Environment-friendly gas insulated cubicle and power distribution equipment

Abstract

The application relates to the technical field of power distribution equipment, and provides an environment-friendly gas insulated cubicle and power distribution equipment. The environment-friendly gas insulated cubicle comprises a cabinet body, control instrument rooms, mechanism operation rooms, cable outlet rooms, extension busbar rooms and gas charging tank rooms which are respectively arranged at the front upper part, the front middle part, the front lower part, the rear upper part and the rear middle part of the cabinet body, wherein the gas charging tank room is a cross-shaped sealed tank body structure, the main body of which is integrally formed through two cylindrical shells which are orthogonal and through-penetrating, the gas charging tank room is provided with disconnectors, vacuum circuit breakers and environment-friendly insulation gas which is filled with a pressure higher than that of the atmosphere, the disconnectors and the vacuum circuit breakers are connected with each other and arranged in parallel to form an integrated structure; the cubicle realizes the miniaturization of the equipment, the stability of insulation performance, the adaptation to high-altitude and small-sized box-type transformer scenes, and breaks through the technical bottleneck that the traditional environment-friendly cubicle is difficult to be applied on a large scale.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, and more specifically, to an environmentally friendly gas-insulated gas-filled switchgear and power distribution equipment. Background Technology

[0002] In the field of medium and high voltage power distribution equipment, gas-insulated switchgear, such as 40.5kV gas-insulated switchgear, is one of the most crucial switchgear devices. With increasingly stringent environmental protection requirements, 40.5kV-class environmentally friendly gas-insulated switchgear, which uses clean air as the insulating medium to replace traditional sulfur hexafluoride (SF6) gas, has become an important development direction for high voltage switchgear.

[0003] However, the insulating properties of environmentally friendly gases are generally significantly lower than those of sulfur hexafluoride (SF6) gas. Therefore, to achieve the required insulation level at 40.5kV, traditional solutions using environmentally friendly gases for gas-filled switchgear often face a dilemma: either increase the insulation distance between conductive components or increase the filling pressure. The former directly results in a large equipment size; conventional 40.5kV environmentally friendly gas-filled switchgear generally suffers from excessive width, height, and depth, making it difficult to install in space-constrained miniaturized prefabricated substations, especially containerized prefabricated substations. The latter poses a severe challenge to the pressure-bearing capacity and structural stability of the gas-filled switchgear's gas box. Conventional square-box welded structures are prone to deformation under high pressure, affecting sealing reliability and insulation stability. The insulation performance of the isolation joints is unreliable, and the pressure affects stable operation at high altitudes. These technical bottlenecks collectively limit the widespread large-scale application of environmentally friendly gas-filled switchgear. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to solve the technical defects of traditional environmentally friendly gas-filled switchgear, such as large size, insufficient pressure bearing capacity of the gas box leading to poor insulation reliability, and difficulty in adapting to high-altitude areas and applying miniaturized box-type substation equipment.

[0005] This invention provides an environmentally friendly gas-insulated gas-filled switchgear, comprising a cabinet body. The cabinet body contains a control instrument room, a mechanism operation room, a cable outlet room, an expansion busbar room, and a gas filling tank room, respectively located in the upper front, middle front, lower front, upper rear, and middle rear sections of the cabinet body. The gas filling tank chamber is a cross-shaped sealed tank structure. Its main body is formed by two cylindrical shells orthogonally connected and integrally formed. The gas filling tank chamber is equipped with a disconnect switch, a vacuum circuit breaker and an environmentally friendly insulating gas filled with pressure higher than atmospheric pressure. The disconnect switch and the vacuum circuit breaker are connected to each other and are arranged in parallel as an integral structure. The operating room of the mechanism is equipped with an isolating switch operating mechanism and a vacuum circuit breaker operating mechanism that are respectively driven and connected to the isolating switch and the vacuum circuit breaker. An extension busbar is installed indoors, and the extension busbar is connected to the disconnecting switch; The cable outlet chamber is provided with an outlet port, which is connected to the vacuum circuit breaker.

[0006] Optionally, the disconnecting switch is a direct-acting three-position disconnecting switch, which includes a moving contact, a connecting contact, a grounding contact, a moving guide rod, and a transmission assembly. The operating mechanism of the disconnecting switch is drivenly connected to the transmission assembly. One end of the moving guide rod is connected to the moving contact, and the other end is connected to the transmission assembly. The transmission assembly is used to drive the moving guide rod to move linearly, and the ends of the moving contact, the connecting contact, and the grounding contact are all set with arc structures.

[0007] Optionally, the disconnector operating mechanism includes a drive gear and a transmission shaft. The drive gear is driven to the transmission shaft to rotate. The transmission shaft passes through the front end of the inflation tank chamber and is connected to the transmission assembly. The connection between the transmission shaft and the inflation tank chamber is sealed by a dynamic sealing assembly.

[0008] Optionally, the vacuum circuit breaker includes a pole made of epoxy resin, a vacuum interrupter is provided inside the pole, and an upper conductor and a lower conductor are led out from the vacuum interrupter. The upper conductor is connected to the connecting contact seat, the lower conductor is connected to the outgoing port, and the protruding part of the pole is provided with an annular skirt structure.

