Gas-insulated switchgear

Abstract

The utility model discloses a kind of gas insulation switch cabinet, it is related to switch cabinet technical field, wherein, gas insulation switch cabinet includes cabinet, gas tank, three-station switch, vacuum circuit breaker, current transformer group and electrical interface assembly, the electrical interface assembly includes first electrical interface and second electrical interface, the first electrical interface and the second electrical interface are located at the top of the gas tank, and the second electrical interface is close to the rear of the gas tank Settings.The utility model's technical scheme is by being arranged at the top of gas tank and being detachably connected lightning arrester or tube bus adapter, realize the flexible switching of cable incoming line and tube bus incoming line function, make the same cabinet type can be used as conventional incoming line switch cabinet or main transformer incoming line switch cabinet, improve the adaptability of component, solve the problem of poor versatility of traditional switch cabinet, increase cabinet top heat dissipation space, improve natural heat dissipation, improve installation and maintenance convenience.

Description

Technical Field

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

[0002] With the increasing demands for power supply reliability, operational safety, and space utilization efficiency in power systems, medium-voltage switchgear, as a key component of power grid operation, faces higher requirements in its structural design and functional integration. Gas-insulated switchgear, due to its sealing of high-voltage live components within a gas-filled gas chamber, possesses excellent insulation performance, a compact structural layout, and maintenance-free characteristics, and has been widely used in various substations and distribution systems. However, in practical engineering applications, existing switchgear still faces problems such as inconvenient installation, poor heat dissipation, poor component compatibility, and insufficient cabinet versatility, resulting in long design cycles, low production efficiency, and difficult on-site construction, making it difficult to meet the growing demands for standardization, modularization, and rapid delivery. Utility Model Content

[0003] The main purpose of this utility model is to propose a gas-insulated switchgear, which aims to solve the problems of inconvenient installation and maintenance, poor heat dissipation performance, low component compatibility, and weak cabinet versatility in practical applications of gas-insulated switchgear.

[0004] To achieve the above objectives, this utility model proposes a gas-insulated switchgear, which includes:

[0005] The cabinet has an internal mounting cavity.

[0006] The gas box is located inside the installation cavity. The gas box has a sealed cavity filled with an insulating gas medium.

[0007] A three-position switch, which includes a main circuit, is located inside a sealed cavity;

[0008] A vacuum circuit breaker includes poles, which are housed within a sealed cavity. The outgoing terminals of the main circuit are electrically connected to the incoming terminals of the poles.

[0009] A current transformer group includes a current transformer, which is located inside a sealed cavity and connected to the bottom wall of the sealed cavity. The current transformer is provided with a power supply side terminal and a load side terminal, and the power supply side terminal is electrically connected to the output terminal of the pole.

[0010] An electrical interface assembly includes a first electrical interface and a second electrical interface, both located on the top of the gas box, with the second electrical interface positioned closer to the rear of the gas box. The main circuit's input terminal is electrically connected to the first electrical interface, which is used to introduce external power. The second electrical interface includes a first cable socket and a second cable socket, with the gas box capable of detachably connecting to either the first or second cable socket. The first or second cable socket is electrically connected to the load-side terminal, with the first cable socket used for connection to a surge arrester and the second cable socket used for connection to a busbar adapter.

[0011] In one embodiment, there are multiple current transformers, and the number of first cable sockets is the same as the number of current transformers and they are arranged in a one-to-one correspondence. The number of second cable sockets is the same as the number of current transformers and they are arranged in a one-to-one correspondence.

[0012] In one embodiment, the cabinet also includes a cable compartment, and the cable compartment and the mounting cavity are arranged sequentially along a first direction. The electrical interface assembly further includes a third electrical interface, which includes a third cable female connector. The third cable female connector is connected to the bottom wall of the sealed cavity and is electrically connected to the load-side terminal. A cable plug is provided on the top of the cable compartment and is connected to the third cable female connector. The cable plug is used to connect to the power cable. The number of third cable female connectors is the same as the number of current transformers and they are arranged in a one-to-one correspondence. The number of cable plugs is the same as the number of current transformers and they are arranged in a one-to-one correspondence.

[0013] In one embodiment, the multiple current transformers are a first current transformer, a second current transformer, and a third current transformer. The first current transformer and the second current transformer are arranged at intervals along a second direction, and the third current transformer is located on the side of the first current transformer facing the rear of the gas box. The first direction is perpendicular to the second direction.

[0014] In one embodiment, the plurality of third cable connectors are a first outgoing connector, a second outgoing connector, and a third outgoing connector. The first outgoing connector and the second outgoing connector are respectively located on opposite sides of the third current transformer along the second direction, and the third outgoing connector is located on the side of the third current transformer facing the rear of the gas box.

[0015] In one embodiment, a power cable opening is provided at the bottom of the cabinet for the power cable to pass through.

[0016] In one embodiment, the multiple current transformers are a first current transformer, a second current transformer, and a third current transformer. The first current transformer, the second current transformer, and the third current transformer are arranged at intervals along a second direction, and the first direction is perpendicular to the second direction.

[0017] In one embodiment, a plurality of second cable female connectors are arranged at intervals along a second direction, and the first direction is perpendicular to the second direction.

[0018] In one embodiment, the interior of the cabinet is divided into an operating room, an installation space, and a pressure relief chamber along a third direction. The installation space is divided into an installation cavity and a cable chamber along a first direction. The third direction and the first direction are perpendicular to each other. The three-position switch also includes an operating mechanism connected to the main circuit, which is located in the operating room. The vacuum circuit breaker also includes an operating device connected to the pole, which is located in the operating room. The gas-insulated switchgear also includes a pressure relief burst valve located in the pressure relief chamber. The gas box is provided with a pressure relief port communicating with the pressure relief chamber. The pressure relief burst valve is connected to the gas box to block or open the pressure relief port.

