A double-busbar C-GIS metal-enclosed switchgear

Abstract

The present invention relates to the field of power distribution equipment, and in particular to a double-busbar C-GIS metal-enclosed switchgear, comprising a switch cabinet body, a pressure relief duct chamber arranged therein, and a plurality of independent chambers that can be connected to and disconnected from the pressure relief duct chamber. The chamber body comprises an instrument control chamber, a section I busbar chamber, a section II busbar chamber, a circuit breaker chamber, and a cable chamber. The section I busbar chamber is arranged above the circuit breaker chamber and behind the instrument control chamber, and the section II busbar chamber is arranged above the circuit breaker chamber and behind the section I busbar chamber. The circuit breaker chamber is provided with a circuit breaker, an inner cone bushing, and a lower bushing; the upper end of the inner cone bushing is connected to the circuit breaker through a busbar, and one end of the lower bushing is connected to the circuit breaker through the busbar; the cable chamber is provided with a current transformer and a voltage transformer; the lower end of the inner cone bushing is connected to the incoming and outgoing cables through an inner cone cable plug; the other end of the lower bushing is connected to the voltage transformer through a cable plug and a high-voltage cable. The cabinet of the present invention is modular and can be freely assembled, saving space.

Description

Technical Field

[0001] The present invention relates to the field of electric power distribution equipment, and in particular to a double-busbar C-GIS metal-enclosed switchgear. Background Art

[0002] With the continuous development of society and the increasing complexity of engineering construction, users are demanding increasingly higher requirements for switchgear with reduced footprint, miniaturization, maintenance-free operation, and intelligent operation. In the medium-voltage sector, especially at the 35kV level, conventional air-insulated switchgear is generally large, heavy, and difficult to operate, failing to meet the requirements of harsh environments such as high altitudes, humidity, and dirt. In particular, when a busbar experiences an extreme fault, such as a short circuit or burnout caused by high temperature or high-intensity electrodynamic effects, busbar repair is necessary. The traditional approach is to shut down power before repairing the busbar and then resume operation after the repair is complete. However, this operation often causes all power supply and distribution equipment along the entire busbar to cease operation, resulting in significant losses. Against this backdrop, a double-busbar C-GIS metal-enclosed switchgear is gaining increasing attention. It uses SF6 gas as the switchgear's insulating medium and vacuum or SF6 as the arc extinguishing medium. Medium-voltage components, such as the busbar, circuit breaker, and three-position isolating and grounding switch, are centrally enclosed within a sealed enclosure. It has the advantages of saving equipment, installation space, light weight, good safety, high reliability, and adaptability to use in harsh environmental conditions. Summary of the Invention

[0003] In order to solve the problem in the prior art that switch cabinets using air as the insulating medium are generally large in size, the present invention provides a double-busbar C-GIS metal-enclosed switchgear that saves equipment and installation space.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A double-busbar C-GIS metal-enclosed switchgear includes a switch cabinet body, wherein the switch cabinet body is provided with a pressure relief channel chamber and a plurality of independent chamber bodies that can be connected to and disconnected from the pressure relief channel chamber. The chamber bodies include:

[0006] Instrument control room, wherein the instrument control room is equipped with a three-position operating mechanism for bus section I, a three-position operating mechanism for bus section II, a circuit breaker mechanism, a circuit breaker mechanical interlock, and a three-position operating mechanism interlock;

[0007] Section I busbar room, which is located above the circuit breaker room and behind the instrument control room, is provided with a first side splicing bushing, which is connected to the busbar connector for expanding the cabinet;

[0008] The busbar section II chamber is arranged above the circuit breaker chamber and behind the busbar section I chamber, and is provided with a second side splicing bushing, which is connected to the busbar connector for expanding the cabinet;

[0009] A circuit breaker chamber, wherein the circuit breaker chamber is provided with a circuit breaker switch, an inner cone bushing and a lower bushing; the upper end of the inner cone bushing is connected to the circuit breaker switch through a busbar, and one end of the lower bushing is connected to the circuit breaker switch through the busbar;

[0010] The cable room is equipped with a current transformer, a voltage transformer, and a high-voltage cable. The lower end of the inner cone bushing is connected to the incoming and outgoing cables through an inner cone cable plug; the other end of the lower bushing is connected to the voltage transformer through a cable plug and a high-voltage cable, which is used to measure and collect the bus voltage.

