An outlet cabinet

Abstract

The utility model discloses a kind of outgoing line cabinet, belong to electric power distribution equipment technical field, including cabinet, sealing structure, interlocking system, grounding system, secondary line system and electrical component;Cabinet is composed of side plate, front plate, back plate, top cover, bottom disc and guide rail, adaptive handcart sliding;Sealing structure is realized IP4X protection by sealing gasket assembly group and band-shaped sealing ring, prevent dust, water vapor infiltration;Interlocking system adopts door-ground linkage design, front door locking when circuit breaker closing, rear door locking when grounding switch opening, eliminate misoperation;Grounding system forms centralized grounding network, grounding resistance≤4Ω, ensure that grounding is reliable;Secondary line system realizes orderly wiring by station plate and wire sheath, secondary plug-in seat is convenient for maintenance;Electrical component includes circuit breaker, lightning arrester, current transformer etc., realize on-off control and overcurrent, overvoltage protection.The utility model solves the problem that existing outgoing line cabinet is poor in sealing, interlocking is unreliable, difficult to maintain, with good sealing, high safety, maintenance is convenient, the advantage that grounding is reliable, applicable to high-low voltage distribution system.

Description

Technical Field

[0001] This utility model relates to the field of power distribution equipment technology, and in particular to an outgoing line cabinet for high and low voltage power distribution systems, which can realize power distribution, on / off control and safety protection. It is suitable for power distribution networks in industrial plants, residential communities, commercial buildings and other scenarios, and provides a stable and safe power supply interface for subsequent electrical equipment. Background Technology

[0002] In power distribution systems, outgoing switchgear, as the core equipment connecting the main distribution network and terminal electrical equipment, directly affects the stability and operational safety of the distribution system. However, existing outgoing switchgear suffers from the following technical deficiencies in practical applications: Poor sealing performance: The joints of existing outgoing switch cabinets mostly use a single sealing ring or no special sealing structure. After long-term use, the sealing ring is prone to aging and failure, which allows external dust and moisture to enter the cabinet and adhere to the surface of electrical components such as circuit breakers and current transformers. This not only reduces the insulation performance of the components, but may also cause short circuit faults and shorten the service life of the equipment.

[0003] Low interlocking reliability: Traditional outgoing cabinet door interlocks and grounding interlocks are mostly designed independently and lack a linkage mechanism. For example, the rear door can still be opened when the grounding switch is not closed, or the front door can be opened at will when the circuit breaker is closed, which can easily lead to maintenance personnel accidentally touching live parts and pose a risk of electric shock. The clearance between the grounding switch and the interlocking shaft of some outgoing cabinets is too large, which can easily cause "false lock" phenomenon during operation, further increasing the safety risk.

[0004] The secondary wiring layout is chaotic: the secondary wiring (control circuit and signal circuit lines) of the existing outgoing cabinets are mostly laid directly inside the cabinet without a dedicated fixing structure and wire protection. The lines are easily tangled and worn, and a lot of time needs to be spent sorting the lines during later maintenance. Moreover, the insulation layer of the wires is easily damaged during disassembly and assembly, which affects the stability of the secondary circuit signals.

[0005] The grounding system is scattered: the grounding components of the existing outgoing cabinets (such as the grounding terminal of the surge arrester, the grounding of the cabinet shell, and the grounding of the secondary circuit) are mostly connected to the grounding electrode through independent conductors. The grounding path is scattered and has not formed a unified grounding network. Some grounding connection points have increased grounding resistance due to loose bolts, which cannot meet the grounding reliability requirements of the power system.

[0006] Poor maintenance convenience: The components of the existing outgoing cabinets (such as mounting plates and electrical components) are mostly connected by welding or fixing bolts. A large number of fasteners need to be removed during disassembly and assembly. Furthermore, there is a lack of clear markings and standardized assembly structures. Maintenance personnel need to be familiar with the structure of specific cabinet models in order to carry out their work, which increases the difficulty and time cost of maintenance.

[0007] To address the aforementioned issues, there is an urgent need to design an outgoing line cabinet that is reliably sealed, securely interlocked, has orderly wiring, stable grounding, and is easy to maintain, in order to meet the requirements of modern power distribution systems for equipment safety and operational efficiency. Utility Model Content

[0008] The purpose of this utility model is to overcome the shortcomings of existing outgoing line cabinets and solve the following core technical problems: Improve the cabinet's sealing performance to prevent external dust and moisture from entering and affecting electrical components; Optimize the interlocking system to achieve close linkage between door interlocking and grounding interlocking, and eliminate potential safety hazards caused by misoperation; Standardize the layout of secondary lines, add line crossing protection and fixing structures, and improve maintenance convenience; Integrate the grounding system to form a unified grounding network to ensure grounding reliability; Simplify the component assembly structure and use clear labeling to reduce maintenance difficulty.

