A converter transformer clamping copper shield insulation structure

Abstract

This utility model belongs to the field of DC transmission equipment and relates to a copper shielding insulation structure for a converter transformer clamp. It includes an L-shaped copper plate and an L-shaped protective insulation plate. The upper L-shaped copper plate vertical plate and the upper L-shaped protective insulation plate vertical plate are installed on the outside of the upper clamp web. The upper L-shaped copper plate horizontal plate and the upper L-shaped protective insulation plate horizontal plate are installed below the upper clamp web. An upper insulation plate is disposed between the lower surface of the upper clamp web and the upper surface of the upper L-shaped copper plate horizontal plate. The lower L-shaped copper plate vertical plate and the lower L-shaped protective insulation plate vertical plate are installed on the outside of the lower clamp web. The lower L-shaped copper plate horizontal plate and the lower L-shaped protective insulation plate horizontal plate are installed above the lower clamp web. A lower insulation plate is disposed between the upper surface of the lower clamp web and the lower surface of the lower L-shaped copper plate horizontal plate. This utility model can significantly improve the insulation reliability and heat dissipation efficiency of the clamp copper shield, effectively solving the problems of localized overheating and insulation damage mentioned in the background art.

Description

Technical Field

[0001] This utility model belongs to the technical field of ultra-high voltage direct current transmission equipment, specifically relating to a copper shielding insulation structure for converter transformer clamps. Background Technology

[0002] As a core component of ultra-high voltage direct current (UHVDC) transmission systems, converter transformers generate alternating magnetic fields in their cores and windings during operation. These magnetic fields penetrate metal structural components such as clamps through leakage flux, leading to eddy current losses and localized overheating. To suppress these effects, the copper shielding of the clamps, with its high conductivity (≥58 MS / m), induces reverse eddy currents in the alternating magnetic field. This eddy current demagnetization effect reduces leakage flux density, thereby decreasing stray magnetic field strength and eddy current losses in the metal structural components.

[0003] Existing technologies have flaws in the design of copper shielding structures with clamps: In the design of the shielding copper plate, opening circular through-holes at locations where leakage magnetic fields are concentrated disrupts conductor continuity, forcing eddy currents to flow around the edge of the hole, causing magnetic field distortion, increasing eddy current losses in the copper shield, and posing a risk of localized heating. Simultaneously, traditional insulation solutions often use localized epoxy resin layers or laminated paperboard for incomplete insulation, which can lead to plastic deformation of the copper shield due to insufficient support during device compression, thereby compressing the insulation layer and posing a risk of localized electric field distortion and discharge.

[0004] Furthermore, the copper shield needs to form an electrical equipotential bond with the clamp web through an equipotential bonding system to eliminate potential differences between metal components. The current mainstream solution uses blackened bolts for direct tightening to achieve the equipotential bond between the copper shield and the clamp web. However, this design has several drawbacks: Firstly, combining the functions of the tightening bolt and the equipotential bonding bolt leads to material damage on the copper shield contact surface due to high stress concentration after tightening. With long-term operation, this damage accumulates, gradually increasing contact resistance and severely affecting the stability and reliability of the electrical connection. Secondly, under the complex vibration conditions of converter transformers, bolt torque gradually decreases over time. Under these long-term operating conditions, the grounding system faces a high risk of failure. Once such problems occur, a vicious cycle can form between mechanical loosening and electrical failure, mutually inducing each other, making subsequent maintenance and inspection extremely complex.

