A multifunctional withdrawable low-voltage switchgear

Abstract

The present application relates to a multifunctional withdrawable low-voltage switchgear, and relates to the technical field of low-voltage switchgear, which includes eight mutually coordinated instrument rooms, a digital detection module compartment, a transformer power supply incoming line room, a dual-channel distribution bus room, a connecting bus outgoing line room, a module unit room, a feeder cable room, and an emergency standby cable room. The present application adopts a power distribution method of phase management and layered current interruption protection, so that maintenance personnel can quickly lock the fault circuit and fault current characteristics, split the fault circuit, and replace damaged parts, making the maintenance process efficient and convenient, and shortening equipment downtime.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage switch cabinets, and in particular to a multifunctional withdrawable low-voltage switch device. Background Art

[0002] At present, in low-voltage switchgear, the three-phase unbalance of the low-voltage switch is controlled by installing a three-phase load unbalance automatic control device (SPC) on the low-voltage power distribution user side.

[0003] In the related technology, when the distribution end of the low-voltage switchgear encounters a fault such as single-phase grounding, the operation and maintenance personnel need to disconnect the low-voltage switch and test each line in turn to determine the fault location. The operation and maintenance personnel can only perform maintenance after determining the fault location. The maintenance process of the low-voltage switchgear is complicated and cumbersome. Summary of the invention

[0004] In order to improve the maintenance efficiency of operation and maintenance personnel, the present application provides a multifunctional withdrawable low-voltage switchgear.

[0005] The present application provides a multifunctional withdrawable low-voltage switchgear adopts the following technical solution:

[0006] A multifunctional withdrawable low-voltage switchgear, comprising a main cabinet, a back cabinet and a side cabinet. The main cabinet is divided into a plurality of module unit rooms, a dual-channel distribution bus room, a feeder cable room, an instrument room and a digital detection module compartment. The back cabinet is provided with a transformer power supply incoming line room. The side cabinet is divided into a contact bus outgoing line room and an emergency standby cable room.

[0007] A number of incoming line components are arranged in the transformer power incoming line room, and different incoming line components are connected to different phase currents. A main bus corresponding to the number of incoming line components, a branch bus corresponding to the number of phase lines of the main bus, and a disconnector corresponding to the number of branch bus are arranged in the dual-channel distribution bus room. The incoming line components are connected to the corresponding main bus, and the disconnector is used to connect the main bus with the branch bus corresponding to the main bus;

[0008] Several single-phase protection components are arranged in the module unit room, and multiple single-phase protection components are arranged on the same branch bus, and the single-phase protection components are provided with an output component for connecting one of the phase circuits of the external distributor;

[0009] The single-phase protection component is provided with a current transformer for monitoring circuit data, and the digital detection module compartment is provided with a digital measurement and control device for controlling the opening or closing of the single-phase protection component.

[0010] By adopting the above technical solution, the modular low-voltage switchgear in the present invention operates in coordination through the eight compartments planned in the internal structure, thereby ensuring stable and efficient operation of the entire low-voltage power supply system.

[0011] The starting point of power access is the transformer power supply incoming line room. The current is distributed from the low-voltage cabinet here to the interconnection bus outgoing line and several single-phase protection components through the dual-channel distribution bus room. In addition, two sets of isolating switches are equipped in the dual-channel distribution bus room for current distribution. Each single-phase module unit is equipped with an independent current transformer to accurately monitor the load and power quality data of each single-phase circuit.

[0012] When the distribution end encounters single-phase grounding and other faults, the fault phase current transformer will send out a current alarm signal, and the digital measurement and control equipment will follow the fault category model. When the overcurrent multiple is less than the rated breaking current of the vacuum circuit breaker, the vacuum circuit breaker will open according to the operating instructions to cut off the fault. When the overcurrent multiple exceeds the rated breaking current of the vacuum circuit breaker, the digital measurement and control equipment will delay the instruction, and the fuse of the single-phase module unit will be responsible for breaking the short-circuit current.

