12kV alternating current switch cabinet based on composite primary component and comprehensive secondary component

Abstract

The invention relates to a 12kV alternating-current switch cabinet based on a composite primary component and a comprehensive secondary component, relates to the technical field of power distribution and utilization of a power system, and aims to solve the problem that an existing switch cabinet is complex in overall structure. The switch cabinet shell is divided into an instrument chamber, a circuit breaker chamber, a bus chamber, a cable chamber and a vacant chamber; a three-phase bus bar is arranged in the bus chamber, an incoming line contact box is arranged on a partition plate between the circuit breaker chamber and the bus chamber, an incoming line contact is arranged in the incoming line contact box, an incoming line copper bar is arranged between the three-phase bus bar and the incoming line contact of the incoming line contact box, and a grounding knife switch is arranged in the cable chamber. An outgoing line contact box is arranged on the partition plate between the circuit breaker chamber and the cable chamber, the outgoing line contact box is provided with an outgoing line contact, and an outgoing line copper bar is arranged between the grounding knife switch and the outgoing line contact of the outgoing line contact box. The overall structure is simplified, and the miniaturization design of the switch cabinet is realized.

Description

Technical Field

[0001] This application relates to the field of power system distribution technology, and in particular to a 12kV AC switchgear based on composite primary components and integrated secondary components. Background Technology

[0002] 12kV AC switchgear is used for the connection and isolation of the 12kV power grid in the power distribution system. It is a key basic equipment for the safe and economical operation of the power grid. It is the most widely used type of high-voltage switchgear, directly affecting thousands of households and related to social stability, corporate profits and people's quality of life.

[0003] The 12kV AC switchgear is equipped with a primary high-voltage, high-current 12kV AC circuit breaker, 12kV current transformer and other components, as well as secondary low-voltage, low-current integrated protection and control devices, main wiring simulation devices and other components, all housed in a single cabinet.

[0004] The existing 12kV AC switchgear has many internal components, including a large number of primary and secondary components. This results in an excessive number of primary connection copper busbars, secondary connection cables, and connection points. This situation makes the overall structure of the switchgear complex, increases the difficulty of manufacturing processes, reduces operational reliability, and makes maintenance work difficult. Consequently, production and maintenance costs remain high, and it is also not conducive to the miniaturization design of the switchgear. Therefore, improvements are needed. Summary of the Invention

[0005] To address the problems of complex overall structure in existing switchgear, this application provides a 12kV AC switchgear based on composite primary components and integrated secondary components.

[0006] The 12kV AC switchgear based on composite primary components and integrated secondary components provided in this application adopts the following technical solution: A 12kV AC switchgear based on composite primary components and integrated secondary components includes a switchgear housing. The housing is provided with partitions for separation, and the switchgear housing is divided by the partitions into an instrument compartment, a circuit breaker compartment, a busbar compartment, a cable compartment, and an unused compartment. A three-phase busbar is provided in the busbar compartment. An incoming contact box is provided on the partition between the circuit breaker compartment and the busbar compartment. The incoming contact box is provided with incoming contacts. An incoming copper busbar is provided between the three-phase busbar and the incoming contacts of the incoming contact box. A grounding switch is provided in the cable compartment. An outgoing contact box is provided on the partition between the circuit breaker compartment and the cable compartment. The outgoing contact box is provided with outgoing contacts. An outgoing copper busbar is provided between the grounding switch and the outgoing contacts of the outgoing contact box. The circuit breaker compartment is equipped with a circuit breaker, whose three-phase incoming and three-phase outgoing terminals are respectively connected to the incoming and outgoing contacts; the instrument compartment cabinet door is fitted with an integrated device, and the instrument compartment is equipped with a secondary terminal block; the circuit breaker is equipped with a secondary connector, and the partition between the circuit breaker compartment and the instrument compartment is equipped with a secondary socket that mates with the secondary connector, and the secondary socket is connected to the secondary terminal block; the integrated device is equipped with a secondary plug-in component, and the secondary plug-in component is connected to the secondary terminal block.

