Converter valve with global distributed shielding structure and uniform electric field

Abstract

The invention discloses a converter valve with a global distributed shielding structure and a uniform electric field, and belongs to the technical field of converter valve structures. Comprising a converter valve body and a plurality of assemblies. A plurality of first shielding assemblies are uniformly arranged at the corner of the converter valve body along the width direction of a valve tower, a plurality of first voltage-sharing assemblies are uniformly arranged on the converter valve body along two side surfaces of the converter valve body along the length direction of the valve tower, and a plurality of second shielding assemblies are uniformly and symmetrically distributed at the top of the valve tower of the converter valve body. A plurality of third shielding assemblies are uniformly and symmetrically distributed on the converter valve body along the length direction of the valve tower, a plurality of fourth shielding assemblies are uniformly and symmetrically distributed at the joint of supporting insulators at the bottom of the valve tower on the converter valve body, and a plurality of second voltage-sharing assemblies are uniformly distributed on the supporting insulators at the bottom of the converter valve body. A global distributed shielding strategy is adopted, and components with specific shapes, sizes and potential relations are designed at different valve layers and different positions, so that global distributed shielding and electric field uniformity are realized.

Description

TECHNICAL FIELD

[0001] The application relates to a full-distributed shielding structure and a commutation valve with a uniform electric field, and belongs to the technical field of commutation valve structures. BACKGROUND

[0002] As a core device of high-voltage direct-current power transmission, the electromagnetic shielding and electric field homogenization design of the commutation valve are key technical requirements for realizing high-reliability operation. The commutation valve presents diversified topological configurations in engineering practice, and the electromagnetic shielding method needs to be designed correspondingly according to the structural characteristics of the valve body. With the increase of the transmission voltage level, higher requirements are put forward for the insulation margin and the complexity of the electromagnetic environment, which directly drives the iteration and upgrading of the shielding structure layout. From the conventional direct current to the extra-high voltage application scenario, the shielding structure needs to be dynamically adjusted according to the electric field distribution characteristics and the dielectric breakdown threshold of different voltage intervals, thereby forming a differentiated electromagnetic protection system design standard.

[0003] In the traditional high-voltage direct-current power transmission system, the electromagnetic shielding system of the commutation valve derives different configuration schemes according to the functional requirements, and the design core lies in the dual optimization of electric potential distribution regulation and electromagnetic coupling suppression. From the spatial layout dimension, the existing technical routes mainly present two types: integrated shielding architecture and distributed discrete shielding method. The integrated shielding architecture integrates the mechanical support frame of the valve module and the electromagnetic shielding function, and realizes unified potential reference through full-module potential binding; the distributed discrete shielding method is based on the multi-potential collaborative control concept, and sets up independent shielding units in the valve module, and each unit is connected to different potential nodes through an impedance matching network. Compared with the integrated shielding architecture, the distributed discrete shielding method can effectively alleviate the accumulation of space charges in the extra-high voltage scenario, and can provide physical partitioning for local discharge monitoring, facilitating fault positioning.

[0004] At present, the internal electric field distribution of the high-voltage direct-current commutation valve is extremely complex, especially between different potential valve tower layers, between elements in the layer, and around the connecting components, there are a large number of electric field concentration points. The existing shielding measures are mostly local shielding, which leads to: (1) The local electric field strength is too high, which may cause local discharge and accelerate the aging of the insulation material; (2) The shielding effect is uneven, which limits the improvement of the overall voltage level and power density of the commutation valve; (3) There are shielding dead angles and weak links, which threaten the long-term operation reliability of the commutation valve. SUMMARY

[0005] The purpose of the present application is to provide a full-distributed shielding structure and a commutation valve with a uniform electric field, which solves the problems of local discharge, uneven shielding effect, shielding dead angles and shielding weak links in the prior art.

[0006] To achieve the above object, the application is implemented by using the following technical scheme: The application provides a full-distributed shielding structure and a uniform electric field converter, which comprises a converter body, a first shielding assembly, a first voltage equalizing assembly, a second shielding assembly, a third shielding assembly, a fourth shielding assembly and a second voltage equalizing assembly arranged on the periphery of the converter body. The first shielding assembly is uniformly arranged at the corners of the converter body along the width direction of the valve tower, the first voltage equalizing assembly is uniformly arranged at the two sides of the converter body along the length direction of the valve tower, the second shielding assembly is uniformly and symmetrically distributed at the top of the valve tower of the converter body, the third shielding assembly is uniformly and symmetrically distributed at the length direction of the converter body, the fourth shielding assembly is uniformly and symmetrically distributed at the support insulator connecting part of the bottom of the valve tower of the converter body, and the second voltage equalizing assembly is uniformly distributed at the support insulator of the bottom of the converter body.