[0005] With the increasing demands for compactness and high reliability in UHVDC projects, traditional copper shielding designs can no longer meet the performance boundary conditions under the combined constraints of multiple physical fields (electromagnetic-thermal-mechanical). There is an urgent need for a systematic solution that integrates insulation enhancement, equipotential connection optimization, and innovative heat dissipation channels. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an optimized copper shielding insulation structure for converter transformer clamps. The technical solution adopted by this invention is as follows: A copper shielding insulation structure for a converter transformer clamp includes an upper clamp copper shielding insulation structure mounted on the web of an upper clamp and a lower clamp copper shielding insulation structure mounted on the web of a lower clamp. The upper clamp copper shielding insulation structure includes an upper L-shaped copper plate and an upper L-shaped protective insulation plate located outside the upper L-shaped copper plate. The vertical length of the upper L-shaped protective insulation plate is greater than the vertical length of the upper L-shaped copper plate. The vertical plates of the upper L-shaped copper plate and the upper L-shaped protective insulation plate are fixedly mounted on the outside of the web of the upper clamp. The horizontal plates of the upper L-shaped copper plate and the upper L-shaped protective insulation plate are also fixedly mounted on the web of the upper clamp. The plate is fixedly installed below the web of the upper clamping member. An upper insulating plate is provided between the lower surface of the web of the upper clamping member and the upper surface of the horizontal plate of the upper L-shaped copper plate. The copper shielding insulation structure of the lower clamping member includes a lower L-shaped copper plate and a lower L-shaped protective insulating plate located outside the lower L-shaped copper plate. The vertical plate of the lower L-shaped copper plate and the vertical plate of the lower L-shaped protective insulating plate are fixedly installed outside the web of the lower clamping member. The horizontal plate of the lower L-shaped copper plate and the horizontal plate of the lower L-shaped protective insulating plate are fixedly installed above the web of the lower clamping member. A lower insulating plate is provided between the upper surface of the web of the lower clamping member and the lower surface of the horizontal plate of the lower L-shaped copper plate.

[0007] Preferably, an upper mounting waist hole is provided on the vertical plate of the upper L-shaped copper plate, and a through hole corresponding to the upper mounting waist hole is provided on the vertical plate of the upper L-shaped protective insulating plate. An insulating screw is provided on the web plate of the upper clamping member at the position corresponding to the upper mounting waist hole and the through hole. The end of the insulating screw passes through the upper mounting waist hole and the through hole. An insulating washer is fitted on the insulating screw between the upper L-shaped copper plate and the web plate of the upper clamping member. An insulating washer is fitted on the insulating screw on the outside of the upper L-shaped protective insulating plate. An insulating nut is threadedly connected to the insulating screw on the outside of the insulating washer. A through hole is provided at the upper upper end of the vertical plate of the upper L-shaped protective insulating plate. An insulating screw is provided on the web plate of the upper clamping member at the position corresponding to the through hole. The end of the insulating screw passes through the through hole. Insulating nuts are threadedly connected to the insulating screws on both sides of the upper L-shaped protective insulating plate.

[0008] Preferably, a pin blind hole is formed on the upper horizontal surface of the upper L-shaped copper plate, and an upper pin is inserted into the pin blind hole with an interference fit. A round through hole corresponding to the upper pin is formed on the upper insulating plate.

[0009] Preferably, cross-shaped oil guide grooves are provided at the contact positions of insulating washer one and the upper L-shaped copper plate, and at the contact positions of insulating washer two and the upper L-shaped protective insulating plate. The outer end of insulating screw one is rounded, insulating nut is cut at one corner, and several oil channel grooves are evenly distributed on the front and back of the upper insulating plate.

[0010] Preferably, a lower mounting waist hole is opened on the vertical plate of the lower L-shaped copper plate, and a round through hole four corresponding to the lower mounting waist hole is opened on the vertical plate of the lower L-shaped protective insulating plate. An insulating screw is set on the web plate of the lower clamping member at the position corresponding to the lower mounting waist hole and the round through hole four. The end of the insulating screw passes through the lower mounting waist hole and the round through hole four. An insulating washer is fitted on the insulating screw one between the lower L-shaped copper plate and the web plate of the lower clamping member. An insulating washer two is fitted on the insulating screw one on the outside of the lower L-shaped protective insulating plate. An insulating nut one is threadedly connected to the insulating screw one on the outside of the insulating washer two.