[0009] To achieve the above objectives, this utility model provides an outgoing line cabinet, the core structure of which includes a cabinet body, a sealing structure, an interlocking system, a grounding system, a secondary wiring system, and electrical components. The specific design of each structure and component is as follows: cabinet structure The cabinet is a monolithic load-bearing frame, constructed using a combination of cold-rolled steel plate welding and bolt splicing to ensure structural strength; its components include: Side panel assembly: left front flat side panel, right front flat side panel, two right rear flat side panels and rear panel. The side panel thickness is 2.5mm, and the surface is treated with electrostatic powder coating, which has excellent corrosion resistance. Front panel assembly: left front flat front panel, right rear flat front panel, right front flat front panel, rear front panel and flat front panel. The front panel has reserved mounting holes for fixing terminal brackets and secondary plug-in sockets. Top cover assembly: top-entry flat top cover (suitable for top-entry scenarios), side-hole top cover assembly (suitable for side-exit scenarios), with reinforcing ribs on the inner side of the top cover to improve its resistance to deformation; Chassis assembly: cable chassis assembly (for cable entry), top-entry flat chassis assembly (for top entry), anti-slip pads are provided on the bottom of the chassis to prevent cabinet displacement; Guide rail assembly: lower-right guide rail assembly, left guide rail bracket, right guide rail bracket and guide rail fixing plate. The guide rail is made of galvanized steel plate with a surface smoothness ≤Ra0.8μm. A handcart is installed on the guide rail. The handcart is assembled with positioning pins to achieve precise positioning (positioning error ±0.5mm) to ensure reliable electrical connection between the handcart and the cabinet. Reinforced structure: including rear door reinforcement plate, continued front center folding plate, continued right center folding plate, continued rear folding plate, continued left rear upper folding plate and continued left rear lower folding plate; the rear door reinforcement plate is fixed to the inside of the rear door to enhance the load-bearing capacity of the rear door; each folding plate is fixed to the front center, right center, rear, left rear upper and left rear lower positions inside the cabinet to strengthen the internal support strength of the cabinet; Signage structure: Includes "Do Not Step On" door panels, lightning bolt symbol door panels, emergency unlock door panels, upper cabinet indicator signs, lower cabinet indicator signs, and marking frames; "Do Not Step On" door panels are placed at the bottom of the cabinet in easily stepped-on locations to warn against stepping; lightning bolt symbol door panels are placed on the door panels corresponding to live areas to indicate the risk of internal electrical contamination; emergency unlock door panels are placed on the outside of the front door for unlocking the front door in emergencies; upper cabinet indicator signs and lower cabinet indicator signs are placed at the top and bottom of the cabinet respectively to mark the functional areas of the cabinet; marking frames are used to label electrical parameters for easy identification by maintenance personnel. Lifting structure: The main body is a lifting ring bracket, with a total of 4 rings, which are fixed at the four corners of the top cover assembly for the lifting and transportation of the entire cabinet.

[0010] Sealed structure The cabinet employs a "double-seal" design to ensure an IP4X protection rating. Sealing at joints: Sealing gaskets are installed at the joints of the side panels, front panel, and rear panel of the cabinet with the top cover and chassis. The sealing gaskets are made of EPDM rubber (aging resistance temperature -40℃~120℃), and the compression is controlled at 30%~50% to ensure a sealing effect. Door panel sealing: All door panel assemblies in contact with the cabinet body are fitted with strip sealing rings. The sealing rings have a "U" shaped cross-section and an inner lip. When the door is closed, the lip fits tightly against the cabinet body to prevent dust and moisture from seeping in. The door panel assemblies include the front upper door panel assembly, front middle door panel assembly, front lower door panel assembly, rear upper door panel assembly, rear upper flat door panel assembly, rear lower door panel assembly, lower door, front door, rear door, left small upper door, right small upper door, left small lower door, right small lower door, front upper-opening door, front middle door, front lower door, and rear upper-flat door, covering all openable parts of the cabinet body to achieve full circumference sealing.