[0007] Further, the first shielding assembly is an angle shielding ring, and the angle shielding ring is prepared by the following method: The metal pipe material is welded into a ring structure, the welded joint is polished and ground, and the ring structure is bent to obtain an angle shielding ring. The diameter of the metal pipe material used for manufacturing the angle shielding ring is 100-250 mm, and in the process of bending the ring structure to obtain the angle shielding ring, the bending radius is 250-400 mm.

[0008] Further, the first voltage equalizing assembly is a side voltage equalizing ring, and the side voltage equalizing ring is a ring structure formed based on a metal pipe material, and the curvature radius of the ring structure is 250-400 mm. The diameter of the metal pipe material used for manufacturing the side voltage equalizing ring is 100-250 mm.

[0009] Further, the second shielding assembly is a top L-shaped tube mother, and the top L-shaped tube mother is an L-shaped structure formed based on a metal pipe material, and the bending radius of the bending part of the L-shaped structure is 250-500 mm. The diameter of the metal pipe material used for manufacturing the top L-shaped tube mother is 250-450 mm.

[0010] Further, the third shielding assembly is a top straight tube mother, and the top straight tube mother is a metal straight pipe, the diameter of the metal straight pipe is 200-450 mm, and the length of the metal straight pipe is the same as the length of the converter body.

[0011] Further, the fourth shielding assembly is a bottom L-shaped tube mother, and the bottom L-shaped tube mother is an L-shaped structure formed based on a metal pipe material, and the bending radius of the bending part of the L-shaped structure is 250-500 mm. The diameter of the metal pipe used for manufacturing the bottom L-shaped pipe bus is 200-450 mm.

[0012] Further, the second equalizing component is a bottom equalizing ring, the bottom equalizing ring is a circular ring structure formed based on the metal pipe, the curvature radius of the circular ring structure is 200-450 mm, and the rotation angle is 100-160°. The diameter of the metal pipe used for manufacturing the bottom equalizing ring is 100-300 mm.

[0013] Further, the third shielding component and the second shielding component are located in the same horizontal plane.

[0014] Further, the second equalizing component is uniformly and symmetrically distributed at the valve base flange connection between the support insulator and the converter valve body and at the flange connection between every two support insulators.

[0015] Further, the surfaces of the first shielding component, the first equalizing component, the second shielding component, the third shielding component, the fourth shielding component and the second equalizing component are subjected to polishing treatment or sand blasting treatment.

[0016] Compared with the prior art, the present application has the following beneficial effects: The converter valve with the global distributed shielding structure and the uniform electric field provided by the present application discards the single and isolated local shielding idea, adopts a global distributed shielding strategy, designs and arranges a series of shielding components and equalizing components with specific shapes, sizes and potential relationships at different valve layers and different positions, cooperatively guides and homogenizes the entire space electric field from the high-voltage end to the low-voltage end, and realizes the uniform distribution of the global electric field strength of the converter valve through the comprehensive and cooperative optimization of the shielding components and the equalizing components. Specifically, the second shielding component and the third shielding component constitute a high-voltage layer active equalizing shielding group, the core function of which is to actively generate a controllable and uniform initial electric field, suppress the electric field concentration from the high-voltage end, and lay a good foundation for the electric field distribution of the lower layer; the first shielding component and the first equalizing component constitute an interlayer transition shielding group, the potential of which is between the upper and lower layers, which is used to smooth the potential step between the two layers, suppress the vertical electric field concentration between the layers, and eliminate the electric field distortion caused by irregular-shaped components such as busbar connection terminals and water pipe joints; the fourth shielding component and the second equalizing component constitute a low-voltage layer and valve base insulator terminal shielding group, which shields the grounded valve base support insulator, prevents the sharp edges thereof from interfering with the surrounding electric field, and protects the insulator support from the electric field of other components.