[0011] Preferably, a second blind hole for a pin is opened on the upper surface of the web plate of the lower clamping member, and a second lower pin is inserted into the second blind hole with an interference fit. A fifth round hole corresponding to the second lower pin is opened on the lower insulating plate. A third blind hole for a pin is opened on the upper surface of the horizontal plate of the lower L-shaped copper plate. A sixth round hole corresponding to the third blind hole for a pin is opened on the lower L-shaped protective insulating plate, and a first lower pin is inserted into the third blind hole with an interference fit. A fourth blind hole for a pin is opened on the lower surface of the supporting insulating plate at the position corresponding to the first lower pin.

[0012] Preferably, several oil channel grooves are evenly distributed on the front and back of the lower insulation plate.

[0013] Preferably, a welding groove is opened at the upper part of the upper L-shaped copper plate, and a grounding wire is welded into the welding groove. The end of the grounding wire is cold-pressed to a terminal block. A welding groove is opened on the right side of the lower L-shaped copper plate, and a grounding wire is welded into the welding groove. The end of the grounding wire is cold-pressed to a terminal block.

[0014] Preferably, it also includes an equal-position locking assembly, which includes a flat washer, a disc spring, an equal-position bolt, and a pulp shielding cap. The ends of terminal one and terminal two are provided with through holes seven that mate with the equal-position bolt. The flat washer and the disc spring are fitted on the threaded rod between terminal one and terminal two and the nut of the equal-position bolt. The flat washer is located below the disc spring. The pulp shielding cap with an integrated cap structure is fastened on the top of the equal-position bolt.

[0015] Preferably, the equipotential bolts, disc springs, and flat washers are all made of blackened material.

[0016] The beneficial effects of this utility model are: By setting an upper L-shaped clamp copper shield insulation structure and a lower L-shaped clamp copper shield insulation structure at the web of the clamp, and setting an upper insulation plate and a lower insulation plate between the clamp web and the clamp copper shield insulation structure, this scheme aims to significantly improve the insulation reliability and heat dissipation efficiency of the clamp copper shield, effectively solve the problems of local overheating and insulation damage mentioned in the background technology, and is suitable for solving the electrical and mechanical stability problems of converter transformer cores under the coupling of electromagnetic-thermal-mechanical multi-physical fields. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are some specific embodiments of this utility model. For those skilled in the art, other drawings that fall within the scope of protection of this application can be obtained based on these drawings without creative effort. Figure 1 This is a cross-sectional view of the copper shielding insulation structure according to Embodiment 1 of this utility model. Figure 1 (a) is a cross-sectional view of the copper shielding insulation structure of the upper clamp. Figure 1 (b) is a cross-sectional view of the copper shielding insulation structure of the lower clamp; Figure 2 This is an overall layout diagram of the copper shielding insulation structure according to Embodiment 1 of this utility model. Figure 2 (a) is a diagram showing the layout of the copper shielding insulation structure of the upper clamp. Figure 2 (b) is a diagram showing the copper shielding insulation structure of the lower clamp; Figure 3 This is a front view of the upper L-shaped copper plate of Embodiment 1 of this utility model; Figure 4 This is a front view of the upper insulating plate of Embodiment 1 of this utility model; Figure 5 This is a front view of the lower L-shaped copper plate according to Embodiment 1 of this utility model; Figure 6 This is a cross-sectional view of the equipotential locking assembly of terminal block one in Embodiment 2 of this utility model; In the diagram, 1 is the upper clamping web plate, 2 is the upper insulating plate, 3 is the upper pin, 4 is the upper L-shaped copper plate, 5 is the upper L-shaped protective insulating plate, 6 is the first insulating washer, 7 is the second insulating washer, 8 is the first insulating screw, 9 is the first insulating nut, 10 is the second insulating screw, 11 is the second insulating nut, 12 is the lower clamping web plate, 13 is the lower L-shaped copper plate, 14 is the lower L-shaped protective insulating plate, 15 is the supporting insulating plate, 16 is the heat-resistant crepe paper, 17 is the first grounding wire, 18 is the first terminal block, 19 is the flat washer, 20 is the disc spring, 21 is the equipotential bolt, 22 is the paper pulp shielding cap, 23 is the first lower pin, 24 is the second lower pin, 25 is the lower insulating plate, 26 is the upper mounting waist hole, 27 is the second grounding wire, 28 is the second terminal block, 29 is the oil channel groove, 30 is the third round through hole, and 31 is the lower mounting waist hole. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0019] like Figure 1-5As shown, Embodiment 1 provides a copper shielding insulation structure for a converter transformer clamp, including an upper clamp copper shielding insulation structure fixedly installed on the upper clamp web 1 and a lower clamp copper shielding insulation structure fixedly installed on the lower clamp web 12.