[0011] Furthermore, the busbar section I chamber and the circuit breaker chamber are connected by a first intermediate bushing, and the busbar section II chamber and the circuit breaker chamber are connected by a second intermediate bushing. The lower ends of the first intermediate bushing and the second intermediate bushing are respectively connected to the circuit breaker switch through the busbar, and the upper ends of the first intermediate bushing and the second intermediate bushing are respectively provided with a three-position switch for the busbar section I and a three-position switch for the busbar section II.

[0012] Furthermore, the three-station operating mechanism of bus section I is connected to the bus section chamber I through a first magnetic fluid seal, and the three-station operating mechanism of bus section I drives the first magnetic fluid seal, and the first magnetic fluid seal is arranged on the front side of the bus section I chamber. The three-station operating mechanism of bus section II is connected to the bus section chamber II through a transmission rod and a second magnetic fluid seal, and the three-station operating mechanism of bus section II drives the transmission rod, and the transmission rod is transmission-connected to the second magnetic fluid seal.

[0013] Furthermore, the three-position switch of busbar section I and the three-position switch of busbar section II are respectively fixed above the first intermediate sleeve and the second intermediate sleeve, and moving contacts are slidingly provided in the three-position switch of busbar section I and the three-position switch of busbar section II. Insulating rods are respectively connected to the first magnetic fluid seal and the second magnetic fluid seal by means of a screw rod, and the insulating rods are transmission-connected to the moving contacts at corresponding positions, thereby driving the moving contacts at corresponding positions to move.

[0014] Furthermore, the instrument control room is also provided with a small busbar duct, a secondary line duct, a busbar section I chamber pressure gauge, a busbar section II chamber pressure gauge and a circuit breaker chamber pressure gauge. The busbar section I chamber pressure gauge is used to detect the air pressure in the busbar section I chamber, the busbar section II chamber pressure gauge is used to detect the air pressure in the busbar section II chamber, and the circuit breaker chamber pressure gauge is used to detect the air pressure in the circuit breaker chamber.

[0015] Furthermore, the instrument control room is also equipped with integrated protectors, secondary components, instruments, opening and closing control and indicating devices.

[0016] Furthermore, the pressure relief channel chamber is located at the rear of the circuit breaker chamber and above the busbar chambers of section I and II, with pressure relief directed from the top. This system offers excellent explosion-proof performance and can withstand high-energy impacts. The structure must be both reliable and meet mechanical strength requirements.

[0017] Furthermore, a first pressure relief plate and a second pressure relief plate are provided at the upper end of the pressure relief channel chamber.

[0018] Furthermore, a first pressure relief valve is installed on the upper wall of the section I busbar chamber, a second pressure relief valve is installed on the upper wall of the section II busbar chamber, and a third pressure relief valve is provided on the side wall of the circuit breaker chamber.

[0019] Furthermore, a first hoisting positioning block is provided on the top of the busbar chamber section I for equipment hoisting and cabinet positioning, and a second hoisting positioning block is provided on the top of the busbar chamber section II for equipment hoisting and cabinet positioning, thereby improving construction efficiency.

[0020] Beneficial effects:

[0021] (1) The cabinet structure of the present invention is modular and can be freely assembled: the busbar compartment of section I and the busbar compartment of section II are combined into one device, which saves equipment; the modular structure is simplified and the combination is flexible; the core switch units are sealed in a metal gas chamber, and the structural design of gas insulation medium and interface insulation is adopted. The reduction in the size of the switch cabinet can save installation space, which is very suitable for and meets the requirements of miniaturization;

[0022] (2) The primary circuit is connected by a high-voltage cable, an inner-cone cable plug through a current transformer and the inner-cone sleeve of the circuit breaker chamber, and then connected in parallel through the circuit breaker to the three-position switch of bus section I and the three-position switch of bus section II to form a primary circuit. Under normal circumstances, only one bus is in operation and the other bus is used as a backup. If an extreme fault occurs in the normal operation of bus section I, the faulty bus can be taken out of operation by switching between the three-position switch of bus section I and the circuit breaker, and the normal bus section II can be put into operation to continue to ensure the power supply and distribution relationship of the primary circuit. At this time, the maintenance personnel only need to repair bus section I, and the operation cycle effect can be maintained to provide uninterrupted power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a front view of the internal structure of the switchgear of the present invention;

[0026] Figure 3 This is a cross-sectional view of the internal structure of the switchgear of the present invention;

[0027] Figure 4 This is a back view of the internal structure of the switchgear of the present invention.