[0009] Optionally, the environmentally friendly gas-insulated gas-filled switchgear further includes an interlocking mechanism, which includes a crank arm, a connecting rod assembly, and a baffle that are sequentially connected in transmission. The crank arm is disposed on the vacuum circuit breaker operating mechanism and is connected in transmission to its operating end. The baffle is disposed on the disconnecting switch operating mechanism and is used to block the action of its operating end.

[0010] Optionally, the environmentally friendly gas-insulated gas-filled switchgear further includes a busbar connection assembly, which includes a cylindrical conductor, a semi-circular conductor, and a connector. The two ends of the cylindrical conductor and the semi-circular conductor are respectively provided with through holes in the radial direction. The two semi-circular conductors are used to hug each other at the axial docking point between the cylindrical conductor and the busbar to be connected, and the connector is used to connect to the through hole.

[0011] Optionally, at least one end of the air tank chamber has a square ring plate extending radially from its outer circumference. The square ring plate is connected to the cabinet body, and the lower front part of the air tank chamber is provided as a flat plate, which is attached to the cable outlet chamber.

[0012] Optionally, an inlet sleeve passes through the upper end of the air tank chamber and the lower end of the extended busbar chamber, and an outlet sleeve passes through the rear end of the flat plate and the cable outlet chamber. The inlet sleeve and the outlet sleeve are used to seal the inlet and outlet, respectively.

[0013] Optionally, an observation window is provided at the rear end of the inflation tank chamber, and a pressure relief device is provided at the lower end of the inflation tank chamber, with the pressure relief device facing the lower rear part of the cabinet.

[0014] Compared with related technologies, the environmentally friendly gas-insulated gas-filled switchgear provided by the present invention has the following technical advantages: The environmentally friendly gas-insulated gas-filled switchgear provided by this invention utilizes an orderly, modular layout structure dividing the cabinet into a control instrument room, a mechanism operation room, a cable outlet room, an expansion busbar room, and a gas filling tank room. This orderly arrangement of functional components avoids the spatial redundancy caused by the dispersed components of traditional equipment, facilitating the miniaturization of the overall size and installation. Furthermore, by designing the gas filling tank room as a cross-shaped sealed tank structure formed by two orthogonally connected cylindrical shells, the pressure-bearing capacity of the cylindrical shells is significantly improved compared to the traditional box-type structure. It can stably withstand the pressure of environmentally friendly insulating gas higher than atmospheric pressure, effectively solving the problem of insufficient pressure bearing capacity and easy deformation of traditional gas boxes. At the same time, the cross-shaped structure can adapt to the installation requirements of disconnecting switches and vacuum circuit breakers, reducing the overall space occupied by the tank. Moreover, by connecting the disconnecting switches and vacuum circuit breakers and setting them as a parallel integrated structure, the conductive path and installation distance between them are greatly shortened. Compared with the traditional split layout, the main switch can be reduced. By reducing module size and further optimizing the overall dimensions of the equipment, it can be adapted to miniaturized prefabricated substations with limited space, especially containerized prefabricated substations. Moreover, by filling the gas tank chamber with environmentally friendly insulating gas (such as pure dry air) at a pressure higher than atmospheric pressure, combined with the high airtightness of the cross-shaped sealed tank, stable insulation performance can be maintained in high-altitude, low-pressure environments, solving the problem of poor insulation reliability caused by insufficient air pressure in traditional equipment. At the same time, by connecting the expansion busbar in the expansion busbar chamber to the disconnecting switch and the outgoing port in the cable outlet chamber to the vacuum circuit breaker, a complete current path is formed. Furthermore, the disconnecting switch operating mechanism and the vacuum circuit breaker operating mechanism in the mechanism operating chamber drive the disconnecting switch and the vacuum circuit breaker respectively, ensuring the reliability of circuit on / off control. Ultimately, the goal of miniaturizing the equipment, ensuring stable insulation performance, and adapting to high-altitude and miniaturized prefabricated substation scenarios is achieved, breaking through the technical bottleneck that makes it difficult for traditional environmentally friendly gas-filled switchgear to be applied on a large scale.

[0015] In addition, the present invention also provides a power distribution device, including the environmentally friendly gas-insulated gas-filled switchgear as described above.

