A lead wire leading-out structure

Abstract

The utility model discloses a kind of lead-out structures, including copper bar, copper bar end is connected in voltage equalizing cover, copper bar end head shaped into terminal in the voltage equalizing cover into;The end surface of voltage equalizing cover away from copper bar constitutes opening, grounding seat is provided on the inner wall surface of voltage equalizing cover in opening place;Grounding seat is connected with line one, terminal is connected with line two, line one, line two respectively from voltage equalizing cover opening end and be connected in the two ends of external transformer bushing;Copper bar outer surface, voltage equalizing cover outer surface are all laid with insulating layer;Lead-out is carried out using copper bar, effectively enhance structural resistance to damage, in combination with the setting of end voltage equalizing cover, effectively simplify connection operation, and can be adapted to different capacity converter transformer, different voltage grade product use, effectively guarantee conductive performance, guarantee the reliability of operation.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a lead wire lead-out structure. Background Technology

[0002] For transformer equipment, its lead-out structure is one of the key technologies to ensure reliable transformer operation. With the increase in transformer voltage level and capacity, higher requirements and demands are placed on the electrical performance, mechanical strength, and insulation performance of the lead-out structure.

[0003] Existing transformer lead-out structures have some limitations and shortcomings. For example, in high-voltage transformers, current leads use copper cables connected via terminals, with bolts used to secure the cables to the terminals. This connection method is prone to cable deformation, has poor mechanical strength and conductivity, and requires additional external insulation for shielding after connection, making the process cumbersome and increasing working time and labor intensity. Furthermore, the actual insulation performance still needs improvement and optimization to ensure the electrical safety of the transformer during operation. Utility Model Content

[0004] To address the aforementioned issues, this application provides a reasonably structured lead-out structure, which effectively enhances structural resistance to damage, simplifies connection operations, and is adaptable to the use of converter transformers of different capacities and products of different voltage levels, effectively ensuring conductivity and operational reliability.

[0005] The technical solution adopted in this utility model is as follows: A lead wire lead structure includes a copper rod, the end of which is connected to an equalizing shield, and the end of the copper rod extending into the equalizing shield is formed into a terminal block; the end face of the equalizing shield away from the copper rod forms an opening, and a grounding seat is provided on the inner wall of the equalizing shield at the opening; a connecting wire one is connected to the grounding seat, and a connecting wire two is connected to the terminal block, with connecting wire one and connecting wire two extending from the opening end of the equalizing shield and respectively connected to the two ends of an external transformer bushing; an insulating layer is provided on the outer surface of the copper rod and the outer surface of the equalizing shield.

[0006] As a further improvement to the above technical solution: The terminal block is a sheet-like structure formed on the end of a copper rod, and the terminal block has holes for easy connection of the connecting wires.

[0007] The outer surface of the terminal block is plated with a 5μm-10μm silver plating layer.

[0008] The copper rod is cold-bent in the middle to form a curved structure. The bending angle of the curved structure is 30°-150° and the bending radius is not less than 3 times the diameter of the copper rod.

[0009] The equalizing shield is a cylindrical structure with one end open and the other end closed. A through hole adapted to the size of the copper rod is opened in the middle of the closed end. The terminal of the copper rod extends into the interior of the equalizing shield through the through hole. The copper rod located at the through hole and the equalizing shield are welded to form a completely connected sealed structure.

[0010] The equalizing shield is made of copper, and the inner diameter of the opening end of the equalizing shield is 2mm-3mm larger than the diameter of the copper rod.

[0011] The opening end of the equalizing cover is fitted with an equalizing ring, and the edge of the insulating layer at the opening of the equalizing cover extends inward along the equalizing ring to form a flange.

[0012] The insulating layer on the outer surface of the copper rod constitutes insulating layer one, which is made of insulating crepe paper and has a single-sided thickness of 15mm-25mm. The insulating layer on the outer surface of the equalizing cover constitutes insulating layer two, which is formed by wet processing of sulfate pulp and has a single-sided thickness of 8mm-12mm. The outer surface of the connection between the copper rod and the equalizing cover is formed by wet processing of sulfate pulp to create a transition zone, which connects insulating layer one and insulating layer two.

[0013] The grounding base is made of copper and has a cylindrical structure. One end of the grounding base is welded to the inner wall of the equalizing cover, and the other end of the grounding base has a connection hole. One end of the connecting wire is connected to the connection hole of the grounding base via a cold-pressed terminal and a fastener.

