Direct-current tubular busbar shielding and leading arrangement structure suitable for super-altitude extra-high voltage converter station
By optimizing the layout of poleline electrical equipment using shielded equalizing rings and pre-bent conductor assemblies in ultra-high voltage converter stations, the corona problem in ultra-high altitude areas was solved, the electric field strength and mechanical load were optimized, and the stability and safety of the equipment were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-10
AI Technical Summary
In ultra-high altitude areas, the DC bus equipment of UHV converter stations is prone to corona discharge. Conventional connection schemes are difficult to meet the requirements of electric field strength and mechanical load, resulting in construction difficulties and unstable equipment operation.
The structure adopts an integrated shielding equalizing ring, conduit clamp, pre-bent conductor assembly and conduit hardware base to optimize the layout of pole electrical equipment. The electric field strength is reduced by the shielding equalizing ring and pre-bent conductor, thereby reducing the mechanical load on the equipment.
It effectively reduces electric field strength, saves space, improves equipment stability and safety, and adapts to the electrical equipment connection requirements of ultra-high altitude environments.
Smart Images
Figure CN224110841U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of extra -high voltage converter station more specifically is related to a kind of extra -high voltage converter station DC pipe mother shielding lead arrangement structure suitable for super-elevation. BACKGROUND
[0002] With the large development of clean new energy in the southwest region, the converter station site of extra-high voltage DC transmission project will be located in the super-elevation area above 3000m. Extra-high voltage DC adopts ±800kV voltage level, and in the super-elevation area, the corona onset field strength of fittings and conductors will be greatly reduced due to the thin air. The connection conductors and fittings of ±800kV DC equipment are more prone to corona than in plain areas, and the electric field strength of the connection conductors and fittings needs to be strictly controlled.
[0003] The conductor connection of ±800kV extra-high voltage converter station DC field is mostly adopted by pipe mother, and multi-bundle conductors are also adopted in some positions. In the plain area, the connection of ±800kV extra-high voltage converter station DC pipe mother branch circuit equipment (taking voltage measurement device as an example) is mostly adopted by 6-bundle conductor lateral connection. An integrated pipe bus equipment clamp is arranged at the corresponding position of the pipe bus, the 6-bundle conductor is fixed in the clamp line pipe, and the clamp line pipe is fixed on the pipe bus by hoop or welding. In order to adapt to the electric field requirement of the connection fittings between the 800kV pole line pipe mother and the connection equipment, a certain height difference is often designed between the terminals of the 800kV pole line pipe mother and the connection equipment, and the 6-bundle conductor is smoothly pre-bent to connect.
[0004] With the increase of the site elevation, the diameter of the pole line pipe mother of ±800kV extra-high voltage converter station is required to be larger, the number of bundle of the bundle conductor is required to be more, and the outer diameter of the conductor and the diameter of the bundle circle are required to be larger. In the super-elevation area above 3000m, when the surface electric field design of the conventional pipe mother equipment clamp and the bundle conductor clamp is unreasonable, corona phenomenon is prone to occur, and a shielding ring needs to be additionally designed. At 3000m elevation, 800kV pole line connection adopts 8-bundle single conductor with outer diameter of 51mm, with the increase of the elevation, the number and outer diameter of the bundle conductor are required to be increased, which brings certain difficulty to the pre-bent conductor connection construction, and brings greater terminal force to the connection equipment (such as DC voltage measurement device). In addition, in the elevation above 3000m, the air clearance requirement of 800kV DC electrical equipment is larger, and the distance requirement of the surrounding electrical equipment is also increased by the lateral arrangement of the conventional branch circuit equipment. Therefore, the conventional 800kV pole line pipe mother branch circuit pre-bent conductor connection scheme is difficult to adapt to the super-elevation environment above 3000m. UTILITY MODEL CONTENTS
[0005] The utility model discloses a purpose at: in order to solve above -mentioned technical problem, the utility model provides a kind of arrangement structure of shielding connection suitable for super-elevation of extra-high voltage converter station DC pipe busbar.It is a kind of shielding type connection hardware structure of 800kV polar line pipe busbar of extra-high voltage converter station DC in the environment of 3000m above super-high altitude.
