A quick-change gas-insulated switchgear for subway use

Abstract

A quick-changeable gas-insulated switchgear for subway use includes a base with a cable compartment connected to it. A three-position disconnector gas compartment and a circuit breaker gas compartment are connected to the cable compartment. The three-position disconnector gas compartment and the circuit breaker gas compartment are connected to the upper part of the cable compartment. The three-position disconnector gas compartment and the circuit breaker gas compartment are detachably connected and communicated via a bushing connector. The bottom of the three-position disconnector gas compartment has a stud, and the top of the circuit breaker gas compartment has a positioning hole. The positioning hole mates with the stud at the bottom of the three-position disconnector gas compartment, reducing operational difficulty, saving time and effort, and improving work efficiency during gas compartment replacement.

Description

Technical Field

[0001] This application relates to the technical field of switchgear, and in particular to a gas-insulated switchgear for subway use that can be quickly replaced. Background Technology

[0002] Gas-insulated switchgear typically adopts a modular design, consisting of a sealed enclosure, a low-voltage chamber, a cable chamber, and a pressure relief channel. The sealed enclosure is constructed using welding technology, and all high-voltage components are sealed within a sulfur hexafluoride gas chamber, providing a high level of protection. It can operate stably in harsh environments such as condensation, pollution, and salt spray. Therefore, gas-insulated switchgear is widely used in subway systems.

[0003] In the existing technology, the gas-insulated switchgear used in subways adopts a side-expanded double-chamber design. The high-voltage components in the two chambers are connected by connecting bushings. Although this structure places the three-position disconnector and circuit breaker in two different chambers, the assembled gas box is still a closed whole. Therefore, when the three-position switch chamber or the circuit breaker chamber fails, the entire gas box still needs to be replaced. Moreover, the gas-insulated switchgear with the side-expanded structure uses a side-expanded bus coupler to connect the cabinets and the busbars are connected by tightening the cabinet body.

[0004] However, in the existing technology, when replacing the entire gas box, it is necessary to first move the entire section of switch cabinets one by one, remove the side expansion bus coupler, then drag the switch cabinet body that needs to be replaced out of the parallel line and replace the gas box, and then connect the cabinets one by one after the replacement. The operation is difficult, time-consuming and labor-intensive, and the work efficiency is low. Utility Model Content

[0005] This utility model provides a quick-replaceable gas-insulated switchgear for subway use, which reduces operational difficulty, saves time and effort, and improves work efficiency during gas box replacement.

[0006] To achieve the aforementioned objectives, this application adopts the following technical solution:

[0007] A quick-replaceable gas-insulated switchgear for subway use, characterized in that it includes...

[0008] A base on which a cable compartment is connected;

[0009] A three-position disconnector gas chamber and a circuit breaker gas chamber are connected to the cable compartment. The three-position disconnector gas chamber and the circuit breaker gas chamber are connected to the upper part of the cable compartment. The three-position disconnector gas chamber and the circuit breaker gas chamber are detachably connected and communicate with each other through a bushing connector. The bottom of the three-position disconnector gas chamber is provided with a stud, and the top of the circuit breaker gas chamber is provided with a positioning hole. The positioning hole cooperates with the stud at the bottom of the three-position disconnector gas chamber.

[0010] In some optional embodiments, a connecting bend plate is provided on the connecting surface of the three-position disconnector gas chamber and the circuit breaker gas chamber. The connecting bend plate on the three-position disconnector gas chamber and the circuit breaker gas chamber is fastened by bolts passing through it.

[0011] In some optional embodiments, the three-position disconnector air chamber includes a housing, an insulating sleeve, a three-position disconnector, a connecting sleeve, and a sealing plate. The top of the housing is provided with at least three sets of insulating sleeves. Each set of insulating sleeves includes two insulating sleeves. The insulating sleeves in adjacent sets are distributed along the Y direction, and the two insulating sleeves in the same set are distributed along the X direction. Each set of insulating sleeves corresponds to one three-position disconnector, and the insulating sleeve is connected to the three-position disconnector.

[0012] In some alternative embodiments, the bottom of the three-position disconnector air chamber is connected to three connecting sleeves, which are connected to the three-position disconnector.

[0013] In some optional embodiments, the back of the housing of the three-position isolating switch chamber is provided with a square hole, which is sealed by a sealing plate.

