20kV wide-limit current transformer

Abstract

The invention discloses a 20kV wide-limit current transformer which comprises a current transformer body, a threading part for a bus to penetrate out is arranged in the center of the interior of the current transformer body, and back rings are fixed to the front outer wall and the rear outer wall of the current transformer body. A front ring seat is slidably mounted on the outer wall of the side, away from the current transformer body, of the back ring, and a plurality of elastic reset structures are arranged between the outer walls of the opposite sides of the front ring seat and the back ring. The front ring seat is gradually close to the back ring through the lead screw crimping structure, effective bearing and limiting of the bus can be achieved, no external component is introduced into the threading part of the wide-limit current transformer in the process, any possible interference source is eliminated, the clear measurement environment is beneficial to improving the response speed and sensitivity of the transformer, and the measurement accuracy is improved. Therefore, the mutual inductor can timely and accurately reflect the change condition of the current when the transient change of the power system occurs.

Description

Technical Field

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

[0002] The 20kV wide-limit current transformer is a key power equipment, mainly used for current measurement and protection in high-voltage power systems. Its main function is to convert high-voltage and high-current current signals into low-voltage and low-current signals to facilitate the subsequent monitoring, measurement and protection of equipment. The 20kV wide-limit current transformer is mainly composed of several parts such as iron core, winding, insulation material and shell. The iron core is usually made of high magnetic permeability material, which is used to concentrate and guide magnetic flux to ensure the accuracy of measurement. The windings of the transformer are divided into main windings and secondary windings. The main winding is connected to the high-voltage circuit, and the secondary winding outputs a low-current signal. By reasonably designing the turns ratio of the two windings, the current reduction ratio can be achieved, thereby converting high current into a measurable low-current signal. The insulating material is used to ensure the safety of the transformer in a high-voltage environment and prevent electrical breakdown and leakage. The shell provides mechanical protection to ensure the stable operation of the equipment in various environments; For example, a threading structure of a current transformer disclosed in the authorization announcement number CN222015206U includes a transformer body, a threading hole is provided in the middle of the surface of the transformer body, a busbar is inserted in the threading hole, a threading clamping mechanism for clamping and fixing the busbar is provided in the threading hole, the threading clamping mechanism includes a slide groove, a slider, a connecting block, and a clamping block, a plurality of slide grooves are evenly provided on the outer surface of the transformer body, a slider is movably provided inside the slide groove, and a connecting block is fixedly provided on the outer surface of the slider, which adds a threading clamping mechanism to the traditional through-type current transformer, so that the busbar can be clamped and fixed, effectively reducing the swing of the busbar caused by vibration and avoiding unnecessary friction loss. However, during use, the above technical solution mainly supports the cable by several clamping blocks inserted into the wire threading holes of the current transformer. However, the clamping blocks have entered the interior of the current transformer and are located on the outside of the cable. The working principle of the wide-limit current transformer is based on the law of electromagnetic induction. The current flow in the main winding will generate a magnetic field, which induces a low current signal proportional to the main current in the secondary winding. However, the presence of the clamping block will affect the distribution and intensity of the magnetic field. When the clamping block hinders the uniform distribution of the magnetic field, it is easy to cause the current signal induced by the secondary winding to no longer be proportional to the main current, thereby introducing measurement errors. If the material of the clamping block has a high magnetic permeability, it will also cause distortion of the magnetic field, resulting in inaccurate measurement results.

[0003] When there are impurities attached to the outer surface of the busbar, the cylindrical head presses on 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. In addition, the busbar itself has weight. When three cylindrical heads are used to support the busbar, the position of the busbar is likely to be biased downward, which can easily cause errors in the measurement results. At the same time, when there are depressions on the surface of the busbar, the position of the busbar in the threading part will also be affected. Summary of the invention