[0020] The upper clamp copper shielding insulation structure includes an upper L-shaped copper plate 4 and an upper L-shaped protective insulation plate 5 located outside the upper L-shaped copper plate 4 (the upper L-shaped copper plate 4 and the upper L-shaped protective insulation plate 5 are stacked together, and a pad is placed on top of this position after the device body is assembled). The vertical length of the upper L-shaped protective insulation plate 5 is greater than the vertical length of the upper L-shaped copper plate 4. The vertical plates of the upper L-shaped copper plate 4 and the upper L-shaped protective insulation plate 5 are fixedly installed on the outside of the upper clamp web plate 1. Four horizontally penetrating upper mounting waist holes 26 are opened on the vertical plate of the upper L-shaped copper plate 4. A circular through hole corresponding to the upper mounting waist holes 26 is opened on the vertical plate of the upper L-shaped protective insulation plate 5. The inner diameter of the circular through hole is basically the same as the outer diameter of the insulating screw 8. A horizontally high-strength insulating screw 8 is fixedly installed on the upper clamp web plate 1 at the positions corresponding to the upper mounting waist holes 26 and the circular through hole 8. The upper clamp web plate 1 has a threaded hole, and the left end of the insulating screw 8 is machined with an external thread. The left end of the insulating screw 18 is threaded to the web plate 1 of the upper clamping member. The right end of the insulating screw 18 passes through the upper mounting hole 26 and the through hole 1. An insulating washer 6 is fitted on the insulating screw 18 between the upper L-shaped copper plate 4 and the web plate 1 of the upper clamping member. An insulating washer 7 is fitted on the insulating screw 18 outside the upper L-shaped protective insulating plate 5. An insulating nut 9 is threaded onto the insulating screw 18 outside the insulating washer 7. After tightening the insulating nut 9, the upper L-shaped copper plate 4 and the upper L-shaped protective insulating plate 5 are fixedly connected to the web plate 1 of the upper clamping member. The diameter of the insulating washer 16 is larger than the diameter of the insulating washer 7. Cross-shaped oil guide grooves are provided at the contact positions of the insulating washer 16 and the upper L-shaped copper plate 4, and at the contact positions of the insulating washer 27 and the upper L-shaped protective insulating plate 5. The cross-shaped oil guide grooves can prevent local overheating. The outer end of the insulating screw 18 is rounded, and the insulating nut 19 is chamfered, which can improve the electric field distribution and reduce partial discharge. A through hole 2 is opened on the vertical plate of the upper L-shaped protective insulating plate 5, which is higher than the upper L-shaped copper plate 4. A horizontal high-strength insulating screw 2 10 is fixed on the web plate 1 of the upper clamping part at the position corresponding to the through hole 2. The right end of the insulating screw 2 10 passes through the through hole 2 on the upper L-shaped protective insulating plate 5. Insulating nuts 2 11 are threadedly connected to the insulating screws 2 10 on both sides of the upper L-shaped protective insulating plate 5. A pair of insulating nuts 2 11 are used to fix the upper end of the vertical plate of the upper L-shaped protective insulating plate 5. The upper L-shaped protective insulating plate 5 is Nomex cardboard with a thickness of 2mm.The horizontal plates of the upper L-shaped copper plate 4 and the upper L-shaped protective insulating plate 5 are fixedly installed below the upper clamping web plate 1. Six vertical blind holes with a diameter of 10mm and a depth of 6mm are opened on the horizontal plate of the upper L-shaped copper plate 4. A high-strength upper pin 3 is inserted into each blind hole with an interference fit. The upper pin 3 is a round bar with a diameter of 10mm and made of epoxy glass cloth laminate EPGC203. Three upper pins 3 form a group. Each group of three upper pins 3 can fix an upper insulating plate 2 with an oil channel. The upper insulating plate 2 has a round through hole 30 corresponding to the upper pin 3. The upper end of the upper pin 3 is inserted into the round through hole 30 to fix the upper insulating plate 2. The two upper insulating plates 2 are arranged between the lower surface of the upper clamping web plate 1 and the upper surface of the horizontal plate of the upper L-shaped copper plate 4. By setting the upper insulating plates 2, the longitudinal insulation gap between the upper clamping web plate 1 and the upper L-shaped copper plate 4 can be filled.

