Method for assembling combined valve side wire outlet device of + / -800kV converter transformer

Abstract

The invention belongs to the field of transformers, and relates to a + / -800kV converter transformer combined valve side outgoing line device assembling method, an angle ring I is arranged above a voltage-sharing ball, an angle ring II is arranged on the periphery of the voltage-sharing ball, an oil paper insulation structure I comprises a plurality of layers of insulation cylinders, and a plurality of insulation supporting strips corresponding in position are uniformly distributed between adjacent insulation cylinders in the circumferential direction; insulating oil is contained in a cavity between every two adjacent insulating cylinders, the insulating supporting strips are fixed to the insulating cylinders on the two sides in an adhesive mode, the ends of the insulating supporting strips and the ends of the insulating cylinders are fixed through rivets, the first oiled paper insulating structure is assembled on the periphery of the second angle ring, and the insulating supporting strips are arranged on the outermost layers of the second oiled paper insulating structure and the third oiled paper insulating structure. The second oil paper insulation structure is assembled on the periphery of the first angle ring, and the first oil paper insulation structure, the second oil paper insulation structure and the third oil paper insulation structure are assembled on the side wall of the valve side ascending flanged base through the adjusting assembly mechanism, the first fixed supporting structure and the second fixed supporting structure respectively. The high-voltage switch cabinet is excellent in overall performance, high in insulation margin, good in structural strength and simple in installation process.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to an assembly method of a combined valve-side outlet device for a ±800kV converter transformer, and is suitable for assembling a converter transformer with a voltage level of ±800kV. Background Art

[0002] The valve-side lead-out device of the converter transformer is usually a complex oil-paper insulation system consisting of an insulating paper tube, oil gap stays, support pads, equalizing balls and connecting fastening devices. By performing electric field shielding on the connecting leads between the valve-side coil and the valve-side bushing of the converter transformer, the AC and DC electric field distribution of the valve-side leads and the tail of the valve-side bushing is improved, ensuring reliable connection between the connecting leads and the terminals in the bushing oil.

[0003] The valve side outlet device mostly adopts a cardboard plus support bar structure, fixed with adhesive, and partially uses insulating screws to increase mechanical strength. The installation and production of the valve side outlet device are relatively complicated, and the production efficiency is relatively low. The valve side outlet device of the converter transformer is generally installed in the valve side riser, and is installed on the converter transformer body after the valve side riser is tilted at a certain angle. During the operation of the converter transformer, the valve side outlet device is affected by its own gravity and the vibration of the converter transformer during operation. It may be displaced along the gravity or tilt direction, resulting in a reduction in its insulation margin, or even discharge, which seriously affects the safe operation of the converter transformer. Summary of the invention

[0004] Aiming at the technical disadvantages of the existing insulation support structure of the valve-side outlet device, such as poor mechanical stability and inconvenient assembly, the present invention proposes an assembly method for a combined valve-side outlet device of a ±800kV converter transformer. The technical solution adopted by the present invention is as follows: The invention discloses an assembly method of a combined valve-side outlet device for a ±800kV converter transformer, wherein the valve-side outlet device comprises a voltage-equalizing ball and an oil-paper insulation structure located at the periphery of the voltage-equalizing ball and above the voltage-equalizing ball, wherein an angle ring 1 is assembled above the upper arc of the voltage-equalizing ball, and an angle ring 2 with a matching shape is assembled at the periphery of the voltage-equalizing ball, wherein the oil-paper insulation structure comprises an oil-paper insulation structure 1, an oil-paper insulation structure 2 and an oil-paper insulation structure 3 with upper and lower riveted plug-in structures, wherein the oil-paper insulation structure 1 comprises a plurality of layers of insulation cylinders, and a plurality of insulation stays in the vertical direction and corresponding to the positions are evenly arranged between adjacent insulation cylinders in the circumferential direction, and the cavity between adjacent insulation cylinders contains insulation oil, and the insulation stays are connected to the two sides. The insulating tube is bonded and fixed, and the ends of the insulating support bar and the insulating tube are fixed with rivets, the oil-paper insulating structure one is assembled on the outer periphery of the angle ring two, the outermost layers of the oil-paper insulating structure two and the oil-paper insulating structure three are insulating support bars, the oil-paper insulating structure two is assembled on the outer periphery of the angle ring one, the oil-paper insulating structure one, the oil-paper insulating structure two and the oil-paper insulating structure three are assembled on the corresponding valve side rising seat side walls through independent adjustment assembly mechanisms, fixed support structures one and fixed support structures two respectively, and finally the oil-paper insulating structure one, the oil-paper insulating structure two and the oil-paper insulating structure are riveted together from top to bottom to form a complete valve side outlet device.

