Modular 10kv combined instrument transformer for metering

Abstract

The present application relates to the technical fields of metering combined mutual inductor, in particular to a modular metering 10kV combined mutual inductor, which comprises a mutual inductor body, a mounting seat fixed at the bottom end of the mutual inductor body, and a terminal box body fixed outside the mutual inductor body. By setting the opening and closing assembly, the modular metering 10kV combined mutual inductor can realize the quick opening and closing of the terminal box cover without disassembling the screws one by one, greatly simplifying the outdoor installation and maintenance process, especially suitable for high-altitude operation scenes. By controlling the rotating direction of the rotating block, the terminal box cover can be fixed or unlocked, avoiding the hidden danger of screw loss, and significantly improving the installation and maintenance efficiency of the terminal box cover. At the same time, by setting the limiting rod and the extrusion positioning assembly, the terminal box body inside the terminal box cover can be limited after being closed, avoiding loosening caused by factors such as vibration and temperature change during use, and ensuring the connection stability.

Description

Technical Field

[0001] This invention relates to the field of metering combined instrument transformer technology, specifically a modular 10kV combined instrument transformer for metering. Background Technology

[0002] The existing modular 10kV combined instrument transformer for metering adopts a functional decomposition design concept, mainly composed of multiple independent functional modules and auxiliary structures. The core components include a voltage transformer module and a current transformer module, which respectively undertake the metering functions of high-voltage voltage reduction and high-voltage current conversion. The voltage transformer module converts high voltage into a low-voltage signal through the electromagnetic induction of the iron core and windings, while the current transformer module converts the large line current into a small current signal suitable for the metering instrument through similar electromagnetic principles. The equipment also includes an insulating support structure to separate different modules and ensure electrical insulation performance, avoiding the risk of phase-to-phase discharge. The integrated junction box body serves as the secondary circuit hub, responsible for integrating the signals output from both types of modules and establishing a connection with external metering instruments through internal terminals. The modules are assembled and combined through standardized mechanical and electrical interfaces, allowing for flexible addition, removal, or replacement of modules according to metering needs. Its core operation relies on the principle of electromagnetic induction to complete signal conversion and transmission, providing accurate data support for energy metering.

[0003] When installing existing modular 10kV combined instrument transformers for outdoor metering, the junction box cover is often secured with multiple screws. This requires tightening each screw individually, a cumbersome and inefficient process, especially in high-altitude work environments where screws are prone to falling or being lost due to operator error, further complicating installation. Simultaneously, in harsh environments such as high humidity, coastal areas, and industrial zones, the junction box itself faces severe corrosion problems: moisture in the air easily seeps into the box and condenses at the contact points between bolts and wires; salt spray in coastal areas and acidic gases and dust in industrial areas adhere to the contact points, causing metal corrosion and increased contact resistance, leading to unstable signal transmission, affecting metering accuracy, and even causing equipment failure. However, to ensure heat dissipation within the junction box through airflow and prevent insulation aging and component damage due to high temperatures, a completely sealed structure is not feasible. This contradiction between sealing and heat dissipation results in significant shortcomings of existing combined instrument transformers in harsh outdoor environments. Summary of the Invention

[0004] The purpose of this invention is to provide a modular 10kV combined instrument transformer for metering, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a modular 10kV combined instrument transformer for metering, comprising an instrument transformer body, a mounting base fixed to the bottom of the instrument transformer body, and a junction box body fixed to the outside of the instrument transformer body. A terminal block is fixedly installed on the inner wall of the junction box body, and a plurality of wiring holes are equally spaced inside the terminal block. A junction box cover is fitted and sealed to the inner side of the junction box body away from the terminal block opening. An opening and closing assembly is provided inside the junction box body near the junction box cover. A limiting cylinder is fixedly installed on the side of the junction box cover near each wiring hole. A compression positioning assembly and a liquid injection assembly are provided at one end of the limiting cylinder. The opening and closing assembly includes a rotating rod and a rotating shaft. The rotating rod is vertically rotatably installed inside the junction box body near the edge of the junction box cover, and the rotating shaft is located on the top side of the junction box cover near the limiting cylinder. The liquid injection assembly includes a limiting rod and a piston block. The limiting rod is located inside the limiting cylinder, and the piston block is fixedly installed outside one end of the limiting rod. The edge of the piston block is slidably and sealingly connected to the inner wall of the limiting cylinder.

