Double-layer medium-voltage switch cabinet

Abstract

The invention relates to the technical field of switch cabinets, in particular to a double-layer medium-voltage switch cabinet which comprises a switch cabinet body, a mounting base is fixedly connected to the lower end of the switch cabinet body, a handcart chamber, a bus chamber and a cable chamber are sequentially arranged in the switch cabinet body from front to back, and the handcart chamber comprises a lower handcart chamber and an upper handcart chamber. The lower handcart chamber and the upper handcart chamber are internally provided with handcart circuit breakers, the cable chamber comprises a lower cable chamber and an upper cable chamber, the upper side of the upper handcart chamber is provided with an instrument chamber, and the bus chamber is internally provided with a bus incoming line group. A side wall of the bus chamber is provided with a bus expansion terminal, a lower outgoing line contact, an upper outgoing line contact, a lower outgoing line terminal, an upper outgoing line terminal, a lower incoming line contact and an upper incoming line contact. Two groups of internal electric parts of the switch cabinet body are longitudinally integrated in the double-layer switch cabinet body, and a bus incoming line path is optimized through the bus incoming line group, so that double-path control can be realized by a single cabinet body, the number of transverse cabinet bodies is effectively reduced, the longitudinal space is fully utilized, and the space utilization rate is improved.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and specifically to a double-layer medium-voltage switchgear. Background Technology

[0002] A switchgear is an electrical device. External lines first enter the main control switch inside the switchgear, and then enter the branch control switches. Each branch is set according to its needs, such as instruments, automatic control, motor magnetic switches, various AC contactors, etc. Some switchgear also have high-voltage and low-voltage compartments and high-voltage busbars, such as power plants.

[0003] In existing 7.2kV and 12kV medium-voltage power distribution systems with incoming lines, the switchgear is generally arranged in a single layer. When multiple switchgear units are used together, they are mostly arranged horizontally. This results in a large footprint for single-layer switchgear installed in the power distribution room, which cannot make full use of the vertical space of the power distribution room, leading to higher operating costs. In addition, the production process also requires a large footprint, which will increase the production costs of the manufacturer.

[0004] Therefore, it is necessary to invent a double-layer medium-voltage switchgear to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a double-layer medium-voltage switchgear to solve the problems in the prior art where switchgear is mostly used in combination with a horizontal arrangement, which occupies a large horizontal area, requires a large power distribution room space, and requires a large placement space during production, resulting in high usage and production costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a double-layer medium-voltage switchgear, comprising a switchgear body, wherein a mounting base is fixedly connected to the lower end of the switchgear body, and the switchgear body is provided with a truck compartment, a busbar compartment, and a cable compartment in sequence from front to back. The truck compartment includes a lower truck compartment and an upper truck compartment, and a truck circuit breaker is installed inside both the lower truck compartment and the upper truck compartment. The cable compartment includes a lower cable compartment and an upper cable compartment. An instrument compartment is provided on the upper side of the upper truck compartment. A busbar inlet group is installed inside the busbar compartment, and a busbar extension terminal, a lower outgoing contact, an upper outgoing contact, a lower outgoing terminal, an upper outgoing terminal, a lower ingoing contact, and an upper ingoing contact are installed on the side wall of the busbar compartment.

[0007] By adopting the above technical solution and appropriately increasing the height of the cabinet, the internal electrical components of the two sets of switch cabinets are vertically integrated into the double-layer switch cabinet. The busbar incoming path is optimized through the busbar incoming group. At this time, a single cabinet can realize dual-circuit control, thereby effectively reducing the number of horizontal cabinets and making full use of vertical space, effectively reducing the floor area of ​​the switch cabinet, improving space utilization, and reducing user operating costs and manufacturer production costs.

