1000kv high resistance terminal and tube bus connection hardware for high altitude high seismic area

Abstract

The application discloses a 1000kV high-resistance terminal and tube bus connecting hardware for high-altitude high-seismic areas, and relates to the technical field of power transmission and transformation engineering. The connecting hardware comprises a hardware body with a displacement compensation structure, the lower end of the hardware body passes through a grading ring at the top of a reactor and is connected with a outgoing terminal of the reactor through a device terminal, the upper end of the hardware body is connected with a tube bus through a tube bus terminal, a shielding ring is arranged on the tube bus terminal, an opening for avoiding the tube bus is arranged on the shielding ring, and the vertical center line of the shielding ring is offset towards the tube bus relative to the vertical center line of the grading ring. The application can reduce the maximum electric field intensity on the surface of the connecting hardware, so that the electric field intensity is significantly lower than the air corona threshold under the same altitude condition, thereby inhibiting the generation of corona discharge and noise from the root, and the displacement between the tube bus and the high-voltage shunt reactor under high seismic intensity conditions can be compensated.

Description

Technical Field

[0001] This application relates to the field of power transmission and transformation engineering technology, specifically to a 1000kV high-resistance terminal and busbar connection fitting for use in high-altitude and high-seismic zones. Background Technology

[0002] High-voltage shunt reactors are typically installed on the outgoing line side of 1000kV substations to compensate for capacitive reactive power and limit power frequency overvoltage. The high-voltage shunt reactors are generally electrically connected to the outgoing line surge arresters and voltage transformers using tubular busbars. To ensure a reliable transition between the high-voltage shunt reactors and the tubular busbars, connecting hardware must be installed between them.

[0003] In high-altitude areas, the corona initiation voltage on the surface of connecting hardware decreases with increasing altitude. Conventional connecting hardware is prone to strong corona discharge and noise, significantly impacting the safe and reliable operation of substations. Simultaneously, the overall height of the high-voltage shunt reactor on the outgoing line side of a 1000 kV substation increases with altitude. Under high seismic intensity conditions, the relative displacement between the tubular busbar and the high-voltage shunt reactor increases, easily leading to fatigue cracks and even fractures at the welds and bolt connections of conventional connecting hardware, severely affecting the safe and stable operation of the substation. Utility Model Content

[0004] The purpose of this application is to provide a 1000kV high-impact terminal and busbar connection fitting for use in high-altitude and high-seismic-intensity areas, which solves the problems of conventional connection fittings being prone to strong corona discharge and noise in high-altitude and high-seismic-intensity areas, as well as fatigue cracks and even fractures at welds and bolt connections.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] A 1000kV high-resistance terminal and busbar connection fitting for high-altitude, high-seismic zones includes a fitting body with a displacement compensation structure. The lower end of the fitting body passes through the equalizing ring at the top of the reactor and is connected to the reactor's output terminal via an equipment terminal. The upper end of the fitting body is connected to a tubular busbar via a busbar terminal. A shielding ring is provided parallel above the equalizing ring, fitted around the busbar terminal and connected to it. The shielding ring has an opening to avoid the tubular busbar. The vertical center line of the shielding ring is offset relative to the vertical center line of the equalizing ring towards the tubular busbar.

[0007] Furthermore, the shielding ring and several equalizing rings together form a structure whose external dimensions first increase and then decrease in the direction from top to bottom.

[0008] Furthermore, the top of the shielding ring is higher than the top of the female terminal.

[0009] Furthermore, the shielding ring has a diameter of 1400mm, a tube diameter of 350mm, and a height of 450mm between the shielding ring and the uppermost equalizing ring.

[0010] Furthermore, the hardware body includes a plurality of flexible wires arranged in a bent manner, the bent portion of the flexible wires forming the displacement compensation structure, and the two ends of the flexible wires being connected to the equipment terminal and the tube terminal, respectively.

[0011] Furthermore, the redundancy of the flexible conductor is greater than or equal to 800 mm.

[0012] Furthermore, the shielding ring is connected to a mounting base located below it via several circumferentially arranged connecting rods, and the mounting base is connected to the female terminal of the tube.

[0013] Furthermore, the inner wall of the shielding ring is connected to a ring plate, the ring plate having an opening to avoid the tubular busbar, and the ring plate being connected to the connecting rod.

[0014] Furthermore, the mounting base includes a mounting plate connected to the connecting rod and a support plate connected to the mounting plate, the support plate being connected to the female terminal.

