clamping sleeve.

[0013] Through the above technical solution, the deformation amplitudes of the multiple parts of the expansion sleeve and the clamping sleeve divided by the multiple deformation notches tend to be consistent.

[0014] Furthermore, the inner wall surface of the clamping sleeve is provided with a rubber layer.

[0015] Through the above technical solution, the provision of the rubber layer makes the friction resistance between the cable and the inner wall of the clamping sleeve larger, thereby preventing the cable from sliding on its own in the clamping sleeve, and increasing the resistance to sliding of the cable in the clamping sleeve when it is pulled.

[0016] Furthermore, support seats are installed on both sides of the mounting base corresponding to the axial ends of the body, the upper ends of the support seats are connected to fixed plates, and a relaxation component is provided on the top of the fixed plate.

[0017] With the above technical solution, the cable is relaxed by the relaxation component, so that when the body moves due to vibration, the cable outside the body can relax, while the cable supported and pulled by the two expansion sleeves is always in a straight state.

[0018] Furthermore, the relaxation component includes two fixed guide wheels that are vertically rotatably connected to the upper surface of the fixed plate, the horizontal connecting line of the two fixed guide wheels is parallel to the axial direction of the main body, a sliding cavity is opened in the fixed plate, a piston is coaxially installed in the sliding cavity, the piston slides freely horizontally in the sliding cavity, and a connecting rod is fixed to the end face of the piston, and the end of the connecting rod that passes through the top surface of the fixed plate is rotatably connected to the floating guide wheel, the floating guide wheel is located between the two fixed guide wheels, and the top surface of the fixed plate is opened with a waist-shaped hole for the connecting rod to pass freely, and the support seat is provided with a driving unit for driving the piston to move in the sliding cavity.

[0019] Through the above technical solution, when the main body is vibrated and moves, the driving unit will be triggered to act, and the driving unit will drive the piston to move in the sliding cavity, so that the piston can squeeze the air in the sliding cavity, and then the piston drives the connecting rod to move, so that the floating guide wheel moves toward the inner side of the fixed plate, and then the cable wrapped around the two fixed guide wheels and the floating guide wheel can produce a relaxation effect, thereby avoiding the situation where the cable tension on the outside of the two clamping sleeves is large when the main body moves, which in turn causes the cable to pull the main body, making it impossible for the main body to be buffered by movement when it is vibrated.

[0020] Furthermore, the driving unit includes a hollow cylinder fixed to the wall surface of the support seat, a sliding block is coaxially mounted in the hollow cylinder, the sliding block slides freely in the hollow cylinder, and a communicating cavity is formed between the sliding block and the inner cavity wall of the hollow cylinder; A spring is horizontally installed in the communicating cavity, and the two ends of the spring in the direction of elastic force elastically press against the sliding block and the inner wall of the communicating cavity respectively. An air pipe is installed on the wall of the hollow cylinder, and the end of the air pipe away from the hollow cylinder is installed on the fixed plate and is connected to the inner cavity of the sliding cavity. A conical groove is coaxially opened on the end surface of the sliding block facing the body, and the inner diameter of the conical groove increases sequentially in the direction away from the support seat; The wall surface of the body is horizontally connected with a driving rod, and one end of the driving rod away from the body penetrates into the conical groove. The outer diameter of the driving rod is smaller than the minimum inner diameter of the conical groove.

[0021] Through the above technical solution, when the main body moves due to vibration, the end of the driving rod will contact the inner wall of the conical groove and generate an extrusion force on the inner wall of the conical groove along the axial direction of the hollow cylinder, so that the sliding block moves toward the support seat in the sliding cavity, and then the sliding block squeezes the air in the hollow cylinder, so that the air in the hollow cylinder can enter the sliding cavity, and the piston is pushed by the air, so that the piston slides in the sliding cavity, and the floating guide wheel moves toward the inner side of the fixed guide wheel, so that the cable can be in a relaxed state.