[0013] Operation and maintenance personnel can quickly obtain fault information, exit the single-phase protection components of the faulty circuit, and isolate and cut off the root cause of the fault, which is conducive to avoiding further expansion and spread of the fault and preventing large-scale power outages.

[0014] At the same time, the main busbars, branch busbars and other intact circuits that are not in fault condition can continue to supply power, which helps reduce the losses caused by power outages and keeps most electrical equipment unaffected. After the fault is eliminated, the operation and maintenance personnel can replace the fuse of the faulty single-phase protection component and restore power supply.

[0015] This low-voltage cabinet adopts a power distribution method of phase management and layered current interruption protection, which enables maintenance personnel to quickly lock the fault circuit and fault current characteristics, split the fault circuit, and replace damaged parts, making the maintenance process efficient and convenient, shortening equipment downtime.

[0016] Optionally, the single-phase protection component includes an insulating bracket slidably connected to the module unit chamber, and the insulating bracket is provided with a fuse slidably connected to the corresponding branch bus and a vacuum arc extinguishing component slidably connected to the output component. The fuse and the vacuum arc extinguishing component are connected through a soft copper sheet.

[0017] By adopting the above technical solution, the single-phase protection component is modularized through the insulating bracket, which is convenient for operation and maintenance personnel to replace the single-phase protection component or some internal parts.

[0018] Optionally, the single-phase protection component also includes a permanent magnet component, in which a disconnect rod is slidably connected, and the end of the disconnect rod is rotatably connected to a first connecting plate and a second connecting plate, and the first connecting plate is rotatably connected to the second connecting plate, the first connecting plate is fixed to the insulating bracket, and the second connecting plate is rotatably arranged with the vacuum arc extinguishing element away from the output component.

[0019] By adopting the above technical solution, the opening of the single-phase protection component is achieved through the permanent magnet component, the opening rod, the first connecting plate and the second connecting plate, which is conducive to increasing the flexibility of the single-phase protection component.

[0020] Optionally, a plurality of slide rails are arranged on the inner walls on both sides of the module unit chamber, and guide bars corresponding to the number of the slide rails are arranged at the bottom of the insulating bracket, and the guide bars are slidably connected to the slide rails at corresponding positions.

[0021] By adopting the above technical solution, the sliding movement of the insulating bracket in the module unit chamber is achieved through the slide rails and the guide bars.

[0022] Optionally, a plurality of blocks are provided at the bottom of the insulating bracket, a transmission block is provided on the bottom surface of the module unit chamber, a transmission screw is threadedly connected to the transmission block and passes through the block, the transmission screw extends out of the module unit chamber, and a drive block for inserting a rotating handle is provided on the transmission screw.

[0023] By adopting the above technical solution, the single-phase protection component is opened and withdrawn by rotating the handle to rotate the drive block, so as to realize the replacement and maintenance of a single single-phase protection component.

[0024] Optionally, the instrument room is fully enclosed, and a plurality of transformer protection measurement and control devices electrically connected to the single-phase protection components on the same branch bus are arranged in the instrument room, and the transformer protection measurement and control devices are used to detect the current data flowing out of the single-phase protection components.

[0025] By adopting the above technical solution, the fully enclosed instrument room can isolate the interference of the external environment on the internal devices, so as to ensure that the devices can operate in a stable environment, thereby always collecting and transmitting data stably and accurately.

[0026] Optionally, a secondary busbar corresponding to the number of the main busbars is provided in the interconnecting busbar outlet room. The secondary busbar is connected to the main busbar through an isolating switch. Phase branch lines for connecting other low-voltage switches are provided on the secondary busbar. The phase branch lines run through the top of the side cabinet.

[0027] By adopting the above technical solution, segmented operation can be achieved, ensuring normal power supply to other areas when some areas are under maintenance or load adjustment;

[0028] It can realize parallel operation to enhance the capacity and stability of power supply during special periods such as peak power consumption; and when a section of the bus fails, it can quickly complete the fault switching to ensure the continuity and reliability of the entire low-voltage power supply system.

