Automatic calibrating device for high-voltage current transformer

Abstract

The invention provides an automatic calibrating device for a high-voltage current transformer, and belongs to the technical field of current transformer calibration. Comprising a shell, a feeding hole is formed in the side face of the shell, and a conveyor is installed at the feeding hole and used for conveying the high-voltage current transformer. Through the arrangement of the shell, the conveyor and the first electric push rod, during verification, the high-voltage current transformer is placed on the conveyor, the high-voltage current transformer is conveyed to the position below the top wiring terminal through the conveyor, meanwhile, the side wiring terminal is electrically connected with the wiring end of the high-voltage current transformer, then the first electric push rod is started, and the high-voltage current transformer is conveyed to the position below the top wiring terminal through the conveyor. The first electric push rod drives the top wiring terminal to be electrically connected with the connecting section of the high-voltage current transformer, then detection can be conducted, after detection is completed, the first electric push rod drives the top wiring terminal to move upwards, the conveyor conveys the high-voltage current transformer out of the shell, and the high-voltage current transformer is manually taken down. The clamp does not need to be fixed and taken down, and operation is more convenient.

Description

Technical Field

[0001] This invention relates to the field of current transformer calibration technology, and in particular to an automated calibration device for high-voltage current transformers. Background Technology

[0002] High-voltage current transformers are devices in power systems that proportionally convert high-voltage, high-current signals into low-voltage, low-current signals for measurement, protection, and metering. They consist of a primary winding, a secondary winding, an iron core, and an insulating shell. During production, they require calibration to verify that their performance indicators, such as transformation ratio error and phase difference, meet national standards. This ensures accurate metering and reliable operation of protection devices, preventing metering deviations or malfunctions caused by insufficient accuracy. The calibration device is a specialized instrument for verifying their performance, consisting of a calibrator and a control unit. During use, the device under test is connected to the calibrator according to polarity, and then the test is performed.

[0003] Since high-voltage current transformers have multiple terminals, during calibration, it is necessary to use clamps to connect the lines to the terminals of the high-voltage current transformer. After the test is completed, the clamps are removed from the high-voltage current transformer. This single test operation is cumbersome. Therefore, this application provides an automated calibration device for high-voltage current transformers to meet the requirements. Summary of the Invention

[0004] This invention provides an automated calibration device for high-voltage current transformers to solve the problem of cumbersome single-test operation.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An automated calibration device for high-voltage current transformers includes a housing with an inlet hole on the side of the housing. A conveyor is installed at the inlet hole to transport the high-voltage current transformer. An electric push rod is fixed to the top of the inner wall of the housing. An output plate is fixed to the output end of the electric push rod. Two top terminals are symmetrically arranged at the bottom of the mounting plate. Two side terminals are installed on the end of the conveyor away from the inlet hole via a support. A calibrator is fixed inside the housing via a support plate. The calibrator is electrically connected to the two side terminals and the two top terminals respectively. A heat dissipation mechanism is provided for dissipating heat from the two top terminals.

[0006] Preferably, the heat dissipation mechanism includes a support plate fixed to the inner wall of the housing, a connecting frame fixed to the side of the support plate, an electric push rod II fixed to the bottom of the connecting frame, a base plate fixed to the output end of the electric push rod II, a fan shroud fixed to the side of the base plate away from the mounting plate, the fan shroud being hollow inside, multiple air inlets opened on the side of the fan shroud away from the mounting plate, a fan fixed to the air inlet of the fan shroud, and an air outlet opened on the side of the fan shroud away from the fan.

[0007] Preferably, a rotating shaft is fixed to the side of the top terminal block, and a rotating seat is fixed to the bottom of the mounting plate. The rotating shaft is rotatably connected to the side of the rotating seat. A torsion spring is movably sleeved on the rotating shaft. The two ends of the torsion spring are respectively engaged with the side of the top terminal block and the side of the rotating seat. Two sets of pressing components are provided on the side of the support plate away from the electric push rod. The pressing components are used to press down the top terminal block.

[0008] Preferably, the pressing assembly includes a bracket fixed to the side of the support plate, an electric push rod three is fixed to the top of the bracket, the output end of the electric push rod three movably passes through the bracket and is fixed to a pressure plate, the pressure plate has a protrusion integrally formed on the side facing the electric push rod one, a through groove is opened on the top of the mounting plate and at the top terminal, and the pressure plate is located at the through groove.