[0006] The utility model discloses in order to realize above-mentioned purpose specifically uses following technical scheme:
[0007] The utility model provides a kind of arrangement structure of shielding connection suitable for super-elevation of extra-high voltage converter station DC pipe busbar, including the pipe busbar hoop clamp of being set on DC polar line pipe busbar, the pipe busbar hardware base being fixed in the bottom of pipe busbar hoop clamp, the shielding grading ring subassembly being connected in pipe busbar hardware base, the pre-bending conductor subassembly being connected in the bottom of pipe busbar hardware base and the polar line electrical equipment installation subassembly being set in the bottom of pre-bending conductor subassembly.
[0008] Specifically, integrated shielding grading ring, pipe busbar hoop clamp, pre-bending conductor subassembly and pipe busbar hardware base are used, meet the voltage, shielding, current-carrying, mechanical requirements of polar line equipment connection under super-high altitude condition.Polar line electrical equipment (such as voltage measuring device) is arranged below polar line pipe busbar, and it is suitable to be located in the intermediate position of two 800kV polar line support insulators.Optimizes the size of land occupied, reduces the live distance requirement to surrounding equipment.
[0009] In an embodiment, the shielding grading ring subassembly includes an upper shielding grading ring disposed above the DC polar line pipe busbar and a lower shielding grading ring disposed below the DC polar line pipe busbar, and the upper shielding grading ring and the lower shielding grading ring are installed on the pipe busbar hardware base by the mounting bracket.
[0010] Specifically, the shielding grading ring (upper shielding grading ring and lower shielding grading ring) is arranged above and below the pipe busbar hoop clamp, and the outer diameter, pipe diameter and height difference (H1) of the upper shielding grading ring and the lower shielding grading ring are determined by specific electric field analysis.
[0011] In an embodiment, the mounting bracket includes an upper horizontal bracket for mounting the upper shielding grading ring, a lower horizontal bracket for mounting the lower shielding grading ring, a vertical bracket connected between the upper horizontal bracket and the lower horizontal bracket, and an inclined bracket connected between the pipe busbar hardware base and the upper horizontal bracket.
[0012] In an embodiment, the inclined bracket is installed on the pipe busbar hardware base by bolts, and the top of the inclined bracket is fixed on the upper horizontal bracket by bolts.
[0013] In an embodiment, the upper horizontal bracket is connected to the inner side of the upper shielding grading ring by welding, and the lower horizontal bracket is connected to the inner side of the lower shielding grading ring by welding.
[0014] In one embodiment, the upper horizontal support upper end is fixed to the top of the vertical support by bolts, and the lower end of the vertical support is fixed to the lower horizontal support by bolts.
[0015] Specifically, the inclined support is installed on the pipe clamp hardware base by bolts, and the top of the inclined support is connected and fixed to the upper horizontal support by bolts. The upper horizontal support is fixed to the inner side of the upper shielding grading ring by welding process. At the same time, the vertical support is fixed to the upper horizontal support by bolts, and the vertical support is used to fix the lower shielding grading ring. The lower shielding grading ring is also provided with a lower horizontal support, and the lower horizontal support is fixed to the inner side of the lower shielding grading ring by welding process. The lower end of the vertical support is fixed to the lower horizontal support by bolts. Thus, the mounting bracket is formed.
[0016] In one embodiment, the pipe clamp clamp is fixed to the DC polar line pipe clamp by through bolts, and the pipe clamp clamp includes a first half clamp and a second half clamp. The first half clamp or the second half clamp is in communication with the pipe clamp hardware base to form a conductive loop.
[0017] Specifically, the pipe clamp clamp is fixed to the DC polar line pipe clamp by through bolts, and the pipe clamp clamp is composed of two parts (a first half clamp and a second half clamp). One half of the pipe clamp clamp is in communication with the pipe clamp hardware base to form a conductive loop. Thus, the pipe clamp clamp conductive structure is formed.
