A 20 kV wide-range current transformer

Abstract

The present invention discloses a 20 kV wide-range current transformer, which includes a current transformer body. A wire-passing part for the busbar to penetrate through is arranged at the central position inside the current transformer body. Back rings are fixed on the front and rear outer walls of the current transformer body, and a front ring seat is slidably installed on the outer wall of the back ring away from the current transformer body. A plurality of elastic reset structures are arranged between the opposite outer walls of the front ring seat and the back ring. The present invention uses a screw rod pressing structure to gradually move the front ring seat closer to the back ring, which can effectively support and limit the busbar. During this process, no external components are introduced into the wire-passing part of the wide-range current transformer, eliminating any possible interference sources. This clear measurement environment helps to improve the response speed and sensitivity of the transformer, ensuring that when transient changes occur in the power system, the transformer can timely and accurately reflect the changes in current.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, and specifically to a 20 kV wide-range current transformer. Background Art

[0002] A 20 kV wide-range current transformer is a key power equipment, mainly used for measuring and protecting current in a high-voltage power system. Its main function is to convert the current signal of high voltage and high current into a low voltage and low current signal for subsequent use by monitoring, measuring and protection equipment. A 20 kV wide-range current transformer mainly consists of several parts such as an iron core, windings, insulating materials and a housing. The iron core is usually made of high-permeability material to concentrate and guide magnetic flux to ensure the accuracy of measurement. The windings of the transformer are divided into a primary winding and a secondary winding. The primary winding is connected to the high-voltage circuit, and the secondary winding outputs a low current signal. By reasonably designing the turn ratio of these two windings, the current can be stepped down, so as to convert the high current into a measurable low current signal. Insulating materials are used to ensure the safety of the transformer in a high-voltage environment and prevent electrical breakdown and leakage. The housing provides mechanical protection to ensure the stable operation of the equipment in various environments;

[0003] For example, a wire threading structure of a current transformer disclosed in the authorized announcement number CN222015206U includes a transformer body. A wire threading hole is provided in the middle of the surface of the transformer body. A busbar is inserted into the wire threading hole. A wire threading clamping mechanism for clamping and fixing the busbar is provided in the wire threading hole. The wire threading clamping mechanism includes a chute, a slider, a connecting block and a clamping block. A plurality of chutes are evenly opened on the outer surface of the transformer body. The slider is movably engaged in the chute. The connecting block is fixedly provided on the outer surface of the slider. It adds a wire threading clamping mechanism in the traditional through-core current transformer, so that the busbar can be clamped and fixed, effectively reducing the swing of the busbar caused by vibration and avoiding unnecessary frictional losses. However, in the above technical solution, during use, the cable is mainly supported by several clamping blocks inserted into the wire threading hole of the current transformer. However, the clamping blocks have entered the interior of the current transformer and are located outside the cable. The working principle of the wide-range current transformer is based on the electromagnetic induction law. The current flowing in the primary winding generates a magnetic field, and a low current signal proportional to the primary current is induced in the secondary winding. However, the presence of the clamping blocks will affect the distribution and intensity of the magnetic field. When the clamping blocks hinder the uniform distribution of the magnetic field, it is easy to cause the current signal induced in the secondary winding to no longer be proportional to the primary current, thus introducing measurement errors. And if the material of the clamping blocks has high magnetic permeability, it will also cause distortion of the magnetic field, resulting in inaccurate measurement results.

[0004] When impurities adhere to the outer surface of the busbar, the cylindrical head presses against the outside of the busbar. Due to the presence of impurities, the pressure of the cylindrical head on the busbar is likely to cause damage to the busbar. Moreover, the busbar itself has weight. When three cylindrical heads are used to support the busbar, the position of the busbar is likely to be lower, which is likely to cause errors in the measurement results. At the same time, when there are depressions on the surface of the busbar, it will also affect the position of the busbar at the wire-passing part. Summary of the Invention

