High-precision metering voltage transformer and production inspection system and method thereof

Abstract

The present invention relates to the technical field of glass surface cleaning, and specifically to a high-precision metering voltage transformer and a production inspection system and method thereof. A plurality of grooves are evenly arranged on the upper surface of an elastic plate (with gaps retained between the grooves), forming a "serrated" contact surface. When the elastic plate clamps the copper core upward, the edges of the grooves slightly scratch the oxide layer or contaminants on the surface of the copper core, exposing a fresh metal surface and further reducing contact resistance. At the same time, the grooves reduce the contact area between the elastic plate and the copper core, but increase the pressure per unit area (under the same clamping force), making the metal contact surface microscopically tighter and reducing the risk of "false connection". The grooves can also accommodate scraped oxide debris or water vapor, preventing impurity accumulation from affecting conductivity. The elastic plate with grooves further improves the conductivity stability after long-term use through the triple effects of "scraping, pressurization, and impurity removal". The elastic plate is particularly suitable for humid or dusty environments (such as outdoor substations).

Description

Technical Field

[0001] The present invention relates to the technical field of glass surface cleaning, in particular to a high-precision metering voltage transformer and a production inspection system and method thereof. Background Art

[0002] A voltage transformer is a special transformer used for voltage conversion. Its main function is to convert high voltage into low voltage proportionally to facilitate the safe operation of measurement, protection, and control equipment in the power system. The voltage transformer plays a "bridge" role in the power system, achieving electrical isolation between high-voltage and low-voltage equipment while ensuring the accuracy of measurement and protection.

[0003] The working principle of a voltage transformer is similar to that of an ordinary transformer, based on the law of electromagnetic induction. It mainly consists of a primary winding, a secondary winding, and an iron core:

[0004] Primary winding: has many turns and is directly connected in parallel to the high voltage circuit being measured (such as 10kV and 110kV lines).

[0005] Secondary winding: has few turns and is connected to the voltage coil of measuring instruments (such as voltmeters, energy meters) and protective devices (such as relays).

[0006] The core functions of voltage transformers are: to achieve electrical isolation of high-voltage circuit measurement and protection equipment through voltage transformers, preventing high voltage from directly connecting to low-voltage equipment, ensuring the safety of personnel and equipment; and to proportionally reduce high voltage to low voltage, allowing low-voltage equipment (instruments, relays, etc.) to measure and operate safely, reducing equipment insulation requirements and costs.

[0007] The core of the voltage transformer is the winding inside it. The winding consists of a ring and a wire. The ring is mostly made of silicon steel sheets, and the wire is wound on the surface of the ring. The specific number of turns depends on the needs. At the same time, both ends of the wire need to be connected to the external terminals of the transformer.

[0008] However, in the prior art, if a transformer fails after being used for a long time, staff are required to inspect and repair it. During the inspection, staff need to remove the winding from the wiring terminal of the transformer, and insert the two ends of the winding into the interior of the wiring terminal after the inspection is completed. In this process, since the transformer is in use for a long time, the plug-in terminal inside the transformer is connected to the winding for a long time, which will cause the surface of the conductive sheet inside the plug-in terminal and the copper core surface of the winding to oxidize and corrode, resulting in a significant decrease in the conductive effect of the two, resulting in a decrease in the performance of the transformer.

[0009] In summary, in order to solve the technical problems raised in this article, the present invention proposes a high-precision metering voltage transformer and a production inspection system and method thereof. Summary of the Invention

[0010] The present invention provides a high-precision metering voltage transformer, which includes a housing, a wire plug terminal, a winding ring, and a winding terminal; wherein the wire plug terminal is located on one side of the housing, and the winding ring is arranged inside the housing; the number of the winding terminals is two and is arranged at the upper end of the housing; the winding terminal also includes:

[0011] The mounting post has an upper end located outside the upper end of the housing and a lower end located inside the housing; a threaded groove is provided through the middle of the mounting post, and a locking bolt is provided inside the threaded groove;

[0012] The rectangular block is arranged at the lower end of the mounting column and is located inside the housing. The interior of the rectangular block is hollow, and the threaded groove is connected to the middle of the rectangular block. A wire insertion port is opened at one end of the two rectangular blocks close to each other.

