Construction method for replacing high-level cable well busbar without power interruption and cable distribution box

Abstract

The application discloses a high-rise cable shaft busbar non-power-off replacement construction method and a cable distribution box, relates to the technical field of low-voltage power distribution construction, and comprises the following steps: providing a power generation vehicle as a temporary power supply, and deploying cable distribution boxes in stairwells of each floor of a high-rise building; leading out a main cable from the power generation vehicle, longitudinally laying the main cable along a corridor, and connecting the main cable to incoming wire ends of the cable distribution boxes of each floor; in each cable distribution box, distributing power led in by the main cable to each branch outgoing loop through an incoming wire total control unit via a main busbar and a total circuit breaker; leading out branch cables from each branch outgoing loop of each cable distribution box, and connecting the branch cables to user meter boxes of corresponding floors, so as to form a temporary power supply loop; when it is confirmed that the temporary power supply loop normally supplies power, disconnecting the connection between original busbars in cable shafts and the user meter boxes, and replacing the original busbars. The application solves the technical problem of low construction efficiency in high-rise residential shaft busbar replacement construction.

Description

Technical Field

[0001] This application relates to the field of low-voltage power distribution construction technology, and in particular to a method for replacing busbars in high-rise cable wells without power interruption and a cable distribution box. Background Technology

[0002] The power shafts in high-rise residential buildings are the main channels for low-voltage power supply. The power busbars inside the shafts bear the core function of power transmission and distribution for the entire building. Due to factors such as the increasing age of the building, the continuous increase in load, the humid environment, and the aging of insulation materials, the busbar devices in the power shafts of high-rise residential buildings are prone to defects such as insulation layer damage, joint overheating, and excessive contact resistance, requiring regular inspection, maintenance, and replacement. In related technologies, the replacement of busbars in high-rise residential building shafts mainly adopts two conventional methods: one is to carry out full-time power outage construction for the entire building or unit. Before construction, power outage plan approval and dispatch approval procedures must be completed. During construction, a full set of safety measures such as power outage, voltage testing, grounding, and tagging must be implemented. Power supply is restored item by item after the busbar replacement is completed. The second method is to directly connect the generator truck to the meter boxes on each floor, that is, without setting up intermediate power distribution nodes, and cables are led out from the output end of the generator truck to connect and supply power to each meter box one by one.

[0003] However, both of the above-mentioned conventional methods have significant shortcomings. The power outage construction method disrupts basic living amenities such as residents' daily lighting, household appliances, secondary water supply, elevator operation, security monitoring, and low-voltage networks, resulting in poor power supply reliability. Furthermore, the construction preparation process is cumbersome, effective working time is limited, and construction efficiency is low. The method of directly connecting the generator truck to the meter box suffers from poor economic efficiency due to the large amount of cabling and laying work, insufficient safety control due to the messy laying of parallel cables, low wiring reliability due to the large number of parallel terminals at the generator truck's output end, and difficulties in construction organization and load management due to the dispersed work sites and the lack of unified monitoring. These issues contribute to the low efficiency of replacing the vertical shaft busbars in high-rise residential buildings. Summary of the Invention

[0004] The main purpose of this application is to provide a method for replacing the busbar in a high-rise cable well without power interruption and a cable distribution box, which aims to solve the technical problem of low construction efficiency in replacing the busbar in the vertical shaft of a high-rise residential building.

[0005] To achieve the above objectives, this application proposes a method for replacing the busbar of a high-rise cable well without power interruption, the method comprising: Provide generator trucks as temporary power sources and deploy cable distribution boxes in the stairwells of each floor of the high-rise building; The main cable is led out from the generator car and laid longitudinally along the corridor, and the main cable is connected to the inlet terminal of the cable distribution box on each floor. Inside each of the cable distribution boxes, the power introduced by the main cable is distributed to each branch outgoing circuit via the main busbar and the main circuit breaker through the incoming line control unit. Branch cables are drawn from each branch outgoing circuit of each of the aforementioned cable distribution boxes, and the branch cables are respectively connected to the user meter boxes on the corresponding floors to form a temporary power supply circuit. Once it is confirmed that the temporary power supply circuit is operating normally, disconnect the original busbar in the cable well from each user's meter box and replace the original busbar.

[0006] In one embodiment, the cable distribution box on each floor is fixed to the wall of the corresponding stairwell via wall-mounting holes on its back, and one cable distribution box is independently deployed on each floor.

[0007] In one embodiment, the cross-sectional area of ​​the trunk cable is 185mm². 2 Up to 240mm 2 The main cable is connected to the incoming line control unit through a high-current copper terminal block.

[0008] In one embodiment, the cross-sectional area of ​​the branch cable is 10mm. 2 Up to 35mm 2 The branch cable is connected to the branch outgoing circuit via a dedicated crimp terminal.

[0009] In one embodiment, the load of each branch outgoing circuit is evenly distributed by adjusting the corresponding outgoing circuit breaker; when any of the branch outgoing circuits fails, the outgoing circuit breaker of the faulty outgoing circuit is independently disconnected for isolation, while the remaining branch outgoing circuits maintain normal power supply.

[0010] In one embodiment, during the busbar replacement construction, wiring and power outage operations are all performed at the cable distribution box in the stairwell of each floor; the door of the cable distribution box is equipped with a lock, and the door remains locked during non-operational periods.

[0011] In one embodiment, during the busbar replacement construction, the load adjustment and fault diagnosis of each branch circuit are carried out by the outgoing circuit breaker of each cable distribution box, so as to avoid operating each floor's user meter box one by one.

[0012] Furthermore, to achieve the above objectives, this application also proposes a cable distribution box for uninterrupted power-off replacement of busbars in high-rise cable wells, the cable distribution box comprising: The enclosure is made of cold-rolled steel plate in one piece, with an electrostatic powder coating anti-corrosion layer on the surface. It has wall-mounting holes on the back, a carrying handle on the top, and knock-out cable entry / exit holes on the top and bottom sides. The door is equipped with a lock. The incoming line control unit is located inside the enclosure and includes a three-phase main incoming line circuit, a main circuit breaker, and high-current copper terminals and a main busbar that are connected sequentially along the incoming line direction. The main circuit breaker has overload protection and short-circuit protection functions. The high-current copper terminals are used to connect to the main cable led out from the generator car. The area of ​​the incoming line control unit is equipped with phase sequence markings. The outgoing line distribution unit, arranged in parallel along the main busbar within the enclosure, includes multiple branch outgoing line circuits. Each branch outgoing line circuit is independently equipped with an outgoing line circuit breaker and a dedicated terminal block. The dedicated terminal block is used to connect the branch cable supplying power to the user's meter box. The outgoing line distribution unit also includes a neutral busbar and a protective ground busbar, which are independent of the main busbar. The neutral, ground, and phase wires are arranged in layers. Each branch outgoing line circuit has reserved identification positions for marking the corresponding meter box number and phase sequence. The safety protection unit includes an insulating protective cover covering the live busbars and terminals inside the enclosure, a dedicated grounding bolt on the enclosure, and a system wiring diagram and safety operation instructions posted on the inside of the enclosure door.