[0007] The existing 12kV AC switchgear has many internal components, including numerous primary and secondary components, resulting in an excessive number of primary connection copper busbars, secondary connection cables, and connection points. This situation complicates the overall structure of the switchgear, increases the difficulty of manufacturing processes, reduces operational reliability, and makes maintenance difficult, leading to high production and maintenance costs. It also hinders the miniaturization of the switchgear design. By adopting the above technical solution, including the switchgear housing, the partitions form an instrument room, circuit breaker room, busbar room, cable room, and unused room. The three-phase busbars are installed in the busbar room, the incoming contact box is installed on the partition between the circuit breaker room and the busbar room, and an incoming copper busbar is installed between the three-phase busbars and the incoming contacts of the incoming contact box. The grounding switch is installed in the cable room, and an outgoing copper busbar is installed between the grounding switch and the outgoing contacts of the outgoing contact box. The switchgear enclosure is rationally divided into an instrument room, circuit breaker room, busbar room, cable room, and unused room. A three-phase busbar is installed in the busbar room. The circuit breaker room, busbar room, and cable room are connected by copper busbars, with inlet and outlet contact boxes and corresponding contacts on the partitions. The circuit breaker room houses the circuit breaker, whose inlet and outlet terminals connect to the contacts. The instrument room cabinet door houses a comprehensive device, and the room contains secondary terminal blocks. The circuit breaker has secondary connectors that connect to secondary sockets on the partitions, which in turn connect to the secondary terminal blocks. The comprehensive device is connected to the secondary terminal blocks via secondary plug-in components. The clear division of functional areas within the switchgear facilitates the categorized installation and maintenance of different components. This design simplifies the structure of the busbar and cable rooms, significantly reducing connection points and wiring, simplifying the overall structure, lowering manufacturing complexity, improving operational reliability, facilitating maintenance, effectively reducing production costs, and enabling miniaturized switchgear design.

[0008] Optionally, the switch cabinet housing is provided with instrument room door, circuit breaker room door, busbar room door, cable room door and vacant room door respectively; the left and right sides of the switch cabinet housing are respectively provided with left side panel and right side panel.

[0009] By adopting the above technical solution, instrument compartment doors, circuit breaker compartment doors, busbar compartment doors, cable compartment doors, and vacant compartment doors are installed on the switchgear housing, and left and right side panels are installed on the left and right sides of the switchgear housing. The installation of instrument compartment doors, circuit breaker compartment doors, busbar compartment doors, cable compartment doors, vacant compartment doors, left and right side panels effectively improves the overall sealing of the switchgear, effectively preventing external dust and moisture from entering the cabinet, ensuring that internal electrical components operate in a stable environment, and extending the service life of the switchgear.

[0010] Optionally, the circuit breaker is a composite current sampling circuit breaker, which includes a general-purpose circuit breaker and at least two current transformers; the general-purpose circuit breaker includes a circuit breaker body and three poles; the current transformers are mounted on the outside of the corresponding poles and are located in the middle of the arc-extinguishing chamber of the pole.

[0011] By adopting the above technical solution, the composite current sampling circuit breaker includes a general-purpose circuit breaker and at least two current transformers. The composite current sampling circuit breaker enables the current transformers to sample the current directly at the circuit breaker poles, eliminating the need for additional independent current transformers and corresponding primary connection copper busbars and secondary connection cables. This simplifies the internal structure of the switch cabinet and reduces the number of connection points and connecting lines.

[0012] Optionally, the composite current sampling circuit breaker is provided with three primary input sockets and three primary output sockets; the primary input sockets are connected to the input contacts, and the primary output sockets are connected to the output contacts.

[0013] By adopting the above technical solution, the composite current sampling circuit breaker is equipped with three primary incoming line sockets and three primary outgoing line sockets. Through the setting of the incoming and outgoing line sockets, the primary incoming line sockets can be connected to the incoming contacts, and the primary outgoing line sockets can be connected to the outgoing contacts, simplifying the current transmission path, eliminating the traditional complex connection structure, reducing the use of a large number of connecting cables and connection points, making the internal layout of the switch cabinet compact and reasonable, and reducing space occupation.

[0014] Optionally, the current transformer includes a housing, a toroidal core, and a coil, the coil being wound on the toroidal core, and the coil and the toroidal core being located inside the housing; the general-purpose circuit breaker body has an L-shaped rear plate, and a fixing plate is fixedly arranged below the housing of the current transformer, the fixing plate being connected to the vertical surface of the L-shaped rear plate.

[0015] By adopting the above technical solution, the current transformer includes a shell, a toroidal iron core, and a coil. Through the arrangement of the current transformer, the current transformer is composed of a shell, a toroidal iron core, and a coil wound on the iron core. At the same time, the L-shaped rear plate is connected to the fixing plate below the current transformer shell, so that the current transformer is stably installed in the middle part of the arc-extinguishing chamber outside the circuit breaker pole. This ensures that the current transformer can accurately collect current signals, while the integrated installation reduces additional installation space.

[0016] Optionally, the housing is provided with a coil lead-out hole; the lead wire of the coil passes through the coil lead-out hole and is connected to the secondary connector via a cable.

[0017] By adopting the above technical solution, the coil lead hole is opened on the outer shell, and the coil lead wire passes through the coil lead hole and is connected to the secondary connector via cable; the setting of the coil lead hole allows the coil lead wire wound on the annular iron core to pass through smoothly, thus standardizing the wiring structure inside the switch cabinet.