[0014] In some alternative embodiments, the circuit breaker chamber includes a housing, a vacuum circuit breaker, a first inner cone socket, and a second inner cone socket. A support plate is connected to the top of the housing, and the support plate is provided with positioning holes. Three connecting sleeves are connected to the top of the housing, and the vacuum circuit breaker is connected to each connecting sleeve.

[0015] In some alternative embodiments, the position of the connecting sleeve on the housing of the circuit breaker chamber corresponds to the position of the connecting sleeve on the outer shell of the three-position disconnector chamber.

[0016] In some optional embodiments, the bottom of the housing is further provided with three first inner cone sockets and three second inner cone sockets, and the back of the housing is also provided with three first inner cone sockets. Each of the first inner cone sockets and the second inner cone sockets is connected to the outlet of the solid-sealed pole on the vacuum circuit breaker through a copper busbar.

[0017] In some alternative embodiments, an inner cone socket mounting sleeve is also connected to the bottom of the circuit breaker chamber.

[0018] In some optional embodiments, the system further includes an instrument compartment, a disconnector mechanism compartment, a circuit breaker mechanism compartment, a lower pressure relief compartment, and an upper pressure relief compartment. The circuit breaker mechanism compartment is located above the cable compartment and at the front of the gas box. The circuit breaker mechanism compartment is fixedly connected to both the cable compartment and the circuit breaker gas box using screws, and the height of the circuit breaker mechanism compartment is the same as that of the circuit breaker gas box. The lower pressure relief compartment is located above the cable compartment and at the rear of the gas box. The lower pressure relief compartment is also fixedly connected to both the cable compartment and the circuit breaker gas box using screws, and the height of the lower pressure relief compartment is the same as that of the circuit breaker gas box. The disconnector mechanism chamber is located above the circuit breaker mechanism chamber and at the front of the gas box. The disconnector mechanism chamber is fixed to both the circuit breaker mechanism chamber and the three-position disconnector gas chamber using screw connections. The disconnector mechanism chamber and the three-position disconnector gas chamber are at the same height. The upper pressure relief chamber is located above the lower pressure relief chamber and at the rear of the gas box. The upper pressure relief chamber is fixed to both the lower pressure relief chamber and the three-position disconnector gas chamber using screw connections. The instrument chamber is located above the disconnector mechanism chamber and at the front of the three-position disconnector gas chamber.

[0019] The quick-replaceable gas-insulated switchgear for subway use provided in this application has the following advantages:

[0020] The technical solution adopted in this application includes a quick-replaceable gas-insulated switchgear for subway use, comprising a base on which a cable compartment is connected; a three-position disconnector gas compartment and a circuit breaker gas compartment connected to the cable compartment, the three-position disconnector gas compartment and the circuit breaker gas compartment being connected to the upper part of the cable compartment; the three-position disconnector gas compartment and the circuit breaker gas compartment being detachably connected and connected through a bushing connector; a stud is provided at the bottom of the three-position disconnector gas compartment; and a positioning hole is provided at the top of the circuit breaker gas compartment; the positioning hole cooperates with the stud at the bottom of the three-position disconnector gas compartment. Through the detachable connection between the three-position disconnector gas compartment and the circuit breaker gas compartment, the three-position disconnector gas compartment and the circuit breaker gas compartment can be individually assembled and packaged inside the gas box. In case of failure, they can be replaced individually, reducing operational difficulty, saving time and effort, and improving work efficiency. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1This is a schematic diagram of the internal structure of a quick-replaceable gas-insulated switchgear for subway use, as described in this application.

[0023] Figure 2 This is a perspective view of the three-position isolating switch chamber in a quick-replaceable gas-insulated switchgear for subway use, as described in this application.

[0024] Figure 3 This is a perspective view of the gas chamber of a quick-replaceable gas-insulated switchgear circuit breaker for subway use, as described in this application.

[0025] Figure 4 This is a structural diagram from another perspective of a quick-replaceable gas-insulated switchgear for subway use, as described in this application.

[0026] Figure 5 This is a perspective view of a bushing connector in a gas-insulated switchgear for subway use that can be quickly replaced, as described in this application.