[0019] In one embodiment, the cabinet includes a shell, a first partition, a second partition, a third partition, and a fixing device. The shell has an interior cavity. The first and second partitions are both connected to the cavity wall, so that the cavity is divided into an operating room, an installation space, and a pressure relief chamber in a third direction. The first and second partitions are both connected to the third partition, so that the installation space is divided into an installation cavity and a cable cavity in a first direction. The air box is detachably connected to the cavity wall of the installation cavity through the fixing device.

[0020] And / or,

[0021] The bottom of the pressure relief chamber is equipped with a pressure relief vent that communicates with the external environment;

[0022] And / or,

[0023] The bottom of the housing is provided with control cable openings, and the number of control cable openings is at least two. The at least two control cable openings include a first control cable opening and a second control cable opening. The first control cable opening is used for the first control cable to pass through, and the second control cable opening is used for the second control cable to pass through. The operating mechanism is used to be electrically connected to the first control cable, and the operating device is used to be electrically connected to the second control cable.

[0024] In this embodiment of the invention, the sealed cavity of the gas box is filled with an insulating gas medium, providing an excellent insulating environment for the internal high-voltage live components, effectively preventing corona discharge and phase-to-phase short circuits, and improving the safety and reliability of equipment operation. A pressure relief burst valve is installed in the pressure relief chamber and cooperates with the pressure relief port of the gas box; when an arc fault occurs inside the switchgear causing a sudden pressure rise, the pressure relief burst valve ruptures rapidly, guiding the high-pressure gas to the pressure relief chamber and discharging it outside the cabinet through the bottom pressure relief hole, preventing the cabinet from exploding and ensuring the safety of personnel and equipment. The main circuit of the three-position switch is located in the sealed cavity of the gas box. Its inlet terminal is electrically connected to the first electrical interface at the top, achieving docking with the upstream busbar; its outlet terminal is connected to the inlet terminal of the vacuum circuit breaker, forming a top-down current conduction path. That is, the main circuit is located in the upper area of ​​the sealed cavity and connected to the first electrical interface, and in the lower area docked with the vacuum circuit breaker, resulting in a compact structure and a clear path. The poles of the vacuum circuit breaker are located inside the sealed cavity and are responsible for the switching function of the main circuit. Its operating device is located in the operating room. The arc-extinguishing chamber is driven by the insulating pull rod to perform the opening and closing operation. This achieves highly reliable operation while placing vulnerable parts in a maintainable area, thus extending the equipment life.

[0025] The current transformer assembly is housed within a sealed cavity and connected to the bottom wall of the cavity. Its power supply side terminals are electrically connected to the output terminals of the vacuum circuit breaker poles, while its load side terminals are connected to the electrical interface assembly, forming a measurement and protection sampling circuit. The main circuit's flow path is: external power supply, first electrical interface, three-position switch, vacuum circuit breaker, current transformer, first cable socket or second cable socket, forming a standardized electrical path layout.

[0026] The electrical interface assembly includes a first electrical interface and a second electrical interface, both located on the top of the gas chamber. The second electrical interface is positioned closer to the pressure relief chamber, i.e., closer to the rear of the cabinet. The first cable socket is used to connect the surge arrester, and the second cable socket is used to connect the busbar adapter. Both can be selectively installed at the second electrical interface location to achieve functional switching. As the main circuit current-carrying interface, the second cable socket has a higher current-carrying capacity due to its conductive structure, meeting the high-current operation requirements of the busbar inlet, thus reflecting the functional difference between it and the surge arrester interface (first cable socket).

[0027] The above design seals high-voltage components and externalizes low-voltage operations, achieving an integrated layout that is "highly insulated and easy to maintain." The resulting benefits are: by providing a replaceable second electrical interface on the top of the gas-insulated switchgear, surge arresters or busbar adapters can share the same installation location, enabling functional conversion between different incoming line methods without altering the cabinet structure. This allows the same gas-insulated switchgear to function as both a conventional incoming / outgoing line switchgear and a main transformer incoming line switchgear, significantly improving versatility and design reusability. It also solves the problem of requiring separate cabinet designs in traditional solutions, facilitating standardized production and rapid delivery. Furthermore, the main circuit must sequentially pass through the vacuum circuit breaker and current transformer before connecting to the outgoing interface, forming a standardized current path, improving wiring consistency and ease of maintenance. Advantages: By placing the surge arrester interface on the rear top of the gas-insulated switchgear, utilizing the lower height space at the rear of the cabinet for installation, compared to the traditional design where the surge arrester is placed at the bottom of the cabinet or in the cable room, resulting in an increased overall cabinet height, this design effectively reduces the overall cabinet height, minimizes the space occupied at the top of the gas-insulated switchgear and the top of the prefabricated compartment, increases the air convection channel at the top, improves natural heat dissipation, and avoids transportation exceeding limits, achieving a compact structural design. At the same time, arranging the surge arrester interface on the rear top also facilitates maintenance and installation by operators at the rear of the cabinet, improving maintenance convenience and solving the problems of limited space and inconvenient operation in the traditional bottom installation method.