[0013] Preferably, the enclosure door is provided with a transparent observation window, the position of which corresponds to the open / closed status indication area of ​​the circuit breakers inside the enclosure, so as to view the open / closed status of each circuit breaker without opening the enclosure door.

[0014] Preferably, the number of branch outgoing circuits in the outgoing distribution unit is configured according to the number of meter boxes on the corresponding floor; the main circuit breaker is a three-phase circuit breaker, and each outgoing circuit breaker is a single-phase circuit breaker or a three-phase circuit breaker.

[0015] One or more technical solutions proposed in this application have at least the following technical effects: Compared to conventional methods in related technologies that require full-time power outages for construction of the entire building or unit, necessitate prior approval of power outage plans and dispatching procedures, and require the implementation of a full set of safety measures during construction, with effective working hours restricted by residents' schedules, this application provides a generator truck as a temporary power source and deploys cable distribution boxes in the stairwells of each floor of the high-rise building. A main cable is led out from the generator truck and laid longitudinally along the stairwells, connecting to the inlet terminals of the cable distribution boxes on each floor. Inside each cable distribution box, the power introduced by the main cable is distributed to each branch outgoing circuit via the main busbar and main circuit breaker through the incoming line control unit. Branch cables are led out from each branch outgoing circuit of each cable distribution box and connected to the corresponding user meter boxes on each floor to form a temporary power supply circuit. When the temporary power supply circuit is confirmed to be operating normally, the connection between the original busbar in the cable well and each user meter box is disconnected, and the original busbar is replaced. Understandably, this application employs a technical approach of first constructing a temporary power supply circuit, confirming its normal operation, and then disconnecting the original busbar from each user's meter box before replacing it. This ensures continuous power supply to each user's meter box throughout the entire busbar replacement process, allowing the replacement to be completed without power outages. Therefore, based on the continuous power supply guarantee provided by the temporary power supply circuit, construction personnel do not need to obtain power outage plan approvals, wait for residents' rest periods, or implement power outage safety measures and restoration procedures step by step. This allows for independent control of the construction time window by the workers, ensuring continuous and uninterrupted construction, ultimately completing the original busbar replacement and guaranteeing uninterrupted power supply to users throughout the entire process. This solves the technical problem of low construction efficiency in conventional high-rise residential building vertical shaft busbar replacement construction. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating the embodiment of the construction method for replacing the busbar in a high-rise cable well without power interruption in this application; Figure 2 A schematic diagram of the cable distribution box wiring method provided in the embodiment of the construction method for replacing the busbar of a high-rise cable well without power interruption in this application; Figure 3This is a schematic diagram of the cable distribution box structure provided for the embodiment of the construction method for replacing the busbar in a high-rise cable well without power interruption in this application.

[0019] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0021] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The main solution in this application's embodiments is: Provide generator trucks as temporary power sources and deploy cable distribution boxes in the stairwells of each floor of the high-rise building; The main cable is led out from the generator car and laid longitudinally along the corridor, and the main cable is connected to the inlet terminal of the cable distribution box on each floor. Inside each of the cable distribution boxes, the power introduced by the main cable is distributed to each branch outgoing circuit via the main busbar and the main circuit breaker through the incoming line control unit. Branch cables are drawn from each branch outgoing circuit of each of the aforementioned cable distribution boxes, and the branch cables are respectively connected to the user meter boxes on the corresponding floors to form a temporary power supply circuit. Once it is confirmed that the temporary power supply circuit is operating normally, disconnect the original busbar in the cable well from each user's meter box and replace the original busbar.

[0023] In this embodiment, the application takes the high-rise cable well busbar uninterrupted replacement construction device as the main body, and for ease of description, it will be referred to as "device" for specific description.

[0024] Because the replacement of the busbar in the vertical shaft of high-rise residential buildings requires a full-time power outage for the entire building or unit, the power outage plan approval and dispatch approval procedures must be completed before construction. During construction, a full set of safety measures such as power outage, voltage testing, grounding, and tagging must be implemented, and the effective working time is limited by residents' work and rest, resulting in low construction efficiency. On the other hand, the method of directly connecting the generator truck to the meter box requires laying cables for each meter box individually. The work points are scattered and the wiring is large, which also has the problem of low construction organization efficiency.

[0025] This application provides a solution that uses a generator truck as a temporary power source. Cable distribution boxes are deployed in the stairwells of each floor of a high-rise building. Power is transmitted to each distribution box via a main cable laid longitudinally along the stairwell. Each distribution box then connects to the corresponding user meter boxes on the nearest floor via branch cables. After confirming that the temporary power supply circuit is operating normally, the original busbar is disconnected from the meter box and the busbar is replaced. This solution constructs a three-level power distribution link between the generator truck and the user meter boxes: "main cable - floor distribution box - branch cable." This transforms the traditional centralized long-distance single-point wiring into a distributed, nearby access layer by layer. It simplifies the construction of the temporary power supply circuit from parallel multi-point work at each meter box to centralized work at each distribution box, significantly reducing the workload of cable laying and wiring operation time. Moreover, after the temporary power supply circuit is energized, the original busbar can be replaced without user load, without the need for power outage plan approval procedures, waiting for residents' rest windows, or implementing power outage safety measures and power restoration operations one by one. The construction time window is controlled by the operators, and the construction process can proceed continuously without interruption.

[0026] This embodiment aims to solve the technical problems of low construction efficiency caused by the lengthy power outage approval process, limited effective working time, and difficulties in organizing multi-point dispersed operations during conventional vertical shaft busbar replacement construction. In this embodiment, the research background is the practical needs of high-rise residential buildings with limited space in the power shafts, meter boxes scattered across different floors, and the inability of conventional power outage construction and direct connection to generator trucks to simultaneously achieve uninterrupted construction and efficient operation. The application scenario is the periodic replacement and maintenance of busbars in cable shafts of high-rise residential buildings, especially in construction environments where residents are living normally and long-term, continuous power outages are not feasible. Through the aforementioned three-level power distribution architecture and layer-by-layer deployment strategy, continuous power is maintained on the user side and continuous progress is made on the work side during the busbar replacement construction, achieving efficient construction under uninterrupted power conditions, and significantly improving construction efficiency compared to conventional power outage construction methods.

