Compact high-voltage switch cabinet

Abstract

The invention relates to the technical field of electrical switch cabinets, in particular to a compact high-voltage switch cabinet which is characterized in that the bottom of a bearing frame is integrated with an external box transformer substation bottom frame, and a plurality of sealing plates are detachably arranged on the peripheral side faces and the top of the bearing frame; the vacuum circuit breaker unit is arranged in a front side area in the bearing frame, the primary element unit is arranged in a rear side area in the bearing frame, the instrument chamber unit is arranged in a side edge area in the bearing frame, and the voltage transformer unit is arranged in a bottom area. The front side area, the rear side area, the side edge area and the bottom area of the bearing frame structure are functionally partitioned, all units are independently arranged, the internal space utilization rate is remarkably increased, and mutual interference among elements is reduced. And the sealing plate adopts a detachable and split structure, so that the maintenance is more convenient, and the safety is higher. The bearing frame is integrated with the box-type transformer substation bottom frame, so that the overall structure is more compact, the occupied area is smaller, and the box-type transformer substation is suitable for various compact power distribution scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical switch cabinet, in particular to a compact high-voltage switch cabinet. BACKGROUND

[0002] The high-voltage switch cabinet is a key equipment in the power distribution system, which is widely used in the substation, box-type substation and ring network power supply system of industrial, commercial and power system to complete the control, protection and distribution of electric energy. With the development of urban power distribution network towards compactness and intelligence, higher requirements are put forward for the volume, integration, safety and maintenance convenience of the switch cabinet.

[0003] The existing compact high-voltage switch cabinet usually adopts a plate type shell structure, and the vacuum circuit breaker, disconnecting switch, current transformer, voltage transformer and secondary instrument elements are dispersedly arranged inside the cabinet. Many switch cabinets need to be provided with independent bottom plates, and the overall height is large, and the combination degree with the box-type substation bottom frame is not high, which is difficult to meet the demand for small-sized and high-integration equipment in chemical industry park, urban power distribution room and the like. There is no clear regional division between the vacuum circuit breaker, primary element, instrument room and voltage transformer unit, which leads to complex cable wiring and large risk of space interference between primary element and secondary element, which is not conducive to operation safety and heat dissipation. SUMMARY

[0004] (I) Invention purpose The purpose of the present application is to provide a compact high-voltage switch cabinet, which is characterized by the following technical solutions. The function of the bearing frame structure is divided into front side, rear side, side edge and bottom area, so that the vacuum circuit breaker, primary element, instrument room and voltage transformer unit are arranged independently, which significantly improves the utilization rate of internal space and reduces the mutual interference between elements. The sealing plate adopts a detachable and split type structure, which is more convenient and safer for maintenance. The bearing frame is integrated with the box-type substation bottom frame, so that the overall structure is more compact and occupies less land, which is suitable for various compact power distribution scenes.

[0005] (II) Technical solutions In order to solve the above problems, the present application provides a compact high-voltage switch cabinet, comprising: a bearing frame, a plurality of sealing plates, a vacuum circuit breaker unit, a primary element unit, an instrument room unit and a voltage transformer unit; The bottom of the bearing frame is integrated with the external box-type substation bottom frame, and the plurality of sealing plates are detachably arranged on the four side surfaces and the top of the bearing frame; The bearing frame comprises a front side area, a rear side area, a side edge area and a bottom area, The front area is the space area of ​​the supporting frame facing the operating side, the rear area is the space area of ​​the supporting frame facing away from the operating side, the side area is the lateral area of ​​the supporting frame along the left and right direction, and the bottom area is the space area between the lower edge of the supporting frame and the bottom frame of the external transformer. The vacuum circuit breaker unit is located in the front area of ​​the support frame, the primary element unit is located in the rear area of ​​the support frame, the instrument compartment unit is located in the side area of ​​the support frame, and the voltage transformer unit is located in the bottom area.