[0005] The purpose of the present invention is to provide a 20 kV wide-range current transformer. The energized busbar to be measured passes through the wide-range current transformer, and a back ring with a number of ejector rods is fixed on both the front and rear outer walls of the wide-range current transformer. The front ring seat is forced to gradually approach the back ring by a screw pressing structure. Due to the presence of the ejector rods, the lever-type self-resetting wire supporting assembly will be pushed, and then a number of lever-type self-resetting wire supporting assemblies on the front ring seat apply force in the radial direction of the busbar, so that the busbar is supported and limited, and the busbar is concentric with the wire-passing hole of the wide-range current transformer. At this time, there are no obstacles in the wire-passing hole of the wide-range current transformer, only the busbar exists, so as to solve the problems proposed in the above background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A 20 kV wide-range current transformer, comprising:

[0007] A current transformer body, a wire-passing part for the busbar to pass through is arranged at the central position inside the current transformer body. Back rings are fixed on both the front and rear outer walls of the current transformer body, and a front ring seat is slidably installed on the outer wall of the back ring away from the current transformer body. A number of elastic reset structures are arranged between the opposite outer walls of the front ring seat and the back ring;

[0008] A lever-type self-resetting wire supporting assembly, the quantity and position of the lever-type self-resetting wire supporting assembly correspond to the elastic reset structure one by one. The lever-type self-resetting wire supporting assembly is installed on the outer wall of the front ring seat away from the back ring. A number of the lever-type self-resetting wire supporting assemblies are used to apply radial force to the busbar in the wire-passing part during the process of the front ring seat approaching the back ring;

[0009] A single-rail type bottom plate, the single-rail type bottom plate is fixed at the bottom end of the current transformer body, and the extending direction of the single-rail type bottom plate is parallel to the extension line of the central axis of the wire-passing part. Screw pressing structures for driving the front ring seat to approach the back ring are installed on both sides of the top end of the single-rail type bottom plate.

[0010] Preferably, hole-connected feet are fixed at the bottom ends of the current transformer body on both sides of the single-rail type bottom plate, and U-shaped notch grooves are arranged on the outer walls of the two hole-connected feet away from each other in the same X-axis direction.

[0011] Preferably, the elastic reset structure is a ejector rod fixed inside the back ring and a reset spring wound around one end of the surface of the ejector rod. A counterbore for the ejector rod to pass through and contact the lever type self-resetting wire supporting assembly is arranged inside the front ring seat, and one end of the reset spring contacts the back surface of the front ring seat.

[0012] Preferably, a guide pin is fixed on the back surface of the front ring seat. One end of the guide pin away from the front ring seat extends into the inside of the back ring, and the guide pin and the back ring are in sliding fit.

[0013] Preferably, a plurality of arc-shaped holding plates are integrally formed on the outer edge of the front ring seat. The inner diameter of the arc-shaped holding plate is equal to the outer diameter of the back ring, and the inner wall of the arc-shaped holding plate and the outer wall of the back ring are in sliding fit.

[0014] Preferably, the lever type self-resetting wire supporting assembly includes a T-shaped shaft frame fixed on the outer wall of one side of the front ring seat, a hinge shaft rotatably installed inside the T-shaped shaft frame, and a bent arm fixed on one end of the surface of the hinge shaft. One end of the hinge shaft penetrates to the outside of the T-shaped shaft frame and is fixed with a retaining disc. A torsion spring is installed on the outer peripheral surface of the hinge shaft between the retaining disc and the T-shaped shaft frame. Two ends of the torsion spring are respectively clamped with the outer wall of one side of the T-shaped shaft frame and the outer wall of the retaining disc, and one end of the bent arm contacts one end of the ejector rod.

[0015] Preferably, rectangular notch parts for the end part of the torsion spring to be embedded are arranged on the outer wall of one side of the T-shaped shaft frame and the outer wall of the retaining disc.

[0016] Preferably, the bent arm is made of a component of hard plastic material. An electric control telescopic part is arranged on the side of the bent arm away from the hinge shaft. The output end of the electric control telescopic part is provided with a pressure rod. The end of the pressure rod is provided with a cylindrical head. A pressure sensor is arranged on the side of the bent arm close to the ejector rod. A gas spraying hole is arranged on the cylindrical head, and the gas spraying hole is connected with an external air supply pump.