[0021] The upper L-shaped copper plate 4 has a thickness of 10mm. A vertical welding groove (typical dimensions: 6mm deep x 10mm wide x 40mm long) is formed on the upper right side of the vertical plate of the upper L-shaped copper plate 4. Welding groove 1 is used to weld a separate grounding wire 17, which is a soft copper stranded wire (TJR-25). The soft copper stranded wire is flattened and spread out before being soldered with phosphor bronze, ensuring that the soft copper stranded wire is completely embedded in welding groove 1 and does not extend beyond the upper edge of the upper L-shaped copper plate 4. The end of grounding wire 17 is cold-pressed to a terminal block 18. Each side of the soft copper stranded wire is half-overlapped with heat-resistant crepe paper 16 with a thickness ≥2mm. The steel edge of terminal block 18 is also half-overlapped with heat-resistant crepe paper 16. The entire heat-resistant crepe paper 16 is coated with insulating varnish with a film thickness ≥35μm.

[0022] The upper insulating plate 2 is an EPGC203 epoxy glass cloth laminate with a thickness of 10mm. On the front and back of the upper insulating plate 2, semi-circular oil channels 29 with a radius of 2mm are cut every 10mm. Three evenly spaced circular through holes 30 with a diameter of 11mm are also cut into these channels. These through holes 30, together with upper pins 3, secure the upper insulating plate 2. This continuous small oil channel design effectively improves the heat dissipation performance of the upper L-shaped copper plate 4 under dense leakage magnetic field, ensuring the heat dissipation performance of the upper L-shaped copper plate 4 and guaranteeing the reliability of the insulation.

