Switching device

Abstract

The application relates to the technical field of gas-insulated switchgear, in particular to a switchgear. The switchgear comprises three groups of first connecting pieces, the three groups of first connecting pieces are respectively used for connecting cables and pole columns of corresponding three phases, the three phases comprise phases A, B and C, the three groups of first connecting pieces are arranged in a triangular shape, the distances from the two first connecting pieces used for connecting the cables of the phase A and the cables of the phase C to the corresponding pole columns are both first distances, the distance from the first connecting piece used for connecting the cable of the phase B to the corresponding pole column is a second distance, the first distance is smaller than the second distance. The switchgear is compact, small and simple in overall structure, thereby saving materials and reducing costs, is favorable for reducing impedance loss, and utilizes the space redundancy near the circuit breaker, simultaneously shortens the corresponding cable path connected therewith, and reduces the installation difficulty.

Description

Technical Field

[0001] This application relates to the field of gas-insulated switchgear technology, and in particular to switchgear. Background Technology

[0002] As users increasingly demand smaller, more modular, and more reliable switchgear, more and more switchgear products are entering the market.

[0003] Switchgear houses high-voltage electrical components such as circuit breakers and three-position switches within a sealed enclosure filled with a gaseous insulating medium at a pressure slightly higher than atmospheric pressure. This allows the switchgear to maintain reliable electrical performance even under harsh conditions. Furthermore, switchgear offers advantages such as small size and minimal footprint.

[0004] In related technologies, the inner cones of the ABC three-phase cables in switchgear are arranged horizontally in a straight line. However, this layout occupies a large amount of horizontal space and has low space utilization. Utility Model Content

[0005] Therefore, it is necessary to provide a switchgear to address the problems of large horizontal space occupation and low space utilization.

[0006] A switching device, comprising:

[0007] The three sets of first connectors are used to connect the corresponding three-phase cables and poles. The three phases include phase A, phase B, and phase C. The three sets of first connectors are arranged in a triangular pattern. The distance from the two first connectors used to connect the cables of phase A and phase C to the corresponding poles is the first distance. The distance from the first connector used to connect the cable of phase B to the corresponding pole is the second distance. The first distance is less than the second distance.

[0008] This switchgear utilizes a triangular arrangement of three sets of first connectors, avoiding the waste of lateral space caused by parallel three-phase configurations. This efficient use of space allows for increased phase spacing within the same area, or reduced space usage while maintaining the same phase spacing. This facilitates miniaturization, resulting in a compact, small-scale, and simplified overall structure, thereby saving materials and reducing costs. Furthermore, this layout improves assembly efficiency. Moreover, the triangular arrangement of the three sets of first connectors ensures a more uniform electric field distribution within the switchgear enclosure, enhancing its long-term operational reliability.

[0009] This layout arranges the two first connectors for connecting phase A and phase C cables side-by-side, close to their respective poles. This shortens the connection distance between the inner cone and the circuit breaker, reducing impedance loss and utilizing the space redundancy near the circuit breaker. It also shortens the corresponding cable path, reducing installation difficulty. The first connector for connecting phase B is positioned further back, forming a triangular shape with phases A and C. This avoids three-phase congestion and optimizes the electric field distribution. Although the connection path is slightly longer, the structure is locally orderly, and the appropriate inner cone position helps ensure that the three-phase cables do not interfere with each other or become entangled.

[0010] In one embodiment, the first connector is an inner cone, with the cable inserted into one end of the inner cone and the other end of the inner cone connected to the pole.

[0011] In this embodiment, the layout is positioned based on the location of the inner cone, which acts as an insulating bridge for the high-voltage connection between the cable and the pole. This facilitates the physical and electrical connection between the cable and the internal circuitry of the switchgear, while maintaining insulation performance in an SF6 gas environment. The inner cone is a composite insulating component, typically a conical structure with embedded conductive contacts. It utilizes the uniform electric field distribution on the conical surface to prevent tip discharge; specifically, since electric field strength is inversely proportional to the radius of curvature, a smaller conical curvature results in a lower field strength. The conductive contacts connect to the cable conductor and the pole, ensuring current conduction. Here, the conductive contacts and the pole can be directly or indirectly connected.

[0012] In one embodiment, it further includes:

[0013] Three sets of second connectors, each set of second connectors being configured to connect a corresponding first connector and pole post.

[0014] The second connector improves the flexibility of the structural layout, allowing the layout position between the first connector and the pole post to be unconstrained by the position of the pole post.

[0015] In one embodiment, the second connector is a copper busbar. The copper busbar has high conductivity and low contact resistance, which helps improve the electrical performance of the switchgear.

