1000kV high-voltage reactance terminal and tubular busbar connection fitting for high-altitude and high-earthquake area

Abstract

The invention discloses a 1000kV high-resistance terminal and tubular bus connection fitting for a high-altitude and high-earthquake area, and relates to the technical field of power transmission and transformation engineering. The connection fitting comprises a fitting body with a displacement compensation structure, the lower end of the fitting body penetrates through a grading ring at the top of the reactor and is connected with an outgoing line terminal of the reactor through an equipment terminal, the upper end of the fitting body is connected with a tubular bus through a tubular bus terminal, a shielding ring sleeved outside the tubular bus terminal is arranged above the grading ring, and the shielding ring is connected with the tubular bus terminal through an equipment terminal. The shielding ring is provided with an opening for avoiding the tubular bus, and the vertical center line of the shielding ring deviates towards the direction close to the tubular bus relative to the vertical center line of the grading ring. The maximum electric field intensity of the surface of the connection fitting can be reduced, and the maximum electric field intensity is obviously lower than an air corona onset threshold value under the same altitude condition, so that corona discharge and noise are inhibited from the source, and displacement between the tubular bus and the high-voltage shunt reactor under the condition of high seismic intensity can be compensated.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power transmission and transformation, in particular to a 1000kV high-resistance terminal and tubular bus connection hardware for high-altitude and high-seismicity areas. BACKGROUND

[0002] A high-voltage shunt reactor is usually arranged at the outgoing line side of a 1000kV substation to compensate for line capacitive reactive power and limit power frequency overvoltage; a tubular bus is generally used for electrical connection between the high-voltage shunt reactor and the outgoing line arrester and voltage transformer. In order to realize reliable transition between the high-voltage shunt reactor and the tubular bus, a connection hardware must be arranged between the two.

[0003] In high-altitude areas, the corona inception voltage on the surface of the connection hardware decreases with the increase of altitude, and the conventional connection hardware is prone to strong corona discharge and noise, which has a great impact on the safe and reliable operation of the substation. Meanwhile, the overall height of the high-voltage shunt reactor at the outgoing line side of the 1000kV substation increases with the increase of altitude, and under high seismic intensity conditions, the relative displacement between the tubular bus and the high-voltage shunt reactor will be larger, which is prone to form fatigue cracks at the weld and bolt connection of the conventional connection hardware, and even cause rupture, seriously affecting the safe and stable operation of the substation. SUMMARY

[0004] The application aims to provide a 1000kV high-resistance terminal and tubular bus connection hardware for high-altitude and high-seismicity areas, which solves the problems of strong corona discharge and noise of the conventional connection hardware in high-altitude and high-seismicity areas, and the formation of fatigue cracks at the weld and bolt connection.

[0005] The application adopts the technical scheme to solve the technical problem: The 1000kV high-resistance terminal and tubular bus connection hardware for high-altitude and high-seismicity areas comprises a hardware body with a displacement compensation structure, the lower end of the hardware body passes through the grading ring at the top of the reactor, and is connected with the outgoing line terminal of the reactor through the equipment terminal, the upper end of the hardware body is connected with the tubular bus through a tubular bus terminal, a shielding ring is arranged in parallel above the grading ring and is sleeved on the tubular bus terminal and connected with the tubular bus terminal, an opening is arranged on the shielding ring to avoid the tubular bus, and the vertical center line of the shielding ring is offset towards the tubular bus relative to the vertical center line of the grading ring.

[0006] Further, the shielding ring and the grading ring together form a structure with the outer dimensions increasing first and then decreasing in the direction from top to bottom.

[0007] Further, the top of the shielding ring is higher than the top of the tubular bus terminal.

[0008] Further, the ring diameter of the shielding ring is 1400mm, the pipe diameter of the shielding ring is 350mm, and the height between the shielding ring and the uppermost voltage grading ring is 450mm.

[0009] Further, the fitting body includes a plurality of curved soft wires, the curved portions of the soft wires form the displacement compensation structure, and the two ends of the soft wires are connected with the device terminal and the pipe bus terminal respectively.

[0010] Further, the redundancy of the soft wire is greater than or equal to 800mm.

