Intelligent damp-proof power-saving power distribution cabinet group

Abstract

This invention discloses an intelligent moisture-proof and energy-saving power distribution cabinet group, relating to the field of moisture-proof dehumidification and energy-saving control technology for complete sets of power distribution equipment. The power distribution cabinet group includes multiple parallel power distribution cabinets, a cabinet-to-cabinet humidity and heat relay unit located between adjacent cabinets, a zone-shared dehumidification unit connected to the cabinet-to-cabinet humidity and heat relay unit, a cold point evidence collection unit, a cable inlet moisture collection unit, a cabinet door status collection device, a local circulating fan, and a control unit. The cabinet-to-cabinet humidity and heat relay unit includes a relay temperature equalization chamber, a drying bypass chamber, and a dual-valve isolation buffer chamber. The control unit determines the cabinet-to-cabinet temperature equalization, zoned dehumidification, or dual-valve isolation conditions based on the cold point and moisture return collection results, and controls the corresponding actuators to operate. This invention can achieve cabinet-to-cabinet temperature equalization, zoned shared dehumidification, and abnormal moisture return isolation for rows of power distribution cabinets, reducing the risk of local condensation and ineffective dehumidification energy consumption.

Description

Technical Field

[0001] This invention relates to the field of moisture-proof dehumidification and energy-saving control technology for complete sets of power distribution equipment, and more specifically, to an intelligent moisture-proof energy-saving power distribution cabinet assembly. Background Technology

[0002] Distribution cabinets are commonly used in power distribution rooms, factory power distribution rooms, underground garage power distribution rooms, and power distribution rooms in humid coastal areas. In these scenarios, rows of distribution cabinets operate in a relatively enclosed environment for extended periods. The cable entry points at the bottom of the cabinets, cable trenches, wall-mounted cabinet panels, and electrical connection points inside the cabinets are susceptible to moisture, low temperatures, and insufficient local ventilation, posing a risk of condensation and dampness.

[0003] In the prior art, CN118889205A discloses a heat dissipation and moisture-proof device and method for an electrical control cabinet. This solution addresses the heat dissipation and moisture-proof requirements of electrical control cabinets and aims to regulate the humidity inside the cabinet through the cabinet ventilation structure, pipe structure, switch components, and dehumidification components.

[0004] The aforementioned existing solutions typically include a cabinet, ventilation slots on the side wall of the cabinet, pipes connected to the ventilation slots, a switch assembly located between the ventilation slots and the pipes, and a dehumidification assembly located within the pipes. Through the switch assembly and the dehumidification assembly, the cabinet can circulate internal or external air. The dehumidification assembly is activated when the internal humidity exceeds a preset value and deactivated when the internal humidity decreases, thus maintaining the humidity within the cabinet within a preset range.

[0005] However, in applications such as underground power distribution rooms, rows of power distribution cabinets, and cable trenches where moisture can accumulate, the load heating status, wall position, door opening status, cable inlet sealing status, and cold spot status of different cabinets are not consistent. The ventilation and dehumidification solutions described above, which target individual cabinets, cannot simultaneously consider the utilization of warm airflow between adjacent cabinets, the allocation of centralized dehumidification resources, and the isolation verification between cabinets with abnormal moisture accumulation and adjacent cabinets. If each cabinet is dehumidified independently, it can easily increase the ineffective operating energy consumption of low-risk cabinets. If adjacent cabinets are connected for a long time, it may cause the moisture from abnormal cabinets to spread to other cabinets.

[0006] Therefore, it is still necessary to provide an intelligent moisture-proof energy-saving distribution cabinet group that can adapt to the actual layout of rows of distribution cabinets. Under the premise of meeting the electrical safety isolation requirements, it can coordinate the treatment of hot and humid airflow between cabinets, zoned shared dehumidification, cold point evidence collection, and abnormal back-moisture isolation to reduce the risk of local condensation and ineffective dehumidification energy consumption. Summary of the Invention

[0007] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide an intelligent moisture-proof energy-saving distribution cabinet group. By setting up an inter-cabinet humidity and heat relay unit, a dual-valve isolation buffer chamber, and a drying bypass chamber between adjacent distribution cabinets, and combining them with a zone-shared dehumidification unit, a cold point evidence collection unit, and a control unit, the present invention solves the problems mentioned in the background art, such as easy condensation at local cold points in rows of distribution cabinets, high energy consumption for independent dehumidification of single cabinets, and easy diffusion of moisture from abnormally damp cabinets to adjacent cabinets.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A smart moisture-proof energy-saving distribution cabinet assembly includes multiple distribution cabinets arranged in parallel, an inter-cabinet humidity and heat relay unit disposed between two adjacent distribution cabinets, a zone-shared dehumidification unit connected to the inter-cabinet humidity and heat relay unit, a cold point evidence acquisition unit, a cable inlet moisture acquisition unit, a cabinet door status acquisition device, a local circulating fan, and a control unit disposed within the distribution cabinets; the inter-cabinet humidity and heat relay unit includes a relay uniform temperature chamber, a drying bypass chamber, and a dual-valve isolation buffer chamber; the dual-valve isolation buffer chamber includes two isolation air valves, a buffer chamber located between the two isolation air valves, and a buffer chamber humidity detection device disposed within the buffer chamber. The control unit is used to determine the cabinet temperature uniformity condition, zoned dehumidification condition, or dual-valve isolation condition based on the acquisition results of the cold point evidence acquisition unit and the cable inlet moisture return acquisition unit. The control unit is also used to control the local circulating fan to allow airflow through the relay temperature uniformity chamber between two adjacent distribution cabinets, or to control the zoned shared dehumidification unit to supply dry air to the distribution cabinet requiring dry air through the drying bypass chamber, or to control the two isolation valves to close to cut off the cabinet-to-cabinet connection between the corresponding distribution cabinet and the adjacent distribution cabinet.

[0009] In a preferred embodiment, the control unit determines the cabinet temperature uniformity, zoned dehumidification, or dual-valve isolation conditions based on the data collected by the cold point evidence collection unit and the cable inlet moisture return collection unit. This includes: acquiring the cabinet interior air temperature, cabinet interior relative humidity, cabinet bottom cold point temperature, electrical high-risk cold point temperature, and cabinet panel cold point temperature collected by the cold point evidence collection unit, and acquiring the cable inlet moisture return status collected by the cable inlet moisture return collection unit; determining the cabinet interior air dew point temperature based on the cabinet interior air temperature and cabinet interior relative humidity; comparing the cabinet bottom cold point temperature, electrical high-risk cold point temperature, and cabinet panel cold point temperature with the cabinet interior air dew point temperature to obtain the corresponding cold point dew point safety margin; and determining whether the corresponding cold point is in a safe state, observation state, processing state, or emergency processing state based on the dew point safety margin.

[0010] In a preferred embodiment, the control unit determines the temperature uniformity conditions between cabinets by: identifying distribution cabinets where the cold point is in a safe state and the cable inlet dampness condition has not been established as candidate supply cabinets; identifying distribution cabinets where the cold point is in an observation or processing state as candidate rescue cabinets; determining that the temperature uniformity conditions between cabinets are established when the air temperature inside the candidate supply cabinet is higher than the air temperature inside the candidate rescue cabinet, and the doors of both the candidate supply cabinet and the candidate rescue cabinet are closed, the position feedback and control status of the two isolation air valves are consistent, the humidity of the buffer chamber does not meet the condition of continuous increase, and the fire linkage status is not established; and when the temperature uniformity conditions between cabinets are established, controlling the local circulating fan to guide the warm airflow in the candidate supply cabinet through the relay temperature uniformity chamber into the candidate rescue cabinet.

[0011] In a preferred embodiment, the control unit determines the zoned dehumidification conditions by: identifying the distribution cabinet as a candidate cabinet for zoned dehumidification when the cold spot of the distribution cabinet is in a processing or emergency processing state and the temperature uniformity between cabinets is not met; prioritizing the distribution cabinet with the electrical high-risk cold spot in an emergency processing state as the distribution cabinet requiring the supply of dry air when there are multiple candidate cabinets for zoned dehumidification; identifying the distribution cabinet with the cold spot at the bottom of the cabinet in an emergency processing state as the distribution cabinet requiring the supply of dry air when there are no distribution cabinets with the electrical high-risk cold spot in an emergency processing state; determining the distribution cabinet requiring the supply of dry air based on the duration of the risk, the number of historical backflows, and the availability of the air supply path between the zoned shared dehumidification unit and the drying bypass cavity when multiple distribution cabinets have the same priority; and controlling the zoned shared dehumidification unit to supply dry air to the distribution cabinet requiring the supply of dry air through the drying bypass cavity.