[0015] Furthermore, the tube terminal includes two terminal plates disposed on the upper and lower sides of the tube busbar, and fasteners connecting the two terminal plates.

[0016] The beneficial effects of this application are:

[0017] The 1000kV high-impact terminal and busbar connection fitting provided in this application embodiment for high-altitude and high-seismic zones achieves this by installing an eccentric shielding ring around the busbar terminal. This causes the vertical centerline of the shielding ring to shift relative to the equalizing ring towards the busbar, thereby forming a continuous coupled shielding electric field between the equalizing ring and the shielding ring. This not only transfers the high field strength area from the surface of the fitting to the gap between the rings, reducing the overall surface field strength of the connection fitting, but also uses the eccentricity to compensate for the electric field distortion caused by the opening of the shielding ring, further suppressing local field strength concentration.

[0018] The 1000kV high-resistance terminal and busbar connection hardware provided in this application embodiment for high-altitude and high-seismic zones, by setting a hardware body with a displacement compensation structure, when a large-scale multi-directional relative displacement occurs between the tubular busbar and the reactor under high seismic intensity conditions, the hardware body can use its own displacement compensation structure to perform three-dimensional adaptive compensation, which significantly reduces the mechanical stress at the weld and bolt connection of the connection hardware.

[0019] Compared to existing technologies, this application reduces the maximum electric field intensity on the surface of the connecting hardware by using coupling shielding and eccentric compensation, making it significantly lower than the air corona induction threshold under the same altitude conditions. This fundamentally suppresses the generation of corona discharge and noise, solving the problem that conventional connecting hardware is prone to strong corona discharge and noise in high-altitude areas. Furthermore, this application compensates for the displacement between the tubular busbar and the high-voltage parallel reactor by using displacement compensation, reducing the mechanical stress at the welds and bolt connections of the connecting hardware, effectively preventing cracks or fractures at the connection points, and ensuring the continuous safe operation of the substation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the connecting hardware provided in the embodiments of this application;

[0022] Figure 2 This is a cross-sectional view of the connecting fittings provided in the embodiments of this application;

[0023] Figure 3 This is a top view of the connecting fittings provided in the embodiments of this application;

[0024] Figure 4 This is a schematic diagram of the connection between the shielding ring and the female terminal of the tube;

[0025] Figure 5 This is a top view of the connection between the shielding ring and the female terminal of the tube;

[0026] Figure 6 This is a schematic diagram of the structure in Comparative Example 1;

[0027] Figure 7 This is a structural diagram of Comparative Example 2;

[0028] Figure 8 This is a structural diagram of Comparative Example 3;

[0029] Figure 9 This is a surface electric field distribution cloud map of the fitting body, equipment terminal, and tube terminal in Example 1;

[0030] Figure 10 This is a surface electric field distribution cloud map of the shielding ring in Example 1;

[0031] Figure 11 This is a surface electric field distribution cloud map of the connecting hardware in Comparative Example 1;

[0032] Figure 12 This is a surface electric field distribution cloud map of the fitting body, equipment terminal, and pipe terminal in Comparative Example 2;

[0033] Figure 13 This is a surface electric field distribution cloud map of the shielding ring in Comparative Example 2;

[0034] Figure 14 This is a surface electric field distribution cloud map of the hardware body, equipment terminal and pipe terminal in Comparative Example 3;

[0035] Figure 15 This is a surface electric field distribution cloud map of the shielding ring in Comparative Example 3.

[0036] Figure label:

[0037] 10-Fit body; 101-Flexible wire;

[0038] 11-Equipment terminals;

[0039] 12-Reactor;

[0040] 13-Pipe female terminal; 131-Terminal plate; 132-Fastener;

[0041] 14-Tube type busbar;

[0042] 15 - Equalizing ring;

[0043] 16-Shielding ring;

[0044] 17-Connecting rod;

[0045] 18-Mounting base; 181-Mounting plate; 182-Support plate; 183-Reinforcing plate;

[0046] 19-Ring plate. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0048] In the description of this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] Currently, the connecting hardware commonly used in engineering is an integral cast aluminum or cast iron structure, with typical configurations including T-shaped clamps, clamping clamps, and their assemblies. This type of connecting hardware typically consists of a hardware body, equipment terminals, and a conduit terminal. The lower end of the hardware body passes through the equalizing ring at the top of the high-voltage shunt reactor and is bolted to the output terminal of the high-voltage shunt reactor via the equipment terminal. The upper end of the hardware body clamps the conduit busbar using a clamping method via the conduit terminal. All components are rigidly mechanically connected, forming a short busbar segment with a fixed span.