[0028] 1. Switchgear body; 2. Instrument control room; 201. Small busbar trunking; 202. Three-position operating mechanism for busbar section I; 203. Interlocking mechanism for the three-position operating mechanism; 204. Circuit breaker mechanism; 205. Secondary trunking; 206. Pressure gauge for busbar section I; 207. Pressure gauge for busbar section II; 208. Three-position operating mechanism for busbar section II; 209. Pressure gauge for circuit breaker compartment; 3. Busbar section I compartment; 301. First intermediate bushing; 302. First magnetic fluid seal; 303. Three-position switch for busbar section I; 304. First side bushing; 305. First hoisting positioning block; 306. First pressure relief valve; 4. Pressure relief channel compartment; 401. First pressure relief plate; 402. Second pressure relief plate; 5. Section II busbar chamber; 501. Second pressure relief valve; 502. Second lifting positioning block; 503. Second side bushing; 504. Section II busbar three-position switch; 505. Second magnetic fluid seal; 506. Second intermediate bushing; 507. Transmission rod; 6. Circuit breaker chamber; 601. Third pressure relief valve; 602 Circuit breaker switch; 603. Lower bushing; 604. Inner cone bushing; 7. Cable chamber; 701. Cable plug; 702. High-voltage cable; 703. Voltage transformer; 704. Incoming and outgoing cables; 705. Current transformer; 706. Inner cone cable plug. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] like Figures 1 to 4 A double-busbar C-GIS metal-enclosed switchgear includes a switchgear body 1, which is provided with a pressure relief passage chamber 4 and a plurality of independent chambers that can be connected to the pressure relief passage chamber 4 in a switchable manner. The chambers include an instrument control chamber 2, a section I busbar chamber 3, a section II busbar chamber 5, a circuit breaker chamber 6, and a cable chamber 7.

[0036] The instrument control room 2 is equipped with a three-position operating mechanism 202 for bus section I, a three-position operating mechanism 208 for bus section II, a circuit breaker mechanism 204, a circuit breaker mechanical interlock, and a three-position operating mechanism interlock 203;

[0037] The busbar compartment 3 of section I is arranged above the circuit breaker compartment 6 and behind the instrument control compartment 2. A first side splicing bushing 304 is provided inside the compartment. The first side splicing bushing 304 is connected to the busbar connector for expanding the cabinet.

[0038] The busbar compartment 5 of section II is arranged above the circuit breaker compartment 6 and behind the busbar compartment 3 of section I. A second side splicing bushing 503 is provided inside the compartment. The second side splicing bushing 503 is connected to the busbar connector for expanding the cabinet.

[0039] The circuit breaker chamber 6 is provided with a circuit breaker switch 602, an inner cone bushing 604 and a lower bushing 603; the upper end of the inner cone bushing 604 is connected to the circuit breaker switch 602 via a busbar, and one end of the lower bushing 603 is connected to the circuit breaker switch 602 via a busbar;

[0040] The cable room 7 is equipped with a current transformer 705 and a voltage transformer 703. The lower end of the inner cone bushing 604 is connected to the incoming and outgoing cables 704 through an inner cone cable plug 706. The inner cone cable plug 706 adopts advanced plug-in technology and is not restricted by altitude. It is fully insulated, fully shielded, maintenance-free, and touchable, ensuring safety and reliability of use; the other end of the lower bushing 603 is connected to the voltage transformer 703 through a cable plug 701 and a high-voltage cable 702 for measuring and collecting bus voltage.

[0041] The busbar section I chamber 3 and the circuit breaker chamber 6 are connected by the first intermediate bushing 301, and the busbar section II chamber 5 and the circuit breaker chamber 6 are connected by the second intermediate bushing 506. The lower ends of the first intermediate bushing 301 and the second intermediate bushing 506 are respectively connected to the circuit breaker switch 602 through the busbar, and the upper ends of the first intermediate bushing 301 and the second intermediate bushing 506 are respectively provided with the busbar section I three-position switch 303 and the busbar section II three-position switch 504.

[0042] The three-station operating mechanism 202 of busbar section I is connected to busbar section I chamber 3 through the first magnetic fluid seal 302. The three-station operating mechanism 202 of busbar section I drives the first magnetic fluid seal 302. The first magnetic fluid seal 302 is arranged at the front side of busbar section I chamber 3. The three-station operating mechanism 208 of busbar section II is connected to busbar section II chamber 5 through the transmission rod 507 and the second magnetic fluid seal 505. The three-station operating mechanism 208 of busbar section II drives the transmission rod 507. The transmission rod 507 is in transmission connection with the second magnetic fluid seal 505. Figure 4 , the transmission can be in the form of a transmission belt or the like.