[0009] Preferably, the base plate is provided with a cleaning component, which is used to clean the contact surface between the top terminal and the high-voltage current transformer.

[0010] Preferably, the cleaning assembly includes a rubber belt and two cylinders rotatably connected to the base plate. The middle part of the rubber belt is V-shaped with the tip pointing towards the wind hood. The end of the rubber belt wraps around the cylinder and is fixed to the surface of the cylinder. A cleaning strip, which is a felt strip, is fixed to the surface of the part of the rubber belt that wraps around the cylinder. When cleaning the top terminal, the cleaning strip adheres to the surface of the top terminal. A driving assembly is provided on the inner side of the V-shape of the rubber belt. The driving assembly is used to drive the rubber belt to move. A second rotating shaft is fixed to the bottom of the cylinder. The second rotating shaft movably passes through the mounting plate and is fixed to a limit plate. A second torsion spring is movably sleeved on the surface of the second rotating shaft. The two ends of the second torsion spring are respectively engaged with the surfaces of the mounting plate and the limit plate.

[0011] Preferably, the drive assembly includes an electric push rod four, a vertical plate is fixed to the side of the base plate, the electric push rod four is fixed to the side of the vertical plate, and the output end of the electric push rod four movably passes through the vertical plate and is fixed at the bend in the middle of the rubber belt.

[0012] Preferably, an inner cavity is formed inside the rubber belt and located at the cleaning belt, and the inner cavity is filled with high-pressure gas.

[0013] Preferably, multiple support blocks are symmetrically fixed to the surface of the V-shaped part of the rubber strip, and a cloth strip is fixed to the side of the support block. The side of the cloth strip away from the support block is fixed to the surface of the rubber strip. The air outlet has a small aperture at the rubber strip and a large aperture at the top terminal.

[0014] Preferably, the top terminal has multiple through holes on its side.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up a housing, a conveyor, and an electric push rod, during the inspection, the high-voltage current transformer is placed on the conveyor and transported to below the top terminal block. At the same time, the side terminal block is electrically connected to the terminal block of the high-voltage current transformer. Then, the electric push rod is activated, which drives the top terminal block to electrically connect to the connection section of the high-voltage current transformer, allowing for testing. After the test is completed, the electric push rod moves the top terminal block upward, and the conveyor transports the high-voltage current transformer out of the housing. The high-voltage current transformer can then be manually removed, eliminating the need for fixing and removing clamps, making the operation more convenient.

[0016] By setting up a heat dissipation mechanism, during continuous testing, when a large current continuously passes through the top terminal, the top terminal will heat up. When the electric push rod moves the top terminal to reset upward, the air blown out from the air outlet can accelerate the air flow on the surface of the top terminal, reduce the heat of the top terminal, thereby preventing the top terminal from overheating and melting, avoiding fire, improving the safety of the entire equipment, and also reducing the heat aging of the insulating mounting plate, improving the durability of the mounting plate.

[0017] By setting up a downward pressure assembly, after the top terminal is reset upwards and before the next high-voltage current transformer is detected, the electric push rod three can drive the pressure plate to move downwards. After the bottom of the pressure plate passes through the through slot, it abuts against the top of the top terminal. Then the top terminal rotates downwards until the protrusion fits against the side of the top terminal. At this time, the top terminal is vertically set. In this way, the top of the top terminal can be separated from the mounting plate, thereby increasing the contact area between the top terminal and the air, improving the heat dissipation capacity of the top terminal, and reducing the heat transfer to the mounting plate, thus further improving the durability of the mounting plate.

[0018] By setting up the cleaning component, after the pressing component presses the top terminal into a vertical position, the electric push rod two moves the base plate towards the top terminal. At this time, the cleaning strip can contact the surface of the top terminal and clean off the dust and other impurities attached to the surface of the top terminal, thereby preventing the surface resistance value of the top terminal from increasing due to dust and other impurities, reducing the generation of electric heat in the top terminal, and thus improving the safety of the entire equipment during use. Secondly, as the electric push rod two moves the base plate, the fan cover simultaneously approaches the top terminal, bringing the top terminal closer to the air outlet, thereby further improving the heat dissipation capacity of the top terminal. In addition, the V-shaped rubber strip in the middle can guide the airflow towards the top terminal, further improving the heat dissipation capacity of the top terminal.