[0051] However, when a 1000kV substation is built in a high-altitude, high-seismic-intensity area, these types of connection hardware have the following drawbacks: 1. The corona initiation voltage on the surface of the connection hardware decreases with increasing altitude. Conventional connection hardware is prone to generating strong corona discharge phenomena and noise, which significantly affects the safe and reliable operation of the substation. 2. The overall height of the high-voltage parallel reactor on the outgoing side of the 1000 kV substation increases with increasing altitude. Under high seismic intensity conditions, the relative displacement between the tubular busbar and the high-voltage parallel reactor will increase, making it easy for fatigue cracks to form at the welds and bolt connections of conventional connection hardware, and even causing fractures, seriously affecting the safe and stable operation of the substation.

[0052] Based on this, see Figure 1 , Figure 2 , Figure 3This application provides a 1000kV high-resistance terminal and busbar connection fitting for high-altitude and high-seismic zones. The fitting body 10 has a displacement compensation structure. The lower end of the fitting body 10 passes through the equalizing ring 15 at the top of the reactor 12 and is connected to the output terminal of the reactor 12 through the equipment terminal 11. The upper end of the fitting body 10 is connected to the tubular busbar 14 through the busbar terminal 13. A shielding ring 16 is provided above the equalizing ring 15, which is sleeved on the outside of the busbar terminal 13 and connected to the busbar terminal 13. The shielding ring 16 has an opening to avoid the tubular busbar 14. The vertical center line of the shielding ring 16 is offset relative to the vertical center line of the equalizing ring 15 towards the tubular busbar 14.

[0053] Specifically, high-altitude and high-seismic zones refer to areas with a maximum altitude of 4,000 meters and a maximum seismic intensity of 9 degrees; 1000kV high-resistance terminals refer to the outgoing terminals of 1000kV high-voltage parallel reactors; and tubular busbars refer to tubular busbars.

[0054] The fitting body 10 is used to connect the outgoing terminals of the reactor 12 to the tubular busbar 14, thereby enabling current conduction between the reactor 12 and the tubular busbar 14. The fitting body 10 has a displacement compensation structure, which can compensate for the displacement generated between the tubular busbar 14 and the reactor 12. The reactor 12 refers to the high-voltage parallel reactor on the outgoing side of the substation. The outgoing terminals of the reactor 12 are located on its top, and several equalizing rings 15 are also fixed on the top of the reactor 12, arranged coaxially from bottom to top.

[0055] The lower end of the fitting body 10 passes through the equalizing ring 15 at the top of the reactor 12 and is fixedly connected to the equipment terminal 11, which is used to connect to the output terminal of the reactor 12. For example, the equipment terminal 11 can be a flange structure, bolted to the output terminal of the reactor 12 using fasteners such as bolts. The upper end of the fitting body 10 is fixedly connected to the female tube terminal 13, which is used to connect to the tubular busbar 14. For example, the female tube terminal 13 can be a clamp structure, clamping the tubular busbar 14 in a clamping manner to achieve the connection between the two.

[0056] The shielding ring 16 is a horizontally positioned, open, annular structure, also known as a C-type structure. The shielding ring 16 is arranged parallel above the equalizing ring 15 and fits around the tube terminal 13. This not only shields the tube terminal 13 but also enhances the mutual shielding effect between the shielding ring 16 and the equalizing ring 15 by forming a continuously coupled shielding electric field. The shielding ring 16 is also connected to the tube terminal 13. When the tube terminal 13 is connected to the tubular busbar 14, the tubular busbar 14 provides stable support for 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. This avoids interference between the shielding ring 16 and the tubular busbar 14, ensuring that the tubular busbar 14 can be placed within the opening of the shielding ring 16 and smoothly connected to the tube terminal 13. The vertical centerline of the shielding ring 16 is offset relative to the equalizing ring 15 towards the tubular busbar 14. This allows the eccentricity of the shielding ring 16 to compensate for the electric field distortion caused by the opening of the shielding ring 16, thereby improving the shielding effect on the tube busbar terminal 13 and reducing the maximum electric field intensity on the surface of the tube busbar terminal 13.