[0022] Furthermore, a ball is rotatably embedded in one end of the driving rod that penetrates into the conical groove, and the ball is in rolling contact with the inner wall of the conical groove.

[0023] Through the above technical solution, the balls roll on the inner wall of the tapered groove, so that the wear between the end of the driving rod and the inner wall of the tapered groove is reduced, and at the same time, large wear of the inner wall of the tapered groove is prevented.

[0024] Furthermore, the mouth of the hollow cylinder is provided with an inward-turned annular protrusion, and the annular protrusion is used to limit the sliding of the sliding block in the hollow cylinder.

[0025] Through the above technical solution, the annular protrusion limits the movement of the sliding block in the direction away from the support seat, thereby preventing the sliding block from escaping from the hollow cylinder.

[0026] The beneficial effects of the present invention are as follows: 1. In the present invention, the cable is clamped by the clamping sleeve, and the reset component generates a damping force on the pad when it slides on the top surface of the installation base plate, so that when the external control cabinet vibrates, the vibration force is transmitted to the main body, and the reset component damps the main body so that the main body can buffer. In addition, the cable is inserted into the clamping sleeve. When the main body is subjected to vibration, the main body and the clamping sleeve move synchronously, so that the clamping sleeve drives the cable to move synchronously. Since the positions of the clamping sleeve and the main body remain relatively unchanged, the cable always remains coaxial with the busbar hole of the main body. In addition, the expansion sleeve can produce elastic contraction and elastic expansion deformation. The expansion sleeve will enable the clamping sleeve to always maintain the clamping force on the cable, and when the cable is pulled, the two expansion sleeves produce corresponding elastic contraction deformation, thereby increasing the clamping force of the clamping sleeve on the cable, thereby increasing the resistance of the cable when being pulled, and making the cable located between the two clamping sleeves in a straight state, so that the coaxiality of the cable and the current transformer busbar hole is higher; 2. In the present invention, the scroll spring has elastic deformation capability, so that when the backing plate slides on the surface of the mounting base, the protrusion moves, thereby causing the scroll spring to deform. After the vibration force on the backing plate disappears, the scroll spring recovers its own deformation, thereby causing the protrusion to move to the center position of the inner ring of the scroll spring in the initial state, that is, driving the backing plate and the body to return to their initial state; 3. In the present invention, when the body is vibrated and moves, the drive unit is triggered to operate. The drive unit drives the piston to move in the sliding cavity, so that the piston can squeeze the air in the sliding cavity, and then the piston drives the connecting rod to move, so that the floating guide wheel moves toward the inner side of the fixed plate, thereby causing the cables wrapped around the two fixed guide wheels and the floating guide wheel to relax. This prevents the cables from being pulled on the outer sides of the two clamping sleeves due to the large tension when the body moves, so that the cables cannot be pulled on the body by movement to buffer the vibration. 4. In the present invention, when the main body moves due to vibration, the end of the driving rod will contact the inner wall of the conical groove and generate an extrusion force on the inner wall of the conical groove along the axial direction of the hollow cylinder, so that the sliding block moves in the sliding cavity toward the support seat, and then the sliding block squeezes the air in the hollow cylinder, so that the air in the hollow cylinder can enter the sliding cavity, and the piston is pushed by the air, so that the piston slides in the sliding cavity, and the floating guide wheel moves toward the inner side of the fixed guide wheel, so that the cable can be in a relaxed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a split-type current transformer in the present invention; Figure 2 yes Figure 1 Schematic diagram of the position relationship of the first perspective; Figure 3 yes Figure 1 Schematic diagram of the positional relationship of the second perspective; Figure 4 This is a schematic diagram of the positional relationship of the support seat, the fixing plate and the hollow cylinder after assembly in the present invention; Figure 5 yes Figure 4 Schematic diagram of the positional relationship after the middle part of the structure is cut open; Figure 6 yes Figure 5 A magnified schematic diagram of the local structure at point A; Figure 7 This is a schematic diagram of the positional relationship among the mounting base, the backing plate, and the main body after assembly in the present invention; Figure 8 yes Figure 7 Schematic diagram of the exploded structure; Figure 9 yes Figure 8 A schematic diagram of the positional relationship from another perspective; Figure 10 It is a structural diagram of the expansion sleeve in the present invention; Figure 11 yes Figure 10 Schematic diagram of the positional relationship from another perspective.