[0027] Figure label:

[0028] 10. Instrument room; 11. Disconnecting switch mechanism room; 12. Circuit breaker mechanism room; 13. Cable room; 14. Base; 15. Lower pressure relief chamber; 16. Upper pressure relief chamber; 17. Bushing connector; 18. Busbar;

[0029] 20. Three-position disconnector air chamber; 21. Stud; 22. Housing; 221. Square hole; 23. Insulating sleeve; 24. Three-position disconnector; 25. Connecting sleeve; 26. Sealing plate;

[0030] 30. Circuit breaker chamber; 31. Positioning hole; 32. Housing; 33. Vacuum circuit breaker; 34. First inner cone socket; 35. Second inner cone socket; 36. Support plate; 37. Inner cone socket mounting sleeve. Detailed Implementation

[0031] The specific embodiments of this application are described below with reference to the accompanying drawings and examples. Through the content described in this specification, those skilled in the art can clearly and completely understand the technical solution, the technical problem solved, and the resulting technical effects of this application. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, for ease of description, only the parts related to this application are shown in the accompanying drawings.

[0032] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the contents described in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size should fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0033] The use of terms such as "first," "second," and "the" does not imply quantity limitation and may indicate singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or units, but may also include steps or units not listed, or other steps or units inherent to such processes, methods, products, or devices. The terms "connected," "linked," and "coupled" used in this application are not limited to physical or mechanical connections, but may also include direct or indirect electrical connections.

[0034] It should also be noted that the longitudinal section corresponding to the embodiment of this application can be the section corresponding to the front view direction, the transverse section can be the section corresponding to the right view direction, and the horizontal section can be the section corresponding to the top view direction.

[0035] Furthermore, where there is no conflict, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] A quick-changeable gas-insulated switchgear for subway use includes an instrument compartment 10, a disconnector mechanism compartment 11, a circuit breaker mechanism compartment 12, a cable compartment 13, a base 14, a lower pressure relief compartment 15, an upper pressure relief compartment 16, a three-position disconnector gas compartment 20, and a circuit breaker gas compartment 30.

[0037] The upper part of the base 14 is connected to the cable chamber 13, and the upper part of the cable chamber 13 is connected to the three-position disconnector gas chamber 20 and the circuit breaker gas chamber 30. The three-position disconnector gas chamber 20 and the circuit breaker gas chamber 30 are detachably connected and communicated through the bushing connector 17. Specifically, the bottom of the three-position disconnector gas chamber 20 is provided with a stud 21, and the top of the circuit breaker gas chamber 30 is provided with a positioning hole 31. The positioning hole 31 corresponds to the position of the stud 21 at the bottom of the three-position disconnector gas chamber 20. The mutual cooperation between 31 is used to locate the position between the three-position disconnector gas chamber 20 and the circuit breaker gas chamber 30. Then, the connecting plates (not shown in the figure) are provided on the connecting surfaces of the three-position disconnector gas chamber 20 and the circuit breaker gas chamber 30. The bolts pass through the connecting plates on the three-position disconnector gas chamber 20 and the circuit breaker gas chamber 30 to achieve the fastening between the three-position disconnector gas chamber 20 and the circuit breaker gas chamber 30. It should be noted that the bushing connector 17 is made of insulating rubber and conductive copper rod. The three-position disconnector gas chamber 20 includes a housing 22, insulating sleeves 23, a three-position disconnector 24, connecting sleeves 25, and a sealing plate 26. The housing 22 of the three-position disconnector gas chamber 20 is welded from stainless steel plate. The top of the housing 22 is provided with at least three sets of insulating sleeves 23. Each set of insulating sleeves 23 includes two insulating sleeves 23. The insulating sleeves 23 in adjacent sets are distributed along the Y direction, and the two insulating sleeves 23 in the same set are distributed along the X direction. Each set of insulating sleeves 23 is connected to each other by a copper busbar (not shown in the figure). The connected insulating sleeves 23 are connected to the three positions inside the three-position disconnector gas chamber 20. The disconnector switch 24 is also connected via copper busbars. One set of insulating bushings 23 corresponds to one three-position disconnector switch 24. The insulating bushings 23 are connected to the three-position disconnector switch 24. It should be noted that the insulating bushings 23 are connected to the three-phase isolating contacts of the three-position disconnector switch 24. Three connecting bushings 25 are connected to the bottom of the gas chamber 20 of the three-position disconnector switch. The connecting bushings 25 are connected to the three-position disconnector switch 24. Specifically, the connection between the connecting bushings 25 and the three-position disconnector switch 24 is a bolt connection. The lower conductive surface of the middle stationary contact of the three-position disconnector switch 24 is in contact with the upper conductive surface of the connecting bushings 25.