[0016] Compared with related technologies, the power distribution equipment provided by the present invention, by setting the environmentally friendly gas-insulated gas-filled cabinet as described above, has roughly the same technical effect as the aforementioned environmentally friendly gas-insulated gas-filled cabinet, and will not be repeated here. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the environmentally friendly gas-insulated gas-filled cabinet according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the right cross-sectional structure of the environmentally friendly gas-insulated gas-filled cabinet according to an embodiment of the present invention; Figure 3 This is a partial structural diagram of the environmentally friendly gas-insulated gas-filled cabinet according to an embodiment of the present invention. Figure 1 ; Figure 4 This is a partial structural diagram of the environmentally friendly gas-insulated gas-filled cabinet according to an embodiment of the present invention. Figure 2 ; Figure 5 for Figure 4 A top-view structural diagram; Figure 6 This is a partial structural diagram of the environmentally friendly gas-insulated gas-filled cabinet according to an embodiment of the present invention. Figure 3 ; Figure 7 for Figure 6 A top-view structural diagram; Figure 8 This is a three-dimensional structural diagram of the busbar connection assembly according to an embodiment of the present invention; Figure 9 This is an exploded view of the busbar connection assembly according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the planar structure of the air tank chamber according to an embodiment of the present invention; Figure 11 This is a three-dimensional structural diagram of the air tank chamber according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 10-Control Instrument Room, 20-Mechanism Operating Room, 21-Disconnecting Switch Operating Mechanism, 211-Drive Gear, 212-Drive Shaft, 22-Vacuum Circuit Breaker Operating Mechanism, 30-Cable Outgoing Room, 31-Outgoing Port, 32-Outgoing Bushing, 33-Surge Arrester, 34-Current Transformer, 40-Extension Busbar Room, 41-Extension Busbar, 42-Incoming Bushing, 50-Gas Filling Tank Room, 51-Disconnecting Switch, 511-Moving Contact, 512-Connecting Contact, 513-Grounding Contact, 514-Moving Guide Rod, 51 5-Transmission assembly, 52-Vacuum circuit breaker, 521-Vacuum interrupter, 522-Upper conductor, 523-Lower conductor, 524-Skirt structure, 525-Insulating tie rod, 53-Dynamic sealing assembly, 54-Square ring plate, 55-Plate, 56-Observation window, 57-Pressure relief device, 60-Interlocking mechanism, 61-Crank arm, 62-Linkage assembly, 63-Baffle, 70-Busbar connection assembly, 71-Cylindrical conductor, 72-Semi-circular conductor, 73-Connector, 74-Pressure seat, 75-Busbar to be connected. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0021] In the description of this invention, the terms "up," "down," "left," "right," "top," "bottom," "front," "back," "inner," and "outer" are used to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. These are used solely for the purpose of describing the invention and are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention. Furthermore, a coordinate system XYZ is used herein, where the positive direction of the X-axis represents the right direction, the negative direction of the X-axis represents the left direction, the positive direction of the Y-axis represents the forward direction, the negative direction of the Y-axis represents the backward direction, the positive direction of the Z-axis represents the upward direction, and the negative direction of the Z-axis represents the downward direction.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0024] To solve the above technical problems, such as Figures 1 to 3 , Figure 10 and Figure 11 As shown, this embodiment of the invention provides an environmentally friendly gas-insulated gas-filled switchgear, including a cabinet body. The cabinet body contains a control instrument room 10, a mechanism operation room 20, a cable outlet room 30, an extension busbar room 40, and a gas filling tank room 50, respectively located in the upper front, middle front, lower front, upper rear, and middle rear sections of the cabinet body. The gas filling tank chamber 50 is a cross-shaped sealed tank structure. Its main body is formed by two cylindrical shells orthogonally connected and integrally formed. The gas filling tank chamber 50 is equipped with a disconnect switch 51, a vacuum circuit breaker 52 and an environmentally friendly insulating gas filled with a pressure higher than atmospheric pressure. The disconnect switch 51 and the vacuum circuit breaker 52 are connected to each other and are arranged in parallel as an integral structure. The operating room 20 is equipped with an isolation switch operating mechanism 21 and a vacuum circuit breaker operating mechanism 22, which are respectively driven and connected to the isolation switch 51 and the vacuum circuit breaker 52. An expansion busbar 41 is provided in the expansion busbar compartment 40, and the expansion busbar 41 is connected to the disconnecting switch 51. The cable outlet chamber 30 is provided with an outlet port 31, which is connected to the vacuum circuit breaker 52.

[0025] It should be noted that the cabinet as a whole has a box-like structure, and its upper front refers to the upper part of the front side of the cabinet, such as... Figure 1 and Figure 2As shown, the positive Y-axis points forward, and the negative Y-axis points backward; the positive Z-axis points upward, and the negative Z-axis points downward. The division of the cabinet's functional compartments isolates the primary high-voltage section, secondary control section, and operating mechanism, ensuring operational safety and facilitating maintenance. In particular, the structure is more compact and rational, saving installation space and making the overall design more miniaturized. The environmentally friendly insulating gas is preferably pure, dry air, with a minimum functional pressure of 0.16 MPa and a rated operating pressure of 0.22 MPa. This pressure setting ensures the requirements for power frequency insulation (95 kV between phases and to ground, 118 kV for isolation breaks) and lightning protection insulation (185 kV between phases and to ground, 215 kV for isolation breaks) at a voltage level of 40.5 kV, while avoiding excessive load on the filling tank chamber 50 due to excessive pressure. The cross-shaped sealed tank structure can be integrally formed by welding or casting. During welding, a full-penetration weld is used at the junction of the two cylindrical shells to ensure airtightness and structural strength. For casting, aluminum alloy can be used, which completely eliminates weld seams and further improves structural uniformity. This structure allows all primary conductive components to be sealed within a single air chamber, simplifying the sealing structure. Its rated pressure resistance is not less than 0.4 MPa, effectively preventing tank deformation and making it suitable for high-altitude environments up to 5000 meters. The disconnector 51 and vacuum circuit breaker 52 are interconnected and arranged parallel to each other as a single unit. This means that the disconnector 51 and vacuum circuit breaker 52 are mechanically fixed and electrically directly conductive, with their main axes parallel in space and horizontally arranged, forming a structural functional unit. This facilitates the orderly layout of the overall functional modules and saves space.