[0013] A conductive plate is slidably connected to the middle portion of the rectangular block, and an upper end of the conductive plate contacts a lower end of the locking bolt;

[0014] An extrusion plate is disposed inside the rectangular block and is located at a lower end of the conductive plate;

[0015] The middle part of the arc plate is fixed on the lower end of the conductive plate; two ends of the arc plate are provided with limiting grooves, and the arc plate is an elastic copper sheet.

[0016] As a preferred solution of the present application, a support block is provided inside the rectangular block, and the support block is rectangular; a U-shaped plate, one end of the U-shaped plate is connected to the end of the arc plate 1 away from the wire socket; so that the U-shaped plate and the arc plate 1 form an S-shaped plate as a whole; a notch is provided at the end where the U-shaped plate is connected to the arc plate 1, and the size of the notch is the same as the size of the limit groove 1, the lower end of the U-shaped plate contacts the upper end of the support block, and the horizontal height of the end of the U-shaped plate away from the arc plate 1 is lower than the level of the lower wall of the wire socket.

[0017] As a preferred solution of the present application, an elastic plate is fixedly connected to the upper side of one end of the U-shaped plate away from the arc-shaped plate 1, and the material of the elastic plate is the same as that of the U-shaped plate and the arc-shaped plate 1.

[0018] As a preferred solution of the present application, a plurality of grooves are evenly formed on the upper surface of the elastic plate, and there are gaps between the plurality of grooves.

[0019] As a preferred solution of the present application, the extrusion plate is slidably connected to the inner wall of the rectangular block, and an arc plate 2 is provided inside the rectangular block. The arc plate 2 is U-shaped, and the middle part of the arc plate 2 is fixed to the lower wall inside the rectangular block, and the arc plate 2 is located directly below the arc plate 1, and the two ends of the arc plate 2 are located between the two ends of the arc plate 1. The two ends of the extrusion plate are in contact with the arc-shaped inner side of the arc plate 2. When the extrusion plate moves downward, the two ends of the extrusion plate squeeze the inner side of the arc plate 2.

[0020] As a preferred solution of the present application, an arc-shaped support plate is provided at the inner lower end of the arc-shaped plate 2.

[0021] A production inspection system for high-precision metering voltage transformers; the inspection system is used to inspect the above-mentioned high-precision metering voltage transformers; it is characterized in that the inspection system includes a transformer volt-ampere characteristic tester.

[0022] The beneficial effects of the present invention are as follows:

[0023] Multiple grooves are evenly distributed on the upper surface of the elastic plate (with gaps between the grooves), forming a "serrated" contact surface. When the elastic plate clamps the copper core upward, the edges of the grooves will slightly scratch the oxide layer or contaminants on the surface of the copper core, exposing a fresh metal surface and further reducing the contact resistance. At the same time, the grooves reduce the contact area between the elastic plate and the copper core, but the pressure per unit area increases (under the same clamping force), making the metal contact surface microscopically tighter and reducing the risk of "false connection". The grooves can also accommodate scraped oxide debris or water vapor to prevent impurity accumulation from affecting conductivity. The elastic plate with grooves further improves the conductive stability after long-term use through the triple effects of "scraping-pressurization-impurity removal", making it particularly suitable for humid or dusty environments (such as outdoor substations). BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional diagram of the mutual inductor of the present invention;

[0025] Figure 2 This is a view of the internal structure of the mutual inductor in the present invention;

[0026] Figure 3 This is a structural view of the rectangular block and the mounting column in the present invention;

[0027] Figure 4 yes Figure 3 Front view in

[0028] Figure 5 This is a view of the internal structure of the rectangular block in the present invention;

[0029] Figure 6 This is a structural view of the curved plate 1, the U-shaped plate and the curved plate 2 in the present invention;