[0012] In a preferred embodiment, the control unit determines the dual-valve isolation conditions by: determining that the dual-valve isolation conditions are met when: the cabinet door remains open for more than the confirmation time; the cable inlet dampness condition is established; the cable inlet dampness acquisition unit outputs a bottom water accumulation signal; the humidity in the buffer chamber continues to rise; the micro-pressure in the buffer chamber is abnormal; either of the two isolation valves is not in position; any key acquisition result of the cold point evidence acquisition unit fails; the cable inlet dampness acquisition unit fails; the buffer chamber humidity detection device fails; the buffer chamber micro-pressure detection device fails; or the cabinet experiences over-temperature, smoke signal, circuit breaker fault trip signal, or fire alarm linkage status. When the dual-valve isolation conditions are met, the control unit closes the two isolation valves and prohibits the corresponding distribution cabinet from participating in relay temperature equalization and regular zone shared dehumidification air supply.

[0013] In a preferred embodiment, the inter-cabinet heat and humidity relay unit includes a relay housing, which is disposed between two adjacent distribution cabinets; the relay temperature equalization cavity, the drying bypass cavity, and the dual-valve isolation buffer cavity are arranged in parallel within the relay housing and form independent airflow paths respectively; the two ends of the relay temperature equalization cavity are respectively connected to the interior of the two adjacent distribution cabinets; the drying bypass cavity is connected to the zoned shared dehumidification unit and to the interior of the distribution cabinet that needs to be supplied with dry air.

[0014] In a preferred embodiment, the two isolation valves include a first isolation valve and a second isolation valve; the first isolation valve is located near one side of one of the two adjacent power distribution cabinets, and the second isolation valve is located near the other side of one of the two adjacent power distribution cabinets; the buffer chamber is located between the first isolation valve and the second isolation valve, and the buffer chamber humidity detection device and the buffer chamber micro-pressure detection device are used to provide feedback on the isolation effect to the control unit; the buffer chamber is provided with a pressure-limiting micro-exhaust device and a condensate drainage channel.

[0015] In a preferred embodiment, the zoned shared dehumidification unit includes a dehumidification module, a dry air distribution manifold, and multiple zoned air ducts; the dry air distribution manifold is connected to the dehumidification module, and the multiple zoned air ducts are respectively connected to the dry air distribution manifold; each zoned air duct is connected to a corresponding dry bypass cavity, and each zoned air duct is provided with an electrically controlled air duct valve and a bypass check valve; the control unit is used to control the opening and closing of the electrically controlled air duct valve to selectively supply dry air to the dry bypass cavity corresponding to the power distribution cabinet that needs to be supplied with dry air; the bypass check valve is used to restrict the reverse flow of humid air in the power distribution cabinet to the zoned air duct.

[0016] In a preferred embodiment, the system further includes an external exhaust auxiliary unit and an external air temperature and humidity acquisition device. The external exhaust auxiliary unit includes an external exhaust vent, an external exhaust check valve, a rain cover, an insect screen, and an external exhaust filter. The external air temperature and humidity acquisition device is used to collect the external air temperature and relative humidity. The control unit is used to determine the dew point of the air inside the cabinet based on the data collected by the cold point evidence acquisition unit, and to determine the external air dew point based on the data collected by the external air temperature and humidity acquisition device. When the external air dew point is lower than the dew point inside the cabinet, the cabinet door is closed, the cable inlet dampness condition is not established, the feedback and control status of the external exhaust check valve are consistent, and the rain cover, the insect screen, and the external exhaust filter are not blocked, the external exhaust auxiliary unit is controlled to discharge the humid air inside the corresponding power distribution cabinet.

[0017] In a preferred embodiment, an alarm and maintenance reminder unit is also included; the control unit is further configured to acquire feedback results from the cabinet door status acquisition device, the buffer chamber humidity detection device, the buffer chamber micro-pressure detection device, the zone-shared dehumidification unit, and the local circulating fan; based on the feedback results, the control unit switches the intelligent moisture-proof energy-saving distribution cabinet group between a low-power standby state, a cold point observation state, a relay temperature equalization state, a zone-shared dehumidification state, a dual-valve isolation state, or a maintenance reminder state; when the intelligent moisture-proof energy-saving distribution cabinet group enters the maintenance reminder state, the control unit controls the alarm and maintenance reminder unit to output a maintenance reminder, and controls the corresponding distribution cabinet to not participate in relay temperature equalization and regular zone-shared dehumidification air supply.

[0018] The technical effects and advantages of the intelligent moisture-proof energy-saving power distribution cabinet of the present invention are as follows: This invention sets up an inter-cabinet humidity and heat relay unit between adjacent power distribution cabinets, and forms a relay temperature equalization chamber, a drying bypass chamber and a dual-valve isolation buffer chamber within the inter-cabinet humidity and heat relay unit. This enables short-term temperature equalization between adjacent cabinets when safety conditions are met, and connects to a zone-shared dehumidification unit when dehumidification is required, thereby reducing energy waste caused by each cabinet independently configuring or starting a dehumidification device.

[0019] This invention collects data on the cold point locations of the cabinet bottom, cable inlets, high-risk electrical areas, and cabinet panels through a cold point evidence collection unit. This allows the control unit to determine dehumidification needs not only based on the humidity of the air inside the cabinet, but also to determine cold point observation, relay temperature equalization, or zoned shared dehumidification actions based on the actual condensation-prone locations. This helps to improve the targeting of anti-condensation treatment and reduce ineffective dehumidification operation in low-risk cabinets.

[0020] This invention forms a dual-valve isolation and buffer structure through a first isolation air valve, a second isolation air valve, and a buffer chamber. The isolation effect is verified by a humidity detection device and a micro-pressure detection device in the buffer chamber. In the event of abnormal back dampness, cabinet door not closed, abnormal air valve, smoke overheating, fault tripping, or fire linkage, the moisture or smoke diffusion path between the abnormal cabinet and adjacent cabinets can be cut off, thereby improving the moisture-proof safety and operational reliability of the row of power distribution cabinets in humid environments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an intelligent moisture-proof energy-saving power distribution cabinet according to the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the inter-cabinet heat and humidity relay unit of the present invention.

[0023] Figure 3 This is a schematic diagram of the cold spot evidence collection, dampness collection, and local circulation arrangement of the present invention.

[0024] Figure 4 This is a schematic diagram showing the connection of the partitioned shared dehumidification unit, the dry air distribution manifold, and the external exhaust auxiliary unit of the present invention.

[0025] Figure 5 This is a flowchart illustrating the moisture-proof and energy-saving control process of the present invention.

[0026] Figure 6 This is a schematic diagram illustrating the switching of operating states and the fallback mechanism for any anomalies in this invention.

[0027] 100. Distribution cabinet assembly; 110. Distribution cabinet body; 120. Cable inlet; 200. Inter-cabinet humidity and heat relay unit; 210. Relay housing; 220. Relay temperature equalization chamber; 230. Drying bypass chamber; 240. Dual-valve isolation buffer chamber; 241. First isolation air valve; 242. Second isolation air valve; 243. Buffer chamber; 244. Buffer chamber humidity detection device; 245. Buffer chamber micro-pressure detection device; 246. Pressure limiting micro-exhaust device; 247. Condensate guide channel; 300. Zoned shared dehumidification Units; 310, Dehumidification Module; 320, Dry Air Distribution Manifold; 330, Zoned Airflow Branch; 340, Electrically Controlled Airflow Valve; 350, Bypass Check Component; 400, Cold Spot Evidence Collection Unit; 410, Cabinet Interior Temperature and Humidity Collection Unit; 420, Cabinet Bottom Cold Spot Collection Point; 430, Electrically High-Risk Cold Spot Collection Point; 440, Cabinet Panel Cold Spot Collection Point; 450, Cable Inlet Moisture Collection Unit; 460, Cabinet Door Status Collection Component; 500, Local Circulation Fan; 600, External Exhaust Auxiliary Unit. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] This application provides an intelligent moisture-proof energy-saving distribution cabinet group 100, suitable for underground power distribution rooms, underground garage power distribution rooms, factory power distribution rooms, power distribution rooms in humid coastal areas, and applications involving rows of distribution cabinets where there is a risk of moisture backflow from cable trenches. In these scenarios, multiple distribution cabinets are typically installed side-by-side. Differences in load heating status, wall proximity, door opening status, cable inlet sealing status, and bottom temperature between different cabinets can easily lead to condensation at localized cold spots within individual cabinets. If each cabinet independently starts dehumidification, it will cause repeated dehumidification of low-risk cabinets and increased energy consumption; if adjacent cabinets are connected for extended periods, moisture from abnormally damp cabinets may enter adjacent cabinets.

