A current transformer secondary terminal block assembly and a current transformer

Abstract

This utility model relates to a secondary terminal block assembly for a current transformer and a current transformer, belonging to the field of electrical equipment. The technical solution is as follows: a secondary terminal block assembly for a current transformer includes a secondary terminal block body and a pressure ring. The pressure ring is parallel to the secondary terminal block body and abuts against one side of the secondary terminal block body. Multiple connection holes are respectively formed on the pressure ring and the secondary terminal block body, and connecting bolts are installed in the corresponding connection holes on the pressure ring and the secondary terminal block body. This solution adds a pressure ring to the bolted connection structure of the secondary terminal block body. The pressure ring overlaps with the secondary terminal block body, and the connecting bolts pass through both the pressure ring and the secondary terminal block, with the bolt heads pressing against the pressure ring. The pressure ring transmits the clamping force to the secondary terminal block body, greatly reducing stress concentration in the bolted connection, improving the sealing performance at the secondary terminal block, and preventing leakage of internal insulating gas.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment, and in particular to a current transformer secondary terminal block assembly and a current transformer. Background Technology

[0002] In modern power systems, gas-insulated electrical equipment is widely used due to its excellent insulation performance, compact structure, and high reliability. Secondary terminal blocks, as key components responsible for electrical connections in such equipment, safely and stably transition the internal leads to the external environment. This ensures that electrical signals from devices such as current transformers can be accurately transmitted to external control systems or monitoring equipment, guaranteeing the smooth signal transmission of the entire electrical system.

[0003] When secondary terminal blocks are used in clean air current transformers, they maintain good sealing performance under a rated air pressure of 0.4 MPa. However, with technological advancements, some equipment has increased its air pressure requirements. When the rated air pressure rises to 0.75 MPa, existing secondary terminal blocks cannot effectively seal, leading to frequent air leaks. This leakage problem seriously affects the operational safety of the product. Once the internal air pressure becomes unbalanced, it will damage the insulation performance of the equipment, thereby causing electrical faults and threatening the stable operation of the entire power system.

[0004] The secondary terminal block is mainly fixed by bolts. During equipment operation, factors such as mechanical vibration and temperature changes can easily cause stress concentration at the connection between the bolts and the secondary terminal block. When the internal insulating medium of the product is clean air with a pressure of 0.75 MPa, this stress concentration may further damage the sealing structure of the secondary terminal block, increasing the risk of air leakage. Summary of the Invention

[0005] This invention addresses the problem of stress concentration and reduced sealing performance when the secondary terminal block of a current transformer is fixed with bolts, by providing a current transformer secondary terminal block assembly with better sealing performance.

[0006] To solve the above problems, the technical solution adopted by this utility model is a secondary terminal block assembly for a current transformer, including a secondary terminal block body and a pressure ring. The pressure ring is parallel to the secondary terminal block body and abuts against one side of the secondary terminal block body. Multiple connection holes are respectively formed on the pressure ring and the secondary terminal block body, and connecting bolts are provided in the corresponding connection holes on the pressure ring and the secondary terminal block body. This solution adds a pressure ring to the bolted connection structure of the secondary terminal block body. The pressure ring overlaps with the secondary terminal block body, and the connecting bolts pass through both the pressure ring and the secondary terminal block, with the bolt heads pressing against the pressure ring. The pressure ring transmits the clamping force to the secondary terminal block body, greatly reducing the stress concentration of the bolted connection, improving the sealing performance at the secondary terminal block, and preventing leakage of internal insulating gas.

[0007] As a preferred embodiment of a current transformer secondary terminal block assembly, the connection holes are evenly distributed circumferentially on the pressure ring and the secondary terminal block body. This even distribution ensures that pressure is applied uniformly to the pressure ring and the secondary terminal block body when tightened with connecting bolts. This not only further improves sealing performance and effectively prevents leakage of internal insulating gas from the connection points, but also avoids structural deformation caused by excessive localized stress, significantly enhancing the stability and durability of the entire assembly.