[0038] The back of the outer shell 22 of the three-position disconnector gas chamber 20 is provided with a square hole 221, which allows for the installation and debugging of internal components through the square hole 221. The square hole 221 is sealed by a sealing pressure plate 26. The circuit breaker gas chamber 30 includes a shell 32, a vacuum circuit breaker 33, a first inner cone socket 34, and a second inner cone socket 35. A support plate 36 is connected to the top of the shell 32, and the support plate 36 is provided with positioning holes 31. Three connecting sleeves 25 are connected to the top of the shell 32, and each connecting sleeve 25 is connected to a vacuum circuit breaker 33. It should be noted that the position of the connecting sleeve 25 on the shell 32 of the circuit breaker gas chamber 30 corresponds to the position of the connecting sleeve 25 on the outer shell 22 of the three-position disconnector gas chamber 20. The connecting sleeve 25 on the circuit breaker gas chamber 30 is connected to the vacuum circuit breaker. The inlet socket of the solid-sealed pole on the circuit breaker 33 is connected via a copper busbar; the bottom of the housing 32 is also provided with three first inner cone sockets 34 and three second inner cone sockets 35, and the back of the housing 32 is also provided with three first inner cone sockets 34. Specifically, each first inner cone socket 34 and second inner cone socket 35 is connected to the outlet socket of the solid-sealed pole on the vacuum circuit breaker 33 via a copper busbar. The first inner cone sockets 34 provided on the back of the housing 32 of the circuit breaker chamber 30 are used during the test process. During normal operation of the switchgear, the housing of the circuit breaker chamber 30 is... The first inner cone socket 34 on the back of the 32 is sealed with an insulating plug. During testing, the insulating plug is removed, and the test cable is inserted to conduct the relevant tests. The first inner cone socket 34 on the bottom of the housing 32 is used to connect the surge arrester, and the second inner cone socket 35 connects the cable for power transmission. The back of the housing 32 of the circuit breaker chamber 30 has a square hole 221, allowing for the installation and adjustment of internal components through this hole, and also sealing the square hole 221 with a sealing plate 26. Furthermore, the circuit breaker chamber 30... The bottom is also connected to an inner cone socket mounting sleeve 37, which allows the mounting surface of the first inner cone socket 34 to be lower than the bottom of the gas box. A through-type current transformer is configured outside the inner cone socket mounting sleeve 37 so that the cable head of the first inner cone socket 34 is also within the monitoring and protection range of the current transformer. If a short circuit fault occurs at the cable head of the first inner cone socket 34 and the current transformer detects the fault, the external protection device immediately gives a trip signal to the vacuum circuit breaker 33, disconnecting the vacuum circuit breaker 33 and protecting the equipment. In addition, the housing 32 is made of stainless steel.

[0039] The circuit breaker mechanism compartment 12 is located above the cable compartment 13 and at the front of the gas box. The circuit breaker mechanism compartment 12 is fixedly connected to both the cable compartment 13 and the circuit breaker gas chamber 30 using screws, and the heights of the circuit breaker mechanism compartment 12 and the circuit breaker gas chamber 30 are the same. The lower pressure relief compartment 15 is located above the cable compartment 13 and at the rear of the gas box. The lower pressure relief compartment 15 is fixedly connected to both the cable compartment 13 and the circuit breaker gas chamber 30 using screws, and the heights of the lower pressure relief compartment 15 and the circuit breaker gas chamber 30 are the same. The disconnector mechanism compartment 11 is located above the circuit breaker mechanism compartment 12 and at the front of the gas box. The disconnector mechanism compartment 11 is fixedly connected to both the circuit breaker mechanism compartment 12 and the three-position disconnector gas chamber 20 using screws, and the heights of the disconnector mechanism compartment 11 and the three-position disconnector gas chamber 20 are the same. The upper pressure relief chamber 16 is located above the lower pressure relief chamber 15 and at the rear of the gas box. The upper pressure relief chamber 16 is fixed to both the lower pressure relief chamber 15 and the three-position disconnector gas chamber 20. The instrument chamber 10 is located above the disconnector mechanism chamber 11 and at the front of the three-position disconnector gas chamber 20.