[0027] Based on this, the embodiments of this application provide a method for replacing the busbar of a high-rise cable well without power interruption, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the construction method for replacing the busbar of a high-rise cable well without power interruption in this application.

[0028] In this embodiment, the method for replacing the busbar of the high-rise cable well without power interruption includes steps S10 to S50: Step S10: Provide a generator truck as a temporary power source and deploy cable distribution boxes in the stairwells of each floor of the high-rise building. It should be noted that a generator truck refers to a mobile power supply vehicle equipped with a diesel generator set and a power output interface. Its output end leads to a main cable to provide temporary power to the cable distribution boxes on each floor. The capacity of the generator truck is determined according to the total load demand on site, including but not limited to conventional 500 kW to 1000 kW medium and low voltage generator trucks. A cable distribution box refers to a modular power distribution device installed in the stairwells of each floor. It integrates an incoming main control unit and an outgoing distribution unit, used to receive power transmitted from the main cable and distribute it to the corresponding user meter boxes on each floor. The number of cable distribution boxes deployed corresponds to the number of floors.

[0029] Understandably, this step establishes a decentralized power distribution node for subsequent temporary power supply to each floor by deploying cable distribution boxes in the stairwells of each floor of the high-rise building. This expands power distribution from a single point output from the generator to multiple points accessed on each floor, providing a physical basis for shortening the laying distance of branch cables.

[0030] Step S20: Lead the main cable out from the generator car and lay it longitudinally along the corridor, and connect the main cable to the inlet terminal of the cable distribution box on each floor. It should be noted that the main cable refers to the power cable connecting the output end of the generator truck to the inlet end of the cable distribution box on each floor. Its cross-sectional specifications are compatible with high-current copper terminals, used to enable long-distance longitudinal transmission of power from the generator truck along the corridor. The inlet end refers to the interface part in the main control unit inside the cable distribution box used to connect the main cable. This interface part is equipped with high-current copper terminals, and the phase sequence is marked next to the terminals.

[0031] Understandably, this step involves laying the main cable longitudinally along the corridor and connecting it to the cable distribution boxes on each floor, so that the power from the generator truck is transmitted vertically to each distribution node, thus constructing a primary power transmission channel from the generator truck to the distribution boxes on each floor, achieving an organic combination of centralized power transmission and tiered supply.

[0032] Step S30: Inside each of the cable distribution boxes, the power introduced by the main cable is distributed to each branch outgoing circuit via the main busbar and the main circuit breaker through the incoming line control unit. It should be noted that the incoming main control unit refers to the collection of electrical components on the incoming side located inside the cable distribution box. This includes a three-phase main incoming circuit, a main circuit breaker, and high-current copper terminals and a main busbar connected sequentially along the incoming direction. It is used to introduce, protect, and combine power from the main cable. The main busbar is the conductive busbar located at the output end of the incoming main control unit, used to combine and conduct power from the main circuit breaker output to each branch outgoing circuit. The main circuit breaker is a three-phase circuit breaker located in the main incoming circuit, with overload and short-circuit protection functions. It is used to quickly disconnect the main power supply in case of overload or short-circuit faults on the main cable side or in the downstream circuit, preventing the fault from spreading. Branch outgoing circuits refer to several outgoing channels connected in parallel from the main busbar. Each channel is independently equipped with an outgoing circuit breaker, used to distribute the power collected by the main busbar to each branch cable.

[0033] Understandably, this step involves distributing the power from the main cable introduced into each cable distribution box to each branch outgoing circuit via the main busbar and main circuit breaker through the main control unit inside each cable distribution box. This achieves secondary power distribution for each floor, allowing each outgoing circuit to be controlled independently, and providing an electrical isolation and protection basis for the subsequent branch power supply to each user's meter box.

[0034] Step S40: Branch cables are drawn from each branch outgoing circuit of each of the cable distribution boxes, and the branch cables are connected to the corresponding user meter boxes on each floor to form a temporary power supply circuit. It should be noted that branch cables refer to the power cables connecting the outgoing circuits of the cable distribution box to the corresponding user meter boxes on each floor. Their cross-sectional area is compatible with dedicated crimp terminals, used to transmit the power distributed via the branch outgoing circuits over short distances to each user meter box. User meter boxes are power distribution terminal equipment located on each floor for metering and distributing user electricity. Their incoming side is connected to the branch cables, and their outgoing side is connected to the indoor power distribution lines of each user.

[0035] Understandably, this step involves drawing branch cables from each branch circuit of each cable distribution box and connecting them to the corresponding user meter boxes on each floor, thus constructing a two-level power distribution channel from each floor distribution box to each user meter box, enabling temporary power to be ultimately delivered to the user side and forming a complete temporary power supply circuit.

[0036] Step S50: When it is confirmed that the temporary power supply circuit is working normally, disconnect the original busbar in the cable well from each user's meter box and replace the original busbar.

[0037] It should be noted that a temporary power supply circuit refers to a complete power transmission path consisting of a generator truck, main cables, electrical components inside cable distribution boxes, branch cables, and the incoming line side of user meter boxes. Confirming the normal operation of the temporary power supply circuit means checking that the main circuit breaker and all outgoing circuit breakers in each cable distribution box are in the closed position, and that the energizing indicators on the incoming line side of each user meter box are normal, thus verifying that the temporary power supply circuit has the capacity to continuously carry loads. The original busbar refers to the power supply busbar device located inside the cable shaft of a high-rise residential building, originally used to connect the upstream power supply to the user meter boxes on each floor. This busbar needs to be replaced due to insulation aging or overheating of the joints.

[0038] Understandably, after confirming that the temporary power supply circuit is working normally, this step disconnects the original busbar in the cable well from each user's meter box. At this time, each user's meter box is continuously powered by the temporary power supply circuit. After the original busbar is taken out of operation, it is no longer carrying user loads. Construction personnel can then carry out the replacement of the original busbar, thus achieving uninterrupted power supply to the user side throughout the entire busbar replacement process.