[0018] In one embodiment, the pre-bent conductor assembly includes a plurality of pre-bent conductors evenly distributed at the bottom of the pipe clamp hardware base. The bottom of the pipe clamp hardware base is connected to a plurality of upper L-shaped conductor clamps in the form of bolts. The number of pre-bent conductors is the same as the number of upper L-shaped conductor clamps. The top of each pre-bent conductor is integrally formed with the corresponding upper L-shaped conductor clamp. The bottom of each pre-bent conductor is connected to the polar line electrical equipment mounting assembly.
[0019] In one embodiment, the polar line electrical equipment mounting assembly includes an equipment clamp bottom plate and a plurality of lower L-shaped conductor clamps arranged on the equipment clamp bottom plate. The bottom of each pre-bent conductor is integrally formed with the corresponding lower L-shaped conductor clamp.
[0020] Specifically, the height difference (H2) between the lower shielding grading ring and the electrical equipment grading ring is also determined by specific electric field analysis. The pre-bent conductors are used to realize the current conduction between the DC polar line pipe clamp and the connected equipment, while providing a certain degree of freedom of seismic displacement. The number of pre-bent conductors is determined by the current-carrying capacity of the specific connected equipment. The upper and lower ends of the pre-bent conductors are integrally extruded and crimped with the upper L-shaped conductor clamp. The upper L-shaped conductor clamp is fixed to the lower surface of the pipe clamp hardware base by bolts. The lower L-shaped conductor clamp is fixed to the upper surface of the equipment clamp bottom plate by bolts. Thus, the main current conduction structure of the hardware and equipment connection is formed.
[0021] In one embodiment, a device terminal plate is arranged below the device clamp bottom plate.
[0022] Specifically, the device terminal plate is arranged at the lower part of the device clamp bottom plate and is fixed to the device clamp bottom plate through a welding process.
[0023] The utility model discloses the beneficial effects are as follows:
[0024] 1) save the place of polar line area arrangement. The conventional direct current polar line branch connection arrangement scheme is arranged in the lateral position of the two support insulators of the polar line pipe bus, and the distance between the electrical equipment and the polar line pipe bus can be up to 4m horizontally due to the need of the bending radius of the multi-bundle conductor. However, the electrical equipment of the branch connection can be placed between the two support insulators of the polar line pipe bus by adopting the technical scheme, thereby saving the lateral position of the polar line pipe bus. Considering the live safety distance requirement of the polar line electrical equipment to the surrounding facilities, the effect of saving the site is more obvious.
[0025] 2) optimize the surface electric field of the lead-in structure, so that it can adapt to the electric field control requirement of the DC polar line lead-in structure of the extra-high voltage converter station at an altitude of more than 3000m. The conventional multi-bundle conductor branch connection arrangement scheme needs to use at least 8 sub-conductors with an outer diameter of 51mm and a split conductor with a split circle diameter of 450mm to meet the requirement of the surface electric field of the conductor at an altitude of 3000m. With the further increase of the altitude (there is a demand for the construction of the extra-high voltage converter station at an altitude of 4500m), the number of split conductors needs to be further increased, the outer diameter of the sub-conductor needs to be further increased, and the pre-bending connection process requirement also needs to be greatly increased. Any bending and strand of the surface of the sub-conductor will cause the corona of the connected conductor, thereby affecting the safe and reliable operation of the DC field. However, after adopting the structure, the conductor part of the whole shielding lead-in structure will be in the shielding range of the upper and lower shielding grading rings and the equipment grading ring, the surface electric field requirement of the conductor of the lead-in structure is greatly reduced, and the electric field on the surface of the grading ring is smaller than that on the surface of the split conductor, and has a better electric field environment.