[0019] By setting up a drive assembly, when the electric push rod two stops moving, the electric push rod four will drive the middle of the rubber belt to move towards the fan cover. At this time, the end of the rubber belt will drive the cylinder to rotate. At the same time, the rubber belt will drive the cleaning belt to detach from the surface of the top terminal, so that the channel between the cylinder and the top terminal is opened. In this way, the airflow can flow out smoothly from the channel, thereby further improving the heat dissipation capacity of the top terminal.

[0020] By setting up an inner cavity, the high-pressure gas inside the cavity causes the rubber belt to expand outward, thereby making the cleaning belt fit more tightly against the surface of the top terminal and improving the cleaning ability of the top terminal.

[0021] By setting up a cloth strip, the electric push rod four moves the rubber belt towards the air hood. The airflow blown out from the air outlet can cause the cloth strip to swing. After the cloth strip swings, it will cause the rubber belt to vibrate. After the rubber belt vibrates, it can shake off the dust on the cleaning belt, ensuring the cleaning ability of the cleaning belt. There is no need to manually clean the cleaning belt, making the operation convenient. At the same time, the air outlet diameter at the rubber belt is smaller, while the air outlet diameter at the top terminal is larger, allowing more airflow to pass through the top terminal, ensuring the heat dissipation capacity of the top terminal.

[0022] By setting through holes, the airflow blown out from the air outlet can pass through the through holes, thereby further increasing the contact area between the airflow and the top terminal and increasing the heat dissipation capacity of the top terminal. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 This is a schematic diagram of the heat dissipation mechanism of the present invention; Figure 4 This is a schematic diagram of the fan section of the present invention; Figure 5 This is a schematic diagram of the mounting plate structure of the present invention; Figure 6 This is a schematic diagram of the structure at the base plate of the present invention; Figure 7 This is a schematic diagram of the internal cavity structure of the present invention; Figure 8 This is a schematic diagram of the top terminal of the present invention.

[0024] In the diagram: 1. Housing; 2. Conveyor; 3. Side terminal; 4. Calibrator; 5. Electric push rod one; 6. Mounting plate; 7. Top terminal; 8. Heat dissipation mechanism; 9. Support plate; 10. Connecting frame; 11. Electric push rod two; 12. Base plate; 13. Fan cover; 14. Fan; 15. Air outlet; 16. Bracket; 17. Through groove; 18. Electric push rod three; 19. Pressure plate; 20. Protrusion; 21. Cylindrical; 22. Rubber belt; 23. Cleaning belt; 24. Inner cavity; 25. Support block; 26. Cloth strip; 27. Electric push rod four; 28. Through hole.