[0023] The lower clamp copper shielding insulation structure includes a lower L-shaped copper plate 13 and a lower L-shaped protective insulation plate 14 located outside the lower L-shaped copper plate 13. The vertical plates of the lower L-shaped copper plate 13 and the lower L-shaped protective insulation plate 14 are approximately the same length, but the vertical plate of the lower L-shaped protective insulation plate 14 is slightly longer than the vertical plate of the lower L-shaped copper plate 13. The lower L-shaped copper plate 13 is 10mm thick. The horizontal plate of the lower L-shaped copper plate 13 is installed above the lower clamp web plate 12, and the vertical plate of the lower L-shaped copper plate 13 is installed outside the lower clamp web plate 12. Four lower mounting holes 31 are evenly distributed on the vertical plate of the lower L-shaped copper plate 13. A circular through hole 4 corresponding to the lower mounting holes 31 is opened on the vertical plate of the lower L-shaped protective insulating plate 14. The inner diameter of the circular through hole 4 is the same as the outer diameter of the insulating screw 8. A horizontal high-strength insulating screw 8 is fixedly installed on the web plate 12 of the lower clamping member at the positions corresponding to the lower mounting holes 31 and the circular through hole 4. The lower L-shaped copper plate 13 and the lower L-shaped protective insulating plate 14 are fixedly connected to the web plate 12 of the lower clamping member by setting an insulating washer 6, an insulating washer 7 and an insulating nut 9 on the insulating screw 8. This installation structure is exactly the same as the installation structure of the upper L-shaped copper plate 4 and the upper L-shaped protective insulating plate 5. Six blind holes 2, each 10 mm in diameter and 6 mm deep, are evenly distributed on the upper surface of the web plate 12 of the lower clamping member. A high-strength lower pin 24 is inserted into each blind hole 2 with an interference fit. Three lower pins 24 form a group. Each group of three lower pins 24 can fix a lower insulating plate 25 with an oil channel. The lower insulating plate 25 has a through hole 5 corresponding to the lower pin 24. The upper end of the lower pin 24 is inserted into the through hole 5 to fix the lower insulating plate 25. The oil channel structure on the lower insulating plate 25 is the same as that on the upper insulating plate 2. Two lower insulating plates 25 are arranged between the upper surface of the lower clamping web plate 12 and the lower surface of the horizontal plate of the lower L-shaped copper plate 13. The lower insulating plates 25 can support the horizontal plate of the lower L-shaped copper plate 13. At the same time, the lower insulating plates 25 fill the insulating space between the short side of the lower clamping web plate 12 and the lower L-shaped copper plate 13. Moreover, its high strength characteristics ensure that the lower L-shaped copper plate 13 is not easily deformed when the device body is compressed, which greatly enhances the stress stability of the key area of ​​the copper shield. Four sets of blind holes 3, each 5 mm deep and 10 mm in diameter, are made on the horizontal surface of the lower L-shaped copper plate 13. A round through hole 6, corresponding to the blind holes 3, is made on the lower L-shaped protective insulating plate 14. A high-strength lower pin 1 23 is inserted into each blind hole 3 with an interference fit. The lower pin 1 23 passes through the round through hole 6. A blind hole 4, corresponding to the position of the lower pin 1 23, is made on the lower surface of the supporting insulating plate 15. The upper end of the lower pin 1 23 is inserted into the blind hole 4 to fix the supporting insulating plate 15. The supporting insulating plate 15 is used to fix the oil guide pad.

[0024] Similarly, a horizontal welding groove is opened on the right side of the lower L-shaped copper plate 13. A grounding wire 27 is welded inside the welding groove. The end of the grounding wire 27 is cold-pressed to a terminal 28. Each side of the grounding wire 27 is half-overlapped with heat-resistant crepe paper 16 with a thickness of ≥2mm. The steel edge of the terminal 28 is also half-overlapped with heat-resistant crepe paper 16. The heat-resistant crepe paper 16 is brushed with insulating varnish with a film thickness of ≥35μm.

[0025] Making longitudinal pin blind holes on the horizontal plates of the upper L-shaped copper plate 4 and the lower L-shaped copper plate 13 is of great significance for reducing the leakage flux of the converter transformer, improving the utilization efficiency of the magnetic field, and reducing energy loss.

[0026] During the compression process of the vessel body, a strong force will push the upper L-shaped copper plate 4 upwards and the lower L-shaped copper plate 13 downwards, causing the L-shaped copper plates to shift. The reserved gaps are to allow more space for this movement, which is also why the holes on the L-shaped copper plates are oblong. The nuts at this position are not tightened all at once; they are finally tightened after the vessel body has been dried with kerosene steam and compressed to the required position.