[0039] This embodiment provides a method for replacing busbars in high-rise cable shafts without power interruption. The method involves first constructing a temporary power supply circuit, confirming its normal operation, and then disconnecting the original busbar from each user's meter box before replacing it. This ensures continuous power supply to each user's meter box throughout the replacement process, allowing the replacement to be completed without power interruption. Because of the continuous power supply guarantee provided by the temporary power supply circuit, construction personnel do not need to obtain power outage plan approvals, wait for residents' rest periods, or implement power outage safety measures and restoration procedures. This allows for independent control of the construction time window by the workers, ensuring continuous and uninterrupted construction, ultimately completing the replacement of the original busbar while guaranteeing uninterrupted power supply to users throughout the entire process. This solves the technical problem of low construction efficiency in conventional high-rise residential shaft busbar replacement construction.

[0040] In one feasible implementation, the cable distribution box on each floor is fixed to the wall of the corresponding stairwell via wall-mounting holes on its back, and one cable distribution box is independently deployed on each floor.

[0041] It should be noted that wall-mounted mounting holes refer to the pre-installed mounting structures on the back of the cable distribution box for fixing the box to a vertical wall. These holes include, but are not limited to, oblong or round holes. These holes, in conjunction with expansion bolts, enable the box to be suspended, facilitating quick assembly and disassembly of the box on stairwell walls. Stairwell walls refer to the vertical load-bearing walls adjacent to or closest to the cable shaft within the stairwells of each floor of a high-rise building. This location is more concealed than corridors and does not obstruct normal passage for residents. Furthermore, the shorter horizontal distance between this location and the cable shaft helps to shorten the laying length of branch cables.

[0042] Understandably, this implementation method uses wall-mounted mounting holes to fix the cable distribution box to the walls of the stairwells on each floor, standardizing and facilitating the installation process without occupying stairwell space. Each floor has an independently deployed cable distribution box, ensuring independent temporary power supply to each floor. A failure in any distribution box on any floor only affects users on that floor and will not interfere with the normal power supply to other floors, facilitating localized fault control and refined operation and maintenance management. Furthermore, each distribution box is located in a fixed position within the stairwell of its respective floor, allowing construction personnel to perform wiring and power restoration operations conveniently on the corresponding floor without needing to cross floors to find work points, thus improving the orderliness and efficiency of construction organization.

[0043] In one feasible implementation, the cross-sectional area of ​​the trunk cable is 185mm². 2 Up to 240mm 2 The main cable is connected to the incoming line control unit through a high-current copper terminal block.

[0044] It should be noted that the main trunk cable refers to the power cable connecting the output end of the generator truck to the inlet end of the cable distribution box on each floor. Its cross-sectional area ranges from 185 square millimeters to 240 square millimeters. This cross-sectional area range is determined based on the total temporary power supply load demand of the entire building during the replacement of the vertical shaft busbar in a high-rise residential building. This includes, but is not limited to, selection based on a comprehensive calculation of the number of floors, the number of users on each floor, and the average electricity consumption per household, to meet the current carrying capacity requirements and control the line voltage drop within the allowable range. High-current copper terminals are conductive connectors located on the inlet side of the main control unit, used to achieve electrical connection between the main trunk cable and the electrical components inside the box. These terminals are made of copper, and their rated current carrying capacity matches that of the cable. The terminal structure and the cable core are connected to form a stable and durable electrical contact interface through crimping or bolt fastening.

[0045] It is understandable that this implementation method, by setting the cross-sectional area of ​​the main cable to 185 to 240 square millimeters, ensures sufficient current-carrying capacity for temporary power supply throughout the building, guaranteeing the power supply capacity requirements of users on all floors simultaneously. Simultaneously, high-current copper terminals are used to connect the main cable to the incoming control unit. The high conductivity of copper and the large contact area of ​​the terminals reduce contact resistance at the connection point, minimizing heat generation during long-term operation. This ensures the current-carrying reliability and long-term operational stability of the main power transmission link, providing a stable power input foundation for subsequent power distribution to each floor. Furthermore, the selection of the aforementioned cross-sectional area and terminal selection fully considers the load characteristics of vertical shaft replacement construction in high-rise residential buildings, demonstrating the adaptability of this application to specific application scenarios.

[0046] In one feasible implementation, the cross-sectional area of ​​the branch cable is 10mm. 2 Up to 35mm 2 The branch cable is connected to the branch outgoing circuit via a dedicated crimp terminal.

[0047] It should be noted that branch cables refer to the power cables connecting the branch outgoing circuits of the cable distribution box to the corresponding user meter boxes on each floor. Their cross-sectional area ranges from 10 square millimeters to 35 square millimeters. This range is determined comprehensively based on the number of user meter boxes on a single floor, the daily power load of each user, and the short-distance laying characteristics of the branch cables. This includes, but is not limited to, selection based on the number of households on each floor and the average power capacity per household, to meet the current carrying capacity requirements of the branch circuit while also considering the cable's bending radius and ease of wiring. Dedicated crimp terminals are conductive connectors located on the outgoing side of the branch outgoing circuit, used to achieve electrical connection between the branch cable and the outgoing circuit breaker or busbar. The structure of these terminals is compatible with the core specifications of cables with cross-sectional areas of 10 to 35 square millimeters. The terminals have internal crimping grooves or fastening structures, and the cable core is fixed to the terminal body and forms electrical contact through crimping or bolt locking.

[0048] Understandably, this implementation method sets the branch cable cross-section specifications from 10 square millimeters to 35 square millimeters, enabling the branch cable to have a current-carrying capacity matching the user's load requirements in a single-floor power supply scenario. This avoids both material waste and wiring difficulties caused by excessively large cross-sections, and the risk of overload and overheating caused by excessively small cross-sections. Simultaneously, the branch cable is electrically connected to the branch outgoing circuit using dedicated crimp terminals. The precise matching of the terminals and cable cross-section specifications ensures tight contact and conductivity stability at the connection point, reducing safety hazards such as overheating and arcing caused by loose wiring or poor contact. Furthermore, the selection of the branch cable cross-section and the design of the dedicated crimp terminals fully consider the dispersed layout of user meter boxes on each floor and the operational needs for rapid wiring on the construction site, making the branch cable laying and connection process more convenient and efficient, and helping to reduce the construction time for single-floor branch sections. Furthermore, the branch cable cross-section and the aforementioned trunk cable cross-section form a hierarchical and adaptable power supply cable configuration system. That is, the trunk cable with a large cross-section meets the centralized high-capacity transmission needs of the entire building, while the branch cable with a moderate cross-section meets the decentralized low-capacity access needs of a single floor. This hierarchical cable configuration optimizes the overall cable material cost while ensuring the current-carrying safety of each link, and further improves the construction economy from the perspective of cable selection and wiring structure.