[0025] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0026] The automated calibration device for high-voltage current transformers provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0027] like Figures 1-8As shown, an embodiment of the present invention provides an automated calibration device for high-voltage current transformers, including a housing 1. A feed inlet is provided on the side of the housing 1, and a conveyor 2 is installed at the feed inlet for transporting high-voltage current transformers. An electric push rod 5 is fixed to the top of the inner wall of the housing 1, and a mounting plate 6 is fixed to the output end of the electric push rod 5. Two top terminals 7 are symmetrically arranged at the bottom of the mounting plate 6. Two side terminals 3 are mounted on the end of the conveyor 2 away from the feed inlet via a support. A calibrator 4 is fixed inside the housing 1 via a support plate, and the calibrator 4 is electrically connected to the two side terminals 3 and the two top terminals 7 respectively. The housing 1 serves to support all components of the device, forming a sealed calibration space to prevent external dust and impurities. The entry of foreign objects affects the calibration accuracy and protects internal components from external interference. The feed hole is used for the high-voltage current transformer to enter and exit the housing 1. The conveyor 2 is installed at the feed hole to automatically transport the high-voltage current transformer, realizing automated feeding and discharging, eliminating the need for manual handling and positioning, and improving calibration efficiency. The electric push rod 5 is fixed to the top of the inner wall of the housing 1 to provide linear power, driving the mounting plate 6 and the top terminal 7 to move up and down, realizing the docking and separation of the top terminal 7 with the high-voltage current transformer. The mounting plate 6 is used to fix the top terminal 7, ensuring that the two top terminals 7 are symmetrically positioned and ensuring accurate docking. The top terminal 7 is used to dock with the top connection terminal of the high-voltage current transformer to realize circuit conduction for calibration. Instrument 4 transmits detection signals; side terminal 3 is mounted on the end of conveyor 2 via a support, used to connect with the side terminal of the high-voltage current transformer, forming a complete detection circuit with top terminal 7; calibrator 4 is fixed inside housing 1, electrically connected to side terminal 3 and top terminal 7, used to automatically verify the electrical performance of the high-voltage current transformer, collect and analyze detection data in real time, and determine whether the transformer is qualified. In use, the high-voltage current transformer to be calibrated is placed on conveyor 2, which transports it from the inlet to below top terminal 7. Simultaneously, the side terminal of the high-voltage current transformer connects with side terminal 3, and the electric push rod 5 is activated, pushing the mounting plate 6 downwards, causing the top terminal 7 to connect. Terminal 7 is connected to the top connection end of the high-voltage current transformer, and the calibrator 4 starts to perform automated verification. After the verification is completed, the electric push rod 5 drives the top terminal 7 to reset upward, and the conveyor 2 transports the verified transformer out of the housing 1. The whole process does not require manual fixing and disassembly of the fixture, which is convenient to operate and highly automated. The conveyor 2 consists of a guide rail, a motor, a screw and a placement seat. The motor is fixed at the end of the guide rail, the screw is fixed at the output end of the motor, and the placement seat is threaded onto the surface of the screw. The placement seat and the guide rail are slidably connected. When in use, the motor drives the screw to rotate, and the rotation of the screw can drive the placement seat to move on the guide rail. The placement seat is equipped with a positioning column for positioning the high-voltage current transformer. The heat dissipation mechanism 8 is used to dissipate heat from the two top terminals 7. The heat dissipation mechanism 8 includes a support plate 9 fixed to the inner wall of the housing 1. A connecting frame 10 is fixed to the side of the support plate 9, and an electric push rod 11 is fixed to the bottom of the connecting frame 10. A base plate 12 is fixed to the output end of the electric push rod 11. A fan shroud 13 is fixed to the side of the base plate 12 away from the mounting plate 6. The fan shroud 13 is hollow inside and has multiple air inlets on the side away from the mounting plate 6. A fan 14 is fixed to the air inlets of the fan shroud 13, and an air outlet 15 is opened on the side of the fan shroud 13 away from the fan. The support plate 9 is fixed to the inner wall of the housing 1 to fix the connecting frame 10, providing installation support for the entire heat dissipation mechanism 8 and ensuring stable operation of the heat dissipation mechanism 8. The connecting frame 10 is fixed to the side of the support plate 9 to connect the electric push rod 11. Rod 2 11 is used to adjust the installation position of the electric push rod 2 11, enabling it to precisely move the base plate 12. The electric push rod 2 11 is fixed to the bottom of the connecting frame 10 and provides linear power to move the base plate 12, the hood 13, and the fan 14 closer to or further away from the top terminal 7, adjusting the heat dissipation distance and improving the heat dissipation effect. The base plate 12 is used to fix the hood 13 and also provides a mounting carrier for subsequent cleaning components. The hood 13 is hollow inside to guide airflow. The air inlet is used to draw in outside air, and the air outlet 15 is used to guide the airflow to the top terminal 7 for directional heat dissipation. The fan 14 is fixed at the air inlet of the hood 13 to generate airflow, drawing in outside cold air into the hood 13 and blowing it towards the top terminal 7 through the air outlet 15, accelerating the airflow on the surface of the top terminal 7 and reducing its temperature.