[0028] This utility model embodiment achieves flexible switching between cable entry and busbar entry functions by placing the second electrical interface on the top of the gas box and detachably connecting it to a surge arrester or a busbar adapter. This allows the same cabinet type to be used as a conventional incoming / outgoing line switchgear or a main transformer incoming line switchgear, improving the compatibility of components and solving the problem of poor versatility of traditional switchgear. By arranging the surge arrester interface on the rear side of the top of the gas box and making the rear height of the cabinet lower than the front panel, the heat dissipation space on the top of the cabinet is increased, improving natural heat dissipation and avoiding the impact of excessive cabinet height on transportation. At the same time, it improves the convenience of installation and maintenance. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the first embodiment of the gas-insulated switchgear of this utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the first embodiment of the gas-insulated switchgear of this utility model from another perspective;

[0032] Figure 3 This is a schematic diagram of the structure of the second embodiment of the gas-insulated switchgear of this utility model;

[0033] Figure 4 This is a schematic diagram of the second embodiment of the gas-insulated switchgear of this utility model from another perspective.

[0034] Explanation of icon numbers:

[0035] 100. Gas-insulated switchgear; 1. Cabinet; 11. Housing; 111. Cavity; 1111. Operating room; 1112. Installation space; 11121. Installation cavity; 11122. Cable compartment; 1113. Pressure relief chamber; 11131. Pressure relief hole; 112. Power cable opening; 113. First control cable opening; 114. Second control cable opening; 12. First partition; 13. Second partition; 14. Third partition; 15. Fixing device; 2. Gas box; 21. Sealed cavity; 22. Pressure relief port; 3. Pressure relief burst valve; 4. Three-position switch; 41. Operating mechanism; 42. 5. Main circuit; 5. Vacuum circuit breaker; 51. Operating device; 52. Pole; 6. Current transformer group; 61. First current transformer; 611. Power supply side terminal; 612. Load side terminal; 62. Second current transformer; 63. Third current transformer; 7. Electrical interface assembly; 71. First electrical interface; 72. Second electrical interface; 721. First cable socket; 722. Second cable socket; 73. Third electrical interface; 731. Third cable socket; 7311. First outgoing cable socket; 7312. Second outgoing cable socket; 7313. Third outgoing cable socket; 8. Cable plug / plug;

[0036] 200. Surge arrester; 300. Busbar adapter; 400. Power cable; 500. Busbar.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, and back), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] With the increasing demands for power supply reliability, operational safety, and space utilization efficiency in power systems, medium-voltage switchgear, as a key component of power grid operation, faces higher requirements in its structural design and functional integration. Gas-insulated switchgear, due to its sealing of high-voltage live components within a gas-filled gas chamber, possesses excellent insulation performance, a compact structural layout, and maintenance-free characteristics, and has been widely used in various substations and distribution systems. However, in practical engineering applications, existing switchgear still faces problems such as inconvenient installation, poor heat dissipation, poor component compatibility, and insufficient cabinet versatility, resulting in long design cycles, low production efficiency, and difficult on-site construction, making it difficult to meet the growing demands for standardization, modularization, and rapid delivery.

[0042] After careful investigation, the applicant discovered that the aforementioned problems stem from the inherent limitations of the internal component layout in traditional switchgear. Surge arresters are typically located at the bottom of the cabinet or in the cable compartment. Due to the compact space and poor ventilation of the cable compartment, installation and maintenance are difficult, and long-term heat accumulation can negatively impact their electrical performance and lifespan. The overall cabinet height is too high, resulting in insufficient distance between its top and the prefabricated compartment roof, limiting airflow and severely affecting natural heat dissipation. Further increasing the cabinet height to improve heat dissipation may exceed the height restrictions of transport vehicles, creating logistical and installation challenges. Cable plugs are mostly located approximately 600mm from the ground. This area is cramped, with crowded three-phase cable arrangements, making operation inconvenient for construction personnel, and particularly unfavorable for the installation and wiring of zero-sequence current transformers. Current transformers are generally arranged horizontally in a straight line, occupying a large amount of horizontal space within the cabinet. When projects require the use of CTs with small transformation ratios and large volumes, installation is often impossible due to insufficient standard cabinet width (600mm), limiting the product's applicability. In addition, cable inlets and busbar inlets require cabinets with different structural forms. The two differ in top interface, internal connection path and support structure, which means that each type of project needs to be designed separately. The lack of a unified standardized platform seriously restricts mass production and rapid response capabilities.

[0043] The main purpose of this utility model is to propose a gas-insulated switchgear to solve the problems of inconvenient installation and maintenance, poor heat dissipation performance, low component compatibility, and weak cabinet versatility in practical applications of gas-insulated switchgear.