[0026] Specifically, the disconnector 51 and the vacuum circuit breaker 52 are electrically connected through a cylindrical conductor, and the integrated structure formed by the two is only about 359mm high, which greatly reduces the space compared with the traditional split layout. The extension busbar 41 can be a cylindrical copper busbar, used to connect other distribution cabinets or for integrated connection. It can be fixed to the connection contact 512 of the disconnector 51 through, for example, the busbar connection assembly 70, to ensure the stability of current transmission. The cable outlet compartment 30 is also equipped with a current transformer 34 and a surge arrester 33. The outlet port 31 is used to connect to external cables or connect to the power grid. The current transformer 34 is set at the connection section between the outlet port 31 and the external cable to monitor the outlet current and transmit signals to the control instrument room 10, which facilitates timely adjustment in case of emergencies. The surge arrester 33 is connected in parallel with the outlet port 31 to prevent damage to the equipment by lightning overvoltage.

[0027] In this embodiment, the environmentally friendly gas-insulated gas-filled cabinet provided utilizes an orderly modular layout structure, dividing the cabinet into a control instrument room 10, a mechanism operation room 20, a cable outlet room 30, an extension busbar room 40, and a gas filling tank room 50. This orderly layout of functional components avoids spatial redundancy caused by the dispersed components of traditional equipment, facilitating smaller overall size and installation. Furthermore, by designing the gas filling tank room 50 as a cross-shaped sealed tank structure formed by two orthogonally connected cylindrical shells, the pressure-bearing capacity of the cylindrical shell is significantly improved compared to the traditional square box structure. It can stably withstand environmentally friendly insulating gas pressure higher than atmospheric pressure, effectively solving the problem of insufficient pressure bearing capacity of traditional gas boxes. The cross-shaped structure addresses the issue of deformation while also adapting to the installation requirements of the disconnector switch 51 and the vacuum circuit breaker 52, reducing the overall space occupied by the tank. Furthermore, by connecting the disconnector switch 51 and the vacuum circuit breaker 52 and setting them as a single, parallel structure, the conductive path and installation distance between them are significantly shortened. Compared to the traditional split layout, this reduces the volume of the main switch module, further optimizing the overall size of the equipment. This allows it to adapt to space-constrained miniaturized prefabricated substation equipment, especially containerized prefabricated substation equipment. Moreover, the cross-shaped sealed tank structure can also achieve a reasonable distribution and adaptation with other functional chambers, such as the control instrument chamber 10, the mechanism operation chamber 20, and the cable outlet chamber 30. The four ends of the cross-shaped sealed tank structure can be arranged to form a concave area with the opening facing the rear. The front end of the cross-shaped sealed tank structure is inserted into this concave area and is adjacent to the control instrument room 10, the mechanism operation room 20, and the cable outlet room 30, respectively. This not only improves the utilization rate of the entire gas-filling cabinet space and further optimizes the overall size of the equipment, but also facilitates the connection between the disconnecting switch 51 and vacuum circuit breaker 52 inside the cross-shaped sealed tank structure and the structures inside the mechanism operation room 20 and the cable outlet room 30. In addition, by filling the gas-filling tank chamber 50 with an environmentally friendly insulating gas (such as pure dry air) at a pressure higher than atmospheric pressure, combined with the high airtightness of the cross-shaped sealed tank, it can be used in high-altitude, low-pressure environments. It maintains stable insulation performance under various conditions, solving the problem of poor insulation reliability caused by insufficient air pressure in traditional equipment. At the same time, by connecting the expansion bus 41 in the expansion bus compartment 40 to the disconnecting switch 51 and the outgoing port 31 in the cable outgoing compartment 30 to the vacuum circuit breaker 52, a complete current path is formed. Furthermore, the disconnecting switch operating mechanism 21 and the vacuum circuit breaker operating mechanism 22 in the mechanism operating compartment 20 drive the disconnecting switch 51 and the vacuum circuit breaker 52 respectively, ensuring the reliability of circuit on / off control. Ultimately, it achieves the goals of miniaturization, stable insulation performance, and adaptability to high-altitude and miniaturized substation scenarios, breaking through the technical bottleneck that makes it difficult for traditional environmentally friendly gas-filled switchgear to be applied on a large scale.

[0028] Optionally, such as Figures 2 to 5As shown, the disconnecting switch 51 is a direct-acting three-position disconnecting switch, which includes a moving contact 511, a connecting contact 512, a grounding contact 513, a moving guide rod 514, and a transmission assembly 515. The disconnecting switch operating mechanism 21 is drivenly connected to the transmission assembly 515. One end of the moving guide rod 514 is connected to the moving contact 511, and the other end is connected to the transmission assembly 515. The transmission assembly 515 is used to drive the moving guide rod 514 to move linearly. The ends of the moving contact 511, the connecting contact 512, and the grounding contact 513 are all set with a rounded structure.