[0028] like Figure 3As shown in this embodiment, a rotating shaft is fixed to the side of the top terminal 7, and a rotating seat is fixed to the bottom of the mounting plate 6. The rotating shaft is rotatably connected to the side of the rotating seat. A torsion spring is movably sleeved on the rotating shaft. The two ends of the torsion spring are respectively engaged with the sides of the top terminal 7 and the rotating seat. Two sets of pressing components are provided on the side of the support plate 9 away from the electric push rod 11. The pressing components are used to press down the top terminal 7. The rotating shaft is fixed to the side of the top terminal 7, and the rotating seat is fixed to the bottom of the mounting plate 6. The rotating shaft is rotatably connected to the rotating seat to realize the rotation of the top terminal 7, so that the top terminal... Terminal 7 is angle-adjustable; a torsion spring is movably sleeved on a rotating shaft, with its two ends respectively engaging the top terminal 7 and the rotating seat, providing reset power for the top terminal 7. When the pressing component is released, the top terminal 7 returns to its initial angle under the elastic force of the torsion spring, ensuring accurate docking during the next inspection; the pressing component is located on the side of the support plate 9 away from the electric push rod 11, used to press down the top terminal 7, causing it to rotate around the rotating shaft and adjust to a vertical position. The pressing component includes a bracket 16 fixed to the side of the support plate 9, with an electric push rod fixed to the top of the bracket 16. The output end of the electric actuator 318 moves through the bracket 16 and is fixed with a pressure plate 19. The pressure plate 19 has an integrally formed protrusion 20 on the side facing the electric actuator 5. A through groove 17 is opened on the top of the mounting plate 6 at the top terminal 7. The pressure plate 19 is located in the through groove 17. The bracket 16 is fixed to the side of the support plate 9 to fix the electric actuator 318 and provide an installation base for the lower pressing assembly, ensuring that the electric actuator 318 is firmly installed and runs stably. The electric actuator 318 is fixed to the top of the bracket 16 to provide linear power to drive the pressure plate 19 to move up and down, realizing the connection of the top terminal. The terminal 7 is pressed down and released; the pressure plate 19 is fixed to the output end of the electric push rod 18 and is used to directly press the top terminal 7 and push the top terminal 7 to rotate; the protrusion 20 is integrally formed on the side of the pressure plate 19 and is used to position the top terminal 7. When the top terminal 7 rotates to the vertical position, the protrusion 20 fits against the side of the top terminal 7 to prevent the top terminal 7 from rotating excessively and to ensure that the top terminal 7 remains in a vertical position; the through groove 17 is opened at the top of the mounting plate 6 and at the top terminal 7 to avoid the pressure plate 19 and allow the pressure plate 19 to pass through the mounting plate 6 and accurately press the top terminal 7.

[0029] like Figure 7As shown in this embodiment, a cleaning assembly is provided on the base plate 12. The cleaning assembly is used to clean the contact surface between the top terminal 7 and the high-voltage current transformer. The cleaning assembly includes a rubber strip 22 and two cylinders 21 rotatably connected to the base plate 12. The middle part of the rubber strip 22 is V-shaped and the tip faces the shroud 13. The end of the rubber strip 22 wraps around the cylinder 21 and is fixed to the surface of the cylinder 21. A cleaning strip 23 is fixed to the surface of the part of the rubber strip 22 that wraps around the cylinder 21. The cleaning strip 23 is a felt strip. The cleaning assembly cleans the top terminal 7. When the rubber belt 22 is in position 7, the cleaning tape 23 adheres to the surface of the top terminal 7. A drive assembly is located on the inner side of the V-shape of the rubber belt 22, which drives the rubber belt 22 to move. A rotating shaft 2 is fixed to the bottom of the cylinder 21, and the rotating shaft 2 movably passes through the mounting plate 6 and is fixed to a limit plate. A torsion spring 2 is movably sleeved on the surface of the rotating shaft 2, with both ends of the torsion spring 2 respectively engaged with the surfaces of the mounting plate 6 and the limit plate. The middle of the rubber belt 22 is V-shaped, with the tip pointing towards the fan shroud 13, used to guide the cooling airflow towards the top terminal 7. Simultaneously, it provides an installation carrier for the cleaning belt 23; the cylinder 21 is rotatably connected to the base plate 12 to support the rubber belt 22, allowing the rubber belt 22 to move flexibly, and simultaneously driving the cleaning belt 23 to contact or separate from the top terminal 7; the cleaning belt 23 is made of felt material and is fixed to the part of the rubber belt 22 that wraps around the cylinder 21, for direct contact with the contact surface of the top terminal 7 to clean surface impurities. The felt material is soft and will not damage the surface of the top terminal 7; the drive assembly is set inside the V-shape of the rubber belt 22 to drive the rubber belt 22 to move, thereby driving the cleaning belt 23 to move, improving the cleaning effect, and simultaneously opening the airflow channel; the second rotating shaft is fixed to the bottom of the cylinder 21 and movably passes through the mounting plate 6 to realize the rotation of the cylinder 21. The limiting plate is fixed to the end of the second rotating shaft to limit the axial movement of the second rotating shaft and prevent the cylinder 21 from falling off; the second torsion spring is movably sleeved on the surface of the second rotating shaft, with both ends clamped to the mounting plate 6 and the limiting plate, for providing reset power to the cylinder 21. When the drive assembly stops driving, the cylinder 21 resets under the action of the second torsion spring.

