Gas insulated switchgear

Abstract

A gas insulated switch device comprises a first spacing unit and a second spacing unit, the first spacing unit and the second spacing unit respectively comprise a first accommodating shell, a second accommodating shell and a third accommodating shell which correspond to each other, and the first accommodating shell, the second accommodating shell and the third accommodating shell have at least partially identical structures; the first accommodating shell comprises a circuit breaker control mechanism, the second accommodating shell is filled with insulating gas and comprises a circuit breaker and an isolation grounding switch, and the third accommodating shell comprises a cable terminal used for being connected with a cable; the first accommodating shell is arranged above the second accommodating shell, the third accommodating shell is adjacent to the second accommodating shell and is arranged on at least one side of the second accommodating shell, and the first spacing unit is detachably connected with the second spacing unit. The design is beneficial to installation and maintenance, parts can be exchanged, universally used and reused, meanwhile, design verification and production manufacturing are facilitated, and the research and development and production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of current collector system switch configuration technology, and in particular to gas-insulated switchgear. Background Technology

[0002] The statements in this section are merely to provide background information related to this utility model to aid in understanding it, and this background information does not necessarily constitute prior art.

[0003] With the booming development of offshore wind power, the configuration of the power collection system switch for offshore wind turbine towers is crucial. Currently, there are three main configuration options for power collection systems: traditional switch configuration, partial switch configuration, and fully switched configuration. In the partial and fully switched configuration options, the switchgear can be circuit breakers, load switches, or remotely controllable disconnect switches.

[0004] Load switches or disconnectors are widely used in the market due to their relatively low cost. However, when a submarine cable fails, using load switches or disconnectors as switches on the collector line requires remotely disconnecting the load switch or disconnector before the fault point after the circuit breaker at the beginning of the collector line has been opened, and then closing the circuit breaker at the beginning of the collector line to restore power. During this process, the wind turbines before the fault point need to temporarily stop receiving power, which not only affects the power generation efficiency of the wind farm but may also cause unnecessary damage to the wind turbine equipment.

[0005] In addition, since all faults on the collecting submarine cable require the circuit breaker at the beginning of the collecting line to be interrupted, the electrical life of the circuit breaker at the beginning is under great pressure, which further increases the difficulty and cost of system maintenance. Utility Model Content

[0006] Therefore, the purpose of this utility model is to overcome the defects of the prior art and provide a gas-insulated switchgear, comprising: a first compartment unit including a first housing, a second housing, and a third housing; a second compartment unit including a first housing, a second housing, and a third housing; wherein the first housing, the second housing, and the third housing of the first compartment unit have at least partially the same structure as the first housing, the second housing, and the third housing of the second compartment unit; the first housing includes a circuit breaker control mechanism, the second housing is filled with insulating gas and includes a circuit breaker and an isolating grounding switch, wherein the circuit breaker and the isolating grounding switch in the first compartment unit are connected in series between a cable terminal and a first intermediate node, the circuit breaker in the second compartment unit is connected in series with the isolating grounding switch via a second intermediate node between two cable terminals, and the third housing includes a cable terminal for connecting a cable; the first housing is disposed above the second housing, and the third housing is disposed adjacent to the second housing on at least one side of the second housing, and the first compartment unit and the second compartment unit are detachably connected by connecting the first intermediate node and the second intermediate node.

[0007] In some embodiments, preferably, the first receiving housing, the second receiving housing, and the third receiving housing of the first spacer unit have the same structure as the first receiving housing, the second receiving housing, and the third receiving housing of the second spacer unit.

[0008] In some embodiments, preferably, the number of the third housing is at least one, and corresponds one-to-one with the number of cable outlet directions.

[0009] In some embodiments, preferably, the first spacer unit further includes a fourth housing, the fourth housing including control devices for the gas-insulated switchgear, the fourth housing being disposed on one side of the second housing of the first spacer unit, the fourth housing having at least partially the same structure as the third housing at a corresponding position in the second spacer unit.