[0006] In another aspect of the present invention, preferably, the sealing plate includes a front sealing plate, the front sealing plate being disposed on the front side of the support frame; The front sealing plate includes a front upper sealing plate and a front lower sealing plate; The upper front sealing plate and the lower front sealing plate are connected by an interlocking or snap-fit ​​structure. The upper front sealing plate is structurally limited by the lower front sealing plate. The upper front sealing plate can be removed after the lower front sealing plate is disassembled.

[0007] In another aspect of the present invention, preferably, the vacuum circuit breaker unit includes a vacuum circuit breaker and an operating mechanism; the operating mechanism is connected to the vacuum circuit breaker. The front sealing plate is provided with an observation window, a status indicator and an operating door. The observation window is used to display the operating status of the vacuum circuit breaker, the status indicator is used to display the opening and closing status of the vacuum circuit breaker, and the opening and closing operations of the vacuum circuit breaker are performed through the operating door.

[0008] In another aspect of the present invention, preferably, the front region includes an upper sill, a lower sill, and an operating mounting plate, the upper sill and the lower sill are connected to the load-bearing frame, the vacuum circuit breaker is connected to the load-bearing frame through the upper sill and the lower sill, the operating mounting plate is connected to the load-bearing frame, and the operating mechanism is connected to the load-bearing frame through the operating mounting plate.

[0009] In another aspect of the present invention, preferably, the sealing plate includes a rear sealing plate, the rear sealing plate being disposed on the rear side of the support frame; The rear sealing plate includes an upper rear sealing plate and a lower rear sealing plate. The upper rear sealing plate is structurally limited by the lower rear sealing plate. The upper rear sealing plate can be removed after the lower rear sealing plate is removed.

[0010] In another aspect of the present invention, preferably, the primary component unit includes a disconnecting switch, a grounding switch, a current transformer, and a surge arrester; The rear area includes a first mounting beam, a second mounting beam, and a third mounting beam; the first mounting beam, the second mounting beam, and the third mounting beam are arranged sequentially from top to bottom at different height positions on the rear side of the load-bearing frame; The current transformer is connected to the load-bearing frame via a first mounting beam, the disconnecting switch and the grounding switch are connected to the load-bearing frame via a second mounting beam, and the surge arrester is connected to the load-bearing frame via a third mounting beam.

[0011] In another aspect of the present invention, preferably, the sealing plate includes a side sealing plate, the side sealing plate being disposed on the side of the supporting frame; The side sealing plate includes an upper side sealing plate and a lower side sealing plate; The upper side sealing plate and the lower side sealing plate are connected by an interlocking or snap-fit ​​structure. The upper side sealing plate is structurally limited by the lower side sealing plate. The upper side sealing plate can be removed after the lower side sealing plate is disassembled.

[0012] In another aspect of the present invention, preferably, the instrument room unit includes an instrument room, a counter, an electromagnetic lock, and a lighting fixture; The counter is located above the instrument room, and the electromagnetic lock and lighting are located below the instrument room. The side upper sealing plate is provided with an instrument door, and the instrument compartment is located at the position corresponding to the instrument door; The electromagnetic lock and the lighting lamp are located at the corresponding positions on the lower side panel.

[0013] In another aspect of the present invention, preferably, the voltage transformer unit is disposed on the base plate of the outer transformer substation frame.

[0014] In another aspect, preferably, the invention further includes a busbar unit and a cable unit; the busbar unit is disposed at the uppermost part of the rear region; and the cable unit is disposed in the bottom region.