[0018] Optionally, the integrated device includes a housing, the interior of which is divided into a left chamber, a middle chamber, a right chamber, and a rear chamber; the left chamber is provided with multiple functional pressure plates, the middle chamber is provided with an LCD screen, and the right chamber is provided with multiple operating switches; the rear chamber is provided with a rear chamber circuit board and a rear cover plate; the rear chamber circuit board has an outer side and an inner side.

[0019] By adopting the above technical solution, the integrated device includes a housing, the interior of which is divided into a left chamber, a middle chamber, a right chamber, and a rear chamber. Through the design of the internal structure of the housing, the rational structural division and multiple functional pressure plates meet different operating scenarios and protection requirements. The LCD screen can intuitively display various operating parameters, status information, and alarm prompts of the switchgear. Multiple operating switches facilitate operation by maintenance personnel to control the switchgear.

[0020] Optionally, the secondary plug-in component is installed on the outer side of the rear chamber circuit board, and a plug-in hole for the secondary plug-in component to pass through is provided at a corresponding position on the rear cover plate; the inner side of the rear chamber circuit board is provided with electronic components that realize comprehensive protection and control functions.

[0021] By adopting the above technical solution, the rear chamber circuit board and rear cover plate ensure a reliable connection between the secondary plug-in component and external equipment.

[0022] Optionally, the outer surface of the rear chamber circuit board corresponds to the areas of the left chamber, middle chamber, and right chamber. A current sampling input secondary plug-in is provided in the area of ​​the left chamber. A circuit breaker opening / closing status and energy storage status signal input secondary plug-in is provided in the area of ​​the middle chamber. A secondary plug-in for communication of various forms of external devices and a secondary input plug-in for connecting the output contacts of external protection devices are provided in the area of ​​the middle chamber. A circuit breaker control output secondary plug-in for circuit breaker opening / closing and energy storage, and a secondary plug-in for controlling the output of external fans and dehumidifiers are provided in the area of ​​the right chamber.

[0023] By adopting the above technical solution, the outer surface of the rear chamber circuit board corresponds to the areas of the left, middle, and right chambers. A current sampling input secondary plug-in component is installed in the left chamber area; a circuit breaker opening / closing status and energy storage status signal input secondary plug-in component, various communication secondary plug-in components for external devices, and secondary input plug-in components connecting the output contacts of external protection devices are installed in the middle chamber area; and a circuit breaker control output secondary plug-in component for circuit breaker opening / closing and energy storage, as well as a secondary plug-in component for controlling the outputs of external fans and dehumidifiers, are installed in the right chamber area. Through the installation of the plug-in components on the rear chamber circuit board, the current sampling input secondary plug-in component can collect electrical signals. The secondary plug-in components for inputting current signals, circuit breaker opening / closing status signals, and energy storage status signals; secondary plug-in components for various forms of communication with external devices; and secondary input plug-in components for connecting output contacts of external protection devices can comprehensively acquire circuit breaker status information and achieve diversified communication with external devices. The secondary plug-in components for circuit breaker control outputs for opening / closing and energy storage, as well as secondary plug-in components for controlling external fans and dehumidifiers, can effectively control the circuit breaker and simultaneously achieve intelligent regulation of external fans and dehumidifiers, ensuring a suitable internal environment for the switchgear. This highly integrates the functions of the integrated device and improves the automation level of the switchgear.

[0024] Optionally, the current sampling input secondary plug-in component, the circuit breaker opening / closing status and energy storage status signal input secondary plug-in component, and the circuit breaker control output secondary plug-in component for circuit breaker opening / closing and energy storage are electrically connected to the secondary socket through a secondary terminal block.

