An 800kV three-column pin-shaped DC disconnect switch and its wind-resistant support structure

Abstract

This utility model provides an 800kV three-column triangular DC disconnector and its wind-resistant support structure, including an upper insulator assembly, a lower insulator assembly, a top connecting mechanism, a middle wind-resistant mechanism, and a base mechanism. Both the upper and lower insulator assemblies include three insulators. The middle wind-resistant mechanism includes a connecting beam and three connecting seats, with each pair of connecting seats connected by the connecting beam. Each connecting seat also has a built-in vertical support assembly to improve structural rigidity. By adding and securing the middle wind-resistant mechanism between the upper and lower insulator assemblies, and through the cooperation of the connecting seats, connecting beam, and vertical support assembly, the structural rigidity is improved, the connection rigidity at the joint between the upper and lower insulator assemblies is enhanced, and the wind resistance stability at the insulator joint is improved. This eliminates the need to increase the number of insulators, resulting in a simple structure, convenient assembly, and strong resistance to wind load displacement.

Description

Technical Field

[0001] This utility model relates to the technical field of 800kV three-column pin-shaped DC disconnect switches, and in particular to an 800kV three-column pin-shaped DC disconnect switch and its wind-resistant support structure. Background Technology

[0002] The 800kV DC disconnector is basically a 3-post combined support structure, that is, the dynamic and static sides are each supported by a 3-post insulator in a triangular arrangement. This structure is relatively mature and is widely used in various UHVDC projects. The insulation support structure has high stability and good adaptability in most regions.

[0003] With the advancement of my country's West-to-East Power Transmission Project, outdoor transmission equipment, including 800kV DC disconnectors, is prone to significant swaying and shaking under strong wind loads at the sending-end DC stations, severely impacting long-term reliable operation. Current technologies typically increase the number of insulators to improve resistance to displacement. However, increasing the number of individual insulators usually only doubles the resistance, meaning the resistance is only proportional to the number of insulators. Furthermore, since the displacement is caused by wind load, increasing the number of insulators also increases the wind-exposed area of ​​the 800kV DC disconnectors, significantly offsetting any potential improvement in wind load resistance. This results in a less significant improvement and increased costs.

[0004] Therefore, it is necessary to propose an 800kV three-column triangular DC disconnect switch and its wind-resistant support structure to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this invention is to provide a wind-resistant support structure for an 800kV three-column DC disconnector, so as to solve the problem that the wind-resistant method of increasing the number of insulators in the prior art is not effective and has high cost.

[0006] To achieve the above objectives, this utility model provides a wind-resistant support structure for an 800kV three-column triangular DC disconnector, including an upper insulator assembly, a lower insulator assembly, and a top connecting mechanism, a middle wind-resistant mechanism, and a base mechanism arranged sequentially from top to bottom; wherein,

[0007] The upper insulator assembly is connected between the top connecting mechanism and the middle wind-resistant mechanism, and the lower insulator assembly is connected between the base mechanism and the middle wind-resistant mechanism. Both the upper insulator assembly and the lower insulator assembly include three insulators arranged in a triangular shape.

[0008] The intermediate wind-resistant mechanism includes a connecting beam and three connecting seats arranged in a triangular shape. The top of each connecting seat is connected to an insulator of the upper insulator assembly, and the bottom of each connecting seat is connected to an insulator of the lower insulator assembly. Every two connecting seats are connected by the connecting beam, and each connecting seat also has a built-in vertical support assembly for improving structural rigidity.

[0009] Preferably, each of the connecting seats includes an upper connecting plate, a lower connecting plate, and an annular support. The annular support is connected between the upper connecting plate and the lower connecting plate, and both the upper connecting plate and the lower connecting plate have through holes arranged coaxially with the annular support. The vertical support assembly is connected to the outside of the annular support and supported between the upper connecting plate and the lower connecting plate.

[0010] Preferably, the vertical support assembly includes a plurality of vertical support plates arranged circumferentially along the annular support, one end of each vertical support plate being connected to the side wall of the annular support, and the annular support being supported between the upper connecting plate and the lower connecting plate.

[0011] Preferably, the connecting beam is made of I-beam, and the end of the connecting beam is embedded between the upper connecting plate and the lower connecting plate of the connecting seat.