[0049] In one feasible implementation, the load of each branch outgoing circuit is evenly distributed by adjusting the corresponding outgoing circuit breaker; when any of the branch outgoing circuits fails, the outgoing circuit breaker of the faulty outgoing circuit is independently disconnected for isolation, while the remaining branch outgoing circuits maintain normal power supply.

[0050] It should be noted that outgoing circuit breakers refer to switching devices installed in each branch outgoing circuit, used to control the on / off state of the circuit and perform overload and short-circuit protection, including but not limited to molded case circuit breakers or miniature circuit breakers. Load balancing refers to adjusting the setting current value of the corresponding outgoing circuit breaker or adjusting the number of user meter boxes connected to each circuit and the indoor load distribution, based on the load conditions of the user meter boxes connected to each branch outgoing circuit, to ensure that the load current carried by each branch outgoing circuit is relatively evenly distributed among each phase line and each circuit, avoiding an unbalanced state where some circuits are overloaded while others are lightly loaded or unloaded. Independent disconnection refers to operating only the corresponding outgoing circuit breaker of a specific faulty branch outgoing circuit to open it. This operation does not affect the energized state of the main busbar and other non-faulty branch outgoing circuits; the outgoing circuit breakers of other circuits remain closed and continue to supply power to the corresponding users.

[0051] Understandably, this implementation method achieves balanced load distribution across branch outgoing circuits by adjusting the corresponding outgoing circuit breakers, ensuring a reasonable allocation of the generator's total output capacity across all floors and circuits. This avoids localized line overload tripping or wasted generator capacity due to uneven load distribution, improving generator capacity utilization and the economic efficiency of the power supply system. When any branch outgoing circuit fails, the circuit breaker of that faulty circuit can be independently disconnected to isolate it from the system. Other non-faulty branch outgoing circuits remain unaffected and continue to receive power. This fault isolation mechanism reduces the power outage scope from the entire floor or building to a single faulty circuit, maximizing the continuity of power supply for non-faulty users and further enhancing the reliability of the temporary power supply system. Furthermore, all branch outgoing circuits are centrally configured and managed within cable distribution boxes. Construction personnel can perform load distribution adjustments and fault isolation operations for each circuit directly at the distribution box, eliminating the need for individual load adjustments or fault checks at each floor's user meter boxes. This makes load management and fault handling more centralized and efficient.

[0052] In one feasible implementation, during the busbar replacement construction, wiring and power outage operations are all concentrated at the cable distribution box in the stairwell of each floor; the door of the cable distribution box is equipped with a lock, and the door remains locked during non-operational periods.

[0053] It should be noted that wiring and power outage / restoration operations refer to electrical operations related to temporary power supply performed by construction personnel at the cable distribution box during busbar replacement construction. These operations include branch cable connection, outgoing circuit breaker closing and opening, main circuit breaker on / off control, and load adjustment. Power outage / restoration operations include, but are not limited to, isolating or restoring power to a single branch outgoing circuit at the distribution box, and connecting or disconnecting the main power supply to the entire floor's distribution boxes. Centralized execution means that all operations related to temporary power supply circuits are completed at the same location and on the same device. Construction personnel do not need to travel to different floor meter boxes for decentralized operations, nor do they need to repeatedly move between multiple locations within the building to execute power outage / restoration commands. All operational objects are located on the panel or internal electrical components of the cable distribution box. Locks refer to locking devices installed on the cable distribution box door, including but not limited to general lock cylinder structures, key-operated door locks, or padlock-compatible lock lug structures, used to control the opening and closing of the box door. Non-working hours refer to the time period after construction personnel have finished their daily work or temporarily left the construction site and no longer need to operate the electrical components inside the cable distribution box. During this time period, the box door should not be opened. Locking means that the box door is in a state where it cannot be opened arbitrarily under the action of a lock. Unauthorized personnel cannot open the box door and access the live components inside without the corresponding key or tools.

[0054] Understandably, this implementation method centralizes all wiring and power outage / restoration operations at the cable distribution boxes in the stairwells of each floor. This eliminates the need for construction personnel to travel between meter boxes and generator carts on different floors. All power outage / restoration commands are completed uniformly at the distribution boxes, reducing the frequency of personnel movement on the construction site and the management burden caused by dispersed operations. This improves construction organization efficiency and the orderliness of on-site operations. Simultaneously, the cable distribution box doors are equipped with locks and remain locked during non-working hours, effectively isolating the live busbars, terminals, and circuit breaker operating components inside the box from the external environment during unsupervised periods. Unauthorized personnel cannot access the live parts inside the box, reducing the risk of electric shock and short circuits caused by unauthorized personnel entering or accidentally touching the equipment. This enhances the safety management level of the temporary power supply system during the construction period.

[0055] In one feasible implementation, during the busbar replacement construction, the load adjustment and fault diagnosis of each branch circuit are carried out by the outgoing circuit breaker of each cable distribution box, so as to avoid operating each floor's user meter box one by one.

[0056] It should be noted that fault diagnosis refers to the process by which construction personnel determine the cause of a fault and take appropriate measures when an abnormal power outage, voltage instability, or circuit breaker tripping occurs in a branch outgoing circuit during temporary power supply. This process includes, but is not limited to, determining whether a circuit has tripped by observing the open / closed status of the outgoing circuit breaker, and initially determining whether the fault is located on the cable side or the meter box side of the circuit by means of test power supply and voltage detection at the distribution box. Operating each floor's user meter box individually refers to the requirement, in conventional solutions without cable distribution boxes, for construction personnel to go to the location of each meter box and complete load adjustments, switch operations, and fault checks at the meter box.

[0057] Understandably, this implementation method shifts the operation points for load adjustment and fault diagnosis from the user meter boxes on each floor to the cable distribution boxes during the busbar replacement construction. This allows construction personnel to complete the above operations without having to move back and forth between multiple meter box locations, reducing the time spent by personnel moving around during the operation process and the time spent switching work points, thus improving the work efficiency during the operation and maintenance phase. At the same time, the centralized operation points also facilitate construction supervision and the unified implementation of operation specifications.

