High-voltage removable switchgear

Abstract

The present invention relates to the technical field of power supply equipment, and specifically to a high-voltage removable switch cabinet, a high-voltage removable switch cabinet, comprising a vertically arranged frame, with box plates fixedly connected on the left and right sides by bolts; a control room is provided at the upper front end of the frame, in which a switch assembly is arranged; an incoming line room is provided at the upper rear end, in which a busbar assembly is arranged; a circuit breaker room is provided at the lower front end, in which a circuit breaker assembly and a valve assembly are arranged; a cable room is provided at the lower rear end, in which a grounding assembly and a switching assembly are arranged; a linkage assembly is also provided inside the frame to realize the linkage between the circuit breaker assembly and the switching assembly to ensure that the circuit breaker assembly can be pulled out in a power-off state; the grounding assembly includes a grounding switch, which realizes the switching operation with the line bar through its own opening and closing operation; the switching assembly includes a pull rod, and the grounding switch is pulled by the pull rod to perform a rotational opening and closing operation.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply equipment, in particular to a high-voltage removable switch cabinet. Background Art

[0002] High-voltage removable switchgear is a key equipment in the power system, mainly used for the distribution, control and protection of electric energy. The high-voltage switchgear in the existing technology usually includes a frame, a control room, a circuit breaker room, a cable room and other parts, but its structure and functional design still have some problems and shortcomings.

[0003] 1. Insufficient linkage safety: The circuit breaker components and grounding components of existing switchgear are usually linked only through simple electrical signal control, without a mechanical blocking structure. This may cause the circuit breaker to be accidentally pulled out when the power is not completely cut off, posing a safety hazard.

[0004] 2. The operation of valve components is complex: the valve components of traditional switch cabinets often require the assistance of external tools to open and close. The operation is cumbersome and inefficient, and it is difficult to meet the needs of coordinated protection.

[0005] 3. Low reliability of grounding components: Existing grounding switches lack effective tensioning and limiting mechanisms, and the contact stability between the grounding knife and the static contact is insufficient, which can easily lead to poor contact problems, especially after frequent operation.

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

[0007] In order to overcome the problems of insufficient linkage safety, complex operation of valve components and low reliability of grounding components in the prior art, the present invention provides a high-voltage removable switchgear, which significantly improves the safety and operational convenience of the equipment by optimizing the design of linkage components, valve components and grounding components.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage removable switch cabinet, including a vertically arranged frame, with box plates fixedly connected on the left and right sides by bolts; a control room is provided at the upper front end of the frame, in which a switch assembly is arranged; an incoming line room is provided at the upper rear end, in which a busbar assembly is arranged; a circuit breaker room is provided at the lower front end, in which a circuit breaker assembly and a valve assembly are arranged; a cable room is provided at the lower rear end, in which a grounding assembly and a switching assembly are arranged; a linkage assembly is also provided inside the frame to realize the linkage between the circuit breaker assembly and the switching assembly to ensure that the circuit breaker assembly can be pulled out in the power-off state; the grounding assembly includes a grounding switch, and the grounding switch is connected to the grounding switch. The on-off operation with the line row is realized through its own opening and closing operation; the on-off assembly includes a pull rod, which pulls the grounding switch to perform a rotating opening and closing operation; the circuit breaker assembly includes a frame and a circuit breaker, the frame is arranged inside the frame, and can be pushed in or pulled out horizontally, and a circuit breaker is arranged on the upper part of the frame to move with it, and the circuit breaker is used to control the on-off operation of power transmission between the busbar assembly and the grounding assembly; the linkage assembly includes guide rails, a dial shaft, and a card plate, the guide rails are symmetrically arranged below the frame, and a dial shaft that can rotate around it is arranged on the outside of one of the guide rails, and the card plate is sleeved on one end of the dial shaft to block the frame when it is pulled out along the guide rail.

[0009] The above-mentioned high-voltage removable switch cabinet has a busbar assembly including a busbar and a bushing. The busbar is a three-phase busbar that passes vertically through the box plate. The bushing is sleeved on the upper part of the box plate to support the busbar.

[0010] The above-mentioned high-voltage removable switchgear, the grounding component also includes a current transformer, a zero-sequence transformer and a lightning arrester. The current transformer is placed inside the frame, and one end of the current transformer is arranged with an outgoing contact box connected to it. The other end of the current transformer is also connected to the grounding switch and lightning arrester arranged on the upper part of the frame.