[0008] In a preferred embodiment of a current transformer secondary terminal block assembly, the diameter of the pressure ring is larger than the diameter of the secondary terminal block body. A retaining ring is provided on the outer periphery of the side of the pressure ring facing the secondary terminal block body, and the retaining ring surrounds the outer periphery of the secondary terminal block body. This surrounding retaining ring effectively prevents the intrusion of dust, moisture, and other impurities, preventing damage to the internal circuit connections. It also provides a certain degree of restraint to the secondary terminal block body, making the entire assembly less prone to displacement during long-term use and ensuring the stable operation of the current transformer.

[0009] In a preferred embodiment of a current transformer secondary terminal block assembly, the thickness of the retaining ring is no greater than the thickness of the secondary terminal block body. This allows the secondary terminal block body to press firmly against the transformer, improving sealing performance.

[0010] As a preferred embodiment of a current transformer secondary terminal block assembly, the side of the secondary terminal block body facing away from the pressure ring is provided with a sealing ring receiving groove. The sealing ring receiving groove can accurately position and securely install the sealing ring, ensuring a tight fit between the sealing ring and the secondary terminal block body. This not only greatly enhances the sealing performance of the secondary terminal block, effectively preventing internal insulating gas leakage, but also resists corrosive substances in the external environment, extending the service life of the current transformer and reducing equipment maintenance costs.

[0011] As a preferred embodiment of a current transformer secondary terminal block assembly, the secondary terminal block body is provided with terminals, which are located in the inner hole of the pressure ring.

[0012] In a preferred embodiment of a current transformer secondary terminal block assembly, the end of the terminal block is higher than the outer end face of the pressure ring. This reduces positional interference during wiring.

[0013] On the other hand, this utility model also provides a current transformer, including a body on which the aforementioned current transformer secondary terminal block assembly is mounted, and the threaded end of the connecting bolt is connected to a bolt hole on the body. Applying this secondary terminal block assembly to a current transformer fully leverages its advantages such as reducing stress concentration and improving sealing, comprehensively enhancing the overall performance of the current transformer. This effectively ensures stable operation of the current transformer, reduces the probability of faults caused by terminal block issues, and provides strong support for the safe and reliable operation of the power system.

[0014] As a preferred implementation of a current transformer, a sealing ring is provided between the transformer body and the secondary terminal block. This improves its moisture-proof, dust-proof, and corrosion-proof properties, prevents gas leakage, and significantly extends the service life of the current transformer.

[0015] As can be seen from the above technical solutions, the advantages of this utility model are as follows: The current transformer secondary terminal block assembly of this solution, by adding a pressure ring parallel and close to the secondary terminal block body, allows the connecting bolts to pass through both simultaneously. This transmits the tightening force of the bolt heads to the secondary terminal block body via the pressure ring, effectively reducing stress concentration at the bolt connection and significantly improving the sealing performance at the secondary terminal block, thereby preventing leakage of internal insulating gas. The connecting holes are evenly distributed circumferentially on the pressure ring and the secondary terminal block body, ensuring uniform pressure application when the connecting bolts are tightened. This not only further enhances the sealing performance and prevents leakage of internal insulating gas from the connection point, but also avoids structural deformation caused by excessive local stress, greatly enhancing the stability and durability of the entire assembly. The diameter of the pressure ring is larger than the diameter of the secondary terminal block body, and a retaining ring is provided on the outer periphery of the side facing the secondary terminal block body. This retaining ring surrounds the outer periphery of the secondary terminal block body, effectively preventing the intrusion of dust, moisture, and other impurities, thus preventing damage to the internal circuit connections. It also provides a certain degree of restraint to the secondary terminal block body, ensuring that the entire assembly is not prone to displacement during long-term use, strongly guaranteeing the stable operation of the current transformer. The thickness of the retaining ring is no greater than the thickness of the secondary terminal block body, allowing the secondary terminal block body to better compress the transformer, further improving sealing performance. A sealing ring receiving groove is provided on the side of the secondary terminal block body facing away from the pressure ring, enabling precise positioning and secure installation of the sealing ring, ensuring a tight fit between the sealing ring and the secondary terminal block body. This not only greatly enhances the sealing performance of the secondary terminal block, effectively preventing internal insulating gas leakage, but also resists corrosive substances in the external environment, extending the service life of the current transformer and reducing equipment maintenance costs. The terminals on the secondary terminal block body are located in the inner hole of the pressure ring, with their ends higher than the outer end face of the pressure ring, reducing positional interference during wiring. Applying this secondary terminal block assembly to current transformers fully leverages its advantages, such as reducing stress concentration and improving sealing, comprehensively enhancing the overall performance of the current transformer. This effectively ensures stable operation of the current transformer, reduces the probability of faults caused by terminal block issues, and provides strong support for the safe and reliable operation of the power system. Furthermore, the sealing ring between the transformer body and the secondary terminal block enhances its moisture-proof, dust-proof, and corrosion-proof properties, prevents gas leakage, and significantly extends the service life of the current transformer. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0018] Explanation of main figure symbols

