Direct-current high-speed switch

Abstract

The utility model relates to the technical field of high-voltage switches with arc extinguishing or arc preventing devices, in particular to a direct-current high-speed switch. A direct-current high-speed switch comprises a support, a sealed cylinder is arranged on the support, the sealed cylinder is provided with a sealed inner cavity used for being filled with insulating gas, a movable contact and a static contact are oppositely arranged in the sealed inner cavity, an operating mechanism for driving the movable contact and the static contact to be switched on and switched off is connected to the sealed cylinder, and a wire inlet and outlet structure connected with the movable contact and the static contact respectively is arranged on the sealed cylinder. The moving contact and the static contact are arranged in the sealed cylinder filled with the insulating gas, so that the whole direct-current high-speed switch can reduce the height of a product and the distance between the operating mechanism and the moving contact and the static contact, thereby shortening the length of an insulating pull rod of a transmission system, improving the operation reliability, reducing the production and maintenance cost of the product, widening the applicability of the product, and being suitable for popularization and application. And the method has relatively high economical efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switches with arc extinguishing or arc protection devices, in particular to a direct current high-speed switch. Background Art

[0002] Multi-terminal DC transmission technology has the advantages of stronger transmission capacity and more flexible operation mode, which can effectively solve the problem of multi-power supply and multi-point power transmission. It is a key technical means to solve the shortage of transmission corridors and large-scale clean energy grid connection in my country. With the development of DC transmission technology, it will develop from the initial end-to-end to the current multi-terminal DC, and will also realize a solid DC grid or AC / DC hybrid grid in the future.

[0003] In UHV multi-terminal DC transmission projects, two methods are generally used to quickly isolate the fault line area: one is to install a high-voltage DC circuit breaker, and the other is to use a DC high-speed switch and a converter valve. Since high-voltage DC circuit breakers use a large number of high-power power electronic devices and isolation power supply devices, they have a complex structure, large size, difficult operation and maintenance technology, and high cost, which makes large-scale engineering applications difficult.

[0004] In contrast, the structure of DC high-speed switches is relatively simple, with the characteristics of short response time and fast opening and closing speed, convenient operation and maintenance, and excellent economic performance. By coordinating with the unlocking operation mode and strategy of the converter valve, the third station of the multi-terminal DC system can be put into operation and withdrawn online and the DC line fault can be isolated at high speed. However, the current DC high-speed switches, such as the T-shaped column structure disclosed in the application publication number CN115331989A, have a product size of more than ten meters, which makes the insulation rod of the transmission system long, resulting in large motion mass, low reliability, and high product production and maintenance costs. Utility Model Content

[0005] The utility model aims to provide a DC high-speed switch, which is used to solve the problems that the existing DC high-speed switch adopts a T-shaped column structure, and because the product size is as high as more than ten meters, the insulating pull rod of the transmission system is long, resulting in large motion mass, low reliability, and high product production and maintenance costs.

[0006] The utility model adopts the following technical scheme: a DC high-speed switch, including a bracket, on which a sealed cylinder is arranged, the sealed cylinder has a sealed inner cavity for filling insulating gas, and moving and static contacts are relatively arranged in the sealed inner cavity, an operating mechanism for driving the moving and static contacts to open and close is connected to the sealed cylinder, and an inlet and outlet line structure respectively connected to the moving and static contacts is arranged on the sealed cylinder.

[0007] Furthermore, the sealing cylinder is horizontally arranged on the bracket.

[0008] Furthermore, the sealing cylinder comprises a moving end cylinder and a stationary end cylinder, and the two sections of the cylinder are a split butt joint structure.

[0009] Furthermore, at least one section of the cylinder is arranged to be guided and slidable along the docking direction.

[0010] Furthermore, the bracket includes a base and legs installed on the base, and the two sections of the cylinder are installed on the base through corresponding legs. The base is provided with a guide rail, and the movable section of the cylinder is guided and slid through the corresponding legs and the guide rail.

[0011] Furthermore, the static end cylinder is slidingly arranged on the bracket, the dynamic end cylinder is fixed on the bracket, and one end of the dynamic end cylinder away from the static end cylinder is connected to the operating mechanism.

