High-voltage withdrawable switch cabinet

Abstract

The invention relates to the technical field of power supply equipment, in particular to a high-voltage movable switch cabinet which comprises a vertically arranged frame body, and box plates are fixedly connected to the left side and the right side of the frame body through bolts; a control chamber is arranged at the upper end of the front part of the frame body; the upper end of the rear part is provided with a wire inlet chamber in which a bus assembly is arranged; the lower end of the front part is provided with a circuit breaking chamber which is internally provided with a circuit breaking assembly and a valve assembly. A cable chamber is arranged at the lower end of the rear part and is internally provided with a grounding assembly and an on-off assembly; a linkage assembly is further arranged in the frame body, and the linkage assembly is used for achieving action linkage of the circuit breaking assembly and the on-off assembly so as to ensure that the circuit breaking assembly can be pulled out in the power-off state. The grounding assembly comprises a grounding switch, and the grounding switch achieves the on-off operation with the wire bar through the switching-on and switching-off operation of the grounding switch. The on-off assembly comprises a pull rod, and the pull rod pulls the grounding switch to perform rotary opening and closing operation.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply equipment, and particularly relates to a high-voltage draw-out switchgear cabinet. Background Art

[0002] The high-voltage draw-out switchgear cabinet is a key equipment in the power system, mainly used for the distribution, control and protection of electric energy. The existing high-voltage switchgear cabinets usually include a frame body, a control room, a breaker room, a cable room, etc., but there are still some problems and disadvantages in their structural and functional designs.

[0003] 1. Insufficient interlock safety: The breaker assembly and the grounding assembly in the existing switchgear cabinets are usually interlocked only through simple electrical signal control, and no mechanical blocking structure is provided, which may cause the circuit breaker to be accidentally pulled out when it is not completely powered off, posing a safety hazard.

[0004] 2. Complicated operation of the shutter assembly: The shutter assemblies of traditional switchgear cabinets mostly need to be opened and closed with the assistance of external tools, with cumbersome operation and low efficiency, and it is difficult to meet the requirements of coordinated protection.

[0005] 3. Low reliability of the grounding assembly: The existing earthing switches lack effective tensioning and limiting mechanisms, and the contact stability between the earthing knife and the static contact is insufficient, especially prone to poor contact problems after frequent operations.

[0006] In view of the above problems, it is particularly important to design a switchgear cabinet that can effectively improve the safety and operation convenience of the equipment. Summary of the Invention

[0007] In order to overcome the problems of insufficient interlock safety, complicated operation of the shutter assembly and low reliability of the grounding assembly in the prior art, the present invention provides a high-voltage draw-out switchgear cabinet, which significantly improves the safety and operation convenience of the equipment by optimizing the designs of the interlock assembly, the shutter assembly and the grounding assembly.

[0008] The technical solution adopted by the present invention to solve its technical problems is as follows: A high-voltage draw-out switchgear cabinet includes a vertically arranged frame body, and box plates are fixedly connected to the left and right sides thereof by bolts; a control room is provided at the upper end of the front part of the frame body, and switch components are arranged inside; an incoming line room is provided at the upper end of the rear part, and busbar components are arranged inside; a circuit breaker room is provided at the lower end of the front part, and circuit breaker components and shutter components are arranged inside; a cable room is provided at the lower end of the rear part, and grounding components and on-off components are arranged inside; a linkage component is further provided inside the frame body to realize the action linkage between the circuit breaker component and the on-off component, so as to ensure that the circuit breaker component can be pulled out in a power-off state; the grounding component includes a grounding switch, and the grounding switch realizes the on-off operation with the busbar through its own opening and closing operation; the on-off component includes a pull rod, and the grounding switch is rotated and opened and closed by pulling the pull rod; the circuit breaker component includes a frame and a circuit breaker, the frame is arranged inside the frame body and can be horizontally pushed in or pulled out, a circuit breaker following it is arranged at the upper part of the frame, and the circuit breaker is used to control the on-off operation of the electric energy transmission between the busbar component and the grounding component; the linkage component includes a guide rail, a shifting shaft, and a clamping plate, the guide rails are symmetrically arranged below the frame, a shifting shaft that can rotate around it is arranged outside one of the guide rails, and a clamping plate is sleeved at one end of the shifting shaft to block the frame when it is pulled out along the guide rail.

[0009] For the above-mentioned high-voltage draw-out switchgear cabinet, the busbar component includes a busbar and a bushing. The busbar is a three-phase line and is vertically arranged through the box plate, and the bushing is sleeved on the upper part of the box plate to support the busbar.

[0010] For the above-mentioned high-voltage draw-out switchgear cabinet, the grounding component further includes a current transformer, a zero-sequence current transformer, and a lightning arrester. The current transformer is arranged inside the frame body, and an outgoing line contact box connected to it is arranged at one end thereof. The other end of the current transformer is also connected to a grounding switch and a lightning arrester arranged at the upper part of the frame body.

[0011] For the above-mentioned high-voltage draw-out switchgear cabinet, the grounding switch includes a plate frame, a support shaft, a support plate, a static contact, and a grounding knife. The plate frame is symmetrically and horizontally arranged inside the frame body to provide basic support. A support shaft rotatably connected to it penetrates through the upper part of the plate frame. A support plate clamped to it is arranged at the upper part of the support shaft, and a grounding knife connected to it to realize the on-off of the grounding switch is arranged at one end of the support plate.