[0008] Optionally, the busbar expansion terminal is provided in six sets, and the six sets of busbar expansion terminals are respectively fixed on the left and right sides of the upper wall of the busbar compartment. The lower inlet contact and the upper inlet contact are each provided in three sets. The three sets of lower inlet contacts are fixed between the front wall of the busbar compartment and the lower handcart compartment, and the three sets of upper inlet contacts are fixed between the front wall of the busbar compartment and the upper handcart compartment.

[0009] By adopting the above technical solution, the busbar extension terminal is used to connect and extend the busbars of two adjacent switch cabinets.

[0010] Optionally, both the lower and upper outgoing contacts are provided in three sets. The three sets of lower outgoing contacts are fixed on the front wall of the busbar chamber above the lower incoming contacts, and the three sets of upper outgoing contacts are fixed on the front wall of the busbar chamber above the upper incoming contacts.

[0011] By adopting the above technical solution, the lower and upper outgoing contacts are used to connect with the lower contacts of the handcart circuit breaker.

[0012] Optionally, the lower and upper outgoing terminals are each provided with three sets. The three sets of lower outgoing terminals are fixed between the rear wall of the busbar compartment and the lower cable compartment, and the three sets of upper outgoing terminals are fixed between the rear wall of the busbar compartment and the upper cable compartment. The three sets of lower outgoing contacts are all fixedly connected to the three sets of lower outgoing terminals with lower connecting wires, and the three sets of upper outgoing contacts are all fixedly connected to the three sets of upper outgoing terminals with upper connecting wires.

[0013] By adopting the above technical solution, the lower connecting wire is used to connect the lower outgoing contact and the lower outgoing terminal, the upper connecting wire is used to connect the upper outgoing contact and the upper outgoing terminal, and the lower outgoing terminal and the upper outgoing terminal are respectively used to connect to the outgoing cables in the two sets of lines.

[0014] Optionally, the busbar incoming line group includes a main busbar, a first connecting copper plate, a second connecting copper plate, an upper busbar sub-busbar, a third connecting copper plate, a lower busbar sub-busbar, a fourth connecting copper plate, and a fifth connecting copper plate. Three sets of mounting brackets, upper, middle, and lower, are fixedly connected between the inner walls of the front and rear sides of the busbar compartment. The main busbar, the upper busbar sub-busbar, and the lower busbar sub-busbar are respectively fixed on the upper side of the three sets of mounting brackets.

[0015] By adopting the above technical solution, the busbar incoming line group is used to connect the busbar to the upper incoming line contact and the lower incoming line contact respectively. In conjunction with the handcart circuit breaker, the upper incoming line contact and the upper outgoing line contact are connected, and the lower incoming line contact and the lower outgoing line contact are connected.

[0016] Optionally, three sets of main busbar upper terminals are fixedly connected to both the left and right sides of the upper surface of the main busbar. The lower end of the first wiring copper plate is fixedly connected to the main busbar upper terminal, and the upper end of the first wiring copper plate is fixedly connected to the busbar extension terminal.

[0017] By adopting the above technical solution, the first wiring copper plate is used to connect the main busbar and the busbar expansion terminal, which facilitates the expansion of the incoming line and the cabinet.

[0018] Optionally, the lower surface of the main busbar is fixedly connected with three sets of main busbar lower terminals, the upper surface of the upper busbar sub-busbar is fixedly connected with three sets of first sub-busbar upper terminals, the upper end of the second wiring copper plate is fixedly connected to the main busbar lower terminals, and the lower end of the second wiring copper plate is fixedly connected to the first sub-busbar upper terminals.

[0019] By adopting the above technical solution, the second wiring copper plate is used to connect the main busbar and the upper busbar sub-busbar.

[0020] Optionally, the lower surface of the upper busbar sub-busbar is fixedly connected with three sets of lower sub-busbar terminals, the upper surface of the lower busbar sub-busbar is fixedly connected with three sets of upper second sub-busbar terminals, the upper end of the third wiring copper plate is fixedly connected to the lower sub-busbar terminals, and the lower end of the third wiring copper plate is fixedly connected to the upper second sub-busbar terminals.