[0011] The above-mentioned high-voltage removable switch 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 symmetrical and placed horizontally inside the frame to provide basic support. A support shaft rotatably connected to it is arranged through the upper part of the plate frame, and a support plate clamped with it is arranged on the upper part of the support shaft. One end of the support plate is connected to it and is arranged with a grounding knife for realizing the on and off of the grounding switch.

[0012] The above-mentioned high-voltage removable switch cabinet, the switching assembly also includes a shaft and a clamping fork. The shaft is arranged inside the frame through a bearing seat. A pull rod is arranged on the upper part of the shaft near the support shaft. Pin-connected clamping forks are symmetrically arranged at both ends of the pull rod. A pin-connected crank arm is arranged at one end of the clamping fork, one of the crank arms is sleeved on the shaft and assisted by bolts to apply axial limit, and the other crank arm is sleeved on the support shaft and clamped.

[0013] The above-mentioned high-voltage removable switchgear, the circuit breaker assembly also includes rollers, handles, and guide plates. The rollers are arranged around the lower part of the frame through bearings to achieve assisted operation. The front end of the frame is symmetrically arranged with handles for easy pulling out. The guide plates are symmetrically arranged on both sides of the circuit breaker to control the valve assembly to produce follow-up opening and closing operations.

[0014] The above-mentioned high-voltage removable switchgear, the valve assembly includes a guide rod, a door panel, a connecting rod, and a rocker arm. The guide rod is vertically and symmetrically arranged inside the frame. Vertically liftable door panels are arranged at intervals on the upper part of the guide rod, and a rocker arm connected to the door panel through a connecting rod is arranged on one side of the door panel.

[0015] The above-mentioned high-voltage removable switch cabinet, the valve assembly also includes a pin shaft, a plate seat, and a first torsion spring. The plate seat is arranged on the inner side of the frame. A pin shaft connected in series to one end of two rocker arms is arranged on one side of the plate seat. A first torsion spring is arranged on the upper part of the pin shaft to torsionally tension the two rocker arms, thereby controlling the two door panels to move toward or away from each other.

[0016] The above-mentioned high-voltage removable switch cabinet, the linkage assembly includes a splint, a card, and a second torsion spring. A splint connected to it is arranged at one end of the dial shaft, and a card connected to it is arranged at one end inside the splint. A card connected to the dial shaft is also arranged at the splint position. A second torsion spring is also sleeved on the upper end of the dial shaft, which is respectively in contact with the guide rail and the splint to tension the card and the card.

[0017] The above-mentioned high-voltage removable switch cabinet has slots on the upper part of the guide rail corresponding to the cards and the card plates. The card is inserted into one of the slots to impose an angle limit on the circumferential rotation of the dial shaft. The card plate is inserted into the other slot and can be rotated in or out under the drive of the dial shaft.

[0018] The beneficial effects of the present invention are:

[0019] 1. Linkage assembly: Through the cooperation of the guide rail, the pull shaft and the clamping plate, the circuit breaker can be pulled out only when the power is off, avoiding the risk of live operation and improving safety.

[0020] 2. Valve assembly: adopts the linkage structure of guide rod, door panel and rocker arm, combined with torsion spring tensioning, to achieve automatic opening and closing of door panel, which is more convenient to operate and more efficient to maintain.

[0021] 3. Grounding assembly: Optimize the grounding switch structure, add a support shaft, support plate and pull rod linkage mechanism to improve the contact stability between the grounding knife and the static contact, reduce wear and ensure grounding reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Figure 1Schematic diagram of the external structure of the embodiment.

[0024] Figure 2 Schematic diagram of the internal structure of the embodiment.

[0025] Figure 3 It is a structural diagram of the busbar assembly and grounding assembly.

[0026] Figure 4 Schematic diagram of the switch assembly.

[0027] Figure 5 It is a structural diagram of the on-off component, circuit breaker component, valve component, and linkage component.

[0028] Figure 6 Schematic diagram of the structure of the grounding switch.

[0029] Figure 7 It is a structural diagram of the switch component.

[0030] Figure 8 Schematic diagram of the structure of the circuit breaker component.

[0031] Figure 9 Schematic diagram of the structure of the valve assembly.

[0032] Figure 10 A structural diagram of the linkage component.

[0033] Figure 11 It is a structural diagram of the plywood, card and pallet.