[0030] This application enables the power distribution cabinet group 100 to switch between various operating states, including low-power standby, cold point observation, relay temperature equalization, zoned shared dehumidification, external exhaust auxiliary, dual-valve isolation, and maintenance reminder, through the cabinet-to-cabinet humidity and heat relay unit 200, dual-valve isolation buffer chamber 240, zoned shared dehumidification unit 300, and cold point evidence acquisition unit 400. This switching is based on the cabinet's cold point status, the inter-cabinet airflow status, and the abnormal backflow status, and the control results are applied to the isolation damper, local circulating fan 500, zoned shared dehumidification unit 300, and reminder unit.

[0031] In this application, the inter-cabinet heat and humidity relay unit 200 refers to an airflow transition structure set between two adjacent power distribution cabinets 110, which is used to form a uniform temperature airflow path between adjacent cabinets when safety conditions are met, or to form a dry air path for the zoned shared dehumidification unit 300 to enter the target cabinet.

[0032] In this application, the dual-valve isolation buffer chamber 240 refers to an isolation structure consisting of two isolation air valves and a buffer chamber 243 located between the two isolation air valves. This structure is used to cut off the moisture or smoke diffusion path between a cabinet and adjacent cabinets when a cabinet experiences abnormal dampness, cabinet door opening, air valve malfunction, overheating, or fire alarm signal, and the isolation effect is confirmed by the humidity and micro-pressure changes within the buffer chamber 243.

[0033] In this application, the cold point evidence collection unit 400 refers to a collection structure arranged in a location within the cabinet prone to condensation. Its collection location includes at least the bottom of the cabinet or the cable inlet 120, and includes at least one of the following: busbar insulator mounting base, near the lower contact of the circuit breaker, at the support of the incoming and outgoing copper busbars, or on the inner surface of the cabinet panel against the wall. The cold point evidence collection unit 400 is used to reflect the temperature status of the actual condensation-prone locations within the cabinet.

[0034] In this application, the zone-shared dehumidification unit 300 refers to a dehumidification structure that can provide dry air to one or more target cabinets via the dry air distribution manifold 320 and the dry bypass cavity 230. It may employ a semiconductor condensation dehumidification structure, a desiccant regeneration structure, a rotary dehumidification structure, or a combination of the above structures.

[0035] In this application, the operating state refers to the cabinet group's operating stage determined by the control unit based on collected data and equipment feedback. Operating states may include low-power standby, cold spot observation, relay temperature equalization, zoned shared dehumidification, external exhaust auxiliary, dual-valve isolation, and maintenance prompts. Each operating state corresponds to a clearly defined actuator action, entry condition, exit condition, priority, and timeout fallback.

[0036] Example 1: This example provides an intelligent moisture-proof energy-saving power distribution cabinet group 100. For example... Figures 1 to 4As shown, the distribution cabinet group 100 includes multiple parallel distribution cabinets 110, a cabinet-to-cabinet humidity and heat relay unit 200 located between adjacent distribution cabinets 110, a zone-shared dehumidification unit 300 connected to the cabinet-to-cabinet humidity and heat relay unit 200, a cold point evidence collection unit 400 located in each distribution cabinet 110, a cable inlet moisture collection unit 450, a cabinet door status collection device 460, a local circulating fan 500, and a control unit. The control unit switches the distribution cabinet group 100 between different moisture-proof operating states based on the cold point status of each cabinet, the airflow status between cabinets, and the abnormal moisture status.

[0037] like Figure 1 As shown, the distribution cabinet group 100 includes multiple distribution cabinets 110 arranged in parallel. The multiple distribution cabinets 110 can be arranged side-by-side laterally or in a row along the wall of the distribution room. Each distribution cabinet 110 contains a circuit breaker, busbars, terminal blocks, incoming and outgoing cables, and electrical mounting brackets. At least one inter-cabinet damp heat relay unit 200 is provided between two adjacent distribution cabinets 110.

[0038] like Figure 2 As shown, the inter-cabinet heat and humidity relay unit 200 includes a relay housing 210, a relay temperature equalization chamber 220, a drying bypass chamber 230, and a dual-valve isolation buffer chamber 240. The relay temperature equalization chamber 220, the drying bypass chamber 230, and the dual-valve isolation buffer chamber 240 are arranged in parallel within the relay housing 210, each forming an independent airflow path. The relay housing 210 is fixed between the side walls of two adjacent distribution cabinets 110, or it can be located at the top bridging position or the back bridging position of the cabinet. The relay housing 210 is connected to the distribution cabinet 110 via flanges, sealing rings, and fasteners to reduce unintended air leakage.

[0039] The relay housing 210 is preferably located in a non-energized compartment, a top independent air duct compartment, a rear independent air duct compartment, or a side independent ventilation cavity within the cabinet. The relay housing 210 does not extend into the exposed busbar area or the live terminal area of ​​the circuit breaker. Insulating grilles, flame-retardant partitions, foreign object protection mesh, and flame-retardant sealing rings are installed at the interfaces of the relay housing 210 to prevent foreign objects from entering the energized area and to reduce the possibility of flame or smoke spreading along the air duct. The relay housing 210 is made of flame-retardant insulating material, or it can be a metal housing connected to the protective grounding of the distribution cabinet.

[0040] The relay temperature equalization cavity 220 is disposed within the relay housing 210. One side of the relay temperature equalization cavity 220 is connected to one side of an adjacent distribution cabinet 110, and the other side is connected to the other side of an adjacent distribution cabinet 110. The relay temperature equalization cavity 220 is used to guide the warm air inside one cabinet to the other low-temperature, condensation-prone cabinet when the temperature inside one cabinet is high and there is no abnormal moisture return, thereby increasing the temperature of the cold spot area inside the low-temperature, condensation-prone cabinet and reducing the risk of condensation.

[0041] The cross-sectional area of ​​the relay temperature equalization chamber 220 can be determined based on the cabinet volume, the rated air volume of the local circulating fan 500, and the interface area on the side of the cabinet. Taking a common low-voltage distribution cabinet as an example, the effective ventilation cross-sectional area of ​​the relay temperature equalization chamber 220 is preferably 80 square centimeters to 400 square centimeters; for distribution cabinet groups 100 with larger cabinet volumes or longer air ducts, the ventilation cross-sectional area can be increased. The above range is a preferred range for ease of implementation, and the actual value is determined by on-site air volume testing, cabinet dimensions, and valve diameter calibration. In power distribution room scenarios with a lot of dust, a filter or dustproof screen can be installed at the inlet of the relay temperature equalization chamber 220, and a differential pressure detection device can be configured; when the differential pressure detection device outputs a blockage signal or a dust maintenance indicator is established, the control unit prohibits the corresponding relay temperature equalization chamber 220 from entering the relay temperature equalization state and outputs a filter maintenance prompt.

[0042] A drying bypass cavity 230 is disposed within the relay housing 210 and communicates with the zone-shared dehumidification unit 300. A bypass check valve 350 is provided between the drying bypass cavity 230 and the target cabinet. The bypass check valve 350 is used to prevent humid air in the target cabinet from flowing back into the zone-shared dehumidification unit 300 or other cabinets. The bypass check valve 350 can be a check valve, a resilient check disc, an electrically controlled check valve, or a one-way door with a resilient reset structure.

[0043] The dual-valve isolation buffer chamber 240 includes a first isolation air valve 241 near one side of the adjacent cabinet, a second isolation air valve 242 near the other side of the adjacent cabinet, and a buffer chamber 243 located between the two isolation air valves. A buffer chamber humidity detection element 244 and a buffer chamber micro-pressure detection element 245 are installed within the buffer chamber 243. The humidity detection element 244 detects humidity changes within the buffer chamber 243, and the micro-pressure detection element 245 detects pressure changes within the buffer chamber 243. Through these detections, it can be determined whether air leakage, moisture penetration, or backflow still exists after the isolation air valves are closed.

[0044] The volume of the buffer chamber 243 should be sufficient to form an independent detection space. Taking a low-pressure row cabinet as an example, the length of the buffer chamber 243 is preferably 30 mm to 150 mm, and the volume of the buffer chamber 243 is preferably 0.3 liters to 5 liters. This range is used to meet the needs of humidity detection and micro-pressure detection, and the actual value can be adjusted according to the thickness of the air valve, the gap between cabinets, and the installation position of the relay housing 210.