[0029] Optionally, the secondary busbar is provided with a phase lead-out line, which extends in a direction away from the phase branch line and extends into an emergency standby cable room located below the side cabinet. The emergency standby cable room is provided with a cable line, and the phase branch line is connected to the cable line.

[0030] By adopting the above technical solution, when the main incoming power supply is cut off, the normal power supply of the feeder circuit can be restored through the prepared emergency backup cable.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The low-voltage cabinet of this application adopts a power distribution method of phase management and layered current interruption protection, so that maintenance personnel can quickly lock the fault circuit and fault current characteristics, split the fault circuit, and replace damaged parts, making the maintenance process efficient and convenient, shortening equipment downtime;

[0033] 2. The low-voltage cabinet of this application can realize multiple operating modes to ensure the continuity and reliability of the low-voltage power supply system in some areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of this application;

[0035] Figure 2 It is a schematic diagram of the internal structure of the present application, mainly showing the transformer power supply incoming line room;

[0036] Figure 3 yes Figure 2 A shows a schematic diagram of the local structure;

[0037] Figure 4 It is a schematic diagram of the exploded structure of the present application, mainly showing the dual-channel distribution busbar room;

[0038] Figure 5 It is a schematic diagram of the explosion structure of the present application, mainly showing the single-phase protection component;

[0039] Figure 6 It is a schematic diagram of the exploded structure of the present application, mainly showing the rotating screw;

[0040] Figure 7 It is a schematic diagram of the explosion structure of the present application, which mainly embodies the fuse and the vacuum arc extinguishing component.

[0041] Description of the drawings: 1. Main cabinet; 2. Back cabinet; 3. Side cabinet; 4. Module unit room; 401. Insulation bracket; 402. Cabinet door; 403. Slide rail; 404. Guide strip; 405. Transmission block; 406. Stopper; 407. Transmission screw; 408. Gasket; 409. Limit block; 410. Screw spring; 411. Drive block; 412. Rotating handle; 413. Friction plate; 414. Friction gasket; 415. Fuse; 416, connecting contact; 417, connecting copper plate; 418, fusing contact; 419, first fixing frame; 420, first connecting plate; 421, second fixing frame; 422, operating insulator; 423, second connecting plate; 424, tripping rod; 425, permanent magnet assembly; 426, driving switch; 427, threaded rod; 428, vacuum arc extinguishing element; 429, soft copper sheet; 430, output contact; 431, Current transformer; 432, output contact seat; 433, output copper plate; 434, phase copper plate; 435, cable connector; 5, dual-channel distribution busbar room; 501, main busbar; 502, branch busbar; 503, first disconnector; 504, second disconnector; 6, feeder cable room; 7, instrument room; 701, transformer protection and measurement and control device; 702, intelligent fusion terminal; 8, digital detection module compartment; 801, digital measurement and control equipment; 9, transformer power supply incoming line room; 901, terminal board; 902, fixed plate; 10, connecting busbar outgoing line room; 1001, auxiliary busbar; 1002, phase branch line; 1003, phase lead-out line; 11, emergency standby cable room; 12, first insulating plate; 13, fourth insulating plate; 14, third insulating plate; 15, first isolating contact; 16, static contact seat; 17, second isolating contact. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1 -Attached Figure 7 , further details of this application are given.

[0043] A multifunctional withdrawable low-voltage switchgear, referring to Figure 1 , Figure 2 , including a main cabinet 1, a back cabinet 2 and a side cabinet 3, wherein the back cabinet 2 is fixedly connected to the outer shell on the back of the main cabinet 1, and the side cabinet 3 is fixedly connected to the outer shell on the side of the main cabinet 1. The main cabinet 1 is internally divided into a plurality of module unit rooms 4 located on the front of the main cabinet 1, a dual-channel distribution busbar room 5 located on the back of the module unit room 4, a feeder cable room 6 located below the module unit room 4, an instrument room 7 located above the module unit room 4, and a digital detection module compartment 8 located on the side of the module unit room 4 away from the side cabinet 3. A transformer power supply incoming line room 9 is arranged in the back cabinet 2, and the side cabinet 3 is divided into a connecting busbar outgoing line room 10 located above the side cabinet 3 and an emergency standby cable room 11 located below the side cabinet 3.