[0034] In the figure: 1. Frame; 11. Box plate; 2. Busbar assembly; 21. Partition plate; 22. Wire bar; 23. Bushing; 24. Insulator; 25. Incoming contact box; 3. Switch assembly; 31. Instrument door; 32. Microcomputer protector; 33. Live display; 34. Ammeter; 35. Transfer switch; 4. Grounding assembly; 41. Current transformer; 42. Zero sequence transformer; 43. Grounding switch; 44. Lightning arrester; 45. Outgoing 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; 52. Crank arm; 53. Clamp fork; 54. Pull rod; 6. Circuit breaker 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. Rocker arm; 75. Pin; 76. Plate seat; 77. First torsion spring; 78. Roller; 8. Linkage assembly; 81. Guide rail; 82. Frame; 83. Pressing plate; 84. Connecting plate; 85. Driving arm; 86. Driving shaft; 87. Second torsion spring; 88. Clamp; 89. Card; 90. Card. DETAILED DESCRIPTION

[0035] Example

[0036] The high voltage removable switch cabinet described in this embodiment is as follows Figure 1-11 As shown, it includes a frame 1 welded from high-strength metal profiles, which has good mechanical strength and stability and can withstand the weight of the components inside the switch cabinet and various stresses generated during operation. The left and right sides of the frame 1 are fixedly connected with box plates 11 by bolts. The box plates 11 are made of high-quality steel plates and the surface is anti-corrosion treated. They not only protect the internal components but also effectively shield electromagnetic interference.

[0037] A control room is provided at the upper front end of the frame 1. The control room is the control core area of ​​the switch cabinet. Switch components 3 are arranged inside for monitoring, controlling and operating the operating status of the switch cabinet. An incoming line room is provided at the upper rear end. The incoming line room is mainly used to introduce external power supply. Busbar components 2 are arranged inside, which are responsible for transmitting the electric energy of the external power supply to the interior of the switch cabinet. A circuit breaker room is provided at the lower front end. The circuit breaker room is the key operating area of ​​the switch cabinet. Circuit breaker components 6 and valve components 7 are arranged inside. Circuit breaker components 6 can realize the rapid insertion and withdrawal of circuit breaker 64, and valve components 7 are used to isolate and protect the contact box when the circuit breaker 64 is withdrawn. A cable room is provided at the lower rear end. The cable room is used to connect external cables. Grounding components 4 and on-off components 5 are arranged inside to realize grounding protection and on-off control of the cable.

[0038] The busbar assembly 2 is an important component for the internal power transmission of the switch cabinet, including a partition 21, a line bar 22, and a bushing 23. The partition 21 has two parts, namely a rear partition 21 arranged at the rear of the incoming line room and a bottom partition 21 arranged at the bottom of the incoming line room. The two ends of the partition 21 are connected to the box plate 11 by bolts, which play the role of isolation and support, and reasonably divide the internal space of the incoming line room to improve safety and reliability. The line bar 22 is a three-phase line made of copper with high conductivity, which can effectively reduce the loss during power transmission. One end of the line bar 22 is arranged vertically and passes through the box plate 11. In order to avoid direct contact between the line bar 22 and the box plate 11 and cause the box plate 11 to be energized, a hole is placed on the box plate 11. A sleeve 23 of insulating material is arranged on the upper part to support the line bus 22. The sleeve 23 is made of high-performance insulating material, has good insulating performance and mechanical strength, and can withstand the weight of the line bus 22 and vibration during operation. An insulator 24 is added to the upper part of the rear partition 21 to assist in fixing the line bus 22. The insulator 24 further enhances the stability of the line bus 22 and prevents the line bus 22 from shaking or displacing during operation. One end of the line bus 22 is arranged with an incoming line contact box 25 for realizing 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 reliable connection between the line bus 22 and the external power supply.

[0039] The switch assembly 3 includes an instrument door 31, which is horizontally arranged at the upper front end of the frame 1. One side of the instrument door can be opened and closed by rotating horizontally around the frame 1 through a hinge. A microcomputer protector 32, a power display 33, an ammeter 34 and a transfer switch 35 are evenly distributed on the upper part of the instrument door 31. The microcomputer protector 32 is the core protection device of the switch cabinet. It adopts advanced microprocessor technology and can monitor the operating status of the incoming cabinet in real time, including parameters such as voltage, current, and frequency. When an abnormal situation is detected, such as overcurrent, short circuit, grounding and other faults, the microcomputer protector 32 can quickly send a protection signal to cut off the fault 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 the communication interface, so as to facilitate remote monitoring by operation and maintenance personnel. and management, the live display 33 is used to detect whether the incoming cabinet is energized, and the live status of the switch cabinet is displayed through an intuitive indicator light, providing intuitive live indication for the operation and maintenance personnel to avoid electric shock accidents caused by misoperation. There are three ammeters 34, which are used to measure the current status of the three phase lines of the line bank 22 respectively. The ammeter 34 adopts high-precision measuring elements, which can accurately measure the current of the three phase lines of the line bank 22, and provide accurate current data for the operation and maintenance personnel, so as to facilitate timely detection of current abnormalities. The transfer switch 35 is used for switching operations between remote and local control. When the transfer switch 35 is in the local control position, the operation and maintenance personnel can operate the switch cabinet at the switch cabinet site; when the transfer switch 35 is in the remote control position, the operation and maintenance personnel can remotely operate the switch cabinet through the monitoring center, which improves the control flexibility and automation level of the switch cabinet.