[0040] Here, the quick-replaceable gas-insulated switchgear for subway use includes a base 14, on which a cable compartment 13 is connected; a three-position disconnector gas compartment 20 and a circuit breaker gas compartment 30 are connected to the cable compartment 13, and are connected to the upper part of the cable compartment 13. The three-position disconnector gas compartment 20 and the circuit breaker gas compartment 30 are detachably connected and communicated through a bushing connector 17. The bottom of the three-position disconnector gas compartment 20 is provided with a stud 21, and the top of the circuit breaker gas compartment 30 is provided with a positioning hole 31. The positioning hole 31 cooperates with the stud 21 at the bottom of the three-position disconnector gas compartment 20. Through the detachable connection between the three-position disconnector gas compartment 20 and the circuit breaker gas compartment 30, the three-position disconnector gas compartment 20 and the circuit breaker gas compartment 30 can be individually assembled and packaged inside the gas box, and can be replaced individually in case of failure. This reduces operational difficulty, saves time and effort, and improves work efficiency. In addition, the entire switchgear section after paralleling is connected via busbar 18. Each busbar 18 consists of two three-way bus couplers and one solid busbar 18. The three-way bus couplers of each section of busbar 18 are connected to the insulating bushings 23 of the two adjacent switchgear sections, forming the busbar 18 connection between the switchgear sections. The busbar 18 connection within the cabinet is connected via the copper busbar inside the three-position isolating switch chamber 20 through the insulating bushings 23. It should be noted that the distributed top expansion busbar position achieves the connection of the busbar 18 of the entire switchgear section through alternating connections within and between cabinets. Serious faults within the switchgear are mostly faults in the high-voltage components. For example, after the insulating bushing 23 or vacuum circuit breaker 33 experiences a breakdown fault, the insulation performance of the product is reduced and cannot meet the normal operation requirements of the product. Only after replacing it with a product that meets the requirements can the switchgear continue to operate.

[0041] To facilitate understanding, the working principle of this application is further described as follows: a quick-change gas-insulated switchgear specifically for subway use.

[0042] When the disconnector mechanism chamber 11 and the three-position disconnector gas chamber 20 need to be replaced due to a fault, first remove the relevant sealing plates of the top busbar 18, the instrument chamber 10 and the upper pressure relief chamber 16 in sequence. Then remove the busbar 18 connected to the three-position disconnector gas chamber 20 to be replaced. Finally, remove the fastening bolts of the disconnector mechanism chamber 11 and the circuit breaker mechanism chamber 12, and remove the disconnector mechanism chamber 11 and the three-position disconnector gas chamber 20 as a whole for replacement. After the replacement is completed, restore the removed components in sequence. This completes the quick replacement of the three-position disconnector gas chamber 20 and the disconnector mechanism chamber 11.

[0043] When the circuit breaker air chamber 30 needs to be replaced due to a fault, first remove the fastening bolts between the base 14 and the cable chamber 13, pull out the base 14, then treat the circuit breaker mechanism chamber 12, cable chamber 13, lower pressure relief chamber 15, and circuit breaker air chamber 30 as a whole, remove its connection with other components, including the fastening bolts between components, and remove the connecting bolts between switch cabinets, so that the circuit breaker mechanism chamber 12, cable chamber 13, lower pressure relief chamber 15, and circuit breaker air chamber 30 fall to the bottom at the same time. At this time, the circuit breaker air chamber 30 and the bushing connector 17 are separated. Finally, the circuit breaker mechanism chamber 12, cable chamber 13, lower pressure relief chamber 15, and circuit breaker air chamber 30 are pulled out as a whole. After the extraction, the circuit breaker air chamber 30 is replaced. After the replacement is completed, the disassembled components are restored in sequence, thus completing the quick replacement of the circuit breaker air chamber 30.