[0044] Reference Figure 2 , Figure 3 Four groups of incoming line components are installed in the transformer power incoming line room 9, each group of incoming line components includes a wiring board 901, one end of the wiring board 901 penetrates the side wall of the back cabinet 2 away from the main cabinet 1, and a through hole for connecting to an external power distribution terminal is provided on the end of the wiring board 901 away from the main cabinet 1. A first insulating plate 12 for fixing the wiring board 901 is sleeved on the end of the wiring board 901 away from the main cabinet 1, and the first insulating plate 12 is fixedly connected to the shell of the back cabinet 2 away from the main cabinet 1.

[0045] Four coplanar and transversely arranged main busbars 501 are installed in the dual-channel distribution busbar chamber 5. The four main busbars 501 are equidistantly arranged along the height direction of the main cabinet 1, and the four main busbars 501 are three phase lines and one neutral line. In addition, each group of incoming line components also includes a fixing plate 902, and the outer wall of each main busbar 501 close to the side of the back cabinet 2 is fixedly connected to the fixing plate 902, and the terminal board 901 is connected to the fixing plate 902 on the main busbar 501 at the corresponding position. Among them, three terminal boards 901 are connected to the fixing plate 902 through a transmission plate. A second insulating plate fixedly installed on the back of the main cabinet 1 is arranged between the terminal board 901 and the fixing plate 902, and the second insulating plate is sleeved on the terminal board 901.

[0046] Reference Figure 2 , Figure 4 Seven third insulating plates 14 are fixedly connected to the inner wall of the dual-channel distribution busbar chamber 5 on the side of the main busbar 501 away from the fixed plate 902, and a gap is provided between the third insulating plates 14 and the main busbar 501. Three transversely arranged branch busbars 502 are fixedly connected to the side of the third insulating plate 14 away from the main busbar 501, and the three branch busbars 502 are parallel to the three phase lines respectively.

[0047] A set of busbar connection components are provided on both sides of the dual-channel distribution busbar chamber 5, and a set of busbar connection components far away from the side cabinet 3 includes three first isolating switches 503 corresponding to the positions of the branch busbars 502. In addition, the shell of the first isolating switch 503 penetrates and fixes the corresponding branch busbar 502. The first isolating contact 15 corresponding to the number and position of the first isolating switch 503 is fixedly connected to the side of the main busbar 501 close to the branch busbar 502, and a first contact hole for connecting the first isolating switch 503 is opened in the first isolating contact 15. The connector of the first isolating switch 503 penetrates the third insulating plate 14 and extends toward the main busbar 501. It extends into the first contact hole and abuts against the inner wall of the first contact hole, so that the branch busbar 502 is connected with the main busbar 501.

[0048] Reference Figure 4Six static contact seats 16 arranged along the length are arranged on the side of the three branch busbars 502 away from the main busbar 501, and the static contact seats 16 extend into the module unit chamber 4. The module unit chamber 4 is provided with single-phase protection components corresponding to the number of static contact seats 16.

[0049] Reference Figure 1 , Figure 4 , Figure 5 The module unit room 4 has an opening on one side away from the back cabinet 2, and the single-phase protection assembly includes an insulating bracket 401, and a cabinet door 402 for closing the opening is fixedly connected to the side of the insulating bracket 401 away from the branch bus 502. The opposite side walls on both sides of the module unit room 4 are fixedly connected with slide rails 403, and two guide bars 404 are fixedly connected below the insulating bracket 401, and the guide bars 404 are sleeved on the slide rails 403 and slide along the surface of the slide plate.