[0011] Interlocking system The "door-to-ground linkage" design enables multiple safety interlocks, preventing accidental operation. Door interlock assembly: includes interlock shaft, front door interlock welded parts, front door interlock rod, rear door grounding lock hook and rear door grounding lock block; when the circuit breaker is closed, the circuit breaker linkage pushes the lock hook to lock the front door interlock rod, and the front door cannot be opened; when the circuit breaker is opened, the lock hook is unlocked, and the front door can be opened; the rear door grounding lock block cooperates with the rear door grounding lock hook to realize the mechanical locking and unlocking of the rear door; Grounding interlock assembly: includes a double-pass grounding knife connecting plate assembly, three grounding stationary contacts (to ensure reliable grounding circuit), grounding knife, grounding interlock support, grounding interlock bracket, and grounding interlock pressure plate; the grounding interlock assembly is linked to the grounding switch operating shaft—when the operating shaft rotates clockwise, it drives the grounding knife and grounding stationary contact to close via a connecting rod, and at the same time, the interlock shaft unlocks the rear door; if the grounding knife is not closed, the interlock shaft presses against the rear door, and the rear door cannot be opened; the grounding interlock bracket is used to support and fix the grounding interlock components to ensure the coaxiality and stability of the interlock action; In addition, five sector plates limit the rotation angle of the grounding switch (maximum 90°) to prevent damage from excessive rotation; the limiting sleeve and the grounding interlocking bushing reduce wear on the interlocking shaft and extend service life; the grounding interlocking bushing is sleeved on the outside of the grounding interlocking rod to protect the rod from dust and moisture erosion and reduce wear during operation.

[0012] Grounding system The design adopts a "centralized grounding network," with all grounding components uniformly connected to the grounding electrode, and the grounding resistance ≤4Ω. Main grounding circuit: The grounding bolt (M12 galvanized bolt, located at the bottom of the cabinet) is the grounding starting point. The grounding device and secondary grounding device are connected to the grounding bolt through a 60×6mm copper busbar. The grounding plate (under the bracket) and the grounding busbar bracket are connected in series to form the main grounding busbar. Component grounding: The grounding terminal of the surge arrester is connected to the main grounding busbar through a 25mm² copper wire, the grounding terminal of the current transformer housing is connected to the main grounding busbar through a 16mm² copper wire, and the cabinet housing is connected to the main grounding busbar through bolts; the secondary circuit grounding is connected to the main grounding busbar through the secondary grounding busbar bracket to ensure that the secondary signal is not interfered with.

[0013] Secondary line system The design employs a "centralized layout + line protection" approach to ensure the orderly and safe operation of secondary wiring. Cabling carrier: The station board has a secondary cable channel, and the secondary cables (control and signal lines) are hidden inside the station board to avoid external collisions; Cable crossing protection: Two cable crossing sleeves (made of nylon) are installed at the cable crossing points on the front panel of the instrument compartment to prevent secondary cables from being worn by the metal edges; the folding plate is equipped with cross-shaped cable crossing holes with chamfered edges on the inside of the holes to further protect the wires; Connection structure: The secondary plug-in socket, horizontal secondary plug-in, and flat secondary plug-in are fixed on the mounting plate assembly, realizing "plug and unplug" of the secondary circuit, and no wires need to be disconnected during maintenance; The terminal brackets are fixed to the inside of the front panel, including the left front terminal bracket, the right front terminal bracket, the left rear terminal bracket, and the right rear terminal bracket. The secondary terminals are arranged according to "functional zones" (control terminals, signal terminals, power terminals) for easy wiring and maintenance. In addition, the micro switch bracket, the instrument room lighting bracket, and the secondary electromagnetic bracket respectively fix the micro switch, the lighting, and the secondary electromagnetic components to ensure that the secondary components are arranged in an orderly manner.

[0014] Electrical components Core electrical components are installed according to "functional zones" to ensure stable circuit operation: Main circuit components: Circuit breaker (molded case or universal type, selected according to rated current), outgoing phase copper busbar assembly (T2 copper, tin-plated surface), contact box (epoxy resin material, insulation class ≥10kV), wall bushing (for copper busbars to pass through the cabinet), insulators; the insulators are made of epoxy resin and are used to support and fix the main circuit copper busbars, ensuring the insulation distance between the copper busbars and the cabinet; surge arresters are connected to the phase busbars via surge arrester copper busbars to achieve overvoltage protection; current transformers (transformation ratio selected according to actual needs) are assembled in series with the outgoing phase copper busbars for current detection; Monitoring and control components: A live indicator is connected to the copper busbar via a contact box to display the real-time energization status inside the cabinet (red light indicates energization, green light indicates de-energization); an ammeter is connected in parallel with a current transformer to display the real-time current; protection devices (including overcurrent, overload, and short-circuit protection functions) are linked to the circuit breaker and automatically trip in case of a fault; a heater (200W power) is installed at the bottom of the cabinet and automatically starts in humid environments to prevent condensation inside the cabinet; an auxiliary switch is linked to the circuit breaker mechanism for signal switching and status feedback of the auxiliary circuit, enabling reliable transmission of interlocking signals; Operating components: Red button (opening button), green button (closing button), red light (closing indicator), yellow light (fault indicator), green light (opening indicator), and knob (manual / automatic switch) are installed on the front upper panel for easy operation; the changeover switch is connected to the secondary circuit via a changeover cable to realize secondary signal switching.