[0005] Preferably, a plurality of vertical adjustment assembly mechanisms are evenly distributed between the oil-paper insulation structure 1 and the side wall of the valve side elevation seat, the adjustment assembly mechanism includes a second support wire clamp, a lower adjustment strut, an upper adjustment strut, a pair of side support struts and a horizontal support strut. The second support wire clamp and the horizontal support strut are arc structures that match the side wall of the valve side elevation seat. The second support wire clamp is installed on the side wall of the valve side elevation seat through an insulating screw, the horizontal support strut is installed on the upper end of the second support wire clamp, the upper end of the side support strut is fixedly connected to the side wall of the valve side elevation seat through an insulating screw, the lower end of the side support strut is fixedly connected to the horizontal support strut, the lower end of the lower adjustment strut is fixedly connected to the horizontal support strut, the lower adjustment strut is located in the middle position of a pair of side support struts, and the lower end of the upper adjustment strut and the upper end of the lower adjustment strut are provided with mutually matching slopes.

[0006] Preferably, a plurality of vertical fixed support structures 1 are evenly distributed between the oil-paper insulation structure 2 and the side wall of the valve side elevated seat, the fixed support structure 1 comprising a fixed wire clamp 1, a supporting wire clamp 1, an adjusting plate, a fixed wire clamp 2 and an insulating ring 1, the wire clamp 1 is fixedly connected to the inner wall of the valve side elevated seat side wall through an insulating screw, the supporting wire clamp 1 is installed on the wire clamp 1, the supporting wire clamp 1 clamps the outermost insulating support bar of the supporting oil-paper insulation structure 2, an adjusting plate is arranged between the wire clamp 1 and the inner wall of the valve side elevated seat side wall, the lower end of the fixed wire clamp 2 is installed on the fixed wire clamp 1, the outer side of the fixed wire clamp 2 is fixed to the inner wall of the valve side elevated seat side wall, a lifting groove is opened on the inner upper part of the fixed wire clamp 2, and the insulating ring 1 is installed in the lifting groove.

[0007] Preferably, a plurality of fixed support structures 2 are evenly distributed between the oil-paper insulation structure 3 and the side wall of the valve side raised seat, the fixed support structure 2 includes a fixed wire clamp 3, the fixed wire clamp 3 is a long strip with a boss on the inner side, the outer side of the fixed wire clamp 3 is assembled on the inner wall of the valve side raised seat through an insulating screw, a horizontal slot is provided on the inner boss of the fixed wire clamp 3, the outer sides of the supporting insulating rings 2 and 3 are clamped in the slot, screws are provided on the insulating rings 2 and 3, the screws are fixedly connected to the oil-paper insulation structure 3, the inner sides of the insulating rings 2 and 3 are close to the outermost insulating support bars of the oil-paper insulation structure 3.

[0008] Preferably, the insulating tube and the insulating support bar are made of laminated paperboard.