[0044] Please see Figure 1 and Figure 3In one embodiment of this utility model, the gas-insulated switchgear 100 includes a cabinet 1, a gas box 2, a pressure relief and explosion valve 3, a three-position switch 4, a vacuum circuit breaker 5, a current transformer group 6, and an electrical interface assembly 7. The interior of the cabinet 1 is divided into an operating chamber 1111, an installation space 1112, and a pressure relief chamber 1113 along a third direction. The installation space 1112 is divided into an installation cavity 11121 and a cable chamber 11122 along a first direction. The third direction and the first direction are perpendicular to each other. The gas box 2 is disposed in the installation cavity 11121 and has a sealed cavity 21. The sealed cavity 21 is filled with an insulating gas medium. The gas box 2 is provided with a pressure relief port 22 communicating with the pressure relief chamber 1113. The pressure relief burst valve 3 is located in the pressure relief chamber 1113 and is connected to the gas box 2 to block or open the pressure relief port 22. The three-position switch 4 includes an operating mechanism 41 and a main circuit 42 connected to each other. The operating mechanism 41 is located in the operating chamber 1111, and the main circuit 42 is located in the sealed cavity 21. The vacuum circuit breaker 5 includes an operating device 51 and a pole 52 connected to each other. The operating device 51 is located in the operating chamber 1111, and the pole 52 is located in the sealed cavity 21. Inside the sealed cavity 21, the output terminal of the main circuit 42 is electrically connected to the input terminal of the pole 52; the current transformer group 6 includes a current transformer located inside the sealed cavity 21 and connected to the bottom wall of the sealed cavity 21. The current transformer is provided with a power supply side terminal 611 and a load side terminal 612, and the power supply side terminal 611 is electrically connected to the output terminal of the pole 52; the electrical interface assembly 7 includes a first electrical interface 71 and a second electrical interface 72. Both the first electrical interface 71 and the second electrical interface 72 are located on the top of the gas box 2, and the second electrical interface 72 is close to... The air box 2 is located at the rear; the inlet of the main circuit 42 is electrically connected to the first electrical interface 71, which is used to introduce external power; the second electrical interface 72 includes a first cable socket 721 and a second cable socket 722. The air box 2 can be detachably connected to the first cable socket 721 or the second cable socket 722. The first cable socket 721 or the second cable socket 722 can be electrically connected to the load-side terminal 612. The first cable socket 721 is used to connect to the surge arrester 200, and the second cable socket 722 is used to connect to the busbar adapter 300.

[0045] In the embodiments of this utility model, such as Figure 1As shown, the first direction is up and down, the second direction is left and right, and the third direction is front and back. The sealed cavity 21 of the gas box 2 is filled with an insulating gas medium, providing an excellent insulating environment for the internal high-voltage live components, effectively preventing corona discharge and phase-to-phase short circuits, and improving the safety and reliability of equipment operation. The pressure relief burst valve 3 is installed in the pressure relief chamber 1113 and cooperates with the pressure relief port 22 of the gas box 2; when an arc fault occurs inside the switchgear, causing a sudden pressure rise, the pressure relief burst valve 3 ruptures rapidly, guiding the high-pressure gas to the pressure relief chamber 1113 and discharging it outside the cabinet through the bottom pressure relief hole 11131, preventing the cabinet 1 from exploding and ensuring the safety of personnel and equipment. The main circuit 42 of the three-position switch 4 is located inside the sealed cavity 21 of the gas box 2. Its inlet terminal is electrically connected to the first electrical interface 71 at the top, realizing the connection with the upstream busbar; the outlet terminal is connected to the inlet terminal of the vacuum circuit breaker 5, forming a current conduction path from top to bottom. That is, the main circuit 42 is located in the upper area of ​​the sealed cavity 21 and connected to the first electrical interface 71, and in the lower area it is connected to the vacuum circuit breaker 5. The structure is compact and the path is clear. The pole 52 of the vacuum circuit breaker 5 is located inside the sealed cavity 21 and undertakes the function of switching the main circuit. Its operating device 51 is located in the operating room 1111, which realizes high reliability operation while placing vulnerable parts in the maintainable area and extending the equipment life.

[0046] The current transformer group 6 is housed within the sealed cavity 21 and connected to the bottom wall of the cavity 21. Its power supply side terminal 611 is electrically connected to the output terminal of the vacuum circuit breaker 5 pole 52, while its load side terminal 612 is connected to the electrical interface assembly 7, forming a measurement and protection sampling circuit. The main circuit flow path is: external power supply, first electrical interface 71, three-position switch 4, vacuum circuit breaker 5, current transformer, first cable socket 721 or second cable socket 722, forming a standardized electrical path layout.

[0047] The electrical interface assembly 7 includes a first electrical interface 71 and a second electrical interface 72, both located on the top of the gas box 2. The second electrical interface 72 is positioned near the pressure relief chamber 1113, i.e., near the rear of the cabinet. The first cable connector 721 is used to connect the surge arrester 200, and the second cable connector 722 is used to connect the busbar adapter 300. Both can be selectively installed at the second electrical interface 72 to achieve functional switching. The second cable connector 722 serves as the main circuit current-carrying interface, and its conductive structure has a higher current-carrying capacity to meet the high-current operation requirements under the busbar inlet conditions, reflecting the functional difference between it and the surge arrester 200 interface (first cable connector 721).

[0048] The above design seals high-voltage components and externalizes low-voltage operations, achieving an integrated layout that is "highly insulated and easy to maintain." The resulting benefits are: by setting a replaceable second electrical interface 72 on the top of the gas-insulated switchgear 2, the compatibility of components is improved, allowing the surge arrester 200 or the busbar adapter 300 to share the same installation location. This enables functional conversion between different incoming line methods without changing the structure of the cabinet 1, allowing the same gas-insulated switchgear 100 to be used as both a conventional incoming / outgoing line switchgear and a main transformer incoming line switchgear, significantly improving versatility and design reusability. This solves the problem of traditional solutions requiring separate cabinet design, facilitating standardized production and rapid delivery. The main circuit 42 must sequentially pass through the vacuum circuit breaker 5 and the current transformer before connecting to the outgoing interface, forming a standardized current path and improving wiring consistency. In terms of safety and ease of maintenance, the surge arrester 200 interface is located on the top rear side of the gas box 2, utilizing the lower height space at the rear of the cabinet 1 for installation. Compared to the traditional design where the surge arrester 200 is located at the bottom of the cabinet 1 or inside the cable compartment 11122, which increases the overall cabinet height, this effectively reduces the overall cabinet height, reduces the space occupied by the top of the gas-insulated switchgear 100 and the top of the prefabricated cabin, increases the top air convection channel, improves natural heat dissipation conditions, and avoids transportation exceeding limits, achieving a compact structural design. At the same time, arranging the surge arrester 200 interface on the top rear side also facilitates operation and maintenance by operators at the rear of the cabinet, improving maintenance convenience and solving the problems of limited space and inconvenient operation in the traditional bottom installation method.

