A current transformer outlet box structure

Abstract

The utility model provides a current transformer outlet box structure, including the base of installation on the busbar shell that is built -in current transformer and the box cover of installation on the base, the upper portion of base is provided with lower connecting component, the box cover adopts light weight transparent insulating material and is made and is provided with the upper connecting component that cooperates with lower connecting component in the lower portion of box cover, the box cover is formed after the butt joint of base and box cover forms the wiring cavity, the wiring board of fixed mounting between upper connecting component and lower connecting component is located in the wiring cavity and is arranged with sealing washer between wiring board and lower connecting component, the lateral wall of box cover is provided with mounting hole, the soft wire sheath pipe joint is installed in mounting hole, the terminal post of being used for connecting the connecting wire of current transformer is provided with on the wiring board, the connecting wire of current transformer is connected on the terminal post and then is protected after passing through soft wire sheath pipe joint and is exported to the outside of box cover, the application is applicable to the application in humid, high corrosion scene can reduce the maintenance frequency and prolongs the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of power equipment, and in particular to a current transformer outlet box structure. Background Technology

[0002] Current transformers are an important component of live equipment in phase bus systems. They mainly convert high current into low current signals through the principle of electromagnetic induction to achieve the three functions of measurement, protection, and electrical isolation, ensuring the safe and stable operation of the system. For the outgoing lines of current transformers, it is usually necessary to use outgoing boxes to achieve the purpose of isolation protection and ensure insulation performance. In the existing technology, conventional current transformer outgoing boxes are generally made of metal materials such as aluminum alloy or steel (including the box body and the cover plate installed on the box body). Although this structure can achieve the purpose of outgoing lines, it has the following main defects: (1) Outgoing boxes made of metal materials are relatively heavy and the cover plate is made of metal. (1) It is impossible to directly observe the internal condition. It is often necessary to disassemble the equipment to check the internal wiring, wire head or equalizing spring connection. The operation is complicated and may affect the safety of equipment operation. (2) The metal material needs to be insulated. Long-term use may lead to a decrease in insulation performance due to coating aging. The insulation performance is limited. (3) During the manufacturing process, the metal cover of the outlet box needs to go through many processes such as stamping, milling and surface treatment. The processing technology is complicated and the manufacturing cost is high. (4) In a humid or corrosive environment, the metal cover is easily corroded, which affects the sealing and service life of the outlet box and has poor corrosion resistance. (5) The overall structural design is relatively simple and the outlet method is unreasonable, which seriously affects the measurement accuracy. Utility Model Content

[0003] This application provides a current transformer outlet box structure, which is simple in structure, lightweight, has good insulation, a reasonable outlet method, and a visual effect. To achieve the above technical features, the purpose of this utility model is as follows: A current transformer outlet box structure includes a base mounted on a busbar housing containing a current transformer and a cover mounted on the base. A lower connecting assembly is provided on the upper part of the base. The cover is made of a lightweight, transparent, insulating material, and an upper connecting assembly that mates with the lower connecting assembly is provided on the lower part of the cover. The base and cover, when aligned, form the wiring cavity. A terminal block located within the wiring cavity is fixedly installed between the upper and lower connecting assemblies, and a sealing gasket is placed between the terminal block and the lower connecting assembly. A mounting hole is provided on the side wall of the cover, and a flexible wire sheath connector is installed within the mounting hole. The terminal block has terminals for connecting the current transformer's connecting wires. The current transformer's connecting wires are connected to the terminals and then protected by the flexible wire sheath connector before being output to the outside of the cover.

[0004] The terminal block is provided with wiring holes for mounting terminals, and the terminals are mounted on the terminal block through the wiring holes.

[0005] The terminal block is provided with epoxy sealant applied around each of the terminal holes.

[0006] The base is composed of four seat plates that form a rectangular cavity, and the lower connecting assembly is composed of four lower connecting plates with an L-shaped cross-section installed on the top edge of each seat plate and lower connecting holes provided on each lower connecting plate.

[0007] The box cover is a shell that is closed on all four sides and top and open at the bottom. The upper connecting assembly consists of four upper connecting plates with the same L-shaped cross-section installed on the bottom four edges of the box cover and upper connecting holes provided on each of the upper connecting plates. The upper connecting holes and lower connecting holes are in one-to-one correspondence and connecting bolts can be connected between the upper connecting holes and the lower connecting holes.

[0008] The sealing gasket is a neoprene rubber sealing gasket.

[0009] The base plate is welded and fixed to the outlet cavity of the busbar casing.

[0010] The connecting bolts are nylon bolts.

[0011] The lightweight, transparent insulating material is plexiglass.