[0021] By adopting the above technical solution, the third connecting copper plate is used to connect the upper busbar sub-busbar and the lower busbar sub-busbar. The lower terminal of the sub-busbar and the upper terminal of the second sub-busbar are both offset to the right by a certain distance, so that the third connecting copper plate passes between the two adjacent sets of upper connecting lines and the two adjacent sets of lower connecting lines, thus avoiding interference.

[0022] Optionally, the front surface of the upper busbar sub-branch is fixedly connected with three sets of first sub-branch side terminals, the rear end of the fourth wiring copper plate is fixedly connected to the first sub-branch side terminals, the front end of the fourth wiring copper plate is fixedly connected to the upper incoming contact, the front surface of the lower busbar sub-branch is fixedly connected with three sets of second sub-branch side terminals, the rear end of the fifth wiring copper plate is fixedly connected to the second sub-branch side terminals, and the front end of the fifth wiring copper plate is fixedly connected to the lower incoming contact.

[0023] By adopting the above technical solution, the fourth connecting copper plate is used to connect the upper busbar sub-busbar to the upper incoming contact, and the fifth connecting copper plate is used to connect the lower busbar sub-busbar to the lower incoming contact.

[0024] Optionally, the inner bottom walls of both the lower cable chamber and the upper cable chamber are provided with two sets of cable grooves, and multiple sets of retaining rings are fixedly connected to the inner walls on both the left and right sides of the lower cable chamber and the upper cable chamber.

[0025] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. This invention integrates the internal electrical components of two switch cabinets vertically into the double-layer switch cabinet by appropriately increasing the height of the cabinet, and optimizes the busbar entry path through the busbar entry group. At this time, a single cabinet can realize dual-circuit control, thereby effectively reducing the number of horizontal cabinets and making full use of vertical space, effectively reducing the floor area of ​​the switch cabinet, improving space utilization, and reducing user costs and manufacturer production costs. 2. By placing the lower operator compartment at the bottom and the upper operator compartment in the middle, this invention facilitates the control of the two sets of operator circuit breakers and improves ease of use. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram of the overall internal structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the busbar room of the present invention; Figure 4 This is a schematic diagram of the busbar incoming line group structure of the present invention; Figure 5 This is a schematic diagram of the upper structure of the main busbar of the present invention; Figure 6 This is a schematic diagram of the lower structure of the main busbar of the present invention; Figure 7 This is a schematic diagram of the busbar sub-bar structure of the present invention; Figure 8 This is a schematic diagram of the cable compartment structure of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Switch cabinet; 11. Mounting base; 12. Lower operator's compartment; 13. Upper operator's compartment; 14. Operator circuit breaker; 16. Busbar compartment; 17. Lower cable compartment; 18. Upper cable compartment; 19. Instrument compartment; 110. Busbar extension terminal; 111. Lower outgoing contact; 112. Upper outgoing contact; 113. Lower outgoing terminal; 114. Upper outgoing terminal; 115. Lower connecting wire; 116. Upper connecting wire; 117. Lower incoming contact; 118. Upper incoming contact; 119. Cable tray; 120. Card 1. Ring; 2. Busbar incoming line group; 21. Main busbar; 211. Main busbar upper terminal; 212. Main busbar lower terminal; 22. First terminal copper plate; 23. Second terminal copper plate; 24. Upper busbar sub-busbar; 241. First sub-busbar upper terminal; 242. Sub-busbar lower terminal; 243. First sub-busbar side terminal; 25. Third terminal copper plate; 26. Lower busbar sub-busbar; 261. Second sub-busbar upper terminal; 262. Second sub-busbar side terminal; 27. Fourth terminal copper plate; 28. Fifth terminal copper plate; 29. ​​Mounting bracket. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. Example