[0025] By adopting the above technical solution, the secondary plug-in component for current sampling input, the secondary plug-in component for circuit breaker opening / closing status and energy storage status signal input, and the secondary plug-in component for circuit breaker control output for circuit breaker opening / closing and energy storage are electrically connected to the secondary socket through the secondary terminal block. By connecting the secondary plug-in component for current sampling input to the secondary socket, the secondary plug-in component for current sampling input can stably transmit the collected current signal to the secondary socket, providing data for subsequent monitoring and protection devices.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By designing the switchgear, the enclosure is rationally divided into an instrument room, circuit breaker room, busbar room, cable room, and unused room. A three-phase busbar is installed in the busbar room. The circuit breaker room, busbar room, and cable room are connected by copper busbars, with inlet and outlet contact boxes and corresponding contacts on the partitions. The circuit breaker room houses the circuit breaker, whose inlet and outlet terminals are connected to the contacts. The instrument room cabinet door is fitted with an integrated device, and the room contains secondary terminal blocks. The circuit breaker has secondary connectors that connect to secondary sockets on the partitions, which in turn connect to the secondary terminal blocks. The integrated device is connected to the secondary terminal blocks via secondary plug-in components. The clear division of functional areas within the switchgear facilitates the categorized installation and maintenance of different components. This design simplifies the structure of the busbar and cable rooms, significantly reduces connection points and wiring, simplifies the overall structure, reduces manufacturing complexity, improves operational reliability, facilitates maintenance, effectively reduces production costs, and also facilitates the miniaturization of the switchgear. 2. By setting up instrument room doors, circuit breaker room doors, busbar room doors, cable room doors and vacant room doors, as well as left and right side panels of the cabinet, the overall sealing of the switchgear is effectively improved, which can effectively prevent external dust, moisture and other substances from entering the cabinet, ensure that the internal electrical components operate in a stable environment, and extend the service life of the switchgear. 3. By setting up a composite current sampling circuit breaker, the current transformer can directly sample the current at the circuit breaker pole, eliminating the need for an additional independent current transformer and corresponding primary connection copper busbar and secondary connection cable, thus simplifying the internal structure of the switch cabinet and reducing the number of connection points and connecting lines. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a 12kV AC switchgear based on composite primary components and integrated secondary components in an embodiment of this application.

[0028] Figure 2 This is a schematic diagram illustrating the structure of the composite current sampling circuit breaker in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram illustrating the structure of a current transformer in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram illustrating the structure of the integrated device in the embodiments of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Switchgear housing; 2. Partition; 3. Instrument compartment; 4. Circuit breaker compartment; 5. Busbar compartment; 6. Cable compartment; 7. Vacant compartment; 8. Instrument compartment door; 9. Circuit breaker compartment door; 10. Busbar compartment door; 11. Cable compartment door; 12. Vacant compartment door; 13. Left side panel of the cabinet; 14. Right side panel of the cabinet; 15. Busbar; 16. Incoming contact box; 17. Incoming contact; 18. Incoming copper busbar; 19. Outgoing contact box; 20. Outgoing contact; 21. Grounding switch; 22. Cable; 23. Outgoing copper busbar; 24. Switch incoming connector; 25. Cable connector; 1001. Composite current sampling circuit breaker; 1002, Primary input socket; 1003, Secondary connector; 1004, Secondary socket; 1005, Circuit breaker; 1006, Current transformer; 1007, Circuit breaker body; 1008, Pole post; 1009, L-shaped back plate; 1011, Arc extinguishing chamber; 1012, Circular core; 1013, Coil; 1014, Housing; 1015, Mounting hole; 1016, Fixing screw; 1017, Positioning boss; 1018, Positioning hole; 1019, Fixing plate; 1020, Fixing screw hole; 1021, Coil lead-out hole ; 1022. Primary outgoing line socket; 1023. Mounting hole for mounting plate; 1024. Mounting screw for mounting plate; 1025. Mounting screw hole for mounting plate; 2001. Integrated device; 2002. Secondary plug-in component; 2003. Secondary terminal block; 2100. Left chamber; 2200. Middle chamber; 2300. Right chamber; 2400. Rear chamber; 2101. Holding engagement / disengagement pressure plate; 2102. Reclosing engagement / disengagement pressure plate; 2103. Control output pressure plate; 2104. Maintenance status pressure plate; 2201. LCD screen; 2301. Integrated operating switch; 2302. Energy storage operating switch ; 2303, Dehumidifier operating switch; 2304, Fan operating switch; 2401, Rear chamber circuit board; 2402, Outer side; 2403, Inner side; 2404, Current sampling input secondary plug-in component; 2405, Opening / closing status and energy storage status signal input secondary plug-in component; 2406, External device communication secondary plug-in component; 2407, Output contact connection secondary plug-in component; 2408, Circuit breaker control output secondary plug-in component; 2409, External fan and heater control output secondary plug-in component; 2410, Rear cover plate; 2411, Plug-in hole; 2412, Electronic components. Detailed Implementation

[0032] To illustrate in detail the technical solutions adopted by the present invention to achieve the intended technical objectives, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Furthermore, the technical means or technical features in the embodiments of the present invention can be replaced without creative effort. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] This application discloses a 12kV AC switchgear based on composite primary components and integrated secondary components. (Refer to...) Figure 1 Based on composite primary components and integrated secondary components, the 12kV system is described as follows: composite refers to the combination of various parts to form a new whole, and integrated refers to the reconstruction of various parts into a new whole at a higher level. The system includes a switch cabinet housing 1, on which partitions 2 are installed. In this embodiment, there are multiple partitions 2. The multiple partitions 2 divide the interior of the switch cabinet housing 1 into an instrument room 3, a circuit breaker room 4, a busbar room 5, a cable room 6, and an empty room 7. The functional areas of the switch cabinet are clearly defined, which facilitates the classification, installation, inspection, and maintenance of different components.