[0029] Specifically, the direct-acting three-position disconnect switch refers to a switching device that achieves three states—conduction, isolation, and grounding—through linear motion. The transmission component 515 may include a screw-nut mechanism and a gear assembly that cooperate to convert rotary motion into linear motion, or similar structures. In this embodiment, a single-axis drive is used to drive three-phase synchronous motion to ensure the consistency and accuracy of the executed actions. The moving guide rod 514 is a conductive rod structure. The arc structures at the ends of the moving contact 511, connecting contact 512, and grounding contact 513 are the result of electric field simulation calculations and optimizations, which can effectively improve the electric field distribution in the contact area, prevent excessively high local field strength, and thus improve the insulation reliability of the isolation break.

[0030] In this embodiment, the transmission assembly 515 is driven by the disconnector operating mechanism 21, causing the moving guide rod 514 to move the moving contact 511 in a straight line. This achieves three-position switching: the moving contact 511 contacts the connecting contact 512 to achieve the closing position; the moving contact 511 separates from both to achieve the opening position; and the moving contact 511 contacts the grounding contact 513 to achieve the grounding position. This satisfies the requirements of circuit conduction, isolation, and grounding protection. The linear movement design of the moving guide rod 514 reduces the radial installation space compared to traditional rotary disconnectors, adapts to the cross-shaped compact structure of the gas tank chamber 50, and effectively improves the electric field distribution by setting the end of the contact to an arc structure, avoiding the corona phenomenon that is easily generated by traditional right-angle or spiked contacts. Combined with the insulating effect of environmentally friendly insulating gas, it ensures the stable insulation performance of the isolation break at a voltage level of 40.5kV, solving the problem of unreliable insulation in traditional disconnectors.

[0031] Optionally, such as Figures 2 to 5 As shown, the disconnector operating mechanism 21 includes a drive gear 211 and a transmission shaft 212. The drive gear 211 is driven to drive the transmission shaft 212 to rotate. The transmission shaft 212 passes through the front end of the inflation tank chamber 50 and is connected to the transmission assembly 515. The connection between the transmission shaft 212 and the inflation tank chamber 50 is sealed by a dynamic sealing assembly 53.

[0032] Specifically, the drive gear 211 is connected to the operating end and drive end of the disconnector operating mechanism 21, such as an electrically controlled motor, to execute drive commands by rotation. The dynamic sealing assembly 53 preferably adopts a multi-ring sealing structure formed by multiple sealing rings arranged in parallel, such as a three-layer sealing ring interlocking structure, to provide multiple sealing protection when the drive shaft 212 rotates, effectively preventing high-pressure gas leakage in the gas filling tank chamber 50.

[0033] In this embodiment, the drive gear 211 drives the transmission shaft 212 to rotate, and the transmission shaft 212 further drives the transmission assembly 515 to convert the rotational motion into the linear motion of the moving guide rod 514, thereby realizing the position switching of the disconnecting switch 51. This transmission path is simple and reliable, with high transmission efficiency, avoiding the action lag or jamming caused by multi-stage transmission. Furthermore, by setting a dynamic sealing assembly 53 at the connection between the transmission shaft 212 and the gas filling tank chamber 50, leakage of environmentally friendly insulating gas inside the tank is effectively prevented, ensuring that the gas pressure is maintained within an effective range of, for example, 0.16-0.22 MPa, avoiding the reduction of insulation performance due to pressure drop. At the same time, it prevents external moisture, dust and other impurities from entering the tank and contaminating the insulating gas, ensuring the long-term stable operation of the disconnecting switch 51 and the vacuum circuit breaker 52.

[0034] Optionally, such as Figures 2 to 7 As shown, the vacuum circuit breaker 52 includes a pole made of epoxy resin. A vacuum interrupter 521 is provided inside the pole, and an upper conductor 522 and a lower conductor 523 are led out from the vacuum interrupter 521. The upper conductor 522 is connected to the connecting contact seat 512, and the lower conductor 523 is connected to the outgoing port 31. The protruding part of the pole is provided with an annular skirt structure 524.

[0035] Specifically, the direct connection between the upper conductor 522 and the connecting contact 512, and the direct downward extension of the lower conductor 523 from the end of the vacuum interrupter 521, constitute the specific electrical connection and wiring method of the integrated switch. The annular skirt structure 524 increases the creepage distance on the pole surface, further improving the external insulation level. The moving end of the vacuum interrupter 521 is connected to the vacuum circuit breaker operating mechanism 22 located in the mechanism operating chamber 20 via the insulating pull rod 525. For example, when the vacuum circuit breaker operating mechanism 22 receives a closing command, it pushes the moving contact and stationary contact in the vacuum interrupter 521 to close through the insulating pull rod 525, and the main circuit is connected. When it receives a opening command, the vacuum circuit breaker operating mechanism 22 releases energy, and under the action of the opening spring, it drives the moving contact to quickly separate from the stationary contact through the insulating pull rod 525. In a high vacuum environment, the arc generated between the contacts is quickly extinguished when the current crosses zero, thereby realizing the circuit breaking. The insulating pull rod 525, as a transmission component connecting the mechanism operating chamber 20 and the moving end of the vacuum interrupter 521 in the sealed gas chamber, ensures the sealing of the gas chamber while achieving reliable operation.

