High-voltage winding connecting structure of combined mutual inductor
By using rivets to connect voltage leads and current terminal blocks in the combined transformer, the problems of cumbersome drilling and tapping and the concentration of tip electric fields are solved, and the effect of simplifying production and preventing electric fields is achieved.
Patent Information
- Application Number
- CN202422227830.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-11
AI Technical Summary
The connection between the voltage leads and the current terminal board in existing combined transformers requires drilling and tapping, which leads to cumbersome operation and the edges and corners of the bolt heads are prone to cause the problem of concentrated tip electric field.
The connecting holes of the current terminal board are used as smooth surfaces. Use rivets to connect the circular bare ends of the voltage leads to avoid drilling and tapping, and fix the voltage leads and the current terminal board through the rivets.
The production process is simplified, production efficiency is improved, and the phenomenon of concentrated tip electric fields is avoided, and the connection is smoother and the fastening force is strong.
Smart Images
Figure CN223245380U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of combined mutual inductors, in particular to a high-voltage winding connection structure of a combined mutual inductor body. Background Art
[0002] In power systems, combination transformers (CTs), as power conversion devices, primarily convert high voltage to low voltage and high current to low current, enabling measurement, protection, and monitoring of high-voltage lines. Cast-type combination CTs integrate voltage and current transformers into one device, enabling simultaneous measurement, protection, and monitoring of both voltage and current on high-voltage lines. The CT's main structure, with an epoxy resin insulating matrix, consists of a primary current winding, a secondary current winding, a primary voltage winding, a secondary voltage winding, supports, a mounting plate, and terminal blocks.
[0003] A cast-type combined instrument transformer can simultaneously monitor the voltage and current signals of the three phases of the power line. The product contains at least two voltage bodies and two current bodies. The high-voltage ends of the voltage body and the current body have a common terminal, that is, the high-voltage lead of the voltage body is connected to the primary winding of the current.
[0004] The common method for connecting the high-voltage leads of the transformer to the primary current winding is to drill and tap holes at the base of the current terminal block, then crimp the high-voltage leads of the transformer to bare ends, which are then bolted to the screw holes at the base of the current terminal block. This method is cumbersome to drill and tap, and the sharp corners of the bolt heads can easily lead to electric field concentration at the tip during testing or operation of the combined transformer. Utility Model Content
[0005] In order to solve the technical problems in the prior art that when the high-voltage lead of the voltage body of the combination transformer is connected to the current terminal board, it is necessary to drill and tap the root of the current terminal board, and then fix the high-voltage lead with bolts, which is troublesome to drill and tap, and the sharp corners of the bolt head easily lead to the concentration of the electric field at the tip during the test or operation of the combination transformer, the utility model provides a high-voltage winding connection structure of the combination transformer body.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A high-voltage winding connection structure for a combined transformer body includes a current terminal block and a voltage lead. A connection hole is opened at the root of the current terminal block, and the inner surface of the connection hole is a smooth surface. The connection end of the voltage lead is connected to a circular bare terminal head. A rivet passes through the inner hole of the bare terminal head and is inserted into the connection hole to fix the circular bare terminal head and the current terminal block.
[0008] The above-mentioned structural solution requires only drilling, not tapping, during the current terminal block manufacturing process, simplifying operations and significantly improving current terminal block production efficiency. Riveting is also more convenient and faster than bolting. Furthermore, rivet fastening ensures a strong fastening force while creating a smoother connection, avoiding the sharp corners of the bolt head that can cause electric field concentration during combined transformer testing or operation.
[0009] As a preferred implementation of the high-voltage winding connection structure of a combined transformer body, the rivet is made of copper, aluminum or stainless steel.
[0010] As a preferred implementation of the high-voltage winding connection structure of a combined transformer body, the connection holes are opened at the corners of the bottom of the current terminal block.
[0011] The above structural solution is adopted for easy connection.
[0012] As a preferred implementation of the high-voltage winding connection structure of a combined transformer body, the connection terminal of the voltage lead is crimped to the bare terminal.
[0013] With the above structural solution, the connection between the voltage lead and the bare terminal is relatively tight.