[0010] In some embodiments, preferably, the third housing has a wiring port, the first spacer unit and the second spacer unit are connected by a cable, and the wiring port of the third housing of the first spacer unit is connected to the wiring port of the third housing of the second spacer unit through the cable.

[0011] In some embodiments, preferably, the first intermediate node and the second intermediate node are configured as the cable terminals, the first spacer unit and the second spacer unit are connected by a cable, the first spacer unit has two third housings, and the second spacer unit has three third housings.

[0012] In some embodiments, preferably, the two third receiving shells of the first spacer unit are arranged adjacent to each other on the same side of the second receiving shell, the two third receiving shells of the second spacer unit are arranged adjacent to each other on the same side of the second receiving shell, and the other third receiving shell of the second spacer unit is arranged on the other side of the second receiving shell.

[0013] In some embodiments, preferably, one of the second housing of the first spacer unit and the second housing of the second spacer unit is further provided with a connecting flange, and the other is further provided with a connecting conductor, wherein the connecting flange serves as one of the first intermediate node and the second intermediate node, and the connecting conductor serves as the other of the first intermediate node and the second intermediate node.

[0014] In some embodiments, preferably, the first spacer unit has one third receiving housing, and the second spacer unit has two third receiving housings. The third receiving housing of the first spacer unit is disposed in a first portion space on one side of the second receiving housing of the first spacer unit, and the third receiving housing of the second spacer unit is disposed in a second portion space on one side of the second receiving housing of the second spacer unit, such that when the first spacer unit and the second spacer unit are connected, the first portion space and the second portion space can be combined and disposed on one side of the second receiving housing.

[0015] In some embodiments, preferably, the second housing is filled with clean air.

[0016] Compared with the prior art, the advantages of this utility model are: (1) The use of this structural design, which is at least partially identical, is conducive to installation and maintenance, enables interchangeability and reuse of parts, and facilitates design verification and manufacturing, thereby reducing R&D and production costs; (2) Using clean gas as the insulating medium results in lower greenhouse gas emissions, reducing the impact on the environment. In addition, no gas operation is required during on-site installation, reducing installation difficulty and risk and improving installation efficiency; (3) Circuit breakers are provided in the first and second bay units respectively, so that in the event of a cable fault, the circuit breaker can disconnect the circuit in a very short time, ensuring that devices before the fault point, such as key devices like fans, do not need to be temporarily shut down, thus avoiding interruptions caused by power outages. (4) The two bay units can be adapted to their respective circuits with different parameters according to different application scenarios and needs, which improves the versatility and adaptability of the gas-insulated switchgear; (5) The cable terminals of the two bay units can be flexibly arranged according to the required cable outgoing direction, and the first bay unit and the second bay unit can be detachably connected, which makes the gas-insulated switchgear assembled by the two bay units more compact, saves space, and is easy to install and lay out in a limited space; (6) The two bay units are detachable, which is conducive to individual maintenance, and can be transported and installed in limited spaces such as wind turbine towers, which improves the flexibility and adaptability of the gas-insulated switchgear. Attached Figure Description

[0017] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a front view of the first bay unit of a gas-insulated switchgear (GIS) device according to an embodiment of the present invention.

[0019] Figure 2 This is a front view of the second bay unit of a gas-insulated switchgear according to an embodiment of the present invention;

[0020] Figure 3 This is a front view of the first bay unit of a gas-insulated switchgear according to another embodiment of the present invention;

[0021] Figure 4 This is a front view of the second bay unit of a gas-insulated switchgear according to another embodiment of the present invention;

[0022] Figure 5 This is an assembly diagram of the cable connection between the first and second compartment units of a gas-insulated switchgear according to an embodiment of the present invention.

[0023] Figure 6 This is an assembly diagram of the cable connection between the first and second compartment units of a gas-insulated switchgear according to another embodiment of the present invention.

[0024] Figure 7 This is an assembly diagram of the cable connection between the first and second compartment units of a gas-insulated switchgear according to another embodiment of the present invention.

[0025] Figure 8 This is an assembly diagram of the cable connection between the first and second compartment units of a gas-insulated switchgear according to another embodiment of the present invention.

