Combined valve side wire outlet device of + / -800kV converter transformer

Abstract

The utility model belongs to the field of transformers, and relates to a + / -800kV converter transformer combined type valve side wire outlet device which comprises a voltage-sharing ball and oil paper insulation structures located on the periphery of the voltage-sharing ball, and the oil paper insulation structures comprise a first oil paper insulation structure, a second oil paper insulation structure and a third oil paper insulation structure which are vertically connected in an inserted mode. The first oil paper insulation structure comprises a plurality of layers of insulation cylinders, a plurality of insulation supporting strips which are in the vertical direction and correspond in position are evenly distributed between every two adjacent insulation cylinders in the circumferential direction, insulation oil is contained in a cavity between every two adjacent insulation cylinders, the insulation supporting strips are fixed to the insulation cylinders on the two sides in an adhesive mode, and the ends of the insulation supporting strips and the ends of the insulation cylinders are fixed through rivets. The outermost layer of the second oil paper insulation structure and the outermost layer of the third oil paper insulation structure are insulation supporting strips, and the first oil paper insulation structure, the second oil paper insulation structure and the third oil paper insulation structure are fixedly connected with the side wall of the valve side ascending flanged base through independent fixing mechanisms respectively. The utility model has the advantages of excellent overall performance, high insulation margin, good structural strength and simple installation process.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, and specifically relates to a combined valve-side output device for ±800kV converter transformers, which is suitable for assembling converter transformers with a voltage level of ±800kV. Background Technology

[0002] The valve-side outgoing line device of a converter transformer is usually a complex oil-paper insulation system consisting of insulating paper tubes, oil gap support bars, support pads, equalizing balls, and connecting fastening devices. By shielding the electric field of the connecting lead between the valve-side coil and the valve-side bushing of the converter transformer, it improves the AC and DC electric field distribution of the valve-side lead and the tail of the valve-side bushing, and ensures reliable connection between the connecting lead and the bushing oil terminal.

[0003] Valve-side cable outlet devices typically employ a cardboard and support strip structure, secured with adhesive. Insulating screws are used in some areas to increase mechanical strength. The installation and production of valve-side cable outlet devices are relatively complex and inefficient. The valve-side cable outlet device of a converter transformer is generally assembled within a valve-side riser seat and is mounted on the transformer body after tilting at a certain angle with the riser seat. During transformer operation, the valve-side cable outlet device may shift along the direction of gravity or tilt due to its own weight and vibrations, leading to a reduction in insulation margin and even discharge, severely impacting the safe operation of the converter transformer. Summary of the Invention

[0004] To address the technical shortcomings of existing valve-side outgoing line devices, such as poor mechanical stability and inconvenient assembly, this utility model proposes a ±800kV converter transformer combined valve-side outgoing line device. The technical solution adopted by this utility model is as follows:

[0005] A combined valve-side outgoing line device for a ±800kV converter transformer includes an equalizing ball and an oil-paper insulation structure located on the outer periphery and above the equalizing ball. The oil-paper insulation structure includes three oil-paper insulation structures: a first oil-paper insulation structure, a second oil-paper insulation structure, and a third oil-paper insulation structure, which are riveted and inserted vertically. The first oil-paper insulation structure includes several layers of insulating cylinders. Several vertically aligned insulating support strips are evenly distributed in the circumferential direction between adjacent insulating cylinders. Insulating oil is contained in the cavity between adjacent insulating cylinders. The insulating support strips are bonded and fixed to the insulating cylinders on both sides, and are fixed with rivets at the ends of the insulating support strips and insulating cylinders. The outermost layers of the second and third oil-paper insulation structures are insulating support strips. The first, second, and third oil-paper insulation structures are respectively fixedly connected to the side wall of the valve-side riser seat through independent fixing mechanisms.

[0006] Preferably, a first corner ring is installed above the upper arc of the equalizing sphere, and a second corner ring with a matching shape is installed on the outer periphery of the equalizing sphere.

[0007] Preferably, an oil-paper insulation structure is installed between the outer periphery of corner ring one and corner ring two and the side wall of the valve-side riser seat.

[0008] Preferably, several vertical adjustment assembly mechanisms are evenly distributed between the first oil-paper insulation structure and the side wall of the valve-side riser seat. The adjustment assembly mechanism includes a second support wire clamp, a lower adjustment support bar, an upper adjustment support bar, a pair of side support bars, and a horizontal support bar. The second support wire clamp and the horizontal support bar are arc structures that cooperate with the side wall of the valve-side riser seat. The second support wire clamp is installed on the side wall of the valve-side riser seat by an insulating screw. The horizontal support bar is installed on the upper end of the second support wire clamp. The upper end of the side support bar is fixedly connected to the side wall of the valve-side riser seat by an insulating screw. The lower end of the side support bar is fixedly connected to the horizontal support bar. The lower end of the lower adjustment bar is fixedly connected to the horizontal support bar. The lower adjustment bar is located in the middle of the pair of side support bars. The lower end of the upper adjustment bar and the upper end of the lower adjustment bar are provided with mutually cooperating ramps.