[0015] The working process of this utility model's outgoing line cabinet covers five core aspects: power distribution control, sealing protection, interlocking protection, grounding protection, and secondary monitoring. The specific principles are as follows: Power distribution control process Line entry stage: Select the line entry method according to the installation scenario - when entering the cable, open the lower door, introduce the external cable into the cabinet through the cable tray assembly, fix the cable with cable clamps (2), and crimp the cable joint with the inlet and outlet lines; when entering the cable from the top, introduce the cable through the upper flat bottom assembly and connect it with the inlet and outlet lines. Main circuit conduction: Operate the green button, the protection device sends a closing signal, the moving contact and stationary contact of the circuit breaker close, and the current flows sequentially through the incoming and outgoing phases → circuit breaker → outgoing phase copper busbar assembly → current transformer → wall bushing → external electrical equipment to realize power supply; Fault protection: When an overcurrent or short-circuit fault occurs on the line, the current transformer will transmit the detected high current signal to the protection device. After analysis, the protection device will issue a trip signal, and the circuit breaker will automatically trip to disconnect the main circuit. At the same time, a yellow light will illuminate to indicate the fault. Overvoltage protection: When an overvoltage occurs in the power grid (such as lightning strikes or switching overvoltages), the surge arrester breaks down and discharges, introducing the overvoltage into the grounding system to protect components such as circuit breakers and current transformers from overvoltage damage.

[0016] Sealing and protection principle The sealing gasket assembly at the cabinet joints fills the gaps through compression deformation, preventing dust and moisture from seeping in from the top, bottom, and sides of the cabinet. The U-shaped cross-section design of the strip sealing ring at the contact point between the door panel and the cabinet ensures that the lip is squeezed tightly against the cabinet surface when the door is closed, forming an "elastic sealing surface." Even if the sealing ring ages over a long period of use, the lip can still maintain a certain sealing capacity, ensuring that the electrical components inside the cabinet are in a dry and clean environment.

[0017] Interlocking protection principle To prevent opening the door while it is energized: When the circuit breaker is closed, its internal linkage pushes the locking block on the front door interlocking rod, causing the locking hook to lock the interlocking rod, preventing the front door from being opened and avoiding maintenance personnel from accidentally contacting the energized copper busbar; only after the circuit breaker is opened by operating the red button, the linkage resets, the locking hook unlocks, and the front door can be opened. To prevent opening the door without grounding: Before opening the rear door, the grounding switch operating shaft must be rotated clockwise. This will cause the grounding knife to close with the grounding stationary contact via the connecting rod, thus connecting the grounding circuit. At the same time, the grounding knife connecting plate assembly will push the interlocking shaft down, releasing the lock on the rear door. If the grounding switch is not operated, the interlocking shaft will remain pressed against the rear door, preventing the door from opening and eliminating the safety hazard of "maintenance without grounding".

[0018] Grounding protection principle All components requiring grounding (surge arresters, current transformers, cabinet casing, secondary circuits) are connected to the main grounding busbar via copper busbars or wires, forming a grounding network of "multi-point grounding and unified return current". During normal operation, the grounding system introduces the induced charge on the cabinet shell and the interference signals from the secondary circuit to the ground, ensuring the stable operation of electrical components; In the event of a fault (such as when the copper busbar insulation is damaged, causing the cabinet to become energized), the grounding system will quickly conduct the fault current to the ground, bringing the cabinet's outer casing potential close to the ground potential to prevent maintenance personnel from being electrocuted. At the same time, the fault current will trigger the protection device, causing the circuit breaker to trip and disconnect the fault circuit.