[0016] In one embodiment, the pole is located above the first connector, and the second connector includes:

[0017] The horizontal connecting part is connected to the first connecting member; and

[0018] The vertical connecting part is connected at one end to one end of the horizontal connecting part and extends in the vertical direction. The side of the vertical connecting part facing the pole post is connected to the pole post.

[0019] The second connection part has a simple structure, is easy to assemble, and facilitates the connection between the side of the vertical connection part and the pole post, which helps to increase the contact area and improve the stability of the electrical connection.

[0020] In one embodiment, it further includes:

[0021] Three sets of clamping components, each connected to a corresponding cable; and

[0022] The bracket is configured to hold three sets of clamps in place.

[0023] The cable is inserted into the inner cone and fixed by the clamping device. The bracket further fixes the clamping device, which helps to improve the connection stability between the cable and the inner cone.

[0024] In one embodiment, it further includes:

[0025] Three sets of current transformers are mounted on the cables and located below the first connector. Each current transformer corresponds to a cable and is configured to monitor the current status of the corresponding cable.

[0026] Instrument transformers are helpful in providing a basis for protection systems and in improving the safety performance of switchgear.

[0027] In one embodiment, the transformer is a through-hole transformer.

[0028] The through-core current transformer has a primary conductor (such as a cable) that passes directly through the toroidal core, without a primary winding; the secondary winding is wound on the core, resulting in a simple structure, small size, and no disruption to the integrity of the primary circuit.

[0029] In one embodiment, it further includes:

[0030] The support assembly is configured to fix three sets of current transformers, so that the fixing position needs to be adapted to the triangular spacing of the cables to avoid interference between the current transformers or with the enclosure wall.

[0031] In one embodiment, the support component includes:

[0032] Three sets of mounting plates, with current transformers mounted on them; the three sets of mounting plates correspond one-to-one with the three current transformers.

[0033] The crossbeam has three sets of mounting plates, all of which are installed on it.

[0034] The structure consists of three sets of mounting plates, each corresponding to a current transformer. A single crossbeam supports and secures the three sets of mounting plates, which helps ensure three-phase consistency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a switching device provided in one embodiment of this application.

[0036] Figure 2 This is a schematic diagram of the internal cone layout structure of a switching device provided in one embodiment of this application.

[0037] Figure 3 This is a schematic diagram of the cable layout structure of a switching device provided in one embodiment of this application.

[0038] Figure 4 This is a schematic diagram of the circuit breaker layout structure of a switching device provided in one embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100 - First connecting piece; 110 - Phase A inner cone; 120 - Phase B inner cone; 130 - Phase C inner cone;

[0041] 200-Cable; 210-A-phase cable; 220-B-phase cable; 230-C-phase cable;

[0042] 300 - Circuit breaker; 310 - Pole; 311 - Phase A pole; 312 - Phase B pole; 313 - Phase C pole;

[0043] 400 - Second connector; 410 - Horizontal connector; 420 - Vertical connector;

[0044] 500-Mutual transformer; 510-A mutual transformer; 520-B mutual transformer; 530-C mutual transformer;

[0045] 600 - Support assembly; 610 - Mounting plate; 620 - Crossbeam;

[0046] 700- Enclosure. Detailed Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0048] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three sets, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "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 or an electrical 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0053] like Figures 1 to 3 As shown, this embodiment provides a switching device. Figure 1 A schematic diagram of the switching device provided in this embodiment is shown. Figure 2 A schematic diagram of the layout structure of the inner cone of the switching device provided in this embodiment is shown. Figure 3 A schematic diagram of the cable 200 layout structure of the switching device provided in this embodiment is shown.

[0054] like Figures 1 to 3 As shown, the switchgear includes a housing 700, a circuit breaker 300, and a three-position switch. The circuit breaker 300 and the three-position switch are located within the housing 700. The circuit breaker 300 also includes poles 310, which, corresponding to the three-position switch, are arranged in three sets, each corresponding to one of the three stationary contacts of the three-position switch.

[0055] Furthermore, the enclosure 700 is a sealed container filled with SF6 gas as an insulating medium, providing a closed space for the internal structure, which helps to ensure pressure resistance and sealing performance.

[0056] The pipe opening equipment also includes three sets of first connectors 100, which are used to connect the corresponding three-phase cables 200 and poles 310 respectively. The three phases include phase A, phase B and phase C, and the three sets of first connectors 100 are arranged in a triangular shape.

[0057] This switchgear utilizes a triangular arrangement of three sets of first connectors 100, avoiding the waste of lateral space caused by parallel three-phase configurations. This efficient use of space allows for increased phase spacing within the same area, or reduced space usage while maintaining the same phase spacing. This facilitates miniaturization, resulting in a compact, compact, and simplified overall structure, thereby saving materials and reducing costs. Furthermore, this layout improves assembly efficiency. Moreover, the triangular arrangement of the three sets of first connectors 100 ensures a more uniform electric field distribution within the switchgear enclosure 700, enhancing the long-term reliability of the switchgear.