[0030] In the figure: housing 1, wire plug terminal 11, winding ring 12, winding terminal 2, mounting column 21, locking bolt 22, rectangular block 23, wire plug port 24, conductive plate 25, extrusion plate 26, arc plate 1 27, limiting groove 1 271, support block 231, U-shaped plate 232, elastic plate 233, groove 234, arc plate 235, arc support plate 236. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] Example 1:

[0033] like Figures 1 to 6 As shown; a high-precision metering voltage transformer, the voltage transformer includes a housing 1, a wire plug terminal 11, a winding ring 12 and a winding terminal 2; wherein the wire plug terminal 11 is located on one side of the housing 1, and the winding ring 12 is arranged inside the housing 1; the number of the winding terminal 2 is two, and is arranged at the upper end of the housing 1; the winding terminal 2 also includes:

[0034] The mounting post 21 has an upper end located outside the upper end of the housing 1 and a lower end located inside the housing 1. A threaded groove is formed through the middle of the mounting post 21, and a locking bolt 22 is provided inside the threaded groove.

[0035] The rectangular block 23 is provided at the lower end of the mounting post 21 and is located inside the housing 1. The interior of the rectangular block 23 is hollow, and the threaded groove is connected to the middle of the rectangular block 23. A wire insertion port 24 is provided at one end of the two rectangular blocks 23 that are close to each other.

[0036] A conductive plate 25 is slidably connected to the middle portion of the rectangular block 23 , with the upper end of the conductive plate 25 contacting the lower end of the locking bolt 22 ;

[0037] An extrusion plate 26 is disposed inside the rectangular block 23 and is located at the lower end of the conductive plate 25;

[0038] The arc-shaped plate 27 is fixed at the lower end of the conductive plate 25 in its middle; a limiting groove 271 is provided at both ends of the arc-shaped plate 27, and the arc-shaped plate 27 is an elastic copper sheet;

[0039] A support block 231 is provided inside the rectangular block 23. The support block 231 is rectangular. A U-shaped plate 232 is connected at one end to the end of the curved plate 27 away from the wire insertion port 24. The U-shaped plate 232 and the curved plate 27 form an S-shaped plate as a whole. A notch is provided at the end where the U-shaped plate 232 is connected to the curved plate 27. The size of the notch is the same as that of the limiting groove 271. The lower end of the U-shaped plate 232 contacts the upper end of the support block 231. The horizontal height of the end of the U-shaped plate 232 away from the curved plate 27 is lower than the level of the lower wall of the wire insertion port 24.

[0040] An elastic plate 233 is fixedly connected to the upper side of one end of the U-shaped plate 232 away from the arc-shaped plate 1 27. The material of the elastic plate 233 is the same as that of the U-shaped plate 232 and the arc-shaped plate 1 27.

[0041] The specific working principle is as follows;

[0042] When installing the elastic plate 233, first, the two ends of the winding wire on the ring 12 are passed through the wire insertion opening 24 on the rectangular block 23 and inserted into the interior of the rectangular block 23. When removing the wire, the two ends of the winding wire need to be kept in a parallel horizontal plane. Ensure that when the winding wire enters the rectangular block 23, the winding wire is above the extrusion plate 26, and at the same time, the winding wire passes through the limiting groove 1 271 of the arc plate 1 27 and the notch on the U-shaped plate 232.