[0017] Preferably, the screw rod pressing structure includes a threaded shaft installed on the outer wall of one side of the single-rail type bottom plate through a nut pair, a table plate slidably installed at the top of the single-rail type bottom plate, and a U-shaped connecting arm extending upward and fixed on one side of the top of the table plate. One end of the threaded shaft is rotatably connected with the outer wall of one side of the table plate, and the outer wall of one side of the U-shaped connecting arm is fixedly connected with the outer wall of one side of the front ring seat.

[0018] Preferably, a sliding sleeve is fixed at the bottom end of the table plate, and the bottom end of the sliding sleeve and the top end of the single-rail type bottom plate are in sliding fit.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. By using the screw rod crimping structure to gradually move the front ring seat closer to the back ring, effective support and limit of the busbar can be achieved. During this process, no external components are introduced into the wire threading part of the wide-range current transformer, eliminating any possible interference sources. This clear measurement environment helps improve the response speed and sensitivity of the transformer.

[0021] 2. When the busbar is accurately positioned in the wire threading part of the wide-range current transformer, the radial force exerted by the lever-type self-resetting wire supporting assembly of the front ring seat can ensure that the busbar always remains in the ideal central position, thereby reducing measurement errors caused by eccentricity. This precise positioning can effectively improve the reliability of current measurement.

[0022] 3. Through the design of using the ejector rod and the lever-type self-resetting wire supporting assembly, the busbar can be firmly supported and limited, reducing mechanical stress caused by improper installation. This design can not only extend the service life of the busbar and the transformer, but also reduce the risk of failures caused by mechanical losses, ensuring the long-term stable operation of the equipment.

[0023] 4. By setting up components such as pressure sensors, electro-controlled telescopic parts, bending arms, air nozzles, and external air supply pumps, through the cooperation between various pressure sensors, the equipment can judge the position of the busbar and adjust it through the electro-controlled telescopic parts. Moreover, the equipment can judge impurities or depressions on the outside of the busbar, and then clean the impurities on the outside of the busbar by jetting air through the air nozzles, and increase the clamping effect of the cylindrical head on the busbar according to the degree of the depression or remind the staff to replace the busbar in time. Also, when the equipment is impacted and vibrated, the clamping force on the busbar can be increased to ensure the stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the front view structural schematic diagram of the present invention;

[0025] Figure 2 is the side view structural schematic diagram of the present invention;

[0026] Figure 3 is the three-dimensional structural schematic Figure 1 ;

[0027] Figure 4 is the three-dimensional structural schematic Figure 2 ;

[0028] Figure 5 is the three-dimensional structural schematic Figure 3 ;

[0029] Figure 6 is the three-dimensional structural schematic diagram of the front ring seat of the second embodiment of the present invention;

[0030] Figure 7Schematic three-dimensional structure diagram of the lever-type self-resetting wire supporting assembly according to the second embodiment of the present invention;

[0031] Figure 8 Schematic three-dimensional structure diagram of the single-rail type bottom plate according to the third embodiment of the present invention.

[0032] In the figure: 1, current transformer body; 2, back ring; 3, front ring seat; 301, arc-shaped clamping plate; 302, guide pin; 303, counterbore; 4, ejector rod; 5, lever-type self-resetting wire supporting assembly; 501, T-shaped shaft frame; 502, hinge shaft; 503, bent arm; 504, retaining disc; 5041, rectangular notch part; 505, torsion spring; 506, electric control telescopic member; 507, pressure rod; 6, wire threading part; 7, single-rail type bottom plate; 8, screw rod pressing structure; 801, threaded shaft; 802, table plate; 803, U-shaped connecting arm; 9, return spring; 10, connecting foot with hole. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] As Figures 1 to 5 shown, a 20 kV wide-range current transformer of the present invention includes a current transformer body 1. A wire threading part 6 through which a bus bar passes through is provided at the central position inside the current transformer body 1. The bus bar is passed through the wire threading part 6 of the current transformer body 1 to ensure that the bus bar can pass through smoothly without any obstruction. Back rings 2 are fixed on the front and rear outer walls of the current transformer body 1, and a front ring seat 3 is slidably installed on the outer wall of the back ring 2 away from the current transformer body 1. A plurality of elastic reset structures are provided between the opposite outer walls of the front ring seat 3 and the back ring 2.