[0004] The object of the present invention is to provide a 20kV wide-range current transformer, in which the energized busbar to be measured passes through the wide-range current transformer, and a back ring with a plurality of push rods is fixed on the front and rear outer walls of the wide-range current transformer, and the front ring seat is forced to gradually approach the back ring by the screw crimping structure. Due to the existence of the push rod, the lever-type self-resetting wire supporting assembly will be pushed, and then the plurality of lever-type self-resetting wire supporting assemblies of 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 is no obstruction in the wire passing hole of the wide-range current transformer, and only the busbar exists, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a 20kV wide-range current transformer, comprising: A current transformer body, wherein a threading portion for a busbar to pass through is arranged at the center of the current transformer body, a back ring is fixed on both the front and rear outer walls of the current transformer body, and a front ring seat is slidably mounted on the outer wall of the back ring away from the current transformer body, and a plurality of elastic reset structures are arranged between the front ring seat and the outer wall on the opposite side of the back ring; A lever-type self-resetting wire-supporting assembly, the number and position of which correspond to the elastic reset structure one by one, and the lever-type self-resetting wire-supporting assembly is installed on the outer wall of the front ring seat away from the back ring, and a plurality of the lever-type self-resetting wire-supporting assemblies are used to apply radial force to the busbar in the threading part when the front ring seat approaches the back ring; A monorail type base plate is fixed at the bottom end of the current transformer body, the extension direction of the monorail type base plate is parallel to the extension line of the central axis of the threading part, and both sides of the top of the monorail type base plate are installed with a screw crimping structure for driving the front ring seat close to the back ring.

[0006] Preferably, the bottom ends of the current transformer bodies on both sides of the monorail bottom plate are fixed with connecting feet with holes, and the outer walls of the two connecting feet with holes on the same X-axis direction that are away from each other are both provided with U-shaped notches.

[0007] Preferably, the elastic reset structure is a push rod fixed inside the back ring and a reset spring wrapped around one end of the push rod surface, and the interior of the front ring seat is provided with a countersunk hole for the push rod to pass through and contact the lever-type self-reset wire support assembly, and one end of the reset spring is in contact with the back side of the front ring seat.

[0008] Preferably, a guide pin is fixed to the back side of the front ring seat, and one end of the guide pin away from the front ring seat extends to the inside of the back ring, and the guide pin and the back ring are slidably matched.

[0009] 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 plates is equal to the outer diameter of the back ring, and the inner wall of the arc-shaped holding plates and the outer wall of the back ring are slidably matched.

[0010] Preferably, the lever-type self-resetting wire support assembly includes a T-shaped axle frame fixed on the outer wall of one side of the front ring seat, a hinge shaft rotatably installed inside the T-shaped axle frame, and a bending arm fixed at one end of the hinge shaft surface, one end of the hinge shaft passes through the outside of the T-shaped axle frame and is fixed with a baffle plate, a torsion spring is installed on the outer circumferential surface of the hinge shaft between the baffle plate and the T-shaped axle frame, two ends of the torsion spring are respectively embedded with the outer wall of one side of the T-shaped axle frame and the outer wall of the baffle plate, and one end of the bending arm is in contact with one end of the push rod.

[0011] Preferably, a rectangular notch for the end of the torsion spring to be embedded is provided on an outer wall of one side of the T-shaped shaft frame and an outer wall of the baffle.

[0012] Preferably, the bending arm is made of a component of hard plastic material, an electrically controlled telescopic component is provided on the side of the bending arm away from the hinge axis, a pressure rod is provided at the output end of the electrically controlled telescopic component, a cylindrical head is provided at the end of the pressure rod, a pressure sensor is provided on the side of the bending arm close to the top rod, an air jet hole is provided on the cylindrical head, and the air jet hole is connected to an external air supply pump.

[0013] Preferably, the screw crimping structure includes a threaded shaft installed on the outer wall of one side of the monorail base plate through a nut pair, a table plate slidably installed on the top of the monorail base plate, and a U-shaped connecting arm fixed on one side of the top of the table plate and extending upward, one end of the threaded shaft is rotatably connected to the outer wall of one side of the table plate, and one side outer wall of the U-shaped connecting arm is fixedly connected to the outer wall of one side of the front ring seat.

[0014] Preferably, a sliding sleeve is fixed to the bottom end of the platform, and the bottom end of the sliding sleeve is slidably matched with the top end of the monorail bottom plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The front ring seat is gradually moved closer to the back ring by using the screw crimping structure, which can realize the effective support and limitation of the busbar. In this process, no external components are introduced into the threading part of the wide-limit current transformer, eliminating any possible interference sources. This clear measurement environment helps to improve the response speed and sensitivity of the transformer.

[0016] 2. When the busbar is accurately positioned in the threading part of the wide-limit current transformer, the radial force applied by the lever-type self-resetting wire-supporting assembly of the front ring seat can ensure that the busbar always remains in the ideal center position, thereby reducing the measurement error caused by eccentricity. This precise positioning can effectively improve the reliability of current measurement.