[0012] The present invention has the following beneficial effects: 1. The device features a base with a lower connecting component and a cover with an upper connecting component made of lightweight, transparent insulating material. This design allows for comprehensive internal visibility through the transparent cover. The connection between the upper and lower connecting components facilitates easy installation and disassembly, making operation simple and convenient. The visual design allows maintenance personnel to assess the internal condition without disassembly, reducing maintenance time by over 70% and significantly improving operational efficiency. Furthermore, the natural insulation of acrylic glass eliminates the need for additional insulation treatment, removing the risk of leakage from the metal cover and enhancing insulation safety to ensure safe equipment operation. 2. By fixing a terminal block located in the wiring cavity between the upper and lower connecting components and placing a sealing gasket between the terminal block and the lower connecting component, and by providing mounting holes on the side wall of the box cover and installing a flexible wire sheath connector in the mounting holes, the design of the sealing gasket not only ensures a waterproof and dustproof rating of IP55, but also ensures the reliability of wiring through the terminal block. At the same time, the designed flexible wire sheath connector further improves the protection level. 3. The entire structure is ingeniously designed, making installation and disassembly very convenient. It is also easy to process and manufacture. At the same time, its weight is only 60% of that of a metal cover, making it easier to operate. In addition, the acrylic cover lasts longer in salt spray corrosion tests. It is suitable for harsh environments such as coastal areas, chemical plants, and high-altitude areas. Its corrosion resistance reduces the number of maintenance times per year, thus lowering maintenance costs. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the main structure of the current transformer output box of this utility model in use. Figure 2 This is a side view of the current transformer output box structure of this utility model in use. Figure 3 This is a cross-sectional view of the current transformer output box structure of this utility model. Figure 4 This is a top view of the wiring board in this utility model. Figure 5 This is a top view of the base structure in this utility model; Figure 6 This is a top view of the box cover structure of this utility model; In the figure: 1. Current transformer, 2. Busbar housing, 3. Base, 4. Cover, 5. Wiring cavity, 6. Lower connection assembly, 7. Upper connection assembly, 8. Terminal block, 9. Sealing gasket, 10. Mounting hole, 11. Wire sheath connector, 12. Connecting wire, 13. Terminal post, 14. Wiring hole, 15. Seat plate, 16. Lower connection plate, 20. Upper connection plate, 21. Upper connection hole, 22. Connecting bolt, 23. Detailed Implementation

[0015] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0016] To achieve the above-mentioned technical features, the purpose of this utility model is as follows: See appendix Figure 1-6A current transformer outlet box structure includes a base 3 mounted on a busbar housing 2 housing a current transformer 1, and a cover 4 mounted on the base. A lower connecting component 6 is provided on the upper part of the base 3. The cover 4 is made of a lightweight, transparent insulating material, and an upper connecting component 7, which mates with the lower connecting component 6, is provided on the lower part of the cover 4. The base 3 and cover 4, when aligned, form a wiring cavity 5. A terminal block 8 is fixedly installed between the upper connecting component 7 and the lower connecting component 6, located within the wiring cavity. A sealing gasket 9 is placed between the terminal block 8 and the lower connecting component 6. The sealing gasket 9 is preferably a neoprene rubber gasket with a thickness of 5mm to ensure a waterproof and dustproof rating of IP55. A mounting hole 10 is provided on the side wall of the cover 4, and a flexible wire sheath connector 11 is installed within the mounting hole 10. The terminal block 8 has terminals 13 for connecting the current transformer's connecting wire 12. After being connected to terminal 13, the current transformer output is protected by flexible wire sheath connector 11 before being output to the outside of box cover 4. The above-mentioned current transformer output box structure has a simple overall design and a reasonable output method. The box cover 4 is made of lightweight transparent insulating material. The light transmittance of the plexiglass cover is ≥90%, and the thickness is 3-5mm. The light transmittance allows direct observation of the internal wiring and other components of the output box. Maintenance and inspection can be completed without disassembly, which significantly improves maintenance efficiency. In addition, the box cover made of plexiglass is naturally insulating and does not require additional insulation treatment, eliminating the risk of leakage from the metal cover from the root and enhancing insulation safety. At the same time, the box cover adopts a lightweight design, reducing the weight by 40% compared to aluminum. It can be easily held and positioned with one hand, reducing installation fatigue. After verification, this application is applicable to the installation of current transformers in phase bus systems, especially in humid and highly corrosive environments, which can reduce maintenance frequency and extend equipment service life.

[0017] In one embodiment, the terminal block 8 is provided with wiring holes 14 for mounting the terminal 13. The terminal 13 is mounted on the terminal block 8 through the wiring holes 14. The above structure has simple wiring and reliable connection.