[0036] In this embodiment, the poles of the vacuum circuit breaker 52 are encapsulated with epoxy resin, making them a whole with high mechanical strength and good insulation performance. The upper conductor 522 is directly connected to the disconnecting switch 51, eliminating the need for an additional connecting bus and shortening the conductive circuit. The straight-out structure at the end of the lower conductor 523 avoids reserving an insulation distance behind the circuit breaker, greatly reducing the depth of the gas-filled cabinet. At the same time, the skirt structure 524 on the pole significantly increases the creepage distance on the pole surface, preventing surface flashover in high-altitude, low-pressure environments. These designs together enable the vacuum circuit breaker 52 to achieve its breaking function while contributing to the miniaturization and high reliability of the entire cabinet.

[0037] Optionally, such as Figure 2 and Figure 3 As shown, the environmentally friendly gas-insulated gas-filled switchgear also includes an interlocking mechanism 60. The interlocking mechanism 60 includes a crank arm 61, a connecting rod assembly 62, and a baffle 63 that are connected in sequence. The crank arm 61 is disposed on the vacuum circuit breaker operating mechanism 22 and is connected in transmission to its operating end. The baffle 63 is disposed on the disconnecting switch operating mechanism 21 and is used to block the action of its operating end.

[0038] Specifically, the interlocking mechanism 60 refers to a device that controls the operation sequence through mechanical linkage, and can be implemented by combining metal components and transmission parts. For example, the crank arm 61 is an L-shaped metal plate, one end of which is fixed to the operating shaft of the vacuum circuit breaker operating mechanism 22 by a pin, and the other end is hinged to one end of the connecting rod assembly 62. The connecting rod assembly 62 may include multiple connecting rods and intermediate joints. The other end of the connecting rod assembly 62 is hinged to a baffle 63. The baffle 63 is a plate structure that can block or obstruct, for example, the operating end of the disconnecting switch operating mechanism 21. Specifically, the command that can be executed is, for example, that the crank arm 61 rotates with the operating shaft of the vacuum circuit breaker operating mechanism 22, and the motion is transmitted to the baffle 63 through the connecting rod assembly 62. When the vacuum circuit breaker 52 is in the closed position, the baffle 63 will block the operating hole or operating rod path of the disconnecting switch operating mechanism 21, preventing it from being operated, thereby achieving a forced mechanical interlock of "when the circuit breaker is closed, the disconnecting switch cannot be operated". Of course, the specific structural form and implementation method of the interlocking mechanism 60 can be designed according to actual needs.

[0039] In this embodiment, by setting the interlocking mechanism 60, a strict operating logic sequence between the disconnecting switch 51 and the vacuum circuit breaker 52 is ensured, fundamentally eliminating the risk of misoperation of the disconnecting switch 51 under load, and greatly improving the safety of equipment operation and personnel operation.

[0040] Optionally, such as Figure 2 , Figure 8 and Figure 9 As shown, the environmentally friendly gas-insulated gas-filled switchgear also includes a busbar connection assembly 70. The busbar connection assembly 70 includes a cylindrical conductor 71, a semi-circular arc conductor 72, and a connector 73. The two ends of the cylindrical conductor 71 and the semi-circular arc conductor 72 are respectively provided with through holes in the radial direction. The two semi-circular arc conductors 72 are used to hug each other at the axial docking point of the cylindrical conductor 71 and the busbar 75 to be connected, and the connector 73 is used to connect to the through hole.

[0041] Specifically, the busbar 75 to be connected is the busbar in the equipment that needs to be electrically connected. It is also a cylindrical structure. The connector 73 is a bolt. The busbar connection assembly 70 also includes a clamping seat 74 with a threaded hole. The semi-circular conductor 72 has a countersunk hole that is adapted to the clamping seat 74. The clamping seat 74 is set in the countersunk hole and is connected to the threaded holes of the upper and lower clamping seats 74 by bolt threads. This fastens the two semi-circular conductors 72 that are connected to each other, thereby tightly and firmly connecting the cylindrical conductor 71 and the busbar 75 to be connected into one body, making the connection more stable and reliable.

[0042] In this embodiment, when the equipment requires electrical connection between two busbars, or when it is necessary to expand multiple environmentally friendly gas-insulated switchgear in parallel, for example, when connecting the expansion busbar 41 to the disconnecting switch 51, the extension busbar 41 in the expansion busbar compartment 40 can be extended as shown in the diagram. Figure 8 and Figure 9 The busbar 75 to be connected is abutted with the axial end of the cylindrical conductor 71, so that the end faces of the two are in contact. Then, two semi-circular conductors 72 are clamped together on the outside of the abutment, so that the through holes of the semi-circular conductors 72 are aligned with the through holes of the cylindrical conductors 71. Finally, the connector 73, such as a bolt, is connected through the through holes to form a stable conductive connection. This connection method can correct the abutment error through the clamping structure of the two semi-circular conductors 72, avoiding the problem of excessively high installation accuracy requirements of traditional rigid connections. At the same time, the contact area of ​​the semi-circular conductors 72 with the cylindrical conductors 71 and the extension busbar 41 is large, and the contact resistance is small, ensuring that it is not easy to heat up when transmitting large currents, further reducing the contact resistance, solving the problems of difficult installation and poor contact reliability of traditional busbar connection methods, providing a guarantee for flexible cabinet expansion of equipment, and facilitating connection and installation, and making it convenient to use.