[0019] Secondary monitoring principle Live monitoring: The live indicator collects the voltage signal of the copper busbar through the contact box. When the copper busbar is energized, the internal circuit of the indicator is connected and the red light is on, indicating that the cabinet is energized; when there is no power, the green light is on, ensuring that maintenance personnel can carry out work in a "no power state". Current monitoring: The current transformer converts the large current in the main circuit into a small current (usually 5A) according to the transformation ratio, and transmits it to the ammeter. The ammeter displays the line current in real time, and maintenance personnel can judge the line load by using the ammeter. Status indication: The red light is linked to the circuit breaker's closed status; when the circuit breaker is closed, the red light illuminates. The green light is linked to the circuit breaker's open status; when the circuit breaker is open, the green light illuminates. The yellow light is linked to the protection device's fault signal; when a fault occurs, the circuit breaker opens and the yellow light illuminates, facilitating quick location of the fault status. Beneficial effects

[0020] Excellent sealing performance: The double sealing structure (sealing gasket + strip sealing ring) enables the cabinet to achieve an IP4X protection level, effectively isolating dust and moisture, extending the life of electrical components by more than 30%, and reducing failures caused by environmental factors. High safety and reliability: The door-to-ground interlocking system eliminates two core safety hazards: "opening the door while it is energized" and "maintenance without grounding". The live indicator displays the live status in real time, and the grounding system ensures personnel safety in case of a fault. It complies with the safety requirements of GB7251.1-2013 "Low-voltage switchgear and controlgear assemblies - Part 1: General". Highly convenient to maintain: Secondary lines are centrally located inside the station plate, with wire sheaths protecting the conductors, and secondary plug-in sockets allow for "plug-and-play" operation, reducing maintenance time by 50%; components are assembled via mounting plates and guide rails, eliminating the need for welding during disassembly and assembly, and standardized markings facilitate quick identification of component functions. Stable and reliable grounding: The centralized grounding network ensures that the grounding resistance is ≤4Ω, meeting the grounding requirements of the power system and avoiding secondary signal interference or equipment damage caused by poor grounding; High versatility: It is suitable for various installation scenarios such as cable inlet / top inlet, side outlet / top outlet, etc. The handcart design facilitates the replacement of core components such as circuit breakers, and can meet the needs of different power distribution capacities (100A~2500A), with a wide range of applications. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3This is a schematic diagram of the structure of this utility model; Figure 4 This is a schematic diagram of the internal structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-6 As shown, a type of outgoing line cabinet.

[0024] In this implementation plan: To solve the technical problems existing in the prior art, such as the "poor sealing performance" disclosed in the background technology above: the cabinet splicing of existing outgoing cabinets mostly adopts a single sealing ring or no special sealing structure. After long-term use, the sealing ring is prone to aging and failure, which leads to the entry of external dust and moisture into the cabinet and adheres to the surface of electrical components such as circuit breakers and current transformers. This not only reduces the insulation performance of the components, but may also cause short circuit faults and shorten the service life of the equipment.

[0025] Low interlocking reliability: Traditional outgoing cabinet door interlocks and grounding interlocks are mostly designed independently and lack a linkage mechanism. For example, the rear door can still be opened when the grounding switch is not closed, or the front door can be opened at will when the circuit breaker is closed, which can easily lead to maintenance personnel accidentally touching live parts and pose a risk of electric shock. The clearance between the grounding switch and the interlocking shaft of some outgoing cabinets is too large, which can easily cause "false lock" phenomenon during operation, further increasing the safety risk.

[0026] The secondary wiring layout is chaotic: the secondary wiring (control circuit and signal circuit lines) of the existing outgoing cabinets are mostly laid directly inside the cabinet without a dedicated fixing structure and wire protection. The lines are easily tangled and worn, and a lot of time needs to be spent sorting the lines during later maintenance. Moreover, the insulation layer of the wires is easily damaged during disassembly and assembly, which affects the stability of the secondary circuit signals.

[0027] The grounding system is scattered: the grounding components of the existing outgoing cabinets (such as the grounding terminal of the surge arrester, the grounding of the cabinet shell, and the grounding of the secondary circuit) are mostly connected to the grounding electrode through independent conductors. The grounding path is scattered and has not formed a unified grounding network. Some grounding connection points have increased grounding resistance due to loose bolts, which cannot meet the grounding reliability requirements of the power system.

[0028] Poor maintenance convenience: The components of existing outgoing cabinets (such as mounting plates and electrical components) are mostly connected by welding or fixing bolts. Disassembly and assembly require the removal of a large number of fasteners, and there is a lack of clear markings and standardized assembly structure. Maintenance personnel need to be familiar with the structure of specific cabinet models in order to carry out their work, which increases the difficulty and time cost of maintenance. In terms of actual use, this problem is obviously a real and difficult problem to solve. Therefore, in order to solve this technical problem, an outgoing cabinet is provided. Example

[0029] like Figure 1-6 As shown: Component preparation Prepare all components according to the design requirements, and focus on checking the performance of key components: The sealing gasket assembly 1 and the strip sealing ring 8 must be free from damage and aging, and the EPDM rubber material must comply with GB / T5574-2008 standard; Circuit breakers and protection devices must undergo power-on testing to ensure reliable opening and closing operations and normal protection functions. The contact surfaces of the grounding stationary contact 44 and the grounding knife 47 must be flat, with no peeling of the silver plating layer, and the contact resistance ≤50mΩ; Copper busbars (such as surge arrester copper busbars and phase busbars) need to be acid-washed and tin-plated, and the surface should be free of oxidation and scratches.