[0015] (III) Beneficial Effects The above-described technical solution of the present invention has the following beneficial technical effects: This invention employs a detachable sealing plate structure, with each section designed as a separate upper and lower unit. The assembly and disassembly sequence is clear, facilitating localized maintenance, reducing unnecessary disassembly operations, and significantly improving maintenance efficiency and operational safety. The bottom of the load-bearing frame is integrated with the transformer substation's bottom frame, eliminating the need for a separate base plate in traditional switchgear. This results in a more compact cabinet and a further reduction in overall structural height, making it suitable for confined spaces and height-restricted environments such as transformer substations. By functionally dividing the load-bearing frame into front, rear, side, and bottom areas, an optimized layout of the switchgear's internal structure is achieved. The vacuum circuit breaker unit is located in the front operating area, facilitating operation and maintenance; the primary component unit is arranged in the rear area, allowing for centralized placement of high-voltage conductive components and reducing mutual interference; the instrument compartment unit is located in the side area, effectively isolating secondary control from the primary high-voltage unit; and the voltage transformer unit is located in the bottom area, improving overall safety and heat dissipation performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a side view of the overall structure of an embodiment of the present invention; Figure 3 This is another side view of the overall structure of one embodiment of the present invention; Figure label: 1: Load-bearing frame; 2: Vacuum circuit breaker unit; 2-1: Vacuum circuit breaker; 2-2: Operating mechanism; 3: Primary component unit; 3-1: Disconnecting switch; 3-2: Grounding switch; 3-3: Current transformer; 3-4: Surge arrester; 4: Instrument room unit; 4-1: Instrument room; 4-2: Counter; 4-3: Electromagnetic lock; 4-4: Lighting lamp; 5: Voltage transformer unit; 6: Busbar unit; 7: Cable unit. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0018] The accompanying drawings show structural schematic diagrams according to embodiments of the present invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0019] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] The invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0023] Example 1 A compact high-voltage switchgear, Figure 1 A schematic diagram of the overall structure of one embodiment of the present invention is shown. Figure 2 A side view of the overall structure of an embodiment of the present invention is shown. Figure 3 Another side view of the overall structure of an embodiment of the present invention is shown, as follows. Figure 1 , Figure 2 and Figure 3 As shown, it includes: a load-bearing frame 1, several sealing plates, a vacuum circuit breaker unit 2, a primary element unit 3, an instrument room unit 4, and a voltage transformer unit 5; The bottom of the load-bearing frame 1 is integrated with the outer transformer substation bottom frame. The load-bearing frame 1 is a spatial skeleton structure with metal welding or bolt connection. Its bottom is integrated with the outer transformer substation bottom frame, achieving the load-bearing capacity and stability of the overall structure without the need for a separate base plate, thereby effectively reducing the cabinet height. Several sealing plates are detachably installed on the four sides and top of the load-bearing frame 1. The sealing plates detachably cover the four sides and top of the load-bearing frame 1 to form the outer shell of the cabinet. The sealing plates can be designed in a split manner, including upper and lower segmented structures, to facilitate partial disassembly and maintenance.

[0024] The supporting frame 1 includes a front region, a rear region, side regions, and a bottom region. The front area, facing the operator, is used to house the vacuum circuit breaker unit 2 and related operating mechanisms, ensuring that the operator can observe and operate the circuit breaker's open / closed status through the observation window and operating door on the front panel. The rear area, facing away from the operator, is used to house the primary component unit 3, including high-voltage primary components such as disconnect switches, grounding switches, current transformers, and surge arresters, to ensure centralized arrangement of the primary circuit and reduce interference between components. The side area extends left and right, used to house the instrument room unit 4 and secondary control components. The instrument room can be equipped with voltmeters, relay protection modules, and counters, and is equipped with lighting devices and electromagnetic locks to prevent misoperation and ensure operational safety. The bottom area, located between the lower edge of the load-bearing frame and the bottom frame of the transformer substation, is used to install the voltage transformer unit 5 and related wiring, while also providing stable support for the cabinet.

[0025] The vacuum circuit breaker unit 2 is located in the front area of ​​the supporting frame 1, the primary component unit 3 is located in the rear area of ​​the supporting frame 1, the instrument compartment unit 4 is located in the side area of ​​the supporting frame 1, and the voltage transformer unit 5 is located in the bottom area. Through this functional area division, the vacuum circuit breaker unit 2, primary component unit 3, instrument compartment unit 4, and voltage transformer unit 5 are independently arranged within the supporting frame 1, achieving high space utilization and isolation between units, reducing electrical interference and safety risks. The sealing plate adopts a detachable, split-type design, allowing maintenance personnel to open only the corresponding area for operation or maintenance without disassembling the entire sealing plate, improving maintenance efficiency and safety. Furthermore, the integrated design of the supporting frame 1 and the transformer base frame enhances overall load-bearing capacity and stability, while also making the cabinet structure compact and adaptable to various installation environments, including ring main units, prefabricated substations, and other power distribution locations.