[0012] For the above-mentioned high-voltage draw-out switchgear cabinet, the on-off component further includes a shaft rod and a clamping fork. The shaft rod is arranged inside the frame body through a bearing seat. A pull rod is arranged at the upper part of the shaft rod near the support shaft. Clamping forks are symmetrically arranged at both ends of the pull rod. A crank arm is arranged at one end of the clamping fork in a pin-connected manner. One of the crank arms is sleeved on the shaft rod and axially limited by a bolt, and the other crank arm is sleeved on and clamped to the support shaft.

[0013] For the above-mentioned high-voltage withdrawable switchgear, the circuit breaker assembly further includes rollers, a handle, and guide plates. The rollers are arranged around the lower part of the frame through bearings to achieve assisted movement operation. Handles for easy pulling are symmetrically arranged at the front end of the frame. The guide plates are symmetrically arranged on both sides of the circuit breaker to control the follow-up opening and closing operation of the shutter assembly.

[0014] For the above-mentioned high-voltage withdrawable switchgear, the shutter assembly includes guide rods, door panels, connecting rods, and swing rods. The guide rods are vertically and symmetrically arranged inside the frame body. Vertically liftable door panels are arranged at intervals on the upper part of the guide rods. A swing rod connected to the door panel through a connecting rod is arranged on one side of the door panel.

[0015] For the above-mentioned high-voltage withdrawable switchgear, the shutter assembly further includes a pin shaft, a plate seat, and a first torsion spring. The plate seat is arranged on the inner side of the frame body. A pin shaft connecting one end of two swing rods in series is arranged on one side of the plate seat. A first torsion spring for torsionally tensioning the two swing rods is sleeved on the upper part of the pin shaft, thereby controlling the two door panels to move towards or away from each other.

[0016] For the above-mentioned high-voltage withdrawable switchgear, the linkage assembly includes a clamping plate, a card, and a second torsion spring. One end of the shift shaft is provided with a clamping plate connected thereto. A card connected to the clamping plate is arranged at one end inside the clamping plate. A clamping plate connected to the shift shaft is also arranged at the position of the clamping plate. A second torsion spring respectively abutting against the guide rail and the clamping plate is sleeved on one upper end of the shift shaft to tension the card and the clamping plate.

[0017] For the above-mentioned high-voltage withdrawable switchgear, notches are opened at positions corresponding to the card and the clamping plate on the upper part of the guide rail. The card extends into one of the notches to apply an angular limit to the circumferential rotation of the shift shaft. The clamping plate extends into the other notch and can be rotated into or out of the notch under the drive of the shift shaft.

[0018] The beneficial effects of the present invention are as follows: 1. Linkage assembly: Through the cooperation of the guide rail, the shift shaft, and the clamping plate, it is ensured that the circuit breaker can only be pulled out when it is in a power-off state, avoiding the risk of live operation and improving safety.

[0019] 2. Shutter assembly: Adopting the linkage structure of guide rods, door panels, and swing rods, combined with the tension of the torsion spring, realizes the automatic opening and closing of the door panels, making the operation more convenient and improving the maintenance efficiency.

[0020] 3. Grounding assembly: Optimize the grounding switch structure, add a support shaft, a support plate, and a linkage mechanism of a pull rod, improve the contact stability between the grounding knife and the static contact, reduce wear, and ensure grounding reliability. Brief Description of the Drawings

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the external structure of the embodiment.

[0023] Figure 2 Schematic diagram of the internal structure of the embodiment.

[0024] Figure 3 Schematic diagram of the structures of the busbar assembly and the grounding assembly.

[0025] Figure 4 Schematic diagram of the structure of the switch assembly.

[0026] Figure 5 Schematic diagram of the structures of the on-off assembly, the open-circuit assembly, the valve assembly, and the linkage assembly.

[0027] Figure 6 Schematic diagram of the structure of the grounding switch.

[0028] Figure 7 Schematic diagram of the structure of the on-off assembly.

[0029] Figure 8 Schematic diagram of the structure of the open-circuit assembly.

[0030] Figure 9 Schematic diagram of the structure of the valve assembly.

[0031] Figure 10 Schematic diagram of the structure of the linkage assembly.

[0032] Figure 11 Schematic diagram of the structures of the splint, the card, and the card board.

[0033] In the figure: 1, frame body; 11, box board; 2, busbar assembly; 21, partition board; 22, bus bar; 23, bushing; 24, insulator; 25, incoming line contact box; 3, switch assembly; 31, instrument door; 32, microcomputer protector; 33, live-line indicator; 34, ammeter; 35, change-over switch; 4, grounding assembly; 41, current transformer; 42, zero-sequence current transformer; 43, grounding switch; 44, lightning arrester; 45, outgoing line contact box; 431, plate frame; 432, support shaft; 433, support plate; 434, static contact; 435, grounding knife; 436, damper; 437, sensor; 5, on-off assembly; 51, shaft rod; 52, crank arm; 53, fork; 54, pull rod; 6, open-circuit assembly; 61, frame; 62, roller; 63, handle; 64, circuit breaker; 65, guide plate; 7, valve assembly; 71, guide rod; 72, door panel; 73, connecting rod; 74, swing rod; 75, pin shaft; 76, plate seat; 77, first torsion spring; 78, roller; 8, linkage assembly; 81, guide rail; 82, frame plate; 83, pressing piece; 84, connecting piece; 85, dialing arm; 86, dialing shaft; 87, second torsion spring; 88, splint; 89, card; 90, card board. Specific embodiments Embodiment

[0034] The high-voltage draw-out switchgear described in this embodiment, as Figures 1-11 shown, includes a frame body 1 welded by high-strength metal profiles, which has good mechanical strength and stability, can bear the weight of each component inside the switchgear and various stresses generated during operation. The left and right sides of the frame body 1 are fixedly connected with box plates 11 by bolts. The box plates 11 are made of high-quality steel plates and are surface-treated against corrosion, which not only plays a role in protecting the internal components but also can effectively shield electromagnetic interference.