[0045] In an optional embodiment, the buffer chamber 243 is further provided with a pressure-limiting micro-ventilation component 246. The pressure-limiting micro-ventilation component 246 has a unidirectional venting structure facing the outside of the cabinet or a safety venting channel. When the pressure inside the buffer chamber 243 briefly increases during the closure of the two isolation valves, the pressure-limiting micro-ventilation component 246 releases the overpressurized gas inside the buffer chamber 243; after the pressure in the buffer chamber 243 returns to the set range, the pressure-limiting micro-ventilation component 246 resets and closes, so that the buffer chamber 243 forms an isolated space for humidity and micro-pressure detection.

[0046] In an optional embodiment, a condensate drainage channel 247 is provided at the bottom of the dual-valve isolation buffer chamber 240. The condensate drainage channel 247 is connected to the drain port, and a check valve or liquid collection structure is provided at the drain port to prevent condensate from flowing back into the distribution cabinet 110. The slope of the condensate drainage channel 247 faces the drain port, so that any condensate that may be generated in the buffer chamber 243 can be discharged along the drainage channel. When the humidity in the buffer chamber 243 is close to saturation, the micro-pressure change in the buffer chamber is abnormal, and the condensate drainage channel 247 shows a drainage signal, the control unit marks the inter-cabinet humidity and heat relay unit 200 as a buffer chamber condensation risk state, keeps the corresponding isolation air valve closed, prohibits the inter-cabinet humidity and heat relay unit 200 from participating in relay temperature equalization and zoned shared dehumidification air supply, and outputs a maintenance reminder.

[0047] In an optional embodiment, a relay cold point temperature detector and a relay humidity detector are installed inside the relay temperature equalization cavity 220. The relay cold point temperature detector is located on the low-temperature side of the inner wall of the relay temperature equalization cavity 220 and is used to determine whether the relay temperature equalization cavity 220 itself becomes a new condensation point. The relay humidity detector is used to detect the humidity of the airflow passing through the relay temperature equalization cavity 220 to confirm whether a humidity increase occurs during the temperature equalization process between cabinets.

[0048] like Figure 3 As shown, each distribution cabinet 110 is equipped with a cold point evidence collection unit 400. The cold point evidence collection unit 400 includes a centralized collection module and multiple sub-collection components distributed in easily condensing locations within the cabinet. The centralized collection module is located on the inner wall, back panel, or low-voltage installation area of ​​the distribution cabinet 110, and is used to collect the data output from each sub-collection component. The multiple sub-collection components include a cabinet interior temperature and humidity collection unit 410, a cabinet bottom cold point collection point 420, an electrical high-risk cold point collection point 430, and a cabinet panel cold point collection point 440. A cable inlet moisture return collection unit 450 and a cabinet door status collection component 460 are communicatively or electrically connected to the centralized collection module to output the cable inlet moisture return status and cabinet door status to the control unit.

[0049] The cabinet temperature and humidity acquisition unit 410 is located in the upper-middle ventilation area of ​​the distribution cabinet 110 to collect the air temperature and relative humidity inside the cabinet. The cabinet bottom cold spot acquisition point 420 is located near the cabinet bottom steel plate, cable inlet 120, or above the cable trench to collect the temperature of cold spots at easily condensing locations at the bottom of the cabinet. The electrical high-risk cold spot acquisition point 430 is located near the busbar insulator mounting base, circuit breaker lower contacts, incoming / outgoing copper busbar supports, or terminal blocks to collect the temperature of cold spots near critical electrical installation locations. The cabinet panel cold spot acquisition point 440 is located on the inner surface of the cabinet panel against the wall, the cabinet panel against the exterior wall, or the cabinet panel affected by the air conditioning exhaust to collect the temperature of the inner surface of the cabinet panel.

[0050] The cable inlet moisture collection unit 450 is installed near the cable inlet 120, the cable trench sealing layer, or the inlet hole at the bottom of the cabinet. The cable inlet moisture collection unit 450 can employ at least one of the following: a humidity sensor, a thin-film water vapor sensor, a water accumulation detection electrode, or a condensate detection plate, to determine if moisture is rising from the cable trench, the sealing layer is failing, or there is localized moisture buildup at the bottom of the cabinet. The cabinet door status collection unit 460 is installed at the edge of the cabinet door, at the corresponding position on the door frame, or near the door lock mechanism. The cabinet door status collection unit 460 can employ a limit switch, a magnetic switch, a proximity switch, or a door lock auxiliary contact to detect whether the cabinet door is open, closed, or not fully closed.

[0051] The centralized acquisition module of the cold point evidence acquisition unit 400 is fixed inside the distribution cabinet 110 by insulating fasteners without changing the installation gap of live parts, obstructing the circuit breaker operating mechanism, or interfering with the maintenance operations of busbars, secondary circuits, and terminal blocks. The leads between each sub-acquisition component and the centralized acquisition module are arranged along the existing wiring channels in the cabinet or independent low-voltage wiring channels, maintaining a safe distance from primary live parts. The centralized acquisition module can number, cache, and forward the acquired values ​​of each sub-acquisition component, enabling the control unit to identify the acquisition point location, acquisition time, acquired value, and valid identifier.

[0052] A local circulating fan 500 is installed inside the distribution cabinet 110 to guide airflow through the cabinet bottom, cable inlet 120, busbar area, and circuit breaker area. The local circulating fan 500 can be installed on the side wall, bottom, or upper duct of the cabinet, with its exhaust direction preferentially facing the areas of the cold spot collection point 420 and the electrical high-risk cold spot collection point 430 at the bottom of the cabinet. The local circulating fan 500 has at least three operating positions: off, low speed, and normal speed. When there is a high level of dust in the underground distribution room or abnormal pressure difference in the filter components, the control unit restricts the local circulating fan 500 from operating at high airflow.

[0053] like Figure 1 and Figure 4As shown, the zoned shared dehumidification unit 300 includes a dehumidification inlet, a dehumidification outlet, a dehumidification module 310, a dehumidification operation feedback device, and a dry air distribution manifold 320. The dehumidification inlet is used to receive the airflow from the cabinet requiring dehumidification, and the dehumidification outlet is used to output dry air to the dry air distribution manifold 320. The dry air distribution manifold 320 is provided with multiple zoned air guide branches 330, each zoned air guide branch 330 being connected to the dry bypass cavity 230 of the corresponding inter-cabinet humidity and heat relay unit 200. Each zoned air guide branch 330 is equipped with an electrically controlled air guide valve 340 and a bypass check valve 350.

[0054] The bypass check valve 350 can be configured with a position feedback device or a branch pressure differential detection device. The position feedback device is used to provide feedback on the open, closed, or stuck status of the bypass check valve 350, while the branch pressure differential detection device is used to detect the pressure difference change between the zone air guide branch 330 and the target cabinet. The control unit determines whether the bypass check valve 350 is abnormal based on the position feedback of the bypass check valve 350, the branch pressure differential change, or the detection result of the humidity on the target cabinet side increasing in the reverse direction towards the zone air guide branch 330. When the bypass check valve 350 is stuck, not fully closed, not fully open, or has a backflow tendency, the control unit closes the electrically controlled air guide valve 340 on the corresponding zone air guide branch 330 and prohibits the zone-shared dehumidification unit 300 from supplying air to that cabinet.

[0055] The control unit selects to open one or more zone air duct branches 330 based on the target cabinet's cold point status, abnormal isolation status, and dehumidification recovery status, allowing dry air to enter the target cabinet. When the target cabinet is in a dual-valve isolation state or the corresponding bypass check valve 350 is malfunctioning, the corresponding zone air duct branch 330 remains closed.

[0056] The dehumidification module 310 can employ a semiconductor condensation dehumidification structure, a desiccant regeneration structure, a rotary dehumidification structure, or a composite dehumidification structure. In underground high-moisture scenarios, the dehumidification module 310 is preferably configured with a condensate diversion structure; in coastal or salt spray scenarios, the dehumidification module 310, the dry air distribution manifold 320, the zoned air guide branch 330, the air valve shaft, and fasteners are preferably made of corrosion-resistant materials or have corrosion-resistant coatings; in dusty scenarios, filters and differential pressure detectors are installed at the dehumidification air inlet or the inlet of the dry bypass cavity 230. The differential pressure detector is used to determine the clogging status of the filter. When the differential pressure is abnormal, the control unit limits the continuous operating time of the zoned shared dehumidification unit 300 and outputs a maintenance prompt.