[0006] Furthermore, two limiting seats are fixedly installed through both ends of the rotating shaft, and one end of each of the two limiting seats is fixedly installed on the outside of the junction box cover. A sliding plate is provided through the outside of the rotating shaft near each limiting seat, and the rotating shaft is rotatably connected to the sliding plate. A slide rail is fixedly installed on the inner wall of the junction box body near the sliding plate, and the sliding plate is laterally slidably engaged with the outside of the slide rail.

[0007] Furthermore, a limiting gear is fixedly installed on the top of the rotating rod near one of the limiting seats, a limiting rack is meshed with one side of the limiting gear, the limiting rack is fixedly installed on the outside of the bottom end of the slide plate, and a first worm gear is fixedly installed through the outside of the rotating rod near the bottom end, and a first worm is meshed with one side of the first worm gear.

[0008] Furthermore, a first rotating seat is rotatably mounted through both ends of the first worm gear. One end of the first rotating seat is fixedly mounted on the bottom wall of the junction box body, and a rotating block is fixedly mounted on one end of the first worm gear. One end of the rotating block is rotatably mounted through the outside of the junction box body.

[0009] Furthermore, a drive rack is fixedly installed on the top wall of the junction box body near the junction box cover. A sprocket is fixedly inserted through the outside of the end of the rotating shaft near the drive rack. A drive rod is rotatably installed on the outside of the end of the sliding plate away from the drive rack. A sprocket is also fixedly inserted through the outside of the drive rod. A chain is connected between the sprocket outside the drive rod and the sprocket outside the rotating shaft. A second worm gear is fixedly inserted through the outside of the drive rod.

[0010] Furthermore, a second worm is meshed with one side of the second worm gear, and a second rotating seat is rotatably mounted on both ends of the second worm. One end of the second rotating seat is fixedly mounted on the outside of one side of the slide plate, and a drive gear is fixedly mounted on the end of the second worm near the drive rack.

[0011] Furthermore, the extrusion positioning assembly includes four positioning blocks, which are equally spaced and fixedly installed around the outer periphery of the end of the limiting rod away from the piston block. Each positioning block is L-shaped, and the four positioning blocks are cross-shaped when viewed from the side.

[0012] Furthermore, a positioning disc is provided through the side of the limiting rod near the opening end of the limiting cylinder, and the limiting rod and the positioning disc are slidably engaged. The positioning disc is fixedly installed outside the opening end of the limiting cylinder. A compression spring is sleeved on the outside of the limiting rod, and the two ends of the compression spring are respectively fixedly installed outside one side of the positioning disc and outside one side of the piston block.

[0013] Furthermore, a one-way inlet valve pipe is fixedly installed inside the end of the limiting cylinder near the junction box cover, and a liquid storage box is fixedly installed on the outside of the side of the junction box cover away from the limiting cylinder. A liquid filling cap is threaded through the top of the liquid storage box, and the input end of the one-way inlet valve pipe is fixedly installed inside the bottom end of the liquid storage box. A liquid guiding channel is opened through the limiting rod and the piston block. A one-way valve is fixedly installed inside the end of the limiting rod near the positioning block, and the one-way valve is connected to the liquid guiding channel.

[0014] Furthermore, each of the positioning blocks has a drainage channel inside, one end of which is connected to one end of the liquid guiding channel. A wire hole is provided through the middle of the bottom of the junction box body, and an abutment block is slidably fitted inside the wire hole. One end of the abutment block is fixedly installed on the outside of the bottom of the junction box cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The modular 10kV combined instrument transformer for metering allows for quick opening and closing of the junction box cover without the need to disassemble each screw individually. This significantly simplifies outdoor installation and maintenance, making it particularly suitable for high-altitude operations. Simply controlling the rotation direction of the rotating block is sufficient to fix or unlock the junction box cover, preventing the risk of screws falling out and being lost. This significantly improves the efficiency of junction box cover installation and maintenance. Furthermore, the limit rod and clamping positioning component ensure that the wiring bolts inside the junction box are stopped after the cover is closed, preventing loosening caused by vibration, temperature changes, or other factors during use, thus guaranteeing connection stability.