[0026] Furthermore, in this embodiment, the sealing plate includes a front sealing plate, which is disposed on the front side of the supporting frame 1; the front sealing plate is used to cover the front area and protect the internal vacuum circuit breaker unit 2 and related operating mechanisms, while providing an interface for operation and observation.

[0027] The front sealing plate includes a front upper sealing plate and a front lower sealing plate; The upper front sealing plate and the lower front sealing plate are connected by an interlocking or snap-fit ​​structure. The upper front sealing plate is structurally limited by the lower front sealing plate. The upper front sealing plate can be removed after the lower front sealing plate is disassembled. This split design allows the lower front sealing plate to be disassembled first, followed by the upper front sealing plate, facilitating local maintenance and operation while avoiding accidental damage to other components during disassembly, thus improving operational safety. The front sealing plate is equipped with an observation window, a status indicator, and an operating door. The observation window is used to directly observe the operating status of the vacuum circuit breaker 2-1, the status indicator displays the opening and closing status of the vacuum circuit breaker, and the operating door allows direct opening and closing operations of the vacuum circuit breaker 2-1 via the operating mechanism 2-2, ensuring intuitive, convenient, and safe operation.

[0028] The vacuum circuit breaker unit 2 includes a vacuum circuit breaker 2-1 and an operating mechanism 2-2; the operating mechanism 2-2 is connected to the vacuum circuit breaker 2-1. The front sealing plate is provided with an observation window, a status indicator and an operating door. The observation window is used to display the operating status of the vacuum circuit breaker, the status indicator is used to display the opening and closing status of the vacuum circuit breaker, and the opening and closing operations of the vacuum circuit breaker 2-1 are performed through the operating door.

[0029] The front area is equipped with an upper and lower sill, and an operating mounting plate. The upper and lower sills are connected to the support frame 1 and serve as the fixing and support base for the vacuum circuit breaker 2-1, ensuring the circuit breaker is stably installed in the front area while providing the necessary installation height and operating space. The operating mounting plate is fixedly connected to the support frame 1, and the operating mechanism 2-2 is connected to the support frame 1 through the operating mounting plate, realizing mechanical force transmission and stable support between the mechanism and the frame, ensuring that the circuit breaker does not shake or loosen during operation. This embodiment's design, through the separate disassembly of the lower and upper front sealing plates, the stable connection between the circuit breaker and the sill and operating mounting plate, and the arrangement of the observation window and status indicator on the front sealing plate, enables the front area to achieve safe operation and monitoring of the circuit breaker, facilitate maintenance and repair, avoid the exposure of high-voltage components, ensure personnel safety, and improve the overall safety and reliability of the cabinet.

[0030] Furthermore, in this embodiment, the sealing plate includes a rear sealing plate, which is disposed on the rear side of the supporting frame 1; it is used to cover the rear area and provide protection for the primary component unit 3 and related high-voltage conductive components.

[0031] The rear side sealing plate includes an upper rear sealing plate and a lower rear sealing plate. The upper rear sealing plate is structurally limited by the lower rear sealing plate. After the lower rear sealing plate is disassembled, the upper rear sealing plate can be removed. The two are arranged in a split structure. The upper rear sealing plate is structurally limited by the lower rear sealing plate, which ensures that the upper rear sealing plate is stably positioned under normal conditions. When disassembly is required, the lower rear sealing plate is removed first, and then the upper rear sealing plate can be removed. This allows for partial maintenance without disassembling the entire rear side sealing plate, thereby improving maintenance convenience and operational safety, while reducing interference with other functional units.