[0040] The grounding assembly 4 includes a current transformer 41, a zero-sequence transformer 42, a grounding switch 43, and a lightning arrester 44. There are three current transformers 41, which are evenly arranged side by side on the upper part of the frame 1 inside the cable room. One end of the current transformer 41 is connected to an outgoing contact box 45 for realizing the power transmission connection operation. The outgoing contact box 45 is connected to the external cable to transmit the power inside the switch cabinet to the 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 frame 1 by bolts. The current transformer 41 is connected to the primary side by The large current is proportionally converted into a small current on the secondary side for use by the ammeter 34. 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 changes 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 symmetrical and horizontally placed inside the frame 1, and is the other components of the grounding switch 43. Provide support and installation foundation, the upper part of the plate frame 431 is provided with a support shaft 432 rotatably connected thereto, the support shaft 432 can rotate freely on the plate frame 431, the upper part of the support shaft 432 is provided with a support plate 433 which is clamped therewith and rotates with it, 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 line row 22 inside the cable room, and the rotation of the support shaft 432 can be used with the help of the support plate 433 to bring The movable grounding knife 435 performs a rotational opening and closing operation with the static contact 434, thereby enabling a controllable on-off operation between the grounding switch 43 and the line bar 22. The damper 436 is installed on the support shaft 432 or related components to play a buffering and stabilizing role, preventing the grounding knife 435 from generating excessive impact force during the opening and closing process, and protecting the various components of the grounding switch 43 from damage. The sensor 437 can monitor the status of the grounding switch 43 in real time, such as the position and contact status 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.

[0041] The on-off assembly 5 includes a shaft 51, a crank arm 52, a clamping fork 53, and a pull rod 54. The shaft 51 is arranged inside the frame 1, and both ends are connected to the frame 1 through bearing seats to ensure that the shaft 51 can rotate stably. A pull rod 54 is arranged at the upper part of the shaft 51 near the support shaft 432. Clamping forks 53 connected to them are symmetrically arranged at both ends of the pull rod 54. A crank arm 52 connected to it is arranged at one end of the clamping fork 53. One of the crank arms 52 is arranged in a sleeve arrangement with the shaft 51, and the other crank arm 52 is arranged in a sleeve arrangement with the support shaft 432. The upper part of the shaft 51 is also provided with a clamping fork 53 for applying axial limit to the crank arm 52. Bolt, the upper part of the support shaft 432 has a right-angled slot that is compatible with the crank arm 52, so that the crank arm 52 can realize synchronous circumferential rotation along with the support shaft 432, so that by rotating the shaft 51, the support shaft 432 can be driven to rotate with the help of the crank arms 52 at both ends of the pull rod 54, thereby realizing the spatial reversing transmission operation between the support shaft 432 and the shaft 51. This transmission method can convert the rotational motion of the shaft 51 into the rotational motion of the support shaft 432, thereby realizing the opening and closing control of the grounding switch 43. At the same time, the spatial reversing transmission design makes the internal structure of the switch cabinet more compact and improves space utilization.

[0042] The circuit breaker assembly 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 in the middle of the frame 1 to provide a mounting platform for the circuit breaker 64 and other components. Rollers 62 connected to the frame 61 through bearings are arranged around the lower part of the frame 61. The rollers 62 enable the circuit breaker assembly 6 to move flexibly inside the frame 1, facilitating the insertion and extraction of the circuit breaker 64. The front end of the frame 61 is symmetrically arranged with a handle 63 for easy pulling out. The design of the handle 63 conforms to the principle of ergonomics and is easy and labor-saving to operate. The circuit breaker 64 connected to the frame 61 is arranged above the frame 61. 4 is the key protection and on-off device of the switch cabinet, which can quickly cut off the circuit when a circuit fault occurs to protect the safety of electrical equipment. The rear end of the circuit breaker 64 is arranged with plum blossom-shaped contacts for connecting to the incoming contact box 25 and the outgoing contact box 45 respectively. The plum blossom-shaped contacts have good conductivity and contact stability, which can ensure a reliable connection between the circuit breaker 64 and the contact box. Guide plates 65 connected to it for controlling the opening and closing of the valve assembly 7 are symmetrically arranged on both sides of the circuit breaker 64. The guide plates 65 play a guiding role in the insertion and extraction process of the circuit breaker assembly 6, and cooperate with the valve assembly 7 to achieve isolation protection for the contacts.