[0017] 2. Through the coordinated operation of the limiting rod, the squeezing positioning component, and the liquid injection component, this modular 10kV combined instrument transformer for metering can achieve automated and precise application of the anti-corrosion conductive agent. During the opening of the junction box cover, the components trigger the liquid injection component to automatically extract the anti-corrosion conductive agent. When the junction box cover closes, the squeezing positioning component drives the limiting rod, pushing the liquid injection component to evenly drip the stored anti-corrosion conductive agent onto the connection points between the bolts and wire terminals. This forms a dense protective film at the connection points, effectively isolating moisture, salt spray, acidic gases, and dust corrosion, inhibiting metal corrosion and oxidation reactions, maintaining stable contact resistance, ensuring accurate voltage and current signal transmission, and avoiding metering errors. Simultaneously, the wiring holes at the bottom of the junction box body allow for some airflow, without affecting heat dissipation, resolving the traditional contradiction between sealing and heat dissipation, and significantly extending the equipment's service life. It is particularly suitable for harsh environments such as high humidity, coastal areas, and industrial zones. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0020] Figure 3 This is a partial cross-sectional perspective view of the junction box cover and the terminal block of the present invention.

[0021] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point B;

[0022] Figure 5 This is a three-dimensional structural diagram of the rotating rod and the limiting gear of the present invention;

[0023] Figure 6 This is a three-dimensional structural diagram of the sprocket and chain of the present invention;

[0024] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C;

[0025] Figure 8 Demonstration diagrams showing the movement of the junction box cover by a sliding plate and the rotation of the junction box cover by a rotating shaft;

[0026] Figure 9 This is a partial cross-sectional three-dimensional structural schematic diagram of the limiting cylinder and limiting rod of the present invention;

[0027] Figure 10 This is a partial cross-sectional three-dimensional structural schematic diagram of the limiting rod and piston block of the present invention;

[0028] Figure 11 For the present invention Figure 10 Enlarged structural diagram at point D;

[0029] Figure 12 This is a schematic diagram demonstrating the contact between the positioning block, bolt, and terminal block of the present invention and the fluid guiding process.

[0030] Figure 13 This is a three-dimensional structural diagram of the thread hole and the contact block of the present invention.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Current transformer body; 2. Mounting base; 3. Junction box body; 4. Terminal block; 5. Wiring hole; 6. Junction box cover; 7. Slide rail; 8. Slide plate; 9. Rotating shaft; 10. Limiting seat; 11. Limiting rack; 12. Rotating rod; 13. Limiting gear; 14. First worm gear; 15. First worm; 16. First rotating seat; 17. Rotating block; 18. Drive rack; 19. Sprocket; 20. Chain; 21. Drive rod; 22. Second worm gear; 23. Second rotating seat; 24. Second worm; 25. Drive gear; 26. Limiting cylinder; 27. Limiting rod; 28. Positioning block; 29. ​​Piston block; 30. Positioning plate; 31. One-way liquid inlet valve pipe; 32. Liquid storage box; 33. Liquid guiding channel; 34. One-way valve; 35. Drain channel; 36. Compression spring; 37. Wire hole; 38. Contact block. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figure 1 - Figure 9 and Figure 13A modular 10kV combined instrument transformer for metering includes an instrument transformer body 1, a mounting base 2 fixed to the bottom of the instrument transformer body 1, and a junction box body 3 fixed to the outside of the instrument transformer body 1. A terminal block 4 is fixedly installed on the inner wall of the junction box body 3. A plurality of wiring holes 5 are equally spaced inside the terminal block 4. A junction box cover 6 is fitted and sealed to the inner side of the opening end of the junction box body 3 away from the terminal block 4. An opening and closing assembly is provided inside the junction box body 3 near the junction box cover 6. A limit cylinder 26 is fixedly installed on the side of the junction box cover 6 near each wiring hole 5. A squeezing positioning assembly and a liquid injection assembly are provided at one end of the limit cylinder 26. The opening and closing assembly includes a rotating rod 12 and a rotating shaft 9. The rotating rod 12 is vertically rotatably installed inside the junction box body 3 near the edge of the junction box cover 6. The rotating shaft 9 is located on the top side of the junction box cover 6 near the limit cylinder 26.