[0028] Figure markings: 1. Mounting base plate; 2. Fixed guide wheel; 3. Fixed plate; 4. Clamping sleeve; 5. Expanding sleeve; 6. Main body; 7. Pad; 8. Driving rod; 9. Floating guide wheel; 10. Hollow cylinder; 11. Support seat; 12. Deformation notch; 13. Stopper; 14. Second accommodating chamber; 15. Pipe interface; 16. Connecting rod; 17. Waist-shaped hole; 18. Sliding block; 19. Sliding chamber; 20. Piston; 21. Conical groove; 22. Ball; 23. Spring; 24. Connecting chamber; 25. Limit pin; 26. Volute spring; 27. Connecting hole; 28. First accommodating chamber; 29. ​​Protrusion. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figures 1-11As shown, this embodiment provides: a split-type current transformer, including a body 6 of the split-type current transformer, the body 6 is composed of an upper and lower part, and the upper and lower parts of the body 6 are hinged at one end and detachably connected at the other end by bolts, so that the upper and lower parts of the body 6 can be flipped along the hinge, and a pad 7 is installed at the bottom of the body 6 by screws, and the bottom of the pad 7 is abutted and connected with a mounting base 1, and the mounting base 1 is fixedly installed in an external control cabinet by screws, so that the body 6 is installed in the control cabinet, and the pad The bottom of the main body 6 is vertically fixed with a protrusion 29, and the top of the mounting base 1 is provided with a first accommodating cavity 28. The lower end of the protrusion 29 is inserted into the first accommodating cavity 28, and a volute spring 26 is installed in the first accommodating cavity 28. The end of the outer ring of the volute spring 26 is welded to the inner wall of the first accommodating cavity 28, and the end of the inner ring of the volute spring 26 is welded to the periphery of the protrusion 29, and the volute spring 26 is installed on the periphery of the protrusion 29 in a sleeve-wound manner, so that when the main body 6 is subjected to a lateral force, the main body 6 will drive the pad 7 to move, and the pad 7 will synchronously belt The movable protrusion 29 moves so that the protrusion 29 squeezes the volute spring 26, and the volute spring 26 begins to accumulate elastic potential energy. When the lateral force acting on the body 6 disappears, the elastic potential energy of the volute spring 26 itself is released, so that the protrusion 29 can be driven to move to the initial state. That is, when the protrusion 29 moves to the initial state, the inner circle of the volute spring 26 is located in the positive projection area of ​​the first accommodating cavity 28. In addition, the end face of the protrusion 29 is coaxially fixedly provided with a limit pin 25, and the mounting base 1 is provided with a free passage for the limit pin 25. The connecting hole 27 has an inner diameter larger than the outer diameter of the stop pin 25. The lower end of the stop pin 25 is fixedly sleeved with the stop portion 13. The bottom surface of the mounting base 1 is provided with a second accommodating cavity 14 for the stop portion 13 to freely pass through. The inner diameter of the second accommodating cavity 14 is larger than the outer diameter of the stop portion 13. When the body 6 is subjected to vibration, the stop portion 13 will move within the second accommodating cavity 14. Since the inner diameter of the second accommodating cavity 14 is larger than the outer diameter of the stop portion 13, the outer diameter of the stop pin 25 is smaller than the inner diameter of the connecting hole 27, thereby allowing the body 6 to move when subjected to vibration. The two axial end faces of the body 6 are installed with expansion sleeves 5 by means of screws. Specifically, the end of the expansion sleeve 5 in contact with the body 6 is provided with a circular ring portion, which abuts against the end face of the body 6 and is installed on the end face of the body 6 by means of screws. The outer diameter of the expansion sleeve 5 decreases in sequence in the direction away from the body 6. The clamping sleeve 4 is fixed to the end with the smallest outer diameter of the expansion sleeve 5. A plurality of deformation notches 12 that penetrate the inner cavity of the expansion sleeve 5 are provided on the periphery of the expansion sleeve 5. By setting the deformation notches 12, the expansion sleeve 5 will produce elastic contraction deformation when subjected to the extrusion force along its radial inner side, thereby making The opening of the clamping sleeve 4 is narrowed, so that the clamping sleeve 4 is in a clamping configuration. In addition, a plurality of deformation notches 12 are arranged in an array along the axial direction of the expansion sleeve 5, and the deformation notches 12 extend to the periphery of the clamping sleeve 4, so that the deformation amplitudes of the expansion sleeve 5 and the multiple parts of the clamping sleeve 4 divided by the plurality of deformation notches 12 tend to be