[0035] Reference Figure 1 The switchgear housing 1 is equipped with instrument compartment doors 8, circuit breaker compartment doors 9, busbar compartment doors 10, cable compartment doors 11, and vacant compartment doors 12, corresponding to instrument compartment 3, circuit breaker compartment 4, busbar compartment 5, cable compartment 6, and vacant compartment 7, respectively. At the same time, the left side panel 13 and the right side panel 14 are installed on the left and right sides of the switchgear housing 1, respectively. This effectively improves the overall sealing of the switchgear, effectively prevents external dust and moisture from entering the cabinet, ensures that the internal electrical components operate in a stable environment, and extends the service life of the switchgear.

[0036] Reference Figure 1 The upper part of the busbar compartment 5 is equipped with a three-phase busbar 15, which is composed of horizontally arranged A-phase, B-phase, and C-phase copper busbars. The partition 2 between the circuit breaker compartment 4 and the busbar compartment 5 is equipped with an incoming contact box 16. The three incoming contact boxes 16 are for A-phase, B-phase, and C-phase respectively. The incoming contact boxes 16 are equipped with incoming contacts 17. Three incoming copper busbars 18 are arranged between the three-phase busbar 15 and the incoming contacts 17 of the incoming contact boxes 16. One end of the incoming copper busbar 18 is connected to the A-phase, B-phase, and C-phase busbar 15, and the other end is connected to the A-phase, B-phase, and C-phase incoming contacts 17.

[0037] Reference Figure 1On the partition 2 between the circuit breaker compartment 4 and the cable compartment 6, there are outgoing contact boxes 19 for phases A, B, and C, respectively. The three outgoing contact boxes 19 contain outgoing contacts 20. The cable compartment 6 is equipped with a grounding switch 21 and a cable 22. A copper busbar 23 is arranged between the grounding switch 21 and the outgoing contacts 20 of the outgoing contact box 19. One end of the copper busbar 23 is connected to the outgoing contact 20, and the other end is connected to the inlet connector of the grounding switch 21. The outgoing end of the grounding switch 21 is connected to the cable connector of the cable 22. In this embodiment, the two or three 12kV current transformers and their primary connecting copper busbars and secondary connecting cables, which are not commonly used in the busbar compartment 5 or the cable compartment 6, are greatly simplified and the cost is reduced.

[0038] Reference Figure 1 The instrument room 3 has an integrated device 2001 embedded in its cabinet door. A secondary terminal block 2003 is also installed inside the instrument room 3. A secondary connector 1003 is installed on the circuit breaker 1005. A secondary socket 1004, which mates with the secondary connector 1003, is installed on the partition 2 between the circuit breaker compartment 4 and the instrument room 3. A cable connects the secondary socket 1004 to the secondary terminal block 2003. A secondary plug-in component 2002 is installed on the integrated device 2001, and a cable connects the secondary plug-in component 2002 to the secondary terminal block 2003. In this embodiment, the instrument room 3 contains only the secondary terminal block 2003, and the instrument room door 8 contains only the integrated device 2001. The structure is extremely simple, and the number of connection points and cables is greatly reduced. Therefore, production, debugging, and maintenance are easy, and costs are reduced.

[0039] Reference Figure 1 and Figure 2 A circuit breaker 1005 is installed in the circuit breaker compartment 4. The circuit breaker 1005 is a composite current sampling circuit breaker 1001. The composite current sampling circuit breaker 1001 has three primary incoming line sockets 1002 and three primary outgoing line sockets 1022, which correspond to phase A, phase B and phase C respectively. The primary incoming line sockets 1002 are connected to the incoming contact 17, and the primary outgoing line sockets 1022 are connected to the outgoing contact 20.

[0040] Reference Figure 1 and Figure 2The composite current sampling circuit breaker 1001 includes a general-purpose circuit breaker 1005 and at least two current transformers 1006. In this embodiment, the number of current transformers 1006 can be two or three. The general-purpose circuit breaker 1005 includes a circuit breaker body and three poles 1008. The general-purpose circuit breaker body has an L-shaped back plate 1009. The three poles 1008 of phase A, phase B, and phase C are fixed on the horizontal surface of the L-shaped back plate 1009. In this embodiment, the poles 1008 have arc-extinguishing chambers 1011.

[0041] Reference Figure 1 , Figure 2 and Figure 3 Meanwhile, the current transformer 1006 is annular and horizontally mounted outside the pole 1008, corresponding to the middle part of the arc-extinguishing chamber 1011. The current transformer 1006 includes a housing 1014, an annular iron core 1012, and a coil 1013. The coil 1013 is wound on the annular iron core. The coil 1013 and the annular iron core are located inside the housing 1014. The housing 1014 is cast from insulating materials such as epoxy. In this embodiment, the inner diameter of the housing 1014 of the current transformer 1006 is greater than 100mm, the outer diameter is less than 210mm, and the height is less than 50mm. The wire diameter of the coil 1013 is greater than 0.1mm, and the number of turns is greater than 1000 turns.