[0058] This application also provides a cable distribution box for uninterrupted power-off replacement of busbars in high-rise cable wells, the cable distribution box comprising: The enclosure is made of cold-rolled steel plate in one piece, with an electrostatic powder coating anti-corrosion layer on the surface. It has wall-mounting holes on the back, a carrying handle on the top, and knock-out cable entry / exit holes on the top and bottom sides. The door is equipped with a lock. The incoming line control unit is located inside the enclosure and includes a three-phase main incoming line circuit, a main circuit breaker, and high-current copper terminals and a main busbar that are connected sequentially along the incoming line direction. The main circuit breaker has overload protection and short-circuit protection functions. The high-current copper terminals are used to connect to the main cable led out from the generator car. The area of ​​the incoming line control unit is equipped with phase sequence markings. The outgoing line distribution unit, arranged in parallel along the main busbar within the enclosure, includes multiple branch outgoing line circuits. Each branch outgoing line circuit is independently equipped with an outgoing line circuit breaker and a dedicated terminal block. The dedicated terminal block is used to connect the branch cable supplying power to the user's meter box. The outgoing line distribution unit also includes a neutral busbar and a protective ground busbar, which are independent of the main busbar. The neutral, ground, and phase wires are arranged in layers. Each branch outgoing line circuit has reserved identification positions for marking the corresponding meter box number and phase sequence. The safety protection unit includes an insulating protective cover covering the live busbars and terminals inside the enclosure, a dedicated grounding bolt on the enclosure, and a system wiring diagram and safety operation instructions posted on the inside of the enclosure door.

[0059] It should be noted that cold-rolled steel sheet refers to steel sheet material processed by cold rolling, used to ensure that the enclosure has sufficient mechanical strength and resistance to deformation. One-piece molding means that the back panel, side panels, and top and bottom panels of the enclosure are formed into an integral structure through bending and welding processes, eliminating the need for on-site assembly. Electrostatic powder coating is a coating formed by uniformly adhering plastic powder to the surface of the enclosure through electrostatic spraying and then curing at high temperature. This coating has anti-corrosion, anti-rust, and insulating protection functions. Wall-mounted mounting holes are pre-installed mounting structures on the back of the enclosure for fixing it to a vertical wall; their positions correspond to the expansion bolt installation positions on the walls of stairwells on each floor. A carrying handle is a handle structure located on the top of the enclosure for workers to carry it by hand. Knock-out cable entry / exit holes are pre-reserved holes on the top and bottom sides of the enclosure. These holes have pre-compression break lines at the edges. During construction, depending on the actual cable entry / exit direction and the number of cables, the sealing plate inside the hole is removed by knocking, creating an opening for the cable to pass through. Locks refer to locking devices installed on the doors of boxes.

[0060] It should be noted that the three-phase main incoming circuit refers to the power input channel composed of three phase lines (A, B, and C) used to connect to the three-phase AC power provided by the generator. The main circuit breaker is a switching device installed in the main incoming circuit, with overload and short-circuit protection functions. It automatically disconnects the main power supply when an overload or short-circuit fault occurs on the main cable side or in the main circuit within the box. High-current copper terminals are high-rated current connectors made of copper and installed on the incoming side of the main control unit. The main busbar is a copper conductive busbar located at the output end of the main control unit, used to combine and conduct power from the main circuit breaker output to each branch outgoing circuit. Phase sequence markings refer to the markings of phases A, B, and C, as well as the neutral (N) and ground (PE) wires in the main control unit area.

[0061] It should be noted that a branch outgoing circuit refers to several outgoing channels connected in parallel from the main busbar, each used to supply power to one or a group of user meter boxes. An outgoing circuit breaker is a switching device installed in each branch outgoing circuit, used to independently control the on / off state of the circuit and perform overload and short-circuit protection. A dedicated terminal block is a conductive connector installed on the outgoing side of a branch outgoing circuit, its structure adapted to the core specifications of cables with cross-sections from 10 square millimeters to 35 square millimeters. A neutral busbar is a conductive busbar installed in the outgoing distribution unit to collect the neutral (N) wires of each branch circuit. A protective earth busbar is a conductive busbar installed in the outgoing distribution unit to collect the protective earth (PE) wires of each branch circuit. Layered arrangement refers to the spatially layered arrangement of the neutral busbar, protective earth busbar, main busbar, and phase terminals. An identification position refers to a marked area reserved at the corresponding location of each branch outgoing circuit.

[0062] It should be noted that an insulating protective cover refers to an insulating partition or sheath covering the live busbars and terminals inside the enclosure. This cover is made of flame-retardant insulating material and only exposes the standard wiring operation area. A dedicated grounding bolt is a grounding connector installed on the enclosure, used to electrically connect the enclosure to the field grounding device via a grounding wire. A system wiring diagram is an electrical schematic diagram drawn on the inside of the enclosure door, used to show the electrical connections between the incoming main control unit, outgoing distribution units, and various electrical components. Safety operation instructions are textual warning messages printed on the inside of the enclosure door.

[0063] It is understood that this implementation method, through the structural combination of the aforementioned enclosure, incoming main control unit, outgoing distribution unit, and safety protection unit, provides the cable distribution box with a complete hardware foundation compatible with the uninterrupted power replacement construction method for high-rise cable well busbars. The enclosure structure facilitates wall-mounted installation in stairwells on each floor and on-site handling. The incoming main control unit realizes the introduction, protection, and convergence of main power, the outgoing distribution unit realizes independent distribution and control of multiple circuits, and the safety protection unit ensures the operational safety of personnel and equipment. The cooperation between these units enables the cable distribution box to independently complete the functions of load distribution, fault isolation, and operational status monitoring of each circuit during temporary power supply, providing hardware support for the implementation of the construction method.

[0064] In one feasible embodiment, the box door is provided with a transparent observation window, the position of which corresponds to the open / closed status indication area of ​​the circuit breakers inside the box, so as to view the open / closed status of each circuit breaker without opening the box door.

[0065] It should be noted that a transparent observation window refers to a transparent panel-like structure embedded in the cabinet door. Its material includes, but is not limited to, tempered glass or transparent polycarbonate, possessing sufficient mechanical strength and electrical insulation properties. It is used to observe the visible status information of the electrical components inside the cabinet when the cabinet door is closed. The open / close status indication area refers to the status display area located on the circuit breaker panel. This area uses color changes or mechanical indicators to show the current open or closed status of the circuit breaker, including but not limited to red indicating closed, green indicating open, or using "ON" or "OFF" text markings. The location corresponding to the open / close status indication area of ​​the circuit breakers inside the cabinet means that the transparent observation window's position on the cabinet door is spatially aligned with the open / close status indication area of ​​each circuit breaker inside the cabinet, allowing operators to directly see the open / close status indication marks of each circuit breaker through the observation window.

[0066] It is understood that this implementation method, by setting a transparent observation window on the box door and positioning the observation window in accordance with the open / closed status indication area of ​​the circuit breakers inside the box, allows construction personnel to visually view the open / closed status of each circuit breaker without opening the box door. This eliminates the need to open the box door and contact the live areas inside the box during inspections or status confirmations, reducing the frequency of box door openings and the opportunity for workers to directly contact live equipment, thereby improving the safety and convenience of daily inspections.