[0057] The control unit is connected to the cabinet temperature and humidity acquisition unit 410, the cabinet bottom cold point acquisition point 420, the electrical high-risk cold point acquisition point 430, the cabinet panel cold point acquisition point 440, the cable inlet moisture acquisition unit 450, the cabinet door status acquisition unit 460, the buffer chamber humidity detection unit 244, the buffer chamber micro-pressure detection unit 245, the relay cold point temperature detection unit, the relay humidity detection unit, the position feedback unit or branch differential pressure detection unit of each isolation air valve and bypass check valve 350, the local circulation fan 500, and the zone shared dehumidification unit 300. The control unit is also connected to the outside air temperature and humidity acquisition unit, the exhaust check valve, the exhaust filter differential pressure detection unit, and the exhaust protection structure status detection unit. It can also be connected to the cabinet smoke detection unit, the cabinet over-temperature detection unit, the circuit breaker auxiliary contacts, the power distribution room fire alarm system interface, or the upper-level monitoring system communication interface to obtain the status required for exhaust auxiliary judgment, fire linkage status, and fault trip signal.

[0058] In an optional embodiment, the distribution cabinet group 100 further includes an external exhaust auxiliary unit 600 and an external air temperature and humidity acquisition device. The external exhaust auxiliary unit 600 includes an external exhaust vent, an external exhaust check valve, a rain cover, an insect screen, and an external exhaust filter. The external air temperature and humidity acquisition device is located outside the external exhaust vent or at a ventilation location outside the distribution room, and is used to collect external air temperature and relative humidity. The external exhaust filter may be equipped with a differential pressure detection device, the external exhaust check valve may be equipped with an opening / closing feedback device, and the rain cover and insect screen may be equipped with clogging detection devices or maintenance inspection positions. The control unit determines whether to allow entry into the external exhaust auxiliary state based on the external air temperature and humidity, the feedback from the external exhaust check valve, the differential pressure of the external exhaust filter, and the status of the rain cover and insect screen.

[0059] The alarm and maintenance notification unit connects to the control unit and is used to output alerts for abnormal backflow, improperly positioned air valves, dehumidifier unit malfunctions, continuous condensation near cold spots, sensor failures, buffer chamber 243 isolation failures, and fire alarm interlocking. The alarm and maintenance notification unit may include an audible and visual alarm, a display screen, a communication module, or an interface to the power distribution room monitoring backend.

[0060] Example 2: This example provides a moisture-proof and energy-saving control process for a power distribution cabinet group 100. For example... Figure 5 As shown, the process can be performed by a control unit and includes the following steps.

[0061] S100, the control unit acquires the following data for each distribution cabinet 110: cabinet internal air temperature, cabinet internal relative humidity, cabinet bottom cold point temperature, electrical high-risk cold point temperature, cabinet panel cold point temperature, cable inlet 120 backflow status, cabinet door open, closed, or not closed tightly status, local circulating fan 500 status, isolation damper open position feedback, closed position feedback, and incomplete position feedback, relay temperature and humidity chamber 220, buffer chamber 243 humidity, buffer chamber 243 micro-pressure, bypass check valve 350 position feedback or branch pressure difference status, zone shared dehumidification unit 300 operating status, zone shared dehumidification unit 300 filter pressure difference status, exhaust filter pressure difference status, outside air temperature, outside relative humidity, exhaust check structure feedback, rainproof structure status, insect-proof structure status, and fire alarm linkage status.

[0062] Fire alarm status can be provided by the power distribution room fire alarm system, smoke detectors inside cabinets, over-temperature detectors inside cabinets, circuit breaker fault trip signals, or the superior monitoring system. After receiving the fire alarm status, the control unit will mark the corresponding cabinet as a fire-locked cabinet and prohibit that cabinet from participating in relay temperature equalization, zoned shared dehumidification, and external exhaust auxiliary actions.

[0063] To improve the reliability of the acquired data, the control unit performs validity checks on the acquired data. Validity checks include range checks, abrupt change checks, repeatability checks, and communication checks. Range checks determine whether the acquired value falls within the sensor's allowable measurement range; abrupt change checks determine whether changes within adjacent acquisition cycles significantly exceed the rate of physical change of the cabinet; repeatability checks determine cases where the sensor outputs the same value for an extended period; and communication checks determine whether communication interruptions have occurred between the acquisition unit and the control unit.

[0064] The data acquisition cycle can be set according to the power distribution room environment, preferably 10 to 60 seconds. For humid seasons, underground power distribution rooms, or cabinets with a history of moisture accumulation, the acquisition cycle can be set to 10 to 30 seconds. For dry environments or low-load operation scenarios, the acquisition cycle can be set to 30 to 60 seconds. The above values ​​are initial settings and can be calibrated based on cabinet volume, air duct resistance, sensor response speed, and historical moisture accumulation frequency after field operation. If moisture accumulation occurs at cable inlet 120, cabinet door is opened, or humidity increases in buffer chamber 243, the control unit automatically switches to a shorter acquisition cycle.

[0065] The S200 control unit generates cold spot observation conditions, cabinet temperature uniformity conditions, zoned dehumidification conditions, external exhaust auxiliary conditions, and dual-valve isolation conditions based on the collected data. These conditions are used for subsequent operation state switching. The control unit does not obtain a single score by adding multiple collected values; instead, each condition serves as an entry condition, exit condition, prohibition condition, or recovery condition for the operation state, respectively.

[0066] Cold point observation conditions are used to determine whether a cabinet needs to enter cold point observation mode. The control unit determines the dew point temperature of the air inside the cabinet based on the air temperature and relative humidity inside the cabinet, and then compares the cold point at the bottom of the cabinet, the electrical high-risk cold point, the cold point on the cabinet panel, and the relay cold point with the dew point temperature of the air inside the cabinet.

[0067] Preferably, the dew point temperature of the air inside the cabinet can be obtained by using a preset dew point table, or it can be calculated using the following approximate model: ; ; In the formula, Intermediate variables for dew point calculation; RH is the relative humidity collected inside the cabinet, in percentage; T is the air temperature collected inside the cabinet, in degrees Celsius; a and b are empirical constants, in this embodiment a is 17.27 and b is 237.7 degrees Celsius; This is the dew point temperature of the air inside the cabinet, in degrees Celsius.

[0068] After determining the dew point temperature of the air inside the cabinet, the control unit compares the difference between the temperature of each cold point and the dew point temperature of the air inside the cabinet. This difference is called the dew point safety margin. Preferably, when the dew point safety margin is greater than or equal to 5 degrees Celsius, the corresponding cold point is considered to be in a safe state; when the dew point safety margin is greater than or equal to 3 degrees Celsius and less than 5 degrees Celsius, the corresponding cold point is considered to be in an observation state; when the dew point safety margin is greater than or equal to 1 degree Celsius and less than 3 degrees Celsius, the corresponding cold point is considered to be in a processing state; when the dew point safety margin is less than 1 degree Celsius, the corresponding cold point is considered to be in an emergency processing state. The above values ​​are initial calibration values, which can be adjusted on-site according to the cabinet installation location, sensor accuracy, operating temperature and humidity of the power distribution room, and historical condensation records. More conservative observation conditions are used for cabinets in high humidity seasons, underground power distribution rooms, and those with cable trench moisture records.

[0069] The preset dew point table can be generated from the correspondence between the cabinet's internal air temperature, relative humidity, and dew point temperature. Temperature ranges can be defined according to sensor measurement accuracy or site requirements, and relative humidity ranges can be defined according to sensor measurement accuracy or moisture control needs. When the collected value lies between adjacent table nodes, the control unit can approximate the value using adjacent nodes or use linear interpolation to obtain the cabinet's internal air dew point temperature. Low-cost controllers preferably use a lookup table method to reduce real-time computational burden.

[0070] The inter-cabinet temperature equalization condition is used to determine whether warm airflow can be used to equalize the temperature between adjacent cabinets. The control unit identifies distribution cabinets 110 where the cold point is in a safe state and the backflow of moisture at cable inlet 120 is not established as candidate supply cabinets, and distribution cabinets 110 where the cold point is in an observation or handling state as candidate rescue cabinets. The control unit determines that the inter-cabinet temperature equalization condition is established when the air temperature inside the candidate supply cabinet is higher than that inside the candidate rescue cabinet, and the cabinet doors of both candidate supply cabinets and candidate rescue cabinets are closed, the position feedback of the two isolation air valves is consistent with the control state, the humidity in the buffer chamber 243 does not meet the condition of continuous increase, and the fire linkage state is not established. The candidate rescue cabinet must also meet the following conditions: it is not in a dual-valve isolation state, the relay temperature equalization chamber 220 itself is not close to condensation, and the corresponding bypass check valve 350 has not experienced backflow.