[0036] The lever-type self-resetting wire supporting assemblies 5, the number and positions of the lever-type self-resetting wire supporting assemblies 5 correspond one-to-one with the elastic reset structures. The lever-type self-resetting wire supporting assemblies 5 are installed on the outer wall of the front ring seat 3 away from the back ring 2. A plurality of lever-type self-resetting wire supporting assemblies 5 are used to apply a radial force to the bus bar in the wire threading part 6 when the front ring seat 3 approaches the back ring 2.

[0037] The single-rail type bottom plate 7 is fixed at the bottom end of the current transformer body 1. Connecting feet 10 with holes are fixed on both sides of the bottom end of the current transformer body 1 of the single-rail type bottom plate 7. U-shaped notch grooves are provided on the outer walls of the two connecting feet 10 with holes on the same X-axis direction away from each other.

[0038] The extending direction of the single-rail type bottom plate 7 is parallel to the extension line of the central axis of the wire threading part 6. On both sides of the top end of the single-rail type bottom plate 7, a screw rod pressing structure 8 for driving the front ring seat 3 to approach the back ring 2 is installed. By using the screw rod pressing structure 8 to gradually adjust the position of the front ring seat 3, that is, by rotating the screw rod, the front ring seat 3 can be gradually moved closer to the direction where the back ring 2 is located.

[0039] After the elastic reset structure contacts the lever type self-resetting wire supporting assembly 5, the busbar can automatically be concentrically centered and reset with the wire threading part 6 and remain in the central position to ensure that the busbar can still remain stable when being disturbed externally.

[0040] The elastic reset structure is a ejector rod 4 fixed inside the back ring 2 and a reset spring 9 wound around one end of the surface of the ejector rod 4. Inside the front ring seat 3, a counterbore 303 is provided for the ejector rod 4 to pass through and contact the lever type self-resetting wire supporting assembly 5. One end of the reset spring 9 contacts the back surface of the front ring seat 3. When operating the screw rod pressing structure 8 to drive the front ring seat 3 to approach the back ring 2, the ejector rod 4 will gradually eject from the counterbore 303 of the front ring seat 3 and contact the lever type self-resetting wire supporting assembly 5, and then force the lever type self-resetting wire supporting assembly 5 to perform a wire clamping action. During this process, the reset spring 9 will be gradually compressed and deformed due to the movement of the front ring seat 3.

[0041] When the moving end of the screw rod pressing structure 8 is in a fixed connection state with the front ring seat 3, the screw rod pressing structure 8 can drive the front ring seat 3 to move away from the back ring 2, and use the relative position between the front ring seat 3 and the back ring 2 to indirectly control the clamping force of the lever type self-resetting wire supporting assembly 5 on the busbar, and it is applicable to busbars with different diameter specifications.

[0042] A guide pin 302 is fixed on the back surface of the front ring seat 3. One end of the guide pin 302 away from the front ring seat 3 extends into the inside of the back ring 2. The guide pin 302 and the back ring 2 are in sliding fit. During the process of the front ring seat 3 approaching or moving away from the back ring 2, the guide pin 302 can slide relatively inside the back ring 2, that is, the guide pin 302 can effectively guide the movement of the front ring seat 3 and reduce its lateral displacement during installation and use.

[0043] A plurality of arc-shaped holding plates 301 are integrally formed on the outer edge of the front ring seat 3. The inner diameter of the arc-shaped holding plates 301 is equal to the outer diameter of the back ring 2. The inner wall of the arc-shaped holding plates 301 and the outer wall of the back ring 2 are in sliding fit. The arc-shaped holding plates 301 provide additional support to make the front ring seat 3 more stable when bearing the busbar load. This enhancement of the bearing capacity helps to maintain the wire supporting stability of the structure under high current or vibration conditions.