[0009] Preferably, several vertical fixed support structures are evenly distributed between the second oil-paper insulation structure and the side wall of the valve-side riser seat. The first fixed support structure includes a first fixed wire clamp, a first supporting wire clamp, an adjusting plate, a second fixed wire clamp, and a first insulating ring. The first wire clamp is fixedly connected to the inner wall of the side wall of the valve-side riser seat through an insulating screw. The first supporting wire clamp is installed on the first wire clamp and clamps the outermost insulating support bar of the second oil-paper insulation structure. An adjusting plate is provided between the first wire clamp and the inner wall of the side wall of the valve-side riser seat. The lower end of the second fixed wire clamp is installed on the first fixed wire clamp, and the outer side of the second fixed wire clamp is fixed to the inner wall of the side wall of the valve-side riser seat. A lifting groove is opened on the upper inner side of the second fixed wire clamp, and the first insulating ring is installed in the lifting groove.

[0010] Preferably, several fixed support structures II are evenly distributed between the oil-paper insulation structure III and the side wall of the valve-side riser seat. Each fixed support structure II includes a fixed wire clamp III, which is a long strip plate with a protrusion on its inner side. The outer side of the fixed wire clamp III is assembled to the inner wall of the valve-side riser seat side wall by an insulating screw. A horizontal slot is opened on the inner protrusion of the fixed wire clamp III. The outer side of the supporting insulating ring II and the insulating ring III is fitted into the slot. A screw is provided on the insulating ring II and the insulating ring III, and the screw is fixedly connected to the oil-paper insulation structure III. The inner side of the insulating ring II and the insulating ring III is in close contact with the outermost insulating support strip of the oil-paper insulation structure III.

[0011] Preferably, the insulating cylinder and the insulating support strip are made of laminated paperboard.

[0012] The beneficial effects of this utility model are:

[0013] The modular valve-side wiring device boasts superior overall performance, high insulation margin, strong structure, and simple installation process, facilitating production organization and coordinated installation. The three-part oil-paper insulation structure features completely independent insulation structures and fixing mechanisms. All three parts can be produced simultaneously and then assembled separately with their respective valve-side riser seats, improving assembly convenience and production efficiency. The assembled valve-side wiring device exhibits a more stable structure and higher support strength. The increased number of insulation layers in the three-part oil-paper insulation structure further enhances the insulation margin at mating points, contributing to improved overall electrical and mechanical strength of the valve-side wiring device. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a cross-sectional view of the center position of the wire-out device according to an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the adjustment assembly mechanism according to an embodiment of the present utility model. 2a is a front view, 2b is a left view, and 2c is a top view.

[0017] Figure 3 This is a schematic diagram of a fixed support structure according to an embodiment of the present utility model;

[0018] Figure 4 This is a schematic diagram of the second fixed support structure according to an embodiment of the present utility model. 4a is a top view and 4b is a view along line AA.

[0019] Figure 5 This is a top view of one embodiment of the oil-paper insulation structure of this utility model;

[0020] In the diagram: 1 is the equalizing ball, 2 is the first oil-paper insulation structure, 3 is the second oil-paper insulation structure, 4 is the third oil-paper insulation structure, 5 is the adjustment assembly mechanism, 6 is the first fixed support structure, 7 is the second fixed support structure, 8 is the first fixed wire clamp, 9 is the first supporting wire clamp, 10 is the adjusting plate, 11 is the second fixed wire clamp, 12 is the first insulating ring, 13 is the third fixed wire clamp, 14 is the second insulating ring, 15 is the third insulating ring, 16 is the first corner ring, 17 is the second corner ring, 18 is the supporting support bar, 19 is the second supporting wire clamp, 20 is the lower adjusting support bar, 21 is the upper adjusting support bar, 22 is the side wall of the valve side riser seat, 23 is the insulating cylinder, 24 is the insulating support bar, and 25 is the horizontal supporting support bar. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0022] like Figure 1 As shown, a combined valve-side outgoing line device for a ±800kV converter transformer is mainly composed of an 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 adjusting assembly mechanism 5, a fixed support structure 1 6, and a fixed support structure 2 7. The adjusting assembly mechanism 5, the fixed support structure 1 6, and the fixed support structure 2 7 are respectively arranged in four places on the inner circumference of the valve-side riser side wall 22.