[0009] Beneficial effects of the present invention: The combined valve-side outlet device has excellent overall performance, high insulation margin, good structural strength, simple installation process, and is easy to organize production and cooperate with installation. The three-part oil-paper insulation structure has a completely independent insulation structure and fixing mechanism. The three parts can be produced at the same time and then assembled with their respective valve-side riser seats, which improves the convenience of assembly and the production efficiency of the valve-side outlet device. The structure of the valve-side outlet device after overall assembly is more stable and has higher support strength. The number of insulation cylinder layers of the three-part oil-paper insulation structure is increased, which further improves the insulation margin of the matching parts, which is conducive to improving the overall electrical strength and mechanical strength of the valve-side outlet device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a cross-sectional view of the center position of the outlet device of an embodiment of the present invention; Figure 2 2a is a schematic diagram of the structure of the adjustment assembly mechanism of an embodiment of the present invention, 2b is a left side view, and 2c is a top view; Figure 3 is a schematic diagram of a fixed support structure 1 according to an embodiment of the present invention; Figure 4 4a is a schematic diagram of a second fixed support structure according to an embodiment of the present invention, wherein 4a is a top view and 4b is an AA view; Figure 5 is a top view of an oil-paper insulation structure 1 according to an embodiment of the present invention; In the figure: 1 is a pressure equalizing ball, 2 is an oil-paper insulation structure 1, 3 is an oil-paper insulation structure 2, 4 is an oil-paper insulation structure 3, 5 is an adjustment assembly mechanism, 6 is a fixed support structure 1, 7 is a fixed support structure 2, 8 is a fixed wire clamp 1, 9 is a support wire clamp 1, 10 is an adjustment plate, 11 is a fixed wire clamp 2, 12 is an insulating ring 1, 13 is a fixed wire clamp 3, 14 is an insulating ring 2, 15 is an insulating ring 3, 16 is an angle ring 1, 17 is an angle ring 2, 18 is a support stay, 19 is a support wire clamp 2, 20 is a lower adjustment stay, 21 is an upper adjustment stay, 22 is a valve side riser seat side wall, 23 is an insulating cylinder, 24 is an insulating stay, and 25 is a horizontal support stay. DETAILED DESCRIPTION

[0011] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0012] like Figure 1 As shown, the assembly method of the combined valve-side outlet device of the ±800kV converter transformer is shown, the main body of the valve-side outlet device is composed of a voltage-equalizing ball 1, an oil-paper insulation structure 1 2, an oil-paper insulation structure 2 3, an oil-paper insulation structure 3 4, an adjustment assembly mechanism 5, a fixed support structure 1 6 and a fixed support structure 2 7, and the adjustment assembly mechanism 5, the fixed support structure 1 6 and the fixed support structure 2 7 are evenly arranged at four locations on the circumference of the inner wall of the valve-side raised seat side wall 22.

[0013] The outer surface of the pressure-equalizing ball 1 is wrapped with kraft pulp, a molded corner ring 16 is installed above the upper arc of the pressure-equalizing ball 1, and a molded corner ring 2 17 with a matching shape is installed on the outer periphery of the pressure-equalizing ball 1. The pressure-equalizing ball 1 is protected by the corner ring 16 and the corner ring 2 17. The pressure-equalizing ball 1, the corner ring 1 16 and the corner ring 2 17 are all supported and fixed by pads (considering the simplicity of the composition, Figure 1 The outer surfaces of the angle rings 16 and 17 are wrapped with sulphate pulp. The sulphate pulp becomes solid after drying. The specific process of wrapping the sulphate pulp on the outer surfaces of the pressure equalizing ball 1, the angle rings 16 and 17 is irrelevant to the embodiment of the present invention and will not be described in detail here.

[0014] Oil-paper insulation in transformers refers to an insulation system formed by a combination of insulating paper and insulating oil. Insulating paper is generally cellulose paper, which has good electrical insulation and mechanical properties. Insulating oil is usually mineral oil or vegetable oil, such as commonly used transformer oil. Insulating paper and insulating oil work together to form a complete insulation system. Insulating paper can prevent the passage of current, and insulating oil fills the gaps in the paper to further improve the insulation effect. At the same time, the fluidity of insulating oil can prevent local overheating and protect insulating paper from high temperature damage. During the operation of the transformer, they work together to ensure the safe and stable operation of the transformer.

[0015] The oil-paper insulation structure 12 is fixedly installed between the outer periphery of the angle ring 16 and the angle ring 2 17 and the side wall 22 of the valve side raised seat. Figure 5 As shown, the oil-paper insulation structure 1 2 includes several layers of insulation tubes 23 made of insulation paper, and eight vertical and corresponding insulation stays 24 are evenly arranged between two adjacent layers of insulation tubes 23 in the circumferential direction. The cavity between the adjacent insulation tubes 23 contains insulating oil, and the insulation stays 24 are bonded and fixed to the insulation tubes 23 on both sides, and the ends of the insulation stays 24 and the insulation tubes 23 are fixed with rivets. The oil-paper insulation structure 1 2 cooperates with the angle ring 1 16 and the angle ring 2 17 to protect the equalizing ball 1 and the sleeve, and the sleeve passes through the equalizing ball 1. The upper parts of the several layers of insulation tubes 23 are of the same height, and the lower parts of the several layers of insulation tubes 23 form a stepped structure, and the insulation tubes 23 closer to the outside are shorter. When the insulation stays 24 and the lower ends of the insulation tubes 23 are fixed with rivets, the lower ends of the insulation tubes 23 and the insulation stays 24 on the outside are used as references.