[0057] The 1000kV high-impact terminal and busbar connection fitting provided in this application embodiment for high-altitude, high-seismic zones utilizes an eccentric shielding ring 16 fitted over the busbar terminal 13. This causes the vertical centerline of the shielding ring 16 to shift relative to the equalizing ring 15 towards the busbar 14, thereby creating a continuous coupled shielding electric field between the equalizing ring 15 and the shielding ring 16. This not only transfers the high field strength region from the fitting surface to the gap between the rings, reducing the overall surface field strength of the connection fitting, but also compensates for the electric field distortion caused by the opening of the shielding ring using the eccentricity, further suppressing local field strength concentration. By incorporating a fitting body 10 with a displacement compensation structure, when a large-scale multi-directional relative displacement occurs between the busbar 14 and the reactor 12 under high seismic intensity conditions, the fitting body 10 can perform three-dimensional adaptive compensation using its own displacement compensation structure, significantly reducing the mechanical stress at the welds and bolt connections of the connection fitting.

[0058] Compared to existing technologies, this application reduces the maximum electric field intensity on the surface of the connecting hardware by using coupling shielding and eccentric compensation, making it significantly lower than the air corona induction threshold under the same altitude conditions. This fundamentally suppresses the generation of corona discharge and noise, solving the problem that conventional connecting hardware is prone to strong corona discharge and noise in high-altitude areas. Furthermore, this application compensates for the displacement between the tubular busbar and the high-voltage parallel reactor by using displacement compensation, reducing the mechanical stress at the welds and bolt connections of the connecting hardware, effectively preventing cracks or fractures at the connection points, and ensuring the continuous safe operation of the substation.

[0059] In some embodiments, see Figure 1 , Figure 2The shielding ring 16 and several equalizing rings 15 together form a structure whose overall dimensions increase first and then decrease from top to bottom. This structure makes the shielding ring 16 and several equalizing rings 15 approximately spindle-shaped, with a smaller radius of curvature at the top and bottom and a larger radius of curvature in the middle, forming a non-uniform capacitance distribution. This effectively disperses the potential gradient, avoids local electric field concentration, and further optimizes the electric field distribution and suppresses corona discharge. To maximize the shielding effect of the shielding ring 16 on the female terminal 13, the top of the shielding ring 16 is higher than the top of the female terminal 13.

[0060] For example, the shielding ring 16 has a ring diameter of 1400 mm, a tube diameter of 350 mm, and a height of 450 mm between the shielding ring 16 and the uppermost equalizing ring 15. The ring diameter of the shielding ring 16 refers to the diameter of the horizontally arranged circular centerline of the shielding ring 16. Figure 2 The diameter D1 in the figure; the diameter of the shielding ring 16 refers to the outer diameter of its cross-section, i.e. Figure 2 The diameter D2 in the middle; the height between the shielding ring 16 and the uppermost equalizing ring 15 refers to the height between their horizontal center lines, that is... Figure 2 The height H1 in the middle.

[0061] In some embodiments, see Figure 1 , Figure 2 , Figure 3 The hardware body 10 includes several bent flexible wires 101. The bent portions of the flexible wires 101 form a displacement compensation structure. The two ends of the flexible wires 101 are connected to the equipment terminal 11 and the female connector terminal 13, respectively. The flexible wires 101 may include two or more, all arranged in an S-shape. The flexible wires 101 are flexible conductors made by twisting multiple strands of fine metal wires. The fine metal wires can be made of conductive materials such as copper and aluminum. This structure improves overall flexibility by increasing the number of free-moving units in the conductor cross-section while maintaining stable wire performance.

[0062] Correspondingly, by configuring the hardware body 10 as a plurality of spatially curved flexible conductors 101, with both ends of the flexible conductors 101 connected to the equipment terminal 11 and the tube bus terminal 13 respectively, when a large-scale multi-directional relative displacement occurs between the tube bus 14 and the reactor 12 under high seismic intensity conditions, the flexible conductors 101 can utilize their own bending margin and elastic deformation capacity for three-dimensional adaptive compensation, significantly reducing the mechanical stress at welds and bolted connections, effectively preventing cracks or fractures at the connection points, and ensuring the continuous safe operation of the substation. To ensure that the flexible conductors 101 have sufficient margin to meet the displacement requirements between the tube bus 14 and the reactor 12 during an earthquake, the redundancy of the flexible conductors 101 is greater than or equal to 800 mm.

[0063] In some embodiments, see Figure 4 , Figure 5 The shielding ring 16 is connected to the mounting base 18 located below it via several circumferentially arranged connecting rods 17, and the mounting base 18 is connected to the female terminal 13.