[0014] The connecting wire one and connecting wire two are made of one or both of copper braided tape and cable, and the copper braided tape is wrapped with cloth tape.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This utility model uses copper rods for lead wires, which effectively enhances the structural resistance to damage. Combined with the end equalization cover, it effectively simplifies the connection operation and can be used with converter transformers of different capacities and products of different voltage levels, effectively ensuring conductivity and ensuring operational reliability. This utility model also has the following advantages: The integrated molding of the terminal block at the end of the copper rod effectively increases the conductive area by approximately 30-50% compared to the traditional crimping structure, and effectively reduces localized heat points; at the same time, the terminal block is silver-plated to effectively reduce contact resistance. The grounding base is built into the equalizing cover to dissipate the induced charge in the equalizing cover in real time, reduce or even avoid equipment abnormalities caused by charge accumulation, and effectively ensure the equalization effect. The copper rod and the outer surface of the equalizing cover are respectively equipped with insulation layers using appropriate processes, and sulfate pulp is used for transition at the joint to effectively ensure and improve the reliability and adhesion of the insulation layer, thus guaranteeing the insulation performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 For the present utility model from Figure 1 A schematic diagram of the structure as seen from the perspective of point A in the middle.

[0018] Figure 3 For the present utility model from Figure 1 A structural diagram viewed from the perspective of B in the middle.

[0019] Figure 4 for Figure 1 A magnified view of a section at point C.

[0020] Among them: 1. Copper rod; 2. Insulation layer; 3. Equalizing cover; 4. Grounding base; 5. Equalizing ring; 6. Terminal block; 7. Connecting wire one; 8. Connecting wire two; 9. Transformer bushing; 21. Insulation layer one; 22. Insulation layer two; 23. Flanged edge; 41. Connecting hole. Detailed Implementation

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, a lead wire lead-out structure in this embodiment includes a copper rod 1, the end of which is connected to an equalizing cover 3. The end of the copper rod 1 extending into the equalizing cover 3 is formed into a terminal 6. The end face of the equalizing cover 3 away from the copper rod 1 forms an opening, and a grounding seat 4 is provided on the inner wall surface of the equalizing cover 3 at the opening. A connecting wire 7 is connected to the grounding seat 4, and a connecting wire 8 is connected to the terminal 6. The connecting wire 7 and the connecting wire 8 extend from the opening end of the equalizing cover 3 and are respectively connected to the two ends of the external transformer bushing 9. An insulating layer 2 is provided on the outer surface of the copper rod 1 and the outer surface of the equalizing cover 3.

[0023] In this embodiment, copper rod 1 is used for lead wires, which effectively enhances the structural resistance to damage. Combined with the end equalization cover 3, the connection operation is effectively simplified, and it can be adapted to the use of converter transformers of different capacities and products of different voltage levels.

[0024] In this embodiment, the grounding base 4 is built inside the equalizing cover 3 to dissipate the induced charge inside the equalizing cover 3 in real time, reduce or even avoid equipment malfunctions caused by charge accumulation, and effectively ensure the equalization effect.

[0025] In this embodiment, the connecting line 7 between the grounding base 4 and the transformer bushing 9 is essentially a fixed equipotential line, and the connecting line 8 between the terminal block 6 and the transformer bushing 9 is a current-carrying line.

[0026] like Figure 2 As shown, the terminal 6 is a sheet-like structure formed on the end of the copper rod 1, and the terminal 6 has a hole for easy connection of the connecting wire 8.

[0027] In this embodiment, the copper rod 1 can be made of T2Y hard copper, and the terminal 6 with an integrated structure can be formed at the end by CNC cutting. Of course, in other embodiments, other grades of copper can be used, and other forming methods can be used to form the terminal 6 with an integrated structure at the end of the copper rod 1.

[0028] In this embodiment, the terminal 6 is a sheet-like structure formed by cutting the end of the copper rod 1, which facilitates connection while increasing and ensuring the conductive area.

[0029] The outer surface of terminal 6 is plated with a 5μm-10μm silver plating layer.

[0030] In this embodiment, the terminal 6 is integrally formed at the end of the copper rod 1, which can effectively increase the conductive area by about 30-50% compared with the traditional crimp structure, and effectively reduce local heat points; at the same time, the terminal 6 is silver-plated to effectively reduce the contact resistance.

[0031] The copper rod 1 is cold-bent in the middle to form a curved structure. The bending angle of the curved structure is 30°-150° and the bending radius is not less than 3 times the diameter of the copper rod 1.