[0012] Preferably, the base mechanism includes a bottom cross brace and three bases arranged in a triangular shape, each base having an insulator of the lower insulator assembly connected to it, and every two bases being connected by the bottom cross brace.

[0013] Preferably, the outer ends of the upper connecting plate and the lower connecting plate are arranged in an arc shape.

[0014] Preferably, both the upper connecting plate and the lower connecting plate are provided with a plurality of bolt holes spaced apart circumferentially along the annular support. The bottom end of the insulator of the upper insulator assembly is connected to the upper connecting plate by bolts, and the top end of the insulator of the lower insulator assembly is connected to the lower connecting plate by bolts.

[0015] Preferably, the end of the connecting beam is connected to the upper and lower connecting plates of the connecting seat by welding.

[0016] Preferably, the number of vertical support plates in the vertical support assembly is six, and the six vertical support plates are arranged at intervals along the circumference of the annular support.

[0017] This application also provides an 800kV three-column pin-shaped DC disconnector, including a contact mechanism and a wind-resistant support structure for the 800kV three-column pin-shaped DC disconnector as described above, wherein the contact mechanism is connected to the top connection mechanism of the wind-resistant support structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model provides an 800kV three-column triangular DC disconnect switch and its wind-resistant support structure, including an upper insulator assembly, a lower insulator assembly, and a top connecting mechanism, a middle wind-resistant mechanism, and a base mechanism arranged sequentially from top to bottom. The upper insulator assembly is connected between the top connecting mechanism and the middle wind-resistant mechanism, and the lower insulator assembly is connected between the base mechanism and the middle wind-resistant mechanism. Both the upper and lower insulator assemblies include three insulators arranged in a triangular shape. The middle wind-resistant mechanism includes a connecting beam and three connecting seats arranged in a triangular shape. The top of each connecting seat is connected to an insulator of the upper insulator assembly, and the bottom of each connecting seat is connected to an insulator of the lower insulator assembly. Every two connecting seats are connected by a connecting beam, and each connecting seat also has a built-in vertical support assembly for improving structural rigidity. By adding and securing the intermediate wind-resistant mechanism between the upper and lower insulator assemblies, and through the cooperation between the intermediate wind-resistant mechanism and the connecting seat, connecting beam, and vertical support assembly, the structural rigidity is improved. This enhances the connection rigidity at the joint between the upper and lower insulator assemblies, significantly improving the wind resistance stability of the insulator joint. Furthermore, it eliminates the need to increase the number of insulators, resulting in a simple structure, convenient assembly, and strong resistance to wind load displacement. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of the wind-resistant support structure in one embodiment of the present invention;

[0022] Figure 2 This is a three-dimensional schematic diagram of the intermediate wind-resistant mechanism in one embodiment of the present invention;

[0023] Figure 3 This is a plan view of the intermediate wind-resistant mechanism in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the overall structure of this utility model in an application scenario.

[0025] Figure 5 A schematic diagram illustrating the calculation of 34 m / s wind load offset for conventional structures in existing technologies;

[0026] Figure 6 This is a schematic diagram for calculating the 34m / s wind load offset of the wind-resistant support structure in this application.

[0027] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0028] Explanation of icon numbers:

[0029] 10. Upper insulator assembly; 20. Lower insulator assembly; 30. Top connecting mechanism; 40. Middle wind-resistant mechanism; 410. Connecting beam; 420. Connecting seat; 421. Upper connecting plate; 422. Lower connecting plate; 423. Circular support; 424. Through hole; 425. Bolt hole; 430. Vertical support plate; 50. Base mechanism; 510. Bottom cross brace; 520. Base; 60. Contact mechanism. Detailed Implementation

[0030] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0034] Please see the appendix Figure 1-6 The wind-resistant support structure of an 800kV three-column triangular DC disconnector provided in one embodiment of this utility model includes an upper insulator assembly 10, a lower insulator assembly 20, and a top connecting mechanism 30, a middle wind-resistant mechanism 40, and a base mechanism 50 arranged sequentially from top to bottom. The specific scheme is as follows:

[0035] The upper insulator assembly 10 is connected between the top connecting mechanism 30 and the intermediate wind-resistant mechanism 40, and the lower insulator assembly 20 is connected between the base mechanism 50 and the intermediate wind-resistant mechanism 40. Both the upper insulator assembly 10 and the lower insulator assembly 20 include three insulators arranged in a triangular shape. The intermediate wind-resistant mechanism 40 includes a connecting beam 410 and three connecting seats 420 arranged in a triangular shape. The top of each connecting seat 420 is connected to an insulator of the upper insulator assembly 10, and the bottom of each connecting seat 420 is connected to an insulator of the lower insulator assembly 20. Every two connecting seats 420 are connected by the connecting beam 410, and each connecting seat 420 also has a built-in vertical support assembly for improving structural rigidity.