[0011] Further, the shielding ring is connected with the mounting seat arranged below the shielding ring through a plurality of circumferentially arranged connecting rods, and the mounting seat is connected with the pipe bus terminal.

[0012] Further, the inner wall of the shielding ring is connected with a ring plate, the ring plate is provided with an opening for avoiding the pipe bus, and the ring plate is connected with the connecting rod.

[0013] Further, the mounting seat includes a mounting plate connected with the connecting rod and a support plate connected with the mounting plate, and the support plate is connected with the pipe bus terminal.

[0014] Further, the pipe bus terminal includes two terminal plates arranged on the upper and lower sides of the pipe bus and a fastener connected between the two terminal plates.

[0015] The beneficial effects of the present application are as follows: The 1000kV high resistance terminal and pipe bus connecting fitting for high altitude and high seismic area provided by the embodiments of the present application sets an eccentric shielding ring on the outer sleeve of the pipe bus terminal, so that the vertical center line of the shielding ring is offset to the pipe bus from the voltage grading ring, thereby forming a continuous coupling shielding electric field between the voltage grading ring and the shielding ring, not only transferring the high field intensity area from the surface of the fitting to the gap between the ring bodies, reducing the surface field intensity of the connecting fitting as a whole, but also compensating the electric field distortion caused by the opening of the shielding ring by using the eccentric amount, further suppressing the local field intensity concentration.

[0016] The 1000kV high resistance terminal and pipe bus connecting fitting for high altitude and high seismic area provided by the embodiments of the present application sets an eccentric shielding ring on the outer sleeve of the pipe bus terminal, so that the vertical center line of the shielding ring is offset to the pipe bus from the voltage grading ring, thereby forming a continuous coupling shielding electric field between the voltage grading ring and the shielding ring, not only transferring the high field intensity area from the surface of the fitting to the gap between the ring bodies, reducing the surface field intensity of the connecting fitting as a whole, but also compensating the electric field distortion caused by the opening of the shielding ring by using the eccentric amount, further suppressing the local field intensity concentration.

[0017] Compared with the prior art, the application can reduce the maximum electric field intensity of the connecting fitting surface by coupling shielding and eccentric compensation, so that the maximum electric field intensity is significantly lower than the air corona threshold under the same altitude condition, the generation of corona discharge and noise is inhibited from the root, and the problem of strong corona discharge and noise generated by the conventional connecting fitting in high altitude areas is solved; the application can compensate the displacement between the tubular bus and the high-voltage shunt reactor by displacement compensation, reduce the mechanical stress of the welding seam and bolt connection of the connecting fitting, effectively prevent cracks or fractures from occurring at the connecting position, and ensure the continuous and safe operation of the substation. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some of the embodiments of the 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.

[0019] Figure 1 is a structural schematic diagram of the connecting fitting provided by the embodiments of the application; Figure 2 is a sectional view of the connecting fitting provided by the embodiments of the application; Figure 3 is a top view of the connecting fitting provided by the embodiments of the application; Figure 4 is a structural schematic diagram of the connection of the shielding ring and the tubular bus terminal; Figure 5 is a top view of the connection of the shielding ring and the tubular bus terminal; Figure 6 is a structural schematic diagram of Comparative Example 1; Figure 7 is a structural schematic diagram of Comparative Example 2; Figure 8 is a structural schematic diagram of Comparative Example 3; Figure 9 is a surface electric field distribution nephogram of the fitting body, the device terminal and the tubular bus terminal in Example 1; Figure 10 is a surface electric field distribution nephogram of the shielding ring in Example 1; Figure 11 is a surface electric field distribution nephogram of the connecting fitting of Comparative Example 1; Figure 12 is a surface electric field distribution nephogram of the fitting body, the device terminal and the tubular bus terminal in Comparative Example 2; Figure 13 is a surface electric field distribution nephogram of the shielding ring in Comparative Example 2; Figure 14is a surface electric field distribution nephogram of the fitting body, the equipment terminal and the tubular bus terminal in Comparative Example 3; Figure 15 is a surface electric field distribution nephogram of the shielding ring in Comparative Example 3.