[0044] When the vacuum circuit breaker 33 needs to be replaced due to a fault, first open the door of the lower pressure relief chamber 15, remove the sealing plate 26 of the circuit breaker gas chamber 30, then remove the copper busbar bolts connecting the inlet and outlet terminals of the vacuum circuit breaker 33, then remove the fastening nuts between the vacuum circuit breaker 33 and the sealing aluminum plate (not shown in the figure), and then pull the vacuum circuit breaker 33 out of the circuit breaker gas chamber 30; finally, install the qualified vacuum circuit breaker 33 of the same model onto the circuit breaker gas chamber 30, tighten the sealing aluminum plate to the vacuum circuit breaker 33 with nuts, then tighten the copper busbar connecting the vacuum circuit breaker 33 to the circuit breaker gas chamber 30, and finally install the sealing plate 26, thus completing the quick replacement of the vacuum circuit breaker 33.

[0045] In this application, the faulty parts of the switchgear are typically the three-position disconnector gas chamber 20, the circuit breaker gas chamber 30, and the vacuum circuit breaker 33, thus solving the problem of rapid replacement. The switchgear of this application adopts a highly modular design, with independent gas chambers, a distributed top-expanded busbar design for busbar 18, and a functional unit modular design for the switchgear body. The switchgear of this application allows for the replacement of faulty components without affecting non-faulty equipment or non-faulty components of faulty equipment. That is, if the three-position disconnector gas chamber 20 fails, only the three-position disconnector gas chamber 20 needs to be replaced; the circuit breaker gas chamber 30 does not need to be replaced. Similarly, if the circuit breaker gas chamber 30 fails, only... When replacing the circuit breaker gas chamber 30, the three-position disconnector gas chamber 20 does not need to be replaced; if the vacuum circuit breaker 33 fails, only the vacuum circuit breaker 33 needs to be replaced, and other components do not need to be replaced; this application adopts independent gas chambers and distributed busbars. Compared with integrated welded gas chambers, independent gas chambers have the advantage of modularity. The three-position disconnector gas chamber 20 and the circuit breaker gas chamber 30 can be assembled and packaged separately and replaced individually when a fault occurs. In contrast, with integrated welded gas chambers, the entire gas chamber needs to be replaced if any gas chamber fails; compared with integrated busbars, distributed busbars are simpler to assemble and easier to operate. This application can shorten fault repair time, improve operation and maintenance quality and efficiency, and reduce economic losses.

[0046] Although this application has been described and illustrated with reference to specific embodiments thereof, such description and illustration are not limiting of this application. It will be readily understood by those skilled in the art that various changes can be made and equivalent elements can be substituted within embodiments without departing from the true spirit and scope of this application as defined by the appended claims. Illustrations may not be drawn to scale. Differences may exist between the technical representation in this application and actual implementation due to variables in the manufacturing process, etc. Other embodiments of this application may exist that are not specifically described. The description and illustrations should be considered illustrative rather than restrictive. Modifications can be made to adapt particular circumstances, materials, composition, methods, or processes to the objectives, spirit, and scope of this application. All such modifications fall within the scope of the appended claims. While the methods disclosed herein have been described with reference to specific operations performed in a particular order, it should be understood that these operations can be combined, subdivided, or reordered to form equivalent methods without departing from the teachings of this application. Therefore, unless specifically indicated herein, the order and grouping of operations do not limit this application.

Claims

1. A quick-replaceable gas-insulated switchgear for subway use, characterized in that, include A base (14) on which a cable chamber (13) is connected; A three-position disconnector gas chamber (20) and a circuit breaker gas chamber (30) are connected to the cable chamber (13). The three-position disconnector gas chamber (20) and the circuit breaker gas chamber (30) are connected to the upper part of the cable chamber (13). The three-position disconnector gas chamber (20) and the circuit breaker gas chamber (30) are detachably connected and communicated through a bushing connector (17). The bottom of the three-position disconnector gas chamber (20) is provided with a stud (21), and the top of the circuit breaker gas chamber (30) is provided with a positioning hole (31). The positioning hole (31) cooperates with the stud (21) at the bottom of the three-position disconnector gas chamber (20).

2. The quick-replaceable gas-insulated switchgear for subway use according to claim 1, characterized in that, A connecting bend plate is provided on the connecting surface of the three-position disconnector air chamber (20) and the circuit breaker air chamber (30). The connecting bend plate on the three-position disconnector air chamber (20) and the circuit breaker air chamber (30) is fastened by bolts passing through it.