[0023] The outer surface of the equalizing ball 1 is coated with sulfate pulp. A molded corner ring 16 is installed above the upper arc of the equalizing ball 1, and a matching molded corner ring 17 is installed around the outer periphery of the equalizing ball 1. The equalizing ball 1 is protected by the corner rings 16 and 17. The equalizing ball 1, corner ring 16, and corner ring 17 are all supported and fixed by pads (for the sake of simplicity in the design). Figure 1 (The pad is not shown in the diagram). The outer surfaces of corner ring 16 and corner ring 27 are coated with sulfate pulp. The sulfate pulp becomes solid after drying. The specific process of how to coat the sulfate pulp onto the outer surfaces of the equalizing ball 1, corner ring 16 and corner ring 27 is irrelevant to the embodiments of this utility model and will not be described here.

[0024] Oil-paper insulation in a transformer refers to an insulation system composed of insulating paper and insulating oil. The insulating paper is typically cellulose paper, possessing excellent electrical and mechanical insulation properties. The insulating oil is usually mineral oil or vegetable oil, such as the commonly used transformer oil. The insulating paper and insulating oil work together to form a complete insulation system. The insulating paper prevents current from flowing through, while the insulating oil fills the gaps in the paper, further enhancing the insulation effect. Simultaneously, the fluidity of the insulating oil prevents localized overheating and protects the insulating paper from high-temperature damage. During transformer operation, they work together to ensure the safe and stable operation of the transformer.

[0025] An oil-paper insulation structure 2 is fixedly installed between the outer periphery of corner ring 16 and corner ring 27 and the side wall 22 of the valve side riser seat. Figure 5As shown, the oil-paper insulation structure 2 includes several layers of insulating paper tubes 23. Eight vertically aligned insulating supports 24 are evenly distributed circumferentially between adjacent insulating tubes 23. Insulating oil is contained in the cavity between adjacent insulating tubes 23. The insulating supports 24 are bonded and fixed to the insulating tubes 23 on both sides, and are also fixed at the ends of the insulating supports 24 and insulating tubes 23 with rivets. The oil-paper insulation structure 2, together with corner rings 16 and 17, protects the equalizing ball 1 and the sleeve. The sleeve passes through the equalizing ball 1. The upper parts of the several insulating tubes 23 are of uniform height, and the lower parts of the several insulating tubes 23 form a stepped structure, with the outermost insulating tubes 23 being shorter. When the lower ends of the insulating supports 24 and insulating tubes 23 are fixed with rivets, the lower ends of the outermost insulating tubes 23 and outermost insulating supports 24 are used as the reference.

[0026] like Figure 2 As shown, the adjustment assembly mechanism 5 includes a second support wire clamp 19, a lower adjustment support bar 20, an upper adjustment support bar 21, a pair of side support bars 18, and a horizontal support bar 25. The second support wire clamp 19 and the horizontal support bar 25 are arc-shaped structures that cooperate with the side wall 22 of the valve-side riser seat. The second support wire clamp 19 is fixedly installed on the side wall 22 of the valve-side riser seat by an insulating screw. The horizontal support bar 25 is fixedly installed on the upper end of the second support wire clamp 19. The upper ends of the pair of side support bars 18 are fixedly connected to the side wall 22 of the valve-side riser seat by an insulating screw, and the lower ends of the side support bars 18 are fixedly connected to the horizontal support bar 25. The lower end of the lower adjusting support bar 20 is fixedly connected to the horizontal supporting support bar 25. The lower adjusting support bar 20 is located in the middle of a pair of side supporting support bars 18. The upper adjusting support bar 21 is interference-fitted with the outer wall of the outermost insulating cylinder 23 of the oil-paper insulation structure 2 to fix the oil-paper insulation structure 2. The lower end of the upper adjusting support bar 21 and the upper end of the lower adjusting support bar 20 are provided with mutually cooperating slopes. The upper adjusting support bar 21 and the lower adjusting support bar 20 overlap in the vertical direction. The oil-paper insulation structure 2 is fixed by the upper adjusting support bar 21 and the lower adjusting support bar 20 with slope cooperation, and the height and angle of the oil-paper insulation structure 2 can be easily adjusted by the slope.