[0032] The primary component unit 3 includes a disconnecting switch 3-1, a grounding switch 3-2, a current transformer 3-3, and a surge arrester 3-4. The rear area includes a first mounting beam, a second mounting beam, and a third mounting beam. The first, second, and third mounting beams are arranged sequentially from top to bottom at different heights on the rear side of the supporting frame 1. The disconnecting switch 3-1, grounding switch 3-2, current transformer 3-3, and surge arrester 3-4 realize the on / off control, fault isolation, and overvoltage protection of the power distribution system. The disconnecting switch 3-1 and grounding switch 3-2 can be an integrated structure. The first, second, and third mounting beams are arranged inside the rear area according to functional and height requirements, and are installed sequentially from top to bottom on the rear side of the supporting frame 1. Each mounting beam serves as a support and fixing base for the primary component, ensuring that the component is stably installed and forms a reliable mechanical connection with the frame, ensuring that it will not loosen or shift during operation.

[0033] The current transformer 3-3 is fixedly connected to the supporting frame 1 via the first mounting beam, and is positioned at the upper part of the rear area for easy current sampling and wire connection. The disconnecting switch 3-1 and the grounding switch 3-2 are connected to the supporting frame 1 via the second mounting beam and are arranged at a mid-height position for easy operation and circuit isolation. The surge arrester 3-4 is connected to the supporting frame 1 via the third mounting beam and is located at the lower part, enabling effective grounding and overvoltage absorption to ensure safety. The primary components in the rear area are arranged in layers according to function and height, ensuring both operational safety and accessibility, while also achieving reasonable isolation between high-voltage components and maximizing space utilization. Simultaneously, the split design of the rear sealing plate, combined with the mounting beam support structure, makes maintenance and repair more convenient and reliable, and improves the mechanical stability and operational safety of the entire switchgear.

[0034] Furthermore, in this embodiment, the sealing plate includes a side sealing plate, which is disposed on the side of the supporting frame 1; it is used to enclose the lateral spaces on the left and right sides of the supporting frame 1. The side sealing plate may include a left side sealing plate and a right side sealing plate.

[0035] The side sealing plate includes an upper side sealing plate and a lower side sealing plate. The upper and lower side sealing plates are connected by an interlocking or snap-fit ​​structure. The upper side sealing plate is structurally limited by the lower side sealing plate. The upper side sealing plate can be removed after the lower side sealing plate is disassembled. After assembly, the upper side sealing plate is limited by the lower side sealing plate, preventing it from shifting or falling off under external force or vibration. When maintaining or inspecting the instrument room, the lower side sealing plate can be removed first to release the limitation on the upper side sealing plate, and then the upper side sealing plate can be removed, achieving convenient step-by-step disassembly and assembly, improving maintenance efficiency and operational safety.

[0036] In this embodiment, the instrument compartment unit 4 is located in the left side area. The left side sealing plate is used to enclose and protect the left side area where the instrument compartment unit 4 is located, and the right side sealing plate is used to enclose the right side space area of ​​the supporting frame 1, so that the entire switch cabinet forms a sealed and safe external structure, ensuring the dustproof, moisture-proof and mechanical protection performance of the internal components during operation.

[0037] The instrument room unit 4 includes an instrument room 4-1, a counter 4-2, an electromagnetic lock 4-3, and a lighting lamp 4-4; The counter 4-2 is located above the instrument room 4-1, and the electromagnetic lock 4-3 and the lighting lamp 4-4 are located below the instrument room 4-1. The instrument room 4-1 is a container structure forming an independent and enclosed space, used to install and protect the cabinet operating parameter recorder, auxiliary controller and its supporting cable terminals and other equipment. In this embodiment, the instrument room 4-1 centrally installs secondary equipment such as microcomputers, measuring instruments, live displays and terminal blocks. The counter 4-2 is located in the area above the instrument room 4-1, which is convenient to view through the instrument door, and is used to record the number of operations or mechanical actions of the vacuum circuit breaker, so that maintenance personnel can assess the equipment status and service life.