[0043] The three-position busbar switch 303 for section I and the three-position busbar switch 504 for section II are fixed above the first intermediate sleeve 301 and the second intermediate sleeve 506, respectively. Moving contacts slide within these switches. Insulating rods are connected to the first and second magnetic fluid seals 302 and 505, respectively, via screws. Rotation of the first and second magnetic fluid seals 302 and 505 drives the movement of the insulating rods. These insulating rods are in driving connection with the corresponding moving contacts, thereby actuating them. Wires or conductive structures are located within the first and second intermediate sleeves 301 and 506, providing electrical connection between the busbars and the moving contacts.

[0044] The instrument control room 2 is also provided with a small busbar duct 201, a secondary line duct 205, a pressure gauge 206 for the busbar section 3, a pressure gauge 207 for the busbar section 5 and a pressure gauge 209 for the circuit breaker chamber 6. The pressure gauge 206 for the busbar section 3 is used to detect the air pressure in the busbar section 3, the pressure gauge 207 for the busbar section 5 is used to detect the air pressure in the busbar section 5, and the pressure gauge 209 for the circuit breaker chamber 6 is used to detect the air pressure in the circuit breaker chamber 6.

[0045] The instrument control room 2 is also equipped with a comprehensive protector, secondary components, instruments, opening and closing control and indicating devices.

[0046] The pressure relief channel chamber 4 is arranged at the rear of the circuit breaker chamber 6 and above the section I busbar chamber 3 and the section II busbar chamber 5, and the pressure relief direction is top pressure relief.

[0047] A first pressure relief plate 401 and a second pressure relief plate 402 are provided at the upper end of the pressure relief channel chamber 4 .

[0048] A first pressure relief valve 306 is installed on the upper wall of the section I busbar chamber 3 , a second pressure relief valve 501 is installed on the upper wall of the section II busbar chamber 5 , and a third pressure relief valve 601 is provided on the side wall of the circuit breaker chamber 6 .

[0049] A first hoisting positioning block 305 is provided on the top of the busbar chamber 3 of section I for equipment hoisting and cabinet positioning. A second hoisting positioning block 502 is provided on the top of the busbar chamber 5 of section II for equipment hoisting and cabinet positioning.

[0050] Working principle:

[0051] The primary circuit is connected by the high-voltage cable 702, the inner cone cable plug 706 through the current transformer 705 and the inner cone sleeve 604 of the circuit breaker chamber 6, and then connected in parallel to the three-position switch 303 of the section I bus and the three-position switch 504 of the section II bus through the circuit breaker switch 602 to form a primary circuit. Under normal circumstances, only one bus is in operation and the other bus is used as a backup. Assuming that an extreme fault occurs in the normal operation of the section I bus, the faulty bus can be taken out of operation by switching between the three-position switch 303 of the section I bus and the circuit breaker switch 602, and the normal section II bus can be put into use to continue to ensure the power supply and distribution relationship of the primary circuit. At this time, maintenance personnel only need to repair the section I bus. Similarly, the operation cycle effect is provided to provide uninterrupted power supply.