[0020] Reference signs: 10 - fitting body; 101 - soft conductor; 11 - equipment terminal; 12 - electric reactor; 13 - tubular bus terminal; 131 - terminal plate; 132 - fastener; 14 - tubular bus; 15 - grading ring; 16 - shielding ring; 17 - connecting rod; 18 - mounting seat; 181 - mounting plate; 182 - support plate; 183 - reinforcing plate; 19 - ring plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the description of the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the above orientation description can be flexibly arranged in the actual application process under the condition of meeting the relative positional relationship shown in the drawings.

[0023] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] At present, the connecting fittings generally used in engineering are integral cast aluminum or cast iron structures, and typical configurations include T-shaped clamps, clamp clamps and their combination. Such connecting fittings are usually composed of a fitting body, a device terminal and a pipe bus terminal, the lower end of the fitting body passes through the grading ring at the top of the high-voltage shunt reactor, and is connected to the outgoing terminal of the high-voltage shunt reactor through the device terminal, the upper end of the fitting body is clamped to the pipe bus in a clamp manner through the pipe bus terminal, and the components are rigidly connected mechanically, and the whole forms a short bus section with a fixed span.

[0025] However, when the 1000 kV substation is built in a high-altitude and high-seismic-intensity area, such connecting fittings have the following defects: 1. The corona inception voltage of the surface of the connecting fitting decreases with the increase of the altitude, and the conventional connecting fitting is prone to strong corona discharge and noise, which has a great impact on the safe and reliable operation of the substation. 2. The overall height of the outgoing side high-voltage shunt reactor of the 1000 kV substation increases with the increase of the altitude, and under the condition of high seismic intensity, the relative displacement between the pipe bus and the high-voltage shunt reactor will be larger, which is easy to form fatigue cracks at the weld and bolt connection of the conventional connecting fitting, and even break, which seriously affects the safe and stable operation of the substation.

[0026] Based on this, referring to Figure 1 , Figure 2 , Figure 3 The embodiment of the present application provides a connecting fitting for connecting the outgoing terminal of a 1000 kV high-voltage shunt reactor and a pipe bus in a high-altitude and high-seismic-intensity area, which comprises a fitting body 10 with a displacement compensation structure, the lower end of the fitting body 10 passes through the grading ring 15 at the top of the reactor 12, and is connected to the outgoing terminal of the reactor 12 through the device terminal 11, the upper end of the fitting body 10 is connected to the pipe bus 14 through the pipe bus terminal 13, a shielding ring 16 is provided above the grading ring 15, the shielding ring 16 is sleeved outside the pipe bus terminal 13 and connected to the pipe bus terminal 13, an opening is provided on the shielding ring 16 to avoid the pipe bus 14, and the vertical center line of the shielding ring 16 is offset relative to the vertical center line of the grading ring 15 towards the pipe bus 14.

[0027] Specifically, the high-altitude and high-seismic-intensity area refers to an area with a maximum altitude of 4000 meters and a maximum seismic intensity of 9 degrees, the 1000 kV high-voltage shunt reactor terminal refers to the outgoing terminal of the 1000 kV high-voltage shunt reactor, and the pipe bus refers to the pipe bus.

[0028] The fitting body 10 is used to connect between the outgoing terminal of the reactor 12 and the tubular busbar 14, and then the current conduction between the reactor 12 and the tubular busbar 14 is realized through the fitting body 10. The fitting body 10 has a displacement compensation structure, by which the displacement between the tubular busbar 14 and the reactor 12 can be compensated. The reactor 12 refers to the high-voltage shunt reactor at the outgoing terminal side of the substation, and the outgoing terminal of the reactor 12 is arranged at the top thereof, and a plurality of grading rings 15 coaxially arranged from bottom to top are also fixed to the top of the reactor 12.

[0029] The lower end of the fitting body 10 passes through the grading ring 15 at the top of the reactor 12 and is fixedly connected with the equipment terminal 11, which is used to connect with the outgoing terminal of the reactor 12. For example, the equipment terminal 11 can be a flange structure, and is bolted to the outgoing terminal of the reactor 12 by using fasteners such as bolts. The upper end of the fitting body 10 is fixedly connected with the tubular busbar terminal 13, which is used to connect with the tubular busbar 14. For example, the tubular busbar terminal 13 can be a pipe clamp structure, which clamps the tubular busbar 14 in a hoop manner to realize the connection between the two.