[0026] Figure 9 This is an assembly diagram showing the direct connection of the first and second spacer units of a gas-insulated switchgear according to an embodiment of the present invention.

[0027] Figure 10 This is a circuit diagram of the gas-insulated switch device according to the present invention.

[0028] The meanings of the labels in the attached diagram are as follows:

[0029] 1-First housing; 2-Second housing; 3-Third housing; 4-Fourth housing; 5-Cable terminal; 6-Circuit breaker; 7-Isolating grounding switch; 8-Circuit breaker opening / closing indicator; 9-Explosion-proof device; 10-Moving side support insulator; 11-Outer cone insulator; 12-Contact seat; 13-Cable; 14-Static side support insulator; 15-Connecting flange; 16-Connecting conductor; 17-Pressure relief channel; 18-Isolating grounding switch control mechanism; 19-Wiring port; 20-First bay unit; 21-Second bay unit. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "assembly," "assembly," "connection," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] This utility model proposes a gas-insulated switchgear, which generally comprises two modular compartment units, which can be connected by cables (e.g., Figure 1 , 2 (as shown), or directly connected (such as...) Figure 3 , 4(As shown). In general, the gas-insulated switchgear of this invention includes a first compartment unit 20 and a second compartment unit 21. The first compartment unit 20 and the second compartment unit 21 each include a corresponding first receiving housing 1, a second receiving housing 2, and a third receiving housing 3. The first receiving housing 1, the second receiving housing 2, and the third receiving housing 3 of the first compartment unit 20 each have at least partially the same structure as the first receiving housing 1, the second receiving housing 2, and the third receiving housing 3 of the second compartment unit 21. This at least partially identical structural design facilitates installation and maintenance, enables interchangeable and reusable components, and facilitates design verification and manufacturing, reducing R&D and production costs. The first receiving housing 1 includes a circuit breaker control mechanism, and the second receiving housing 2 is filled with clean gas. As an insulating medium, the clean gas has lower greenhouse gas emissions, reducing environmental impact. Furthermore, no gas handling is required during on-site installation, reducing installation difficulty and risk, and improving installation efficiency. The second housing 2 includes a circuit breaker 6 and an isolating grounding switch 7. The circuit breaker 6 and the isolating grounding switch 7 in the first bay unit 20 are connected in series between the cable terminal and the first intermediate node. The circuit breaker 6 in the second bay unit 21 is connected in series with the isolating grounding switch 7 via the second intermediate node. The first intermediate node can be directly connected to the second intermediate node via a connector or via a cable. The first bay unit 20 and the second bay unit 21 each have a circuit breaker 6. The circuit breaker 6 in the first bay unit 20 is used as a circuit breaker on a branch line (e.g., a single offshore wind turbine), and the circuit breaker 6 in the second bay unit 20 is used as a circuit breaker on a main line (e.g., a collector line). Multiple branch lines can be connected to the main line. This allows the circuit breaker to disconnect the circuit in a very short time during a cable fault, ensuring that devices upstream of the fault point, such as critical devices like wind turbines, do not need to lose power, thus avoiding the interruption of the entire line and damage to the devices caused by a power outage. Compared to a configuration where only a circuit breaker is installed at the beginning of the collector line and a disconnecting switch is installed in the middle of the collector line, this utility model uses a circuit breaker as the switch on the collector line, thereby distributing the circuit breaking task to each circuit breaker throughout the entire collector line, significantly reducing the specifications of the circuit breaker used at the beginning. Furthermore, the two bay units can be adapted to their respective circuits with different parameters according to different application scenarios and requirements, improving the versatility and adaptability of the gas-insulated switchgear. The third housing 3 includes a cable terminal 5 for connecting the cable 13. The cable terminals 5 of the two bay units can be flexibly arranged according to the required cable 13 outgoing direction, preferably for convenient internal structural layout. The first housing 1 is located above the second housing 2, and the third housing 3 is located adjacent to the second housing 2 on at least one side of the second housing 2. The first bay unit 20 and the second bay unit 21 are detachably connected.This arrangement places the first and third housings, used for connection and control functions, adjacent to the second housing, which provides the core circuit breaker function. This simplifies the wiring of the gas-insulated switchgear assembled from the two bay units, resulting in a more compact structure, space savings, and easier installation and layout in limited spaces. Furthermore, the two bay units are detachable, facilitating individual maintenance and installation in confined spaces such as wind turbine towers, thus improving the flexibility and adaptability of the gas-insulated switchgear.