[0014] As a preferred implementation of the high-voltage winding connection structure of a combined transformer body, the rivet is a blind rivet.
[0015] With the above structural solution, installation is relatively simple and convenient.
[0016] As a preferred implementation of the high-voltage winding connection structure of a combined transformer body, the bare terminal is made of copper, aluminum or stainless steel.
[0017] The beneficial effects of the utility model include:
[0018] The current terminal block manufacturing process requires only drilling, not tapping, making it simple and efficient, significantly improving production efficiency. Riveting is more convenient and quicker than bolting. Furthermore, rivet fastening ensures a secure hold while creating a smoother connection, avoiding the sharp corners of the bolt head that can cause electric field concentration during testing or operation of the combined transformer. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 This is a schematic diagram of the overall structure of a high-voltage winding connection structure of a combined mutual inductor body in a specific embodiment of the present utility model;
[0021] Figure 2 This is a schematic diagram of the installation of a high-voltage winding connection structure of a combined transformer body in a specific implementation manner of the present utility model.
[0022] List of parts and reference numerals:
[0023] 1. Current terminal block; 2. Drilling; 3. Riveting; 4. Bare terminals; 5. Voltage leads. DETAILED DESCRIPTION
[0024] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0025] Reference Figure 1-2 This embodiment proposes a high-voltage winding connection structure for a combined transformer body, including a current terminal block 1 and a voltage lead 5. A connection hole is opened at the corner of the root of the current terminal block 1, and the inner surface of the connection hole is a smooth surface. The connection end of the voltage lead 5 is crimped with the circular bare terminal 4, and the rivet 3 passes through the inner hole of the bare terminal 4 and is inserted into the connection hole to fix the circular bare terminal 4 and the current terminal block 1. The rivet 3 is a blind rivet, and the material of the rivet 3 is copper, aluminum or stainless steel, and the material of the bare terminal 4 is copper, aluminum or stainless steel.
[0026] The working principle of this embodiment is:
[0027] Drill a hole 2 at the corner of the root of the current terminal block 1 to form a connecting hole without tapping. Crimpe the bare terminal 4 at the terminal end of the voltage lead 5. When assembling the mold, use a rivet 3 to pass through the inner control of the bare terminal 4 and insert it into the connecting hole to fix the bare terminal 4 and the current terminal block 1. Then, the voltage lead 5 of the voltage device body can be connected to the current primary winding.
[0028] In this embodiment, the current terminal block 1 manufacturing process only requires drilling holes 2, eliminating the need for tapping. This streamlined operation significantly improves the production efficiency of the current terminal block 1. The use of rivets 3 for connection is more convenient and faster than bolt fastening. Furthermore, the use of rivets 3 for fastening ensures a secure fastening force while creating a smoother connection, thus avoiding the sharp corners of the bolt heads that can cause electric field concentration during testing or operation of the combined transformer when using bolt fastening.
[0029] The annular bare terminal 4 in this embodiment is a common cold-pressed terminal.
[0030] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A high-voltage winding connection structure for a combined transformer body, comprising a current terminal block (1) and a voltage lead (5), characterized in that: A connection hole is formed at the root of the current terminal block (1), the inner surface of the connection hole being a smooth surface, the connection end of the voltage lead (5) is connected to the annular bare terminal (4), and the rivet (3) is inserted into the connection hole after passing through the inner hole of the bare terminal (4), thereby fixing the annular bare terminal (4) and the current terminal block (1).
2. A combined transformer body high voltage winding connection structure according to claim 1, characterized in that: The material of the rivet (3) is copper, aluminum or stainless steel.
3. The high-voltage winding connection structure of a combined mutual inductor according to claim 1, characterized in that: The connection holes are opened at the corners of the bottom of the current connection plate (1).
4. The high-voltage winding connection structure of a combined mutual inductor body according to claim 1, characterized in that: The connection terminal of the voltage lead (5) is crimped to the bare terminal (4).
5. The high-voltage winding connection structure of a combined mutual inductor body according to claim 1, characterized in that: The rivet (3) is a blind rivet.
6. The high-voltage winding connection structure of a combined mutual inductor body according to claim 1, characterized in that: The material of the bare end (4) is copper, aluminum or stainless steel.