[0017] In summary, the present application has the following beneficial effects: Globality: From high voltage end to low voltage end, from interlayer to intralayer, it realizes the electric field shielding and optimization in the whole space without dead angle; Synergy: Each shielding component does not work independently, but is designed as a system to shape the ideal electric field distribution together, achieving the effect of "1+1>2"; High reliability: Significantly reduces the maximum electric field strength, effectively suppresses partial discharge, prolongs the service life of the equipment, and improves the operation safety margin of the converter valve; Prospectiveness: Provides key insulation technology support for developing the next generation of converter valves with higher voltage level and higher power density; Reduce the electromagnetic radiation generated by the equipment to the external environment, realize the regulation of the valve tower global potential gradient and uniform electric field; High installation flexibility, can be installed in segments, and adapt to complex space layout. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure schematic diagram of a global distributed shielding structure and a uniform electric field converter valve provided by the embodiment of the present application; Figure 2 is a structure schematic diagram of an angle shielding ring provided by the embodiment of the present application; Figure 3 is a structure schematic diagram of a side grading ring provided by the embodiment of the present application; Figure 4 is a structure schematic diagram of a top L-shaped tube mother provided by the embodiment of the present application; Figure 5 is a structure schematic diagram of a top straight tube mother provided by the embodiment of the present application; Figure 6 is a structure schematic diagram of a bottom L-shaped tube mother provided by the embodiment of the present application; Figure 7 is a structure schematic diagram of a bottom grading ring provided by the embodiment of the present application.

[0019] In the figure: 1, angle shielding ring; 2, side grading ring; 3, top L-shaped tube mother; 4, top straight tube mother; 5, bottom L-shaped tube mother; 6, bottom grading ring. DETAILED DESCRIPTION

[0020] The present application will be further described below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0021] Embodiment 1

[0022] This embodiment provides a converter valve with a globally distributed shielding structure and a uniform electric field, including a converter valve body, and a first shielding component, a first equalizing component, a second shielding component, a third shielding component, a fourth shielding component, and a second equalizing component disposed around the converter valve body. Multiple first shielding components are evenly arranged on the valve body at the corners along the width direction of the valve tower. Multiple first pressure equalizing components are evenly arranged on the two sides along the length direction of the valve tower. Multiple second shielding components are evenly and symmetrically distributed on the top of the valve tower of the valve body. Multiple third shielding components are evenly and symmetrically distributed on the valve body along the length direction of the valve tower. Multiple fourth shielding components are evenly and symmetrically distributed at the connection of the support insulator at the bottom of the valve tower on the valve body. Multiple second pressure equalizing components are evenly distributed on the support insulator at the bottom of the valve body.

[0023] This invention abandons the single, isolated local shielding approach and adopts a global distributed shielding strategy. By designing and arranging a series of shielding components and pressure equalizing components with specific shapes, sizes and potential relationships at different valve layers and locations, these components are treated as an organic whole to synergistically guide and equalize the electric field throughout the entire space from the high-pressure end to the low-pressure end. Through comprehensive and synergistic optimization of the configuration of shielding components and pressure equalizing components, a uniform distribution of the electric field intensity throughout the converter valve is achieved. Specifically, the second and third shielding components constitute the high-voltage layer active voltage equalization shielding group. Its core function is to act as an electric field anchor point at the high-voltage end, actively generating a controllable and uniform initial electric field, suppressing the electric field concentration starting from the high-voltage end, and laying a good foundation for the electric field distribution of the lower layer. The first shielding component and the first voltage equalization component constitute the interlayer transition shielding group. Its potential is between the upper and lower layers, used to smooth the potential step between the two layers, suppress the electric field concentration in the vertical direction between the layers, and eliminate the electric field distortion caused by irregularly shaped components such as busbar connection terminals and water pipe joints. The fourth shielding component and the second voltage equalization component constitute the low-voltage layer and valve base bottom insulator terminal shielding group, which shields the grounded valve base support insulator, prevents its sharp edges from interfering with the surrounding electric field, and protects the insulator support from the electric field influence of other components.

[0024] Example 2

[0025] like Figure 1 As shown, this embodiment provides a converter valve with a fully distributed shielding structure and a uniform electric field, including a converter valve body, an angle shielding ring 1, a side equalizing ring 2, a top L-shaped tube 3, a top straight tube 4, a bottom L-shaped tube 5, and a bottom equalizing ring 6.