[0035] Two limit seats 10 are fixedly installed through both ends of the rotating shaft 9. One end of each limit seat 10 is fixedly installed on the outside of the junction box cover 6. A slide plate 8 is provided through the outside of the rotating shaft 9 near each limit seat 10, and the rotating shaft 9 is rotatably connected to the slide plate 8. A slide rail 7 is fixedly installed on the inner wall of the junction box body 3 near the slide plate 8. The slide plate 8 is laterally slidably engaged with the outside of the slide rail 7.

[0036] A limiting gear 13 is fixedly installed on the top of one of the limiting seats 10 near the rotating rod 12. A limiting rack 11 is meshed with one side of the limiting gear 13. The limiting rack 11 is fixedly installed on the outside of the bottom end of the slide plate 8. A first worm gear 14 is fixedly installed through the outside of the rotating rod 12 near the bottom end. A first worm 15 is meshed with one side of the first worm gear 14.

[0037] Both ends of the first worm gear 15 are rotatably mounted with a first rotating seat 16. One end of the first rotating seat 16 is fixedly mounted on the bottom wall of the junction box body 3. One end of the first worm gear 15 is fixedly mounted with a rotating block 17. One end of the rotating block 17 is rotatably mounted on the outside of the junction box body 3.

[0038] A drive rack 18 is fixedly installed on the top wall of the junction box body 3 near the junction box cover 6. A sprocket 19 is fixedly installed through the outside of the end of the rotating shaft 9 near the drive rack 18. A drive rod 21 is rotatably installed on the outside of the end of the slide plate 8 away from the drive rack 18. A sprocket 19 is also fixedly installed through the outside of the drive rod 21. A chain 20 is connected between the sprocket 19 outside the drive rod 21 and the sprocket 19 outside the rotating shaft 9. A second worm gear 22 is fixedly installed through the outside of the drive rod 21.

[0039] A second worm 24 is meshed and connected to one side of the second worm gear 22. A second rotating seat 23 is rotatably mounted through both ends of the second worm 24. One end of the second rotating seat 23 is fixedly mounted on the outside of one side of the slide plate 8. A drive gear 25 is fixedly mounted on the end of the second worm 24 near the drive rack 18.

[0040] The extrusion positioning assembly includes four positioning blocks 28, which are equally spaced and fixedly installed around the outer periphery of the end of the limiting rod 27 away from the piston block 29. Each positioning block 28 is L-shaped, and the four positioning blocks 28 are cross-shaped when viewed from the side.

[0041] A positioning disc 30 is provided through the side of the limiting rod 27 near the opening end of the limiting cylinder 26, and the limiting rod 27 and the positioning disc 30 are slidably engaged. The positioning disc 30 is fixedly installed outside the opening end of the limiting cylinder 26. A compression spring 36 is sleeved on the outside of the limiting rod 27. The two ends of the compression spring 36 are respectively fixedly installed on the outside of one side of the positioning disc 30 and the outside of one side of the piston block 29.

[0042] A wire-passing hole 37 is provided through the middle of the bottom of the junction box body 3. An abutment block 38 is slidably fitted inside the wire-passing hole 37. One end of the abutment block 38 is fixedly installed on the outside of the bottom of the junction box cover 6.