[0029] This invention provides, for example Figures 1 to 4 The double-layer medium-voltage switchgear shown includes a switchgear body 1. A mounting base 11 is fixedly connected to the lower end of the switchgear body 1. The switchgear body 1 contains, from front to back, a truck compartment, a busbar compartment 16, and a cable compartment. The truck compartment includes a lower truck compartment 12 and an upper truck compartment 13. Both the lower truck compartment 12 and the upper truck compartment 13 are equipped with truck circuit breakers 14. The cable compartment includes a lower cable compartment 17 and an upper cable compartment 18. An instrument compartment 19 is located on the upper side of the upper truck compartment 13. The busbar compartment 16 contains a busbar incoming line group 2. The side wall of the busbar compartment 16 is equipped with a busbar extension terminal 110, a lower outgoing contact 111, an upper outgoing contact 112, a lower outgoing terminal 113, an upper outgoing terminal 114, a lower incoming contact 117, and an upper incoming contact 118.

[0030] The switch cabinet 1 has dimensions of 800*1800*2300mm, the mounting base 11 has a height of 140mm, the lower handcart compartment 12 has a height of 900mm, the upper handcart compartment 13 has a height of 800mm, and the upper handcart compartment 13 is 1040mm above the ground, which facilitates the control of the handcart circuit breakers 14 inside the two handcart compartments.

[0031] Specifically, the busbar enters the busbar inlet group 2 from the top, and the busbar inlet group 2 connects the busbar to the upper inlet contact 118 and the lower inlet contact 117 respectively. Then, through the upper and lower sets of handcart circuit breakers 14, the upper inlet contact 118 and the upper outlet contact 112 are connected, and the lower inlet contact 117 and the lower outlet contact 111 are connected. At the same time, the outlet cables are connected to the upper outlet terminal 114 and the lower outlet terminal 113 respectively. Example

[0032] See Figure 2 , Figure 3 and Figure 8 The busbar expansion terminal 110 is provided in six sets. The six sets of busbar expansion terminal 110 are fixed on the left and right sides of the upper wall of the busbar compartment 16 respectively. The lower inlet contact 117 and the upper inlet contact 118 are each provided in three sets. The three sets of lower inlet contact 117 are fixed between the front wall of the busbar compartment 16 and the lower handcart compartment 12, and the three sets of upper inlet contact 118 are fixed between the front wall of the busbar compartment 16 and the upper handcart compartment 13.

[0033] Among them, three sets of busbar expansion terminals 110 are fixed on the left and right sides of the upper end of the busbar compartment 16, respectively. The three sets of busbar expansion terminals 110 on the left are used for incoming lines, and the three sets of busbar expansion terminals 110 on the right are used for outgoing lines, which facilitates the expansion of the busbars in the two sets of switch cabinets 1 on the left and right, and thus facilitates the expansion of switch cabinet 1.

[0034] In a preferred embodiment, three sets of lower outgoing contacts 111 and upper outgoing contacts 112 are provided. The three sets of lower outgoing contacts 111 are fixed on the front wall of the busbar chamber 16 above the lower incoming contacts 117, and the three sets of upper outgoing contacts 112 are fixed on the front wall of the busbar chamber 16 above the upper incoming contacts 118. Three sets of lower outgoing terminals 113 and upper outgoing terminals 114 are provided. The three sets of lower outgoing terminals 113 are fixed between the rear wall of the busbar chamber 16 and the lower cable chamber 17, and the three sets of upper outgoing terminals 114 are fixed between the rear wall of the busbar chamber 16 and the upper cable chamber 18. A lower connecting wire 115 is fixedly connected between the three sets of lower outgoing contacts 111 and the three sets of lower outgoing terminals 113, and an upper connecting wire 116 is fixedly connected between the three sets of upper outgoing contacts 112 and the three sets of upper outgoing terminals 114.

[0035] Meanwhile, the upper incoming contact 118 and the upper outgoing contact 112, the lower incoming contact 117 and the lower outgoing contact 111 are all connected through the handcart circuit breaker 14, the lower outgoing contact 111 and the lower outgoing terminal 113 are connected through the lower connecting line 115, and the upper outgoing contact 112 and the upper outgoing terminal 114 are connected through the upper connecting line 116.