[0030] like Figure 6 As shown, in this embodiment, the drive assembly includes an electric push rod 27. A vertical plate is fixed to the side of the base plate 12, and the electric push rod 27 is fixed to the side of the vertical plate. The output end of the electric push rod 27 moves through the vertical plate and is fixed to the bend in the middle of the rubber belt 22. The vertical plate is fixed to the side of the base plate 12 to fix the electric push rod 27, providing an installation base for the drive assembly and ensuring that the electric push rod 27 is firmly installed and runs stably. The electric push rod 27 is fixed to the side of the vertical plate to provide linear power, drive the bend in the middle of the rubber belt 22 to move, and then drive the rubber belt 22 as a whole to move, thereby realizing the movement and cleaning of the cleaning belt 23 and the opening of the airflow channel.

[0031] like Figure 7As shown in this embodiment, an inner cavity 24 is provided inside the rubber belt 22 and located at the cleaning belt 23. The inner cavity 24 is filled with high-pressure gas, which causes the rubber belt 22 to expand outward under the action of high-pressure gas, thereby causing the cleaning belt 23 to fit more tightly against the surface of the top terminal 7, improving the cleaning ability of the cleaning belt 23 on the contact surface of the top terminal 7, and ensuring that impurities can be completely removed.

[0032] like Figure 7 As shown in this embodiment, multiple support blocks 25 are symmetrically fixed to the surface of the V-shaped part of the rubber belt 22. A cloth strip 26 is fixed to the side of the support block 25. The side of the cloth strip 26 away from the support block 25 is fixed to the surface of the rubber belt 22. The air outlet 15 has a small aperture at the rubber belt 22 and a large aperture at the top terminal 7. The support blocks 25 are symmetrically fixed to the surface of the V-shaped part of the rubber belt 22 to fix the cloth strip 26 and ensure that the cloth strip 26 is firmly installed. The cloth strip 26 is fixed between the support block 25 and the rubber belt 22 and is used to swing under the action of airflow, drive the rubber belt 22 to vibrate, shake off the impurities attached to the cleaning belt 23, and ensure the cleaning ability of the cleaning belt 23. The aperture of the air outlet 15 is designed to be small near the rubber belt 22 and large near the top terminal 7 to concentrate the airflow and allow more airflow to flow to the top terminal 7, thereby improving the heat dissipation effect.

[0033] like Figure 8 As shown in this embodiment, the top terminal 7 has multiple through holes 28 on its side. The through holes 28 are provided on the side of the top terminal 7 for the airflow blown out by the heat dissipation mechanism 8 to pass through, thereby increasing the contact area between the airflow and the top terminal 7, further improving the heat dissipation capacity of the top terminal 7, accelerating the heat dissipation of the top terminal 7, and preventing the top terminal 7 from overheating.