[0043] Optionally, such as Figure 2 , Figure 10 and Figure 11 As shown, at least one end of the air tank chamber 50 has a square ring plate 54 extending radially from its outer circumference. The square ring plate 54 is connected to the cabinet body, and the lower front part of the air tank chamber 50 is provided with a flat plate 55, which is attached to the cable outlet chamber 30.

[0044] Specifically, the upper and lower ends of the vertically arranged cylindrical shell in the inflation tank chamber 50 both have square ring plates 54 extending radially outward, facilitating connection and fixation with the cabinet and simplifying splicing and cabinet assembly operations. The square ring plates 54 typically have mounting holes for connection and fixation to the cabinet frame using bolts. The flat plate 55 provides a stable support surface for the inflation tank chamber 50 at the lower front of the cabinet, while also optimizing the spatial interface with the cable outlet chamber 30.

[0045] In this embodiment, the square ring plate 54 ensures the reliable installation and fixation of the gas tank chamber 50 to the cabinet, guaranteeing the stability of the core high-pressure components. The structural design of the flat plate 55 allows the cylindrical tank to better adapt to the internal space of the rectangular cabinet, improving space utilization and making the overall structure more compact and stable.

[0046] Optionally, such as Figure 2 , Figure 10 and Figure 11As shown, the upper end of the air tank chamber 50 and the lower end of the extended busbar chamber 40 are connected by an inlet sleeve 42, and the rear end of the flat plate 55 and the cable outlet chamber 30 are connected by an outlet sleeve 32. The inlet sleeve 42 and the outlet sleeve 32 are used to seal the inlet and outlet of the cable, respectively.

[0047] Specifically, both the inlet sleeve 42 and the outlet sleeve 32 can be solidified insulating sleeves, which are formed by casting epoxy resin to cover the central conductive rod and sealing them with a sealing ring that mates with the mounting hole. The outlet sleeve 32 can be either tapered or L-shaped, depending on the actual space requirements.

[0048] In this embodiment, the inlet bushing 42 enables electrical connection and gas chamber isolation between the extended busbar compartment 40 and the gas filling tank compartment 50. The outlet bushing 32 enables connection between the lower conductor 523 of the vacuum circuit breaker 52 in the gas filling tank compartment 50 and the outlet port 31 of the cable outlet compartment 30. By using the inlet bushing 42 and the outlet bushing 32, the reliability of insulation and sealing of the high-voltage conductor when passing through different gas chambers or cabinets is ensured, further improving the overall reliability and stability of the equipment.

[0049] Optionally, such as Figure 2 , Figure 10 and Figure 11 As shown, an observation window 56 is provided at the rear end of the inflation tank chamber 50, and a pressure relief device 57 is provided at the lower end of the inflation tank chamber 50, with the pressure relief device 57 facing the lower rear part of the cabinet.

[0050] Specifically, the axial ends of the horizontally and vertically arranged cylindrical shells of the inflation tank chamber 50 are equipped with sealing plate structures. An observation window 56 is located at the rear sealing plate, and a pressure relief device 57 is located at the lower sealing plate. The observation window 56 can be constructed of a high-strength transparent material (such as polycarbonate) and a sealing structure, used to observe the opening and closing positions of the internal components of the inflation tank chamber 50. The pressure relief device 57 can be a pressure relief valve with a preset pressure value combined with a sealing structure. The pressure relief device 57 automatically activates when the internal pressure exceeds the set safety value, quickly releasing the pressure. Its pressure relief port faces the lower rear of the cabinet, effectively guiding the high-temperature, high-pressure gas to a safe direction.

[0051] In this embodiment, an observation window 56 is provided, offering maintenance personnel a direct view of the operational status of components such as the isolating switch 51, facilitating status confirmation. The pressure relief device 57 is a crucial safety protection component. In extreme situations such as internal arcing faults, it promptly releases pressure, preventing explosive damage to the cabinet and ensuring equipment and personnel safety. Furthermore, the pressure relief device 57 is positioned towards the lower rear of the cabinet, effectively avoiding mechanical operation and control components, preventing damage to other parts and ensuring safer and more reliable operation.

[0052] In addition, another embodiment of the present invention provides a power distribution device, including the environmentally friendly gas-insulated gas-filled switchgear as described above.

[0053] For example, the power distribution equipment is a prefabricated substation.

[0054] In this embodiment, the power distribution equipment provided in this embodiment, by setting the environmentally friendly gas-insulated gas-filled cabinet as described above, has roughly the same technical effect as the environmentally friendly gas-insulated gas-filled cabinet described above, and will not be repeated here.