[0036] Specifically, this application is mainly applied to the three-post insulator combined support structure of an 800kV DC disconnector. The typical three-post insulator combined support structure of an 800kV DC disconnector consists of an upper insulator assembly 10 and a lower insulator assembly 20, which are connected only by bolts. Because of this high insulator height, it is prone to significant swaying and shaking under strong wind loads, severely affecting the long-term reliable operation of the equipment. Therefore, this application adopts a structure that integrates a top connecting mechanism 30, a middle wind-resistant mechanism 40, a base mechanism 50, and the upper and lower insulator assemblies 10 and 20 to improve wind resistance. The base mechanism 50 serves as the bottom support, the top connecting mechanism 30 is used for the installation and connection of the disconnector's conductive structure (contact mechanism 60), and the middle wind-resistant mechanism 40 is used for the connection between the upper and lower insulator assemblies 10 and 20, thus binding the three insulators together and improving wind resistance.

[0037] The intermediate wind-resistant mechanism 40 includes a connecting beam 410 and three connecting seats 420. Since the three insulators of an 800kV DC disconnector are usually arranged in a triangular pattern, the three connecting seats 420 are also triangularly distributed to correspond to the insulators. Each connecting seat 420 is connected to an insulator, with the top end for the insulator of the upper insulator assembly 10 and the bottom end for the insulator of the lower insulator assembly 20. After connection, the connecting beam 410 further reinforces the connection between every two connecting seats 420 to improve the overall connection integrity and thus significantly improve the overall structural rigidity, compensating for the weak wind resistance of the middle connection section. Furthermore, each connecting seat 420 also has a built-in vertical support assembly to improve vertical rigidity, thereby complementing the connecting beam 410 to improve both horizontal and vertical rigidity, enhancing wind resistance performance through increased connection rigidity.

[0038] In a preferred embodiment of this utility model, each of the connecting seats 420 includes an upper connecting plate 421, a lower connecting plate 422, and an annular support 423. The annular support 423 is connected between the upper connecting plate 421 and the lower connecting plate 422, and both the upper connecting plate 421 and the lower connecting plate 422 are provided with through holes 424 arranged coaxially with the annular support 423. The vertical support assembly is connected to the outside of the annular support 423 and supported between the upper connecting plate 421 and the lower connecting plate 422.

[0039] It should be noted that the structure using the upper connecting plate 421 and the lower connecting plate 422 increases the vertical width of the cross-section to create an installation space. This allows for the addition of a sufficiently thick connecting beam 410 and vertical support assembly, thereby enhancing structural rigidity. When the connecting beam 410 is connected, the ends of the connecting beam 410 and the vertical support assembly are both connected within this installation space (i.e., between the upper connecting plate 421 and the lower connecting plate 422). Simultaneously, the vertical support assembly is also connected to the annular support 423 to ensure overall rigidity. The annular support 423 connects the upper connecting plate 421 and the lower connecting plate 422. 422 serves as a support between the connecting plates. It's worth noting that disconnect switches typically use a control mechanism to operate a bearing rod, which rotates the contact piece to open and close the switch. Therefore, it's designed as a ring structure to allow the bearing rod of the control mechanism to pass through. Simultaneously, corresponding through holes 424 need to be provided on the upper connecting plate 421 and the lower connecting plate 422 to allow the bearing rod to pass through. Here, "correspondingly provided" means that the through hole 424 is coaxial with the ring support 423. The diameter of the through hole 424 can be smaller than that of the ring support 423, just enough to allow the bearing rod to pass through.

[0040] In a preferred embodiment of the present invention, the vertical support assembly includes a plurality of vertical support plates 430 arranged circumferentially along the annular support 423. One end of each vertical support plate 430 is connected to the side wall of the annular support 423, and the annular support 423 is supported between the upper connecting plate 421 and the lower connecting plate 422.