[0049] The technical solution of this utility model achieves flexible switching between cable entry and busbar entry functions by setting the second electrical interface 72 on the top of the gas box 2 and detachably connecting it to the surge arrester 200 or the busbar adapter 300. This allows the same cabinet type to be used as a conventional incoming and outgoing line switch cabinet or a main transformer incoming line switch cabinet, improving the compatibility of components and solving the problem of poor versatility of traditional switch cabinets. By arranging the surge arrester 200 interface on the rear side of the top of the gas box 2 and making the rear height of the cabinet lower than the front panel, the heat dissipation space on the top of the cabinet is increased, improving natural heat dissipation and avoiding the impact of excessive height of the cabinet 1 on transportation. At the same time, it improves the convenience of installation and maintenance.

[0050] In this embodiment, copper busbars can be used to connect the three-position switch 4, vacuum circuit breaker 5, current transformer group 6 and electrical interface assembly 7, thereby ensuring conductivity reliability, current carrying capacity and heat dissipation performance; the insulating gas medium in the sealed cavity 21 is usually sulfur hexafluoride gas.

[0051] Please see Figure 2 and Figure 4In one embodiment, there are multiple current transformers. The number of first cable connectors 721 is the same as the number of current transformers and they are arranged in a one-to-one correspondence. The number of second cable connectors 722 is the same as the number of current transformers and they are arranged in a one-to-one correspondence. Specifically, multiple current transformers are arranged in the sealed cavity 21 of the gas box 2 for measuring and sampling the current of each phase of the main circuit 42. The first cable connectors 721 and the second cable connectors 722 are both arranged at the rear top of the gas box 2 as detachable connection interfaces, which are used to connect the surge arrester 200 or the busbar adapter 300, respectively. The load side terminal 612 of each current transformer is electrically connected to the corresponding first cable connector 721 or second cable connector 722 through a copper busbar to form an independent three-phase or multi-phase outgoing path. By ensuring that the number of first cable connectors 721 and second cable connectors 722 corresponds one-to-one with the number of current transformers, precise matching between electrical interface configuration and system phase number is achieved. This supports flexible configuration of current transformers and corresponding outgoing interfaces based on different phase numbers (such as three-phase systems), ensuring independent circuit connections and clear paths for each phase, and avoiding interface redundancy or insufficiency. Furthermore, when replacing functional modules, there is no need to adjust the number of interfaces or internal wiring layout, enhancing the adaptability of the gas-insulated switchgear 100 to different application requirements. This solves the problems of installation inconvenience and design duplication caused by mismatched interface numbers, facilitating standardized production and rapid on-site assembly.

[0052] Please see Figure 1In one embodiment, the electrical interface assembly 7 further includes a third electrical interface 73, which includes a third cable socket 731. The third cable socket 731 is connected to the bottom wall of the sealed cavity 21 and is electrically connected to the load-side terminal 612. A cable plug 8 is provided on the top of the cable chamber 11122 and is connected to the third cable socket 731. The cable plug 8 is used to connect to the power cable 400. The number of third cable sockets 731 is the same as the number of current transformers and they are arranged in a one-to-one correspondence. The number of cable plugs 8 is the same as the number of current transformers and they are arranged in a one-to-one correspondence. Specifically, after each current transformer collects the current signal of the corresponding phase, its load-side terminal 612 is electrically connected to the corresponding third cable socket 731 through a copper busbar, and then connected to the external three-phase power cable 400 through the cable plug 8 to form a complete outgoing circuit. By matching the number of third cable sockets 731 and cable plugs 8 with the number of current transformers, the independence and symmetry of the three-phase circuit in the outgoing connection are ensured. The current path of each phase is clear and the connection relationship is well-defined. This achieves the standardization and modular configuration of the outgoing interface of the three-phase power cable 400, supports flexible adaptation to different phase number systems, and avoids problems such as incorrect phase sequence connection or interface mismatch. At the same time, this design enables the gas-insulated switchgear 100 to directly connect to the power cable 400, meets the reliability and convenience requirements of conventional incoming and outgoing switchgear for cable connection, improves the versatility of the equipment and the efficiency of on-site installation, and facilitates rapid docking and maintenance.

[0053] Please see Figure 1 and Figure 2In one embodiment, the plurality of current transformers are a first current transformer 61, a second current transformer 62, and a third current transformer 63 respectively. The first current transformer 61 and the second current transformer 62 are arranged at intervals along a second direction, the third current transformer 63 is located on a side of the first current transformer 61 facing the rear portion of the gas tank 2, and the first direction is perpendicular to the second direction; specifically, all three current transformers are arranged in the sealed cavity 21 of the gas tank 2 and connected to the bottom wall of the sealed cavity 21, and their power-side terminals 611 are electrically connected to the outlet end of the pole 52 of the vacuum circuit breaker 5, forming a current measurement and protection sampling path for the main circuit 42. The first current transformer 61 and the second current transformer 62 are arranged at intervals along the left-right direction, and the third current transformer 63 is located between the first current transformer 61 and the pressure relief chamber 1113, forming a "product-shaped" spatial layout. On the premise of ensuring the electrical independence of the three-phase current transformers, this arrangement fully utilizes the transverse gap (i.e., the installation space 1112) between the front operation chamber 1111 and the rear pressure relief chamber 1113 of the cabinet body 1, avoids the problem that the traditional "straight-line" transverse arrangement occupies too much left-right space, effectively reduces the overall occupied width of the current transformer group 6 in the left-right direction, enables it to be adapted to a compact switch cabinet with a standard cabinet width (such as 600mm), and solves the problem that installation cannot be performed due to the large volume of the current transformer (such as a small transformation ratio current transformer); meanwhile, this layout reasonably utilizes the rear space of the cabinet body 1, avoids interference with front components such as the operating mechanism 41 and the three-position switch 4, improves the internal space utilization rate, enhances the adaptability of the switch cabinet to different types of current transformers, and is conducive to realizing standardized product design and multi-scenario application. Moreover, with this arrangement, even if the transformation ratio of the current transformer is changed due to project requirements, which leads to an increase in its overall dimension, the maximum installation width of the first current transformer 61 and the second current transformer 62 is still limited within the transverse dimension allowed by the cabinet body 1, and will not exceed the overall width (left-right direction) of the cabinet body 1, ensuring that the equipment can be smoothly installed in a standard bay, and avoiding the redesign of the cabinet body 1 or obstruction of on-site installation caused by the size adjustment of components.