[0036] As a preferred embodiment, the inner bottom walls of both the lower cable chamber 17 and the upper cable chamber 18 are provided with two sets of cable grooves 119, and multiple sets of retaining rings 120 are fixedly connected to the inner walls of both the left and right sides of the lower cable chamber 17 and the upper cable chamber 18.

[0037] In addition, the outgoing cables enter the lower cable chamber 17 and the upper cable chamber 18 through the cable tray 119 respectively. Multiple sets of retaining rings 120 fix the outgoing cables entering the upper cable chamber 18. The outgoing cables are connected to the lower outgoing terminal 113 and the upper outgoing terminal 114 respectively to realize the connection of the line. At this time, the power supply to the outgoing cables can be cut off and restored by the handcart circuit breaker 14.

[0038] See Figures 3 to 7The busbar incoming line group 2 includes a main busbar 21, a first connecting copper plate 22, a second connecting copper plate 23, an upper busbar sub-busbar 24, a third connecting copper plate 25, a lower busbar sub-busbar 26, a fourth connecting copper plate 27, and a fifth connecting copper plate 28. Three sets of mounting brackets 29 are fixedly connected between the inner walls of the front and rear sides of the busbar compartment 16. The main busbar 21, the upper busbar sub-busbar 24, and the lower busbar sub-busbar 26 are respectively fixed on the upper side of the three sets of mounting brackets 29. Three sets of main busbar upper terminals 211 are fixedly connected to the left and right sides of the upper surface of the main busbar 21. The lower end of the first connecting copper plate 22 is fixedly connected to the main busbar upper terminal 211, and the upper end of the first connecting copper plate 22 is fixedly connected to the busbar extension terminal 110.

[0039] Among them, the busbar incoming line group 2 is used to connect the busbar to the upper incoming line contact 118 and the lower incoming line contact 117 respectively, and improve the integrity of the internal circuit, avoid interference in the internal circuit, and improve installation efficiency.

[0040] In a preferred embodiment, the lower surface of the main busbar 21 is fixedly connected with three sets of main busbar lower terminals 212, the upper surface of the upper busbar sub-busbar 24 is fixedly connected with three sets of first sub-busbar upper terminals 241, the upper end of the second wiring copper plate 23 is fixedly connected to the main busbar lower terminals 212, the lower end of the second wiring copper plate 23 is fixedly connected to the first sub-busbar upper terminals 241, the lower surface of the upper busbar sub-busbar 24 is fixedly connected with three sets of sub-busbar lower terminals 242, the upper surface of the lower busbar sub-busbar 26 is fixedly connected with three sets of second sub-busbar upper terminals 261, the upper end of the third wiring copper plate 25 is fixedly connected to the sub-busbar lower terminals 242, and the lower end of the third wiring copper plate 25 is fixedly connected to the second sub-busbar upper terminals 261.

[0041] Specifically, during the power supply process, the power enters the main busbar 21 through the left busbar extension terminal 110, the first connecting copper plate 22, and the main busbar 21. Then, it enters the upper busbar sub-busbar 24 through the second connecting copper plate 23, and then enters the lower busbar sub-busbar 26 through the third connecting copper plate 25. The power is split by the two sets of lower busbar sub-busbars 26.

[0042] In a preferred embodiment, the front surface of the upper busbar sub-busbar 24 is fixedly connected to three sets of first sub-busbar side terminals 243, the rear end of the fourth wiring copper plate 27 is fixedly connected to the first sub-busbar side terminals 243, and the front end of the fourth wiring copper plate 27 is fixedly connected to the upper incoming contact 118. The front surface of the lower busbar sub-busbar 26 is fixedly connected to three sets of second sub-busbar side terminals 262, the rear end of the fifth wiring copper plate 28 is fixedly connected to the second sub-busbar side terminals 262, and the front end of the fifth wiring copper plate 28 is fixedly connected to the lower incoming contact 117.