[0019] 1. Body, 2. Sealing ring, 3. Secondary terminal block body, 4. Pressure ring, 5. Connecting bolt, 6. Buckle, 7. Terminal block. Detailed Implementation

[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] Example 1

[0022] like Figure 1 As shown, a current transformer secondary terminal block assembly includes a secondary terminal block body 3 and a pressure ring 4. The plane of the pressure ring 4 is parallel to the plane of the secondary terminal block body 3, and the pressure ring 4 abuts against one side of the secondary terminal block body 3. Figure 1 In the middle, the upper end face of the secondary terminal block body 3 is the connection surface that connects to the transformer body, and the pressure ring 4 is located on the side of the secondary terminal block body 3 facing away from this connection surface, that is... Figure 1 As shown in the lower end face, further, the diameter of the pressure ring 4 is larger than the diameter of the secondary terminal block body 3. A retaining ring 6 is provided on the outer periphery of the side of the pressure ring 4 facing the secondary terminal block body 3, i.e., a radial area of ​​the pressure ring 4 larger than the secondary terminal block body 3. The retaining ring 6 surrounds the outer periphery of the secondary terminal block body 3, and a small clearance fit (generally 2-3 microns) is used between the inner diameter of the retaining ring 6 and the outer diameter of the secondary terminal block body 3. Multiple connecting holes are respectively provided on the pressure ring 4 and the secondary terminal block body 3. The connecting holes are evenly distributed circumferentially on the pressure ring 4 and the secondary terminal block body 3. Connecting bolts 5 are provided in the corresponding connecting holes on the pressure ring 4 and the secondary terminal block body 3. That is, the connecting holes on the pressure ring 4 are designated as first connecting holes, and the connecting holes on the secondary terminal block body 3 are designated as second connecting holes. The number of first and second connecting holes is the same, and the first and second connecting holes correspond one-to-one, arranged coaxially in groups. The connecting bolts 5 are installed in each group of first and second connecting holes. The secondary wiring board body 3 is provided with a wiring terminal 7, which is located in the inner hole of the pressure ring 4, and the end of the wiring terminal 7 is higher than the outer end face of the pressure ring 4.

[0023] Furthermore, the secondary connector body 3 is provided with a sealing ring receiving groove on the side facing away from the pressure ring 4. The cross-section of the sealing ring receiving groove is semi-circular. When the secondary connector body 3 is connected to the device body, a sealing ring is provided between the device body and the secondary connector body 3. The sealing ring is located in the sealing ring receiving groove and is pressed against the surface of the device body. Accordingly, the thickness of the retaining ring 6 is not greater than the thickness of the secondary connector body 3 to ensure that the tightening pressure of the bolt is fully applied to the secondary connector body 3 to press the sealing ring.

[0024] Example 2

[0025] like Figure 1 As shown, this embodiment further provides a current transformer, including a body 1, on which the secondary terminal block assembly of the current transformer provided in Embodiment 1 is installed. The end of the threaded bolt 5 is connected to the bolt hole on the body 1. A sealing ring 2 is provided between the body 1 and the secondary terminal block body 3, and the sealing ring 2 is located in the sealing ring receiving groove.