[0054] See Figure 1 and Figure 2, in one embodiment, the plurality of third cable receptacles 731 are a first outlet receptacle 7311, a second outlet receptacle 7312 and a third outlet receptacle 7313 respectively. The first outlet receptacle 7311 and the second outlet receptacle 7312 are respectively located on two opposite sides of the third current transformer 63 along the second direction, and the third outlet receptacle 7313 is located on a side of the third current transformer 63 facing the rear portion of the gas tank 2; specifically, the third cable receptacle 731 is electrically connected to the load-side terminal 612 of the current transformer, and is configured to lead out the current of the main circuit 42 to the cable plug connector 8 on the top of the cable compartment 11122, so as to be further connected to the external power cable 400. The first outlet receptacle 7311 and the second outlet receptacle 7312 respectively correspond to the first current transformer 61 and the second current transformer 62, and are arranged on the left and right sides of the third current transformer 63; the third outlet receptacle 7313 corresponds to the third current transformer 63, and is arranged on the rear side of the third current transformer 63 and adjacent to the pressure relief chamber 1113, forming a "pin-shaped" spatial layout, such that the overall layout of the third cable receptacles 731 matches the current transformers arranged in a "pin-shaped" arrangement. The above structure is applied to a conventional incoming / outgoing switchgear to implement outlet connection of three-phase power cables 400. The structure fully utilizes the space in the front-rear direction of the cable compartment 11122, avoids the large lateral spacing required by the traditional left-middle-right "in-line" arrangement, reduces the arrangement width between the three-phase cables, and makes on-site cable laying more compact; meanwhile, the layout enables the three-phase cables to naturally gather during access, without separating the wiring by a large margin, which reserves sufficient operating space and installation positions for additionally installing a zero-sequence current transformer at the root of the cables, significantly improves the installation convenience and wiring reliability of the zero-sequence current transformer, and solves the problems of construction difficulty and limited additional accessory installation caused by excessively high cable plug positions and three-phase dispersed arrangement in traditional switchgears.

[0055] Please refer to Figure 2 and Figure 4In one embodiment, the bottom of the cabinet 1 is provided with a power cable opening 112 and a control cable opening. The power cable opening 112 is used for the power cable 400 to pass through. There are at least two control cable openings, including a first control cable opening 113 and a second control cable opening 114. The first control cable opening 113 is used for the first control cable to pass through, and the second control cable opening 114 is used for the second control cable to pass through. The operating mechanism 41 is used to be electrically connected to the first control cable, and the operating device 51 is used to be electrically connected to the second control cable. Specifically, in this embodiment, the power cable opening 112 is located below the cable compartment 11122 and aligned with the cable plug 8 to ensure that the power cable 400 is smoothly introduced. The two independent control cable openings are located below the operating compartment 1111 and correspond to different control function circuits, realizing the separate arrangement of control signals. By setting independent power cable openings 112 and control cable openings, the power cable 400 and control cable are physically separated, avoiding electromagnetic interference between high-voltage and low-voltage lines and improving the stability of the control circuit. Simultaneously, the control cable openings are divided into a first control cable opening 113 and a second control cable opening 114, corresponding to the operating mechanism 41 and operating device 51 respectively. This ensures clear control signal paths and orderly wiring, facilitating on-site construction, commissioning, and subsequent maintenance. It solves the wiring chaos and maintenance difficulties caused by the centralized introduction of control cables in traditional switchgear, improving the overall maintainability and operational reliability of the gas-insulated switchgear 100. Furthermore, the positions and dimensions of the power cable opening 112, the first control cable opening 113, and the second control cable opening 114 precisely match the corresponding openings on the bottom of the prefabricated cabin, achieving precise docking of the gas-insulated switchgear 100 and the prefabricated cabin during installation, avoiding on-site drilling or adjustments and improving assembly efficiency.