[0016] like Figure 2As shown, the adjustment assembly mechanism 5 includes a second support wire clamp 19, a lower adjustment stay 20, an upper adjustment stay 21, a pair of side support stays 18 and a horizontal support stay 25. The second support wire clamp 19 and the horizontal support stay 25 are arc structures that match the side wall 22 of the valve side raised seat. The second support wire clamp 19 is fixedly installed on the side wall 22 of the valve side raised seat through an insulating screw. The horizontal support stay 25 is fixedly installed on the upper end of the second support wire clamp 19. The upper ends of the pair of side support stays 18 are fixedly connected to the side wall 22 of the valve side raised seat through an insulating screw, and the lower ends of the side support stays 18 are fixedly connected to the horizontal support stay 25 The lower end of the lower adjustment stay 20 is fixedly connected to the horizontal support stay 25, and the lower adjustment stay 20 is located in the middle position of a pair of side support stays 18. The upper adjustment stay 21 and the outer wall of the outermost insulating tube 23 of the oil-paper insulation structure 2 are interference fit to fix the oil-paper insulation structure 2. The lower end of the upper adjustment stay 21 and the upper end of the lower adjustment stay 20 are provided with mutually matching slopes. The upper adjustment stay 21 and the lower adjustment stay 20 overlap in the vertical direction. The oil-paper insulation structure 2 is fixed by the upper adjustment stay 21 and the lower adjustment stay 20 matched with the slopes, and the height and angle of the oil-paper insulation structure 2 can be conveniently adjusted by the slopes.

[0017] The main structure of the oil-paper insulation structure 23 is basically the same as that of the oil-paper insulation structure 12, except that the number of layers is different, and the outermost layer of the oil-paper insulation structure 23 is the insulation support bar 24. The oil-paper insulation structure 23 and the oil-paper insulation structure 12 use the same layer of paper tube support bars riveted up and down to fix the circumference. The upper end of the paper tube support bar of the oil-paper insulation structure 12 and the lower end of the paper tube support bar of the oil-paper insulation structure 23 are provided with a mutually matching riveted structure. During assembly, the lower end of the paper tube support bar of the oil-paper insulation structure 23 is inserted into the upper end of the paper tube support bar of the oil-paper insulation structure 12, ensuring that a small margin is left inside and outside each layer of the insulation support bar structure as the assembly adjustment range. The lower end of the insulation support bar of the oil-paper insulation structure 23 is stepped, and the closer to the outer paper tube, the shorter it is, which is convenient for observation and adjustment of the plug-in. The upper part of the outermost paper tube of the oil-paper insulation structure 23 is fixedly connected to the inner wall of the valve side riser side wall 22 using an insulating screw through the fixed support structure 16.

[0018] like Figure 3As shown, the fixed support structure 16 includes a fixed wire clamp 18, a supporting wire clamp 19, an adjusting plate 10, a fixed wire clamp 211 and an insulating ring 12. The wire clamp 18 is fixedly connected to the inner wall of the valve side elevated seat side wall 22 by an insulating screw, and the supporting wire clamp 19 is fixedly installed on the wire clamp 18. The supporting wire clamp 19 is used to clamp the outermost insulating stay of the supporting oil-paper insulation structure 23. An adjusting plate 10 is arranged between the wire clamp 18 and the inner wall of the valve side elevated seat side wall 22, and the relative position of the supporting wire clamp 9 and the outermost paper tube of the oil-paper insulation structure 23 is adjusted by the adjusting plate 10. The lower end of the fixed wire clamp 211 is fixedly installed on the fixed wire clamp 18, the outer side of the fixed wire clamp 211 is fixed on the inner wall of the valve side elevated seat side wall 22, a lifting groove is opened on the upper inner side of the fixed wire clamp 211, and the insulating ring 12 is fixedly installed in the lifting groove.

