A converter transformer anti-sinking grid-side outgoing line device

Abstract

This invention discloses an anti-sinking grid-side outgoing line device for a converter transformer. The outgoing line device is fixed inside the converter transformer, supporting the device to prevent sinking. The outgoing line device includes a first equalizing sphere, an upper shielding tube, and a second equalizing sphere, all sequentially fixedly connected. The upper shielding tube is equipped with a clamping assembly for fixed connection to a riser. A fixing flange, an insulating corner ring, and insulating gaskets are provided between the upper shielding tube and the lead wire shielding tube. The lead wire shielding tube is connected to the outgoing line device at the same potential via an equipotential connection. Fixing the outgoing line device with the lead wire shielding tube and clamping assembly prevents sinking, improving the stability and safety of the device. Insulating the outgoing line device from the lead wire shielding tube ensures its safety. Adjusting the number of insulating gaskets allows for adjustment of the distance between the upper shielding tube and the lead wire shielding tube, facilitating subsequent adjustments to the transformer outgoing line device.

Description

Technical Field

[0001] This invention belongs to the technical field of grid-side outgoing line devices for converter transformers, specifically relating to a grid-side outgoing line device for preventing subsidence of a converter transformer. Background Technology

[0002] Converter transformer outgoing line devices are divided into valve-side and grid-side types. The grid-side outgoing line device is an insulating device that connects the grid-side bushing of the converter transformer to the transformer winding. The grid-side outgoing line device of a converter transformer is generally installed in the riser on the grid side. This outgoing line device typically consists of an equalizing sphere, a shielding tube, and insulating clamps, etc., which can improve the surrounding electric field distribution, reduce the insulation distance, protect the leads between the transformer winding and the bushing, and ensure the safe operation of the leads in the electric field.

[0003] In existing technology, the lower shielding bushing electrode of the grid-side bushing is shielded by a voltage equalization ball supported by a shielding tube. The voltage equalization ball is generally covered with insulating crepe paper or pulp. Due to the limitations of transporting large transformers and the needs of on-site installation, a transition voltage equalization ball is used to shield the voltage equalization ball and shielding tube in the riser seat and the shielding tube inside the oil tank. This transition voltage equalization ball is fixed on the shielding tube inside the oil tank. In order to adjust the size of the bushing inserted into the voltage equalization ball, the part of the current grid-side outgoing device into which the transition voltage equalization ball is inserted is suspended. Because converter transformers vibrate significantly during long-term operation, the vibration can cause the shielding tube to sink along with the voltage equalization ball, resulting in discharge between the bushing and the riser seat wall, which may lead to some safety hazards. Summary of the Invention

[0004] This invention provides a device for preventing subsidence of the grid-side outgoing line of a converter transformer, which solves the problem of safety hazards caused by the discharge of the riser due to the subsidence of the shield tube in the current outgoing line device.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a grid-side outgoing line device for preventing sinking of a converter transformer, wherein the converter transformer includes a riser base, a bushing fixed on the riser base, a lead wire shielding tube fixed inside the converter transformer, and an outgoing line device fixed to the top of the lead wire shielding tube, wherein the lead wire shielding tube supports the outgoing line device to prevent it from sinking; the outgoing line device includes: a first equalizing ball, an upper shielding tube, and a second equalizing ball lead wire shielding tube fixedly connected from top to bottom; the upper shielding tube is provided with at least one clamping assembly fixedly connected to the inner wall of the riser base. The clamping assembly includes an insulating component surrounding the upper shielding tube and at least two clamping parts fixed to the inner wall of the riser. The insulating component and the upper shielding tube are clamped and fixed inside the riser by a plurality of clamping parts evenly distributed around the perimeter. The upper shielding tube and the lead wire shielding tube are connected and fixed inside the second equalizing ball. A fixing assembly is provided between the upper shielding tube and the lead wire shielding tube. The fixing assembly includes a fixing flange, an insulating corner ring fixed to the fixing flange, and at least one insulating gasket connected to the insulating corner ring. The lead wire shielding tube forms an equipotential with the outgoing device through an equipotential connection line.

[0006] In a preferred embodiment of the present invention, the sleeve passes through the riser and is inserted into the first equalizing ball, and the bottom of the sleeve is fixedly connected to the first equalizing ball.

[0007] In a preferred embodiment of the present invention, the first and second equalizing balls are provided with a pulp layer, a plurality of insulating support strip layers and a plurality of insulating molding parts in sequence from the inside to the outside.

[0008] In a preferred embodiment of the present invention, the upper shielding tube and the lead wire shielding tube have the same structure. The upper shielding tube includes an aluminum tube and a heat-modified insulating paper covering the outer wall of the aluminum tube. The end of the aluminum tube has a rounded structure.