[0035] A control room is arranged at the upper end of the front part of the frame body 1. The control room is the control core area of the switchgear, and switch components 3 are arranged inside for monitoring, controlling, and operating the running state of the switchgear. An incoming line room is arranged at the upper end of the rear part, which is mainly used for introducing external power. A busbar assembly 2 is arranged inside, responsible for transmitting the electric energy of the external power to the inside of the switchgear. A circuit breaker room is arranged at the lower end of the front part. The circuit breaker room is the key operation area of the switchgear, and a circuit breaker assembly 6 and a shutter assembly 7 are arranged inside. The circuit breaker assembly 6 can realize the quick insertion and extraction of the circuit breaker 64, and the shutter assembly 7 is used to isolate and protect the contact box when the circuit breaker 64 is extracted. A cable room is arranged at the lower end of the rear part, which is used to connect external cables. A grounding assembly 4 and a make-break assembly 5 are arranged inside to realize the grounding protection and make-break control of the cables.

[0036] The busbar assembly 2 is an important component for electric energy transmission inside the switchgear, including partition plates 21, busbars 22, and bushings 23. There are two partition plates 21, namely a rear partition plate 21 arranged at the rear of the incoming line room and a bottom partition plate 21 arranged at the bottom of the incoming line room. The two ends of the partition plates 21 are respectively connected with the box plates 11 by bolts, playing a role of isolation and support, reasonably dividing the internal space of the incoming line room, and improving safety and reliability. The busbars 22 are three-phase lines made of copper with high conductivity, which can effectively reduce the loss during electric energy transmission. One end of the busbars 22 is arranged vertically and passes through the box plate 11. In order to avoid the box plate 11 being electrified due to the direct contact between the busbars 22 and the box plate 11, a bushing 23 made of insulating material and used to support the busbars 22 is sleeved on the upper part of the box plate 11. The bushing 23 is made of high-performance insulating material, has good insulation performance and mechanical strength, can bear the weight of the busbars 22 and the vibration during operation. An insulator 24 for auxiliary fixing of the busbars 22 is additionally arranged on the upper part of the rear partition plate 21. The insulator 24 further enhances the stability of the busbars 22, preventing the busbars 22 from shaking or displacing during operation. One end of the busbars 22 is provided with an incoming line contact box 25 for realizing the power transmission connection operation. The incoming line contact box 25 is made of high-quality insulating material and has good conductive contact performance inside, which can ensure the reliable connection between the busbars 22 and the external power supply.

[0037] The switch assembly 3 includes an instrument door 31, which is horizontally arranged at the upper front part of the frame body 1. One side of the instrument door 31 can be opened and closed by rotating horizontally around the frame body 1 through a hinge. The upper part of the instrument door 31 is evenly distributed with a microcomputer protector 32, a live-line indicator 33, an ammeter 34, and a transfer switch 35. The microcomputer protector 32 is the core protection device of the switch cabinet. Using advanced microprocessor technology, it can monitor the operating status of the incoming line cabinet in real time, including parameters such as voltage, current, and frequency. When abnormal situations are detected, such as overcurrent, short-circuit, grounding and other faults, the microcomputer protector 32 can quickly issue a protection signal to cut off the faulty circuit and protect the safety of the switch cabinet and electrical equipment. At the same time, the microcomputer protector 32 also has data recording and communication control functions, which can store the operating data of the switch cabinet and upload it to the monitoring center through a communication interface, facilitating remote monitoring and management by operation and maintenance personnel. The live-line indicator 33 is used to detect whether the incoming line cabinet is energized, and it shows the energized state of the switch cabinet through intuitive indicator lights, providing an intuitive live-line indication for operation and maintenance personnel to avoid electric shock accidents caused by misoperation. The number of ammeters 34 is three, which are respectively used to measure the current states of the three phase lines of the busbar 22. The ammeters 34 adopt high-precision measuring elements, which can accurately measure the current magnitudes of the three phase lines of the busbar 22, providing accurate current data for operation and maintenance personnel to facilitate the timely discovery of current abnormalities. The transfer switch 35 is used for the switching operation between remote and local control. When the transfer switch 35 is in the local control position, operation and maintenance personnel can operate the switch cabinet on-site at the switch cabinet; when the transfer switch 35 is in the remote control position, operation and maintenance personnel can remotely operate the switch cabinet through the monitoring center, improving the control flexibility and automation level of the switch cabinet.