[0017] 3. By using the design of a push rod and a lever-type self-resetting wire support assembly, the busbar can be firmly supported and limited, reducing the 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 failure caused by mechanical loss, ensuring long-term and stable operation of the equipment.

[0018] 4. By setting up components such as pressure sensors, electric-controlled telescopic parts, bending arms, air jet holes and external air supply pumps, the equipment can judge the position of the busbar and adjust it through the electric-controlled telescopic parts through the cooperation between various pressure sensors, and can make the equipment judge the impurities or depressions on the outside of the busbar, and then use the air jet holes to clean the impurities on the outside of the busbar, and increase the clamping effect of the cylindrical head on the busbar according to the degree of depression, or remind the staff to replace the busbar in time, and when the equipment is impacted and vibrated, it can increase the clamping force on the busbar to ensure the stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a side view structural schematic diagram of the present invention; Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 4 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 5 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ; Figure 6 This is a schematic diagram of the three-dimensional structure of the front ring seat of the second embodiment of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the lever-type self-resetting wire-supporting assembly according to the second embodiment of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the monorail base plate of the third embodiment of the present invention.

[0020] In the figure: 1. current transformer body; 2. back ring; 3. front ring seat; 301. arc-shaped holding plate; 302. guide pin; 303. countersunk hole; 4. push rod; 5. lever-type self-resetting wire support assembly; 501. T-shaped shaft frame; 502. hinge shaft; 503. bending arm; 504. baffle; 5041. rectangular notch; 505. torsion spring; 506. electric control telescopic part; 507. pressure rod; 6. threading part; 7. monorail bottom plate; 8. screw rod crimping structure; 801. threaded shaft; 802. table plate; 803. U-shaped connecting arm; 9. reset spring; 10. connecting foot with hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1 Depend on Figures 1 to 5 A 20kV wide-range current transformer of the present invention comprises a current transformer body 1, a threading portion 6 for a busbar to pass through is arranged at the center position inside the current transformer body 1, the busbar is passed through the threading portion 6 of the current transformer body 1 to ensure that the busbar can pass smoothly without any hindrance, a back ring 2 is 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 on the side away from the current transformer body 1, and a plurality of elastic reset structures are arranged between the front ring seat 3 and the outer walls on the opposite sides of the back ring 2.

[0023] The lever-type self-resetting wire-supporting assembly 5, the number and position of the lever-type self-resetting wire-supporting assembly 5 correspond one-to-one to the elastic reset structure, the lever-type self-resetting wire-supporting assembly 5 is installed on the outer wall of the side of the front ring seat 3 away from the back ring 2, and several lever-type self-resetting wire-supporting assemblies 5 are used to apply radial force to the busbar in the threading part 6 when the front ring seat 3 approaches the back ring 2.

[0024] The monorail type base plate 7 is fixed to the bottom end of the current transformer body 1, and the bottom ends of the current transformer bodies 1 on both sides of the monorail type base plate 7 are fixed with perforated connecting pins 10, and the outer wall on the side away from the two perforated connecting pins 10 in the same X-axis direction is provided with a U-mouth notch.

[0025] The extension direction of the monorail base plate 7 is parallel to the extension line of the central axis of the threading part 6. Both sides of the top of the monorail base plate 7 are installed with a screw crimping structure 8 for driving the front ring seat 3 to approach the back ring 2. The screw crimping structure 8 is used 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.

[0026] After the elastic reset structure contacts the lever-type self-reset 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 remains stable when subjected to external disturbances.

[0027] 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. A countersunk hole 303 is provided inside the front ring seat 3 for the push rod 4 to pass through and contact with the lever-type self-reset wire support assembly 5. One end of the reset spring 9 contacts the back side of the front ring seat 3. When the screw crimping structure 8 is operated to drive the front ring seat 3 toward the back ring 2, the push rod 4 will gradually be pushed out of the countersunk hole 303 of the front ring seat 3 and contact with the lever-type self-reset wire support assembly 5, thereby forcing the lever-type self-reset wire support assembly 5 to clamp the wire. During this process, the reset spring 9 will be gradually compressed and deformed due to the movement of the front ring seat 3.

[0028] When the movable end of the screw crimping structure 8 is in a fixed connection state with the front ring seat 3, the screw crimping structure 8 can drive the front ring seat 3 away from the back ring 2, and utilize 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 support assembly 5 on the busbar, and is suitable for use with busbars of different diameter specifications.

[0029] A guide pin 302 is fixed on the back side of the front ring seat 3, and the end of the guide pin 302 away from the front ring seat 3 extends to the inside of the back ring 2. The guide pin 302 and the back ring 2 are slidably matched. When the front ring seat 3 approaches or moves 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.