[0012] Furthermore, the inlet and outlet line structure is arranged on the top of the sealing cylinder and extends upward.

[0013] Furthermore, an observation window is provided on the sealing cylinder at the joint between the moving and static contacts.

[0014] The DC high-speed switch of the utility model is a new type of DC high-speed switch. The beneficial effect of the DC high-speed switch of the utility model is: by arranging the moving and static contacts in a sealed cylinder filled with insulating gas, the height of the entire DC high-speed switch can be reduced, and the distance between the operating mechanism and the moving and static contacts is reduced, thereby shortening the length of the insulating pull rod of the transmission system, improving the operational reliability, and at the same time reducing the product production and maintenance costs, broadening the product applicability, and having higher economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a DC high-speed switch of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the observation window of the DC high-speed switch of the utility model.

[0017] In the figure: 1. Inlet terminal; 2. Outlet terminal; 3. Static end cylinder; 4. Moving end cylinder; 5. Observation window; 6. Operating mechanism; 7. Base; 8. Guide rail; 51. Annular flange; 52. Bolt hole; 53. Transparent window. DETAILED DESCRIPTION

[0018] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0019] First, the technical solution of the utility model is generally described as follows:

[0020] Multi-terminal DC transmission technology is widely used because of its advantages such as stronger transmission capacity and more flexible operation mode. At present, in ultra-high voltage multi-terminal DC transmission projects, in order to achieve rapid isolation of fault line areas, a method of directly installing high-voltage DC circuit breakers is adopted. However, since high-voltage DC circuit breakers use a large number of high-power power electronic devices and isolation energy supply devices, their structure is complex, the size is large, the operation and maintenance technology is difficult, and the cost is high, there are certain difficulties in large-scale engineering applications.

[0021] Therefore, there is also a method of using a DC high-speed switch and a converter valve to cooperate with each other. The DC high-speed switch has a relatively simple structure, has the characteristics of short response time and fast opening and closing speed, is easy to operate and maintain, and has excellent economic performance. By coordinating with the converter valve unlocking operation mode and strategy, the third station of the multi-terminal DC system can be put into operation and withdrawn online and the DC line fault can be isolated at high speed. However, the current DC high-speed switch, such as the T-shaped column structure disclosed in the application publication number CN115331989A, has a product size of more than ten meters, which makes the insulation rod of the transmission system long, resulting in large motion mass, low reliability, and high product production and maintenance costs.

[0022] The utility model designs a novel DC high-speed switch based on the above-mentioned problems, and specifically adopts the following technical solutions: a DC high-speed switch, including a bracket, a sealed cylinder is arranged on the bracket, the sealed cylinder has a sealed inner cavity for filling insulating gas, the moving and static contacts are arranged in the sealed cylinder filled with insulating gas, and the sealed cylinder is provided with an inlet and outlet line structure respectively connected to the moving and static contacts, so that the height of the entire DC high-speed switch can be reduced, and an operating mechanism for driving the moving and static contacts to open and close is connected to the sealed cylinder, so that the distance between the operating mechanism and the moving and static contacts is reduced, thereby shortening the length of the insulating pull rod of the transmission system, while improving the operational reliability, reducing the product production and maintenance costs, broadening the applicability of the product, and having high economy.

[0023] Specific embodiments of the DC high-speed switch of the utility model:

[0024] The structural schematic diagram of the DC high-speed switch of the utility model is as follows Figure 1 As shown, a DC high-speed switch includes a bracket, which is arranged on the ground. A sealed cylinder is arranged on the bracket. The sealed cylinder has a sealed inner cavity, and the sealed inner cavity is filled with insulating gas. The insulating gas makes the sealed cylinder have better insulation performance, so that it does not need to be placed in the air like the column structure in the prior art. Moving and static contacts are relatively arranged in the sealed inner cavity. An operating mechanism 6 is connected to the sealed cylinder. The operating mechanism 6 drives the moving and static contacts to open and close. The sealed cylinder is provided with input and output line structures respectively connected to the moving and static contacts to realize the power transmission project.