[0043] In this embodiment, when performing maintenance or wiring operations on the modular metering 10kV combined current transformer, the rotating block 17 outside the junction box body 3 is first rotated using a hex wrench. The rotating block 17 drives the first worm gear 15 fixed thereto to rotate synchronously. Since the first worm gear 15 meshes with the first worm wheel 14 outside the rotating rod 12, and both ends of the first worm gear 15 are stably supported on the bottom wall of the junction box body 3 by the first rotating seat 16, the first worm wheel 14 drives the rotating rod 12 to rotate vertically as the first worm gear 15 rotates. The limiting gear 13 at the top of the rotating rod 12 meshes with the limiting rack 11 at the bottom of the slide plate 8. When the limiting gear 13 rotates, it drives the limiting rack 11 to move laterally, thereby driving the slide plate 8 to slide smoothly on the slide rail 7 on the inner wall of the junction box body 3. The slide plate 8 then drives the junction box cover 6 to move laterally synchronously through the cooperation of the rotating shaft 9 and the limiting seat 10, so that the junction box cover 6 gradually moves out of the junction box body 3. The "lateral movement first" design avoids collisions or interference between the outer limiting cylinder 26 and the inner wall of the junction box body 3 when the junction box cover 6 is flipped directly, eliminating movement obstacles and ensuring smooth opening. At the same time, it eliminates the need to disassemble the multiple screws of the traditional junction box cover 6 one by one. The opening process can be started by rotating a single component, which greatly simplifies the operation steps of outdoor high-altitude operations, completely avoids the risk of screws falling and being lost, and significantly improves installation and maintenance efficiency.

[0044] As the sliding plate 8 continues to move the junction box cover 6 out, the contact block 38 at the bottom of the junction box cover 6 will gradually disengage from the inner wall of the wire-passing hole 37 at the bottom of the junction box body 3. At this time, the wire-passing hole 37 is in a fully open state, which makes it convenient for subsequent operators to pass external wires through the wire-passing hole 37 and connect them to the wiring hole 5 of the terminal block 4, avoiding the wires being limited by the contact block 38 and affecting the wire-passing operation. When the junction box cover 6 moves out to a certain distance, the drive gear 25 on the outside of the drive rod 21 rotatably mounted on one end of the sliding plate 8 will mesh with the drive rack 18 fixed on the top wall of the junction box body 3. At this time, the sliding plate 8 continues to move laterally, which will drive the drive gear 25 to roll on the drive rack 18 and rotate. The drive gear 25 drives the second worm gear 24 fixed to it to rotate synchronously. The second worm 24 is stably supported on one side of the slide plate 8 by the second rotating seat 23 at both ends. The second worm 24 meshes with the second worm wheel 22 outside the drive rod 21. The second worm wheel 22 rotates with the second worm 24, which drives the drive rod 21 to rotate. The sprocket 19 outside the drive rod 21 is connected to the sprocket 19 outside the rotating shaft 9 through the chain 20, which in turn drives the rotating shaft 9 to rotate around its own axis. The rotating shaft 9 then drives the junction box cover 6 to flip open through the limit seat 10, which finally exposes the junction box 4 and the wiring hole 5 inside the junction box body 3, making it convenient for operators to perform wiring or maintenance work. The entire opening process is automated through mechanical linkage, eliminating the need for manual flipping of the junction box cover 6, further reducing the difficulty and safety risks of high-altitude operations.

[0045] After maintenance or wiring is completed, the rotating block 17 is rotated in the reverse direction. Through the reverse linkage of the above-mentioned transmission structure, the sliding plate 8 first drives the junction box cover 6 to flip and reset, and then moves laterally into the junction box body 3. During the movement, the limiting rod 27 in the limiting cylinder 26 on the side of the junction box cover 6 near the wiring hole 5 will gradually contact the wiring bolt at the wiring hole 5. The L-shaped positioning block 28 first fits against the outer circumference of the bolt. As the junction box cover 6 continues to move in, the limiting rod 27 slides into the limiting cylinder 26 due to the bolt's contact. The compression spring 36 outside the limiting rod 27 is pulled by the positioning plate 30 and the piston block 29 and is in a stretched state. The stretched compression spring 36 generates a reverse elastic force, which pushes the limiting rod 27 through the piston block 29, so that the positioning block 28 tightly contacts the cross groove outside the bolt, forming an elastic limit. This effectively offsets the influence of factors such as vibration and temperature changes during equipment operation on the bolt, prevents the bolt from loosening and causing poor wiring contact, ensures the stability of current and voltage signal transmission, and avoids measurement errors. At the same time, the contact block 38 at the bottom of the junction box cover 6 will slide into the wire hole 37 and fit tightly with the wire inside the wire hole 37. This not only limits the wire and prevents it from shaking and pulling at the connection point, but also forms a partial seal at the wire hole 37 to block external dust and moisture from entering. At the same time, it maintains the air circulation channel between the wire hole 37 and the inside of the junction box body 3, ensuring that the heat inside the junction box body 3 can be dissipated through air convection, avoiding the high temperature caused by complete sealing and accelerated insulation aging.