[0056] Please see Figure 3 and Figure 4, in one embodiment, the plurality of current transformers are a first current transformer 61, a second current transformer 62 and a third current transformer 63 respectively, wherein the first current transformer 61, the second current transformer 62 and the third current transformer 63 are arranged at intervals along a second direction, and the first direction and the second direction are vertically arranged; specifically, all three current transformers are arranged in the sealed cavity 21 of the gas tank 2 and connected to the bottom wall of the sealed cavity 21, and power side terminals 611 of the current transformers are electrically connected to the outlet end of the pole 52 of the vacuum circuit breaker 5 through a copper bar, forming a measurement and protection sampling circuit for the current of the main circuit 42. The structure is applied to a main transformer incoming switch cabinet, and is used for accurately monitoring large current from a main transformer and implementing relay protection. The three current transformers adopt an in-line arrangement mode of straight line arrangement along the second direction (left-right direction), so that three-phase current transformers are symmetrically distributed, the phase-to-phase distances are uniform, the lengths of electrical connection paths are similar, and the magnetic field distribution is balanced, which is beneficial to reducing phase-to-phase interference and improving measurement accuracy and operation stability; meanwhile, the arrangement mode is convenient for realizing direct正对 connection with the second electrical interface 72 at the top (for connecting a tube bus adapter 300), reduces the bending angle of the copper bar, improves conduction reliability and mechanical strength, realizes the regularity of component layout and the symmetry of electrical performance, eliminates the necessity of space adaptation in a triangular layout, simplifies the internal structure design, improves wiring consistency and maintenance convenience, and meets the requirements of high reliability and long-term stable operation under main transformer incoming working conditions.

[0057] See Figure 1 and Figure 3In one embodiment, multiple first cable connectors 721 are arranged at intervals along a second direction, and multiple second cable connectors 722 are arranged at intervals along the second direction, with the first and second directions perpendicular to each other. Specifically, both the first cable connectors 721 and the second cable connectors 722 are located at the second electrical interface 72 on the top of the gas box 2, for detachable connection to external functional modules. The first cable connectors 721 are used to connect to the surge arrester 200 to achieve overvoltage protection; the second cable connectors 722 are used to connect to the busbar adapter 300 to achieve docking with the busbar 500. Both correspond one-to-one with the number of current transformers and are arranged at intervals along the left and right directions, forming a "I"-shaped layout. This structure can be applied to both conventional incoming and outgoing line switchgear and main transformer incoming line switchgear. In applications requiring main transformer incoming lines or busbar connections, the top-entry point of the main circuit is achieved by installing a second cable connector 722 and connecting it to a busbar adapter 300. In applications requiring surge arresters 200, three-phase overvoltage protection is achieved by installing a first cable connector 721 and connecting it to a surge arrester 200. Since the first cable connector 721 and the second cable connector 722 share the same set of top interface positions, surge arresters 200 or busbar adapters 300 can be installed according to actual needs without altering the cabinet structure, allowing for flexible configuration of functional modules. This design standardizes and modularizes the layout of the second electrical interface 72, improving the switchgear's versatility in different application scenarios and the ease of on-site installation, meeting the requirements for high reliability, easy maintenance, and rapid deployment under conventional incoming / outgoing line and main transformer incoming line conditions.

[0058] Please see Figure 3 and Figure 4 In one embodiment, a pressure relief hole 11131 communicating with the external environment is provided at the bottom of the pressure relief chamber 1113. Specifically, the pressure relief hole 11131 is connected to the pressure relief port 22 on the gas box 2 through the pressure relief chamber 1113, forming a clear pressure relief channel to ensure that high-pressure gas can be discharged quickly and directionally in the event of a fault, avoiding pressure accumulation inside the cabinet. The pressure relief burst valve 3 is located inside the pressure relief chamber 1113 and seals the pressure relief port 22. When an arc fault occurs inside the gas-insulated switchgear 100, and the insulating gas medium in the sealed cavity 21 of the gas box 2 rapidly expands due to high temperature, causing a sudden pressure rise, the pressure relief burst valve 3 ruptures. High-pressure gas and arc combustion products enter the pressure relief chamber 1113 through the pressure relief port 22 and are quickly discharged to the external environment of the cabinet 1 through the pressure relief hole 11131 at the bottom of the pressure relief chamber 1113, thereby effectively releasing internal pressure and preventing the cabinet 1 from exploding or severely deforming due to overpressure. Meanwhile, this design directs the pressure relief direction to the bottom outer side of cabinet 1, away from operators and adjacent equipment, improving safety protection capabilities in case of failure, ensuring the safety of on-site personnel and surrounding equipment, and enhancing the overall safety and reliability of gas-insulated switchgear 100.

[0059] Please see Figure 1 and Figure 3 In one embodiment, the cabinet 1 includes a shell 11, a first partition 12, a second partition 13, a third partition 14, and a fixing device 15. The shell 11 has a cavity 111 inside. The first partition 12 and the second partition 13 are both connected to the cavity wall of the cavity 111, so that the cavity 111 is divided into an operating room 1111, an installation space 1112, and a pressure relief chamber 1113 in a third direction. The first partition 12 and the second partition 13 are both connected to the third partition 14, so that the installation space 1112 is divided into an installation cavity 11121 and a cable cavity 11122 in a first direction. The gas box 2 is detachably connected to the cavity wall of the installation cavity 11121 through the fixing device 15. Specifically, the cabinet 1 divides the internal cavity 111 of the cabinet 1 into functional zones through multiple partitions, realizing the independent isolation of high-voltage main circuit components, operating mechanism 41, outgoing cables, and pressure relief channels, ensuring independent operation of each area, avoiding mutual interference, and improving safety and electromagnetic compatibility. By using the fixing device 15 to detachably install the gas box 2 into the mounting cavity 11121, the stability of the gas box 2 during operation is ensured, and it is easy to disassemble and reassemble as a whole during transportation or maintenance. This improves assembly flexibility and maintenance efficiency, facilitates factory prefabrication, rapid on-site installation, and subsequent replacement, and enhances the modularity of the switchgear and the convenience of engineering applications. In this embodiment, to ensure connection reliability, the gas box 2 can be fixed at multiple points to the top of the housing 11, the first partition 12, and the second partition 13 through the fixing device 15, ensuring stable installation and strong vibration resistance. The fixing device 15 can adopt detachable methods such as bolt connection, snap-fit ​​structure, or quick-installation clamp, which facilitates assembly and maintenance. In addition, the operating mechanism 41 of the three-position switch 4 and the operating device 51 of the vacuum circuit breaker 5 are both set in the operating chamber 1111 and mechanically connected to the first partition 12, realizing reliable positioning and structural support of the control mechanism and control device.