[0027] The main structure of the second layer of the oil-paper insulation structure is basically the same as that of the first layer of the oil-paper insulation structure, except for the number of layers. The outermost layer of the second layer of the oil-paper insulation structure is an insulating support strip 24. The second layer of the oil-paper insulation structure and the first layer of the oil-paper insulation structure are fixed by riveting the paper tube support strips of the same layer in the circumferential direction. The upper end of the paper tube support strip of the first layer of the oil-paper insulation structure and the lower end of the paper tube support strip of the second layer of the oil-paper insulation structure are provided with a riveting structure that matches each other. During assembly, the lower end of the paper tube support strip of the second layer of the oil-paper insulation structure is inserted into the upper end of the paper tube support strip of the first layer of the oil-paper insulation structure, ensuring that a small amount of allowance is left on the inner and outer sides of each layer of the insulating support strip structure for assembly adjustment. The lower end of the insulating support strip of the second layer of the oil-paper insulation structure is stepped, and the shorter it is closer to the outer paper tube, which facilitates observation and adjustment of the insertion. The upper part of the outermost paper tube of the second layer of the oil-paper insulation structure is fixedly connected to the inner wall of the valve side riser side wall 22 by the fixed support structure 16 using insulating screws.

[0028] like Figure 3 As shown, the fixed support structure 6 includes a fixed wire clamp 8, a supporting wire clamp 9, an adjusting plate 10, a second fixed wire clamp 11, and an insulating ring 12. The wire clamp 8 is fixedly connected to the inner wall of the valve-side riser sidewall 22 using an insulating screw. The supporting wire clamp 9 is fixedly installed on the wire clamp 8 and is used to clamp the outermost insulating support strip of the second oil-paper insulation structure 3. An adjusting plate 10 is provided between the wire clamp 8 and the inner wall of the valve-side riser sidewall 22 to adjust the relative position of the supporting wire clamp 9 and the outermost paper tube of the second oil-paper insulation structure 3. The lower end of the second fixed wire clamp 11 is fixedly installed on the fixed wire clamp 8, and the outer side of the second fixed wire clamp 11 is fixed to the inner wall of the valve-side riser sidewall 22. A lifting groove is opened on the upper inner side of the second fixed wire clamp 11, and the insulating ring 12 is fixedly installed in the lifting groove.

[0029] The main structure of the oil-paper insulation structure 34 is basically the same as that of the oil-paper insulation structure 12, except for the number of layers. The outermost layer of the oil-paper insulation structure 34 is the insulating support strip 24. The oil-paper insulation structure 34 and the oil-paper insulation structure 23 are fixed by riveting the same layer of paper tube support strips in the circumferential direction. The insertion 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.

[0030] The outgoing cable device employs a paper insulation structure with varying numbers of layers and insulation lengths at different heights because, from a radial distribution perspective, the electric field strength is relatively high in the paper insulation section near the conductive rod. Since the conductive rod is the source of the electric field, the closer to the rod, the greater the electric field strength. The electric field strength gradually decreases with distance from the rod. During the design and manufacturing process, the length, thickness, and mass of the paper insulation structure are rationally arranged based on the distribution of the electric field strength.

[0031] like Figure 4As shown, the fixed support structure 2 7 includes a fixed wire clamp 3 13, which is a long strip plate with a boss on the inner side. The outer side of the fixed wire clamp 3 13 is assembled to the inner wall of the valve side riser side wall 22 by an insulating screw. A horizontal slot is opened on the inner boss of the fixed wire clamp 3 13. The slot is used to support the insulating ring 2 14 and the insulating ring 3 15. The outer side of the insulating ring 2 14 and the insulating ring 3 15 is fitted into the 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 side of the insulating ring 2 14 and the insulating ring 3 15 is in close contact with the outermost insulating support strip of the oil paper insulation structure 3 4. By adjusting the position 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 support strip and apply force to the insulating support strip.

[0032] The insulating cylinder 23 and the insulating support strip 24 are made of laminated paperboard.

[0033] This utility model provides a combined valve-side outlet device for a ±800kV converter transformer, comprising three independent oil-paper insulation structures, each assembled with a valve-side riser seat, improving assembly efficiency and economic efficiency. The three oil-paper insulation structures function independently while cooperating and integrating into a single unit, facilitating installation and resulting in a more stable overall structure. The increased number of insulation layers at support joints reduces the oil gap field strength, further enhancing the overall electrical and mechanical strength of the valve-side outlet device. Due to the high ±800kV voltage level, more insulation components are required for electrical insulation. Using a single-piece valve-side outlet device structure would result in greater weight and, due to space constraints, ineffective support in the middle position. This design employs three interlocking oil-paper insulation structures, each with its own fixing structure, effectively increasing the number of fixing points, thus making the assembled valve-side outlet device structure more stable.