[0027] The magnetic flux leakage is mainly concentrated in the vertical direction. The impact of opening small holes in the horizontal direction is not significant, and the magnetic flux leakage is relatively small. Example 2

[0028] like Figure 6 As shown, an equipotential locking assembly for realizing the formation of an electrical equipotential body between the upper clamp copper shield insulation structure and the upper clamp web plate 1 in Embodiment 1 includes a flat washer 19, a disc spring 20, an equipotential bolt 21, and a paper pulp shield cap 22. The equipotential bolt 21 is an M8 equipotential bolt. An internal threaded hole for mounting the equipotential bolt 21 is formed on the web plate 1 of the upper clamping member. A through hole 7, which mates with the equipotential bolt 21, is formed at the end of the terminal 18. The lower end of the equipotential bolt 21 passes through the through hole 7 and is screwed into the internal threaded hole on the web plate 1 of the upper clamping member. A flat washer 19 and a disc spring 20 are fitted onto the threaded rod between the terminal 18 and the nut of the equipotential bolt 21. The flat washer 19 is located below the disc spring 20. A paper pulp shielding cap 22 with an integrated cap structure is fastened above the equipotential bolt 21, forming a gradient dielectric layer. The porous fiber structure of the paper pulp can absorb energy from areas of concentrated electric field, thus homogenizing the electric field intensity distribution and protecting the equipotential points. The equipotential bolt 21, disc spring 20, and flat washer 19 are all made of blackened material. The disc spring 20 provides a continuous and stable clamping force, compensating for the preload attenuation that may occur due to vibration and thermal cycling during operation, and maintaining stable contact resistance. The tightening torque at equal points is 50 N·m to ensure a reliable connection.

[0029] By setting up an equipotential locking component, the stability of the equipotential connection of the copper shield of the clamp is significantly improved, effectively solving the problems of equipotential difference and connection failure mentioned in the background art.

[0030] The clamp copper shield insulation structure and equipotential locking assembly of this utility model embodiment are applicable to converter transformer products with clamp copper shields in single-column and multi-column structures.

[0031] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. A copper shielding insulation structure for a converter transformer clamp, comprising an upper clamping copper shielding insulation structure mounted on the web of the upper clamping member and a lower clamping copper shielding insulation structure mounted on the web of the lower clamping member, characterized in that, The upper clamp copper shielding insulation structure includes an upper L-shaped copper plate and an upper L-shaped protective insulation plate located outside the upper L-shaped copper plate. The vertical length of the upper L-shaped protective insulation plate is greater than the vertical length of the upper L-shaped copper plate. The vertical plates of the upper L-shaped copper plate and the upper L-shaped protective insulation plate are fixedly installed on the outside of the upper clamp web. The horizontal plates of the upper L-shaped copper plate and the upper L-shaped protective insulation plate are fixedly installed below the upper clamp web. An upper insulation plate is provided between the lower surface of the upper clamp web and the upper surface of the horizontal plate of the upper L-shaped copper plate. The lower clamp copper shielding insulation structure includes a lower L-shaped copper plate and a lower L-shaped protective insulation plate located outside the lower L-shaped copper plate. The vertical plates of the lower L-shaped copper plate and the lower L-shaped protective insulation plate are fixedly installed on the outside of the lower clamp web. The horizontal plates of the lower L-shaped copper plate and the lower L-shaped protective insulation plate are fixedly installed above the lower clamp web. A lower insulation plate is provided between the upper surface of the lower clamp web and the lower surface of the horizontal plate of the lower L-shaped copper plate.

2. The copper shielding insulation structure for a converter transformer clamp according to claim 1, characterized in that, An upper mounting waist hole is opened on the vertical plate of the upper L-shaped copper plate. A round through hole corresponding to the upper mounting waist hole is opened on the vertical plate of the upper L-shaped protective insulating plate. An insulating screw is set on the web plate of the upper clamping member at the position corresponding to the upper mounting waist hole and the round through hole. The end of the insulating screw passes through the upper mounting waist hole and the round through hole. An insulating washer is fitted on the insulating screw between the upper L-shaped copper plate and the web plate of the upper clamping member. An insulating washer is fitted on the insulating screw on the outside of the upper L-shaped protective insulating plate. An insulating nut is threadedly connected to the insulating screw on the outside of the insulating washer. A round through hole is opened at the upper end of the vertical plate of the upper L-shaped protective insulating plate. An insulating screw is set on the web plate of the upper clamping member at the position corresponding to the round through hole. The end of the insulating screw passes through the round through hole. Insulating nuts are threadedly connected to the insulating screws on both sides of the upper L-shaped protective insulating plate.