[0038] The grounding component 4 includes a current transformer 41, a zero-sequence current transformer 42, a grounding switch 43, and a lightning arrester 44. The number of current transformers 41 is three, which are evenly arranged side by side on the upper part of the rack 1 inside the cable chamber. One end of the current transformer 41 is connected to an outgoing line contact box 45 for realizing power transmission connection operation. The outgoing line contact box 45 is connected to an external cable to transmit the electric energy inside the switch cabinet to an external load. The other end of the current transformer 41 is also connected to the grounding switch 43 and the lightning arrester 44. The grounding switch 43 and the lightning arrester 44 are respectively arranged on the upper part of the rack 1 through bolts. The current transformer 41 converts the large current on the primary side into a small current on the secondary side in proportion for the ammeter 34 to use. At the same time, it can also provide a current signal to the microcomputer protector 32 for overcurrent, short-circuit and other protection functions. The accurate measurement and signal transmission of the current transformer 41 are crucial for the safe operation of the switch cabinet. It can timely reflect the current change of the line and provide an accurate judgment basis for the protection device. The grounding switch 43 includes a plate frame 431, a support shaft 432, a support plate 433, a static contact 434, a grounding knife 435, a damper 436, and a sensor 437. The plate frame 431 is symmetrically and horizontally arranged inside the rack 1, providing support and an installation foundation for other components of the grounding switch 43. The support shaft 432 is arranged through the upper part of the plate frame 431 and is rotatably connected thereto. The support shaft 432 can freely rotate on the plate frame 431. The upper part of the support shaft 432 is provided with a support plate 433 that is snap-connected thereto and thus rotates therewith. One end of the support plate 433 is provided with a grounding knife 435 connected thereto. The upper part of the plate frame 431 is provided with a sensor 437 fixedly connected thereto. One end of the sensor 437 is provided with a static contact 434 connected thereto. The static contact 434 is used to be fixedly connected to the busbar 22 inside the cable chamber. By rotating the support shaft 432, the grounding knife 435 can be driven by the support plate 433 to perform rotational opening and closing operations with the static contact 434, so that a controllable on-off operation can be carried out between the grounding switch 43 and the busbar 22. The damper 436 is installed on the support shaft 432 or related components, playing a role of buffering and stabilizing, preventing the grounding knife 435 from generating too large an impact force during the opening and closing process and protecting each component of the grounding switch 43 from damage. The sensor 437 can monitor the state of the grounding switch 43 in real time, such as the position and contact state of the grounding knife 435, and transmit this information to the microcomputer protector 32 to provide data support for the operation monitoring and protection of the switch cabinet.

[0039] The on-off component 5 includes a shaft rod 51, a crank arm 52, a fork 53, and a pull rod 54. The shaft rod 51 is arranged inside the frame body 1 and is connected to the frame body 1 through bearing seats at both ends to ensure that the shaft rod 51 can rotate stably. A pull rod 54 is arranged at the upper part of the shaft rod 51 near the support shaft 432. Forks 53 connected thereto are symmetrically arranged at both ends of the pull rod 54. A crank arm 52 connected thereto is arranged at one end of the fork 53. One of the crank arms 52 is sleeved on the shaft rod 51, and the other crank arm 52 is sleeved on the support shaft 432. A bolt for applying axial limit to the crank arm 52 is also arranged at the upper part of the shaft rod 51. The upper part of the support shaft 432 has a right-angled slot adapted to the crank arm 52, so that the crank arm 52 can rotate circumferentially synchronously with the support shaft 432. Thus, by rotating the shaft rod 51, the support shaft 432 can be driven to rotate by the crank arms 52 at both ends of the pull rod 54, realizing the spatial commutation drive operation between the support shaft 432 and the shaft rod 51. This drive mode can convert the rotational motion of the shaft rod 51 into the rotational motion of the support shaft 432, thereby realizing the opening and closing control of the earthing switch 43. At the same time, the spatial commutation drive design makes the internal structure of the switch cabinet more compact and improves the space utilization rate.

[0040] The disconnection component 6 includes a frame 61, rollers 62, a handle 63, a circuit breaker 64, and a guide plate 65. The frame 61 is horizontally arranged at the middle position inside the frame body 1, providing an installation platform for the circuit breaker 64 and other components. Rollers 62 connected thereto through bearings are arranged around the lower part of the frame 61. The rollers 62 enable the disconnection component 6 to move flexibly inside the frame body 1, facilitating the insertion and extraction operations of the circuit breaker 64. Handles 63 for easy pulling are symmetrically arranged at the front end of the frame 61. The design of the handles 63 conforms to the ergonomic principle, making the operation convenient and labor-saving. A circuit breaker 64 connected thereto is arranged above the frame 61. The circuit breaker 64 is a key protection and on-off device of the switch cabinet, which can quickly cut off the circuit in case of a circuit fault to protect the safety of electrical equipment. A plum blossom-shaped contact for connecting to the incoming line contact box 25 and the outgoing line contact box 45 respectively is arranged at the rear end of the circuit breaker 64. The plum blossom-shaped contact has good electrical conductivity and contact stability, ensuring a reliable connection between the circuit breaker 64 and the contact box. Guide plates 65 connected thereto and used to control the opening and closing of the shutter assembly 7 are symmetrically arranged on both sides of the circuit breaker 64. The guide plates 65 play a guiding role during the insertion and extraction of the disconnection component 6, and cooperate with the shutter assembly 7 to realize the isolation protection of the contacts.