[0025] In order to make the structure easier to install and maintain, preferably, the sealing cylinder is horizontally arranged on the bracket. First, the horizontal arrangement makes the force of the structure evenly distributed in the horizontal direction, and the structure is more stable. In addition, such an arrangement can make the overall structure lower to the ground, which is convenient for installation and maintenance and easy to operate. Of course, in other embodiments, when the horizontal space on the ground is limited, the sealing cylinder can also be arranged vertically, so that it is arranged lower from the operating mechanism 6 and one end of the moving contact, which can also ensure that the insulating pull rod of the transmission system is shorter and reliable.

[0026] One end of the sealing cylinder is the moving end cylinder 4, and the other end is the static end cylinder 3. In order to facilitate processing, installation and maintenance, in this embodiment, preferably, the moving end cylinder 4 and the static end cylinder 3 are set as a split docking structure, so that the moving and static contacts are processed and manufactured separately, which is convenient to manufacture, and the installation and maintenance are easy to operate by disassembling from the middle, which reduces the processing difficulty and cost, and facilitates product installation and maintenance. Of course, in other embodiments, the sealing cylinder can also be set as an integrated structure, and a detachable structure can be set at the connection with the operating structure, and the operating structure can be disassembled for maintenance when disassembly is required; or a cylinder cover is set at the end of the sealing cylinder, and the cylinder cover can be disassembled for installation and maintenance during use.

[0027] During the disassembly, separation and installation, at least one end of the moving end cylinder 4 and the static end cylinder 3 needs to be moved for operation. In order to simplify the structure and save costs, the conventional method is to fix the moving end cylinder 4 and the static end cylinder 3 on the bracket, and they can be manually moved during disassembly and installation. However, this method is time-consuming and labor-intensive. Therefore, in order to facilitate the operation and save labor, preferably, at least one section of the cylinder is guided and slidable along the docking direction. In this way, during installation and maintenance, the moving end cylinder 4 or the static end cylinder 3 can be guided and slid along the docking direction, which saves labor and can conveniently realize the separation and docking of the moving end cylinder 4 and the static end cylinder 3.

[0028] When considering how to set the structure of the bracket, in order to achieve structural stability and better realize the guide sliding setting of the movable section of the cylinder, the bracket preferably includes a base 7, which is placed on the ground to ensure the stability of the structure. A plurality of legs are installed on the base 7. The static end cylinder 3 and the movable end cylinder 4 are both installed on the base 7 through corresponding legs. In this embodiment, the static end cylinder 3 and the movable end cylinder 4 are respectively configured with two legs, so that the static end cylinder 3 and the movable end cylinder 4 are structurally stable and easy to separate. A guide rail 8 is provided on the base 7, and the movable cylinder slides through the corresponding legs and the guide rail 8. The guide rail 8 has a simple structure and is easy to set. When in use, the movable cylinder can be pulled to move along the guide rail 8. Of course, in other embodiments, guide rails 8 are provided on two of the legs, and the static end cylinder 3 or the movable end cylinder 4 is guided and slid on the guide rails 8 on the legs, driving the movable section of the cylinder to dock and move away along the docking direction.

[0029] Specifically, in this embodiment, preferably, the static end cylinder 3 is set on the bracket for guiding sliding, the dynamic end cylinder 4 is fixed on the bracket, and the end of the dynamic end cylinder 4 away from the static end cylinder 3 is connected to the operating mechanism 6, so that the static end cylinder 3 has a simple structure, is easy to move and saves effort, and the operating mechanism 6 is installed on the end of the dynamic end cylinder 4 away from the static end cylinder 3. The overall structure is compact, so that the distance between the insulating pull rod of the operating mechanism 6 and the moving contact is short. Of course, in other embodiments, the dynamic end cylinder 4 and the static end cylinder 3 can be guided to slide on the bracket through different guide rails, or the static end cylinder 3 is fixed on the bracket and the dynamic end cylinder 4 is guided to slide on the bracket through a slide rail.