[0035] In some embodiments, such as Figure 1-4 As shown, the first receiving housing 1, the second receiving housing 2, and the third receiving housing 3 of the first spacer unit 20 have the same structure as the first receiving housing 1, the second receiving housing 2, and the third receiving housing 3 of the second spacer unit 21. Specifically, the first receiving housing 1 and the second receiving housing 2 of the first spacer unit 20 have the same structure as the first receiving housing 1 and the second receiving housing 2 of the second spacer unit 21. In some embodiments, the third receiving housing 3 of the first spacer unit 20 and the third receiving housing 3 of the second spacer unit 21 can also be designed to have the same structure, as long as the functional requirements for assembly and use between the first spacer unit 20 and the second spacer unit 21 are met. Adopting at least partially identical structural designs for the two spacer units facilitates interchangeability and reuse of components. When the two spacer units are designed with the same parameters, only one spacer unit needs to be verified, which also facilitates manufacturing and reduces R&D and production costs. In this article, "at least partially identical structure" means that the corresponding shells of the first and second spacer units (the first, second, and third housing shells) adopt a standardized design, are produced through the same or mostly the same manufacturing processes (such as shared molds), and only require local processing (such as drilling and welding) to adapt to different functional requirements, ensuring that the core structure is consistent.

[0036] In some embodiments, such as Figure 1-4 As shown, the first housing 1 can accommodate the circuit breaker control mechanism, which is equipped with a circuit breaker open / close indicator 8, which can indicate the operating status of the circuit breaker 6 in real time as either open (disconnecting the circuit) or closed (connecting the circuit). The circuit breaker control mechanism is located adjacent to and above the second housing 2, which includes the circuit breaker 6. This arrangement makes full use of vertical space, significantly shortens the length of the connecting wires, and reduces losses. Furthermore, the location of the circuit breaker control mechanism at the top makes it more convenient for operators to perform debugging, maintenance, and other operations.

[0037] In some embodiments, such as Figure 1-2As shown, the second housing 2 is equipped with an isolating grounding switch control mechanism 18 for controlling the isolating grounding switch 7. The cable terminal 5 is connected to the isolating grounding switch 7 on one side of the isolating grounding switch control mechanism 18 via an outer cone insulator 11. The circuit breaker 6 is connected to the other side of the isolating grounding switch control mechanism 18 via a contact seat 12. This makes the structure of each bay unit more compact and saves space. The second housing 2 is also equipped with a moving-side support insulator 10 and a stationary-side support insulator 14. Specifically, the isolating grounding switch 7 is vertically fixed in the second housing 2 via the moving-side support insulator 10, which is connected above the circuit breaker 6, and the stationary-side support insulator 14 is connected below the circuit breaker 6. In some embodiments, the stationary-side support insulator 14 is connected to the cable terminal 5 via the contact seat 12 and the outer cone insulator 13.

[0038] In some embodiments, such as Figure 1-4 As shown, the number of third housings 3 is at least one, and they correspond one-to-one with the number of cable 13 outlet directions. Specifically, the number of third housings 3 can be flexibly set according to the required number of cable terminals 5, and the number of cable terminals 5 can be flexibly arranged according to the required cable 13 outlet direction, which can avoid phase errors or short circuit risks caused by cross-connection of multiple circuit cables.

[0039] In some embodiments, such as Figure 1-4 As shown, the first partition unit 20 further includes a fourth housing 4, which includes a control device for a gas-insulated switchgear. The fourth housing 4 is disposed on one side of the second housing 2 of the first partition unit 20, and has a structure at least partially identical to that of the third housing 3 at a corresponding position in the second partition unit 21. Preferably, the control device can be a Local Control Panel (LCP), and the first partition unit 20 and the second partition unit 21 can achieve integrated control by sharing a single LCP. In some embodiments, the fourth housing 4 and the third housing 3 at a corresponding position in the second partition unit 21 can have the same or similar shell shape, or the same size of accommodating space, as long as the functional requirements for assembly and use between the first partition unit 20 and the second partition unit 21 are met.