[0041] The valve assembly 7 includes a guide rod 71, a door plate 72, a connecting rod 73, a swing rod 74, a pin shaft 75, a plate seat 76, and a first torsion spring 77. The guide rod 71 is vertically and symmetrically arranged inside the frame body 1 to provide guidance for the movement of the door plate 72. The upper part of the guide rod 71 is provided with the door plate 72 which is vertically reciprocally slidably connected along its surface. The door plate 72 is made of insulating material, which can effectively isolate the contact and prevent accidental contact. A swing rod 74 is arranged on one side of the door plate 72. A roller 78 which can roll along the inner wall surface of the guide plate 65 is vertically arranged at the end of the swing rod 74. There is a connecting rod 73 connecting the swing rod 74 and the door plate 72. Through the transmission of the connecting rod 73, the movement of the swing rod 74 can drive the movement of the door plate 72. In order to simultaneously drive the two door plates 72 to perform vertical lifting operations, a plate seat 76 is arranged on one side inside the frame body 1. A pin shaft 75 connecting one end of the two swing rods 74 is arranged on one side of the plate seat 76. A first torsion spring 77 which twists and tensions the two swing rods 74 is sleeved on the upper part of the pin shaft 75. In the initial state, the maximum distance between the two rollers 78 is greater than the inner wall surface distance of the guide plate 65. When the disconnection assembly 6 is pushed in, under the extrusion of the guide plate 65, the two rollers 78 are forced to generate a longitudinal contraction movement, and then roll along the inner wall surface of the guide plate 65. By means of the lever principle, the two door plates 72 connected by the connecting rod 73 at the other end of the swing rod 74 generate a separating movement, so that the incoming line contact box 25 and the outgoing line contact box 45 are exposed, so that the contacts at the end of the circuit breaker 64 are connected to the contact box. At this moment, the first torsion spring 77 begins to twist and store energy. When the disconnection assembly 6 is pulled out, the first torsion spring 77 will drive the two door plates 72 to generate an opposite reset movement along the guide rod 71, so as to cover the incoming line contact box 25 and the outgoing line contact box 45 and prevent accidental contact.

[0042] The linkage component 8 includes a guide rail 81, a frame plate 82, a pressing plate 83, a connecting plate 84, a dialing arm 85, a dialing shaft 86, a second torsion spring 87, a clamping plate 88, a card 89, and a clamping board 90. The guide rails 81 are symmetrically arranged below the frame 61 to provide guidance for the movement of the disconnection component 6. A dialing shaft 86 that can rotate around it is arranged outside one of the guide rails 81. One end of the dialing shaft 86 is provided with a clamping plate 88 connected thereto. One end inside the clamping plate 88 is provided with a card 89 connected thereto. A clamping board 90 is also sleeved on the upper part of the dialing shaft 86 at the position of the clamping plate 88. Notches are opened at the positions on the upper part of the guide rail 81 corresponding to the card 89 and the clamping board 90. The card 89 extends into one of the notches to apply an angular limit to the circumferential rotation of the dialing shaft 86, preventing the dialing shaft 86 from rotating beyond the rotation limit angle in the forward or reverse direction. The clamping board 90 extends into the other notch and can be screwed in or out driven by the dialing shaft 86. When the clamping board 90 is screwed into the notch, it will block the movement route of the roller 62 on the upper part of the guide rail 81, causing the disconnection component 6 to be unable to be pulled out at this time, thus playing a role in preventing the pulling operation of the circuit breaker 64 in the non-powered-off state. In order to stably place the card 89 and the clamping board 90 in the notch, a second torsion spring 87 is also sleeved on one end of the upper part of the dialing shaft 86. One end of the second torsion spring 87 abuts against the outer wall of the guide rail 81, and the other end of the second torsion spring 87 abuts against the frame plate, thereby realizing the circumferential tensioning operation of the dialing shaft 86 by means of the second torsion spring 87. In order to meet the linkage operation, the other end of the dialing shaft 86 is provided with a dialing arm 85 connected thereto. A frame plate 82 that can vertically move up and down along the inside of the frame body 1 is arranged below the dialing arm 85. The inner side of the frame plate 82 is connected to the dialing arm 85 through a connecting plate 84. The pressing plate 83 is sleeved on the upper part of the shaft rod 51 and rotates synchronously with it. The pressing plate 83 is of a cam-shaped structure. A convex edge that abuts against the pressing plate 83 extends outward from one side of the frame plate 82. Thus, as the pressing plate 83 rotates together with the shaft rod 51, the distance between its axis and the convex edge will change. Furthermore, by means of the torsion of the second torsion spring 87, the frame plate 82 is enabled to perform a vertical lifting operation. At the same time, the dialing shaft 86 will drive the card 89 and the clamping board 90 to perform a circumferential rotation operation to control whether the clamping board 90 limits the roller 62 in the notch. This linkage design realizes the linkage control of the on-off component 5 and the disconnection component 6 through a mechanical structure, improving the safety and reliability of the switch cabinet. When the on-off component 5 is in the connected state, the linkage component 8 performs a pulling and locking operation on the disconnection component 6; when the on-off component 5 is in the disconnected state, the linkage component 8 performs a pulling and unlocking operation on the disconnection component 6, ensuring that the switch cabinet will not malfunction when energized and guaranteeing the safety of operation and maintenance personnel and equipment.

[0043] In summary, the high-voltage type draw-out switch cabinet described in this embodiment realizes the coordinated work among various components through reasonable layout and careful design, improves the safety, reliability and automation level of the switch cabinet, and provides a strong guarantee for the stable operation of the power system.