[0038] The side panel is equipped with an instrument door, and the instrument compartment 4-1 is located at the corresponding position of the instrument door. The instrument compartment 4-1 is arranged directly behind the instrument door, so that after opening the instrument door, one can directly observe, replace parts, or perform setting operations.

[0039] The electromagnetic lock 4-3 and the lighting lamp 4-4 are located at corresponding positions on the lower side panel. The electromagnetic lock 4-3 controls the locking and unlocking of the instrument door to prevent unauthorized personnel from opening it, ensuring the safety of the switch cabinet operation. The lighting lamp 4-4 provides illumination for the instrument room, facilitating equipment inspection, record reading, and maintenance operations under low-light conditions.

[0040] Furthermore, in this embodiment, the voltage transformer unit 5 is disposed on the bottom plate of the outer transformer substation frame.

[0041] Furthermore, this embodiment also includes a busbar unit 6 and a cable unit 7; The busbar unit 6 is located at the top of the rear area; the busbar unit 6 is used to fix the main busbar system and adopts a top-outlet method for easy connection of the transformer. At the same time, the pressure relief channel is located at the top to prevent accidental injury to operators due to electrical faults.

[0042] The cable unit 7 is located in the bottom area. It provides ample space for cable connections, and its design fully considers the installation and maintenance needs of the cables, ensuring sufficient bending radius to prevent stress damage. Cable entry and exit directions can accommodate either bottom entry / exit or front exit from the ring main unit to meet different usage environments.

[0043] This invention employs a detachable sealing plate structure, with each section designed as a separate upper and lower unit. The assembly and disassembly sequence is clear, facilitating localized maintenance, reducing unnecessary disassembly operations, and significantly improving maintenance efficiency and operational safety. The bottom of the load-bearing frame is integrated with the transformer substation's bottom frame, eliminating the need for a separate base plate in traditional switchgear. This results in a more compact cabinet and a further reduction in overall structural height, making it suitable for confined spaces and height-restricted environments such as transformer substations. By functionally dividing the load-bearing frame into front, rear, side, and bottom areas, an optimized layout of the switchgear's internal structure is achieved. The vacuum circuit breaker unit is located in the front operating area, facilitating operation and maintenance; the primary component unit is arranged in the rear area, allowing for centralized placement of high-voltage conductive components and reducing mutual interference; the instrument compartment unit is located in the side area, effectively isolating secondary control from the primary high-voltage unit; and the voltage transformer unit is located in the bottom area, improving overall safety and heat dissipation performance.

[0044] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

[0045] The above description does not provide detailed explanations of the technical aspects of each layer's patterning and etching. However, those skilled in the art should understand that various methods existing in the prior art can be used to form layers and regions of the desired shape. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above.

[0046] The present invention has been described above with reference to embodiments thereof. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

[0047] Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and modifications can be made to the embodiments of the present invention without departing from the spirit and scope of the invention.

[0048] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A compact high voltage switchgear, characterized in that The utility model relates to a kind of box-type transformer substation, including: Bearing frame (1), several sealing plates, vacuum circuit breaker unit (2), primary component unit (3), instrument room unit (4) and voltage transformer unit (5); The bottom of the bearing frame (1) is integrated with the external box transformer bottom frame, and the several sealing plates are detachably arranged on the four peripheral sides and the top of the bearing frame (1); The bearing frame (1) includes a front side area, a back side area, a side edge area and a bottom area, The front side area is the space area of the bearing frame (1) facing the operation side, the back side area is the space area of the bearing frame (1) away from the operation side, the side edge area is the lateral area of the bearing frame (1) along the left and right directions, and the bottom area is the space area between the lower edge of the bearing frame (1) and the external box transformer bottom frame. The vacuum circuit breaker unit (2) is arranged in the front side area of the bearing frame (1), the primary component unit (3) is arranged in the back side area of the bearing frame (1), the instrument room unit (4) is arranged in the side edge area of the bearing frame (1), and the voltage transformer unit (5) is arranged in the bottom area.