[0026] Each shielding component and pressure equalization component is located in a different valve layer of the converter valve body and is arranged around the valve section module, surrounding the four sides of the converter valve body.

[0027] The converter valve body comprises a plurality of valve towers, and the full-distributed shielding structure comprises a plurality of shielding components distributed in different valve layers and positions, which jointly form a complete shielding system.

[0028] The corner shielding ring 1 is arranged at the periphery of the converter valve, and a plurality of corner shielding rings are arranged at each corner along the width direction of the valve tower; the side grading ring 2 is arranged at the periphery of the converter valve, and a plurality of side grading rings are arranged in sequence and uniformly along the two sides in the length direction of the valve tower; the top L-shaped tube mother 3 is arranged at the periphery of the converter valve, and a plurality of top L-shaped tube mothers are uniformly and symmetrically distributed at the top of the valve tower to surround the valve tower; the top straight tube mother 4 is arranged at the periphery of the converter valve, and a plurality of top straight tube mothers are symmetrically arranged along the length direction of the valve tower; the bottom L-shaped tube mother 5 is arranged at the periphery of the converter valve, and a plurality of bottom L-shaped tube mothers are uniformly and symmetrically distributed at the bottom of the valve tower at the connection of the support insulator to surround the valve tower; and the bottom grading ring 6 is arranged at the flange of the support insulator connected at the bottom of the converter valve, and the full-distributed shielding plate and the full-distributed grading ring are comprehensively and cooperatively optimized to realize the uniform distribution of the electric field strength of the valve tower.

[0029] The full-distributed shielding strategy comprises a high-voltage layer active grading shielding ring group, an interlayer transition shielding component, and a low-voltage layer and valve base bottom insulator terminal shielding group.

[0030] The high-voltage layer active grading shielding ring group is installed above the highest potential valve layer and at a key connection point, and is composed of the top L-shaped tube mother 3 and the top straight tube mother 4. The core function of the high-voltage layer active grading shielding ring group is to serve as an “electric field anchor point” at the high-voltage end, to actively generate a controllable and uniform initial electric field through a large curvature radius, to suppress the electric field concentration starting from the high-voltage end, and to lay a good foundation for the electric field distribution of the lower layer.

[0031] The interlayer transition shielding component is installed at the support structure, water pipe and busbar connection between adjacent valve layers, and is composed of the corner shielding ring 1 and the side grading ring 2. The interlayer transition shielding component is installed outside the frame between two layers, and the potential thereof is between the upper and lower layers. The interlayer transition shielding component is used to smooth the potential step between the two layers, to suppress the electric field concentration in the vertical direction between the layers, and to eliminate the electric field distortion caused by the irregular-shaped components such as the busbar connection terminal and the water pipe joint.

[0032] The low-voltage layer and valve base bottom insulator terminal shielding group is installed below the lowest potential valve layer and at the valve tower grounding valve base support connection, and is composed of the bottom L-shaped tube mother 5 and the bottom grading ring 6. The low-voltage layer and valve base bottom insulator terminal shielding group shields the grounding valve base support insulator, prevents the sharp edge thereof from interfering with the surrounding electric field, and protects the insulator support from the electric field of other components.

[0033] As shown in Figure 2 The corner shielding ring 1 is welded from metal pipes, the pipe diameter of the metal pipes used is 100-250 mm, and the metal pipes are bent by 90 degrees after welding to form the corner shielding ring 1, and the bending radius is 250-400 mm.

[0034] AsFigure 3 As shown, the side grading ring 2 is welded by metal pipe material, the pipe diameter of which is 100-250 mm, and the curvature radius is 250-400 mm.

[0035] As shown, the top L-shaped pipe busbar 3 is welded by metal pipe material, the pipe diameter of which is 250-450 mm, and the bending radius of the L-shaped bending part is 250-500 mm. Figure 4 As shown, the top straight pipe busbar 4 is welded by metal pipe material, the pipe diameter of which is 200-450 mm, and the length of the top straight pipe busbar 4 is equivalent to the length of the converter valve body.

[0036] Figure 5 As shown, the bottom L-shaped pipe busbar 5 is welded by metal pipe material, the pipe diameter of which is 200-450 mm, and the bending radius of the L-shaped bending part is 250-500 mm.