[0032] In this embodiment, the copper rod 1 can be bent into a preset shape and angle that is easy to assemble according to the actual internal assembly space requirements of the converter transformer by using a cold bending forming process. It is highly flexible and adaptable to the actual assembly space.

[0033] In this embodiment, the lead wire lead-out structure uses a copper rod 1, which can withstand slight vibrations during the operation of the converter transformer, effectively avoiding the risk of leakage caused by insulation cracking at traditional bends.

[0034] In this embodiment, the outer surface of the curved structure is polished to make the surface roughness Ra≤0.8μm, thereby reducing or even avoiding structural damage caused by bending stress.

[0035] like Figure 1 and Figure 2 As shown, the equalizing cover 3 is a cylindrical structure with one end open and the other end closed. A through hole adapted to the size of the copper rod 1 is provided in the middle of the closed end. The terminal 6 at the end of the copper rod 1 extends into the interior of the equalizing cover 3 through the through hole, so that the terminal 6 is completely located inside the equalizing cover 3. The copper rod 1 located at the through hole and the equalizing cover 3 are welded to form a completely connected sealed structure.

[0036] In this embodiment, the contact area between the copper rod 1 and the pressure equalization cover 3 can be sealed by argon arc welding. After welding, the connection is guaranteed to be free of pores and cracks in the post-weld flaw detection. The weld width can be set according to the actual connection requirements, such as 3mm-5mm.

[0037] In this embodiment, the connection between the copper rod 1 and the equalizing cover 3 is sealed by welding, which can reduce the electric field distortion rate by 60%-70% and effectively avoid insulation aging caused by local overheating or discharge.

[0038] The equalizing shield 3 is made of copper. The inner diameter of the opening end of the equalizing shield 3 is 2mm-3mm larger than the diameter of the copper rod 1, which effectively ensures the equalization of voltage and ensures the reliability of the structure.

[0039] In this embodiment, the equalizing cover 3 can be made of the same T2Y hard state copper material as the copper rod 1. Of course, other copper materials can also be used.

[0040] An equalizing ring 5 is welded to the open end of the equalizing cover 3. The edge of the insulating layer 2 located at the opening of the equalizing cover 3 extends inward along the equalizing ring 5 to form a flange 23. Figure 4 As shown.

[0041] In this embodiment, the equalizing ring 5 at the opening end of the equalizing cover 3 is set to effectively maintain the roundness of the opening of the equalizing cover 3 and ensure the reliability of the structure.

[0042] The insulating layer 2 located on the outer surface of the copper rod 1 constitutes insulating layer 21. Insulating layer 21 is made of insulating crepe paper and has a single-sided thickness of 15mm-25mm. In one embodiment, 20mm can be selected. The insulating layer 2 located on the outer surface of the equalizing cover 3 constitutes insulating layer 22. Insulating layer 22 is formed by wet processing of sulfate pulp and the pulp has a single-sided thickness of 8mm-12mm. In one embodiment, 10mm can be selected. The outer surface of the connection between the copper rod 1 and the equalizing cover 3 is formed by wet processing of sulfate pulp to form a transition zone, which connects insulating layer 21 and insulating layer 22.

[0043] In this embodiment, the outer surfaces of the copper rod 1 and the equalizing cover 3 are respectively equipped with insulating layers using appropriate processes, and sulfate pulp is used for transition at the joint, which effectively ensures and improves the reliability and adhesion of the insulating layers and guarantees the insulation performance.

[0044] In this embodiment, the insulation performance is effectively enhanced and guaranteed by the arrangement of the copper rod 1 and the insulation layer 2 on the outer surface of the equalizing cover 3. This can reduce the squeezing damage to the insulation layer 2 during assembly or transportation and extend the insulation life by 2-3 times.

[0045] Grounding socket 4 is made of copper, such as Figure 3As shown, the grounding base 4 has a cylindrical structure. One end of the grounding base 4 is welded to the inner wall of the equalizing cover 3, and the other end of the grounding base 4 has a connection hole 41. The end of the connecting wire 7 is connected to the connection hole 41 of the grounding base 4 by fasteners through a cold-pressed terminal.

[0046] In this embodiment, the grounding base 4 can be made of the same T2Y hard copper material as the copper rod 1 and the equalizing cover 3. Of course, other copper materials can also be used.

[0047] Connector 7 and connector 8 use one or both of copper braided tape and cable, with the copper braided tape wrapped with cloth tape.