[0009] In a preferred embodiment of the present invention, the insulating assembly comprises, from the inside to the outside, an insulating paper layer, a sulfate pulp molded paperboard, and a sulfate pulp molded part along the radial direction of the upper shielding tube.

[0010] In a preferred embodiment of the present invention, the clamping part includes a fixing member fixed to the inner wall of the lifting seat by a screw and a docking plate fixedly connected to the fixing member; the docking plate includes a body, a fixing edge disposed on one side of the body and an arc surface disposed on the other side of the body, the fixing edge is fixed to the fixing member, and the arc surface matches and fits the curvature of the outer wall of the insulating component.

[0011] In a preferred embodiment of the present invention, the fixing member includes an L-shaped beam and fixing feet disposed at both ends of the L-shaped beam, the connecting plate is fixed on the L-shaped beam, and the L-shaped beam is supported in the lifting seat by the fixing feet.

[0012] In a preferred embodiment of the present invention, both the docking plate and the fixing member are laminated paperboard.

[0013] In a preferred embodiment of the present invention, the fasteners fixed on different docking plates have a height difference.

[0014] In a preferred embodiment of the present invention, the insulating corner ring is a U-shaped corner ring with the opening facing downwards. The fixed flange, the insulating corner ring, and the insulating gasket are arranged sequentially from top to bottom. The distance between the upper shielding tube and the lead wire shielding tube can be adjusted by adjusting the number of the insulating gaskets.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: This invention assembles the first equalizing sphere, the upper shielding tube, and the second equalizing sphere into a single outgoing line device. On the one hand, the entire outgoing line device is fixed inside the riser by insulating clamps, ensuring that the upper shielding tube will not sink. On the other hand, by supporting the entire outgoing line device with the lead wire shielding tube, it is ensured that the outgoing line device will not sink, thus improving the stability and safety of the outgoing line device. Insulating gaskets and U-shaped insulating corner rings are placed between the outgoing line device and the lead wire shielding tube to insulate the outgoing line device from the lead wire shielding tube, ensuring the safety of the outgoing line device. The distance between the upper shielding tube and the lead wire shielding tube can be adjusted by adjusting the number of insulating gaskets, facilitating subsequent adjustments of the transformer outgoing line device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a front view of a converter transformer anti-sinking grid-side outgoing line device according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Enlarged schematic diagram of part B in the middle;

[0019] Figure 3 yes Figure 1 Sectional view of AA;

[0020] Figure 4 yes Figure 1 An enlarged schematic diagram of section C.

[0021] As shown in the figure: 10-lifting seat; 20-sleeve; 31-first equalizing ball; 32-upper shielding tube; 33-second equalizing ball; 331-pulp layer; 332-insulating support strip layer; 333-insulating molded part; 34-lead wire shielding tube; 41-insulating paper layer; 42-sulfate pulp molded part cardboard; 43-sulfate pulp molded part; 44-insulating pull strip; 51-butting plate; 52-L-shaped beam; 53-fixing foot; 54-screw; 61-fixing flange; 62-insulating corner ring; 63-insulating gasket. Detailed Implementation

[0022] For ease of understanding, the following embodiments illustrate a converter transformer anti-sinking grid-side outgoing line device. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation and positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0026] like Figure 1 As shown, a converter transformer anti-sinking grid-side outgoing line device is provided. The transformer includes a riser base 10, a bushing 20 fixed on the riser base 10, a lead wire shielding tube 34, and an outgoing line device disposed in the riser base 10. The lead wire shielding tube 34 supports the outgoing line device to prevent it from sinking.

[0027] The cable outlet device includes a first equalizing sphere 31, an upper shielding tube 32, and a second equalizing sphere 33, which are fixedly connected from top to bottom. The top of the upper shielding tube 32 is inserted into the first equalizing sphere 31, and the bottom of the upper shielding tube 32 is inserted into the second equalizing sphere 33. The first equalizing sphere 31, the upper shielding tube 32, and the second equalizing sphere 33 are connected by bolts and flanges to form an integral cable outlet device.

[0028] The top of the lead wire shielding tube 34 is inserted into the second equalizing ball 33 and fixed to the bottom of the upper shielding tube 32. The bottom of the lead wire shielding tube 34 is connected to other components inside the transformer tank. The lead wire shielding tube on the lead wire shielding tube 34 has multiple clamps and supports.

[0029] The sleeve 20 passes through the riser 10 and is inserted into the first equalizing ball 31. The bottom of the sleeve 20 is fixedly connected to the first equalizing ball 31.

[0030] The upper shielding tube 32 and the lead wire shielding tube 34 have the same structure. The upper shielding tube 32 includes an aluminum tube and a heat-modified insulating paper covering the outer wall of the aluminum tube. The end of the aluminum tube has a smooth structure, and its electrode shape is better.