[0044] When the present invention works, before using the switchgear cabinet, the operation and maintenance personnel first need to conduct a comprehensive inspection on the appearance of the switchgear cabinet. Check whether the cabinet panel 11 is deformed, damaged or rusted, ensure the tightness and integrity of the cabinet panel 11, prevent foreign objects from entering the interior of the switchgear cabinet and affecting the operation of the equipment. Check whether each connecting bolt is tightened and there is no loosening phenomenon. If loosening is found, appropriate tools should be used in time to tighten it to ensure the stability of the overall structure of the switchgear cabinet. Open the instrument door 31 of the control room and check whether the switch components 3 such as the microcomputer protector 32, the live-line indicator 33, the ammeter 34 and the transfer switch 35 are normal. The display screen of the microcomputer protector 32 should display normally without fault alarm information. The indicator light of the live-line indicator 33 should be in the off state, indicating that the switchgear cabinet is not energized at this time. The pointer of the ammeter 34 should point to the zero position or the initial position. The transfer switch 35 should be able to flexibly switch between the remote and local control modes. Enter the cable chamber and check whether the components in the grounding component 4 such as the current transformer 41, the zero-sequence current transformer 42, the grounding switch 43 and the lightning arrester 44 are firmly installed and the connecting wires are intact. Check whether the connection between the static contact 434 of the grounding switch 43 and the bus bar 22 is tight and whether the grounding knife 435 is in the correct initial position. In the breaker chamber, check the breaker component 6 and the shutter component 7, confirm that the petal-shaped contacts of the circuit breaker 64 are not damaged or deformed, the guide plate 65 has a smooth surface without obstruction. Check whether the door panel 72 of the shutter component 7 can slide flexibly on the guide rod 71, whether the roller 78 can roll smoothly along the inner wall surface of the guide plate 65, and whether the first torsion spring 77 is in a normal state without fracture or deformation. Use a professional insulation resistance tester to check the insulation performance of the switchgear cabinet, measure the insulation resistance between each component such as the bus bar component 2, the switch component 3, the grounding component 4, the on-off component 5, the breaker component 6 and the shutter component 7 respectively, and ensure that the insulation resistance value meets the relevant standards and requirements. If the insulation resistance value is too low, there may be problems such as insulation damage or moisture ingress, and timely treatment is required, such as replacing insulation components or drying treatment.

[0045] After confirming that there is no fault inside the switch cabinet and it meets the power-on conditions, first, the grounding switch 43 needs to be operated. Manually rotate the support shaft 432, which drives the support plate 433 and the grounding knife 435 to rotate, separating the grounding knife 435 from the static contact 434, thus disconnecting the grounding switch 43. During the operation, closely observe the status indication of the sensor 437 to ensure that the grounding switch 43 is properly disconnected. After the grounding switch 43 is disconnected, the electrical connection between the busbar 22 inside the switch cabinet and the ground is cut off, preparing for the subsequent power-on operation. After the grounding switch 43 is disconnected, operate the on-off component 5. By rotating the shaft rod 51, the shaft rod 51 drives the crank arms 52 at both ends of the pull rod 54 to move, and then drives the support shaft 432 to rotate, realizing the spatial commutation drive between the support shaft 432 and the shaft rod 51. This series of operations makes the on-off component 5 in a connected state, preparing for the introduction of external power. When operating the on-off component 5, pay attention to observing the movement of each component to ensure smooth transmission without jamming.

[0046] After the on-off component 5 is connected, the advancement operation of the circuit breaker component 6 can be carried out. The maintenance personnel hold the handle 63 at the front end of the frame 61 and slowly push the circuit breaker component 6, causing the roller 62 to move forward along the guide rail 81. During the advancement, the guide plates 65 on both sides of the circuit breaker 64 will gradually squeeze the roller 78 of the valve assembly 7. Since the farthest distance between the two rollers 78 in the initial state is slightly greater than the inner wall surface distance of the guide plate 65, the roller 78 is forced to produce a longitudinal contraction movement under the squeezing of the guide plate 65 and rolls along the inner wall surface of the guide plate 65. According to the lever principle, the other end of the swing rod 74 drives the two door plates 72 connected by the connecting rod 73 to move away from each other, causing the incoming line contact box 25 and the outgoing line contact box 45 to gradually be exposed. When the circuit breaker component 6 continues to advance, the plum blossom-shaped contact at the end of the circuit breaker 64 will gradually connect with the incoming line contact box 25 and the outgoing line contact box 45. At this time, the first torsion spring 77 begins to twist and store energy, providing a reset power for the subsequent pulling-out operation of the circuit breaker component 6. During the advancement, ensure that the connection between the circuit breaker 64 and the contact box is tight and reliable, avoiding poor contact. At the same time, pay attention to observing the status of the linkage component 8. When the on-off component 5 is connected, the linkage component 8 should be in a state of unlocking the pulling and pushing of the circuit breaker component 6, allowing the circuit breaker component 6 to advance smoothly.