[0030] Since the incoming and outgoing line structure is energized, in order to improve safety, it is preferred that the incoming and outgoing line structure is arranged at the top of the sealed cylinder and extends upward. Specifically, the incoming and outgoing line structure includes an incoming line terminal 1 and an outgoing line terminal 2, both of which are in the form of a conductive rod and a composite insulating sleeve. The conductive rod is vertically extended upward and is located on the upper side of the sealed cylinder to ensure a certain degree of safety. The conductive rod is provided with a composite insulating sleeve, and the insulating sleeve is an umbrella skirt structure, so that the overall length of the incoming line terminal 1 and the outgoing line terminal 2 is short, thereby ensuring the creepage distance. The incoming line terminal 1 and the outgoing line terminal are light in weight and easy to transport and install. Of course, in other embodiments, under the condition of ensuring good insulation externally, the incoming line terminal 1 and the outgoing line terminal can also be respectively arranged on both sides or the lower side of the static end cylinder 3 and the dynamic end cylinder 4, so that the cables connected to the incoming line terminal 1 and the outgoing line terminal are grounded to ensure safety.

[0031] In this embodiment, Figure 2 As shown, an observation window 5 is provided on the sealing cylinder at the joint between the moving and static contacts. Specifically, the observation window 5 is arranged on the side of the static end cylinder 3 close to the moving end cylinder 4. The observation window 5 includes an annular flange 51. Bolt holes 52 for assembling with the flange on the static end cylinder 3 are evenly arranged on the annular flange 51. The center of the annular flange 51 is an annular transparent window 53, which can monitor the breaking process of the moving and static contacts in real time, evaluate the aging degree of the key components of the fracture, and facilitate product maintenance and repair.

[0032] The base 7 of the present embodiment is specifically configured as a skid-mounted base, the guide rails 8 and the legs are mounted on the skid-mounted base, the sealing cylinder is mounted on the legs, and the overall structure forms a DC high-speed switch module, which is convenient for movement, disassembly, installation and other operations.

[0033] When the DC high-speed switch of the utility model is assembled and used, the operating mechanism 6 drives the moving contact to move through the insulating pull rod to realize the disconnection and closing of the moving and static contacts. When disassembly and maintenance are required, the static end cylinder 3 is moved along the guide slide rail 8 to separate the static end cylinder 3 and the moving end cylinder 4, and maintenance and other operations are carried out. The breaking process of the moving and static contacts is observed through the observation window 5, so that the breaking operation and the observation of parts can be realized.

[0034] Through the above description of the specific embodiments of the DC high-speed switch of the utility model, it can be seen that the DC high-speed switch of the utility model arranges the moving and static contacts in a sealed cylinder filled with insulating gas, so that the overall structure can reduce the product height, and the distance between the operating mechanism and the moving and static contacts is reduced, thereby shortening the length of the insulating pull rod of the transmission system, improving operational reliability, and at the same time reducing the product production and maintenance costs, broadening the product applicability, and having high economy.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A DC high-speed switch, characterized in that: The invention comprises a bracket, on which a sealing cylinder is arranged, the sealing cylinder has a sealed inner cavity for filling insulating gas, in which moving and static contacts are arranged relatively to each other, an operating mechanism for driving the moving and static contacts to open and close is connected to the sealing cylinder, and an inlet and outlet line structure respectively connected to the moving and static contacts is arranged on the sealing cylinder.

2. The DC high-speed switch according to claim 1, characterized in that: The sealing cylinder is horizontally arranged on the bracket.

3. The DC high-speed switch according to claim 2, characterized in that: The sealing cylinder comprises a moving end cylinder and a static end cylinder, and the two sections of the cylinder are a split butt joint structure.

4. The DC high-speed switch according to claim 3, characterized in that: At least one section of the cylinder is arranged to be guided and slidable along the butting direction.

5. The DC high-speed switch according to claim 4, characterized in that: The bracket includes a base and legs installed on the base, two sections of the cylinder are installed on the base through corresponding legs, a guide rail is provided on the base, and a movable section of the cylinder is guided and slid through the corresponding legs and the guide rail.

6. The DC high-speed switch according to claim 4, characterized in that: The static end cylinder is slidingly arranged on the bracket, the dynamic end cylinder is fixed on the bracket, and one end of the dynamic end cylinder away from the static end cylinder is connected with an operating mechanism.

7. The DC high-speed switch according to claim 2, characterized in that: The inlet and outlet wire structure is arranged on the top of the sealing cylinder and extends upward.

8. The DC high-speed switch according to any one of claims 1 to 7, characterized in that: An observation window is arranged on the sealing cylinder at the joint of the moving and static contacts.

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