[0043] The movable door assembly 7 includes a guide rod 71, a door panel 72, a connecting rod 73, a rocker arm 74, a pin 75, a plate seat 76, and a first torsion spring 77. The guide rod 71 is vertically and symmetrically arranged inside the frame 1 to provide a guide for the movement of the door panel 72. The upper portion of the guide rod 71 is provided with a door panel 72 that can be vertically reciprocated and slidably connected along its surface. The door panel 72 is made of insulating material, which can effectively isolate the contacts and prevent accidental touch. A rocker arm 74 is arranged on one side of the door panel 72. The end of the rocker arm 74 is vertically provided with a roller 78 that can roll along the inner wall surface of the guide plate 65. A connecting rod 73 is connected between the rocker arm 74 and the door panel 72. Through the transmission action of the connecting rod 73, the movement of the rocker arm 74 can drive the movement of the door panel 72. In order to simultaneously drive the two door panels 72 to perform vertical lifting operations, a plate seat 76 is arranged on one side of the frame 1. A pin 75 connected in series with one end of the two rocker arms 74 is arranged on one side of the plate seat 76. When the breaker assembly 6 is pulled out, the first torsion spring 77 drives the two door plates 72 to return to the original position along the guide rod 71, thereby covering the incoming contact box 25 and the outgoing contact box 45 and preventing accidental contact.

[0044] The linkage assembly 8 includes a guide rail 81, a frame plate 82, a pressure piece 83, a connecting piece 84, a dial arm 85, a dial shaft 86, a second torsion spring 87, a splint 88, a card 89, and a card plate 90. The guide rails 81 are symmetrically arranged below the frame 61 to provide a guide for the movement of the circuit breaker assembly 6. A dial shaft 86 that can rotate around it is arranged on the outside of one of the guide rails 81. A splint 88 connected to it is arranged at one end of the dial shaft 86. A card 89 connected to it is arranged at one end of the splint 88. A card plate 90 is also arranged on the upper part of the dial shaft 86 at the position of the splint 88. A slot is opened at the position corresponding to the card 89 and the card plate 90 on the upper part of the guide rail 81. The card 89 penetrates into one of them. When the card plate 90 is screwed into the slot, it will block the movement path of the roller 62 on the upper part of the guide rail 81, so that the circuit breaker assembly 6 cannot be pulled out at this time, thereby preventing the circuit breaker 64 from being pulled out when the power is not cut off. In order to keep the card 89 and the card plate 90 stably placed in the slot, a second torsion spring 87 is also provided on one end of the upper part of the dial 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 is in contact with the outer wall of the guide rail 81. One end of the lever 86 is in contact with the frame plate, thereby realizing circumferential tensioning operation on the lever shaft 86 with the help of the second torsion spring 87. In order to meet the linkage operation, the other end of the lever shaft 86 is provided with a lever arm 85 connected thereto. A frame plate 82 which can be vertically lifted and lowered along the inside of the frame body 1 is provided below the lever arm 85. The inner side of the frame plate 82 is connected to the lever arm 85 through a connecting piece 84. The pressing piece 83 is sleeved on the upper part of the shaft rod 51 and rotates synchronously with it. The pressing piece 83 is a cam-shaped structure. A convex edge that abuts against the pressing piece 83 is extended outward on one side of the frame plate 82. As a result, the distance between the axis center and the convex edge of the pressing piece 83 changes as the coaxial rod 51 rotates, and then the torsion of the second torsion spring 87 is used to tighten the lever shaft 86. The force causes the frame plate 82 to be lifted and lowered in the vertical direction. At the same time, the dial shaft 86 drives the card 89 and the card plate 90 to rotate circumferentially to control whether the card plate 90 limits the roller 62 in the slot. This linkage design realizes the linkage control of the on-off component 5 and the circuit breaker component 6 through the mechanical structure, thereby improving the safety and reliability of the switch cabinet. When the on-off component 5 is connected, the linkage component 8 realizes the pull-out locking operation of the circuit breaker component 6; when the on-off component 5 is disconnected, the linkage component 8 realizes the pull-out unlocking operation of the circuit breaker component 6, thereby ensuring that the switch cabinet will not be misoperated when it is energized, thereby ensuring the safety of operation and maintenance personnel and equipment.