[0019] The main structure of the oil-paper insulation structure 34 is basically the same as that of the oil-paper insulation structure 12, except that the number of layers is different, and the outermost layer of the oil-paper insulation structure 34 is the insulation stay 24. The oil-paper insulation structure 34 and the oil-paper insulation structure 23 use the same layer of paper tube stays riveted up and down to fix the circumference, and the plug-in structure of the oil-paper insulation structure 34 and the oil-paper insulation structure 23 is the same as that of the oil-paper insulation structure 23 and the oil-paper insulation structure 12.

[0020] The outlet device is designed with oil-paper insulation structures with different numbers of layers and different insulation lengths at different heights. The reason is that from the radial distribution of the bushing, the electric field strength of the oil-paper insulation part close to the conductive rod is relatively high. Because the conductive rod is the source of the electric field, the closer to the conductive rod, the greater the electric field strength. As it moves away from the conductive rod, the electric field strength gradually decreases. During the design and manufacturing process, the length, thickness and quality of the oil-paper insulation structure will be reasonably arranged according to the distribution of the electric field strength.

[0021] like Figure 4 As shown, the fixed support structure 27 includes a fixed wire clamp 3 13, which is a long strip with a boss on the inner side. The outer side of the fixed wire clamp 3 13 is assembled on the inner wall of the valve side raised seat side wall 22 through an insulating screw. A horizontal card slot is provided on the inner side boss of the fixed wire clamp 3 13, and the card slot is used to support the insulating ring 2 14 and the insulating ring 3 15. The outer sides of the supporting insulating ring 2 14 and the insulating ring 3 15 are clamped in the card slot. The insulating ring 2 14 and the insulating ring 3 15 are provided with screws. The direction of the oil-paper insulation structure 3 4 is locked by the screws on the insulating ring 2 14 and the insulating ring 3 15 to prevent the oil-paper insulation structure 3 4 from rotating. At the same time, the inner sides of the insulating ring 2 14 and the insulating ring 3 15 are tightly attached to the outermost insulating stay of the oil-paper insulation structure 3 4. By adjusting the positions of the insulating ring 2 14 and the insulating ring 3 15, the position of the oil-paper insulation structure 3 4 can be fixed. The insulating ring 2 14 and the insulating ring 3 15 clamp the insulating stay and apply force to the insulating stay.

[0022] The insulating tube 23 and the insulating stay 24 are made of laminated paperboard.

[0023] The assembly method of the combined valve-side outlet device of the ±800kV converter transformer provided in the embodiment of the present invention is equipped with three independent oil-paper insulation structures, and the three oil-paper insulation structures are respectively assembled with the raised seats on the side of each section valve, thereby improving the assembly efficiency and application economy of the valve-side outlet device. The three sets of oil-paper insulation structures each perform their respective functions while cooperating with each other and integrating into a whole, which makes installation and coordination more convenient, and the structure after overall assembly is more stable, the number of insulation layers at the supporting coordination part increases, the oil gap field strength value decreases, and the overall electrical strength and mechanical strength of the valve-side outlet device are further improved. Due to the high voltage level of ±800kV, more insulating parts are required for electrical insulation. If a valve-side outlet device structure with an upper and lower integrated structure is used, the overall weight is greater, and due to space limitations, it is impossible to effectively support the middle position of the valve-side outlet device. This design adopts a three-part mutually plugged oil-paper insulation structure, and each part has a separate fixed structure, which can effectively increase the number of fixed points, so the assembled valve-side outlet device structure is more stable.