[0018] In one embodiment, the terminal block 8 is provided with epoxy sealant coated around each terminal hole.

[0019] In one embodiment, the base 3 is composed of four seat plates 15 that form a rectangular cavity, and the lower connecting assembly 6 is composed of four lower connecting plates 16 with an L-shaped cross-section installed on the top edge of each seat plate 15 and lower connecting holes 20 provided on each lower connecting plate. Each lower connecting plate is installed on the top edge of each seat plate to form a flange connection structure, and the lower connecting plate 16 is fixedly connected to the seat plate 15 by adhesive bonding.

[0020] In one embodiment, the cover 4 is a shell that is closed on all sides and top and open at the bottom. The upper connecting assembly 7 consists of four upper connecting plates 21 with the same L-shaped cross-section installed on the bottom perimeter of the cover 4, and upper connecting holes 22 provided on each upper connecting plate. The upper connecting plates 21 are fixedly connected to the cover 4 by adhesive bonding. Each upper connecting plate 21 is installed on the bottom perimeter of the shell to form a flange connection structure. The upper connecting holes 22 and lower connecting holes 20 are in one-to-one correspondence and connecting bolts 23 can be connected between the upper connecting holes and the lower connecting holes. The positional accuracy error of the upper connecting holes 22 and lower connecting holes 20 is ≤ ±0.1mm. During installation, they are tightened in a diagonal sequence. After the base 3 and the cover 4 are joined together and connected by the flange structure, a wiring cavity 5 can be formed.

[0021] In one embodiment, the base plate 15 is welded and fixed to the outlet cavity of the busbar housing 2.

[0022] In one implementation, in this embodiment, the connecting bolt 23 is a nylon bolt to further block the leakage current path.

[0023] In one embodiment, the lightweight, transparent insulating material is plexiglass.

[0024] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A current transformer outlet box structure, comprising a base (3) mounted on a busbar housing (2) housing a current transformer (1) and a box cover (4) mounted on the base, characterized in that: The base (3) is provided with a lower connecting component (6) on its upper part. The cover (4) is made of lightweight transparent insulating material and an upper connecting component (7) is provided on the lower part of the cover (4) to cooperate with the lower connecting component (6). The base (3) and the cover (4) are fitted together to form a wiring cavity (5). A wiring plate (8) located in the wiring cavity is fixedly installed between the upper connecting component (7) and the lower connecting component (6), and a sealing gasket (9) is placed between the wiring plate (8) and the lower connecting component (6). An installation hole (10) is provided on the side wall of the cover (4). A flexible wire sheath connector (11) is installed in the installation hole (10). A terminal (13) for connecting the connecting wire (12) of the current transformer is provided on the terminal (13). The connecting wire (12) of the current transformer is connected to the terminal (13) and then protected by the flexible wire sheath connector (11) before being output to the outside of the cover (4).

2. The current transformer outlet box structure according to claim 1, characterized in that: The terminal block (8) is provided with a wiring hole (14) for mounting a terminal post (13), and the terminal post (13) is mounted on the terminal block (8) through the wiring hole (14).

3. The current transformer outlet box structure according to claim 2, characterized in that: The terminal block (8) is provided with epoxy sealant coated around each of the terminal holes.

4. The current transformer outlet box structure according to any one of claims 1-3, characterized in that: The base (3) is composed of four seat plates (15) that form a rectangular cavity. The lower connecting assembly (6) is composed of four lower connecting plates (16) with an L-shaped cross-section installed on the top edge of each seat plate (15) and lower connecting holes (20) provided on each lower connecting plate (16).

5. The current transformer outlet box structure according to claim 4, characterized in that: The cover (4) is a shell that is closed on all sides and top and open at the bottom. The upper connecting assembly (7) consists of four upper connecting plates (21) with the same L-shaped cross-section installed on the bottom four edges of the cover (4) and upper connecting holes (22) provided on each of the upper connecting plates (21). The upper connecting holes (22) and the lower connecting holes (20) are in one-to-one correspondence and connecting bolts (23) can be connected between the upper connecting holes and the connecting holes.

6. The current transformer outlet box structure according to claim 5, characterized in that: The sealing gasket (9) is a neoprene rubber sealing gasket.

7. The current transformer outlet box structure according to claim 6, characterized in that: The seat plate (15) is welded and fixed to the outlet cavity of the busbar shell (2).

8. The current transformer outlet box structure according to claim 7, characterized in that: The connecting bolt (23) is a nylon bolt.

9. The current transformer outlet box structure according to claim 8, characterized in that: The lightweight, transparent insulating material is plexiglass.

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