[0031] Continue to refer to Figure 1 As shown, the upper shielding tube 32 is provided with at least one clamping assembly that is fixedly connected to the inner wall of the lifting seat 10. The clamping assembly includes an insulating component surrounding the upper shielding tube 32 and at least two clamping parts fixed to the inner wall of the lifting seat 10. The insulating component and the upper shielding tube 32 are clamped and fixed in the lifting seat 10 by a plurality of clamping parts evenly distributed around the perimeter.

[0032] Reference Figure 2 As shown, two rows of insulating straps 44 are provided on the outer wall of the insulating assembly. The insulating assembly is fixedly connected to the upper shielding tube 32 via the insulating straps 44, and the upper shielding tube 32 is fixed to the insulating assembly by the insulating straps 44. The upper and lower insulating straps 44 are in opposite directions. By applying opposite pulling forces to the upper shielding tube 32, the outgoing device is fixed. In this way, the action of the opposite straps and the support of the lead wire shielding tube 34 ensure that the outgoing device will not sink. Figure 3 As shown, the insulating assembly includes, from the inside to the outside, an insulating paper layer 41, a sulfate pulp molded paperboard 42, and a sulfate pulp molded part 43 along the radial direction of the upper shielding tube 32. This insulation method, in conjunction with the electric field outside the equalizing sphere, improves the insulation performance of the insulating assembly.

[0033] Reference Figure 3As shown, in one embodiment of the present invention, there are two clamping parts. Each clamping part includes a fixing member fixed to the inner wall of the riser 10 by a screw 54 and a docking plate 51 fixedly connected to the fixing member. Both the docking plate 51 and the fixing member are made of T4 laminated cardboard with rounded edges, forming a smooth structure to ensure even distribution of electrodes around them and enhance the insulation performance of the entire device.

[0034] Combination Figure 2 as well as Figure 3 As shown, the docking plate 51 includes a body, a fixed edge on one side of the body, and an arc surface on the other side of the body. The fixed edge is fixed to a fixing member, and the arc surface matches and fits the curvature of the outer wall of the insulating component. The fixing member includes an L-shaped beam 52 and fixing feet 53 at both ends of the L-shaped beam 52. The docking plate 51 is fixed to the L-shaped beam 52 by screws 54. The L-shaped beam 52 uses screws 54 to support the fixing feet 53 within the riser seat 10. The screws 54 in this invention are ABB high-strength screws. The fixing feet 53 are L-shaped laminated cardboard, with one side being an arc surface that fits against the inner wall of the riser seat 10, and the other side being a flat surface that connects to the docking plate 51.

[0035] In actual use, because the upper shielding tube 32 is fixed to the inner wall of the riser 10 and the lead wire shielding tube 34, the insertion depth of the bushing 20 cannot be adjusted, thus failing to meet the operating requirements of the transformer. Based on the above solution, this invention also discloses the fixing components and adjustment method between the upper shielding tube 32 and the lead wire shielding tube 34.

[0036] like Figure 4 As shown, the upper shielding tube 32 and the lead wire shielding tube 34 are connected and fixed inside the second equalizing ball 33. A fixing assembly is provided between the upper shielding tube 32 and the lead wire shielding tube 34. The fixing assembly includes a fixing flange 61, an insulating corner ring 62 fixed to the fixing flange 61, and at least one insulating gasket 63 connected to the insulating corner ring 62. The lead wire shielding tube 34 forms an equipotential with the outgoing device through an equipotential connection.

[0037] The insulating corner ring 62 is a U-shaped corner ring with its opening facing downwards. The fixed flange 61, insulating corner ring 62, and insulating gasket 63 are arranged sequentially from top to bottom. The insulating corner ring 62 covers the fixed flange 61, ensuring complete insulation between the upper shielding tube 32 and the lead wire shielding tube 34, preventing discharge accidents caused by poor contact. The distance between the upper shielding tube 32 and the lead wire shielding tube 34 is adjusted by changing the number of insulating gaskets 63, ensuring the correct insertion depth of the sleeve 20 into the outlet device. First, install the insulating gasket 63 and U-shaped corner ring according to standard dimensions, then place the upper outlet device, insert the sleeve 20, and measure the insertion depth. If necessary, remove the sleeve 20 and outlet device, increase or decrease the number of insulating gaskets 63, and reinstall the outlet device.

[0038] Continue to refer to Figure 4 As shown, the first equalizing ball 31 and the second equalizing ball 33 have the same structure. Taking the second equalizing ball 33 as an example, it is provided with a pulp layer 331, a number of insulating support strip layers 332 and a number of insulating molding parts 333 from the inside to the outside. This can effectively reduce the electric field intensity on the surface of the equalizing ball and has higher insulation reliability than the current wire-side output device.