[0044] consisting of Figure 6 and Figure 7As shown, the lever - type self - resetting wire - supporting assembly 5 includes a T - shaped shaft bracket 501 fixed on the outer wall of one side of the front ring base 3, a hinge shaft 502 rotatably installed inside the T - shaped shaft bracket 501, and a bent arm 503 fixed at one end of the surface of the hinge shaft 502. One end of the hinge shaft 502 penetrates to the outside of the T - shaped shaft bracket 501 and is fixed with a retaining disc 504. A torsion spring 505 is installed on the outer peripheral surface of the hinge shaft 502 between the retaining disc 504 and the T - shaped shaft bracket 501. The two ends of the torsion spring 505 are respectively clamped with the outer wall of one side of the T - shaped shaft bracket 501 and the outer wall of the retaining disc 504. One end of the bent arm 503 is in contact with one end of the ejector rod 4.

[0045] When the busbar is introduced into the wire - passing part 6 of the current transformer body 1, the bent arm 503 is connected to the T - shaped shaft bracket 501 through the hinge shaft 502. As the front ring base 3 slides, the end of the ejector rod 4 will force the bent arm 503 to deflect. Due to the design of the bent arm 503, the force applied to the busbar is radial, and this force ensures that the busbar is closely attached to the wire - passing part 6 of the current transformer.

[0046] Rectangular notch parts 5041 for the ends of the torsion spring 505 to be embedded are provided on the outer wall of one side of the T - shaped shaft bracket 501 and the outer wall of the retaining disc 504. During the process of the torsion spring 505 restraining the deflection of the bent arm 503, the two ends of the torsion spring 505 are respectively hooked on the outer wall of the T - shaped shaft bracket 501 and the outer wall of the retaining disc 504, and the rectangular notch parts 5041 are for the ends of the torsion spring 505 to be embedded, so that the torsion spring 505 can deform in time and generate elastic force.

[0047] The bottom end of the bent arm 503 is provided with a cylindrical head. The bent arm 503 is made of a hard - plastic material component. In the case of current change or external disturbance, the busbar may be affected by external forces, resulting in a change in its position. Due to the lever action of the bent arm 503 and the existence of the torsion spring 505, the bent arm 503 can quickly adjust its position to continue applying a clamping force to the busbar. This dynamic response ability ensures the stability of the current transformer under various working conditions.

[0048] As shown Figure 8 As shown, the screw - press connection structure 8 includes a threaded shaft 801 installed on the outer wall of one side of the single - rail type bottom plate 7 through a nut pair, a table plate 802 slidably installed at the top of the single - rail type bottom plate 7, and a U - shaped connecting arm 803 fixed on one side of the top of the table plate 802 and extending upward. One end of the threaded shaft 801 is rotatably connected to the outer wall of one side of the table plate 802. One outer wall of the U - shaped connecting arm 803 is fixedly connected to the outer wall of one side of the front ring base 3. A sliding sleeve is fixed at the bottom end of the table plate 802, and the bottom end of the sliding sleeve is in sliding fit with the top of the single - rail type bottom plate 7.

[0049] The staff drives the threaded shaft 801 to rotate through the plum blossom knob, and the threaded shaft 801 will drive the table 802 and the U-shaped connecting arm 803 to slide in the extension direction of the monorail base plate 7, so that the U-shaped connecting arm 803 can drive the front ring seat 3 to approach the back ring 2 and force the push rod 4 to support the bending arm 503. The linear movement provided by the screw crimping structure 8 enables the front ring seat 3 to be accurately positioned and fixed, and the structural design of the threaded shaft 801 enables the front ring seat 3 to maintain its position when subjected to external force or vibration, thereby ensuring the reliability of the equipment in various working environments.