[0026] 3) Reduce the load requirements of the connection conductor to the terminal of the leading device. The conventional multi-split conductor branch connection arrangement scheme is used, and at least 8 sub-conductors are required for the connection of the extra-high voltage converter station pole line branch in the area above an altitude of 3000m. The load of the sub-conductor is mostly concentrated on the terminal plate of the connection device, which is not conducive to the stress of the electrical device terminal, and may exceed the allowable stress range of the device terminal plate. After using the structure, the load of the whole pipe bus shielding leading structure is mostly concentrated on the DC pole line pipe bus post insulator, and the post insulator can bear a larger load than other electrical devices (such as DC voltage measurement device), and the relatively small leading conductor load is applied to the electrical device connection terminal, which reduces the load of the electrical device connection terminal and is beneficial to improve the safety and stability of the operation of the electrical device. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0028] Figure 1 is a structural schematic diagram of the present application;
[0029] Figure 2 is Figure 1 a side view of
[0030] Figure 3 is Figure 1 a top view of
[0031] Figure 4 is a use schematic diagram of the present application;
[0032] Figure 5 is Figure 4 a top view of
[0033] The drawings show: 1, upper shielding grading ring; 2, DC pole line pipe bus; 3, pipe bus fitting base; 4, lower shielding grading ring; 5, pre-bent conductor; 6, connection device terminal plate; 7, device wire clamp bottom plate; 8, lower horizontal support; 9, vertical support; 10, inclined support; 11, upper horizontal support; 12, pipe bus hoop clamp. DETAILED DESCRIPTION
[0034] To make the technical problems, technical solutions, and technical effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0036] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0037] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0038] Example 1
[0039] like Figures 1 to 5 As shown in the figure, this embodiment provides a DC bus shielding connection arrangement structure suitable for ultra-high altitude converter stations, including a bus clamp 12 sleeved on the DC pole bus 2, a bus hardware base 3 fixed to the bottom of the bus clamp 12, a shielding equalizing ring assembly connected to the bus hardware base 3, a pre-bent conductor 5 assembly connected to the bottom of the bus hardware base 3, and a pole electrical equipment installation assembly set at the bottom of the pre-bent conductor 5 assembly.
[0040] Specifically, the integrated shielding grading ring, the tube bus clamp 12, the pre-bent conductor 5 assembly and the tube bus fitting base 3 meet the requirements of grading, shielding, current carrying and mechanical requirements of the polar line equipment connection under the condition of ultra-high altitude. The polar line electrical equipment (such as a voltage measurement device) is arranged below the polar line tube bus and is preferably located at the middle position of the two 800kV polar line support insulators. The land size is optimized, and the live distance requirement for the surrounding equipment is reduced.
[0041] Embodiment 2
[0042] As Figures 1 to 5 shown, the embodiment provides a UHV converter station DC tube bus shielding lead arrangement structure suitable for ultra-altitude, which comprises a tube bus clamp 12 sleeved on a DC polar line tube bus 2, a tube bus fitting base 3 fixed at the bottom of the tube bus clamp 12, a shielding grading ring assembly connected to the tube bus fitting base 3, a pre-bent conductor 5 assembly connected to the bottom of the tube bus fitting base 3, and a polar line electrical equipment mounting assembly arranged at the bottom of the pre-bent conductor 5 assembly.
[0043] The shielding grading ring assembly comprises an upper shielding grading ring 1 arranged above the DC polar line tube bus 2 and a lower shielding grading ring 4 arranged below the DC polar line tube bus 2. The upper shielding grading ring 1 and the lower shielding grading ring 4 are installed on the tube bus fitting base 3 through mounting brackets.
[0044] Specifically, the shielding grading rings (the upper shielding grading ring 1 and the lower shielding grading ring 4) are arranged above and below the tube bus clamp 12. The outer diameter, tube diameter and height difference (H1) of the upper shielding grading ring 1 and the lower shielding grading ring 4 are determined by specific electric field analysis.
[0045] Embodiment 3
[0046] This embodiment is further optimized on the basis of embodiment 2, specifically:
[0047] The mounting bracket comprises an upper horizontal bracket 11 for mounting the upper shielding grading ring 1, a lower horizontal bracket 8 for mounting the lower shielding grading ring 4, a vertical bracket 9 connected between the upper horizontal bracket 11 and the lower horizontal bracket 8, and an inclined bracket 10 connected between the tube bus fitting base 3 and the upper horizontal bracket 11.