[0050] Reference Figure 4 , Figure 5 , Figure 6 The bottom surface of the module unit chamber 4 is fixedly connected with a transmission block 405, and the insulating bracket 401 is fixedly connected with two blocks 406 on the lower end surface between the two guide bars 404, and the two blocks 406 are arranged between the transmission block 405 and the cabinet door 402. The cabinet door 402 is rotatably connected with a transmission screw 407 that passes through the two blocks 406 and the transmission block 405 in sequence, and the transmission screw 407 is threadedly connected with the transmission block 405.

[0051] A gasket 408 is sleeved on the part of the transmission screw 407 between the stopper 406 and the cabinet door 402, and the side of the gasket 408 away from the cabinet door 402 abuts against the stopper 406 on the corresponding side. A limit block 409 is fixedly connected to the side wall of the transmission screw 407, and the limit block 409 abuts against the side of the gasket 408 close to the cabinet door 402.

[0052] The transmission screw 407 is sleeved with a screw spring 410 between the two stoppers 406, and both ends of the screw spring 410 are in contact with the stoppers 406 on the corresponding side. A driving block 411 fixedly connected to the transmission screw 407 is provided on the outer surface of the cabinet door 402. A driving groove is provided on the side of the driving block 411 away from the transmission screw 407. A rotating handle 412 is inserted into the driving groove. The transmission screw 407 is driven to rotate synchronously by controlling the rotating handle 412, so as to realize the sliding of the insulating bracket 401 on the slide rail 403.

[0053] A square hole is formed on the bottom surface of the module unit chamber 4 on one side of the transmission block 405, and a friction plate 413 in the shape of a "convex" is arranged in the square hole, and the friction plate 413 is fixedly connected to the bottom surface of the module unit chamber 4 on the side away from the stopper 406. The friction plate 413 extends into the square hole and abuts against the inner wall of the square hole. In addition, a friction pad 414 is fixedly connected to the lower end surface of the insulating bracket 401 corresponding to the friction section position, and the friction pad 414 abuts against the friction plate 413.

[0054] Reference Figure 4 , Figure 5 , Figure 7 The insulating support 401 is divided into a fuse chamber located above the insulating support 401 and an arc extinguishing chamber located below the insulating support 401. A fuse 415 is installed in the fuse chamber, and connecting pieces are fixedly connected on both sides of the fuse 415. The connecting pieces are provided with connecting contacts 416 that pass through the connecting pieces and the insulating support 401 in sequence.

[0055] The connection contact 416 of the fuse 415 near the branch bus 502 is penetrated by one end of the connection copper plate 417, and the connection copper plate 417 is in contact with the connection piece on this side. In addition, the other end of the connection copper plate 417 is fixedly connected with a fuse contact 418 in contact with the branch bus 502, so that the current on the branch bus 502 flows into the fuse 415.

[0056] A first fixing frame 419 is fixedly connected to the inner wall of the arc extinguishing chamber near the cabinet door 402, and the outer walls on both sides of the first fixing frame are rotatably connected to the first connecting plate 420. A clamping assembly is fixedly connected to the inner walls on both sides of the arc extinguishing chamber, and a second fixing frame 421 is clamped in the clamping assembly, and the second fixing frame 421 is fixedly connected to the bottom surface of the arc extinguishing chamber.

[0057] An operating insulator 422 is fixed through the second fixing frame 421, and a second connecting plate 423 is rotatably connected to the side walls on both sides of the connecting end of the operating insulator 422 close to the cabinet door 402. The second connecting plate 423 is rotatably connected to the first connecting plate 420 on the corresponding side through a rotating shaft.