[0037] As shown, the bottom grading ring 6 is welded by metal pipe material, the pipe diameter of which is 100-300 mm, and the curvature radius of the bottom grading ring 6 is 200-450 mm, and the rotating angle is 100-160°. Figure 6 As shown, each component includes a circular arc chamfered metal shell and a rib plate force bearing structure, wherein the rib plate force bearing structure is welded by metal plate material to form a multi-layer electromagnetic shielding system with the metal shell. The design realizes the balanced distribution of electric field through the gradient conductive structure, while ensuring the structural rigidity and process feasibility. The rib plate force bearing structure is provided with a waist hole for facilitating the connection with the valve segment frame.

[0038] Figure 7 As shown, the outer surface of the corner shielding ring 1, the side grading ring 2, the top L-shaped pipe busbar 3, the top straight pipe busbar 4, the bottom L-shaped pipe busbar 5 and the bottom grading ring 6 can be subjected to polishing treatment or sandblasting treatment, and the welding joint needs to be polished and ground to reduce sharpness.

[0039] The corner shielding ring 1, the side grading ring 2 and the converter valve segment module correspond to each other; the top L-shaped pipe busbar 3, the top straight pipe busbar 4 and the bottom L-shaped pipe busbar 5 correspond to the overall structure of the converter valve; and the bottom grading ring 6 corresponds to the flange structure of the bottom support insulator. Figures 2 to 7 As shown, each component includes a circular arc chamfered metal shell and a rib plate force bearing structure, wherein the rib plate force bearing structure is welded by metal plate material to form a multi-layer electromagnetic shielding system with the metal shell. The design realizes the balanced distribution of electric field through the gradient conductive structure, while ensuring the structural rigidity and process feasibility. The rib plate force bearing structure is provided with a waist hole for facilitating the connection with the valve segment frame.

[0040] As shown, the outer surface of the corner shielding ring 1, the side grading ring 2, the top L-shaped pipe busbar 3, the top straight pipe busbar 4, the bottom L-shaped pipe busbar 5 and the bottom grading ring 6 can be subjected to polishing treatment or sandblasting treatment, and the welding joint needs to be polished and ground to reduce sharpness.

[0041] The corner shielding ring 1, the side grading ring 2 and the converter valve segment module correspond to each other; the top L-shaped pipe busbar 3, the top straight pipe busbar 4 and the bottom L-shaped pipe busbar 5 correspond to the overall structure of the converter valve; and the bottom grading ring 6 corresponds to the flange structure of the bottom support insulator.

[0042] ​​The shielding of the valve segment module includes two structural types, i.e., an angle shielding ring 1 and a side equalizing ring 2, the size of the side equalizing ring 2 is slightly smaller, and the size of the angle shielding ring 1 is larger; the angle shielding ring 1 is placed at the periphery of the converter valve, and a plurality of angle shielding rings 1 are arranged at the corners along the width direction of the valve tower; the side equalizing ring 2 is placed at the periphery of the converter valve, and a plurality of side equalizing rings 2 are arranged in sequence and uniformly along the two sides in the length direction of the valve tower; the two shielding structures are distributed at the periphery of the valve segment module of different valve layers of the converter valve, and surround the four surfaces of the valve module of the converter valve.

[0043] In terms of uniform electric field, the potentials of the plurality of angle shielding rings 1 and the plurality of side equalizing rings 2 are fixed at different point potential points of the valve segment module sub-module level to uniform the electric field of the valve tower and facilitate fault positioning; the angle shielding ring 1 and the side equalizing ring 2 are both designed with a rib bearing structure, which is connected with a fixing plate to fix the angle shielding ring 1 and the side equalizing ring 2 on the frame of the valve segment module.

[0044] In the manufacturing process of the shielding structure of the high-voltage electrical equipment, the angle shielding ring 1 and the side equalizing ring 2 adopt the same manufacturing process system, which is embodied in that the metal pipe material is bent to form a technical core, and the key parameters (including the cross-sectional diameter of the pipe material and the bending curvature radius) strictly follow the voltage level adaptation principle. After the pipe material is processed into a preset configuration by a precision bending equipment, the process opening area formed in the middle of the component needs to be laser welded with a homogeneous metal plate for reinforcement, and finally a composite shielding structure with continuous conductive curved surface characteristics is formed. This process route meets the dual index requirements of electromagnetic shielding efficiency and mechanical strength. From the appearance, the final angle shielding ring 1 and the side equalizing ring 2 are both a relatively closed structure.