[0045] In summary, the high-voltage removable switchgear described in this embodiment achieves coordinated operation among various components through reasonable layout and careful design, improves the safety, reliability and automation level of the switchgear, and provides a strong guarantee for the stable operation of the power system.

[0046] When the present invention is working, before using the switch cabinet, the operation and maintenance personnel must first conduct a comprehensive inspection of the appearance of the switch cabinet, check whether the box plate 11 is deformed, damaged or rusted, ensure the sealing and integrity of the box plate 11, prevent external foreign matter from entering the switch cabinet and affecting the operation of the equipment, check whether the connecting bolts are tightened and whether there is any looseness. If looseness is found, it should be tightened in time with appropriate tools to ensure the stability of the overall structure of the switch cabinet, open the instrument door 31 of the control room, check whether the switch components 3 such as the microcomputer protector 32, the power display 33, the ammeter 34 and the transfer switch 35 are normal, the display screen of the microcomputer protector 32 should show normal without fault alarm information, the indicator light of the power display 33 should be off, indicating that the switch cabinet is not energized at this time, the pointer of the ammeter 34 should point to zero or the initial position, the transfer switch 35 should be able to flexibly switch between remote and local control modes, enter the cable room, check the current transformer 41, zero sequence transformer 42, grounding switch 43 and Check whether the lightning arrester 44 and other components are firmly installed and the connecting wires are intact. Check whether the static contact 434 of the grounding switch 43 is tightly connected to the wire row 22, and whether the grounding knife 435 is in the correct initial position. In the circuit breaker chamber, check the circuit breaker assembly 6 and the valve assembly 7 to confirm that the plum blossom-shaped contacts of the circuit breaker 64 are not damaged or deformed, and the surface of the guide plate 65 is smooth and unobstructed. Check whether the door plate 72 of the valve assembly 7 can slide flexibly on the guide rod 71, whether the roller 78 can roll smoothly along the inner wall of the guide plate 65, and whether the first torsion spring 77 is in normal condition without breakage or deformation. Use a professional insulation resistance tester to check the insulation performance of the switchgear. Measure the insulation resistance between each component, such as the busbar assembly 2, switch assembly 3, grounding assembly 4, on-off assembly 5, circuit breaker assembly 6 and valve assembly 7, to 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, which require timely treatment, such as replacing insulating components or drying.

[0047] After confirming that there is no fault inside the switch cabinet and the power-on conditions are met, the grounding switch 43 needs to be operated first. By manually rotating the support shaft 432, the support shaft 432 drives the support plate 433 and the grounding knife 435 to rotate, so that the grounding knife 435 is separated from the static contact 434, thereby disconnecting the grounding switch 43. During the operation, the status indication of the sensor 437 should be closely observed to ensure that the grounding switch 43 is disconnected normally. After the grounding switch 43 is disconnected, the electrical connection between the wire bar 22 inside the switch cabinet and the ground is cut off, preparing for subsequent power-on operations. After the grounding switch 43 is disconnected, the on-off assembly 5 is operated. By rotating the shaft 51, the shaft 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 reversing transmission between the support shaft 432 and the shaft 51. This series of operations puts the on-off assembly 5 in a connected state, preparing for the introduction of external power. When operating the on-off assembly 5, pay attention to the movement of each component to ensure smooth transmission and no jamming.

[0048] After the on-off assembly 5 is connected, the circuit breaker assembly 6 can be pushed. The operator holds the handle 63 at the front end of the frame 61 and slowly pushes the circuit breaker assembly 6 to move the roller 62 forward along the guide rail 81. During the pushing process, 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 distance between the farthest ends of the two rollers 78 in the initial state is slightly larger than the distance between the inner wall surfaces of the guide plates 65, the rollers 78 are forced to produce longitudinal contraction movement under the action of the guide plates 65 and roll along the inner wall surface of the guide plates 65. According to the principle of leverage, the two door panels 72 connected by the connecting rod 73 at the other end of the rocker arm 74 produce The backward movement causes the incoming contact box 25 and the outgoing contact box 45 to gradually be exposed. When the circuit breaker assembly 6 continues to advance, the plum blossom-shaped contacts at the end of the circuit breaker 64 will gradually connect with the incoming contact box 25 and the outgoing contact box 45. At this time, the first torsion spring 77 begins to twist and accumulate force to provide reset power for the subsequent pulling-out operation of the circuit breaker assembly 6. During the advancement process, it is necessary to ensure that the connection between the circuit breaker 64 and the contact box is tight and reliable to avoid poor contact. At the same time, pay attention to the status of the linkage assembly 8. When the on-off assembly 5 is connected, the linkage assembly 8 should be in a state of unlocking the circuit breaker assembly 6, allowing the circuit breaker assembly 6 to be smoothly advanced.