consistent. In addition, a rubber layer (not shown in the figure) is provided on the inner wall surface of the clamping sleeve 4. The provision of the rubber layer increases the frictional resistance between the cable and the inner wall surface of the clamping sleeve 4, thereby preventing the cable from sliding within the clamping sleeve 4 and increasing the resistance to sliding of the cable within the clamping sleeve 4 when it is pulled. The mounting base 1 is provided with support seats 11 on both sides of the axial ends of the body 6, and the upper end of the support seat 11 is connected to a fixed plate 3. The upper surface of the fixed plate 3 is vertically rotatably connected to two fixed guide wheels 2 by installing bearings. The horizontal connection line of the two fixed guide wheels 2 is parallel to the axial direction of the body 6. A sliding cavity 19 is provided in the fixed plate 3. A piston 20 is coaxially mounted in the sliding cavity 19. The piston 20 slides freely horizontally in the sliding cavity 19, and a connecting rod 16 is fixed to the end face of the piston 20. One end of the connecting rod 16 passes through the top surface of the fixed plate 3 and is rotatably connected to a floating guide wheel 9. The floating guide wheel 9 is located between the two fixed guide wheels 2, a waist-shaped hole 17 is opened on the top surface of the fixed plate 3 for the free passage of the connecting rod 16. The cable is passed around a fixed guide wheel 2 away from the body 6, and then around the floating guide wheel 9, and then around a fixed guide wheel 2 adjacent to the body 6. The cable then passes through the clamping sleeve 4. After passing through the clamping sleeve 4, the cable passes through the busbar hole of the body 6, and then passes out from another clamping sleeve 4, and then passes around the two fixed guide wheels 2 and floating guide wheel 9 on the other side in sequence, and then the cable passes through the busbar hole of the body 6. When the cable moves toward the inner side of the fixed plate 3 through the floating guide wheel 9, the cable can be relaxed; The wall surface of the support seat 11 is fixedly connected with the hollow cylinder 10 horizontally, and a sliding block 18 is coaxially mounted in the hollow cylinder 10. The sliding block 18 slides freely in the hollow cylinder 10, and a connecting cavity 24 is formed between the sliding block 18 and the inner wall of the hollow cylinder 10. A spring 23 is horizontally mounted in the connecting cavity 24. The two ends of the spring 23 elastically press against the sliding block 18 and the inner wall of the connecting cavity 24 respectively. A pipe interface 15 is provided on the wall surface of the hollow cylinder 10, and an air pipe is installed on the pipe interface 15. The end of the air pipe away from the hollow cylinder 10 is mounted on the fixed plate. 3, and is connected to the inner cavity of the sliding cavity 19, the sliding block 18 is coaxially provided with a tapered groove 21 on one side end surface facing the body 6, the inner diameter of the tapered groove 21 increases in sequence in the direction away from the support seat 11, the wall surface of the body 6 is horizontally connected to the driving rod 8, the end of the driving rod 8 away from the body 6 is inserted into the tapered groove 21, the outer diameter of the driving rod 8 is smaller than the minimum inner diameter of the tapered groove 21, and when the body 6 is moved by vibration, the end of the driving rod 8 will contact the inner wall of the tapered groove 21 and produce an axial force on the inner wall of the tapered groove 21 along the axial direction of the hollow cylinder 10 The extrusion force causes the sliding block 18 to move in the sliding cavity 19 toward the support seat 11, thereby causing the sliding block 18 to squeeze the air in the hollow cylinder 10, so that the air in the hollow cylinder 10 can enter the sliding cavity 19, and the piston 20 is pushed by the air, thereby causing the piston 20 to slide in the sliding cavity 19, and causing the floating guide wheel 9 to move toward the inner side of the fixed guide wheel 2, thereby allowing the cable to be in a relaxed state. The end of the driving rod 8 that penetrates the tapered groove 21 is rotatably embedded with a ball 22. The ball 22 is in rolling contact with the inner wall of the conical groove 21, and the ball 22 rolls on the inner wall of the conical groove 21, so that the wear between the end of the driving rod 8 and the inner wall of the conical groove 21 is small, and the inner wall of the conical groove 21 is also prevented from being worn out. The mouth of the hollow cylinder 10 is provided with an inward-turned annular protrusion, which is used to limit the sliding of the sliding block 18 in the hollow cylinder 10. The annular protrusion limits the movement of the sliding block 18 away from the support seat 11, thereby preventing the sliding block 18 from escaping from the hollow cylinder 10.