[0046] Example 2: Please refer to Figure 9 - Figure 12 This embodiment further describes Example 1. The liquid injection assembly includes a limiting rod 27 and a piston block 29. The limiting rod 27 is disposed inside the limiting cylinder 26, and the piston block 29 is fixedly installed on the outside of one end of the limiting rod 27. The edge of the piston block 29 is slidably and sealingly connected to the inner wall of the limiting cylinder 26.

[0047] A one-way inlet valve pipe 31 is fixedly installed inside the end of the limiting cylinder 26 near the junction box cover 6. A liquid storage box 32 is fixedly installed outside the side of the junction box cover 6 away from the limiting cylinder 26. A liquid filling cap is threaded through the top of the liquid storage box 32. The input end of the one-way inlet valve pipe 31 is fixedly installed inside the bottom end of the liquid storage box 32. A liquid guiding channel 33 is opened through the limiting rod 27 and the piston block 29. A one-way valve 34 is fixedly installed inside the end of the limiting rod 27 near the positioning block 28, and the one-way valve 34 is connected to the liquid guiding channel 33.

[0048] Each positioning block 28 has a drainage channel 35 inside, and one end of the drainage channel 35 is connected to one end of the liquid guiding channel 33.

[0049] In this embodiment, when the rotating block 17 moves the junction box cover 6 laterally out, the resistance of the bolt to the limiting rod 27 disappears, and the compression spring 36, which was stretched when it was moved in, releases its elastic potential energy, pulling the piston block 29 to slide back along the inner wall of the limiting cylinder 26 towards the positioning plate 30. The piston block 29 and the inner wall of the limiting cylinder 26 are slidably sealed to ensure that a stable negative pressure is formed inside the limiting cylinder 26. At this time, the anti-corrosion conductive agent stored in the liquid storage box 32 is drawn into the limiting cylinder 26 through the one-way liquid inlet valve pipe 31 under the action of negative pressure, and is pre-stored along the liquid guiding channel 33 inside the limiting rod 27 and the piston block 29, in preparation for subsequent liquid injection. The threaded filling cap at the top of the liquid storage box 32 allows operators to replenish the conductive agent regularly, and its good sealing performance prevents the conductive agent from getting damp, deteriorating, or leaking, ensuring that the conductive agent maintains its excellent performance over a long period of time. The one-way conduction characteristic of the one-way liquid inlet valve pipe 31 can prevent the drawn-in conductive agent from flowing back into the liquid storage box 32, ensuring accurate and stable extraction volume each time and avoiding insufficient liquid injection due to backflow.

[0050] After the wiring is completed, the rotating block 17 is rotated in the opposite direction, and the junction box cover 6 begins to move laterally into the junction box body 3. This first triggers the action of the squeezing positioning component in Embodiment 1: the cross-shaped positioning block 28 first fits tightly against the outer periphery of the wiring bolt at the wiring hole 5. This structural design allows the four positioning blocks 28 to form a ring-shaped positioning from all around the bolt, ensuring that the limiting rod 27 is coaxially aligned with the bolt, and also allowing the contact surface of the positioning block 28 to accurately correspond to the connection part of the bolt and the wire terminal, providing a precise positioning reference for the conductive agent dripping, and avoiding waste or pollution caused by the conductive agent deviating from the target area. As the junction box cover 6 continues to move in, the limiting rod 27 slides into the limiting cylinder 26 due to the contact with the bolt, causing the piston block 29 to move synchronously. At this time, the compression spring 36 is stretched again, the internal space of the limiting cylinder 26 shrinks, and the pressure increases, causing the pre-stored anti-corrosion conductive agent to flow along the liquid guiding channel 33 to the front end of the limiting rod 27. After the conductive agent flows through the one-way valve 34 at the front end of the limiting rod 27, it smoothly enters the drainage channel 35 inside the four positioning blocks 28, and finally sprays out evenly from the outlet of the drainage channel 35, fully covering the connection part between the bolt and the wire terminal.