[0043] Meanwhile, the fourth connecting copper plate 27 connects the upper busbar sub-busbar 24 to the upper incoming contact 118. The upper busbar sub-busbar 24 transmits current through the fourth connecting copper plate 27 to the interior of the upper incoming contact 118. Then, the upper handcart circuit breaker 14 connects the upper incoming contact 118 to the upper outgoing contact 112 to realize the power supply of the upper system. The fifth connecting copper plate 28 connects the lower busbar sub-busbar 26 to the lower incoming contact 117. The lower busbar sub-busbar 26 transmits current through the fifth connecting copper plate 28 to the interior of the lower incoming contact 117. Then, the lower handcart circuit breaker 14 connects the lower incoming contact 117 to the lower outgoing contact 111 to realize the power supply of the lower system. The power supply systems on both sides do not interfere with each other, and the overall integrity and ease of use are high.

[0044] In addition, during the assembly of the two sets of switch cabinets 1, a connector is used to connect the right busbar extension terminal 110 at the upper end of the left switch cabinet 1 to the left busbar extension terminal 110 at the upper end of the right switch cabinet 1, thereby realizing the extension connection of the busbar.

[0045] The working principle of this invention is as follows: By appropriately increasing the height of the switch cabinet 1, the internal electrical components of the two sets of switch cabinets 1 are vertically integrated inside the double-layer switch cabinet 1. The busbar incoming path is optimized through the busbar incoming group 2. At this time, a single cabinet can realize dual-circuit control, thereby effectively reducing the number of horizontal cabinets and making full use of the vertical space, effectively reducing the floor area of ​​the switch cabinet 1, improving space utilization, and reducing user operating costs and manufacturer production costs. At the same time, the lower operator compartment 12 is located at the bottom and the upper operator compartment 13 is located in the middle, which facilitates the control of the two sets of handcart circuit breakers 14 and improves the ease of use.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A double-layer medium-voltage switchgear, comprising a switchgear body (1), characterized in that: The lower end of the switch cabinet (1) is fixedly connected to the mounting base (11). The switch cabinet (1) is arranged from front to back with a truck compartment, a busbar compartment (16) and a cable compartment. The truck compartment includes a lower truck compartment (12) and an upper truck compartment (13). Both the lower truck compartment (12) and the upper truck compartment (13) are equipped with truck circuit breakers (14). The cable compartment includes a lower cable compartment (17) and an upper cable compartment (18). An instrument compartment (19) is arranged on the upper side of the upper truck compartment (13). The busbar compartment (16) is equipped with a busbar incoming line group (2). The side wall of the busbar compartment (16) is equipped with a busbar extension terminal (110), a lower outgoing contact (111), an upper outgoing contact (112), a lower outgoing terminal (113), an upper outgoing terminal (114), a lower incoming contact (117), and an upper incoming contact (118).

2. A double-layer medium-voltage switchgear according to claim 1, characterized in that: The busbar expansion terminal (110) is provided in six sets. The six sets of busbar expansion terminal (110) are respectively fixed on the left and right sides of the upper wall of the busbar chamber (16). The lower inlet contact (117) and the upper inlet contact (118) are each provided in three sets. The three sets of lower inlet contacts (117) are fixed between the front wall of the busbar chamber (16) and the lower handcart chamber (12). The three sets of upper inlet contacts (118) are fixed between the front wall of the busbar chamber (16) and the upper handcart chamber (13).

3. A double-layer medium-voltage switchgear according to claim 1, characterized in that: The lower outgoing contact (111) and the upper outgoing contact (112) are each provided in three sets. The three sets of lower outgoing contacts (111) are fixed on the front wall of the busbar chamber (16) above the lower incoming contact (117), and the three sets of upper outgoing contacts (112) are fixed on the front wall of the busbar chamber (16) above the upper incoming contact (118).