[0043] The core components of the winding end 2 include a mounting column 21, a rectangular block 23, a conductive plate 25, an extrusion plate 26, an arc plate 27, a U-shaped plate 232, an elastic plate 233 and an auxiliary support structure (support block 231). The components cooperate to form a linkage mechanism of "bolt drive-elastic deformation-multiple clamping", which is as follows: the threaded groove in the middle of the mounting column 21 cooperates with the locking bolt 22. When the locking bolt 22 is tightened, the lower end of the locking bolt 22 pushes the conductive plate 25 to slide downward in the rectangular block 23; the arc plate 27 (elastic copper sheet) fixed at the lower end of the conductive plate 25 is pressurized accordingly, and as the arc plate 27 moves downward, the arc plate 27 squeezes the winding until the arc plate 27 pushes the winding into contact with the extrusion plate 26. As the arc plate 27 moves downward, the winding is squeezed by the arc plate 27 until the arc plate 27 pushes the winding into contact with the extrusion plate 26. When the cam 232 is in the closed position, the cam 232 is in the closed position, and the cam 232 is in the closed position, so that the cam 232 is in the closed position and the cam 232 is in the closed position. When the cam 232 is in the closed position, the cam 232 is in the closed position, and the cam 232 is in the closed position, so that the cam 232 is in the closed position and the cam 232 is in the closed position. When the cam 232 is in the closed position, the cam 232 is in the closed position, and the cam 232 is in the closed position, so that the cam 232 is in the closed position and the cam 232 is in the closed position. When the cam 232 is in the closed position, the cam 232 is in the closed position, and the cam 232 is in the closed position, so that the cam 232 is in the closed position and the cam 232 is in the closed position.

[0044] After the copper core of the winding is inserted through the socket 24, tighten the locking bolt 22, the conductive plate 25 moves downward, the curved plate 27 bends, the U-shaped plate 232 rotates, and the elastic plate 233 tilts upward. Finally, an elastic clamping force is formed between the inner side of the curved plate 27 and the upper surface of the elastic plate 233, tightly wrapping the copper core. This structure utilizes the deformation properties of the copper elastic material, allowing the clamping force to adaptively adjust with the bolt preload, ensuring close contact over a large area between the copper core and the conductive components (the curved plate 27, the U-shaped plate 232, and the elastic plate 233 are all made of highly conductive copper).

[0045] The beneficial effects are as follows;

[0046] 1) Anti-oxidation and low contact resistance: During the elastic bending process of the curved plate 27, the two ends of the curved plate 27 slide on the surface of the copper core. The edges of the limiting grooves 271 at both ends of the curved plate 27 will scrape the surface of the copper core, removing the surface oxide layer. In addition, the multiple contact points (the inner side of the curved plate 27 and the upper surface of the elastic plate 233) increase the conductive area, solving the problem of poor contact caused by oxidation in traditional plug terminals 11.

[0047] 2) Convenient assembly and disassembly: The copper core can be assembled and disassembled simply by loosening and tightening the locking bolts 22, without removing the windings. This greatly simplifies the maintenance process and reduces mechanical damage caused by repeated assembly and disassembly.

[0048] 3) Adaptive compatibility: elastic deformation can adapt to copper cores of different diameters (within a certain range), avoiding insufficient clamping force caused by differences in copper core thickness;

[0049] 4) Removing the Oxide Layer: As the elastic plate 233 lifts the copper core and moves upward, the elastic plate 233 and the U-shaped plate 232 undergo elastic deformation. Specifically, the U-shaped plate 232 gradually becomes straight, allowing the elastic plate 233 to slide on the lower end of the conductive plate 25. During this process, the copper core cannot slide, allowing the elastic plate 233 to slide on the surface of the copper core, removing the oxide layer on the surface of the copper core and improving the conductive effect.

[0050] Example 2:

[0051] like Figures 1 to 6 As shown; the upper surface of the elastic plate 233 is evenly provided with a plurality of grooves 234, and there are gaps between the plurality of grooves 234;

[0052] The specific working principle is as follows;

[0053] Based on the first embodiment, a plurality of grooves 234 are evenly formed on the upper surface of the elastic plate 233 (with gaps remaining between the grooves 234), forming a "serrated" contact surface. When the elastic plate 233 clamps the copper core upward, the edges of the grooves 234 slightly scratch the oxide layer or contaminants on the surface of the copper core, exposing a fresh metal surface and further reducing the contact resistance. At the same time, the grooves 234 reduce the contact area between the elastic plate 233 and the copper core, but increase the pressure per unit area (under the same clamping force), making the metal contact surface microscopically tighter and reducing the risk of "false connection". In addition, the grooves 234 can accommodate scraped oxide debris or water vapor, preventing impurity accumulation from affecting conductivity.