[0039] In summary, this invention employs a lead-out device that integrates the first equalizing ball 31, the upper shielding tube 32, and the second equalizing ball 33 into a single unit. On one hand, the entire lead-out device is fixed inside the riser 10 by insulating clamps, ensuring that the upper shielding tube 32 will not sink. On the other hand, the entire lead-out device is supported by the lead wire shielding tube 34, further ensuring that the lead-out device will not sink, thus improving its stability and safety. Insulating gaskets 63 and U-shaped insulating corner rings 62 are placed between the lead-out device and the lead wire shielding tube 34 to insulate them, ensuring the safety of the lead-out device. The distance between the upper shielding tube 32 and the lead wire shielding tube 34 can be adjusted by changing the number of insulating gaskets 63, facilitating subsequent adjustments to the transformer lead-out device.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sinking-preventing bushing-outlet device of a converter transformer, the converter transformer comprising a riser, a bushing fixed on the riser, a lead shield tube fixed inside the converter transformer, and a bushing-outlet device fixed on the top of the lead shield tube, characterized in that the lead shield tube supports the bushing-outlet device to prevent the bushing-outlet device from sinking; the bushing-outlet device comprises, from top to bottom, a first grading sphere, an upper shield tube, and a second grading sphere fixedly connected in sequence; the upper shield tube is provided with at least one clamping assembly fixedly connected with the inner wall of the riser, the clamping assembly comprises an insulation assembly surrounding the upper shield tube and at least two clamping portions fixed on the inner wall of the riser, and the insulation assembly and the upper shield tube are clamped and fixed on the riser by the evenly distributed multiple clamping portions; a fixing assembly is arranged between the upper shield tube and the lead shield tube, the fixing assembly comprises a fixing flange, an insulation corner ring fixed with the fixing flange, and at least one insulation gasket in contact with the insulation corner ring, and the lead shield tube is in equipotential with the bushing-outlet device through an equal-potential connecting wire; the bushing passes through the riser and is inserted into the first grading sphere, and the bottom of the bushing is fixedly connected with the first grading sphere; the first grading sphere and the second grading sphere are sequentially provided, from inside to outside, with a pulp layer, a plurality of insulation stay layers, and a plurality of insulation molded pieces; the upper shield tube and the lead shield tube have the same structure, the upper shield tube comprises an aluminum tube and a heat-modified insulation paper wrapped on the outer wall of the aluminum tube, and the end of the aluminum tube is in a smooth structure; the insulation assembly comprises, from inside to outside along the radial direction of the upper shield tube, an insulation paper layer, a sulfate pulp molded piece paperboard, and a sulfate pulp molded piece; the clamping portion comprises a fixing piece fixed on the inner wall of the riser by a screw rod and a butt plate fixedly connected with the fixing piece; the butt plate comprises a body, a fixed edge provided on one side of the body, and an arc surface provided on the other side of the body, the fixed edge is fixed on the fixing piece, and the arc surface is matched with and in contact with the outer wall of the insulation assembly; the fixing piece comprises an L-shaped beam and fixing feet provided at both ends of the L-shaped beam, the butt plate is fixed on the L-shaped beam, and the L-shaped beam is arranged in the riser through the fixing feet; the butt plate and the fixing piece are both laminated paper boards; the fixing pieces fixed on different butt plates have a height difference; the insulation corner ring is a U-shaped corner ring, the opening direction of the insulation corner ring is downward, the fixing flange, the insulation corner ring, and the insulation gasket are sequentially arranged from top to bottom, and the distance between the upper shield tube and the lead shield tube is adjusted by adjusting the number of the insulation gaskets. ​ ​ ​ 2. The sinking-preventing network-side outlet device of a converter transformer according to claim 1, characterized in that: ​ 3. The sinking-preventing network-side outlet device of a converter transformer according to claim 1, characterized in that: ​ 4. The sinking-preventing network-side outlet device of a converter transformer according to claim 1, characterized in that: ​ 5. The sinking-preventing network-side outlet device of a converter transformer according to claim 1, characterized in that: ​ 6. The sinking-preventing network-side outlet device of a converter transformer according to claim 1, characterized in that: ​ ​ 7. The sinking-preventing network-side outlet device of a converter transformer according to claim 6, characterized in that: ​ 8. The sinking-preventing network-side outlet device of a converter transformer according to claim 6, characterized in that: ​ 9. The sinking-preventing network-side outlet device of a converter transformer according to claim 6, characterized in that: ​ 10. The sinking-preventing network-side outlet device of a converter transformer according to claim 1, characterized in that: ​

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