[0040] In some embodiments, such as Figure 1-4As shown, an explosion-proof device 9 in the form of a pressure relief valve is disposed at the top of the second housing 2, where it is not connected to the first housing 1. When gas expands due to arcing within the second housing 2, the explosion-proof device 9 can rapidly and directionally release pressure, preventing the second housing 2 from rupturing or exploding. In some embodiments, the explosion-proof device 9 may also be disposed at other locations within the second housing 2, selected such that, upon pressure release, the shock wave will not affect other equipment of the gas-insulated switchgear or inspection personnel.

[0041] In some embodiments, such as Figure 5-6 As shown, the third housing 3 has a wiring port 19. The first partition unit 20 and the second partition unit 21 are connected by a cable 13. The wiring port 19 of the third housing 3 of the first partition unit 20 is connected to the wiring port 19 of the third housing 3 of the second partition unit 21 through the cable 13. This makes it easy to disassemble the two partition units, which is beneficial for individual maintenance. It also allows for flexible adjustment of the relative positions of the first partition unit 20 and the second partition unit 21 according to the space inside, for example, the wind turbine tower.

[0042] In some embodiments, such as Figure 5-8 As shown, the third housing 3 is provided with a pressure relief channel 17, which is a cable compartment pressure relief channel. Located on the outside of the third housing 3, when the pressure inside the third housing 3 abnormally rises due to arcing, the pressure relief channel 17 can quickly release the excess pressure, thereby ensuring safety. Preferably, two or more third housings 3 located on the same side can share a single pressure relief channel 17, which not only improves the safety and reliability of the device but also simplifies the design and reduces costs.

[0043] In some embodiments, the first intermediate node and the second intermediate node are configured as the cable termination. For example... Figure 5-8 As shown, the first partition unit 20 and the second partition unit 21 are connected by a cable 13. The first partition unit 20 has two third receiving housings 3, and the second partition unit 21 has three third receiving housings 3. By allocating different numbers of third receiving housings 3 to the first partition unit 20 and the second partition unit 21, functional partitioning can be achieved. If it is necessary to add or remove functional modules, this can be achieved by simply adjusting the number of third receiving housings 3.

[0044] In some embodiments, the first spacer unit 20 and the second spacer unit 21 are connected by a cable 13. Preferably, the two third receiving housings 3 of the first spacer unit 20 are arranged adjacent to each other on the same side of the second receiving housing 2, the two third receiving housings 3 of the second spacer unit 21 are arranged adjacent to each other on the same side of the second receiving housing 2, and the other third receiving housing 3 of the second spacer unit 21 is arranged on the other side of the second receiving housing 2. This compact design can save a lot of space and facilitates the interchangeability and reuse of parts. When the two spacer units are designed with the same parameters, only one spacer unit needs to be verified, which also facilitates manufacturing and reduces R&D and production costs.

[0045] In some embodiments, the first intermediate node and the second intermediate node are respectively configured as one and the other of the connecting flange and the connecting conductor. Figure 3-4 As shown, the second housing 2 of the first spacer unit 20 is further provided with a connecting flange 15, and the second housing 2 of the second spacer unit 21 is further provided with a connecting conductor 16. The first spacer unit 20 and the second spacer unit 21 are detachably and directly connected via the connecting flange 15 and the connecting conductor 16. Specifically, the connecting flange 15 is provided with three insulators, with contact seats 12 connected to both sides of the insulators. The connecting conductor 16 is installed on the stationary side support insulator 14, and the other end of the connecting conductor 16 is inserted into the contact seat 12 to achieve conductive connection between the two spacer units (not shown). An assembly diagram showing the direct connection between the first spacer unit 20 and the second spacer unit 21 is shown below. Figure 9 As shown, the two spacer units have a simple structure and can be assembled without the need for cable 13, making the overall device more compact.