[0054] Compared with the first embodiment, the elastic plate 233 with the groove 234 further improves the conductive stability after long-term use through the triple functions of "scraping-pressurizing-removing impurities", and is particularly suitable for humid or dusty environments (such as outdoor substations).

[0055] Example 3:

[0056] like Figures 1 to 6 As shown; the extrusion plate 26 is slidably connected to the inner wall of the rectangular block 23, and the interior of the rectangular block 23 is provided with an arc-shaped plate 235. The arc-shaped plate 235 is U-shaped, and the middle part of the arc-shaped plate 235 is fixed to the lower wall inside the rectangular block 23, and the arc-shaped plate 235 is located directly below the arc-shaped plate 1 27, and the two ends of the arc-shaped plate 235 are located between the two ends of the arc-shaped plate 1 27. The two ends of the arc-shaped plate 235 are provided with a limiting groove 2, and the two ends of the extrusion plate 26 are in contact with the arc-shaped inner side of the arc-shaped plate 235. When the extrusion plate 26 moves downward, the two ends of the extrusion plate 26 squeeze the inner side of the arc-shaped plate 235;

[0057] An arc-shaped support plate 236 is provided at the inner lower end of the second arc-shaped plate 235;

[0058] The specific work flow is as follows;

[0059] On the basis of the above-mentioned embodiment 1 and embodiment 2, an arc plate 235 (U-shaped elastic copper sheet) and an arc support plate 236 are additionally provided inside the rectangular block 23 to form a "bidirectional clamping" with the original structure; the middle part of the arc plate 235 is fixed to the lower wall of the rectangular block 23, and the two ends are located between the two ends of the arc plate 1 27; this embodiment makes the extrusion plate 26 and the cavity inside the rectangular block 23 be in sliding connection, and when the arc plate 1 27 moves downward, it squeezes the extrusion plate 26, and the extrusion plate 26 moves downward. During the process, the extrusion plate 26 squeezes the arc plate 235. Due to the interaction force and the continuous downward movement of the conductive plate 25, the arc plate 1 27, the arc plate 235 and the U-shaped plate 232 are deformed. When the extrusion plate 26 moves downward with the conductive plate 25, the two ends of the extrusion plate 26 squeeze the inner side of the arc plate 235, causing the two ends of the arc plate 235 to expand outward and align with the arc plate 235 above. The arc plate 1 27 forms a radial wrapping force on the copper core; at the same time, the arc support plate 236 is located at the lower end of the inner side of the arc plate 2 235, providing elastic support for the arc plate 2 235, ensuring that it can generate sufficient rebound force after deformation, avoiding elastic fatigue due to long-term use; the arc plate 1 27 and the elastic plate 233 provide clamping force in the up and down directions, and the newly added arc plate 2 235 provides clamping force in the left and right directions, forming a three-dimensional wrapping clamping, which is suitable for scenarios with larger diameters or requiring higher reliability, and in the process of deformation of the arc plate 2 235, the edges of the limit groove 2 at both ends of the arc plate 2 235 scrape the surface of the copper core to remove the oxide layer, and by increasing the radial clamping dimension, the risk of loosening of the copper core is further reduced, and stable contact can be maintained even in a vibration environment (such as when substation equipment is in operation), while dispersing the stress in a single direction and extending the service life of the conductive components.

[0060] Example 4:

[0061] High-precision metering voltage transformer production inspection system; the inspection system is used to inspect the above-mentioned high-precision metering voltage transformer; the inspection system includes a transformer volt-ampere characteristic tester;

[0062] The working principle is as follows;

[0063] The system verifies the electrical performance of the transformer in the above embodiment using a transformer volt-ampere characteristic tester, focusing on the following indicators:

[0064] Test whether the voltage conversion ratio of the primary winding and the secondary winding meets the design value (e.g., 10kV / 100V) and whether the angular error is within the allowable range (high-precision measurement requires ≤0.2%). By comparing the error data of the traditional plug-in terminal 11 and the structure of the present invention, verify the improvement of the clamping structure on measurement accuracy;

[0065] Simulate long-term use (accelerated aging through high and low temperature cycling and damp heat environment tests) and regularly measure the contact resistance of the plug-in terminal 11 (required to be ≤5mΩ). Due to the multiple clamping design, the resistance change rate of the structure of the present invention can be controlled within 10%, which is far superior to the traditional structure (more than 30%).