3. The quick-replaceable gas-insulated switchgear for subway use according to claim 2, characterized in that, The three-position disconnector air chamber (20) includes a shell (22), an insulating sleeve (23), a three-position disconnector (24), a connecting sleeve (25), and a sealing plate (26). The top of the shell (22) is provided with at least three sets of insulating sleeves (23). Each set of insulating sleeves (23) includes two insulating sleeves (23). The insulating sleeves (23) of adjacent sets are distributed along the Y direction, and the two insulating sleeves (23) of the same set are distributed along the X direction. Each set of insulating sleeves (23) corresponds to one three-position disconnector (24), and the insulating sleeves (23) are connected to the three-position disconnector (24).

4. The quick-replaceable gas-insulated switchgear for subway use according to claim 3, characterized in that, The bottom of the three-position disconnector air chamber (20) is connected to three connecting sleeves (25), which are connected to the three-position disconnector (24).

5. The quick-replaceable gas-insulated switchgear for subway use according to claim 4, characterized in that, The back of the outer shell (22) of the three-position isolation switch air chamber (20) is provided with a square hole (221), which is sealed by a sealing pressure plate (26).

6. The quick-replaceable gas-insulated switchgear for subway use according to claim 5, characterized in that, The circuit breaker chamber (30) includes a housing (32), a vacuum circuit breaker (33), a first inner cone socket (34) and a second inner cone socket (35). A support plate (36) is connected to the top of the housing (32). The support plate (36) is provided with a positioning hole (31). Three connecting sleeves (25) are connected to the top of the housing (32). The vacuum circuit breaker (33) is connected to each connecting sleeve (25).

7. The quick-replaceable gas-insulated switchgear for subway use according to claim 6, characterized in that, The position of the connecting sleeve (25) on the housing (32) of the circuit breaker chamber (30) corresponds to the position of the connecting sleeve (25) on the outer shell (22) of the three-position disconnect switch chamber (20).

8. The quick-replaceable gas-insulated switchgear for subway use according to claim 7, characterized in that, The bottom of the housing (32) is also provided with three first inner cone sockets (34) and three second inner cone sockets (35), and the back of the housing (32) is also provided with three first inner cone sockets (34). Each first inner cone socket (34) and second inner cone socket (35) is connected to the outlet of the solid-sealed pole on the vacuum circuit breaker (33) through a copper busbar.

9. The quick-replaceable gas-insulated switchgear for subway use according to claim 8, characterized in that, The bottom of the circuit breaker chamber (30) is also connected to an inner cone socket mounting sleeve (37).

10. The quick-replaceable gas-insulated switchgear for subway use according to claim 9, characterized in that, It also includes an instrument compartment (10), a disconnector mechanism compartment (11), a circuit breaker mechanism compartment (12), a lower pressure relief compartment (15), and an upper pressure relief compartment (16). The circuit breaker mechanism compartment (12) is located above the cable compartment (13) and at the front of the gas box. The circuit breaker mechanism compartment (12) is fixedly connected to the cable compartment (13) and the circuit breaker gas chamber (30) by screws, and the height of the circuit breaker mechanism compartment (12) and the circuit breaker gas chamber (30) are the same. The lower pressure relief compartment (15) is located above the cable compartment (13) and at the rear of the gas box. The lower pressure relief compartment (15) is fixedly connected to the cable compartment (13) and the circuit breaker gas chamber (30) by screws, and the height of the lower pressure relief compartment (15) and the circuit breaker gas chamber (30) are the same. The disconnector mechanism chamber (11) is located above the circuit breaker mechanism chamber (12) and at the front of the gas box. The disconnector mechanism chamber (11) is fixed to the circuit breaker mechanism chamber (12) and the three-position disconnector gas chamber (20) by screw connection. The disconnector mechanism chamber (11) and the three-position disconnector gas chamber (20) are at the same height. The upper pressure relief chamber (16) is located above the lower pressure relief chamber (15) and at the rear of the gas box. The upper pressure relief chamber (16) is fixed to the lower pressure relief chamber (15) and the three-position disconnector gas chamber (20) by screw connection. The instrument chamber (10) is located above the disconnector mechanism chamber (11) and at the front of the three-position disconnector gas chamber (20).

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