[0046] In some embodiments, when the first spacing unit 20 and the second spacing unit 21 are directly connected, such as Figure 3-4 As shown, the first spacer unit 20 has one third receiving housing 3, and the second spacer unit 21 has two third receiving housings 3. The third receiving housing 3 of the first spacer unit 20 is disposed in a first portion of the space on one side of the second receiving housing 2 of the first spacer unit 20, and one third receiving housing 3 of the second spacer unit 21 is disposed in a second portion of the space on one side of the second receiving housing 2 of the second spacer unit 21. This allows the first and second portions of the space to be combined and disposed on one side of the second receiving housing 2 when the first spacer unit 20 and the second spacer unit 21 are connected. This design allows the third receiving housings 3 of the first spacer unit 20 and the third receiving housings 3 of the second spacer unit 21 to be arranged vertically during assembly, making full use of the vertical space and enabling the gas-insulated switchgear to achieve a compact spatial layout.

[0047] In some embodiments, the second housing 2 is filled with clean air. Clean air is a naturally occurring resource, requiring no special preparation process, and conforms to the concept of a circular economy.

[0048] Figure 10 A circuit diagram of a gas-insulated switchgear is shown, where DES1 and DES2 are isolating grounding switches 7, QF1 and QF2 are circuit breakers 6, and DES1 and QF1 are located in the first bay unit 20, while DES2 and QF2 are located in the second bay unit 21. L1, L2, and L3 are cable outlet ports; L1 is used for connection to offshore wind turbines, etc., and L2 and L3 are used for connection to current collector cables. Specifically, L1 is used to connect to the circuit branch where a single wind turbine is located, and L2 and L3 are connected in series in the main circuit that serves as the current collector circuit.

[0049] The gas-insulated switchgear proposed in this utility model includes a first compartment unit 20 and a second compartment unit 21. The first compartment unit 20 and the second compartment unit 21 each include a corresponding first receiving housing 1, a second receiving housing 2, and a third receiving housing 3. The first receiving housing 1, the second receiving housing 2, and the third receiving housing 3 of the first compartment unit 20 each have at least partially the same structure as the first receiving housing 1, the second receiving housing 2, and the third receiving housing 3 of the second compartment unit 21. This at least partially identical structural design facilitates installation and maintenance, enables interchangeable and reusable components, and facilitates design verification and manufacturing, reducing R&D and production costs. The first receiving housing 1 includes a circuit breaker control mechanism, and the second receiving housing 2 is filled with clean gas. As an insulating medium, the clean gas has lower greenhouse gas emissions, reducing environmental impact. Furthermore, no gas handling is required during on-site installation, reducing installation difficulty and risk, and improving installation efficiency. The second housing 2 includes a circuit breaker 6 and an isolating grounding switch 7. The circuit breaker 6 and the isolating grounding switch 7 in the first bay unit 20 are connected in series between the cable terminal and the first intermediate node. The circuit breaker 6 in the second bay unit 21 is connected in series with the isolating grounding switch 7 via the second intermediate node between the two cable terminals. The circuit breaker 6 is installed in both the first bay unit 20 and the second bay unit 21. This allows the circuit breaker to disconnect the circuit in a very short time during a cable fault, ensuring that critical devices upstream of the fault point, such as fans, do not experience a brief power outage, thus avoiding interruptions and device damage caused by power outages and improving the service life of the circuit breaker. Furthermore, the two bay units can be adapted to different circuits with different parameters according to different application scenarios and requirements, improving the versatility and adaptability of the gas-insulated switchgear. The third housing 3 includes cable terminals 5 for connecting cables 13. The cable terminals 5 of the two bay units can be flexibly arranged according to the required cable 13 outgoing direction, preferably for convenient internal structural layout. The first receiving housing 1 is disposed above the second receiving housing 2, and the third receiving housing 3 is disposed adjacent to the second receiving housing 2 on at least one side of the second receiving housing 2. The first spacer unit 20 is detachably connected to the second spacer unit 21. This makes the gas-insulated switchgear assembled from the two spacer units more compact, saves space, and facilitates installation and layout in limited spaces. At the same time, the two spacer units are detachable, which is beneficial for individual maintenance and can be transported and installed in limited spaces such as wind turbine towers, improving the flexibility and adaptability of the gas-insulated switchgear.