[0055] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An environmentally friendly gas-insulated gas-filled switchgear, characterized in that, The cabinet includes a control instrument room (10), a mechanism operation room (20), a cable outlet room (30), an expansion busbar room (40), and an air tank room (50) located at the upper front, middle front, lower front, upper rear, and middle rear of the cabinet, respectively. The gas filling tank chamber (50) is a cross-shaped sealed tank structure. Its main body is formed by two cylindrical shells orthogonally connected and integrally formed. The gas filling tank chamber (50) is equipped with a disconnect switch (51), a vacuum circuit breaker (52) and an environmentally friendly insulating gas filled with a pressure higher than atmospheric pressure. The disconnect switch (51) and the vacuum circuit breaker (52) are connected to each other and are arranged in parallel as an integral structure. The control instrument chamber (10), the mechanism operation chamber (20) and the cable outlet chamber (30) form a concave area with the notch facing the rear end. The front end of the four ends of the cross-shaped sealed tank structure is inserted into the concave area and is adjacent to the control instrument chamber (10), the mechanism operation chamber (20) and the cable outlet chamber (30) respectively. The operating room (20) of the mechanism is equipped with an isolating switch operating mechanism (21) and a vacuum circuit breaker operating mechanism (22) that are respectively driven and connected to the isolating switch (51) and the vacuum circuit breaker (52). An extension busbar (41) is provided in the extension busbar compartment (40), and the extension busbar (41) is connected to the disconnecting switch (51); The cable outlet chamber (30) is provided with an outlet port (31), which is connected to the vacuum circuit breaker (52); At least one end of the air tank chamber (50) has a square ring plate (54) extending radially from its outer circumference. The square ring plate (54) is connected to the cabinet body, and the lower front part of the air tank chamber (50) is provided as a flat plate (55), which is attached to the cable outlet chamber (30).

2. The environmentally friendly gas-insulated gas-filled switchgear according to claim 1, characterized in that, The disconnect switch (51) is a direct-acting three-position disconnect switch, which includes a moving contact (511), a connecting contact (512), a grounding contact (513), a moving guide rod (514), and a transmission assembly (515). The disconnect switch operating mechanism (21) is driven to connect with the transmission assembly (515). One end of the moving guide rod (514) is connected to the moving contact (511), and the other end is connected to the transmission assembly (515). The transmission assembly (515) is used to drive the moving guide rod (514) to move linearly. The ends of the moving contact (511), the connecting contact (512), and the grounding contact (513) are all set as arc structures.

3. The environmentally friendly gas-insulated gas-filled switchgear according to claim 2, characterized in that, The disconnector switch operating mechanism (21) includes a drive gear (211) and a transmission shaft (212). The drive gear (211) is driven to drive the transmission shaft (212) to rotate. The transmission shaft (212) passes through the front end of the inflation tank chamber (50) and is connected to the transmission assembly (515). The connection between the transmission shaft (212) and the inflation tank chamber (50) is sealed by a dynamic sealing assembly (53).

4. The environmentally friendly gas-insulated gas-filled switchgear according to claim 3, characterized in that, The vacuum circuit breaker (52) includes a pole made of epoxy resin, a vacuum interrupter (521) is provided inside the pole, and an upper conductor (522) and a lower conductor (523) are led out from the vacuum interrupter (521). The upper conductor (522) is connected to the connecting contact seat (512), and the lower conductor (523) is connected to the outgoing port (31). The protruding part of the pole is provided with an annular skirt structure (524).

5. The environmentally friendly gas-insulated gas-filled switchgear according to claim 1, characterized in that, The environmentally friendly gas-insulated gas-filled cabinet also includes an interlocking mechanism (60), which includes a crank arm (61), a connecting rod assembly (62), and a baffle (63) connected in sequence. The crank arm (61) is located on the vacuum circuit breaker operating mechanism (22) and is connected in transmission to its operating end. The baffle (63) is located on the disconnecting switch operating mechanism (21) and is used to block the action of its operating end.

6. The environmentally friendly gas-insulated gas-filled switchgear according to claim 1, characterized in that, The environmentally friendly gas-insulated gas-filled cabinet also includes a busbar connection assembly (70), which includes a cylindrical conductor (71), a semi-circular conductor (72), and a connector (73). The two ends of the cylindrical conductor (71) and the semi-circular conductor (72) are respectively provided with through holes in the radial direction. The two semi-circular conductors (72) are used to hug each other at the axial docking point of the cylindrical conductor (71) and the busbar (75) to be connected, and the connector (73) is used to connect to the through hole.

7. The environmentally friendly gas-insulated gas-filled switchgear according to claim 1, characterized in that, An inlet sleeve (42) passes through the upper end of the air tank chamber (50) and the lower end of the extended busbar chamber (40), and an outlet sleeve (32) passes through the rear end of the flat plate (55) and the cable outlet chamber (30). The inlet sleeve (42) and the outlet sleeve (32) are used to seal the inlet and outlet respectively.

8. The environmentally friendly gas-insulated gas-filled switchgear according to claim 1, characterized in that, An observation window (56) is provided at the rear end of the inflation tank chamber (50), and a pressure relief device (57) is provided at the lower end of the inflation tank chamber (50), with the pressure relief device (57) facing the lower rear part of the cabinet.

9. A power distribution device, characterized in that, Including the environmentally friendly gas-insulated gas-filled switchgear as described in any one of claims 1-8.

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