[0024] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0025] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A method for assembling a combined valve-side outlet device for a ±800kV converter transformer, wherein the valve-side outlet device comprises a voltage-equalizing ball and an oil-paper insulation structure located on the periphery and above the voltage-equalizing ball, wherein an angle ring 1 is assembled above the upper arc of the voltage-equalizing ball, and an angle ring 2 with a matching shape is assembled on the periphery of the voltage-equalizing ball, wherein: The oil-paper insulation structure comprises an oil-paper insulation structure 1, an oil-paper insulation structure 2 and an oil-paper insulation structure 3 of upper and lower riveted and plugged structures. The oil-paper insulation structure 1 comprises several layers of insulation cylinders. Several insulating stays in the vertical direction and corresponding to the positions are evenly arranged between adjacent insulation cylinders in the circumferential direction. Insulating oil is contained in the cavity between adjacent insulation cylinders. The insulating stays are bonded and fixed to the insulation cylinders on both sides, and the ends of the insulating stays and the insulation cylinders are fixed with rivets. The oil-paper insulation structure 1 is assembled on the outer periphery of the angle ring 2. The outermost layers of the oil-paper insulation structure 2 and the oil-paper insulation structure 3 are insulating stays. The oil-paper insulation structure 2 is assembled on the outer periphery of the angle ring 1. The oil-paper insulation structure 1, the oil-paper insulation structure 2 and the oil-paper insulation structure 3 are assembled on the corresponding valve side elevated seat side walls through independent adjustment and assembly mechanisms, fixed support structure 1 and fixed support structure 2 respectively. Finally, the oil-paper insulation structure 1, the oil-paper insulation structure 2 and the oil-paper insulation structure are riveted and plugged into one piece up and down to form a complete valve side outlet device.

2. The method for assembling the combined valve-side outlet device of the ±800kV converter transformer according to claim 1 is characterized in that: A plurality of vertical adjustment assembly mechanisms are evenly distributed between the oil-paper insulation structure 1 and the side wall of the valve side elevation seat, the adjustment assembly mechanism comprising a second support wire clamp, a lower adjustment strut, an upper adjustment strut, a pair of side support struts and a horizontal support strut. The second support wire clamp and the horizontal support strut are arc structures that match the side wall of the valve side elevation seat. The second support wire clamp is installed on the side wall of the valve side elevation seat through an insulating screw, the horizontal support strut is installed on the upper end of the second support wire clamp, the upper end of the side support strut is fixedly connected to the side wall of the valve side elevation seat through an insulating screw, the lower end of the side support strut is fixedly connected to the horizontal support strut, the lower end of the lower adjustment strut is fixedly connected to the horizontal support strut, the lower adjustment strut is located in the middle position of a pair of side support struts, and the lower end of the upper adjustment strut and the upper end of the lower adjustment strut are provided with slopes that match each other.

3. The method for assembling the combined valve-side outlet device of the ±800kV converter transformer according to claim 1 is characterized in that: A plurality of vertical fixed support structures are evenly distributed between the oil-paper insulation structure 2 and the side wall of the valve side elevation seat, wherein the fixed support structure 1 comprises a fixed wire clamp 1, a supporting wire clamp 1, an adjusting plate, a fixed wire clamp 2 and an insulating ring 1. The wire clamp 1 is fixedly connected to the inner wall of the side wall of the valve side elevation seat through an insulating screw, the supporting wire clamp 1 is installed on the wire clamp 1, the supporting wire clamp 1 clamps the outermost insulating stay of the supporting oil-paper insulation structure 2, an adjusting plate is arranged between the wire clamp 1 and the inner wall of the side wall of the valve side elevation seat, the lower end of the fixed wire clamp 2 is installed on the fixed wire clamp 1, the outer side of the fixed wire clamp 2 is fixed to the inner wall of the side wall of the valve side elevation seat, a lifting groove is opened on the upper inner side of the fixed wire clamp 2, and the insulating ring 1 is installed in the lifting groove.

4. The method for assembling the combined valve-side outlet device of the ±800kV converter transformer according to claim 1 is characterized in that: Several fixed support structures 2 are evenly distributed between the oil-paper insulation structure 3 and the side wall of the valve side raised seat, the fixed support structure 2 includes a fixed wire clamp 3, the fixed wire clamp 3 is a long strip with a boss on the inner side, the outer side of the fixed wire clamp 3 is assembled on the inner wall of the valve side raised seat through an insulating screw, a horizontal slot is provided on the inner boss of the fixed wire clamp 3, the outer sides of the supporting insulating rings 2 and 3 are clamped in the slot, screws are provided on the insulating rings 2 and 3, the screws are fixedly connected to the oil-paper insulation structure 3, the inner sides of the insulating rings 2 and 3 are close to the outermost insulating support bars of the oil-paper insulation structure 3.

5. According to the assembly method of the combined valve-side outlet device of the ±800kV converter transformer according to any one of claims 1 to 4, the material of the insulating cylinder and the insulating support bar is laminated paperboard.

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