[0071] In a preferred embodiment, when the air temperature inside the candidate supply cabinet is 2 to 6 degrees Celsius higher than the air temperature inside the candidate recipient cabinet, the control unit allows for the formation of uniform temperature conditions between cabinets. This temperature difference range is the initial calibration value, and the actual value can be adjusted according to the cabinet volume, airflow path length, and the 500 m³ / h airflow of the local circulating fan. If the candidate supply cabinet has a dust maintenance sign, the control unit restricts it from being used as a supply cabinet to prevent large airflow from causing dust to rise and adhere to the busbar or circuit breaker contacts.

[0072] The zoned dehumidification conditions are used to determine whether the zoned shared dehumidification unit 300 needs to be activated. If a cabinet's cold spot is in a processing or emergency processing state, and the temperature uniformity between cabinets is not met, the control unit identifies that cabinet as a candidate cabinet for zoned dehumidification. If multiple cabinets simultaneously meet the zoned dehumidification candidate conditions, the control unit prioritizes cabinets with electrical high-risk cold spots in an emergency processing state, followed by cabinets with bottom cold spots in an emergency processing state, and then cabinets with continuously decreasing dew point safety margins. When multiple distribution cabinets 110 are at the same priority, the control unit determines which distribution cabinet 110 needs to be supplied with dry air based on the duration of the risk, the number of historical backflows, and the availability of the air supply path between the zoned shared dehumidification unit 300 and the drying bypass cavity 230. The availability of the air supply path can be determined based on the status of the zoned air guide branch 330, the electrically controlled air guide valve 340, the bypass check valve 350, the branch differential pressure detection device, and the dehumidification operation feedback device. The control unit writes the identified distribution cabinet 110 requiring dry air supply, the triggering reason, and the status of the corresponding actuator into the cabinet status record. Cabinets in dual-valve isolation mode are not connected to the conventional zone-shared dehumidification air supply path.

[0073] The external exhaust auxiliary conditions are used to determine whether the humid air inside the cabinet can be exhausted outside. The control unit determines the dew point of the air inside the cabinet based on the data collected by the cold point evidence acquisition unit 400, and determines the dew point of the outside air based on the data collected by the outside air temperature and humidity acquisition unit. The control unit determines that the external exhaust auxiliary conditions are met when the outside air dew point is lower than the inside air dew point, the cabinet door is closed, the cable inlet 120 is not damp, the feedback of the external exhaust check valve is consistent with the control status, and the rain cover, insect screen, and external exhaust filter are not blocked. If the outside humidity continues to rise, the outside low-temperature airflow causes the cold point temperature of the cabinet panel to drop rapidly, the cabinet door is open, the cable inlet 120 becomes damp, the feedback of the external exhaust check valve is inconsistent with the control status, or any of the rain cover, insect screen, and external exhaust filter is blocked, the control unit determines that the external exhaust auxiliary conditions are not met, or exits the external exhaust auxiliary state.

[0074] The dual-valve isolation condition is used to determine whether a cabinet needs to be isolated from adjacent cabinets. The control unit determines that the dual-valve isolation condition is met under the following circumstances: the cabinet door remains open for more than the confirmation time; the cable inlet 120 experiences backflow; the cable inlet backflow acquisition unit 450 outputs a bottom water accumulation signal; the humidity in the buffer chamber 243 continuously increases; the micro-pressure in the buffer chamber 243 is abnormal; either of the two isolation air valves is not in position; any key acquisition result of the cold point evidence acquisition unit 400 fails; the cable inlet backflow acquisition unit 450 fails; the humidity detection device 244 in the buffer chamber fails; the micro-pressure detection device 245 in the buffer chamber fails; there is over-temperature inside the cabinet; a smoke signal is detected; a circuit breaker trip signal is detected; or a fire alarm linkage status is established. Preferably, the cabinet door opening confirmation time is 30 to 120 seconds, the air valve not in position confirmation time is 5 to 15 seconds, and the buffer chamber 243 humidity abnormality confirmation time is 30 to 180 seconds. These confirmation times can be adjusted during on-site trial operation based on the cabinet door usage frequency, air valve operation time, and the humidity of the power distribution room.

[0075] The S300 control unit switches the power distribution cabinet group 100 between different operating states based on cold spot observation conditions, cabinet temperature uniformity conditions, zoned dehumidification conditions, external exhaust auxiliary conditions, and dual-valve isolation conditions. The operating states include low-power standby state, cold spot observation state, relay temperature uniformity state, zoned shared dehumidification state, external exhaust auxiliary state, dual-valve isolation state, and maintenance reminder state.

[0076] The same cabinet operates in one main state at any given time. When the entry conditions for multiple states are met simultaneously, the control unit determines the execution state according to priority. The priorities, from highest to lowest, are: maintenance reminder state, dual-valve isolation state, zone-shared dehumidification state, relay temperature equalization state, external exhaust auxiliary state, cold spot observation state, and low-power standby state. Dual-valve isolation state and relay temperature equalization state are mutually exclusive; the normal air supply path of dual-valve isolation state and zone-shared dehumidification state is mutually exclusive; and maintenance reminder state and automatic recovery states are mutually exclusive.

[0077] The low-power standby mode is used when all cold spots in the cabinets are in a safe state and there is no abnormal backflow of moisture. In this state, the local circulating fan runs at low speed (500 rpm) or intermittently, the zone-shared dehumidification unit (300 rpm) is shut down, and the isolation dampers remain closed or slightly open according to maintenance ventilation requirements. The low-power standby mode will exit when any cold spot enters observation mode, an abnormal backflow of moisture is detected, a fire alarm signal is triggered, or an actuator malfunctions.

[0078] The cold spot observation state is used when a specific cold spot is under observation. In this state, the control unit increases the data acquisition frequency of the corresponding cabinet and briefly activates the local circulating fan 500 to enhance airflow near the cold spot. If the cold spot returns to a safe state, the control unit returns the distribution cabinet group 100 to a low-power standby state. If the cold spot enters the processing state, the control unit continues to determine whether the relay temperature equalization state or the zone-shared dehumidification state can be entered. The observation period for the cold spot observation state is preferably 5 to 20 minutes. If the observation exceeds the time limit and the cold spot has not returned to a safe state, the system enters the relay temperature equalization state or the zone-shared dehumidification state; if critical data acquisition fails, the system enters the maintenance prompt state.

[0079] The relay temperature equalization state is used when there are candidate supply cabinets and candidate rescue cabinets. In this state, the corresponding two isolation air valves open at a preset opening degree, and the local circulation fan 500 guides the warm airflow from the candidate supply cabinet through the relay temperature equalization chamber 220 into the candidate rescue cabinet. The relay cold point temperature detection device and the relay humidity detection device continuously provide feedback on the status inside the relay temperature equalization chamber 220. If the relay temperature equalization chamber 220 itself approaches condensation, the control unit exits the relay temperature equalization state. The retention time of the relay temperature equalization state is preferably 5 to 30 minutes. If the candidate rescue cabinet has not returned to a safe state after the retention time expires, the control unit enters the zone-sharing dehumidification state; if at the same time there is abnormal backflow, fire alarm, or air valve not in position, it enters the dual-valve isolation state or maintenance reminder state.

[0080] The zone-shared dehumidification mode is used when the temperature between cabinets cannot be restored to the safe state of the cooling point, or when multiple cabinets are simultaneously in processing mode. In this mode, the zone-shared dehumidification unit 300 is activated, and dry air enters the target cabinet through the dehumidification outlet, dry air distribution manifold 320, zone air guide branch 330, drying bypass cavity 230, and bypass check valve 350. The target cabinet is a cabinet that is not isolated by dual valves and meets the zoned dehumidification conditions. The continuous operation time of the zone-shared dehumidification mode is preferably 10 to 60 minutes. If the cooling point still has not been restored to the safe state after continuous operation, or if the dehumidification operation feedback device displays a fault, the control unit enters the maintenance prompt state. When multiple distribution cabinets 110 are simultaneously in emergency handling mode and the air supply capacity of the shared dehumidification unit 300 is insufficient to cover all target cabinets at the same time, the control unit will supply air in a time-sharing manner according to the priority of high-risk cold points, cold points at the bottom of the cabinet, and risk duration. After a single target cabinet completes a dehumidification maintenance cycle, if the cold point does not continue to deteriorate, the control unit will switch to the next target cabinet and retain the cabinet that has not been restored as the target for the next round of dehumidification.