[0067] In one feasible embodiment, the number of branch outgoing circuits in the outgoing distribution unit is configured according to the number of meter boxes on the corresponding floor; the main circuit breaker is a three-phase circuit breaker, and each outgoing circuit breaker is a single-phase circuit breaker or a three-phase circuit breaker.

[0068] It should be noted that the configuration of the number of branch outgoing circuits based on the number of meter boxes on the corresponding floor means that the number of branch outgoing circuits installed inside the cable distribution box at the factory or during on-site assembly is consistent with the actual number of user meter boxes installed on that floor. This includes, but is not limited to, an independent power distribution mode where each outgoing circuit corresponds to one user meter box, and a combined power distribution mode where one outgoing circuit simultaneously carries multiple meter boxes on the same floor. The specific configuration method is determined based on the user density of the floor and the on-site wiring conditions. A three-phase circuit breaker is a switching device that simultaneously controls the on / off state of three phase lines: A, B, and C. A single-phase circuit breaker is a switching device that only controls the on / off state of a single phase line.

[0069] Understandably, this implementation method matches the cable distribution box's circuit configuration to actual user access needs by configuring the number of branch outgoing circuits in the outgoing distribution unit according to the number of meter boxes on the corresponding floor. This avoids both insufficient circuit quantity leading to incomplete power supply coverage and excessive circuit quantity causing increased equipment costs and wasted box space, thus improving the cable distribution box's adaptability to different floor conditions. The main circuit breaker is a three-phase circuit breaker, capable of simultaneously disconnecting all three-phase main incoming circuits. In the event of a main side fault or emergency, it achieves complete power isolation of the entire distribution box, ensuring the main side's safety protection capability. Each outgoing circuit breaker uses either a single-phase or three-phase circuit breaker depending on the branch circuit load type, ensuring that each branch circuit receives on / off control and fault protection adapted to its load characteristics. This hierarchical configuration structure of the main circuit breaker and outgoing circuit breakers enables the cable distribution box to achieve overload and short-circuit protection functions matched to their respective current levels and load characteristics on both the main incoming side and the branch outgoing side.

[0070] The cable distribution box provided in this application for uninterrupted power supply replacement of busbars in high-rise cable wells, employing the uninterrupted power supply replacement method for high-rise cable wells described in the above embodiments, can solve the technical problem of low efficiency in the replacement of busbars in vertical shafts of high-rise residential buildings. Compared with the prior art, the beneficial effects of the uninterrupted power supply replacement device for high-rise cable wells provided in this application are the same as those of the uninterrupted power supply replacement method for high-rise cable wells provided in the above embodiments, and other technical features in the uninterrupted power supply replacement device for high-rise cable wells are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0071] For example, to help understand the implementation process of the high-rise cable well busbar uninterrupted replacement construction method obtained by combining this embodiment with the above embodiments, please refer to... Figure 2 , specifically: This embodiment employs a three-tiered power distribution architecture: generator truck – main cable – cable distribution box – branch cable – meter boxes on each floor. This architecture enables centralized power transmission and distributed access, simplifies wiring logic, and improves construction and management efficiency. The first-tier power supply uses the generator truck as a temporary power source. The generator truck's capacity is determined based on the site load requirements, and 1-2 main cables are drawn from its output to transmit power to the cable distribution boxes on each floor, ensuring overall power supply capacity. The second-tier distribution uses the cable distribution boxes as intermediate distribution nodes, installed in the stairwells of each floor. These boxes receive power from the main cable and distribute it appropriately to the meter boxes on that floor using internal terminals, switches, and other equipment. The third-tier access involves drawing short-distance branch cables from the cable distribution boxes and directly connecting them to the meter boxes on that floor, achieving the final power transmission and meeting users' temporary power needs. Figure 2 This is a schematic diagram of the cable distribution box wiring method provided in the embodiment of the construction method for replacing the busbar of the high-rise cable well without power interruption in this application.

[0072] For example, please refer to Figure 3 , Figure 3 A schematic diagram of the cable distribution box structure provided in the embodiment of the high-rise cable well busbar uninterrupted replacement construction method of this application is shown in detail below: The cable distribution box used in this solution is a modular power distribution device customized for temporary power supply scenarios in high-rise residential buildings. It is suitable for temporary installation in stairwells around shafts and can efficiently complete the main power reception and multi-circuit branch distribution. The overall structure mainly consists of four parts, such as... Figure 3 As shown.

[0073] First, the enclosure itself. It is made of thick cold-rolled steel plate in one piece, with an electrostatic powder coating for corrosion protection, meeting the dustproof and accidental contact prevention requirements for temporary use in indoor corridors. The enclosure dimensions balance current carrying capacity and on-site portability, with standard wall-mounting holes pre-drilled on the back and a carrying handle on the top. The top and bottom sides of the enclosure have knock-out cable entry / exit holes to accommodate cables of different diameters; the door is equipped with a universal lock, allowing for closed management during non-operating periods to prevent accidental contact by unauthorized personnel.

[0074] Secondly, the main control unit for incoming lines. The incoming side of the enclosure is equipped with a three-phase main incoming line circuit, and a circuit breaker is installed as the main switch, providing overload and short-circuit protection. It can quickly cut off the power supply in case of a fault in the downstream circuit, preventing the fault from spreading. The incoming end is equipped with high-current copper terminal blocks, compatible with 185mm² wires. 2 -240mm 2 The main cable is connected with phase sequence markings next to the terminals to avoid the risk of incorrect phase sequence wiring from the source. An independent main busbar is installed on the incoming side inside the box to ensure current carrying capacity under heavy loads and contact reliability during long-term operation.

[0075] Thirdly, the outgoing line distribution unit. Multiple branch outgoing line circuits are connected in parallel along the main busbar inside the box. The number of circuits can be flexibly configured according to the number of meter boxes on each floor. Each outgoing line is independently equipped with an outgoing circuit breaker, enabling independent power outage and restoration operations for a single meter box and a single circuit. Fault handling does not affect the normal power supply to other circuits. Each outgoing line is equipped with a dedicated crimp terminal, compatible with 10mm² wires. 2 -35mm 2 Branch cables are connected, and independent neutral and protective ground busbars are installed. The neutral, ground, and phase wires are arranged in a standardized, layered manner, with clear wiring logic. Each outgoing circuit has a dedicated identification slot to mark the corresponding meter box number and phase sequence, facilitating on-site maintenance and rapid fault diagnosis.