[0042] Reference Figure 1 , Figure 2 and Figure 3 A fixing plate 1019 is fixedly arranged below the housing 1014 of the current transformer 1006. The fixing plate 1019 is detachably connected to the vertical surface of the L-shaped back plate 1009. A positioning boss 1017 is formed on the housing 1014. At the same time, a positioning hole 1018 is provided on the vertical surface of the L-shaped back plate 1009 corresponding to the positioning boss 1017, so as to realize the positioning between the housing 1014 and the L-shaped back plate 1009. The housing 1014 is provided with mounting holes 1015, and there are no less than two mounting holes 1015. Fixing screws 1016 are arranged in the mounting holes 1015. The fixing plate 1019 is provided with fixing screw holes 1020 corresponding to the fixing screws 1016, so as to realize the fixing between the housing 1014 and the fixing plate 1019.

[0043] Reference Figure 1 , Figure 2 and Figure 3Meanwhile, the fixing plate 1019 is also provided with fixing plate fixing holes 1023, and there are no less than two fixing plate fixing holes 1023. Fixing plate fixing screws 1024 are arranged in the fixing plate fixing holes 1023. The vertical surface of the L-shaped back plate 1009 has fixing plate fixing screw holes 1025 corresponding to the fixing plate fixing holes 1023, so as to realize the fixing between the fixing plate 1019 and the L-shaped back plate 1009. The L-shaped back plate 1009 is connected to the fixing plate 1019 below the housing 1014 of the current transformer 1006, so that the current transformer 1006 is stably installed in the middle part of the arc extinguishing chamber 1011 outside the pole 1008 of the circuit breaker 1005, ensuring that the current transformer 1006 can accurately collect current signals, while the integrated installation reduces additional installation space.

[0044] Reference Figure 1 and Figure 3 The outer casing 1014 has a coil lead-out hole 1021. The lead wire of the coil 1013 passes through the coil lead-out hole 1021. One end of the cable passes through the vertical surface of the L-shaped back plate 1009 of the circuit breaker 1005 and connects to the secondary connector 1003. The other end of the cable is connected to the coil 1013 terminal or passes through the coil lead-out hole 1021 and connects to the lead end of the coil 1013. This allows the lead wire of the coil 1013 wound on the annular iron core 1012 to pass through smoothly, standardizing the wiring structure inside the switch cabinet.

[0045] Reference Figure 1 and Figure 4 The integrated device 2001 includes a housing made of plastic. The housing is internally divided into a left chamber 2100, a middle chamber 2200, a right chamber 2300, and a rear chamber 2400. The left chamber 2100 contains various functional pressure plates, including a human-machine interface device (HMI) protection switch 2101 (used less frequently), a reclosing switch 2102, a control output switch 2103, and a maintenance status switch 2104. The middle chamber 2200 contains an LCD screen 2201, which has a large area, color display, backlight, and touch-sensitive functionality. The right chamber 2300 contains various operating switches, including frequently used HMI switches. The integrated circuit breaker operating switch 2301 allows for local and remote switching, as well as opening and closing operations. Other features include the circuit breaker energy storage operating switch 2302, the cabinet dehumidifier or heater operating switch 2303, and the cabinet fan operating switch 2304. The system features a rational structural layout with multiple functional pressure plates to meet different operating scenarios and protection requirements. The LCD screen 2201 can intuitively display various operating parameters, status information, and alarm prompts of the switchgear. Multiple operating switches facilitate operation by maintenance personnel, enabling control of the switchgear. The rear chamber 2400 circuit board and rear cover 2410 ensure reliable connection between the secondary plug-in component 2002 and external equipment.

[0046] Reference Figure 1 and Figure 4The rear chamber 2400 contains a rear chamber circuit board 2401 and a rear cover plate 2410. The rear chamber circuit board 2401 covers the left chamber 2100, the middle chamber 2200 and the right chamber 2300. The rear chamber circuit board 2401 has an outer side 2402 and an inner side 2403. The rear cover plate 2410 has a corresponding insertion hole 2411 for the secondary insertion component 2002 to pass through. The inner side 2403 of the rear chamber circuit board 2401 is arranged with electronic components 2412 that realize comprehensive protection and control functions.