[0066] Test the insulation resistance between the winding and the housing 1, and between the primary and secondary sides (required to be ≥1000MΩ) to ensure that the metal parts of the clamping structure will not cause insulation breakdown due to improper installation.

[0067] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision metering voltage transformer, comprising a housing (1), a wire plug terminal (11), a winding ring (12), and a winding terminal (2); wherein the wire plug terminal (11) is located on one side of the housing (1), and the winding ring (12) is arranged inside the housing (1); the number of the winding terminals (2) is two, and the terminals are arranged at the upper end of the housing (1); and the characteristics are that: The winding end (2) also includes: The mounting column (21) has an upper end located outside the upper end of the housing (1) and a lower end located inside the housing (1); a threaded groove is provided through the middle of the mounting column (21), and a locking bolt (22) is provided inside the threaded groove; A rectangular block (23) is provided at the lower end of the mounting column (21) and is located inside the housing (1). The interior of the rectangular block (23) is hollow, and the threaded groove is connected to the middle of the rectangular block (23). A wire insertion port (24) is provided at one end of the two rectangular blocks (23) close to each other. A conductive plate (25) is slidably connected to the middle portion of the rectangular block (23), and the upper end of the conductive plate (25) contacts the lower end of the locking bolt (22); An extrusion plate (26) is disposed inside the rectangular block (23), and the extrusion plate (26) is located at the lower end of the conductive plate (25); The arc-shaped plate (27) is fixed at the lower end of the conductive plate (25); the two ends of the arc-shaped plate (27) are provided with a limiting groove (271), and the arc-shaped plate (27) is an elastic copper sheet; A support block (231) is provided inside the rectangular block (23), and the support block (231) is rectangular; a U-shaped plate (232), one end of the U-shaped plate (232) is connected to the end of the arc plate (27) away from the wire insertion port (24); so that the U-shaped plate (232) and the arc plate (27) form an S-shaped plate as a whole; a notch is provided at the end of the U-shaped plate (232) connected to the arc plate (27), and the size of the notch is the same as the size of the limiting groove (271); the lower end of the U-shaped plate (232) contacts the upper end of the support block (231), and the horizontal height of the end of the U-shaped plate (232) away from the arc plate (27) is lower than the level of the lower wall of the wire insertion port (24); An elastic plate (233) is fixedly connected to the upper side of one end of the U-shaped plate (232) away from the arc-shaped plate (27), and the material of the elastic plate (233) is the same as that of the U-shaped plate (232) and the arc-shaped plate (27); A plurality of grooves (234) are evenly formed on the upper surface of the elastic plate (233), and gaps are provided between the plurality of grooves (234).

2. The high-precision metering voltage transformer according to claim 1, characterized in that: The extrusion plate (26) is slidably connected to the inner wall of the rectangular block (23). The rectangular block (23) is provided with an arc plate 2 (235). The arc plate 2 (235) is U-shaped. The middle part of the arc plate 2 (235) is fixed to the lower wall of the rectangular block (23). The arc plate 2 (235) is located at the lower end of the arc plate 1 (27). The two ends of the arc plate 2 (235) are located between the two ends of the arc plate 1 (27). The two ends of the extrusion plate (26) are in contact with the arc inner side of the arc plate 2 (235). When the extrusion plate (26) moves downward, the two ends of the extrusion plate (26) squeeze the inner side of the arc plate 2 (235).

3. The high-precision metering voltage transformer according to claim 1, characterized in that: An arc-shaped support plate (236) is provided at the inner lower end of the second arc-shaped plate (235).

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