[0050] The gas-insulated switchgear of this invention, due to its compact structure, modularity, and interchangeability, can be widely used in multiple industries and fields, and is especially suitable for offshore wind power scenarios.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A gas-insulated switchgear, characterized in that, include: The first partition unit includes a first receiving housing, a second receiving housing, and a third receiving housing; The second partition unit includes a first receiving housing, a second receiving housing, and a third receiving housing; Wherein, the first receiving shell, the second receiving shell, and the third receiving shell of the first spacer unit have at least partially the same structure as the first receiving shell, the second receiving shell, and the third receiving shell of the second spacer unit; The first housing includes a circuit breaker control mechanism, the second housing is filled with insulating gas and includes a circuit breaker and an isolating grounding switch, wherein the circuit breaker and the isolating grounding switch in the first bay unit are connected in series between the cable terminal and the first intermediate node, the circuit breaker in the second bay unit is connected in series with the isolating grounding switch via the second intermediate node between the two cable terminals, and the third housing includes a cable terminal for connecting the cable. The first receiving housing is disposed above the second receiving housing, and the third receiving housing is disposed adjacent to the second receiving housing on at least one side of the second receiving housing. The first spacer unit is detachably connected to the second spacer unit by connecting the first intermediate node and the second intermediate node.

2. The gas-insulated switchgear according to claim 1, characterized in that, The first receiving shell, the second receiving shell, and the third receiving shell of the first spacer unit have the same structure as the first receiving shell, the second receiving shell, and the third receiving shell of the second spacer unit.

3. The gas-insulated switchgear according to claim 1, characterized in that, The number of the third housing is at least one, and they correspond one-to-one with the number of cable outlet directions.

4. The gas-insulated switchgear according to claim 1, characterized in that, The first spacer unit further includes a fourth housing, which includes a control device for the gas-insulated switchgear. The fourth housing is disposed on one side of the second housing of the first spacer unit and has at least partially the same structure as the third housing at a corresponding position in the second spacer unit.

5. The gas-insulated switchgear according to claim 1, characterized in that, The third housing is provided with a wiring port. The first spacer unit and the second spacer unit are connected by a cable. The wiring port of the third housing of the first spacer unit is connected to the wiring port of the third housing of the second spacer unit through the cable.

6. The gas-insulated switchgear according to claim 1, characterized in that, The first intermediate node and the second intermediate node are configured as the cable terminals, the first spacer unit and the second spacer unit are connected by a cable, the first spacer unit has two third housings, and the second spacer unit has three third housings.

7. The gas-insulated switchgear according to claim 6, characterized in that, The two third receiving shells of the first spacer unit are arranged adjacent to each other on the same side of the second receiving shell, the two third receiving shells of the second spacer unit are arranged adjacent to each other on the same side of the second receiving shell, and the other third receiving shell of the second spacer unit is arranged on the other side of the second receiving shell.

8. The gas-insulated switchgear according to claim 1, characterized in that, One of the second housing of the first spacer unit and the second housing of the second spacer unit is further provided with a connecting flange, and the other is further provided with a connecting conductor. The connecting flange serves as one of the first intermediate node and the second intermediate node, and the connecting conductor serves as the other of the first intermediate node and the second intermediate node.

9. The gas-insulated switchgear according to claim 8, characterized in that, The first spacer unit has one third housing, and the second spacer unit has two third housings. The third housing of the first spacer unit is disposed in a first part of the space on one side of the second housing of the first spacer unit, and the third housing of the second spacer unit is disposed in a second part of the space on one side of the second housing of the second spacer unit, so that when the first spacer unit and the second spacer unit are connected, the first part of the space and the second part of the space can be combined and disposed on one side of the second housing.

10. The gas-insulated switchgear according to claim 1, characterized in that, The second housing is filled with clean air.

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