[0030] The shielding ring 16 is a circular ring structure arranged horizontally and having an opening, which can also be referred to as a C-shaped structure. The shielding ring 16 is arranged in parallel above the grading ring 15 and is sleeved outside the tubular busbar terminal 13, so that not only the tubular busbar terminal 13 is shielded, but also a continuous coupling shielding electric field is formed by the shielding ring 16 and the grading ring 15 cooperating with each other, so as to enhance the mutual shielding effect between the shielding ring 16 and the grading ring 15. The shielding ring 16 is also connected with the tubular busbar terminal 13, and when the tubular busbar terminal 13 is connected with the tubular busbar 14, the tubular busbar 14 can be used to stably support the shielding ring 16. The opening of the shielding ring 16 faces the tubular busbar 14, and the width of the opening is greater than the outer diameter of the tubular busbar 14, so that interference between the shielding ring 16 and the tubular busbar 14 can be avoided, and it is ensured that the tubular busbar 14 can be placed in the opening of the shielding ring 16 and be smoothly connected with the tubular busbar terminal 13. The vertical center line of the shielding ring 16 is offset to the tubular busbar 14 relative to the grading ring 15, so that the eccentric amount of the shielding ring 16 can be used to compensate the electric field distortion caused by the opening of the shielding ring 16, improve the shielding effect of the tubular busbar terminal 13, and reduce the maximum electric field strength on the surface of the tubular busbar terminal 13.

[0031] The 1000kV high-resistance terminal and tube bus connecting hardware for high-altitude and high-seismicity areas provided by the embodiments of the present application is characterized in that: an eccentric shielding ring 16 is arranged outside the tube bus terminal 13, the vertical center line of the shielding ring 16 is offset to the tube bus 14 from the grading ring 15, a continuous coupling shielding electric field is formed between the grading ring 15 and the shielding ring 16, the high-field region is transferred from the surface of the hardware to the gap between the ring bodies, the surface field intensity of the connecting hardware is reduced as a whole, the electric field distortion caused by the opening of the shielding ring is compensated by the eccentricity, and the local field intensity concentration is further inhibited. By arranging the hardware body 10 with the displacement compensation structure, when a large multi-directional displacement occurs between the tube bus 14 and the reactor 12 under high seismic intensity conditions, the hardware body 10 can perform three-dimensional adaptive compensation by using the displacement compensation structure itself, and the mechanical stress of the welding seam and the bolt connection of the connecting hardware is significantly reduced.

[0032] Compared with the prior art, the present application can reduce the maximum electric field intensity on the surface of the connecting hardware by coupling shielding and eccentric compensation, so that the maximum electric field intensity is significantly lower than the air corona threshold under the same altitude condition, the generation of corona discharge and noise is inhibited from the root, and the problem that the conventional connecting hardware is prone to strong corona discharge and noise in high-altitude areas is solved. By means of displacement compensation, the displacement between the tube bus and the high-voltage shunt reactor can be compensated, the mechanical stress of the welding seam and the bolt connection of the connecting hardware is reduced, the cracks or fractures at the connecting position are effectively prevented, and the continuous and safe operation of the substation is ensured.

[0033] In some embodiments, referring to Figure 1 , Figure 2 , the shielding ring 16 and the plurality of grading rings 15 jointly form a structure whose overall size increases first and then decreases in the direction from top to bottom. This structure makes the shielding ring 16 and the plurality of grading rings 15 as a whole approximate to a spindle-shaped profile, the curvature radiuses of the top and bottom parts are small, the curvature radius of the middle part is large, a non-uniform capacitance distribution is formed, the potential gradient can be effectively dispersed, and the local electric field concentration is avoided, so as to further optimize the electric field distribution and inhibit the corona discharge. In order to improve the shielding effect of the shielding ring 16 on the tube bus terminal 13 as much as possible, the top of the shielding ring 16 is higher than the top of the tube bus terminal 13.