[0049] After the circuit breaker assembly 6 is pushed into place, the external power supply can be connected to the switch cabinet. At this time, the microcomputer protector 32 begins to monitor the operating status of the incoming cabinet in real time, including parameters such as voltage, current, and frequency. The power display 33 will show that the switch cabinet is energized, and the ammeter 34 will display the current size of the three phase lines respectively. The operation and maintenance personnel can confirm that the switch cabinet is normally energized by observing the indications of these instruments and record relevant data. At the same time, the microcomputer protector 32 will analyze the operating data in real time. Once an abnormal situation is detected, such as overcurrent, short circuit and other faults, it will immediately send a protection signal to cut off the fault circuit and protect the safety of the switch cabinet and electrical equipment.

[0050] According to actual operation requirements, the operation and maintenance personnel can switch 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, and the operation and maintenance personnel can remotely operate the switch cabinet through the monitoring center, such as the opening and closing operations of the circuit breaker 64, the operation of the on-off component 5, etc. When local control is required, the transfer switch 35 is switched to the local control position, and the operation and maintenance personnel can operate on the switch 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 switch cabinet, the operation and maintenance personnel need to conduct regular inspections to check the operating status of each component, such as Check whether the opening and closing indications of the circuit breaker 64 are normal, whether the temperature of the current transformer 41 is too high, whether the position of the grounding switch 43 is correct, etc. At the same time, check whether the connection parts are loose, whether the insulating components are aging or damaged, and deal with any problems found in a timely manner to ensure the safe operation of the switch cabinet. The microcomputer protector 32 will record the operating data of the switch cabinet. The operation and maintenance personnel need to record and analyze this data regularly. By analyzing the data, they can understand the operating trend of the switch cabinet and discover potential fault hazards in time. For example, if it is found that the current of a phase line is too high for a long time, there may be problems such as excessive load or line fault, which need to be checked and handled in time.

[0051] When the switch cabinet needs to be inspected or maintained, the power must be turned off first. In the opposite order of the power-on operation, the on-off component 5 is operated first to put it in the off state, and then the grounding switch 43 is operated to make the grounding knife 435 contact with the static contact 434, and the line bar 22 inside the switch cabinet is grounded to ensure the safety of the maintenance personnel. During the operation, the operating procedures must be strictly followed 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, driving 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, and check whether the contacts of the circuit breaker 64 are ablated, worn, etc. If necessary, polish or replace them, 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.

[0052] 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, 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 instruments such as the microcomputer protector 32, the power display 33, and the ammeter 34. After ensuring that everything is normal, the switch cabinet can resume normal operation.

[0053] 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 removable switchgear, characterized in that: include A vertically arranged frame (1) has box plates (11) fixedly connected to the left and right sides thereof by bolts; The upper front end of the frame (1) is provided with a control room, in which a switch assembly (3) is arranged; the upper rear end is provided with a line inlet room, in which a busbar assembly (2) is arranged; the lower front end is provided with a circuit breaker room, in which a circuit breaker assembly (6) and a valve assembly (7) are arranged; the lower rear end is provided with a cable room, in which a grounding assembly (4) and a switching assembly (5) are arranged; the frame (1) is also provided with a linkage assembly (8) for realizing static locking of the circuit breaker assembly (6), and the circuit breaker assembly (6) and the switching assembly (5) have an action linkage 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 on-off operation with the line row (22) through its own opening and closing operation. The grounding switch (43) includes a support shaft (432); The on-off assembly (5) includes a pull rod (54), which pulls the grounding switch (43) to perform a rotational opening and closing operation; The on-off assembly (5) further comprises a shaft (51) and a clamping fork (53), wherein the shaft (51) is arranged inside the frame (1) through a bearing seat, a pull rod (54) is arranged at a position on the upper part of the shaft (51) near the support shaft (432), and pin-connected clamping forks (53) are symmetrically arranged at both ends of the pull rod (54), and a pin-connected crank arm (52) is arranged at one end of the clamping fork (53), wherein one crank arm (52) is sleeved with the shaft (51) and assisted by bolts to apply axial limitation, and the other crank arm (52) is sleeved with the support shaft (432) and clamped; The circuit breaker assembly (6) comprises a frame (61) and a circuit breaker (64); the frame (61) is arranged inside the frame (1) and can be pushed in or pulled out horizontally; a circuit breaker (64) is arranged on the upper portion of the frame (61) and moves with the frame; the circuit breaker (64) is used to control the on-off operation of the power transmission between the busbar assembly (2) and the grounding assembly (4); The linkage assembly (8) comprises a guide rail (81), a frame plate (82), a pressing piece (83), a connecting piece (84), a driving arm (85), a driving shaft (86), and a card plate (90). The guide rails (81) are symmetrically arranged below the frame frame (61). A driving shaft (86) that can rotate around the guide rail (81) is arranged on the outside of one of the guide rails (81). The card plate (90) is sleeved on one end of the driving shaft (86) to perform a blocking operation when the frame frame (61) is pulled out along the guide rail (81). The other end of the driving shaft (86) is arranged with a driving arm (85) connected thereto. A frame plate (82) that can be vertically lifted and lowered along the inside of the frame body (1) is arranged below the driving arm (85). The inner side of the frame plate (82) is connected to the driving arm (85) through the connecting piece (84). The pressing piece (83) is sleeved on the upper part of the shaft rod (51) and rotates synchronously with the shaft rod, and can drive the frame plate (82) to realize the lifting operation in the vertical direction.