[0050] When the embodiment of the present application is used, first, before installing the current transformer body 1, sufficient preparation work is required, that is, checking various components, including the current transformer body 1, the back ring 2, the elastic reset structure, the front ring seat 3, the screw crimping structure 8 and the lever-type self-reset wire support assembly 5, to ensure that they are intact. Secondly, confirm the size and specification of the busbar to ensure that it can smoothly pass through the threading part 6 of the current transformer body 1. After the preparation work is completed, the position of the current transformer body 1 is determined to ensure that its installation position meets the design requirements of the power system. Next, the busbar is passed through the threading part 6 of the current transformer body 1 to ensure that the busbar can pass smoothly without any hindrance. After the busbar passes through the current transformer body 1, the staff uses the screw crimping structure 8 to gradually adjust the position of the front ring seat 3, that is, by rotating the screw, the front ring seat 3 can be gradually moved closer to the direction of the back ring 2. In this process, the elastic reset structure moves forward relative to the front ring seat 3 and contacts with the lever-type self-reset wire support assembly 5 of the front ring seat 3. The design of the elastic reset structure The design enables the lever-type self-resetting wire-supporting assembly 5 to apply force in the radial direction of the busbar, thereby firmly supporting the busbar in a predetermined position. After the elastic reset structure contacts the lever-type self-resetting wire-supporting assembly 5, the busbar can automatically reset concentrically with the threading portion 6 and remain in the center position to ensure that the busbar can remain stable when subjected to external disturbances, avoiding displacement or eccentricity, thereby improving the accuracy of measurement. Through the above steps, the busbar is fixed in the threading portion 6 of the current transformer body 1 to ensure that it is concentric with the transformer. The lever-type self-resetting wire-supporting assembly 5 applies a force through the push rod 4, which not only supports the busbar, but also effectively limits the position to avoid displacement of the busbar due to external forces. At this time, the stability of the busbar is significantly improved, and the current transformer body 1 can accurately sense the current changes in the busbar. After the installation is completed, the entire structure needs to be checked and verified again to ensure that all components have been correctly installed and tightened. The staff can observe the output signal of the current transformer by applying a certain current to verify the accuracy and stability of its measurement.

[0051] Embodiment 2

[0052] A 20kV wide-range current transformer proposed based on the above embodiments. During its use, when impurities adhere to the outer surface of the busbar, the cylindrical head presses against the outside of the busbar. Due to the presence of impurities, the pressure of the cylindrical head on the busbar is likely to cause damage to the busbar. Moreover, the busbar itself has weight. When three cylindrical heads are used to support the busbar, the position of the busbar is likely to be on the lower side, which is likely to cause errors in the measurement results. At the same time, when there are depressions on the surface of the busbar, it will also affect the position of the busbar at the wire-passing part 6, thereby affecting the measurement result. Therefore, the following solutions are made:

[0053] As Figures 1 to 8 shown, on the side of the bending arm 503 away from the hinge shaft 502, an electrically controlled telescopic member 506 is provided. The output end of the electrically controlled telescopic member 506 is provided with a pressure rod 507, and a cylindrical head is provided at the end of the pressure rod 507. On the side of the bending arm 503 close to the ejector rod 4, a pressure sensor is provided. A gas ejection hole is provided on the cylindrical head, and the gas ejection hole is connected to an external air supply pump. With the assistance of the electrically controlled telescopic member 506, the position of the cylindrical head can be electrically controlled and adjusted, making the position of the busbar at the wire-passing part 6 more accurate. With the assistance of the pressure sensor, the pressure between the cylindrical head and the busbar can be indirectly detected. Then, by comparing the detected values of the pressure sensors in three directions, the position of the busbar can be indirectly judged. After starting the external air supply pump, the gas ejection hole will eject gas, and under the action of the ejected gas, the impurities on the outside of the busbar can be cleaned, thereby ensuring the stability of the clamping of the busbar.

[0054] During the use of the present invention, during the process of the busbar passing through the wire-passing part 6 and being clamped by the present invention, as the threaded shaft 801 rotates, the U-shaped connecting arm 803 moves towards the current transformer body 1, and the bending arm 503 will come into contact with the ejector rod 4, and then the detected value of the pressure sensor starts to increase.

[0055] At this time, through the collaborative detection of the pressure sensors on the three bending arms 503, if the growth rate of the detected values of the two lower pressure sensors is greater than that of the upper pressure sensor, it indicates that the weight of the busbar passing through the wire-passing part 6 is relatively large, and thus the pressure generated by the busbar on the two lower bending arms 503 is large. At this time, the position of the busbar at the wire-passing part 6 will be biased downward. Therefore, the device controls the electrically controlled telescopic members 506 corresponding to the two lower pressure sensors to start, and the output ends of the two lower electrically controlled telescopic members 506 extend, so that the two lower pressure rods 507 act together to lift the busbar upward, so that the busbar is located at the center of the wire-passing part 6, making the measurement of the current transformer body 1 of the device more accurate.