[0047] After the disconnection component 6 is pushed in place, the external power supply can be connected to the switchgear cabinet. At this time, the microcomputer protector 32 starts to monitor the operating status of the incoming line cabinet in real time, including parameters such as voltage, current, and frequency. The live-line indicator 33 will show that the switchgear cabinet is energized, and the ammeter 34 will respectively show the current magnitudes of the three phase lines. The operation and maintenance personnel can confirm that the switchgear cabinet is normally powered on by observing the indications of these instruments and record the relevant data. At the same time, the microcomputer protector 32 will perform real-time analysis on the operation data. Once abnormal conditions such as overcurrent and short circuit faults are detected, it will immediately issue a protection signal to cut off the faulty circuit and protect the safety of the switchgear cabinet and electrical equipment.

[0048] According to the actual operation requirements, the operation and maintenance personnel can perform the switching operation between remote and local control through the transfer switch 35. When remote control is required, the transfer switch 35 is switched to the remote control position. The operation and maintenance personnel can perform remote operations on the switchgear cabinet through the monitoring center, such as opening and closing operations of the circuit breaker 64 and operations of the on-off component 5. When local control is required, the transfer switch 35 is switched to the local control position, and the operation and maintenance personnel can perform operations at the switchgear cabinet site. During the switching process, it is necessary to ensure correct operation to avoid equipment damage or safety accidents caused by misoperation. During the operation of the switchgear cabinet, the operation and maintenance personnel need to conduct regular inspections to check the operating status of each component, such as whether the opening and closing indications of the circuit breaker 64 are normal, whether the temperature of the current transformer 41 is too high, and whether the position of the grounding switch 43 is correct. At the same time, check whether the connection parts are loose and whether the insulating parts are aging or damaged. For the problems found, they should be dealt with in a timely manner to ensure the safe operation of the switchgear cabinet. The microcomputer protector 32 will record the operation data of the switchgear cabinet, and the operation and maintenance personnel need to regularly record and analyze these data. By analyzing the data, the operation trend of the switchgear cabinet can be understood, and potential fault hazards can be discovered in a timely manner. For example, if it is found that the current of a certain phase line is continuously high for a long time, there may be problems such as overloading or line faults, which need to be investigated and dealt with in a timely manner.

[0049] When the switch cabinet needs to be inspected or maintained, it is necessary to first perform a power-off operation. In the opposite order of the power-on operation, first operate the on-off component 5 to put it in the off state, and then operate the grounding switch 43 to make the grounding knife 435 contact with the static contact 434 to ground the line row 22 inside the switch cabinet to ensure the safety of the maintenance personnel. During the operation, it is necessary to strictly follow the operating procedures to ensure that each step is accurate. After the switch cabinet is completely powered off and grounded, the circuit breaker component 6 can be pulled out. Since the on-off component 5 is in the off state at this time, the linkage component 8 realizes the pull-out unlocking operation of the circuit breaker component 6. The operation and maintenance personnel hold the handle 63 and slowly pull out the circuit breaker component 6. During the pulling-out process, first The torsion spring 77 releases the stored force and drives the two door panels 72 to produce relative reset movement along the guide rod 71, covering the incoming contact box 25 and the outgoing contact box 45 to prevent accidental touch. When the circuit breaker assembly 6 is fully pulled out, it can be inspected, maintained or replaced. After the circuit breaker assembly 6 is pulled out, the operation and maintenance personnel can conduct a detailed inspection and cleaning of the circuit breaker 64, contacts, guide plate 65 and other components, check whether the contacts of the circuit breaker 64 are ablated, worn, etc., and polish or replace them if necessary, clean the dirt and oxides on the contact surface to ensure good contact. At the same time, check whether the movement of the door panel 72, roller 78, rocker arm 74 and other components of the valve assembly 7 is flexible. If there is any jamming, adjust and repair it in time.

[0050] After the inspection and maintenance work is completed, the circuit breaker assembly 6 is pushed back into the switch cabinet according to the pushing operation steps before power is turned on. During the pushing process, ensure that the circuit breaker 64 is tightly connected to the contact box and the valve assembly 7 is opened normally. After confirming that the circuit breaker assembly 6 is pushed into place, operate the grounding switch 43 to separate the grounding knife 435 from the static contact 434 to release the grounding state, operate the on-off assembly 5 to make it connected, and prepare for the introduction of external power. After the external power is connected, the operating status of the switch cabinet is monitored again through the microcomputer protector 32, the power display 33, the ammeter 34 and other instruments. After ensuring that everything is normal, the switch cabinet can resume normal operation.

[0051] Through the above detailed usage method, operation and maintenance personnel can safely and effectively operate the high-voltage removable switchgear of this embodiment, ensure the stable operation of the power system, and provide reliable protection for power supply.