[0048] The inclined bracket 10 is installed on the tube bus fitting base 3 through bolts, and the top of the inclined bracket 10 is fixed on the upper horizontal bracket 11 through bolts.
[0049] The upper horizontal bracket 11 and the inner side of the upper shielding grading ring 1 are connected by welding, and the lower horizontal bracket 8 and the inner side of the lower shielding grading ring 4 are connected by welding.
[0050] The upper horizontal support 11 is fixed at the top of the vertical support 9 by bolts, and the lower end of the vertical support 9 is fixed with the lower horizontal support by bolts.
[0051] Specifically, the inclined support 10 is installed on the tube clamp base 3 by bolts, and the top of the inclined support 10 is fixed by bolts to connect the upper horizontal support 11. The upper horizontal support 11 is fixed to the inner side of the upper shielding grading ring 1 by welding process. At the same time, the vertical support 9 is fixed on the upper horizontal support 11 by bolts, and the vertical support 9 is used to fix the lower shielding grading ring 4. The lower shielding grading ring 4 is also provided with a lower horizontal support 8, and the lower horizontal support 8 is fixed to the inner side of the lower shielding grading ring 4 by welding process. The lower end of the vertical support 9 is fixed with the lower horizontal support by bolts. Thus, the mounting bracket is formed.
[0052] Embodiment 4
[0053] This embodiment is further optimized on the basis of embodiment 2 or embodiment 3, specifically:
[0054] The tube clamp hoop clamp 12 is fixed on the DC polar line tube clamp 2 by through bolts, and the tube clamp hoop clamp 12 includes a first half hoop and a second half hoop, and the first half hoop or the second half hoop is in communication with the tube clamp fitting base 3 to form a conductive loop.
[0055] Specifically, the tube clamp hoop clamp 12 is fixed on the DC polar line tube clamp 2 by through bolts, and the tube clamp hoop clamp 12 is composed of two parts (a first half hoop and a second half hoop), one half of the tube clamp hoop clamp 12 is in communication with the tube clamp fitting base 3 to form a conductive loop. Thus, the conductive structure of the tube clamp hoop clamp 12 is formed.
[0056] Embodiment 5
[0057] This embodiment is further optimized on the basis of embodiment 4, specifically:
[0058] The pre-bent conductor 5 assembly includes a plurality of pre-bent conductors 5 distributed in the tube clamp fitting base 3 at the bottom in a circumferential direction, and the tube clamp fitting base 3 is connected with a plurality of upper L-shaped conductor clamps at the bottom by bolts. The number of pre-bent conductors 5 is the same as the number of upper L-shaped conductor clamps, the top of each pre-bent conductor 5 is integrally formed with the corresponding upper L-shaped conductor clamp, and the bottom of each pre-bent conductor 5 is connected with a polar line electrical equipment mounting assembly.
[0059] The polar line electrical equipment mounting assembly includes a device clamp bottom plate 7 and a plurality of lower L-shaped conductor clamps arranged on the device clamp bottom plate 7, and the bottom of each pre-bent conductor 5 is integrally formed with the corresponding lower L-shaped conductor clamp.
[0060] Specifically, the height difference (H2) between the lower shielding grading ring 4 and the grading ring of the electrical equipment is also determined by specific electric field analysis. The pre-bent conductor is used to realize the connection between the DC polar line tube bus 2 and the current lead of the equipment, and at the same time, it provides a certain degree of freedom of seismic displacement. The number of pre-bent conductors 5 is determined by the current-carrying capacity of the specific connected equipment. The upper and lower ends of the pre-bent conductor 5 are integrally extruded and crimped with L-shaped conductor clamps. The upper L-shaped conductor clamp is fixed to the lower surface of the tube bus fitting base 3 by bolt connection, and the lower L-shaped conductor clamp is fixed to the upper surface of the equipment clamp bottom plate by bolt connection. Thus, the main structure of the current lead of the fitting and the equipment is formed.