[0056] During the movement of the U-shaped connecting arm 803, the cylindrical head slides on the busbar. If there are impurities on the busbar, when the cylindrical head passes through the impurities, the bending arm 503 will deflect, which will increase and fluctuate the detection value of the pressure sensor corresponding to the bending arm 503. Therefore, when the detection value of the pressure sensor slightly increases and fluctuates, the device determines that there are impurities on the surface of the busbar. At this time, the device controls the external air supply pump to make the air jet holes on the cylindrical head eject gas. The gas ejected from the air jet holes will clean the impurities on the surface of the busbar, ensuring that the busbar will not be clamped and damaged, and making the use of the device more stable.

[0057] During the movement of the U-shaped connecting arm 803, the cylindrical head slides on the busbar. If there are dents or defects on the busbar, when the cylindrical head passes through the dents or defects, the bending arm 503 will deflect, which will decrease and fluctuate the detection value of the pressure sensor corresponding to the bending arm 503. Therefore, when the detection value of the pressure sensor slightly decreases and fluctuates, if the decrease and fluctuation of the detection value of the pressure sensor are within the specified range, the device will control the output end of the electro-control telescopic part 506 corresponding to the pressure sensor to extend, so that the cylindrical head can stably press on the outside of the busbar, ensuring the stability of the busbar clamping. If the decrease and fluctuation of the detection value of the pressure sensor are outside the specified range, it indicates that the dents or defects on the busbar will affect the use effect of the busbar. At this time, the device will issue an alarm to remind the staff to replace the busbar.

[0058] After the busbar is installed and fixed, during the normal use of the device, if the device is impacted, the busbar is prone to vibrate in the wire threading part 6, which will affect the detection effect of the current transformer body 1. When the busbar vibrates, the detection values of all the pressure sensors of the device will fluctuate. Therefore, when the detection values of all the pressure sensors fluctuate, the device determines that the busbar jitters due to external factors. At this time, the device controls all the electro-control telescopic parts 506 to start, and the output ends of the electro-control telescopic parts 506 extend, so that the clamping force of the cylindrical head on the busbar increases, reducing the vibration of the busbar, ensuring that the position of the busbar in the wire threading part 6 does not change, and making the measurement effect of the current transformer body 1 better.

[0059] In summary, a 20kV wide-range current transformer of the present invention, by setting components such as pressure sensors, electro-control telescopic parts 506, bending arms 503, air jet holes and external air supply pumps, through the cooperation between the pressure sensors, the device can judge the position of the busbar and adjust it through the electro-control telescopic parts 506, and can also judge the impurities or dents outside the busbar. Then, it uses the air jet holes to jet air to clean the impurities outside the busbar, and according to the degree of the dents, correspondingly increases the clamping effect of the cylindrical head on the busbar or reminds the staff to replace the busbar in time. And when the device is impacted and vibrates, it can increase the clamping force on the busbar to ensure the stability of the device.