[0034] For example, the ring diameter of the shielding ring 16 is 1400mm, the tube diameter of the shielding ring 16 is 350mm, and the height between the shielding ring 16 and the uppermost grading ring 15 is 450mm. Among them, the ring diameter of the shielding ring 16 refers to the diameter of the horizontal circular center line of the shielding ring 16, that is, the diameter D1 in Figure 2 ; the tube diameter of the shielding ring 16 refers to the outer diameter of its cross section, that is, the diameter D2 in Figure 2 ; and the height between the shielding ring 16 and the uppermost grading ring 15 refers to the height between the horizontal center lines of the two, that is, the height H in Figure 2the height H1 in the middle.

[0035] In some embodiments, referring to Figure 1 , Figure 2 , Figure 3 The fitting body 10 includes a plurality of curvedly arranged flexible wires 101, the curved portions of the flexible wires 101 form displacement compensation structures, and the two ends of the flexible wires 101 are connected with the device terminal 11 and the busbar terminal 13 respectively. The flexible wires 101 can include two or more, all arranged in an S shape. The flexible wires 101 are flexible conductive bodies processed by a multi-strand fine metal wire using a complex twisting process. The fine metal wire can be made of conductive materials such as copper and aluminum. This structure increases the number of free units of the conductor cross section to improve overall flexibility while maintaining stable wire performance.

[0036] Correspondingly, by arranging the fitting body 10 as a plurality of curvedly arranged flexible wires 101, the two ends of the flexible wires 101 are connected with the device terminal 11 and the busbar terminal 13 respectively. When a large multi-directional displacement occurs between the tubular busbar 14 and the reactor 12 under high seismic intensity conditions, the flexible wires 101 can use their own bending allowance and elastic deformation capability for three-dimensional adaptive compensation, significantly reducing the mechanical stress at the welding seam and bolt connection, effectively preventing cracks or fractures at the connection site, and ensuring the continuous and safe operation of the substation. In order to ensure that the flexible wires 101 have sufficient allowance to meet the displacement requirements between the tubular busbar 14 and the reactor 12 during an earthquake, the redundancy of the flexible wires 101 is greater than or equal to 800 mm.

[0037] In some embodiments, referring to Figure 4 , Figure 5 The shielding ring 16 is connected with the mounting seat 18 arranged below it through a plurality of circumferentially arranged connecting rods 17, and the mounting seat 18 is connected with the busbar terminal 13.

[0038] Specifically, the mounting seat 18 is arranged below the inner hole of the shielding ring 16, the four connecting rods 17 are arranged along the circumference of the shielding ring 16, the upper ends of the four connecting rods 17 are fixedly connected with the shielding ring 16, and the lower ends of the four connecting rods 17 are fixedly connected with the mounting seat 18. The busbar terminal 13 is installed on the mounting seat 18 and faces the tubular busbar 14.

[0039] The upper end of the connecting rod 17 can be directly fixedly connected with the shielding ring 16, or can be fixedly connected with the shielding ring 16 through an intermediate piece. For example, Figure 4 , Figure 5The inner wall of the shielding ring 16 is connected to a ring plate 19, which has an opening for avoiding the tubular busbar 14. The ring plate 19 is connected to the connecting rod 17. The ring plate 19 can be fixedly connected to the inner wall of the shielding ring 16 by welding, and the upper end of the connecting rod 17 is connected to the ring plate 19 by bolts, which facilitates the connection and removal of the connecting rod 17 and the ring plate 19.

[0040] In some embodiments, see Figure 4 、 Figure 5 The mounting seat 18 includes a mounting plate 181 connected to the connecting rod 17 and a support plate 182 connected to the mounting plate 181 . The support plate 182 is connected to the female tube terminal 13 .

[0041] Specifically, mounting plate 181 is a horizontal circular plate positioned below the inner hole of shielding ring 16. The lower end of connecting rod 17 is bolted to mounting plate 181. Support plate 182 is vertically positioned and welded to mounting plate 181 at its lower end. Female tube terminal 13 is mounted on support plate 182. To enhance the secure connection between support plate 182 and mounting plate 181, a reinforcing plate 183 is welded between the two plates.

[0042] In some embodiments, see Figure 4 、 Figure 5 The tube female terminal 13 includes two terminal plates 131 provided on the upper and lower sides of the tube busbar 14 , and a fastener 132 connected between the two terminal plates 131 .