[0058] One end of a tripping rod 424 is sleeved on the rotating shaft, and the tripping rod 424 extends vertically upward away from the bottom surface of the arc extinguishing chamber. A permanent magnet assembly 425 is fixedly connected to the upper end surface of the arc extinguishing chamber, and the tripping rod 424 extends into the permanent magnet assembly 425 and is connected to the permanent magnet assembly 425. In addition, a driving switch 426 is electrically connected to the permanent magnet assembly 425, and the tripping rod 424 is controlled by the driving switch 426 to slide up and down in the permanent magnet assembly 425 and the arc extinguishing chamber, thereby controlling the operating insulator 422 to slide in the second fixing member.

[0059] The other end of the operating insulator 422 away from the second terminal board 423 is fixedly connected with a threaded rod 427, and one end of a vacuum arc extinguishing member 428 is threadedly connected to the threaded rod 427. A soft copper sheet 429 for connecting the connection contact 416 on the other side of the fuse 415 away from the connection copper plate 417 is sleeved on the threaded rod 427. A mounting piece and a gasket 408 for fixing the soft copper sheet 429 are also sleeved on the threaded rod 427, and the mounting piece and the gasket 408 cooperate to prevent the threaded rod 427 from being exposed.

[0060] The other end of the vacuum arc extinguishing element 428 away from the soft copper sheet 429 is fixedly connected to an output contact 430, and the output contact 430 penetrates the side wall of the arc extinguishing chamber away from the cabinet door 402. A current transformer 431 is fixedly connected to the side of the third insulating plate 14 close to the cabinet door 402. In addition, an output contact holder 432 is embedded on the third insulating plate 14, and one end of the output contact holder 432 extends into the current transformer 431, and the output contact 430 extends into the output contact holder 432, so that the current flows from the output contact 430 into the output contact holder 432.

[0061] An output copper plate 433 is fixedly connected to the side of the third insulating plate 14 away from the cabinet door 402, and the output copper plate 433 is fixedly connected to the output contact seat 432. One end of a phase copper plate 434 is fixedly connected to the output copper plate 433, and the other end of the phase copper plate 434 extends toward the bottom of the module unit chamber 4, and a cable connector 435 is fixedly connected to the lower end of the phase copper plate 434, and the phase copper plates 434 in the single-phase protection assembly connected to the same branch bus 502 output current of the same phase.

[0062] In addition, the bottom of the module unit chamber 4 is connected to the feeder cable chamber 6 located below the module unit chamber 4. One end of the cable placed in the feeder cable chamber 6 is connected to the cable connector 435 of the corresponding phase, and the other end is connected to the external electrical equipment.

[0063] Reference Figure 1 , Figure 2 The instrument room 7 is located above the module unit room 4 and is fully enclosed. Three transformer protection measurement and control devices 701 are arranged inside the instrument room 7, and each transformer protection measurement and control device 701 corresponds to detecting a phase circuit, wherein the operation panel of the transformer measurement and control protection device is arranged on the surface of the instrument room 7 to facilitate the user to operate. In addition, the instrument room 7 is also provided with an intelligent fusion terminal 702 for processing the phase circuit data collected by the transformer protection measurement and control device 701, and the operation panel of the intelligent fusion terminal 702 is arranged on the surface of the instrument room 7.

[0064] Reference Figure 1 , Figure 2 , Figure 4The digital detection module compartment 8 is located on the side of the module unit room 4 away from the side cabinet 3, and is equipped with three digital measurement and control devices 801 for detecting three phases respectively, and each digital monitoring device is equipped with a sensor for collecting data of the corresponding connected branch bus 502.

[0065] Reference Figure 2 The interconnecting busbar outlet room 10 is located above the side cabinet 3, and four secondary busbars 1001 corresponding to the positions of the main busbar 501 are arranged inside it, and the four secondary busbars 1001 include three phase lines and one neutral line, and the phase line of the secondary busbar 1001 corresponds to the phase line position of the main busbar 501.