[0060] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0061] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 20 kV wide-range current transformer, characterized in that, Comprising: The current transformer body (1), at the central position inside the current transformer body (1), there is a wire passing part (6) for the busbar to pass through. On the front and rear outer walls of the current transformer body (1), back rings (2) are fixed, and on the outer wall of the back ring (2) away from the current transformer body (1), a front ring seat (3) is slidably installed. Between the opposite outer walls of the front ring seat (3) and the back ring (2), several elastic reset structures are provided; The lever - type self - reset wire - supporting assembly (5), the number and position of the lever - type self - reset wire - supporting assembly (5) correspond one - to - one with the elastic reset structures. The lever - type self - reset wire - supporting assembly (5) is installed on the outer wall of the front ring seat (3) away from the back ring (2). Several of the lever - type self - reset wire - supporting assemblies (5) are used to apply a radial force to the busbar in the wire passing part (6) when the front ring seat (3) approaches the back ring (2); The single - rail type bottom plate (7), the single - rail type bottom plate (7) is fixed at the bottom end of the current transformer body (1). The extending direction of the single - rail type bottom plate (7) is parallel to the extension line of the central axis of the wire passing part (6). On both sides of the top end of the single - rail type bottom plate (7), screw - rod pressing structures (8) for driving the front ring seat (3) to approach the back ring (2) are installed; The elastic reset structure is a push rod (4) fixed inside the back ring (2) and a reset spring (9) wound around one end of the surface of the push rod (4). Inside the front ring seat (3), there is a counterbore (303) for the push rod (4) to pass through and contact the lever - type self - reset wire - supporting assembly (5). One end of the reset spring (9) contacts the back surface of the front ring seat (3); The lever - type self - reset wire - supporting assembly (5) includes a T - shaped shaft frame (501) fixed on one side outer wall of the front ring seat (3), a hinge shaft (502) rotatably installed inside the T - shaped shaft frame (501), and a bent arm (503) fixed at one end of the surface of the hinge shaft (502). One end of the hinge shaft (502) penetrates to the outside of the T - shaped shaft frame (501) and is fixed with a stop disk (504). On the outer peripheral surface of the hinge shaft (502) between the stop disk (504) and the T - shaped shaft frame (501), a torsion spring (505) is installed. The two ends of the torsion spring (505) are respectively clamped with the outer wall of one side of the T - shaped shaft frame (501) and the outer wall of the stop disk (504). One end of the bent arm (503) contacts one end of the push rod (4); 2. The 20kV wide-range current transformer according to claim 1, wherein: On both sides of the bottom end of the current transformer body (1) of the single - rail type bottom plate (7), hole - carrying connecting feet (10) are fixed. On the outer walls of the two hole - carrying connecting feet (10) away from each other in the same X - axis direction, U - shaped notch grooves are provided; 3. A 20 kV wide-range current transformer according to claim 1, characterized in that: A guide pin (302) is fixed on the back surface of the front ring seat (3). The end of the guide pin (302) away from the front ring seat (3) extends into the inside of the back ring (2), and the guide pin (302) is in sliding fit with the back ring (2); 4. A 20 kV wide-range current transformer according to claim 3, characterized in that: A plurality of arc-shaped clamping plates (301) are integrally formed on the outer edge of the front ring seat (3). The inner diameter of the arc-shaped clamping plate (301) is equal to the outer diameter of the back ring (2), and the inner wall of the arc-shaped clamping plate (301) is in sliding fit with the outer wall of the back ring (2).

5. A 20 kV wide-range current transformer according to claim 1, characterized in that: Rectangular notch portions (5041) for the ends of the torsion springs (505) to be inserted are provided on the outer wall of one side of the T-shaped shaft bracket (501) and the outer wall of the retaining disc (504).

6. A 20 kV wide-range current transformer according to claim 1, characterized in that: The bent arm (503) is made of a member of hard plastic material. An electric control telescopic member (506) is provided on the side of the bent arm (503) away from the hinge shaft (502). The output end of the electric control telescopic member (506) is provided with a pressure rod (507). The end of the pressure rod (507) is provided with a cylindrical head. A pressure sensor is provided on the side of the bent arm (503) close to the ejector rod (4). An air injection hole is provided on the cylindrical head, and the air injection hole is connected to an external air supply pump.

7. A 20 kV wide-range current transformer according to claim 1, characterized in that: The screw rod pressing structure (8) includes a threaded shaft (801) installed on the outer wall of one side of the single-rail type bottom plate (7) through a nut pair, a table plate (802) slidably installed at the top of the single-rail type bottom plate (7), and a U-shaped connecting arm (803) extending upward and fixed to one side of the top of the table plate (802). One end of the threaded shaft (801) is rotatably connected to the outer wall of one side of the table plate (802), and the outer wall of one side of the U-shaped connecting arm (803) is fixedly connected to the outer wall of one side of the front ring seat (3).

8. A 20 kV wide-range current transformer according to claim 7, characterized in that: A sliding sleeve is fixed to the bottom end of the table plate (802), and the bottom end of the sliding sleeve is in sliding fit with the top end of the single-rail type bottom plate (7).

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