[0081] The external exhaust auxiliary state is used when the humidity inside the cabinet is high and the outside air meets the dehumidification requirements. In this state, the control unit determines the dew point of the air inside the cabinet based on the data collected by the cold point evidence acquisition unit 400, and determines the dew point of the outside air based on the data collected by the outside air temperature and humidity acquisition unit. When the outside air dew point is lower than the inside air dew point, the cabinet door is closed, the cable inlet 120 is not damp, the feedback from the external exhaust check valve is consistent with the control state, and the rain cover, insect screen, and external exhaust filter are not blocked, the external exhaust auxiliary unit 600 is controlled to exhaust the humid air from the corresponding distribution cabinet 110. The external exhaust auxiliary unit 600 includes an external exhaust vent, an external exhaust check valve, a rain cover, an insect screen, and an external exhaust filter. The external exhaust auxiliary state is limited by outside humidity, outside dew point, cabinet door status, cable inlet 120 dampness, and cold winter air. The duration of the external exhaust auxiliary state is preferably 3 to 15 minutes. If the outside air conditions worsen or the cabinet cold point temperature drops too quickly, the control unit exits the external exhaust auxiliary state.

[0082] The dual-valve isolation state is used when a cabinet meets the dual-valve isolation conditions. In this state, the control unit closes the corresponding isolation air valves on both sides of the cabinet and prohibits the cabinet from participating in the normal air supply path of the relay temperature equalization state and the zoned shared dehumidification state. The buffer chamber humidity detection element 244 and the buffer chamber micro-pressure detection element 245 continue to detect the isolation effect. If the abnormality is resolved and the recovery confirmation time has elapsed, the control unit can put the cabinet into a cold point observation state or a low-power standby state. The recovery confirmation time is preferably 10 to 30 minutes. If the abnormality is not resolved after the dual-valve isolation state has lasted for 30 to 120 minutes, or if the humidity in the buffer chamber 243 continues to rise, the control unit enters a maintenance prompt state. After the fire alarm linkage is deactivated, the control unit does not directly restore the connection between cabinets. Instead, it first confirms that the smoke signal, over-temperature signal, and circuit breaker trip signal inside the cabinet have all been deactivated. Then, it confirms that the humidity and micro-pressure in the buffer chamber are within a stable range. After confirmation, the control unit briefly opens the corresponding isolation valve with a small opening to resume observation. Only when there is no increase in humidity, abnormal micro-pressure, or smoke / over-temperature signal during the observation period is the corresponding cabinet allowed to enter the cold point observation state or low-power standby state.

[0083] The maintenance alert status is used when the risk remains after an abnormal isolation event, or when critical actuators report abnormalities. Actuator feedback abnormalities include: isolation damper not in place, malfunction of the zone-shared dehumidification unit 300, abnormal feedback from the local circulating fan 500 stopping, invalid data acquisition results, and failure to disengage the fire alarm interlock. In the maintenance alert status, the control unit controls the alarm and maintenance alert units to output maintenance alerts and controls the corresponding power distribution cabinet 110 to not participate in relay temperature equalization and regular zone-shared dehumidification air supply. The maintenance alert status can be manually triggered or automatically deactivated by the control unit after the fault is resolved and an observation period has elapsed. The preferred observation period is 30 to 60 minutes.

[0084] S400, the control unit executes the corresponding moisture-proof action according to the determined operating state, and obtains the feedback result of the actuator, and uses the feedback result of the actuator as the basis for state switching in the next acquisition cycle.

[0085] When the distribution cabinet group 100 is in the relay equalization temperature state, the control unit controls the opening of the isolation air valves corresponding to the candidate supply cabinets and candidate support cabinets, and controls the local circulating fan 500 to form a short-term airflow from the supply cabinet to the support cabinet. When the airflow passes through the relay equalization temperature chamber 220, the relay cold point temperature detection device and the relay humidity detection device continuously feed back the safety status of the relay chamber to the control unit. If the cold point of the support cabinet returns to the safe state, the control unit reduces the opening of the air valve and exits the relay equalization temperature state.

[0086] When the distribution cabinet group 100 is in zone-shared dehumidification mode, the control unit starts the zone-shared dehumidification unit 300 and connects the target zone air guide branch 330 in the dry air distribution manifold 320 with the corresponding dry bypass cavity 230 of the target cabinet. The bypass check valve 350 of the target cabinet is opened, while the bypass check valves 350 of the other cabinets remain closed. The operating time of the zone-shared dehumidification unit 300 is limited by the dehumidification operation feedback device and the cold point recovery status of the target cabinet. If the dehumidification operation feedback device displays a fault, the control unit stops the zone-shared dehumidification and enters a maintenance prompt.

[0087] When the distribution cabinet group 100 is in a dual-valve isolation state, the control unit closes the isolation air valves on both sides of the abnormal cabinet and confirms the isolation effect through the buffer chamber humidity detector 244 and the buffer chamber micro-pressure detector 245. If the humidity in the buffer chamber 243 continues to rise, it indicates that there is still a tendency for moisture to enter the buffer chamber 243 from the abnormal cabinet side. The control unit maintains the dual-valve isolation and outputs a maintenance prompt. If the humidity in the buffer chamber 243 decreases and the micro-pressure returns to stability, the control unit removes the isolation candidate mark after the confirmation time.

[0088] The feedback data after the above execution is returned to the next acquisition cycle. The feedback data includes the actual position of the air valve, the air valve action time, the humidity change in the buffer chamber 243, the micro-pressure change in the buffer chamber 243, the cold spot recovery status, the operating status of the zone-shared dehumidification unit 300, and the maintenance reminder status. The control unit uses the above feedback data as the basis for subsequent status switching.

[0089] In one implementation, the control unit generates a cabinet status record. The cabinet status record includes at least the cabinet number, acquisition time, acquisition point number, acquired value, validity flag, current operating status, actuator number, actuator feedback, anomaly type, duration, and maintenance flag. The cabinet status record can be stored locally or sent to the power distribution room monitoring system.

[0090] Example 3 illustrates the working process of this application under typical operating conditions. For example... Figure 5 and Figure 6 As shown, this application can handle at least the following working conditions: low temperature cabinets prone to condensation, multiple cabinets experiencing common dampness, cabinets with abnormal back dampness, fire alarm interlocking, and abnormal data collection or execution feedback.

[0091] In the first operating condition, one distribution cabinet 110 is a high-load cabinet, and the adjacent distribution cabinet 110 is a low-temperature, condensation-prone cabinet. The high-load cabinet has more heating elements, resulting in a higher internal temperature, while the cold spots at the bottom and electrical high-risk cold spots are in a safe state. The low-temperature, condensation-prone cabinet is located near a wall or cable trench, and its cold spot at the bottom is close to the dew point of the air inside the cabinet. The control unit determines that the high-load cabinet is suitable as a candidate supply cabinet, and the low-temperature, condensation-prone cabinet is suitable as a candidate backup cabinet, and the relay temperature equalization chamber 220 is not close to condensation. The control unit puts the distribution cabinet group 100 into relay temperature equalization mode. Warm airflow enters the relay temperature equalization chamber 220 from the high-load cabinet, and then enters the low-temperature, condensation-prone cabinet. After the temperature of the cold spot at the bottom of the low-temperature, condensation-prone cabinet rises, the risk of condensation decreases. During this process, the zone-shared dehumidification unit 300 can remain closed, thus reducing the energy consumption of active dehumidification.

[0092] In the second operating condition, multiple distribution cabinets 110 are in a high-humidity environment, and the electrical high-risk cold spots in multiple cabinets are close to condensation. At this time, the temperature equalization condition between cabinets may not be possible, or the relay temperature equalization cannot restore the cold spot to a safe state. The control unit puts the distribution cabinet group 100 into a zoned shared dehumidification state. The zoned shared dehumidification unit 300 supplies dry air to the target cabinets via the dry air distribution manifold 320, zoned air duct 330, and dry bypass cavity 230. If the electrical high-risk cold spot risk of a particular cabinet is higher, that cabinet is dehumidified first; after that cabinet is restored, other target cabinets are dehumidified. This avoids all cabinets being equipped with or starting high-power dehumidifiers simultaneously.

[0093] In the third operating condition, if the cable inlet moisture collection unit 450 of a distribution cabinet 110 detects moisture, or if the cabinet door remains open for more than the confirmation time, the control unit marks the cabinet as an isolation candidate and enters a dual-valve isolation state. The corresponding isolation air valves on both sides of the cabinet close. The buffer chamber humidity detection element 244 and the buffer chamber micro-pressure detection element 245 continue to monitor the isolation effect. If the humidity in the buffer chamber 243 continues to rise, the control unit enters a maintenance prompt state and prompts maintenance personnel to check the cable trench sealing, cabinet door sealing, or air valve sealing status. This process can reduce the diffusion of moisture from the abnormal cabinet to adjacent cabinets.