[0064] Specifically, the mounting base 18 is located below the inner hole of the shielding ring 16, and four connecting rods 17 are evenly distributed along the circumference of the shielding ring 16. The upper ends of the four connecting rods 17 are fixedly connected to the shielding ring 16, and the lower ends of the four connecting rods 17 are fixedly connected to the mounting base 18. The female tube terminal 13 is mounted on the mounting base 18 and faces the tubular busbar 14.

[0065] The upper end of the connecting rod 17 can be directly fixedly connected to the shielding ring 16, or it can be fixedly connected to the shielding ring 16 through an intermediate component. For example, see... Figure 4 , Figure 5 The inner wall of the shielding ring 16 is connected to a ring plate 19, which has an opening to avoid 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. The upper end of the connecting rod 17 can be connected to the ring plate 19 by bolts, which facilitates the connection and disassembly between the connecting rod 17 and the ring plate 19.

[0066] In some embodiments, see Figure 4 , Figure 5 The mounting base 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 terminal 13.

[0067] Specifically, the mounting plate 181 is a horizontally positioned circular plate located below the inner hole of the shielding ring 16; the lower end of the connecting rod 17 is connected to the mounting plate 181 by bolts; the support plate 182 is vertically positioned and its lower end is welded to the mounting plate 181; the female terminal 13 is mounted on the support plate 182. To improve the robustness of the connection between the support plate 182 and the mounting plate 181, a reinforcing plate 183 is also welded between the support plate 182 and the mounting plate 181.

[0068] In some embodiments, see Figure 4 , Figure 5 The tube bus 13 includes two terminal plates 131 located on the upper and lower sides of the tube bus 14, and fasteners 132 connected between the two terminal plates 131.

[0069] Specifically, the two terminal plates 131 are symmetrically arranged arc-shaped plates, and a cylindrical fixing 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 flexible wire 101. The two terminal plates 131 are fixedly connected by two sets of fasteners 132, and each set of fasteners 132 includes at least two bolt assemblies.

[0070] When connecting the female terminal 13 to the tubular busbar 14, the end of the tubular busbar 14 is first placed in the fixed cavity between the two terminal plates 131, and then the two terminal plates 131 are fixedly connected together by fasteners 132. Then, the tubular busbar 14 is clamped by the two terminal plates 131 to realize the connection between the female terminal 13 and the tubular busbar 14.

[0071] Example 1:

[0072] See Figure 1 The connection fitting in Embodiment 1 includes a fitting body 10. The lower end of the fitting body 10 passes through the four equalizing rings 15 at the top of the reactor 12 and is bolted to the reactor 12 via a device terminal 11. The upper end of the fitting body 10 is connected to a tubular busbar 14 via a female terminal 13. A shielding ring 16 is sleeved on the female terminal 13 and connected thereto. The shielding ring 16 has an opening to avoid the tubular busbar 14, and the vertical center line of the shielding ring 16 is offset relative to the vertical center line of the equalizing ring 15 towards the tubular busbar 14. The fitting body 10 consists of two flexible conductors 101. 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 equalizing ring 15 is 450mm. The dimensions of the remaining structures are selected according to industry standards or conventional engineering experience and will not be described further.

[0073] Comparative Example 1:

[0074] See Figure 6 Comparative Example 1 does not have a shielding ring 16, and the rest of the structure of Comparative Example 1 is exactly the same as that of Example 1.

[0075] Comparative Example 2:

[0076] See Figure 7 Comparative Example 2 is provided with a shielding ring 16, which is located above the female terminal 13 and is arranged coaxially with the four equalizing 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 Example 1.

[0077] Comparative Example 3:

[0078] See Figure 8Comparative Example 2 reduces the height of the shielding ring 16. To avoid collision with the tubular busbar 14, the shielding ring 16 is set as an open ring. The shielding ring 16 and the four equalizing rings 15 on the top of the reactor 12 are arranged coaxially. The rest of the structure of Comparative Example 3 is exactly the same as that of Example 1.

[0079] Simulations were performed on the connecting fittings of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3, respectively. Figure 9 , Figure 10 This is a cloud map showing the electric field distribution on the surface of the fittings in Example 1. Figure 11 This is a contour map of the electric field distribution on the surface of the fittings in Comparative Example 1. Figure 12 , Figure 13 This is a contour map of the electric field distribution on the surface of the fittings in Comparative Example 2. Figure 14 , Figure 15 This is a cloud map showing the electric field distribution on the surface of the fittings in Comparative Example 3.