[0043] Specifically, the two terminal plates 131 are symmetrically arranged arc-shaped plates, and a cylindrical fixed cavity is formed between the two terminal plates 131; the lower terminal plate 131 is fixedly connected to the support plate 182 by bolts, and the upper terminal plate 131 is fixedly connected to the soft wire 101, and the two terminal plates 131 are fixedly connected by two groups of fasteners 132, and each group of fasteners 132 includes at least two bolt assemblies.

[0044] When connecting the female tube terminal 13 to the tubular busbar 14, first place the end of the tubular busbar 14 in the fixed cavity between the two terminal plates 131, then fix the two terminal plates 131 together through the fasteners 132, and then use the two terminal plates 131 to clamp the tubular busbar 14 to achieve the connection between the female tube terminal 13 and the tubular busbar 14.

[0045] Example 1: See also Figure 1The connecting hardware of Example 1 includes a hardware body 10. The lower end of the hardware body 10 passes through the four equalizing rings 15 at the top of the reactor 12 and is connected to the reactor 12 through the equipment terminal 11. The upper end of the hardware body 10 is connected to the tubular busbar 14 through the female tube terminal 13. The female tube terminal 13 is provided with a shielding ring 16 connected thereto. The shielding ring 16 is provided with an opening to avoid the tubular busbar 14. The vertical centerline of the shielding ring 16 is offset relative to the vertical centerline of the equalizing ring 15 in a direction closer to the tubular busbar 14. The hardware body 10 is for two soft wires 101. The ring diameter of the shielding ring 16 is 1400mm, the diameter of the shielding ring 16 is 350mm, and the height between the shielding ring 16 and the uppermost equalizing ring 15 is 450mm. The dimensions of the remaining structures are selected according to industry standards or conventional engineering experience and are not repeated here.

[0046] Comparative Example 1: See also Figure 6 , the shielding ring 16 is not provided in the comparative example 1, and the rest of the structure of the comparative example 1 is exactly the same as that of the embodiment 1.

[0047] Comparative Example 2: See also Figure 7 In comparative example 2, a shielding ring 16 is provided. The shielding ring 16 is arranged above the tube mother terminal 13 and is coaxially arranged with the four grading rings 15 on the top of the reactor 12. The rest of the structure of comparative example 2 is exactly the same as that of embodiment 1.

[0048] Comparative Example 3: See also Figure 8 In comparative example 2, the height of the shielding ring 16 is reduced. In order to avoid collision with the tubular busbar 14, the shielding ring 16 is set as an open ring. The shielding ring 16 is coaxially arranged with the four grading rings 15 on the top of the reactor 12; the rest of the structure of comparative example 3 is exactly the same as that of embodiment 1.

[0049] The connection fittings of Example 1, Comparative Example 1, Comparative Example 2 and Comparative Example 3 were simulated respectively. Figure 9 、 Figure 10 This is the electric field distribution cloud diagram of the hardware surface in Example 1. Figure 11 This is the electric field distribution cloud diagram of the hardware surface in comparative example 1. Figure 12 、 Figure 13 This is the electric field distribution cloud diagram of the hardware surface in comparative example 2. Figure 14 、 Figure 15 This is the electric field distribution cloud diagram of the hardware surface in comparative example 3.

[0050] The operating voltage of a 1000kV substation at an altitude of 4000m is 1000kV, and the electric field strength limit for corona discharge and noise generated on the surface of connecting fittings is 1.12kV / mm.

[0051] See also Figure 9 、Figure 10 The maximum value of the surface electric field intensity of the fitting body, the equipment terminal and the tube base terminal in Example 1 is 0.35 kV / mm, and the maximum value of the surface electric field intensity of the shielding ring in Example 1 is 1.11 kV / mm. Therefore, the maximum value of the surface electric field intensity of the connecting fitting in Example 1 is less than the electric field intensity limit value when corona discharge occurs, i.e., the connecting fitting in Example 1 will not cause corona discharge phenomenon at an altitude of 4000 m.

[0052] Referring to Figure 11 The maximum value of the surface electric field intensity of the fitting body, the equipment terminal and the tube base terminal in Comparative Example 1 is 2.7 kV / mm. Therefore, the maximum value of the surface electric field intensity of the connecting fitting in Comparative Example 1 is much greater than the electric field intensity limit value when corona discharge occurs, i.e., the connecting fitting in Comparative Example 1 will cause corona discharge phenomenon at an altitude of 4000 m.