[0051] This automated liquid injection design boasts several innovative technological advantages: First, the encircling structure of the positioning block 28 and the distributed layout of the drainage channels 35 ensure 360° coverage of the connection area with the conductive agent, avoiding uneven coverage and omissions caused by manual injection and ensuring the integrity of the protective film. Second, the dense protective film formed by the conductive agent effectively isolates moisture, salt spray, acidic gases, and dust from contact with the metal surface, inhibiting electrochemical corrosion and oxidation reactions, maintaining stable contact resistance over the long term, avoiding signal transmission distortion caused by poor contact, and ensuring that the metering accuracy always meets requirements. Third, the liquid injection action is mechanically linked to the opening and closing action of the junction box cover 6, eliminating the need for additional drive components or manual operation. The simplified operation process is particularly suitable for outdoor high-altitude operations, reducing the labor intensity of operators. Fourth, the entire liquid injection process does not rely on the complete sealing of the junction box body 3. Combined with the air circulation channel of the wire hole 37 reserved in Embodiment 1, it not only achieves efficient anti-corrosion protection, but also ensures that the internal heat of the junction box body 3 is dissipated normally, perfectly solving the contradiction between sealing and heat dissipation in traditional equipment. Fifth, the liquid storage box 32 has sufficient capacity and can be repeatedly replenished with conductive agent. Combined with the precise liquid injection design of the positioning block 28, a single liquid injection can meet the long-term protection requirements, greatly reducing the frequency of equipment maintenance. It is particularly suitable for long-term use in harsh environments such as high humidity, coastal areas, and industrial areas, significantly extending the service life and stable operation cycle of the combined current transformer.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular 10 kV combined instrument transformer for metering, comprising a transformer body (1), a mounting seat (2) fixed at the bottom end of the transformer body (1), and a terminal box body (3) fixed outside the transformer body (1), characterized in that: The inner wall of the junction box body (3) is fixedly provided with a junction seat (4), a plurality of junction holes (5) are equidistantly arranged in the junction seat (4), the inner side of the opening end of the junction box body (3) away from the junction seat (4) is sealingly provided with a junction box cover (6), the inside of the junction box body (3) close to the junction box cover (6) is provided with an opening and closing assembly, the side of the junction box cover (6) close to each junction hole (5) is fixedly provided with a limiting cylinder (26), and one end of the limiting cylinder (26) is provided with an extrusion positioning assembly and a liquid injection assembly; The opening and closing assembly comprises a rotating rod (12) and a rotating shaft (9), the rotating rod (12) is vertically rotatably arranged in the inside of the edge of the junction box body (3) close to the junction box cover (6), and the rotating shaft (9) is arranged on the top side of the junction box cover (6) close to the limiting cylinder (26); The liquid injection assembly comprises a limiting rod (27) and a piston block (29), the limiting rod (27) is arranged in the inside of the limiting cylinder (26), the piston block (29) is fixedly arranged on one end of the outside of the limiting rod (27), and the edge of the piston block (29) is slidingly and sealingly connected with the inner wall of the limiting cylinder (26); Both ends of the rotating shaft (9) are fixedly provided with two limiting seats (10), one end of each of the two limiting seats (10) is fixedly arranged on the outside of the junction box cover (6), the outside of the side of the rotating shaft (9) close to each limiting seat (10) is fixedly provided with a sliding plate (8), and the rotating shaft (9) is rotatably connected with the sliding plate (8), the inner wall of the side of the junction box body (3) close to the sliding plate (8) is fixedly provided with a sliding rail (7), and the sliding plate (8) is transversely and slidingly arranged on the outside of the sliding rail (7); The top end of the rotating rod (12) close to one of the limiting seats (10) is fixedly provided with a limiting gear (13), one side of the limiting gear (13) is meshingly connected with a limiting rack (11), the limiting rack (11) is fixedly arranged on the bottom end of the outside of the sliding plate (8), and the outside of the bottom end of the rotating rod (12) is fixedly provided with a first worm wheel (14), one side of the first worm wheel (14) is meshingly connected with a first worm (15); The extrusion positioning assembly comprises four positioning blocks (28), the four positioning blocks (28) are equidistantly and fixedly arranged on the outer circumferential side of one end of the limiting rod (27) away from the piston block (29), each of the positioning blocks (28) is L-shaped, and the side view of the four positioning blocks (28) is cross-shaped; The outside of the side of the limiting rod (27) close to the opening end of the limiting cylinder (26) is fixedly provided with a positioning disc (30), and the limiting rod (27) is slidingly connected with the positioning disc (30), the positioning disc (30) is fixedly arranged on the outside of the opening end of the limiting cylinder (26), the outside of the limiting rod (27) is sleeved with a compression spring (36), and both ends of the compression spring (36) are fixedly arranged on the outside of one side of the positioning disc (30) and the outside of one side of the piston block (29).