[0031] The working principle of this embodiment is as follows: The cable is passed around a fixed guide wheel 2 away from the body 6, and then around the floating guide wheel 9, and then around a fixed guide wheel 2 adjacent to the body 6, and then the cable passes through the clamping sleeve 4, and after passing through the clamping sleeve 4, the cable passes through the busbar hole of the body 6, and then passes through another clamping sleeve 4, and then passes around the two fixed guide wheels 2 and floating guide wheel 9 on the other side in turn, so that the cable passes through the busbar hole of the body 6. The staff pulls the cable by hand so that the cable is straightened on the expansion sleeve 5 and the clamping sleeve 4. When pulling, the two expansion sleeves 5 can be expanded with external tools so that the two expansion sleeves 5 are straightened. The expansion sleeve 5 can produce elastic expansion deformation along its radial outer side, thereby causing the clamping sleeve 4 to also be in an expanded state, so that the resistance of the cable when sliding in the clamping sleeve 4 is small. After the cable passes through, the expansion sleeve 5 is loosened, and the expansion sleeve 5 recovers through its own elastic deformation, so that the expansion sleeve 5 changes from elastic expansion deformation to elastic contraction deformation, and the clamping sleeve 4 clamps the cable. The inner wall of the clamping sleeve 4 is provided with a rubber layer, which makes the friction resistance between the cable and the inner wall of the clamping sleeve 4 large, thereby preventing the cable from sliding on its own in the clamping sleeve 4, and increasing the resistance of the cable to sliding in the clamping sleeve 4 when the cable is pulled; When the main body 6 is subjected to vibration, the stopper 13 will move in the second accommodating chamber 14, and since the inner diameter of the second accommodating chamber 14 is larger than the outer diameter of the stopper 13, the outer diameter of the limit pin 25 is smaller than the inner diameter of the connecting hole 27, thereby enabling the main body 6 to move when subjected to vibration. When the main body 6 is subjected to a lateral force, the main body 6 will drive the pad 7 to move, and the pad 7 will synchronously drive the protrusion 29 to move, so that the protrusion 29 squeezes the volute spring 26, and the volute spring 26 will begin to accumulate elastic potential energy. When the lateral force acting on the main body 6 disappears, the elastic potential energy of the volute spring 26 itself is released, so that the protrusion 29 can be driven to move to the initial state, that is, when the protrusion 29 moves to the initial state, the inner ring of the volute spring 26 is located in the positive projection area position in the first accommodating chamber 28, thereby enabling the external control cabinet to be subjected to a large impact and generate vibration. After the vibration is transmitted to the main body 6, the volute is squeezed through the protrusion 29. The coil spring 26 can buffer the main body 6 and restore the main body 6 to its original state after the vibration force disappears. In addition, since the positions of the clamping sleeve 4 and the main body 6 remain relatively unchanged, the cable always remains coaxial with the busbar hole of the main body 6. In addition, the expansion sleeve 5 can produce elastic contraction and elastic expansion deformation. The expansion sleeve 5 will make the clamping sleeve 4 always maintain its clamping force on the cable, and when the cable is pulled, the two expansion sleeves 5 produce corresponding elastic contraction deformation, thereby increasing the clamping force of the clamping sleeve 4 on the cable, thereby increasing the resistance of the cable when being pulled, and making the cable located between the two clamping sleeves 4 in a straight state, so that the coaxiality of the cable and the busbar hole of the current transformer main body 6 is high. In this way, the cable and the busbar hole remain coaxial when the main body 6 is vibrated and moved. Maintaining the coaxiality of the cable and the busbar hole helps to ensure uniform current distribution, thereby reducing the unevenness of the magnetic field and improving measurement accuracy. Especially in the case of high frequency or large current, the eccentricity of the cable may cause uneven magnetic field distribution, resulting in measurement errors; When the main body 6 moves due to vibration, the end of the driving rod 8 will contact the inner wall of the conical groove 21 and generate an extrusion force on the inner wall of the conical groove 21 along the axial direction of the hollow cylinder 10, so that the sliding block 18 moves in the sliding cavity 19 toward the support seat 11, and then the sliding block 18 squeezes the air in the hollow cylinder 10, so that the air in the hollow cylinder 10 can enter the sliding cavity 19, and the piston 20 is pushed by the air, and then the piston 20 slides in the sliding cavity 19, and the floating guide wheel 9 moves toward the inner side of the fixed guide wheel 2, so that the cable can be in a relaxed state. In this way, when the main body 6 moves due to vibration, the cable relaxes, thereby avoiding the movement of the main body 6 and pulling the cable, so that the cable interferes with the movement of the main body 6, and the buffering damping effect of the main body 6 when it is subjected to vibration is reduced.