[0030] The outer edge of the front ring seat 3 is integrally formed with a plurality of arc-shaped holding plates 301, 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 slidably matched, and the arc-shaped holding plates 301 provide additional support, so that the front ring seat 3 is more stable when bearing the busbar load. This enhancement of the load-bearing capacity helps to maintain the line-supporting stability of the structure under high current or vibration conditions.

[0031] Depend on Figure 6 and Figure 7It is given that the lever-type self-resetting wire support assembly 5 includes a T-shaped shaft frame 501 fixed on the outer wall of one side of the front ring seat 3, a hinge shaft 502 rotatably installed inside the T-shaped shaft frame 501, and a bending arm 503 fixed at one end of the surface of the hinge shaft 502, one end of the hinge shaft 502 passes through the outside of the T-shaped shaft frame 501 and is fixed with a baffle 504, and a torsion spring 505 is installed on the outer peripheral surface of the hinge shaft 502 between the baffle 504 and the T-shaped shaft frame 501, and the two ends of the torsion spring 505 are respectively embedded with the outer wall of one side of the T-shaped shaft frame 501 and the outer wall of the baffle 504, and one end of the bending arm 503 is in contact with one end of the push rod 4.

[0032] When the busbar is introduced into the threading part 6 of the current transformer body 1, the bending arm 503 is connected to the T-shaped shaft frame 501 through the hinge shaft 502. As the front ring seat 3 slides, the end of the top rod 4 will force the bending arm 503 to deflect. Due to the design of the bending arm 503, the force applied to the busbar is radial. This force ensures that the busbar fits tightly in the threading part 6 of the current transformer.

[0033] A rectangular notch 5041 is provided on one side outer wall of the T-shaped shaft frame 501 and the outer wall of the baffle plate 504 for the end of the torsion spring 505 to be embedded in. When the torsion spring 505 suppresses the deflection of the bending arm 503, the two ends of the torsion spring 505 are respectively hooked on the outer wall of the T-shaped shaft frame 501 and the outer wall of the baffle plate 504, and the rectangular notch 5041 is provided for the end of the torsion spring 505 to be embedded in, so that the torsion spring 505 can be deformed in time and generate elastic force.

[0034] A cylindrical head is provided at the bottom end of the bending arm 503, and the bending arm 503 is made of a hard plastic material. In the case of current changes or external disturbances, the busbar may be affected by external forces, causing its position to change. Due to the leverage of the bending arm 503 and the presence of the torsion spring 505, the bending arm 503 can quickly adjust its position to continue to apply clamping force to the busbar. This dynamic response capability ensures the stability of the current transformer under various working conditions.

[0035] Depend on Figure 8 It is given that the screw crimping structure 8 includes a threaded shaft 801 installed on the outer wall of one side of the monorail base plate 7 through a nut pair, a table plate 802 slidably installed on the top of the monorail base 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 side outer wall of the U-shaped connecting arm 803 is fixedly connected to the outer wall of one side of the front ring seat 3, and a sliding sleeve is fixed to the bottom end of the table plate 802, and the bottom end of the sliding sleeve is slidably matched with the top of the monorail base plate 7.

[0036] 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.

[0037] 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.

[0038] Embodiment 2 A 20kV wide-range current transformer proposed in the above embodiment, when impurities are attached to the outer surface of the busbar, the cylindrical head is pressed on 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, and the busbar itself has weight. When three cylindrical heads are used to support the busbar, the position of the busbar is likely to be biased downward, 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 on the threading part 6, thereby affecting the measurement results. For this reason, the following scheme is made: like Figures 1 to 8 As shown, an electrically controlled telescopic member 506 is provided on the side of the bending arm 503 away from the hinge axis 502, a pressure rod 507 is provided on the output end of the electrically controlled telescopic member 506, a cylindrical head is provided at the end of the pressure rod 507, a pressure sensor is provided on the side of the bending arm 503 close to the top rod 4, an air jet hole is provided on the cylindrical head, and the air jet 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 to adjust the position of the busbar in the threading part 6 more accurately, and the pressure between the cylindrical head and the busbar can be indirectly detected with the assistance of the pressure sensor, and then the position of the busbar can be indirectly determined by comparing the detection values ​​of the pressure sensors in three directions. After starting the external air supply pump, the air jet hole will spray gas, and under the action of the sprayed gas, impurities on the outside of the busbar can be cleaned, thereby ensuring the stability of the busbar clamping.