[0034] In this embodiment of the utility model, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0035] 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 combined valve-side outgoing line device for a ±800kV converter transformer, comprising an equalizing sphere and an oil-paper insulation structure located on the outer periphery and above the equalizing sphere, characterized in that, The oil-paper insulation structure includes three oil-paper insulation structures: a first oil-paper insulation structure, a second oil-paper insulation structure, and a third oil-paper insulation structure, which are riveted and inserted from top to bottom. The first oil-paper insulation structure includes several layers of insulating cylinders. Several vertically aligned insulating support strips are evenly distributed in the circumferential direction between adjacent insulating cylinders. Insulating oil is contained in the cavity between adjacent insulating cylinders. The insulating support strips are bonded and fixed to the insulating cylinders on both sides, and are fixed with rivets at the ends of the insulating support strips and insulating cylinders. The outermost layer of the second and third oil-paper insulation structures is an insulating support strip. The first, second, and third oil-paper insulation structures are respectively fixedly connected to the side wall of the valve side riser seat through independent fixing mechanisms.

2. The ±800kV converter transformer combined valve-side outgoing line device according to claim 1, characterized in that, An angle ring one is installed above the upper arc of the equalizing sphere, and an angle ring two with a matching shape is installed on the outer periphery of the equalizing sphere.

3. The ±800kV converter transformer combined valve-side outgoing line device according to claim 2, characterized in that, An oil-paper insulation structure 1 is installed between the outer periphery of corner ring 1 and corner ring 2 and the side wall of the valve side riser seat.

4. The ±800kV converter transformer combined valve-side outgoing line device according to claim 3, characterized in that, Several vertical adjustment assembly mechanisms are evenly distributed between the oil-paper insulation structure and the side wall of the valve-side riser seat. Each adjustment assembly mechanism includes a second supporting wire clamp, a lower adjusting support bar, an upper adjusting support bar, a pair of side supporting support bars, and a horizontal supporting support bar. The second supporting wire clamp and the horizontal supporting support bar are arc structures that cooperate with the side wall of the valve-side riser seat. The second supporting wire clamp is installed on the side wall of the valve-side riser seat via an insulating screw. The horizontal supporting support bar is installed on the upper end of the second supporting wire clamp. The upper end of the side supporting support bar is fixedly connected to the side wall of the valve-side riser seat via an insulating screw. The lower end of the side supporting support bar is fixedly connected to the horizontal supporting support bar. The lower adjusting support bar is located in the middle of the pair of side supporting support bars. The lower end of the upper adjusting support bar and the upper end of the lower adjusting support bar are provided with mutually cooperating ramps.

5. A combined valve-side outgoing line device for a ±800kV converter transformer according to claim 1, characterized in that, Several vertical fixed support structures are evenly distributed between the second oil-paper insulation structure and the side wall of the valve-side riser seat. Each fixed support structure includes a first fixed wire clamp, a first supporting wire clamp, an adjusting plate, a second fixed wire clamp, and a first insulating ring. The first wire clamp is fixedly connected to the inner wall of the valve-side riser seat side wall by an insulating screw. The first supporting wire clamp is installed on the first wire clamp and clamps the outermost insulating support bar of the second oil-paper insulation structure. An adjusting plate is provided between the first wire clamp and the inner wall of the valve-side riser seat side wall. The lower end of the second fixed wire clamp is installed on the first fixed wire clamp, and the outer side of the second fixed wire clamp is fixed to the inner wall of the valve-side riser seat side wall. A lifting groove is opened on the upper inner side of the second fixed wire clamp, and the first insulating ring is installed in the lifting groove.

6. The ±800kV converter transformer combined valve-side outgoing line device according to claim 1, characterized in that, Several fixed support structures are evenly distributed between the oil-paper insulation structure three and the side wall of the valve-side riser seat. Each fixed support structure includes a fixed wire clamp three, which is a long strip plate with a boss on the inner side. The outer side of the fixed wire clamp three is assembled to the inner wall of the valve-side riser seat side wall by an insulating screw. A horizontal slot is opened on the inner boss of the fixed wire clamp three. The outer sides of the supporting insulating ring two and the insulating ring three are fitted into the slot. The insulating ring two and the insulating ring three are provided with screws, which are fixedly connected to the oil-paper insulation structure three. The inner sides of the insulating ring two and the insulating ring three are closely attached to the outermost insulating support strip of the oil-paper insulation structure three.

7. A combined valve-side outgoing line device for a ±800kV converter transformer according to any one of claims 1-6, characterized in that, The insulating cylinder and insulating support strip are made of laminated paperboard.

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