[0045] The top L-shaped pipe mother 3 and the bottom L-shaped pipe mother 5 connected to the converter valve body have relatively large structural sizes and similar structures, the curvature radii of the outer surfaces of the two are consistent, and only the internal structures are different due to different installation and fixation.

[0046] The bottom equalizing ring 6 of the converter valve has a relatively small structural size, and two circular rings with a curvature radius of 200-450 mm and a rotation angle of 100-160° are symmetrically distributed at the bottom support insulator connection flange to surround the metal connection of the insulator.

[0047] Corresponding to the structural features of the converter valve, the converter valve full-distributed shielding structure is distributed as follows: a plurality of bottom L-shaped tube bases 5 are arranged at the bottom of the converter valve, a plurality of L-shaped tube bases 3 are arranged at the top, and a plurality of top straight tube bases 4 are arranged at the top; a plurality of valve layers are arranged above the bottom L-shaped tube bases 5, each layer has a plurality of valve segment modules, the valve modules are oppositely arranged, and all the corner shielding rings 1 and the side voltage-sharing rings 2 are located outside the valve layers. The outer surfaces of the corner shielding rings 1, the side voltage-sharing rings 2, the top L-shaped tube bases 3, the top straight tube bases 4, the bottom L-shaped tube bases 5 and the bottom voltage-sharing rings 6 can be subjected to polishing treatment or sand blasting treatment, and the welding joint needs to be polished and polished to reduce sharpness.

[0048] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A converter valve with a globally distributed shielding structure and a uniform electric field, characterized in that, It includes a converter valve body, and a first shielding component, a first pressure equalization component, a second shielding component, a third shielding component, a fourth shielding component, and a second pressure equalization component disposed around the converter valve body. Multiple first shielding components are evenly arranged on the valve body at the corners along the width direction of the valve tower. Multiple first pressure equalizing components are evenly arranged on the two sides along the length direction of the valve tower. Multiple second shielding components are evenly and symmetrically distributed on the top of the valve tower of the valve body. Multiple third shielding components are evenly and symmetrically distributed on the valve body along the length direction of the valve tower. Multiple fourth shielding components are evenly and symmetrically distributed at the connection of the support insulator at the bottom of the valve tower on the valve body. Multiple second pressure equalizing components are evenly distributed on the support insulator at the bottom of the valve body.

2. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The first shielding component is a corner shielding ring, which is manufactured by the following method: Metal pipes are welded into a ring structure, the weld joints are polished and ground, and the ring structure is bent to obtain an angle shielding ring. The diameter of the metal tube used to make the corner shielding ring is 100~250mm, and the bending radius is 250~400mm during the process of bending the ring structure to obtain the corner shielding ring.

3. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The first pressure equalization component is a side pressure equalization ring, which is a ring structure formed based on a metal tube, and the radius of curvature of the ring structure is 250~400mm; The diameter of the metal tubing used to make the side equalization ring is 100~250mm.

4. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The second shielding component is a top L-shaped tube, which is an L-shaped structure formed based on a metal tube, and the bending radius of the bend in the L-shaped structure is 250~500mm; The diameter of the metal tubing used to make the top L-shaped nut is 250~450mm.

5. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The third shielding component is a top straight tube, which is a metal straight tube with a diameter of 200~450mm and a length that is the same as the length of the converter valve body.

6. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The fourth shielding component is a bottom L-shaped tube, which is an L-shaped structure formed based on metal tubing, and the bending radius of the bend in the L-shaped structure is 250~500mm. The diameter of the metal tubing used to make the bottom L-shaped tube nut is 200~450mm.

7. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The second pressure equalization component is a bottom pressure equalization ring, which is a circular structure formed based on a metal tube. The radius of curvature of the circular structure is 200~450mm, and the rotation angle is 100~160°. The diameter of the metal tubing used to make the bottom equalizing ring is 100~300mm.

8. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The third shielding component and the second shielding component are located on the same horizontal plane.

9. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The second equalizing components are evenly and symmetrically distributed at the valve base flange connection between the supporting insulator and the converter valve body, as well as at the flange connection between every two supporting insulators.

10. The converter valve with a globally distributed shielding structure and a uniform electric field according to claim 1, characterized in that, The surfaces of the first shielding component, the first equalizing component, the second shielding component, the third shielding component, the fourth shielding component, and the second equalizing component are all polished or sandblasted.

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