[0039] During the use of the present invention, when the busbar passes through the threading part 6 and is clamped by the present invention, as the threaded shaft 801 rotates, the U-shaped connecting arm 803 moves toward the current transformer body 1, and the bent arm 503 contacts the top rod 4, thereby causing the detection value of the pressure sensor to begin to increase.

[0040] At this time, through the coordinated detection of the pressure sensors on the three bending arms 503, if the detection value growth rate of the two pressure sensors at the bottom is greater than that of the upper pressure sensor, it indicates that the weight of the busbar passing through the threading part 6 is relatively large, and thus the pressure generated by the busbar on the two bending arms 503 at the bottom is large. At this time, the position of the busbar in the threading part 6 will be biased downward, so the equipment control starts the electrically controlled telescopic parts 506 corresponding to the two pressure sensors at the bottom, so that the output ends of the two electrically controlled telescopic parts 506 at the bottom are extended, and then the two pressure rods 507 at the bottom work together to lift the busbar upward, so that the busbar is located at the center of the threading part 6, so that the measurement of the current transformer body 1 of the equipment is more accurate.

[0041] During the movement of the U-shaped connecting arm 803, the cylindrical head will slide on the busbar. If there are impurities on the busbar, the cylindrical head will deflect the bending arm 503 when passing through the impurities, thereby increasing and jumping the detection value of the pressure sensor corresponding to the bending arm 503. Therefore, when the detection value of the pressure sensor increases and jumps slightly, 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 jet hole on the cylindrical head spray gas. The gas sprayed from the jet hole will clean the impurities on the surface of the busbar to ensure that the busbar will not be damaged by clamping, making the use of the equipment more stable.

[0042] During the movement of the U-shaped connecting arm 803, the cylindrical head will slide on the busbar. If there is a concave defect on the busbar, the cylindrical head will deflect the bending arm 503 when passing through the concave defect, thereby reducing and jumping the detection value of the pressure sensor corresponding to the bending arm 503. Therefore, when the detection value of the pressure sensor decreases and jumps slightly, if the decrease and jump of the detection value of the pressure sensor is within a limited range, the equipment will control the output end of the electrically controlled telescopic component 506 corresponding to the pressure sensor to extend, so that the cylindrical head can be stably pressed on the outside of the busbar to ensure the stability of the busbar clamping. If the decrease and jump of the detection value of the pressure sensor is outside the limited range, it indicates that the concave defect of the busbar will affect the use of the busbar. At this time, the equipment will sound an alarm to remind the staff to replace the busbar.

[0043] After the busbar is installed and fixed, during the normal use of the equipment, if the equipment is hit, the busbar is prone to vibrate in the threading part 6, which will affect the detection effect of the current transformer body 1. When the busbar vibrates, the detection values ​​of each pressure sensor of the equipment will jump. Therefore, when the detection values ​​of each pressure sensor jump, the equipment determines that the busbar jitter is caused by external factors. At this time, the equipment controls all the electrically controlled telescopic parts 506 to start, extend the output end of the electrically controlled telescopic parts 506, and increase the clamping force of the cylindrical head on the busbar to reduce the vibration of the busbar, ensure that the position of the busbar in the threading part 6 does not change, and make the measurement effect of the current transformer body 1 better.

[0044] In summary, a 20kV wide-range current transformer of the present invention is equipped with components such as pressure sensors, electrically controlled telescopic parts 506, bending arms 503, 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 electrically controlled telescopic parts 506. It can also judge the impurities or depressions on the outside of the busbar, and then use the jet holes to clean the impurities on the outside of the busbar. According to the degree of the depression, the clamping effect of the cylindrical head on the busbar is increased or the staff is reminded to replace the busbar in time. When the equipment is impacted and vibrated, the clamping force on the busbar can be increased to ensure the stability of the equipment.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 20kV wide-range current transformer, characterized in that: include: A current transformer body (1), wherein a threading portion (6) for a busbar to pass through is arranged at a central position inside the current transformer body (1), a back ring (2) is fixed on both the front and rear outer walls of the current transformer body (1), and a front ring seat (3) is slidably mounted on the outer wall of the back ring (2) on a side away from the current transformer body (1), and a plurality of elastic reset structures are arranged between the front ring seat (3) and the outer walls on opposite sides of the back ring (2); A lever-type self-resetting wire-supporting assembly (5), wherein the number and position of the lever-type self-resetting wire-supporting assembly (5) correspond one-to-one to the elastic reset structure, and the lever-type self-resetting wire-supporting assembly (5) is installed on the outer wall of the front ring seat (3) away from the back ring (2), and a plurality of the lever-type self-resetting wire-supporting assemblies (5) are used to apply a radial force to the busbar in the threading portion (6) when the front ring seat (3) approaches the back ring (2); A monorail bottom plate (7) is fixed to the bottom end of the current transformer body (1), the extension direction of the monorail bottom plate (7) is parallel to the extension line of the central axis of the threading portion (6), and screw rod crimping structures (8) for driving the front ring seat (3) to approach the back ring (2) are installed on both sides of the top end of the monorail bottom plate (7).