[0053] Referring to Figure 12 , Figure 13 The maximum value of the surface electric field intensity of the fitting body, the equipment terminal and the tube base terminal in Comparative Example 2 is 0.35 kV / mm, and the maximum value of the surface electric field intensity of the shielding ring in Comparative Example 2 is 1.28 kV / mm. Therefore, the maximum value of the surface electric field intensity of the connecting fitting in Comparative Example 2 is greater than the electric field intensity limit value when corona discharge occurs, i.e., the connecting fitting in Comparative Example 2 will cause corona discharge phenomenon at an altitude of 4000 m.

[0054] Referring to Figure 14 , Figure 15 The maximum value of the surface electric field intensity of the fitting body, the equipment terminal and the tube base terminal in Comparative Example 3 is 0.35 kV / mm, and the maximum value of the surface electric field intensity of the shielding ring in Comparative Example 3 is 1.16 kV / mm. Therefore, the maximum value of the surface electric field intensity of the connecting fitting in Comparative Example 3 is greater than the electric field intensity limit value when corona discharge occurs, i.e., the connecting fitting in Comparative Example 3 will cause corona discharge phenomenon at an altitude of 4000 m.

[0055] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed by the present application can be easily thought by those skilled in the art, which should be covered within the protection scope of the present application.

Claims

1. A 1000kV high-voltage terminal and tubular busbar connection fitting for use in high-altitude and high-seismic areas, characterized by: The invention comprises a hardware body (10) having a displacement compensation structure, wherein the lower end of the hardware body (10) passes through a voltage-equalizing ring (15) at the top of a reactor (12) and is connected to the output terminal of the reactor (12) through an equipment terminal (11), and the upper end of the hardware body (10) is connected to a tubular busbar (14) through a tube mother terminal (13), and a shielding ring (16) is provided above the voltage-equalizing ring (15) and is sleeved outside the tube mother terminal (13) and connected to the tube mother terminal (13), wherein the shielding ring (16) is provided with an opening for avoiding the tubular busbar (14), and the vertical center line of the shielding ring (16) is offset in a direction close to the tubular busbar (14) relative to the vertical center line of the voltage-equalizing ring (15).

2. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 1 is characterized in that: The shielding ring (16) and the plurality of equalizing rings (15) together form a structure in which the outer dimensions first increase and then decrease in a direction from top to bottom.

3. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 1 is characterized in that: The top of the shielding ring (16) is higher than the top of the tube female terminal (13).

4. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 1 is characterized in that: The ring diameter of the shielding ring (16) is 1400 mm, the pipe diameter of the shielding ring (16) is 350 mm, and the height between the shielding ring (16) and the uppermost pressure equalizing ring (15) is 450 mm.

5. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 1, 2, 3 or 4, characterized in that: The hardware body (10) comprises a plurality of curved flexible conductors (101), the curved portions of the flexible conductors (101) forming the displacement compensation structure, and the two ends of the flexible conductors (101) being respectively connected to the device terminal (11) and the female tube terminal (13).

6. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 5, characterized in that: The redundancy of the flexible conductor (101) is greater than or equal to 800 mm.

7. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 1, characterized in that: The shielding ring (16) is connected to a mounting seat (18) provided below the shielding ring via a plurality of circumferentially arranged connecting rods (17), and the mounting seat (18) is connected to the female tube terminal (13).

8. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 7, characterized in that: The inner wall of the shielding ring (16) is connected to a ring plate (19), the ring plate (19) is provided with an opening for avoiding the tubular busbar (14), and the ring plate (19) is connected to the connecting rod (17).

9. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 7 or 8, characterized in that: The mounting seat (18) comprises a mounting plate (181) connected to the connecting rod (17), a support plate (182) connected to the mounting plate (181), and the support plate (182) is connected to the tube female terminal (13).

10. The 1000kV high-voltage terminal and tubular busbar connection fitting according to claim 1, characterized in that: The tube female terminal (13) comprises two terminal plates (131) provided on the upper and lower sides of the tube-shaped busbar (14), and a fastener (132) connected between the two terminal plates (131).

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