[0058] Specifically, the three-phase cables 200 are A-phase cable 210, B-phase cable 220, and C-phase cable 230. A-phase cable 210, B-phase cable 220, and C-phase cable 230 constitute the three live wires of the three-phase AC circuit, each carrying an alternating current with a phase difference of 120°, and together realizing the transmission and distribution of high-voltage electrical energy.

[0059] Optionally, the first connector 100 is an inner cone, with one end of the cable 200 inserted into the inner cone, and the other end connected to the pole post 310. In this embodiment, the layout is positioned based on the location of the inner cone, which acts as an insulating bridge for the high-voltage connection between the cable 200 and the pole post 310. This facilitates the physical and electrical connection between the cable 200 and the internal circuitry of the switchgear, while maintaining insulation performance in an SF6 gas environment. The inner cone is a composite insulating component, typically a conical structure with embedded conductive contacts. It utilizes the uniform electric field distribution on the conical surface to prevent tip discharge. Specifically, since electric field strength is inversely proportional to the radius of curvature, a smaller conical curvature results in a lower electric field strength. The conductive contacts are connected to the conductor of the cable 200 and the pole post 310 to ensure current conduction. Here, the conductive contacts and the pole post 310 can be directly or indirectly connected.

[0060] Specifically, the first connector 100 connected to the A-phase cable 210 is an A-phase inner cone 110, the first connector 100 connected to the B-phase cable 220 is a B-phase inner cone 120, and the first connector 100 connected to the C-phase cable 230 is a C-phase inner cone 130.

[0061] Meanwhile, the A-phase pole 311 is connected to the inner cone 110 of phase A, the B-phase pole 312 is connected to the inner cone 120 of phase B, and the C-phase pole 313 is connected to the inner cone 130 of phase C.

[0062] Furthermore, the distances from the two first connectors 100 of the cable 200 for connecting phase A and phase C to the corresponding pole 310 are both first distances, and the distance from the first connector 100 of the cable 200 for connecting phase B to the corresponding pole 310 is a second distance, with the first distance being less than the second distance.

[0063] That is, the inner cone 110 of phase A and the inner cone 130 of phase C are arranged side by side, and the distance between the inner cone 110 of phase A and the corresponding pole 311 of phase A is the first distance, the distance between the inner cone 130 of phase C and the corresponding pole 313 of phase C is the first distance, and the distance between the inner cone 120 of phase B connected to phase B cable 220 and the pole 312 of phase B is the second distance. The first distance is less than the second distance.

[0064] This layout, with the inner cones 110 and 130 of phase A and phase C arranged side-by-side and close to the corresponding poles 310, shortens the connection distance between the inner cones 110 and 130 of phase A and phase C and the circuit breaker 300, reducing impedance loss and utilizing the space redundancy near the circuit breaker 300. It also shortens the path of the corresponding cable 200, reducing installation difficulty. The inner cone 120 of phase B is positioned further back, forming a triangular shape with phases A and C, avoiding three-phase congestion and optimizing the electric field distribution. The phase B cable 220 connects to the inner cone 120 of phase B, placing it further back. Although the connection path is slightly longer, the structure is locally orderly, and the corresponding inner cone positions help ensure that the three-phase cables 200 do not interfere with each other or become entangled.

[0065] Furthermore, the switchgear also includes three sets of second connectors 400. Each set of second connectors 400 is used to connect the corresponding first connector 100 and pole post 310. That is, there are three sets of second connectors 400, which respectively connect the inner cones of phase A, phase B, and phase C to the pole post 310. The second connectors 400 help to improve the flexibility of the structural layout, so that the layout position between the first connector 100 and the pole post 310 is not constrained by the position of the pole post 310.

[0066] Preferably, the second connector 400 is a copper busbar, which has high conductivity and low contact resistance, thus improving the electrical performance of the switchgear.

[0067] like Figure 1 and Figure 2 As shown, in some embodiments, the pole post 310 is located above the first connector 100, and the second connector 400 includes a horizontal connecting portion 410 and a vertical connecting portion 420. The horizontal connecting portion 410 is connected to the first connector 100, and one end of the vertical connecting portion 420 is connected to one end of the horizontal connecting portion 410 and extends vertically. The side of the vertical connecting portion 420 facing the pole post 310 is connected to the pole post 310. This second connecting portion has a simple structure, is easy to assemble, and facilitates the connection between the side of the vertical connecting portion 420 and the pole post 310, which helps to increase the contact area and improve the stability of the electrical connection. At the same time, the horizontal distance between the horizontal connecting portion 410 and the inner cone and the pole post 310 corresponds to the horizontal distance between the inner cone and the pole post 310. In this triangular layout of the switchgear, the horizontal connecting portion 410 connected to the inner cone 120 of phase B is relatively long. This structure of the second connector 400 helps to ensure a neat connection structure and avoid confusion.