[0041] It is worth noting that the use of vertical support plate 430 can significantly improve the overall connection between upper connecting plate 421 and lower connecting plate 422, while forming a rigid frame. When operating the opening and closing of the switch, the top contact mechanism 60 will generate a rotational torque, part of which will be transmitted downward through the insulator. Thus, the structural system formed by vertical support plate 430, connecting seat 420 and connecting beam 410 can effectively resist the torsional and bending stress generated by these operating forces, prevent excessive deformation or even breakage at the root of the insulator or the connecting plate, and withstand the lateral load generated by wind. This significantly improves the structure's resistance to lateral displacement and overturning in the horizontal direction, ensuring the stability of the switch in severe weather.

[0042] In a preferred embodiment of the present invention, the connecting beam 410 is made of I-beam, and the end of the connecting beam 410 is embedded between the upper connecting plate 421 and the lower connecting plate 422 of the connecting seat 420.

[0043] It is worth noting that I-beams have good rigidity and stability, and are lightweight and have high load-bearing capacity. The flange plate is easy to process and connect, while the web plate increases the cross-sectional thickness and rigidity, thereby enhancing the wind load offset stiffness of the entire intermediate wind-resistant structure 40.

[0044] In a preferred embodiment of the present invention, the base mechanism 50 includes a bottom cross brace 510 and three bases 520 arranged in a triangular shape. Each base 520 is connected to an insulator of the lower insulator assembly 20. Every two bases 520 are connected by the bottom cross brace 510.

[0045] It is worth noting that the base mechanism 50 adopts a form corresponding to the three-post insulator of the 800kV DC disconnector switch. The three bases 520 are distributed in a triangular shape to connect to the insulator of a lower insulator assembly 20 respectively. At the same time, in order to ensure the stability of the bottom support, the bottom cross brace 510 can be added to stabilize the bases 520, so that every two bases 520 are connected by the bottom cross brace 510.

[0046] It is worth mentioning that the top connection mechanism 30 uses a conventional bearing base for the contact mechanism 60 to be installed and connected. Each upper insulator assembly 10 has a corresponding bearing base connected to the top of the insulator, and a top cross brace can be added between every two bearing bases to simultaneously enhance the overall rigidity of the structure.

[0047] Furthermore, the outer ends of the upper connecting plate 421 and the lower connecting plate 422 are arranged in an arc shape.

[0048] It should be noted that the outer end here refers to the end of each connecting plate that is far from the center of the entire intermediate wind-resistant mechanism 40 (triangle). It is set in an arc shape to take advantage of its streamlined characteristics, which can effectively guide the airflow, reduce the turbulence and separation of the airflow, thereby reducing the wind pressure. By optimizing the aerodynamic shape, the intensity of the wind load is reduced.

[0049] Furthermore, both the upper connecting plate 421 and the lower connecting plate 422 are provided with a plurality of bolt holes 425 spaced apart along the circumference of the annular support 423. The bottom end of the insulator of the upper insulator assembly 10 is connected to the upper connecting plate 421 by bolts, and the top end of the insulator of the lower insulator assembly 20 is connected to the lower connecting plate 422 by bolts.

[0050] It should be understood that bolt holes 425 are provided to facilitate bolt connection between the insulator and the connecting plate, which makes disassembly and assembly convenient and also facilitates later maintenance. When bolt holes 425 are provided, they can be staggered from vertical support plates 430 to prevent bolt connections from penetrating into vertical support plates 430 and causing damage.

[0051] Furthermore, the end of the connecting beam 410 is connected to the upper connecting plate 421 and the lower connecting plate 422 of the connecting seat 420 by welding.

[0052] It should be noted that, considering that the connecting beam 410 is made of I-beam, the connection method of welding provides good rigidity and is easy to operate, and the overall rigidity is strong after welding.

[0053] Furthermore, the vertical support assembly contains six vertical support plates 430, which are arranged at circumferential intervals along the annular support 423.

[0054] It should be noted that the vertical support plate 430 should not be arranged to completely surround the entire annular support 423. Space should be reserved on the inner side (towards the center of the triangle) to facilitate the insertion and welding of the connecting beam 410. The remaining vertical supports can be equidistantly connected around the outside of the annular support 423. Preferably, the number of vertical support plates 430 in the vertical support assembly in this application is six. Those skilled in the art can set the number according to actual needs.