[0047] Reference Figure 1 and Figure 4 The outer side 2402 of the rear chamber circuit board 2401 corresponds to the areas of the left chamber 2100, the middle chamber 2200, and the right chamber 2300. The area corresponding to the left chamber 2100 is equipped with a current sampling input secondary plug-in component 2404. The area corresponding to the middle chamber 2200 is equipped with a circuit breaker opening and closing status and energy storage status signal input secondary plug-in component 2405, a secondary plug-in component 2406 for various forms of communication with external devices, and a secondary input plug-in component 2407 for connecting the output contacts of external protection devices. The area corresponding to the right chamber 2300 is equipped with a circuit breaker opening and closing and energy storage control output secondary plug-in component 2408, and a secondary plug-in component 2409 for controlling the output of external fans and dehumidifiers.

[0048] Reference Figure 1 and Figure 4 The circuit breaker opening / closing status and energy storage status signal input secondary plug-in component 2405 and the circuit breaker control output secondary plug-in component 2408 for circuit breaker opening / closing status and energy storage are connected to the secondary socket 1004 via secondary terminal block 2003 using cables. The external device communication secondary plug-in component 2406, the output contact connection secondary input plug-in component 2407, and the external fan and dehumidifier or heater control output secondary plug-in component 2409 are connected to the corresponding external device via secondary terminal block 2003 or directly using cables.

[0049] Reference Figure 1 In this embodiment, the circuit breaker 1005 samples by using a composite current sampling circuit breaker 1001 as the sampling element. The current sampling input secondary plug-in component 2404 is connected to the secondary socket 1004 via a cable through the secondary terminal block 2003, thereby obtaining the current signal from the composite current sampling circuit breaker 1001.

[0050] The implementation principle of a 12kV AC switchgear based on composite primary components and integrated secondary components in this application embodiment is as follows: In the primary current transmission process, the current starts from the three-phase busbar 15 in the busbar compartment 5, flows along the incoming copper busbar 18 to the incoming contact 17 of the incoming contact box 16 installed on the partition 2 between the circuit breaker compartment 4 and the busbar compartment 5, and then the current enters the composite current sampling circuit breaker 1001. The circuit breaker 1005 consists of a general circuit breaker 1005 and at least two current transformers 1006 that are mounted outside the pole 1008 and located in the middle of the arc extinguishing chamber 1011. After being processed by the general circuit breaker 1005, the current flows out from the three-phase outgoing terminal through the outgoing contact 20 and the outgoing copper busbar 23 of the outgoing contact box 19, and is finally transmitted to the cable compartment 6, completing the transmission path of the primary current in the switchgear; In terms of secondary signal acquisition and transmission, the current transformer 1006 in the composite current sampling circuit breaker 1001 has its coil 1013 lead wire connected to the secondary connector 1003 via a cable. Then, through the insertion with the secondary connector 1004 on the partition 2 of the circuit breaker compartment 4 and the instrument compartment 3, and the secondary terminal block 2003, the signal is transmitted to the integrated device 2001 embedded on the cabinet door of the instrument compartment 3. In addition, the opening and closing status, energy storage status, and other signals of the circuit breaker 1005, as well as the communication signals of external equipment and the output signals of external protection devices, are all transmitted to the integrated device 2001 through the corresponding secondary plug-in parts 2002 and the secondary terminal block 2003. After receiving various signals, the integrated device 2001 processes and analyzes the signals through its internal electronic components 2412. Based on the analysis results, it outputs control commands through the corresponding secondary plug-in components 2002. For example, it controls the circuit breaker 1005 to trip when the current is abnormal, and starts the dehumidifier when the humidity inside the cabinet is too high. At the same time, the LCD screen 2201 can intuitively display various operating parameters, status information and alarm information. The operation switch facilitates manual operation by maintenance personnel, and the operation results are also fed back to the integrated device 2001 for processing and display. The switchgear enclosure is rationally divided into an instrument room 3, a circuit breaker room 4, a busbar room 5, a cable room 6, and an unused room 7. A three-phase busbar 15 is installed in the busbar room 5. The partitions 2 connecting the circuit breaker room 4, busbar room 5, and cable room 6 are respectively equipped with inlet and outlet contact boxes 19 and corresponding contacts, connected by inlet and outlet copper busbars 23. A circuit breaker 1005 is installed in the circuit breaker room 4, with its inlet and outlet terminals connected to the contacts. An integrated device 2001 is embedded in the door of the instrument room 3. A secondary terminal block 2003 is installed inside the room, and the circuit breaker 1005 is equipped with a secondary connector 100. 3 is connected to the secondary socket 1004 on the partition 2 and then connected to the secondary terminal block 2003. The integrated device 2001 is connected to the secondary terminal block 2003 through the secondary plug-in component 2002. The functional areas of the switch cabinet are clearly divided, which facilitates the classification, installation and maintenance of different components. This design simplifies the structure of the busbar compartment 5 and the cable compartment 6, greatly reduces the number of connection points and connecting lines, simplifies the overall structure, reduces the difficulty of manufacturing process, improves operational reliability, facilitates operation and maintenance, effectively reduces production costs, and at the same time helps to realize the miniaturization design of the switch cabinet.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A 12kV AC switchgear based on composite primary components and integrated secondary components, characterized in that: The system includes a switchgear housing, which is equipped with partitions for separation. The switchgear housing is divided by the partitions into an instrument compartment, a circuit breaker compartment, a busbar compartment, a cable compartment, and an unused compartment. The busbar compartment is equipped with a three-phase busbar. An incoming contact box is installed on the partition between the circuit breaker compartment and the busbar compartment. The incoming contact box is equipped with incoming contacts. An incoming copper busbar is installed between the three-phase busbar and the incoming contacts of the incoming contact box. The cable compartment is equipped with a grounding switch. An outgoing contact box is installed on the partition between the circuit breaker compartment and the cable compartment. The outgoing contact box is equipped with outgoing contacts. An outgoing copper busbar is installed between the grounding switch and the outgoing contacts of the outgoing contact box. The circuit breaker compartment is equipped with a circuit breaker, whose three-phase incoming and three-phase outgoing terminals are respectively connected to the incoming and outgoing contacts; the instrument compartment cabinet door is fitted with an integrated device, and the instrument compartment is equipped with a secondary terminal block; the circuit breaker is equipped with a secondary connector, and the partition between the circuit breaker compartment and the instrument compartment is equipped with a secondary socket that mates with the secondary connector, and the secondary socket is connected to the secondary terminal block; the integrated device is equipped with a secondary plug-in component, and the secondary plug-in component is connected to the secondary terminal block.

2. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 1, characterized in that: The switchgear housing is equipped with doors for the instrument compartment, circuit breaker compartment, busbar compartment, cable compartment, and vacant compartment, respectively; the left and right sides of the switchgear housing are respectively provided with a left side panel and a right side panel.

3. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 1, characterized in that: The circuit breaker is a composite current sampling circuit breaker, which includes a general-purpose circuit breaker and at least two current transformers; the general-purpose circuit breaker includes a circuit breaker body and three poles; the current transformers are mounted on the outside of the corresponding poles and are located in the middle of the arc-extinguishing chamber of the pole.

4. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 3, characterized in that: The composite current sampling circuit breaker is equipped with three primary input sockets and three primary output sockets; the primary input sockets are connected to the input contacts, and the primary output sockets are connected to the output contacts.

5. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 3, characterized in that: The current transformer includes a housing, a toroidal iron core, and a coil. The coil is wound on the toroidal iron core, and the coil and the toroidal iron core are located inside the housing. The general-purpose circuit breaker body has an L-shaped rear plate, and a fixing plate is fixedly arranged below the housing of the current transformer. The fixing plate is connected to the vertical surface of the L-shaped rear plate.

6. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 5, characterized in that: The outer casing is provided with a coil lead-out hole; the lead wire of the coil passes through the coil lead-out hole and is connected to the secondary connector via a cable.

7. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 1, characterized in that: The integrated device includes a housing, the interior of which is divided into a left chamber, a middle chamber, a right chamber, and a rear chamber; the left chamber is equipped with multiple functional pressure plates, the middle chamber is equipped with an LCD screen, the right chamber is equipped with multiple operating switches, and the rear chamber is equipped with a rear circuit board and a rear cover plate.

8. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 7, characterized in that: The rear chamber circuit board has an outer side and an inner side; the secondary plug-in component is installed on the outer side of the rear chamber circuit board, and the rear cover plate has a corresponding plug-in hole for the secondary plug-in component to pass through; the inner side of the rear chamber circuit board is provided with electronic components that realize comprehensive protection and control functions.

9. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 8, characterized in that: The outer surface of the rear chamber circuit board corresponds to the areas of the left chamber, middle chamber, and right chamber. The left chamber area is provided with a current sampling input secondary plug-in component. The middle chamber area is provided with a circuit breaker opening / closing status and energy storage status signal input secondary plug-in component, a secondary plug-in component for various forms of communication with external devices, and a secondary input plug-in component for connecting the output contacts of external protection devices. The right chamber area is provided with a circuit breaker control output secondary plug-in component for circuit breaker opening / closing and energy storage, and a secondary plug-in component for controlling the output of external fans and dehumidifiers.

10. A 12kV AC switchgear based on composite primary components and integrated secondary components according to claim 9, characterized in that: The current sampling input secondary plug-in component, the circuit breaker opening / closing status and energy storage status signal input secondary plug-in component, and the circuit breaker control output secondary plug-in component for circuit breaker opening / closing and energy storage are electrically connected to the secondary socket through the secondary terminal block.

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