[0026] This design adds a parallel and tightly fitted pressure ring to the traditional bolted connection structure of the secondary terminal block. The connecting bolts pass through the pressure ring and the secondary terminal block body, evenly distributing the bolt head's clamping force to the secondary terminal block body through the pressure ring. This avoids stress concentration and significantly improves the sealing performance at the secondary terminal block. The connecting holes are evenly distributed circumferentially on both the pressure ring and the secondary terminal block body, further strengthening the sealing barrier and effectively preventing internal insulating gas from escaping from the connection point. It also avoids structural deformation caused by uneven local stress, greatly enhancing the stability and durability of the entire assembly. The pressure ring diameter is larger than the secondary terminal block body diameter, and a retaining ring is added to the outer periphery of the pressure ring facing the secondary terminal block body. This retaining ring tightly surrounds the secondary terminal block body, effectively blocking the intrusion of dust, moisture, and other impurities, providing comprehensive protection for the internal circuit connections, and also limiting the movement of the secondary terminal block body to ensure the assembly does not shift during long-term use. Furthermore, the design that the retaining ring thickness is no greater than the thickness of the secondary terminal block body allows the secondary terminal block body to more closely and securely clamp the transformer, further improving sealing performance.

[0027] The sealing ring receiving groove on the side of the secondary terminal block body facing away from the pressure ring precisely positions and securely installs the sealing ring, ensuring a tight fit between the sealing ring and the secondary terminal block body. This significantly enhances the sealing performance of the secondary terminal block, effectively preventing internal insulating gas leakage and resisting corrosive substances from the external environment. This significantly extends the service life of the current transformer and reduces equipment maintenance costs. The terminals on the secondary terminal block body are cleverly located within the inner hole of the pressure ring, with their ends protruding above the outer end face of the pressure ring. This design greatly facilitates wiring operations, effectively reduces positional interference during wiring, and improves work efficiency and wiring accuracy.

[0028] When this secondary terminal block assembly is applied to a current transformer, it can fully leverage its significant advantages in reducing stress concentration and improving sealing, thereby comprehensively enhancing the overall performance of the current transformer. This effectively ensures the stable operation of the current transformer under complex working conditions, significantly reduces the probability of failures caused by terminal block issues, and the sealing ring added between the transformer body and the secondary terminal block further improves its moisture-proof, dust-proof, and corrosion-proof properties, effectively preventing gas leakage and significantly extending the service life of the current transformer.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A current transformer secondary terminal block assembly comprising a secondary terminal block body (3), characterized in that, It also includes a pressure ring (4), which is parallel to the secondary wiring board body (3). The pressure ring (4) is attached to one side of the secondary wiring board body (3). Multiple connection holes are provided on the pressure ring (4) and the secondary wiring board body (3). Connection bolts (5) are provided in the corresponding connection holes on the pressure ring (4) and the secondary wiring board body (3).

2. The current transformer secondary terminal block assembly according to claim 1, characterized in that, The connecting holes are evenly distributed circumferentially on the pressure ring (4) and the secondary wiring board body (3).

3. The current transformer secondary terminal block assembly according to claim 1, characterized in that, The diameter of the pressure ring (4) is larger than the diameter of the secondary terminal block body (3). A buckle (6) is provided on the outer periphery of the side of the pressure ring (4) facing the secondary terminal block body (3). The buckle (6) surrounds the outer periphery of the secondary terminal block body (3).

4. The current transformer secondary terminal block assembly according to claim 3, characterized in that, The thickness of the buckle (6) is not greater than the thickness of the secondary wiring board body (3).

5. The current transformer secondary terminal block assembly according to claim 1, characterized in that, The secondary wiring board body (3) has a sealing ring receiving groove on the side facing away from the pressure ring (4).

6. The current transformer secondary terminal block assembly according to claim 1, characterized in that, The secondary wiring board body (3) is provided with wiring terminals (7), which are located in the inner hole of the pressure ring (4).

7. The current transformer secondary terminal block assembly according to claim 6, characterized in that, The end of the terminal (7) is higher than the outer end face of the pressure ring (4).

8. A current transformer, comprising a body (1), characterized in that, The current transformer secondary terminal block assembly as described in any one of claims 1-7 is installed on the transformer body (1), and the screw end of the connecting bolt (5) is connected to the bolt hole on the transformer body (1).

9. The current transformer according to claim 8, characterized in that, A sealing ring (2) is provided between the device body (1) and the secondary wiring board body (3).

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