[0055] This application also provides an 800kV three-post DC disconnector, including a contact mechanism 60 and a wind-resistant support structure for the 800kV three-post DC disconnector as described above, wherein the contact mechanism 60 is connected to the top connection mechanism 30 of the wind-resistant support structure.

[0056] It is understood that disconnecting switches typically achieve closing by rotating the moving contact to connect with the stationary contact, and opening by rotating it to separate the contact plates. This is well-known to those skilled in the art, and therefore will not be described in detail here. After the contact mechanism 60 is installed and connected to the top connecting mechanism 30 of the wind-resistant support structure, the stiffness of the wind load offset resistance can be significantly improved under the action of the entire wind-resistant support structure. It does not require the addition of new insulators, and the wind-facing area is almost unchanged. It can improve the wind load offset resistance of the 800kV DC disconnecting switch by up to 4 times without increasing the cost of insulators or the windward area, which has great technical and economic advantages. For example, in one embodiment, under a wind speed of 34m / s, the swing of the contact mechanism 60 of the moving side insulation support structure of a conventional 800kV DC disconnecting switch is calculated to be 83mm. However, in this application, under the same wind load conditions, the top offset is reduced from the conventional 83mm to 20mm, which is a significant effect. Please refer to the appendix for details. Figure 5 ~Attached Figure 6 .

[0057] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A wind-resistant support structure for an 800kV three-column triangular DC disconnector, characterized in that, It includes an upper insulator assembly, a lower insulator assembly, and a top connecting mechanism, a middle wind-resistant mechanism, and a base mechanism arranged sequentially from top to bottom at intervals; among which, The upper insulator assembly is connected between the top connecting mechanism and the middle wind-resistant mechanism, and the lower insulator assembly is connected between the base mechanism and the middle wind-resistant mechanism. Both the upper insulator assembly and the lower insulator assembly include three insulators arranged in a triangular shape. The intermediate wind-resistant mechanism includes a connecting beam and three connecting seats arranged in a triangular shape. The top of each connecting seat is connected to an insulator of the upper insulator assembly, and the bottom of each connecting seat is connected to an insulator of the lower insulator assembly. Every two connecting seats are connected by the connecting beam, and each connecting seat also has a built-in vertical support assembly for improving structural rigidity.

2. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 1, characterized in that, Each of the connecting seats includes an upper connecting plate, a lower connecting plate, and an annular support. The annular support is connected between the upper connecting plate and the lower connecting plate, and both the upper connecting plate and the lower connecting plate have through holes arranged coaxially with the annular support. The vertical support assembly is connected to the outside of the annular support and supported between the upper connecting plate and the lower connecting plate.

3. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 2, characterized in that, The vertical support assembly includes a plurality of vertical support plates arranged circumferentially along the annular support. One end of each vertical support plate is connected to the side wall of the annular support, and the annular support is supported between the upper connecting plate and the lower connecting plate.

4. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 3, characterized in that, The connecting beam is made of I-beam, and the end of the connecting beam is embedded between the upper connecting plate and the lower connecting plate of the connecting seat.

5. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 1, characterized in that, The base mechanism includes a bottom cross brace and three bases arranged in a triangular shape. Each base is connected to an insulator of the lower insulator assembly, and every two bases are connected by the bottom cross brace.

6. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 2, characterized in that, The outer ends of the upper connecting plate and the lower connecting plate are arranged in an arc shape.

7. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 2, characterized in that, Both the upper connecting plate and the lower connecting plate have multiple bolt holes spaced circumferentially along the annular support. The bottom end of the insulator of the upper insulator assembly is connected to the upper connecting plate by bolts, and the top end of the insulator of the lower insulator assembly is connected to the lower connecting plate by bolts.

8. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 4, characterized in that, The end of the connecting beam is connected to the upper and lower connecting plates of the connecting seat by welding.

9. The wind-resistant support structure of the 800kV three-column triangular DC disconnector according to claim 3, characterized in that, The vertical support assembly comprises six vertical support plates, which are arranged at circumferential intervals along the annular support.

10. An 800kV three-post DC disconnector, comprising a contact mechanism, characterized in that, It also includes a wind-resistant support structure for an 800kV three-column DC disconnector as described in any one of claims 1-9, wherein the contact mechanism is connected to the top connection mechanism of the wind-resistant support structure.

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