[0048] In this embodiment, the copper braided strip can be wrapped with four layers of white cloth strip in a half-overlapping manner to protect the copper braided strip, reduce or even avoid wear and corrosion of the copper wires, and ensure connection performance.

[0049] In this embodiment, both connecting wire 7 and connecting wire 8 can be made of cable, or both can be made of copper braided tape. Alternatively, one can be made of cable and the other of copper braided tape.

[0050] In this embodiment, in actual use, the diameter of the copper rod 1, the thickness of the insulation layer 2, and the size of the voltage equalization cover 3 can be adjusted to adapt to products of different voltage levels, thereby achieving full coverage of different voltage levels.

[0051] The lead-out structure of this utility model effectively enhances the structural resistance to damage, simplifies the connection operation, and can be adapted to the use of converter transformers of different capacities and products of different voltage levels, effectively ensuring conductivity and guaranteeing operational reliability.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A lead wire lead-out structure, characterized in that: The device includes a copper rod (1), the end of which is connected to the equalizing cover (3). The end of the copper rod (1) extending into the equalizing cover (3) is formed into a terminal block (6). The end face of the equalizing cover (3) away from the copper rod (1) forms an opening. A grounding seat (4) is provided on the inner wall of the equalizing cover (3) at the opening. A connecting wire 1 (7) is connected to the grounding seat (4), and a connecting wire 2 (8) is connected to the terminal block (6). The connecting wire 1 (7) and the connecting wire 2 (8) extend from the opening end of the equalizing cover (3) and are respectively connected to the two ends of the external transformer bushing (9). An insulating layer (2) is provided on the outer surface of the copper rod (1) and the outer surface of the equalizing cover (3).

2. The lead wire lead-out structure as described in claim 1, characterized in that: The terminal block (6) is a sheet-like structure formed on the end of the copper rod (1), and the terminal block (6) has a hole for easy connection of the connecting wire (8).

3. A lead wire exit structure as described in claim 1 or 2, characterized in that: The outer surface of the terminal block (6) is plated with a 5μm-10μm silver plating layer.

4. The lead wire lead-out structure as described in claim 1, characterized in that: The copper rod (1) is cold-bent in the middle to form a curved structure. The bending angle of the curved structure is 30°-150° and the bending radius is not less than 3 times the diameter of the copper rod (1).

5. The lead wire lead-out structure as described in claim 1, characterized in that: The equalizing cover (3) is a cylindrical structure with one end open and the other end closed. A through hole adapted to the size of the copper rod (1) is provided in the middle of the closed end. The terminal (6) at the end of the copper rod (1) extends into the interior of the equalizing cover (3) through the through hole. The copper rod (1) located at the through hole and the equalizing cover (3) are welded to form a completely connected sealed structure.

6. A lead wire exit structure as described in claim 1 or 5, characterized in that: The equalizing shield (3) is made of copper, and the inner diameter of the opening end of the equalizing shield (3) is 2mm-3mm larger than the diameter of the copper rod (1).

7. A lead wire exit structure as described in claim 1 or 5, characterized in that: The equalizing cover (3) is fitted with an equalizing ring (5) at the opening end. The edge of the insulating layer (2) at the opening of the equalizing cover (3) extends inward along the equalizing ring (5) to form a flange (23).

8. The lead wire exit structure as described in claim 1, characterized in that: The insulating layer (2) on the outer surface of the copper rod (1) constitutes the first insulating layer (21), which is made of insulating crepe paper and has a single-sided thickness of 15mm-25mm. The insulating layer (2) on the outer surface of the equalizing cover (3) constitutes the second insulating layer (22), which is formed by wet treatment of sulfate pulp and has a single-sided thickness of 8mm-12mm. The outer surface of the connection between the copper rod (1) and the equalizing cover (3) is formed by wet treatment of sulfate pulp to form a transition zone, which connects the first insulating layer (21) and the second insulating layer (22).

9. The lead wire exit structure as described in claim 1, characterized in that: The grounding base (4) is made of copper and has a cylindrical structure. One end of the grounding base (4) is welded to the inner wall of the equalizing cover (3), and the other end of the grounding base (4) is provided with a connection hole (41). The end of the connecting wire (7) is connected to the connection hole (41) of the grounding base (4) by fasteners through a cold-pressed terminal.

10. A lead wire exit structure as described in claim 1, characterized in that: The connecting wire one (7) and connecting wire two (8) are made of one or both of copper braided tape and cable, and the copper braided tape is wrapped with cloth tape.

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