[0032] 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 split-type current transformer, comprising a body (6) of the split-type current transformer, characterized in that: Also includes: A backing plate (7) is detachably connected to the bottom of the body (6), the bottom of the backing plate (7) is in contact with the mounting base plate (1), and the backing plate (7) slides freely on the top surface of the mounting base plate (1); A reset component is provided on the mounting base plate (1), and is used to generate a damping force when the backing plate (7) slides on the top surface of the mounting base plate (1); Two expansion sleeves (5) are provided and are respectively connected to the axial end faces of the main body (6). The outer diameter of the expansion sleeve (5) decreases in sequence in the direction away from the main body (6). The end with the smallest outer diameter of the expansion sleeve (5) is fixedly connected to the clamping sleeve (4). The periphery of the expansion sleeve (5) is provided with a plurality of deformation notches (12) penetrating the inner cavity of the expansion sleeve (5).

2. A split-type current transformer according to claim 1, characterized in that: The reset assembly includes a protrusion (29) fixed to the bottom of the backing plate (7), a first accommodating cavity (28) is opened on the top of the mounting base (1), the protrusion (29) extends downward into the first accommodating cavity (28), a volute spring (26) is installed in the first accommodating cavity (28), the inner ring of the volute spring (26) is fixedly sleeved on the periphery of the protrusion (29), and the outer ring end of the volute spring (26) is fixedly connected to the inner wall of the first accommodating cavity (28).