2. The high-voltage removable switchgear according to claim 1, characterized in that: The busbar assembly (2) comprises a line bar (22) and a bushing (23). The line bar (22) is a three-phase line and is arranged vertically through the box plate (11). The bushing (23) is sleeved on the upper part of the box plate (11) to support the line bar (22).

3. The high-voltage removable switchgear according to claim 1, characterized in that: The grounding assembly (4) further comprises a current transformer (41), a zero-sequence transformer (42) and a lightning arrester (44); the current transformer (41) is placed inside the frame (1), and one end of the current transformer is provided with an outlet contact box (45) connected thereto; 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 (1).

4. The high-voltage removable switchgear according to claim 1, characterized in that: The grounding switch (43) comprises a plate frame (431), a support plate (433), and a grounding knife (435). The plate frame (431) is symmetrical and horizontally placed inside the frame body (1) to provide basic support. A support shaft (432) rotatably connected to the plate frame (431) is arranged through the upper part of the plate frame (431). A support plate (433) connected to the support shaft (432) is arranged on the upper part of the support shaft (432). One end of the support plate (433) is arranged to be connected to the support plate and used to realize the grounding knife (435) of switching the grounding switch (433) on and off.

5. The high-voltage removable switchgear according to claim 1, characterized in that: The circuit breaker assembly (6) further comprises a roller (62), a handle (63), and a guide plate (65). The roller (62) is arranged around the lower portion of the frame (61) via bearings to achieve a walking-assisted operation. The front end of the frame (61) is symmetrically provided with a handle (63) for easy pulling out. The guide plates (65) are symmetrically arranged on both sides of the circuit breaker (64) to control the shutter assembly (7) to generate a follow-up opening and closing operation.

6. The high-voltage removable switchgear according to claim 1, characterized in that: The valve assembly (7) comprises a guide rod (71), a door panel (72), a connecting rod (73), and a swing rod (74). The guide rod (71) is vertically and symmetrically arranged inside the frame (1). A door panel (72) capable of vertically lifting and lowering is arranged at intervals above the guide rod (71). A swing rod (74) connected to the door panel (72) via a connecting rod (73) is arranged on one side of the door panel (72).

7. The high-voltage removable switchgear according to claim 6, characterized in that: The valve assembly (7) further comprises a pin (75), a plate seat (76), and a first torsion spring (77). The plate seat (76) is arranged on the inner side of the frame (1). A pin (75) connected in series to one end of two rocking rods (74) is arranged on one side of the plate seat (76). A first torsion spring (77) for torsionally tensioning the two rocking rods (74) is sleeved on the upper part of the pin (75), thereby controlling the two door panels (72) to move toward or away from each other.

8. The high-voltage removable switchgear according to claim 1, characterized in that: The linkage assembly (8) comprises a splint (88), a card (89), and a second torsion spring (87). A splint (88) connected to the splint is arranged at one end of the shift shaft (86), a card (89) connected to the splint is arranged at one end inside the splint (88), a card (90) connected to the shift shaft (86) is also arranged at the splint (88), and a second torsion spring (87) is sleeved on one end of the upper part of the shift shaft (86) so as to abut against the guide rail (81) and the splint (88) respectively to tighten the card (89) and the card (90).

9. The high-voltage removable switchgear according to claim 8, characterized in that: The guide rail (81) has slots at positions corresponding to the card (89) and the card plate (90). The card (89) is inserted into one of the slots to limit the circumferential rotation of the shift shaft (86). The card plate (90) is inserted into the other slot and can be rotated in or out under the drive of the shift shaft (86).

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