4. A double-layer medium-voltage switchgear according to claim 3, characterized in that: The lower outgoing terminal (113) and the upper outgoing terminal (114) are each provided with three sets. The three sets of lower outgoing terminals (113) are fixed between the rear wall of the busbar chamber (16) and the lower cable chamber (17). The three sets of upper outgoing terminals (114) are fixed between the rear wall of the busbar chamber (16) and the upper cable chamber (18). The three sets of lower outgoing contacts (111) and the three sets of lower outgoing terminals (113) are all fixedly connected with a lower connecting wire (115). The three sets of upper outgoing contacts (112) and the three sets of upper outgoing terminals (114) are all fixedly connected with an upper connecting wire (116).

5. A double-layer medium-voltage switchgear according to claim 1, characterized in that: The busbar incoming line group (2) includes a main busbar (21), a first connecting copper plate (22), a second connecting copper plate (23), an upper busbar sub-busbar (24), a third connecting copper plate (25), a lower busbar sub-busbar (26), a fourth connecting copper plate (27), and a fifth connecting copper plate (28). The upper, middle, and lower sets of mounting brackets (29) are fixedly connected between the inner walls of the front and rear sides of the busbar chamber (16). The main busbar (21), the upper busbar sub-busbar (24), and the lower busbar sub-busbar (26) are respectively fixed on the upper side of the upper, middle, and lower sets of mounting brackets (29).

6. A double-layer medium-voltage switchgear according to claim 5, characterized in that: Three sets of main busbar upper terminals (211) are fixedly connected to the left and right sides of the upper surface of the main busbar (21). The lower end of the first wiring copper plate (22) is fixedly connected to the main busbar upper terminal (211), and the upper end of the first wiring copper plate (22) is fixedly connected to the busbar extension terminal (110).

7. A double-layer medium-voltage switchgear according to claim 6, characterized in that: The lower surface of the main busbar (21) is fixedly connected with three sets of main busbar lower terminals (212), the upper surface of the upper busbar sub-busbar (24) is fixedly connected with three sets of first sub-busbar upper terminals (241), the upper end of the second wiring copper plate (23) is fixedly connected to the main busbar lower terminal (212), and the lower end of the second wiring copper plate (23) is fixedly connected to the first sub-busbar upper terminal (241).

8. A double-layer medium-voltage switchgear according to claim 7, characterized in that: The lower surface of the upper busbar sub-busbar (24) is fixedly connected with three sets of sub-busbar lower terminals (242), the upper surface of the lower busbar sub-busbar (26) is fixedly connected with three sets of second sub-busbar upper terminals (261), the upper end of the third wiring copper plate (25) is fixedly connected to the sub-busbar lower terminals (242), and the lower end of the third wiring copper plate (25) is fixedly connected to the second sub-busbar upper terminals (261).

9. A double-layer medium-voltage switchgear according to claim 8, characterized in that: The front surface of the upper busbar sub-busbar (24) is fixedly connected with three sets of first sub-busbar side terminals (243). The rear end of the fourth wiring copper plate (27) is fixedly connected to the first sub-busbar side terminals (243). The front end of the fourth wiring copper plate (27) is fixedly connected to the upper incoming contact (118). The front surface of the lower busbar sub-busbar (26) is fixedly connected with three sets of second sub-busbar side terminals (262). The rear end of the fifth wiring copper plate (28) is fixedly connected to the second sub-busbar side terminals (262). The front end of the fifth wiring copper plate (28) is fixedly connected to the lower incoming contact (117).

10. A double-layer medium-voltage switchgear according to claim 1, characterized in that: The bottom walls of the lower cable chamber (17) and the upper cable chamber (18) are provided with two sets of cable grooves (119) in the front and rear. The inner walls of the left and right sides of the lower cable chamber (17) and the upper cable chamber (18) are fixedly connected with multiple sets of retaining rings (120).

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