[0080] 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 on the surface of the connecting hardware is 1.12kV / mm.

[0081] See Figure 9 , Figure 10 In Example 1, the maximum surface electric field strength of the fitting body, equipment terminals, and female connector terminals is 0.35 kV / mm, while the maximum surface electric field strength of the shielding ring is 1.11 kV / mm. Therefore, the maximum surface electric field strength of the fitting in Example 1 is less than the limit of electric field strength during corona discharge, meaning that the fitting in Example 1 will not experience corona discharge at an altitude of 4000m.

[0082] See Figure 11 In Comparative Example 1, the maximum surface electric field strength of the fitting body, equipment terminals, and pipe terminals is 2.7 kV / mm. Therefore, the maximum surface electric field strength of the fitting in Comparative Example 1 is much greater than the electric field strength limit during corona discharge, meaning that the fitting in Comparative Example 1 will experience corona discharge at an altitude of 4000m.

[0083] See Figure 12 , Figure 13 In Comparative Example 2, the maximum surface electric field strength of the fitting body, equipment terminals, and pipe terminals is 0.35 kV / mm, while the maximum surface electric field strength of the shielding ring is 1.28 kV / mm. Therefore, the maximum surface electric field strength of the connecting fitting in Comparative Example 2 is greater than the limit of electric field strength during corona discharge, meaning that the connecting fitting in Comparative Example 2 will experience corona discharge at an altitude of 4000m.

[0084] See Figure 14 , Figure 15In Comparative Example 3, the maximum surface electric field strength of the fitting body, equipment terminals, and female connector terminals is 0.35 kV / mm, while the maximum surface electric field strength of the shielding ring in Comparative Example 3 is 1.16 kV / mm. Therefore, the maximum surface electric field strength of the connecting fitting in Comparative Example 3 is greater than the limit of electric field strength during corona discharge, meaning that the connecting fitting in Comparative Example 3 will experience corona discharge at an altitude of 4000m.

[0085] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A type of fitting for connecting a 1000kV high-impact terminal to a busbar in high-altitude, high-seismic-zone areas, characterized in that... The device includes a fitting body (10) with a displacement compensation structure. The lower end of the fitting body (10) passes through the equalizing ring (15) at the top of the reactor (12) and is connected to the output terminal of the reactor (12) through the equipment terminal (11). The upper end of the fitting body (10) is connected to the tubular busbar (14) through the tube terminal (13). A shielding ring (16) is provided above the equalizing ring (15) and is sleeved on the tube terminal (13) and connected to the tube terminal (13). The shielding ring (16) has an opening to avoid the tubular busbar (14). The vertical center line of the shielding ring (16) is offset relative to the vertical center line of the equalizing ring (15) towards the tubular busbar (14).

2. The 1000kV high-resistance terminal and busbar connection fitting according to claim 1, characterized in that, The shielding ring (16) and several equalizing rings (15) together form a structure whose external dimensions first increase and then decrease in the direction from top to bottom.

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

4. The 1000kV high-resistance terminal and busbar connection fitting according to claim 1, characterized in that, The shielding ring (16) has a ring diameter of 1400mm, a tube diameter of 350mm, and a height of 450mm between the shielding ring (16) and the uppermost equalizing ring (15).

5. The 1000kV high-resistance terminal and busbar connection fitting according to claim 1, 2, 3 or 4, characterized in that, The fitting body (10) includes a plurality of flexible wires (101) arranged in a curved manner. The curved portion of the flexible wires (101) forms the displacement compensation structure. The two ends of the flexible wires (101) are respectively connected to the equipment terminal (11) and the tube terminal (13).

6. The 1000kV high-resistance terminal and 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-resistance terminal and busbar connection fitting according to claim 1, characterized in that, The shielding ring (16) is connected to the mounting base (18) located below it via several circumferentially arranged connecting rods (17), and the mounting base (18) is connected to the female terminal (13).

8. The 1000kV high-resistance terminal and 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), and the ring plate (19) is provided with an opening to avoid the tubular busbar (14). The ring plate (19) is connected to the connecting rod (17).

9. The 1000kV high-resistance terminal and busbar connection fitting according to claim 7 or 8, characterized in that, The mounting base (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 terminal (13).

10. The 1000kV high-resistance terminal and busbar connection fitting according to claim 1, characterized in that, The tube bus terminal (13) includes two terminal plates (131) disposed on the upper and lower sides of the tube bus (14) and fasteners (132) connecting the two terminal plates (131).

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