3. A split-type current transformer according to claim 2, characterized in that: The protrusion (29) is coaxially fixedly provided with a limit pin (25), the mounting base (1) is provided with a connecting hole (27) for the limit pin (25) to pass freely, the inner diameter of the connecting hole (27) is larger than the outer diameter of the limit pin (25), the lower end of the limit pin (25) is fixedly sleeved with a stop portion (13), the bottom surface of the mounting base (1) is provided with a second accommodating cavity (14) for the stop portion (13) to pass freely, the inner diameter of the second accommodating cavity (14) is larger than the outer diameter of the stop portion (13).

4. A split-type current transformer according to claim 1, characterized in that: The plurality of deformation notches (12) are arranged in an axial array along the expansion sleeve (5), and the deformation notches (12) extend to the periphery of the clamping sleeve (4).

5. The split-type current transformer according to claim 1, characterized in that: The inner wall surface of the clamping sleeve (4) is provided with a rubber layer.

6. A split-type current transformer according to claim 1, characterized in that: The mounting base (1) is provided with support seats (11) on both sides of the axial ends of the corresponding body (6), and the upper end of the support seat (11) is connected to a fixing plate (3), and a relaxation component is provided on the top of the fixing plate (3).

7. A split-type current transformer according to claim 6, characterized in that: The relaxation component includes two fixed guide wheels (2) vertically rotatably connected to the upper surface of the fixed plate (3), the horizontal connecting line of the two fixed guide wheels (2) is parallel to the axial direction of the body (6), a sliding cavity (19) is provided in the fixed plate (3), a piston (20) is coaxially mounted in the sliding cavity (19), the piston (20) slides freely horizontally in the sliding cavity (19), and the end face of the piston (20) is fixed with a connecting rod (16), one end of the connecting rod (16) passing through the top surface of the fixed plate (3) is rotatably connected to a floating guide wheel (9), the floating guide wheel (9) is located between the two fixed guide wheels (2), the top surface of the fixed plate (3) is provided with a waist-shaped hole (17) for the connecting rod (16) to pass freely, and the support seat (11) is provided with a driving unit for driving the piston (20) to move in the sliding cavity (19).

8. A split-type current transformer according to claim 7, characterized in that: The driving unit comprises a hollow cylinder (10) fixed to the wall of the support seat (11), a sliding block (18) is coaxially mounted in the hollow cylinder (10), the sliding block (18) slides freely in the hollow cylinder (10), and a communicating cavity (24) is formed between the sliding block (18) and the inner cavity wall of the hollow cylinder (10); A spring (23) is horizontally installed in the communication cavity (24), and the two ends of the spring (23) in the elastic direction elastically press against the sliding block (18) and the inner wall of the communication cavity (24), respectively. An air pipe is installed on the wall of the hollow cylinder (10), and the end of the air pipe away from the hollow cylinder (10) is installed on the fixed plate (3) and is connected to the inner cavity of the sliding cavity (19). A conical groove (21) is coaxially opened on the end surface of one side of the sliding block (18) facing the body (6), and the inner diameter of the conical groove (21) increases in sequence in the direction away from the support seat (11); The wall surface of the body (6) is horizontally connected to a driving rod (8), and one end of the driving rod (8) away from the body (6) penetrates into the conical groove (21). The outer diameter of the driving rod (8) is smaller than the minimum inner diameter of the conical groove (21).

9. A split-type current transformer according to claim 8, characterized in that: One end of the driving rod (8) that penetrates into the tapered groove (21) is rotatably embedded with a ball (22), and the ball (22) is in rolling contact with the inner wall of the tapered groove (21).

10. The split-type current transformer according to claim 8, characterized in that: The mouth of the hollow cylinder (10) is provided with an inverted annular protrusion, and the annular protrusion is used to limit the sliding of the sliding block (18) in the hollow cylinder (10).

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