2. The compact high voltage switchgear according to claim 1, characterized in that The sealing plate includes a front side sealing plate, which is arranged on the front side of the bearing frame (1); The front side sealing plate includes a front upper sealing plate and a front lower sealing plate; The front upper sealing plate and the front lower sealing plate are connected by a structure of mutual engagement or buckling, the front upper sealing plate is limited in structure by the front lower sealing plate, and the front upper sealing plate can be detached after the front lower sealing plate is detached.

3. The compact high voltage switchgear according to claim 2, characterized in that The vacuum circuit breaker unit (2) includes a vacuum circuit breaker (2-1) and an operating mechanism (2-2); the operating mechanism (2-2) is connected with the vacuum circuit breaker (2-1); An observation window, a state indicator and an operating door are arranged on the front side sealing plate, the observation window is used for the running state of the vacuum circuit breaker, the state indicator is used for displaying the opening and closing state of the vacuum circuit breaker, and the vacuum circuit breaker (2-1) is operated through the operating door.

4. Compact high voltage switchgear according to claim 3, characterized in that The front side area includes an upper threshold, a lower threshold and an operating mounting plate, the upper threshold and the lower threshold are connected with the bearing frame (1), the vacuum circuit breaker (2-1) is connected with the bearing frame (1) through the upper threshold and the lower threshold, the operating mounting plate is connected with the bearing frame (1), and the operating mechanism (2-2) is connected with the bearing frame (1) through the operating mounting plate.

5. The compact high voltage switchgear according to claim 1, characterized in that, The sealing plate includes a back side sealing plate, which is arranged on the back side of the bearing frame (1); The back side sealing plate includes a back upper sealing plate and a back lower sealing plate, the back upper sealing plate is limited in structure by the back lower sealing plate, and the back upper sealing plate can be detached after the back lower sealing plate is detached.

6. Compact high voltage switchgear according to claim 5, characterized in that The primary component unit (3) includes a disconnector (3-1), an earthing switch (3-2), a current transformer (3-3) and a lightning arrester (3-4); The back side area includes a first mounting beam, a second mounting beam and a third mounting beam; the first mounting beam, the second mounting beam and the third mounting beam are sequentially arranged at different height positions on the back side of the bearing frame (1) from top to bottom; The current transformer (3-3) is connected with the bearing frame (1) through a first mounting beam, the disconnector (3-1) and the grounding switch (3-2) are connected with the bearing frame (1) through a second mounting beam, and the lightning arrester (3-4) is connected with the bearing frame (1) through a third mounting beam.

7. The compact high voltage switchgear according to claim 1, characterized in that The sealing plate comprises side edge sealing plates arranged at the side edges of the bearing frame (1). The side edge sealing plates comprise upper side edge sealing plates and lower side edge sealing plates. The upper side edge sealing plates and the lower side edge sealing plates are connected in a structure of mutual engagement or buckling, the upper side edge sealing plates are limited in structure by the lower side edge sealing plates, and the upper side edge sealing plates can be disassembled after the lower side edge sealing plates are disassembled.

8. Compact high voltage switchgear according to claim 7, characterized in that The instrument room unit (4) comprises an instrument room (4-1), a counter (4-2), an electromagnetic lock (4-3) and a lighting lamp (4-4). The counter (4-2) is arranged above the instrument room (4-1), and the electromagnetic lock (4-3) and the lighting lamp (4-4) are arranged below the instrument room (4-1). The upper side edge sealing plates are provided with instrument doors, and the instrument room (4-1) is arranged at a position corresponding to the instrument doors. The electromagnetic lock (4-3) and the lighting lamp (4-4) are arranged at positions corresponding to the lower side edge sealing plates.

9. The compact high voltage switchgear according to claim 1, characterized in that The voltage transformer unit (5) is arranged on a bottom plate of a bottom frame of an external box transformer.

10. The compact high voltage switchgear according to claim 1, characterized in that Further comprising a busbar unit (6) and a cable unit (7). The busbar unit (6) is arranged at the uppermost position of the rear side area. The cable unit (7) is arranged at the bottom area.

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