[0066] Reference Figure 2 , Figure 4 , a group of busbar connection components arranged near the side cabinet 3 on the dual-channel distribution busbar room 5 includes three second isolating switches 504 corresponding to the positions of the phase lines in the secondary busbar 1001, and the shells of the second isolating switches 504 penetrate and fix the corresponding secondary busbar 1001. The side of the main busbar 501 close to the secondary busbar 1001 is fixedly connected with second isolating contacts 17 corresponding to the number and position of the second isolating switches 504, and the second isolating contacts 17 are provided with second contact holes for connecting the second isolating switches 504. The connector of the second isolating switch 504 extends toward the main busbar 501, extends into the second contact hole and abuts against the inner wall of the second contact hole, so that the secondary busbar 1001 is connected with the main busbar 501.

[0067] A phase branch line 1002 is fixedly connected to the secondary busbar 1001, and the phase branch line 1002 runs through the top of the side cabinet 3. A fourth insulating plate 13 is sleeved on a section of the phase branch line 1002 outside the side cabinet 3, and the phase branch line 1002 is fixedly connected to the side cabinet 3 through the fourth insulating plate 13. A phase lead-out line 1003 is fixedly connected to the secondary busbar 1001, and the phase lead-out line 1003 extends in a direction away from the phase branch line 1002 and extends into the emergency standby cable room 11 located below the side cabinet 3. The phase lead-out line 1003 can be connected to the cable in the emergency standby cable room 11.

[0068] The implementation principle of the embodiment of the present application is: the external part is connected to the incoming line components of different phases through cables, so that the phase lines in each of the three main busbars 501 flow into currents of different phases. As a result, the phase line of one of the main busbars 501 corresponds to the connected branch busbar 502, and the single-phase protection component on the same branch busbar 502 flows with current of one phase. In addition, each single-phase protection component is equipped with an independent current transformer 431, which can accurately monitor the load and power quality data of each single-phase circuit.

[0069] When the distribution end encounters single-phase grounding and other faults, the fault phase current transformer 431 can send out a current alarm signal, and the digital measurement and control equipment 801 will follow the fault category model so that when the overcurrent multiple is less than the rated breaking current of the vacuum circuit breaker, the vacuum circuit breaker will open according to the operating instructions to cut off the fault; when the overcurrent multiple exceeds the rated breaking current of the vacuum circuit breaker, the digital measurement and control equipment 801 delays the instruction, and the fuse 415 of the single-phase module unit is responsible for breaking the short-circuit current.

[0070] Since the transformer protection measurement and control device 701 and the digital measurement and control equipment 801 are connected to the same branch bus 502, the current passing through the branch bus 502 and the connected unidirectional protection components are measured and controlled through the cooperation of the two. The operation and maintenance personnel can obtain the fault information in the first time, accurately exit the unidirectional protection component of the fault circuit, isolate and cut off the root cause of the fault, effectively avoid the further expansion and spread of the fault, and prevent the occurrence of large-scale power outages. At the same time, the busbar and other intact circuits of the system continue to supply power, minimizing the losses caused by power outages, ensuring that most electrical equipment is not affected, maintaining the continuity of production and life, and fully meeting the power needs in different scenarios. After the fault is eliminated, the operation and maintenance personnel can replace the fuse 415 of the faulty unidirectional protection component and restore power supply.

[0071] In addition, when the main incoming power supply is cut off, the dual-channel bus distribution is broken through the isolating switch to disconnect the main power incoming circuit. The normal power supply of the feeder circuit can be quickly restored through the prepared emergency backup cable.