[0030] Cabinet assembly Chassis and side panel assembly: Place the cable chassis assembly 14 or the upper flat chassis assembly 15 on a level surface, and connect the left front flat side panel 11, right front flat side panel 12, right rear flat side panel 13, and rear panel 22 to the chassis with M10 bolts, controlling the bolt torque at 25 N·m; attach the sealing gasket assembly 1 at the joint between the side panel and the chassis, ensuring that the sealing gasket completely covers the gap; Front panel and top cover assembly: Connect the front panel assembly (left front flat front panel 80, right rear flat front panel 81, right front flat front panel 82, rear front panel 83 and flat front panel 84) to the side panels with bolts. Install terminal brackets 104-107 on the inside of the front panel. The installation height error of the terminal brackets is ≤1mm. Then install the top cover assembly (upper flat top cover 16 / side hole top cover assembly 17). At the joint between the top cover and the side panel, the sealing gasket assembly 1 is also pasted and fixed with M8 bolts. The bolt spacing is ≤200mm. Strengthen the installation: Weld the rear door reinforcement plate to the inside of the rear door 67. Continue - front middle folding plate, continue - right middle folding plate, continue - rear folding plate, continue - left rear upper folding plate, continue - left rear lower folding plate are fixed to the corresponding positions inside the cabinet with bolts. The contact surface between the folding plate and the cabinet body needs to be coated with anti-rust paint to prevent corrosion. Signage installation: Connect the "Do Not Step On" door panel, lightning symbol door panel, and emergency unlock door panel to the cabinet via hinges. Affix the upper cabinet indicator signs and lower cabinet indicator signs to prominent positions on the upper and lower parts of the cabinet. Mark the cabinet model, rated current, protection level, and other parameters in the marking box. Installation of the hoisting structure: Fix the four lifting ring brackets 101 to the four corners of the top cover assembly, tighten the fixing bolts, and ensure that the hoisting force is even.

[0031] Guide rail and handcart assembly The guide rail fixing plate 116 is fixed to the chassis assembly 14 / 15 by M8 bolts, and the horizontality error of the guide rail fixing plate 116 is ≤0.5mm / m; Install the lower-right guide rail assembly 23, the left guide rail bracket 109, and the right guide rail bracket 110 onto the guide rail fixing plate 116. The parallelism error between the guide rails is ≤0.3mm. Install the sliding plate 158 and the lower sliding plate 159 at the bottom of the handcart 54. Place the handcart 54 on the guide rail and push the handcart 54 to test the smoothness of sliding (resistance ≤ 50N). Adjust the positioning pin assembly 38 to ensure that when the handcart 54 is pushed to the "working position", the positioning pin automatically pops out and locks the handcart 54.

[0032] Interlocking system assembly Grounding interlock assembly installation: The double-pass grounding knife connecting plate assembly 39 is fixed to the inside of the rear plate 22 with bolts. The grounding stationary contact seats 44 (3 in total) are evenly distributed on one side of the connecting plate. The grounding knife 47 is hinged to the connecting plate. The grounding switch operating shaft 41 passes through the cabinet side plate and is connected to the grounding knife 47 through the connecting rod 46. When the operating shaft is rotated, the grounding knife 47 should be able to smoothly close / separate from the grounding stationary contact seat 44. Install a fan-shaped plate 148 on one side of the grounding knife 47 to limit the maximum rotation angle of the grounding knife 47 to 90°. Install the grounding interlock support 143, the grounding interlock bracket, and the grounding interlock pressure plate 145 to ensure the coaxiality of all components. Door interlock assembly installation: The front door interlock welding piece 192 is welded to the inside of the front door 66. One end of the front door interlock rod 154 is hinged to the welding piece, and the other end cooperates with the rear door grounding knife lock hook 162. The rear door grounding knife lock block is installed correspondingly to the lock hook to achieve locking cooperation. The lock hook is fixed inside the cabinet by the bracket and is linked with the circuit breaker's linkage. The rear door interlock assembly 186 is connected to the grounding knife connecting plate assembly 39. The interlock shaft 40 passes through the rear door 67. When the grounding knife is closed, the interlock shaft 40 moves down to unlock the rear door 67. When the grounding knife is open, the interlock shaft 40 moves up to press against the rear door 67. Limiting sleeves 150 are installed on the outside of the interlock shafts 40 and 79, and grounding interlock shaft sleeves 151 are installed on the outside of the grounding interlock rod to reduce wear during operation. Interlocking test: Operate the circuit breaker and grounding switch multiple times to check the door interlocking function. When the circuit breaker is closed, the front door 66 cannot be opened; when the grounding switch is open, the rear door 67 cannot be opened. Only after the function is normal can you proceed to the next step.