[0068] In addition, the switchgear includes three sets of clamps and a bracket. Each clamp is connected to a cable 200 in a one-to-one correspondence, and the bracket secures the three sets of clamps. The cable 200 is inserted into the inner cone and secured by the clamps; the bracket further secures the clamps, which helps improve the connection stability between the cable 200 and the inner cone.

[0069] like Figures 1 to 4 As shown, the switchgear also includes three sets of current transformers 500. Each current transformer 500 is sleeved on the cable 200 and located below the first connector 100, specifically below its corresponding inner cone. Each current transformer 500 corresponds to one cable 200 and is used to monitor the current state of the corresponding cable 200. The current transformers 500 provide a basis for the protection system and improve the safety performance of the switchgear.

[0070] More specifically, the A-phase cable 210 is connected to the A-phase mutual inductor 510, the B-phase cable 220 is connected to the B-phase mutual inductor 520, and the C-phase cable 230 is connected to the C-phase mutual inductor 530.

[0071] Optionally, the current transformer 500 is a through-core current transformer 500, which is concentrically arranged with the cable 200. The through-core structure allows the current transformer 500 to be directly sleeved on the outside of the cable 200 and arranged synchronously with the triangular path of the cable 200 without the need for additional space adjustment, and it is safer. The through-core current transformer 500 has the primary conductor (such as the cable 200) directly passing through the toroidal iron core, without a primary winding; the secondary winding is wound on the iron core, which is simple in structure, small in size, and does not destroy the integrity of the primary circuit.

[0072] In some embodiments, the switch assembly further includes a support assembly 600 for fixing three sets of current transformers 500, such that the fixing position is adapted to the triangular spacing of the cables 200, so as to avoid interference between the current transformers 500 or with the wall of the housing 700.

[0073] The support assembly 600 includes a crossbeam 620 and three sets of mounting plates 610. Current transformers 500 are mounted on the mounting plates 610, with each of the three sets of mounting plates 610 corresponding to one of the three sets of current transformers 500; all three sets of mounting plates 610 are mounted on the crossbeam 620. In this structure, each of the three sets of mounting plates 610 fixes a current transformer 500. A single crossbeam 620 collectively supports and fixes the three sets of mounting plates 610, which helps ensure three-phase consistency.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A switching device, characterized by include: Three sets of first connectors (100) are used to connect the corresponding three-phase cables (200) and poles (310), respectively. The three phases include phase A, phase B and phase C. The three sets of first connectors (100) are arranged in a triangular shape. The distance from the two first connectors (100) used to connect the cable (200) of phase A and the cable (200) of phase C to the corresponding pole (310) is a first distance. The distance from the first connector (100) used to connect the cable (200) of phase B to the corresponding pole (310) is a second distance. The first distance is less than the second distance.

2. The switching device of claim 1, wherein The first connector (100) is an inner cone head, the cable (200) is inserted into one end of the inner cone head, and the other end of the inner cone head is connected to the pole (310).

3. The switching device of claim 1, wherein Also includes: Three sets of second connectors (400), each set of second connectors (400) being configured to connect the corresponding first connector (100) and the pole post (310).

4. The switching device of claim 3, wherein The second connector (400) is a copper busbar.

5. The switching device of claim 3, wherein The pole post (310) is located above the first connector (100), and the second connector (400) includes: The horizontal connecting part (410) is connected to the first connecting member (100); and The vertical connecting part (420) is connected at one end to one end of the horizontal connecting part (410) and extends in the vertical direction. The side of the vertical connecting part (420) facing the pole post (310) is connected to the pole post (310).

6. The switching device according to any of claims 1-5, characterized in that Also includes: Three sets of clamping members, each clamping member being connected to the cable (200) in a one-to-one correspondence; as well as The bracket is configured to fix the three sets of clamps.

7. The switching device according to any of claims 1-5, characterized in that Also includes: Three sets of current transformers (500) are sleeved on the cable (200) and located below the first connector (100). The current transformers (500) are arranged one-to-one with the cables (200) and are configured to monitor the current state of the corresponding cables (200).

8. The switching device of claim 7, wherein The current transformer (500) is a through-core current transformer (500).

9. The switching device of claim 7, wherein Also includes: The support assembly (600) is configured to fix the three sets of the current transformers (500).

10. The switching device of claim 9, wherein The support component (600) includes: Three sets of mounting plates (610), with the current transformers (500) mounted on the mounting plates (610), and the three sets of mounting plates (610) corresponding one-to-one with the three sets of current transformers (500); and The crossbeam (620) and the three sets of mounting plates (610) are all mounted on the crossbeam (620).

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