[0034] Working principle: Place the high-voltage current transformer to be tested on the conveyor 2, start the conveyor 2, and transport the high-voltage current transformer to the top terminal 7. At the same time, ensure that the terminals of the high-voltage current transformer are accurately connected to the two side terminals 3 and electrically connected. Then, stop the conveyor 2 to complete the feeding and side wiring positioning. Start the electric push rod 5. The electric push rod 5 pushes the mounting plate 6 downward, causing the two top terminals 7 to descend synchronously until the top terminals 7 are tightly connected to the connection end of the high-voltage current transformer and achieve electrical connection. At this time, the calibrator 4 starts and automatically verifies the high-voltage current transformer through the side terminals 3 and the top terminals 7, and monitors and records the verification data in real time. After the calibration is completed, the calibrator 4 stops working, the electric push rod 5 is started, which drives the mounting plate 6 and the top terminal 7 to reset upwards, and the top terminal 7 is separated from the high-voltage current transformer; then the conveyor 2 is started to transport the calibrated high-voltage current transformer to the outside of the housing 1, waiting for manual removal, while preparing for the next calibration. Before the next high-voltage current transformer is fed, the electric push rod 18 of the pressing assembly is activated. The electric push rod 18 pushes the pressure plate 19 downward. The pressure plate 19 passes through the through slot 17 of the mounting plate 6 and its bottom abuts against the top of the top terminal 7. The pressure continues to be applied so that the top terminal 7 rotates around the pivot, and the torsion spring deforms until the protrusion 20 of the pressure plate 19 fits against the side of the top terminal 7. The top terminal 7 is in a vertical state and separates from the mounting plate 6, increasing the contact area between the top terminal 7 and the air to prepare for heat dissipation. The electric push rod 11 of the heat dissipation mechanism 8 is activated. The electric push rod 11 pushes the base plate 12 to move towards the top terminal 7, causing the fan cover 13 and the cleaning component to move closer simultaneously. The high-pressure gas in the inner cavity 24 of the rubber belt 22 causes the rubber belt 22 to expand outward, causing the cleaning belt 23 to fit tightly against the surface of the top terminal 7, cleaning the contact surface between the top terminal 7 and the transformer, removing surface dust and impurities. At the same time, the fan cover 13 moves closer to the top terminal 7, and the fan 14 is activated. Outside air enters through the air inlet of the fan cover 13 and is blown out from the air outlet 15. The air outlet 15 has a smaller diameter near the rubber belt 22 and a larger diameter near the top terminal 7, so that the airflow is concentrated and flows towards the top terminal 7. The airflow passes through the through hole 28 of the top terminal 7, further increasing the contact area and accelerating the heat dissipation of the top terminal 7. After the electric push rod 21 stops, the electric push rod 427 of the drive assembly is activated. The electric push rod 427 pushes the bent part in the middle of the rubber belt 22 towards the air cover 13. The end of the rubber belt 22 drives the cylinder 21 to rotate around the rotating shaft 2. The torsion spring 2 deforms, and the cleaning belt 23 is separated from the surface of the top terminal 7, opening the airflow channel between the cylinder 21 and the top terminal 7, so that the airflow flows more smoothly through the top terminal 7, enhancing the heat dissipation effect. At the same time, the airflow blown out of the air outlet 15 drives the cloth strip 26 on the rubber belt 22 to swing. The cloth strip 26 drives the rubber belt 22 to vibrate, shaking off the dust attached to the cleaning belt 23, ensuring the cleaning ability of the cleaning belt 23, without the need for manual cleaning. After heat dissipation and cleaning are completed, the fan 14 is turned off, and the electric push rods 27, 11, and 18 are started in sequence to reset. The electric push rod 27 retracts, and the rubber belt 22 and cylinder 21 are reset under the action of the torsion spring 2. The cleaning belt 23 returns to its initial position. The electric push rod 11 retracts, moving the base plate 12 and the fan cover 13 away from the top terminal 7. The electric push rod 18 retracts, and the pressure plate 19 is disengaged from the top terminal 7. The top terminal 7 is reset under the action of the torsion spring 1. After the next high-voltage current transformer is placed on the conveyor 2, the above steps are repeated to carry out the next round of automated verification work.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automated calibration device for high-voltage current transformers, characterized in that, include: The housing (1) has an inlet hole on its side and a conveyor (2) is installed at the inlet hole. The conveyor (2) is used to transport the high voltage current transformer. An electric push rod (5) is fixed on the top of the inner wall of the housing (1). An installation plate (6) is fixed on the output end of the electric push rod (5). Two top terminals (7) are symmetrically arranged at the bottom of the installation plate (6). Two side terminals (3) are installed on the end of the conveyor (2) away from the inlet hole through a support. A calibrator (4) is fixed inside the housing (1) through a support plate. The calibrator (4) is electrically connected to the two side terminals (3) and the two top terminals (7) respectively. Heat dissipation mechanism (8) is used to dissipate heat from the two top terminals (7).