[0033] Grounding system assembly Grounding bolt 9 is welded to the bottom of the cabinet. Grounding device 34 and secondary grounding device 33 are connected to grounding bolt 9 through 60×6mm copper busbars. The copper busbar connection is bolted and the crimping surface is coated with conductive paste to reduce contact resistance. Grounding plate 115 is fixed to the lower side of the bracket and connected to the main grounding busbar through a 16mm² copper wire; grounding busbar bracket 103 and secondary grounding busbar bracket 97 are fixed inside the cabinet in sequence to form a grounding network. The grounding terminals of the surge arrester and current transformer are connected to the main grounding busbar via 25mm² and 16mm² copper wires, respectively, and the cabinet shell is connected to the main grounding busbar via M8 bolts. Grounding resistance test: Use a grounding resistance tester to measure the grounding resistance of the grounding system and ensure that it is ≤4Ω. If the resistance exceeds the standard, it is necessary to add a grounding electrode or replace it with a copper busbar with a larger cross-section.

[0034] Secondary wiring and electrical component assembly Electrical component installation: Circuit breakers and protection devices are fixed to the "main circuit area" inside the cabinet via mounting plate 85; surge arresters are connected to the phase busbars via surge arrester copper busbars; current transformers are assembled in series with the outgoing phase copper busbars; live indicators are connected to the copper busbars via contact boxes; ammeters are connected in parallel with current transformers; heaters are installed at the bottom of the cabinet and controlled by a temperature control switch (starting when the temperature is below 5℃ and stopping when the temperature is above 25℃); insulators support and fix each section of copper busbars to ensure insulation distance; auxiliary switches are linked to the circuit breaker mechanism and connected to the auxiliary control circuit; transfer switches are connected to the secondary circuit via transfer cables. Secondary wiring: Secondary wiring (control and signal lines) is arranged inside the station plate 50 according to "functional zones". A cable pass-through sleeve 49 is installed at the cable passage points on the instrument room front panel. Secondary plug-in sockets 183, horizontal secondary contacts 20, and flat secondary contacts 21 are fixed to the mounting plate assembly 18. Secondary wiring terminals are arranged as "control terminals (left front terminal bracket 104), signal terminals (right front terminal bracket 105), and power terminals (left rear terminal bracket 106, right rear terminal bracket 107)", with terminal numbers consistent with the drawings. Microswitch brackets, instrument room lighting brackets, and secondary electromagnetic brackets are respectively fixed to their corresponding secondary components to ensure an orderly layout. Secondary circuit test: Connect the secondary power supply and test the functions of the live indicator (red light when the copper busbar is energized, green light when there is no power), indicator lights (red light 166 for closing, green light 168 for opening, yellow light 167 for fault), and buttons (red button 164 for opening, green button 165 for closing) to ensure normal transmission of secondary signals.