2. A 20kV wide-range current transformer according to claim 1, characterized in that: The bottom ends of the current transformer bodies (1) on both sides of the monorail bottom plate (7) are both fixed with connection feet (10) with holes, and the outer walls of the two connection feet (10) with holes that are away from each other in the same X-axis direction are both provided with U-shaped notches.

3. A 20kV wide-range current transformer according to claim 1, characterized in that: The elastic reset structure comprises a push rod (4) fixed inside the back ring (2) and a reset spring (9) wound around one end of the push rod (4). A countersunk hole (303) is provided inside the front ring seat (3) for the push rod (4) to pass through and contact the lever-type self-reset wire support assembly (5). One end of the reset spring (9) contacts the back side of the front ring seat (3).

4. A 20kV wide-range current transformer according to claim 3, characterized in that: A guide pin (302) is fixed on the back side of the front ring seat (3), and one end of the guide pin (302) away from the front ring seat (3) extends to the inside of the back ring (2), and the guide pin (302) and the back ring (2) are slidably matched.

5. A 20kV wide-range current transformer according to claim 4, characterized in that: The outer edge of the front ring seat (3) is integrally formed with a plurality of arc-shaped holding plates (301); 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 slidably matched.

6. A 20kV wide-range current transformer according to claim 3, characterized in that: The lever-type self-resetting wire-supporting assembly (5) comprises a T-shaped shaft frame (501) fixed on an outer wall of one side of the front ring seat (3), a hinge shaft (502) rotatably mounted inside the T-shaped shaft frame (501), and a bending arm (503) fixed on one end of the surface of the hinge shaft (502); one end of the hinge shaft (502) penetrates the outside of the T-shaped shaft frame (501) and is fixed with a baffle (504); a torsion spring (505) is installed on the outer circumference of the hinge shaft (502) between the baffle (504) and the T-shaped shaft frame (501); two ends of the torsion spring (505) are respectively engaged with an outer wall of one side of the T-shaped shaft frame (501) and an outer wall of the baffle (504); one end of the bending arm (503) is in contact with one end of the push rod (4).

7. A 20kV wide-range current transformer according to claim 6, characterized in that: A rectangular notch (5041) for the end of the torsion spring (505) to be embedded is provided on the outer wall of one side of the T-shaped shaft frame (501) and the outer wall of the baffle plate (504).

8. A 20kV wide-range current transformer according to claim 6, characterized in that: The bending arm (503) is made of a hard plastic material. An electrically controlled telescopic component (506) is arranged on a side of the bending arm (503) away from the hinge shaft (502). A pressure rod (507) is arranged at the output end of the electrically controlled telescopic component (506). A cylindrical head is arranged at the end of the pressure rod (507). A pressure sensor is arranged on a side of the bending arm (503) close to the top rod (4). An air jet hole is arranged on the cylindrical head. The air jet hole is connected to an external air supply pump.

9. A 20kV wide-range current transformer according to claim 6, characterized in that: The screw rod crimping structure (8) comprises a threaded shaft (801) mounted on an outer wall of one side of a monorail bottom plate (7) via a nut pair, a table plate (802) slidably mounted on the top of the monorail bottom plate (7), and a U-shaped connecting arm (803) fixed to one side of the top of the table plate (802) and extending upward, one end of the threaded shaft (801) being rotatably connected to an outer wall of one side of the table plate (802), and one outer wall of one side of the U-shaped connecting arm (803) being fixedly connected to an outer wall of one side of the front ring seat (3).

10. A 20kV wide-range current transformer according to claim 9, characterized in that: A sliding sleeve is fixed to the bottom end of the platform (802), and the bottom end of the sliding sleeve is slidably matched with the top end of the monorail bottom plate (7).

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