2. The automated calibration device for high-voltage current transformers according to claim 1, characterized in that, The heat dissipation mechanism (8) includes a support plate (9) fixed to the inner wall of the housing (1), a connecting frame (10) fixed to the side of the support plate (9), an electric push rod (11) fixed to the bottom of the connecting frame (10), a base plate (12) fixed to the output end of the electric push rod (11), a fan hood (13) fixed to the side of the base plate (12) away from the mounting plate (6), the inside of the fan hood (13) is hollow, multiple air inlets are opened on the side of the fan hood (13) away from the mounting plate (6), a fan (14) is fixed at the air inlet of the fan hood (13), and an air outlet (15) is opened on the side of the fan hood (13) away from the fan.

3. The automated calibration device for high-voltage current transformers according to claim 2, characterized in that, The top terminal (7) is fixed with a rotating shaft, and the bottom of the mounting plate (6) is fixed with a rotating seat. The rotating shaft is rotatably connected to the side of the rotating seat. A torsion spring is movably sleeved on the rotating shaft. The two ends of the torsion spring are respectively snapped into the sides of the top terminal (7) and the rotating seat. Two sets of pressing components are provided on the side of the support plate (9) away from the electric push rod (11). The pressing components are used to press down the top terminal (7).

4. The automated calibration device for high-voltage current transformers according to claim 3, characterized in that, The pressing assembly includes a bracket (16) fixed to the side of the support plate (9). An electric push rod three (18) is fixed to the top of the bracket (16). The output end of the electric push rod three (18) moves through the bracket (16) and is fixed with a pressure plate (19). The pressure plate (19) has a protrusion (20) integrally formed on the side facing the electric push rod one (5). A through groove (17) is opened on the top of the mounting plate (6) and at the top terminal (7). The pressure plate (19) is located at the through groove (17).

5. The automated calibration device for high-voltage current transformers according to claim 3, characterized in that, A cleaning component is provided on the base plate (12), which is used to clean the contact surface between the top terminal (7) and the high voltage current transformer.

6. The automated calibration device for high-voltage current transformers according to claim 5, characterized in that, The cleaning assembly includes a rubber belt (22) and two cylinders (21) rotatably connected to the base plate (12). The middle part of the rubber belt (22) is V-shaped and the tip faces the wind shield (13). The end of the rubber belt (22) wraps around the cylinder (21) and is fixed to the surface of the cylinder (21). A cleaning belt (23) is fixed to the surface of the part of the rubber belt (22) that wraps around the cylinder (21). The cleaning belt (23) is a felt belt. When cleaning the top terminal (7), the cleaning belt (23) is attached to the surface of the top terminal (7). A driving assembly is provided on the inner side of the rubber belt (22) in the V-shape. The driving assembly is used to drive the rubber belt (22) to move. A rotating shaft is fixed to the bottom of the cylinder (21). The rotating shaft movably passes through the mounting plate (6) and is fixed to the limit plate. A torsion spring is movably sleeved on the surface of the rotating shaft. The two ends of the torsion spring are respectively snapped onto the surface of the mounting plate (6) and the limit plate.

7. The automated calibration device for high-voltage current transformers according to claim 6, characterized in that, The drive assembly includes an electric push rod four (27), a vertical plate is fixed to the side of the base plate (12), the electric push rod four (27) is fixed to the side of the vertical plate, and the output end of the electric push rod four (27) moves through the vertical plate and is fixed at the bend in the middle of the rubber belt (22).

8. The automated calibration device for high-voltage current transformers according to claim 6, characterized in that, An inner cavity (24) is provided inside the rubber belt (22) and located at the cleaning belt (23), and the inner cavity (24) is filled with high-pressure gas.

9. The automated calibration device for high-voltage current transformers according to claim 6, characterized in that, Multiple support blocks (25) are symmetrically fixed on the surface of the V-shaped part of the rubber strip (22). A cloth strip (26) is fixed on the side of the support block (25). The side of the cloth strip (26) away from the support block (25) is fixed on the surface of the rubber strip (22). The air outlet (15) is located in the rubber strip (22) with a small aperture and the air outlet (15) is located in the top terminal (7) with a large aperture.

10. The automated calibration device for high-voltage current transformers according to claim 2, characterized in that, The top terminal (7) has multiple through holes (28) on its side.

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