Claims

1. A high-voltage draw-out switchgear, characterized in that: including a vertically arranged frame body (1), with box plates (11) fixedly connected to its left and right sides by bolts; at the upper end of the front part of the frame body (1) is a control room, inside which a switch assembly (3) is arranged; at the upper end of the rear part is an incoming line room, inside which a bus bar assembly (2) is arranged; at the lower end of the front part is a circuit breaker room, inside which a circuit breaker assembly (6) and a shutter assembly (7) are arranged; at the lower end of the rear part is a cable room, inside which a grounding assembly (4) and a make-break assembly (5) are arranged; inside the frame body (1), a linkage assembly (8) is also provided to realize the action linkage between the circuit breaker assembly (6) and the make-break assembly (5) to ensure that the circuit breaker assembly (6) can be pulled out in a power-off state; the grounding assembly (4) includes a grounding switch (43), and the grounding switch (43) realizes the make-break operation with the bus bar (22) through its own opening and closing operation; the make-break assembly (5) includes a pull rod (54), and the grounding switch (43) is rotated and opened and closed by pulling the pull rod (54); the circuit breaker assembly (6) includes a frame (61) and a circuit breaker (64), the frame (61) is arranged inside the frame body (1) and can be horizontally pushed in or pulled out, and a circuit breaker (64) following it is arranged on the upper part of the frame (61), and the circuit breaker (64) is used to control the make-break operation of the power transmission between the bus bar assembly (2) and the grounding assembly (4); the linkage assembly (8) includes guide rails (81), a shifting shaft (86), and a clamping plate (90), the guide rails (81) are symmetrically arranged below the frame (61), a shifting shaft (86) that can rotate around it is arranged outside one of the guide rails (81), and the clamping plate (90) is sleeved on one end of the shifting shaft (86) to block the frame (61) when it is pulled out along the guide rail (81); 2. The high-voltage draw-out switchgear according to claim 1, wherein: the bus bar assembly (2) includes a bus bar (22) and a bushing (23), the bus bar (22) is a three-phase line and is vertically arranged through the box plate (11), and the bushing (23) is sleeved on the upper part of the box plate (11) to support the bus bar (22); 3. The high-voltage withdrawable switchgear according to claim 1, wherein: the grounding assembly (4) further includes a current transformer (41), a zero-sequence current transformer (42), and a lightning arrester (44), the current transformer (41) is placed inside the frame body (1), and an outgoing line contact box (45) connected to it is arranged at one end of the current transformer (41), and the other end of the current transformer (41) is also connected to a grounding switch (43) and a lightning arrester (44) arranged on the upper part of the frame body (1); 4. The high-voltage draw-out switchgear according to claim 1, characterized in that: the grounding switch (43) includes a plate frame (431), a support shaft (432), a support plate (433), and a grounding knife (435), the plate frame (431) is symmetrically and horizontally arranged inside the frame body (1) to provide basic support, a support shaft (432) rotatably connected to it is arranged through the upper part of the plate frame (431), a support plate (433) clamped to it is arranged on the upper part of the support shaft (432), and a grounding knife (435) connected to it and used to realize the make-break of the grounding switch (43) is arranged at one end of the support plate (433); 5. The high-voltage withdrawable switchgear according to claim 1, wherein: The on-off component (5) further includes a shaft rod (51) and a fork (53). The shaft rod (51) is arranged inside the frame body (1) through a bearing seat. A pull rod (54) is arranged at the upper part of the shaft rod (51) near the support shaft (432). Forks (53) connected by pins are symmetrically arranged at both ends of the pull rod (54). A crank arm (52) connected by a pin is arranged at one end of the fork (53). One of the crank arms (52) is sleeved on the shaft rod (51) and axially limited by a bolt, and the other crank arm (52) is sleeved on the support shaft (432) and clamped.

6. The high-voltage withdrawable switchgear according to claim 1, wherein: The open-circuit component (6) further includes a roller (62), a handle (63), and a guide plate (65). The roller (62) is arranged around the lower part of the frame (61) through bearings to achieve assisted walking operation. Handles (63) convenient for pulling out are symmetrically arranged at the front end of the frame (61). The guide plates (65) are symmetrically arranged on both sides of the circuit breaker (64) to control the follow-up opening and closing operation of the valve component (7).

7. The high-voltage draw-out switchgear according to claim 1, characterized in that: The valve component (7) includes a guide rod (71), a door panel (72), a connecting rod (73), and a swing rod (74). The guide rods (71) are vertically and symmetrically arranged inside the frame body (1). The door panels (72) that can be vertically lifted and lowered are arranged at intervals at the upper part of the guide rods (71). A swing rod (74) connected to the door panel (72) through a connecting rod (73) is arranged on one side of the door panel (72).

8. The high-voltage withdrawable switchgear according to claim 7, characterized in that: The valve component (7) further includes a pin shaft (75), a plate seat (76), and a first torsion spring (77). The plate seat (76) is arranged on the inner side of the frame body (1). A pin shaft (75) connecting one ends of two swing rods (74) in series is arranged on one side of the plate seat (76). A first torsion spring (77) that twists and tensions the two swing rods (74) is sleeved on the upper part of the pin shaft (75), so as to control the two door panels (72) to move towards or away from each other.

9. The high-voltage draw-out switchgear according to claim 1, wherein: The linkage component (8) includes a clamping plate (88), a card (89), and a second torsion spring (87). A clamping plate (88) connected to the shift shaft (86) is arranged at one end of the shift shaft (86). A card (89) connected to the clamping plate (88) is arranged at one end inside the clamping plate (88). A clamping plate (90) connected to the shift shaft (86) is also arranged at the position of the clamping plate (88). A second torsion spring (87) that abuts against the guide rail (81) and the clamping plate (88) respectively is sleeved on one end of the upper part of the shift shaft (86) to tension the card (89) and the clamping plate (90).

10. The high-voltage withdrawable switchgear according to claim 9, wherein: Notches are formed at the positions of the guide rail (81) corresponding to the card (89) and the clamping plate (90). The card (89) extends into one of the notches to apply angular limit to the circumferential rotation of the shift shaft (86). The clamping plate (90) extends into the other notch and can be rotated into or out of the notch driven by the shift shaft (86).

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