[0072] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multifunctional withdrawable low-voltage switchgear, characterized in that: The invention comprises a main cabinet (1), a back cabinet (2) and a side cabinet (3); the main cabinet (1) is internally divided into a plurality of module unit rooms (4), a dual-channel distribution bus room (5), a feeder cable room (6), an instrument room (7) and a digital detection module compartment (8); a transformer power supply incoming line room (9) is arranged in the back cabinet (2); and the side cabinet (3) is internally divided into a contact bus outgoing line room (10) and an emergency standby cable room (11); The transformer power supply incoming line chamber (9) is provided with a plurality of incoming line assemblies, and different incoming line assemblies are connected to different phase currents; the dual-channel distribution bus chamber (5) is provided with main busbars (501) corresponding to the number of incoming line assemblies, branch busbars (502) corresponding to the number of phase lines of the main busbar (501), and isolating switches corresponding to the number of branch busbars (502); the incoming line assemblies are connected to the corresponding main busbars (501), and the isolating switches are used to connect the main busbars (501) to the branch busbars (502) corresponding to the main busbars (501); A plurality of single-phase protection components are arranged in the module unit chamber (4), and a plurality of single-phase protection components are arranged on the same branch bus (502), and an output component for connecting to one of the phase circuits of an external distributor is arranged on the single-phase protection component; The single-phase protection component is provided with a current transformer (431) for monitoring circuit data, and the digital detection module compartment (8) is provided with a digital measurement and control device (801) for controlling the opening or closing of the single-phase protection component.

2. A multifunctional withdrawable low-voltage switchgear according to claim 1, characterized in that: The single-phase protection component comprises an insulating support (401) slidably connected to the module unit chamber (4), a fuse (415) slidably connected to the corresponding branch bus (502) and a vacuum arc extinguishing component (428) slidably connected to the output component are arranged in the insulating support (401), and the fuse (415) and the vacuum arc extinguishing component (428) are connected to each other through a soft copper sheet (429).

3. A multifunctional withdrawable low-voltage switchgear according to claim 2, characterized in that: The single-phase protection component also includes a permanent magnet component (425), a trip rod (424) is slidably connected inside the permanent magnet component (425), the end of the trip rod (424) is rotatably connected to a first connecting plate (420) and a second connecting plate (423), and the first connecting plate (420) is rotatably connected to the second connecting plate (423), the first connecting plate (420) and the second connecting plate (423) are fixedly arranged with the insulating bracket (401), and the second connecting plate (423) and the vacuum arc extinguishing member (428) are rotatably arranged away from the output component.

4. The multifunctional withdrawable low-voltage switchgear according to claim 2, characterized in that: The inner walls on both sides of the module unit chamber (4) are provided with a plurality of slide rails (403), and the bottom of the insulating bracket (401) is provided with guide bars (404) corresponding to the number of the slide rails (403), and the guide bars (404) are slidably connected to the slide rails (403) at corresponding positions.

5. A multifunctional withdrawable low-voltage switchgear according to claim 4, characterized in that: A plurality of blocks (406) are arranged at the bottom of the insulating support (401), a transmission block (405) is arranged at the bottom surface of the module unit chamber (4), a transmission screw (407) which passes through the block (406) is threadedly connected to the transmission block (405), the transmission screw (407) extends out of the module unit chamber (4), and a driving block (411) for inserting a rotating handle (412) is arranged on the transmission screw (407).

6. The multifunctional withdrawable low-voltage switchgear according to claim 1, characterized in that: The instrument room (7) is fully enclosed and is provided with a plurality of transformer protection measurement and control devices (701) electrically connected to the single-phase protection components on the same branch bus (502). The transformer protection measurement and control devices (701) are used to detect current data flowing out of the single-phase protection components.

7. The multifunctional withdrawable low-voltage switchgear according to claim 1, characterized in that: The interconnecting busbar outlet chamber (10) is provided with secondary busbars (1001) corresponding in number to the number of main busbars (501); the secondary busbars (1001) are connected to the main busbars (501) via an isolating switch; the secondary busbars (1001) are provided with phase branch lines (1002) for connecting other low-voltage switches; and the phase branch lines (1002) run through the top of the side cabinet (3).

8. The multifunctional withdrawable low-voltage switchgear according to claim 7, characterized in that: The secondary busbar (1001) is provided with a phase lead-out line (1003), and the phase lead-out line (1003) extends in a direction away from the phase branch line (1002) and extends into an emergency standby cable room (11) located below the side cabinet (3), and the emergency standby cable room (11) is provided with a cable line, and the phase branch line (1002) is connected to the cable line.

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