[0052] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A double busbar C-GIS metal-enclosed switchgear, characterized by: The switch cabinet body (1) comprises a pressure relief channel chamber (4) and a plurality of independent chamber bodies that can be connected to and disconnected from the pressure relief channel chamber (4). The chamber bodies comprise: An instrument control room (2), wherein the instrument control room (2) is provided with a busbar section I three-position operating mechanism (202), a busbar section II three-position operating mechanism (208), a circuit breaker mechanism (204), a circuit breaker mechanical interlock, and a three-position operating mechanism interlock (203); The busbar section I chamber (3) is arranged above the circuit breaker chamber (6) and behind the instrument control chamber (2), and is provided with a first side splicing sleeve (304) therein, the first side splicing sleeve (304) being connected to the busbar connector for expanding the splicing cabinet; The busbar section II chamber (5) is arranged above the circuit breaker chamber (6) and behind the busbar section I chamber (3), and is provided with a second side splicing sleeve (503) therein, the second side splicing sleeve (503) being connected to the busbar connector for expanding the splicing cabinet; A circuit breaker chamber (6), wherein the circuit breaker chamber (6) is provided with a circuit breaker switch (602), an inner cone bushing (604), and a lower bushing (603); the upper end of the inner cone bushing (604) is connected to the circuit breaker switch (602) via a busbar, and one end of the lower bushing (603) is connected to the circuit breaker switch (602) via the busbar; A cable chamber (7), wherein the cable chamber (7) is provided with a current transformer (705) and a voltage transformer (703); the lower end of the inner cone bushing (604) is connected to the incoming and outgoing cables (704) via an inner cone cable plug (706); the other end of the lower bushing (603) is connected to the voltage transformer (703) via a cable plug (701) and a high-voltage cable (702) for measuring and collecting bus voltage; The busbar section I chamber (3) and the circuit breaker chamber (6) are connected by a first intermediate bushing (301), and the busbar section II chamber (5) and the circuit breaker chamber (6) are connected by a second intermediate bushing (506). The lower ends of the first intermediate bushing (301) and the second intermediate bushing (506) are respectively connected to the circuit breaker switch (602) through busbars. The upper ends of the first intermediate bushing (301) and the second intermediate bushing (506) are respectively provided with a busbar section I three-position switch (303) and a busbar section II three-position switch (504). The busbar section I three-station operating mechanism (202) is connected to the busbar section I chamber (3) through the first magnetic fluid seal (302), the busbar section I three-station operating mechanism (202) drives the first magnetic fluid seal (302), and the first magnetic fluid seal (302) is arranged on the front side of the busbar section I chamber (3), the busbar section II three-station operating mechanism (208) is connected to the busbar section II chamber (5) through the transmission rod (507) and the second magnetic fluid seal (505), the busbar section II three-station operating mechanism (208) drives the transmission rod (507), and the transmission rod (507) is connected to the second magnetic fluid seal (505) by transmission, and the transmission connection adopts a transmission belt; The three-position switch (303) of the busbar section I and the three-position switch (504) of the busbar section II are respectively fixed on the first intermediate sleeve (301) and the second intermediate sleeve (506). Moving contacts are slidably provided in the three-position switch (303) of the busbar section I and the three-position switch (504) of the busbar section II. Insulating rods are respectively connected to the first magnetic fluid seal (302) and the second magnetic fluid seal (505) by means of screw rods. The insulating rods are transmission-connected to the moving contacts at corresponding positions, thereby driving the moving contacts at corresponding positions to move.

2. The double-busbar C-GIS metal-enclosed switchgear according to claim 1, characterized in that: The instrument control room (2) is further provided with a small busbar duct (201), a secondary line duct (205), a section I busbar chamber pressure gauge (206), a section II busbar chamber pressure gauge (207) and a circuit breaker chamber pressure gauge (209). The section I busbar chamber pressure gauge (206) is used to detect the air pressure in the section I busbar chamber (3), the section II busbar chamber pressure gauge (207) is used to detect the air pressure in the section II busbar chamber (5), and the circuit breaker chamber pressure gauge (209) is used to detect the air pressure in the circuit breaker chamber (6).

3. The double-busbar C-GIS metal-enclosed switchgear according to claim 1, characterized in that: The instrument control room (2) is also equipped with a comprehensive protector, secondary components, instruments, opening and closing control and indicating devices.

4. The double-busbar C-GIS metal-enclosed switchgear according to claim 1, characterized in that: The pressure relief channel chamber (4) is arranged at the rear of the circuit breaker chamber (6) and the upper part of the busbar chamber (3) and the busbar chamber (5) of section I, and the pressure relief direction is top pressure relief.

5. The double-busbar C-GIS metal-enclosed switchgear according to claim 4, characterized in that: The upper end of the pressure relief channel chamber (4) is provided with a first pressure relief plate (401) and a second pressure relief plate (402).

6. The double-busbar C-GIS metal-enclosed switchgear according to claim 5, characterized in that: The upper wall of the section I busbar chamber (3) is provided with a first pressure relief valve (306), the upper wall of the section II busbar chamber (5) is provided with a second pressure relief valve (501), and the side wall of the circuit breaker chamber (6) is provided with a third pressure relief valve (601).

7. The double-busbar C-GIS metal-enclosed switchgear according to claim 1, characterized in that: A first hoisting positioning block (305) is provided on the top of the section I busbar chamber (3) for hoisting equipment and positioning the cabinet assembly, and a second hoisting positioning block (502) is provided on the top of the section II busbar chamber (5) for hoisting equipment and positioning the cabinet assembly.

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