[0060] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A gas-insulated switchgear, characterized in that, The gas-insulated switchgear includes: The cabinet has an internal mounting cavity. A gas box, wherein the gas box is disposed within the mounting cavity, the gas box having a sealed cavity filled with an insulating gas medium; A three-position switch, the three-position switch including a main circuit, the main circuit being disposed within the sealed cavity; A vacuum circuit breaker, the vacuum circuit breaker including a pole, the pole being disposed in the sealed cavity, the output terminal of the main circuit being electrically connected to the input terminal of the pole; A current transformer group, comprising a current transformer located inside the sealed cavity and connected to the bottom wall of the sealed cavity, wherein the current transformer is provided with a power supply side terminal and a load side terminal, and the power supply side terminal is electrically connected to the output terminal of the pole. An electrical interface assembly includes a first electrical interface and a second electrical interface, both located on the top of the gas box, with the second electrical interface positioned near the rear of the gas box. The main circuit's input terminal is electrically connected to the first electrical interface, which is used to introduce external power. The second electrical interface includes a first cable socket and a second cable socket. The gas box can be detachably connected to either the first or second cable socket. Either the first or second cable socket can be electrically connected to the load-side terminal. The first cable socket is used to connect to a surge arrester, and the second cable socket is used to connect to a busbar adapter.

2. The gas-insulated switchgear as described in claim 1, characterized in that, The number of current transformers is multiple. The number of first cable sockets is the same as the number of current transformers and they are arranged in a one-to-one correspondence. The number of second cable sockets is the same as the number of current transformers and they are arranged in a one-to-one correspondence.

3. The gas-insulated switchgear as described in claim 2, characterized in that, The cabinet also includes a cable compartment, and the cable compartment and the mounting cavity are arranged sequentially along a first direction. The electrical interface assembly further includes a third electrical interface, which includes a third cable female connector. The third cable female connector is connected to the bottom wall of the sealed cavity and is electrically connected to the load-side terminal. A cable plug is provided on the top of the cable compartment and is connected to the third cable female connector. The cable plug is used to connect to a power cable. The number of the third cable sockets is the same as the number of the current transformers and they are arranged in a one-to-one correspondence. The number of cable plugs is the same as the number of the current transformers and they are arranged in a one-to-one correspondence.

4. The gas-insulated switchgear as described in claim 3, characterized in that, The plurality of current transformers are a first current transformer, a second current transformer, and a third current transformer. The first current transformer and the second current transformer are arranged at intervals along a second direction. The third current transformer is located on the side of the first current transformer facing the rear of the gas box. The first direction is perpendicular to the second direction.

5. The gas-insulated switchgear as described in claim 4, characterized in that, The plurality of third cable connectors are respectively a first outgoing connector, a second outgoing connector and a third outgoing connector. The first outgoing connector and the second outgoing connector are respectively located on both sides of the third current transformer that are arranged opposite to each other along the second direction. The third outgoing connector is located on the side of the third current transformer facing the rear of the gas box.

6. The gas-insulated switchgear as described in claim 3, characterized in that, The bottom of the cabinet is provided with a power cable opening for the power cable to pass through.

7. The gas-insulated switchgear as described in claim 2, characterized in that, The plurality of current transformers are a first current transformer, a second current transformer, and a third current transformer. The first current transformer, the second current transformer, and the third current transformer are arranged at intervals along a second direction, which is perpendicular to the first direction.

8. The gas-insulated switchgear as described in claim 2, characterized in that, Multiple second cable female connectors are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction.

9. The gas-insulated switchgear as described in any one of claims 1 to 8, characterized in that, The cabinet's interior is divided into an operating room, an installation space, and a pressure relief chamber along a third direction. The installation space is further divided into an installation cavity and a cable compartment along a first direction. The third direction is perpendicular to the first direction. The three-position switch also includes an operating mechanism connected to the main circuit, which is located in the operating room. The vacuum circuit breaker also includes an operating device connected to the pole, which is located in the operating room. The gas-insulated switchgear also includes a pressure relief burst valve located in the pressure relief chamber. The gas box has a pressure relief port communicating with the pressure relief chamber, and the pressure relief burst valve is connected to the gas box to seal or open the pressure relief port.

10. The gas-insulated switchgear as described in claim 9, characterized in that, The cabinet includes a shell, a first partition, a second partition, a third partition, and a fixing device. The shell has an interior cavity. The first partition and the second partition are both connected to the cavity wall, so that the cavity is divided into the operating room, the installation space, and the pressure relief chamber in sequence along the third direction. The first partition and the second partition are both connected to the third partition, so that the installation space is divided into the installation cavity and the cable chamber in sequence along the first direction. The air box is detachably connected to the cavity wall of the installation cavity through the fixing device. And / or, The bottom of the pressure relief chamber is provided with a pressure relief hole that communicates with the external environment; And / or, The bottom of the housing is provided with a control cable opening, and the number of the control cable openings is at least two. The at least two control cable openings include a first control cable opening and a second control cable opening. The first control cable opening is used for a first control cable to pass through, and the second control cable opening is used for a second control cable to pass through. The operating mechanism is used to be electrically connected to the first control cable, and the operating device is used to be electrically connected to the second control cable.

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