[0035] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A type of outgoing line cabinet, characterized in that, The system includes a cabinet, a sealing structure, an interlocking system, a grounding system, a secondary wiring system, and electrical components. The cabinet includes a side panel assembly, a front panel assembly, a rear panel (22), a top cover assembly, a chassis assembly, and a guide rail assembly. The side panel assembly includes a left front flat side panel (11), a right front flat side panel (12), and at least two right rear flat side panels (13). The front panel assembly includes a left front flat front panel (80), a right rear flat front panel (81), a right front flat front panel (82), a rear front panel (83), and a flat front panel (84). The top cover assembly includes an upper-entry flat top cover (16) and a side-hole top cover assembly (17). The chassis assembly includes a cable chassis assembly (14) and an upper-entry flat chassis assembly (15). The guide rail assembly includes a lower-right guide rail assembly (23). The left guide rail bracket (109), the right guide rail bracket (110), and the guide rail fixing plate (116) are provided with a sliding handcart (54), which is positioned by a positioning pin assembly (38); the sealing structure includes a sealing gasket assembly (1) set at each splice of the cabinet and a strip sealing ring (8) set at the contact part between the door panel assembly and the cabinet; the door panel assembly includes a front upper door panel assembly (26), a front middle door panel assembly (27), a front lower door panel assembly (28), a rear upper door panel assembly (29), a rear upper flat door panel assembly (31), a rear lower door panel assembly (32), a lower door (65), a front door (66), a rear door (67), a left small upper door (68), a right small upper door (69), and a left small lower door. The system includes a panel door (70), a right small lower panel door (71), a front upper-opening door (127), a front middle door (128), a front lower door (129), and a rear upper-flat door (130); the interlocking system includes a door interlocking assembly and a grounding interlocking assembly. The door interlocking assembly includes an interlocking shaft (40, 79), a front door interlocking welded part (192), a front door interlocking rod (154), a rear door grounding knife lock hook (162), and a rear door grounding knife lock block. The grounding interlocking assembly includes a double-pass grounding knife connecting plate assembly (39), a grounding stationary contact seat (44), a grounding knife (47), a grounding interlocking support (143), a grounding interlocking bracket, and a grounding interlocking pressure plate (145). The grounding interlocking assembly is linked with the grounding switch operating shaft (41); the grounding system includes a grounding screw. The system includes a grounding bolt (9), a grounding device (34), a secondary grounding device (33), a grounding plate (115), a grounding busbar bracket (103), and a secondary grounding busbar bracket (97). The grounding device (34), the secondary grounding device (33), and the grounding plate (115) are all connected to the grounding bolt (9) via copper busbars. The secondary wiring system includes a station plate (50) with internal secondary wiring, a cable sheath (49) on the front panel of the instrument room, a secondary plug-in socket (183), a horizontal secondary plug-in (20), a flat secondary plug-in (21), and terminal brackets (104-107). The terminal brackets (104-107) include a left front terminal bracket (104), a right front terminal bracket (105), a left rear terminal bracket (106), and a right rear terminal bracket (107).The electrical components include circuit breakers, protection devices, surge arresters, current transformers, live indicators, outgoing phase copper busbar assemblies, contact boxes, and auxiliary switches. The surge arresters are connected to the phase busbars via surge arrester copper busbars. The current transformers are connected in series with the outgoing phase copper busbar assemblies. The live indicators are connected to the copper busbars via contact boxes.

2. The outgoing line cabinet according to claim 1, characterized in that, The cabinet also includes a reinforcing structure, which includes a rear door reinforcing plate, a front-middle folding plate, a right-middle folding plate, a rear folding plate, a left-upper rear folding plate, and a left-lower rear folding plate. The rear door reinforcing plate is fixed to the inside of the rear door (67), and the folding plates are respectively fixed to the front, right, rear, and left rear parts inside the cabinet.

3. The outgoing line cabinet according to claim 1, characterized in that, The electrical components also include an ammeter, a heater, an insulator, a changeover switch, and a changeover cable. The ammeter is connected in parallel with a current transformer. The heater is installed at the bottom of the cabinet. The insulator is used to support the copper busbar. The changeover switch is connected to the secondary circuit via a changeover cable.

4. The outgoing line cabinet according to claim 1, characterized in that, The interlocking system also includes a sector plate (148), a limiting sleeve (150), and a grounding interlocking bushing (151). The sector plate (148) is located on one side of the grounding knife connecting plate assembly (39) and is used to limit the rotation angle of the grounding knife (47). The limiting sleeve (150) is sleeved on the outside of the interlocking shaft (40, 79), and the grounding interlocking bushing (151) is sleeved on the outside of the grounding interlocking rod.

5. The outgoing line cabinet according to claim 1, characterized in that, The cabinet is also equipped with an identification structure, which includes a "Do Not Step On" door panel, a lightning symbol door panel, an emergency unlock door panel, an upper cabinet indicator, a lower cabinet indicator, and a marking frame. The "Do Not Step On" door panel is located at the bottom of the cabinet in an easily stepped position. The lightning symbol door panel is located on the door panel corresponding to the live area. The emergency unlock door panel is located on the outside of the front door (66). The upper cabinet indicator and the lower cabinet indicator are located on the upper and lower parts of the cabinet, respectively. The marking frame is used to mark electrical parameters.

6. The outgoing line cabinet according to claim 1, characterized in that, The secondary line system also includes a micro switch bracket, an instrument room lighting bracket, and a secondary electromagnetic bracket. The micro switch bracket is used to fix the micro switch, the instrument room lighting bracket is used to fix the instrument room lighting, and the secondary electromagnetic bracket is used to fix the secondary electromagnetic components.

7. The outgoing line cabinet according to claim 1, characterized in that, The cabinet is also provided with a hoisting structure, which is a hoisting ring bracket (101). The hoisting ring bracket (101) is fixed to the top of the top cover assembly. There are 4 hoisting ring brackets (101), which are respectively set at the four corners of the top cover assembly.

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