2. A modular 10 kV combined instrument transformer for metering according to claim 1, characterized in that: Both ends of the first worm (15) are rotatably installed with a first rotating seat (16), one end of the first rotating seat (16) is fixedly installed on the bottom wall of the junction box body (3), one end of the first worm (15) is fixedly installed with a rotating block (17), one end of the rotating block (17) is rotatably installed outside the junction box body (3).

3. A modular 10 kV combined instrument transformer for metering according to claim 1, characterized in that: The junction box body (3) is fixedly installed with a drive rack (18) on the top wall close to the junction box cover (6), the shaft (9) is fixedly penetrated with a chain wheel (19) outside one end close to the drive rack (18), the sliding plate (8) is rotatably installed with a drive rod (21) outside one end away from the drive rack (18), the drive rod (21) is also fixedly penetrated with a chain wheel (19) outside, the chain wheel (19) outside the drive rod (21) and the chain wheel (19) outside the shaft (9) are transmissionally connected with a chain (20), the drive rod (21) is fixedly penetrated with a second worm wheel (22) outside.

4. A modular metering 10 kV combined instrument transformer according to claim 3, characterized in that: The second worm wheel (22) is meshingly connected with a second worm (24) on one side, both ends of the second worm (24) are rotatably installed with a second rotating seat (23), one end of the second rotating seat (23) is fixedly installed outside one side of the sliding plate (8), one end of the second worm (24) close to the drive rack (18) is fixedly installed with a drive gear (25).

5. A modular 10 kV combined instrument transformer for metering according to claim 1 characterized in that: The limiting cylinder (26) is fixedly penetrated with a one-way liquid inlet valve pipe (31) inside one end close to the junction box cover (6), the junction box cover (6) is fixedly provided with a liquid storage box (32) outside one side away from the limiting cylinder (26), the top end of the liquid storage box (32) is threadedly installed with a liquid injection cover, the input end of the one-way liquid inlet valve pipe (31) is fixedly installed inside the bottom end of the liquid storage box (32), the limiting rod (27) and the piston block (29) are fixedly penetrated with a liquid guide channel (33) inside, one end of the limiting rod (27) close to the positioning block (28) is fixedly penetrated with a one-way valve (34) inside, and the one-way valve (34) is in communication with the liquid guide channel (33).

6. A modular metering 10 kV combined instrument transformer according to claim 5, characterized in that: The liquid guide channel (33) is in communication with one end of the liquid guide channel (33), the bottom end of the junction box body (3) is penetrated with a wire hole (37) in the middle, the wire hole (37) is slidably provided with a contact block (38) inside, one end of the contact block (38) is fixedly installed outside the bottom end of the junction box cover (6).

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