[0061] Example 6
[0062] This embodiment is further optimized on the basis of Example 4, specifically:
[0063] The equipment clamp bottom plate 7 is provided below with a connection equipment terminal plate 6.
[0064] Specifically, the equipment clamp bottom plate is provided with an equipment terminal plate at the lower part, which is fixed to the equipment clamp bottom plate by welding process. The size of the equipment clamp terminal plate is matched with the connected electrical equipment, and the overall electrical connection is completed through the connection equipment terminal plate 6.
Claims
1. A DC pipe busbar lead-in arrangement structure suitable for extra-high voltage converter stations at ultra-elevations, characterized in that, The application relates to a DC polar line bushing clamp (12) sleeved on a DC polar line bushing (2), a bushing fitting base (3) fixed at the bottom of the bushing clamp (12), a shielding equalizing ring assembly connected to the bushing fitting base (3), a pre-bent conductor (5) assembly connected to the bottom of the bushing fitting base (3), and a polar line electrical equipment mounting assembly arranged at the bottom of the pre-bent conductor (5) assembly.
2. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 1, characterized in that, The shielding equalizing ring assembly comprises an upper shielding equalizing ring (1) arranged above the DC polar line bushing (2) and a lower shielding equalizing ring (4) arranged below the DC polar line bushing (2), and the upper shielding equalizing ring (1) and the lower shielding equalizing ring (4) are installed on the bushing fitting base (3) through mounting supports.
3. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 2, characterized in that, The mounting supports comprise an upper horizontal support (11) for installing the upper shielding equalizing ring (1), a lower horizontal support (8) for installing the lower shielding equalizing ring (4), a vertical support (9) connected between the upper horizontal support (11) and the lower horizontal support (8), and an inclined support (10) connected between the bushing fitting base (3) and the upper horizontal support (11).
4. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 3, characterized in that, The inclined support (10) is bolted on the bushing fitting base (3), and the top of the inclined support (10) is bolted and fixed on the upper horizontal support (11).
5. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 3, characterized in that, The upper horizontal support (11) is connected with the inner side of the upper shielding equalizing ring (1) through welding, and the lower horizontal support (8) is connected with the inner side of the lower shielding equalizing ring (4) through welding.
6. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 3, characterized in that, The upper end of the upper horizontal support (11) is bolted on the top of the vertical support (9), and the lower end of the vertical support (9) is bolted with the lower horizontal support.
7. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 1, characterized in that, The bushing clamp (12) is fixed on the DC polar line bushing (2) through through-bolts, and the bushing clamp (12) comprises a first half clamp and a second half clamp, and the first half clamp or the second half clamp is communicated with the bushing fitting base (3) to form a conductive loop.
8. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 1, characterized in that, The pre-bent conductor (5) assembly comprises a plurality of pre-bent conductors (5) circumferentially and uniformly arranged at the bottom of the bushing fitting base (3), the bottom of the bushing fitting base (3) is connected with a plurality of upper L-shaped conductor clamps in the form of bolts, the number of the pre-bent conductors (5) is the same as that of the upper L-shaped conductor clamps, the top of each pre-bent conductor (5) is integrally formed with the corresponding upper L-shaped conductor clamp, and the bottom of each pre-bent conductor (5) is connected with the polar line electrical equipment mounting assembly.
9. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 8, characterized in that, The polar line electrical equipment mounting assembly comprises an equipment clamp bottom plate (7) and a plurality of lower L-shaped conductor clamps arranged on the equipment clamp bottom plate (7), and the bottom of each pre-bent conductor (5) is integrally formed with the corresponding lower L-shaped conductor clamp.
10. The DC pipe busbar lead-in arrangement structure suitable for EHV converter station at ultra-elevation according to claim 9, characterized in that, A connecting equipment terminal plate (6) is arranged below the equipment clamp bottom plate (7).