3. A converter transformer tap piece copper shield insulation structure according to claim 2, characterized in that, A pin blind hole is made on the upper horizontal surface of the upper L-shaped copper plate. An upper pin is inserted into the pin blind hole with an interference fit. A round through hole corresponding to the upper pin is made on the upper insulating plate.

4. A converter transformer tap piece copper shield insulation structure according to claim 3, characterized in that, Cross-shaped oil guide grooves are provided at the contact positions of insulating washer one and the upper L-shaped copper plate, and at the contact positions of insulating washer two and the upper L-shaped protective insulating plate. The outer end of insulating screw one is rounded, the insulating nut is cut at one corner, and several oil channel grooves are provided on the front and back of the upper insulating plate.

5. A converter transformer tap changer copper shield insulation structure as claimed in claim 1, wherein, A lower mounting waist hole is opened on the vertical plate of the lower L-shaped copper plate. A four round through hole corresponding to the lower mounting waist hole is opened on the vertical plate of the lower L-shaped protective insulating plate. An insulating screw is set on the web plate of the lower clamping member at the position corresponding to the lower mounting waist hole and the four round through hole. The end of the insulating screw passes through the lower mounting waist hole and the four round through hole. An insulating washer is fitted on the insulating screw between the lower L-shaped copper plate and the web plate of the lower clamping member. An insulating washer is fitted on the insulating screw on the outside of the lower L-shaped protective insulating plate. An insulating nut is threadedly connected to the insulating screw on the outside of the insulating washer.

6. The copper shielding insulation structure for a converter transformer clamp according to claim 5, characterized in that, A second blind hole for a pin is made on the upper surface of the web plate of the lower clamping member. The second pin is inserted into the second blind hole with an interference fit. A fifth through hole corresponding to the second pin is made on the lower insulating plate. A third blind hole for a pin is made on the upper surface of the horizontal plate of the lower L-shaped copper plate. A sixth through hole corresponding to the third blind hole for a pin is made on the lower L-shaped protective insulating plate. The first pin is inserted into the third blind hole with an interference fit. A fourth blind hole for a pin is made on the lower surface of the supporting insulating plate at the position corresponding to the first pin.

7. The copper shielding insulation structure for a converter transformer clamp according to claim 6, characterized in that, Several oil channel grooves are evenly distributed on the front and back of the lower insulation plate.

8. The copper shielding insulation structure for a converter transformer clamp according to claim 1, characterized in that, A welding groove is opened on the upper part of the upper L-shaped copper plate. Grounding wire 1 is welded into welding groove 1, and the end of grounding wire 1 is cold-pressed to terminal 1. A welding groove 2 is opened on the right side of the lower L-shaped copper plate. Grounding wire 2 is welded into welding groove 2, and the end of grounding wire 2 is cold-pressed to terminal 2.

9. A converter transformer tap piece copper shield insulation structure according to claim 8, characterized in that, It also includes an equal-position locking assembly, which includes a flat washer, a disc spring, an equal-position bolt, and a pulp shielding cap. The ends of terminal one and terminal two are provided with through holes seven that mate with the equal-position bolt. The flat washer and the disc spring are fitted on the threaded rod between terminal one and terminal two and the nut of the equal-position bolt. The flat washer is located below the disc spring. The pulp shielding cap with an integrated cap structure is fastened on the top of the equal-position bolt.

10. A converter transformer tap piece copper shield insulation structure according to claim 9, characterized in that, The equipotential bolts, disc springs, and flat washers are all made of blackened material.

Images