[0076] Fourthly, the safety protection unit. All live busbars and terminals inside the box are equipped with insulating protective covers, exposing only the standard wiring operation area, effectively preventing workers from accidentally touching live parts. The box is equipped with a dedicated grounding bolt, which can be directly and reliably connected to the field grounding device to prevent the risk of leakage from the box. The system wiring diagram and safety operation tips are posted on the inside of the box door to standardize the on-site operation process; a transparent observation window is optional, allowing you to check the circuit breaker's open / closed status without opening the box, improving the safety and convenience of daily inspections.

[0077] In one specific implementation method, the overall process of the high-rise cable well busbar replacement construction method without power interruption includes the following steps: First, in the power supply stage, the capacity of the generator truck is determined according to the on-site load demand. The main cable is led out from the output end of the generator truck and laid along the corridor to the cable distribution box in the stairwell of each floor to realize centralized power transmission. Secondly, in the power distribution process, switches and terminals are installed in the cable distribution box to distribute the main cable into several branch circuits according to the number of meter boxes and load conditions on each floor, ensuring that the load of each branch circuit is balanced. Thirdly, in the terminal access stage, a short-distance branch cable is led out from the branch circuit of the cable distribution box and directly connected to the plug-in box (meter box) on each floor to complete the terminal wiring of temporary power supply and ensure that users can use electricity normally. Fourthly, in terms of safety control, all wiring operations are strictly carried out in accordance with regulations. The cable distribution box is fixed in a safe location in the stairwell, and the cables are laid and fixed in a standardized manner along the corridor to avoid messy placement. During the operation, the operation is concentrated at the cable distribution box to facilitate monitoring and safety management. Fifth, in the post-operation support phase, during temporary power supply, each branch circuit can be managed uniformly through the cable distribution box. If it is necessary to adjust the load or troubleshoot, the operation can be carried out directly at the distribution box without having to check each meter box individually, which greatly improves the efficiency of operation and maintenance.

[0078] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the construction method for replacing the high-rise cable well busbar without power interruption. Any simple modifications based on this technical concept are within the protection scope of this application.

[0079] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. All equivalent structural transformations made under the technical concept of this application and using the content of this application specification and drawings, or direct / indirect applications in other related technical fields, are included in the scope of protection of this application.

Claims

1. A method for replacing the busbar of a high-rise cable well without power interruption, characterized in that, The method includes: Provide generator trucks as temporary power sources and deploy cable distribution boxes in the stairwells of each floor of the high-rise building; The main cable is led out from the generator car and laid longitudinally along the corridor, and the main cable is connected to the inlet terminal of the cable distribution box on each floor. Inside each of the cable distribution boxes, the power introduced by the main cable is distributed to each branch outgoing circuit via the main busbar and the main circuit breaker through the incoming line control unit. Branch cables are drawn from each branch outgoing circuit of each of the aforementioned cable distribution boxes, and the branch cables are respectively connected to the user meter boxes on the corresponding floors to form a temporary power supply circuit. Once it is confirmed that the temporary power supply circuit is operating normally, disconnect the original busbar in the cable well from each user's meter box and replace the original busbar.

2. The method according to claim 1, characterized in that, The cable distribution boxes on each floor are fixed to the wall of the corresponding stairwell via wall-mounting holes on their backs, and one cable distribution box is independently deployed on each floor.

3. The method according to claim 1, characterized in that, The cross-sectional specification of the main cable is 185mm². 2 Up to 240mm 2 The main cable is connected to the incoming line control unit through a high-current copper terminal block.

4. The method according to claim 1, characterized in that, The cross-sectional area of ​​the branch cable is 10mm. 2 Up to 35mm 2 The branch cable is connected to the branch outgoing circuit via a dedicated crimp terminal.

5. The method according to claim 1, characterized in that, The load of each branch outgoing circuit is evenly distributed by adjusting the corresponding outgoing circuit breaker; when any of the branch outgoing circuits fails, the outgoing circuit breaker of the faulty outgoing circuit is independently disconnected for isolation, and the other branch outgoing circuits maintain normal power supply.

6. The method according to claim 1, characterized in that, During the busbar replacement construction, wiring and power outage / restoration operations are all carried out at the cable distribution boxes in the stairwells of each floor; the doors of the cable distribution boxes are equipped with locks, and the doors remain locked during non-operational periods.

7. The method according to any one of claims 1 to 6, characterized in that, During the busbar replacement construction, the outgoing circuit breakers of each cable distribution box are used to adjust the load and troubleshoot each branch circuit to avoid operating each user meter box on each floor individually.

8. A cable distribution box for uninterrupted power-off replacement of busbars in high-rise cable wells, characterized in that, include: The enclosure is made of cold-rolled steel plate in one piece, with an electrostatic powder coating anti-corrosion layer on the surface. It has wall-mounting holes on the back, a carrying handle on the top, and knock-out cable entry / exit holes on the top and bottom sides. The door is equipped with a lock. The incoming line control unit is located inside the enclosure and includes a three-phase main incoming line circuit, a main circuit breaker, and high-current copper terminals and a main busbar that are connected sequentially along the incoming line direction. The main circuit breaker has overload protection and short-circuit protection functions. The high-current copper terminals are used to connect to the main cable led out from the generator car. The area of ​​the incoming line control unit is equipped with phase sequence markings. The outgoing line distribution unit, arranged in parallel along the main busbar within the enclosure, includes multiple branch outgoing line circuits. Each branch outgoing line circuit is independently equipped with an outgoing line circuit breaker and a dedicated terminal block. The dedicated terminal block is used to connect the branch cable supplying power to the user's meter box. The outgoing line distribution unit also includes a neutral busbar and a protective ground busbar, which are independent of the main busbar. The neutral, ground, and phase wires are arranged in layers. Each branch outgoing line circuit has reserved identification positions for marking the corresponding meter box number and phase sequence. The safety protection unit includes an insulating protective cover covering the live busbars and terminals inside the enclosure, a dedicated grounding bolt on the enclosure, and a system wiring diagram and safety operation instructions posted on the inside of the enclosure door.

9. The cable distribution box according to claim 8, characterized in that, The box door is equipped with a transparent observation window, the position of which corresponds to the open / closed status indication area of ​​the circuit breakers inside the box, so as to view the open / closed status of each circuit breaker without opening the box door.

10. The cable distribution box according to claim 8, characterized in that, The number of branch outgoing circuits in the outgoing distribution unit is configured according to the number of meter boxes on the corresponding floor; the main circuit breaker is a three-phase circuit breaker, and each outgoing circuit breaker is a single-phase circuit breaker or a three-phase circuit breaker.

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