[0094] In the fourth operating condition, if any distribution cabinet 110 experiences smoke, overheating, circuit breaker tripping, or a fire alarm signal from an upstream unit, the control unit will stop that cabinet from participating in relay equalization and zoned shared dehumidification air supply, close the isolation dampers on both sides of the cabinet, and enter a dual-valve isolation state or maintenance prompt state. If the fire alarm signal is not released, the control unit will remain locked and will not automatically restore the inter-cabinet communication path.

[0095] In the fifth operating condition, data from a cold point acquisition point fails or the air valve feedback is abnormal. The control unit switches the relevant status of the corresponding cabinet to a conservative handling mode. The conservative handling mode includes extending the cold point observation time, restricting the opening of the relay temperature equalization channel, prohibiting the abnormal cabinet from participating in the zone-shared dehumidification air supply path, and outputting a maintenance prompt. If the backup cold point acquisition point is available, the control unit can continue to maintain basic moisture-proof operation based on the backup cold point acquisition point and the cabinet's temperature and humidity acquisition unit 410; if all critical acquisition points are unavailable, the control unit enters the maintenance prompt state.

[0096] Example 4 illustrates the installation, calibration, and modification methods of this application.

[0097] For newly built distribution cabinet group 100, relay interfaces can be reserved in the side panels, top air duct compartments, or rear air duct compartments of adjacent distribution cabinets 110. The inter-cabinet humidity and heat relay unit 200 is fixed between adjacent cabinets via relay housing 210, sealing flanges, and fasteners. The zoned shared dehumidification unit 300 can be installed on the top of the cabinet group, at the side of the cabinet group, or inside an independent dehumidification box. The dehumidification air outlet is connected to each inter-cabinet humidity and heat relay unit 200 via a dry air distribution manifold 320.

[0098] For the renovation of existing distribution cabinet group 100, the inter-cabinet heat and humidity relay unit 200 can be set as a bridging relay box. The bridging relay box is installed on the top or back of the adjacent cabinet and connected to the cabinet through a short-circuit air duct. This renovation method can reduce the impact on the primary electrical structure of the cabinet. For cabinets where side wall interfaces cannot be opened, top interfaces or back interfaces can be used to connect to the relay temperature equalization cavity 220 and the drying bypass cavity 230.

[0099] When retrofitting an old cabinet, installers should first confirm the locations of the busbar compartment, switch compartment, cable compartment, and secondary circuits within the cabinet. Relay interfaces should be preferentially located in non-energized compartments or independent ventilation duct compartments, avoiding exposed busbar areas, circuit breaker moving and stationary contact areas, and areas with dense secondary wiring harnesses. After installation, a sealing test, a damper operation test, a 243 micro-pressure reference test for the buffer chamber, a cold spot acquisition point effectiveness test, and a protective grounding test should be performed.

[0100] The inter-cabinet damp heat relay unit 200 can be equipped with replaceable flange plates and adjustable sealing rings to adapt to distribution cabinets of different widths, depths, and side panel opening positions. The replaceable flange plate has multiple sets of mounting holes for connection to different cabinet side walls or top bridging plates. The adjustable sealing ring is used to fill the installation gap between the relay housing 210 and the cabinet side wall.

[0101] When installing the cold spot evidence collection unit 400, priority should be given to covering the bottom of the cabinet, cable entry point 120, electrical high-risk areas, and the inner surface of the cabinet panel against the wall. The cold spot collection point 420 at the bottom of the cabinet should be fixed around the bottom steel plate or cable entry point 120. The cold spot collection point 430 for electrical high-risk areas should be fixed near the busbar insulator mounting base, the lower contact of the circuit breaker, or the terminal block. The collection points should be fixed with insulating fasteners to avoid affecting the safe distance from live parts. The cold spot collection point 440 on the cabinet panel should be attached to the inner surface of the cabinet panel against the wall or on the exterior wall side.

[0102] The calibration process includes initial environmental calibration, cold spot location calibration, damper operation calibration, buffer chamber 243 micro-pressure reference calibration, and dehumidification recovery calibration. Initial environmental calibration records the normal temperature and humidity range of the power distribution room; cold spot location calibration identifies the location most prone to condensation in each cabinet; damper operation calibration confirms the opening and closing times and feedback of the isolation dampers; buffer chamber 243 micro-pressure reference calibration records the stable pressure range of the buffer chamber 243 after the isolation dampers are closed; and dehumidification recovery calibration confirms the recovery time of the zone-shared dehumidification unit 300 for cabinets of different volumes.

[0103] In the preferred embodiment, on-site calibration is performed continuously for three to seven days. The control unit records the cabinet's normal temperature and humidity, minimum cold spot temperature, damper operation time, buffer chamber 243 micro-pressure baseline, dehumidification recovery time, and historical damping locations. If the power distribution room is located in a basement, coastal area, or has a history of cable trench damping, the control unit sets the cold spot observation conditions and dual-valve isolation conditions to a conservative configuration; if the power distribution room is well-ventilated and has no historical damping records, the control unit uses a standard configuration.

[0104] In an optional implementation, the control unit can communicate with the power distribution room monitoring system. The communication content includes cabinet operating status, cold spot observation records, zoned dehumidification records, dual-valve isolation records, and maintenance reminder records. This communication is used for operation and maintenance reminders and historical tracing, without altering the cabinet-to-cabinet humidity and heat relay structure and moisture-proof operation process of this application.

[0105] Example 5 illustrates the exception handling and security fallback methods of this application.

[0106] When the temperature and humidity acquisition unit 410 inside the cabinet fails, the control unit suspends dew point calculation and enters a conservative operation mode based on the temperature change trend of the cold point evidence acquisition unit 400, the status of the cable inlet moisture acquisition unit 450, and the humidity change of the buffer chamber 243. The conservative operation mode includes maintaining the local circulating fan 500 in intermittent operation, prohibiting the corresponding cabinet from participating in the relay equalization air supply, and outputting a maintenance prompt for the acquisition unit.

[0107] When the cold spot collection point 420 at the bottom of the cabinet fails, if the electrical high-risk cold spot collection point 430 and the cabinet panel cold spot collection point 440 are still available, the control unit will maintain cold spot observation based on the available collection points. If multiple cold spot collection points in the same cabinet fail, the control unit will prohibit the cabinet from being used as a candidate supply cabinet and determine whether to initiate maintenance based on the humidity inside the cabinet and the backflow status of the cable inlet 120.

[0108] When the electrical high-risk cold point collection point 430 fails, the control unit sets the dehumidification priority of the cabinet to a conservative priority and outputs a maintenance prompt for the corresponding collection point. If both the cold point collection point 420 at the bottom of the cabinet and the cold point collection point 440 on the cabinet panel are in a safe state, the control unit can maintain the cold point observation state; if any backup cold point enters the processing state, the control unit enters the zone-shared dehumidification state or the dual-valve isolation state.

[0109] When the humidity detection element 244 in the buffer chamber fails, the control unit no longer relies on the humidity of the buffer chamber 243 to confirm the isolation effect and sets the corresponding dual-valve isolation buffer chamber 240 to a conservative state. In the conservative state, the corresponding inter-cabinet humidity and heat relay unit 200 is not allowed to enter the relay temperature equalization state. If the micro-pressure detection element 245 in the buffer chamber is still usable, the control unit can determine the air leakage trend after the air valve is closed based on the micro-pressure change.

[0110] When the buffer chamber micro-pressure detection element 245 fails, the control unit judges the isolation effect based on the buffer chamber humidity detection element 244 and the feedback from the air valve position. If the buffer chamber humidity detection element 244 also fails, the control unit prohibits the inter-cabinet heat and humidity relay unit 200 from participating in relay temperature equalization and zoned shared dehumidification and air supply, and enters maintenance prompt state.

[0111] When the isolation damper is not in place, the control unit stops the equalization and zoned dehumidification connection of the corresponding cabinet heat and humidity relay unit 200 and outputs a maintenance prompt for the damper. If the damper is not in place on the side of the cabinet with abnormal moisture, the control unit will close the damper on the other side to reduce the impact of moisture diffusion.

[0112] When the bypass check valve 350 malfunctions, the control unit closes the electrically controlled air guide valve 340 on the corresponding zone air guide branch 330 and prohibits the zone-shared dehumidification unit 300 from supplying air to the cabinet. At this time, if the target cabinet still needs dehumidification, the control unit keeps the local circulation fan 500 running intermittently and outputs a maintenance prompt.

[0113] When the shared dehumidification unit 300 experiences an operational malfunction, the control unit stops the shared dehumidification and selects either cold point observation, relay temperature equalization, or maintenance prompt based on the cold point status. If multiple cabinets are simultaneously in emergency handling mode and the shared dehumidification unit 300 malfunctions, the control unit prioritizes maintaining dual-valve isolation and local circulation, and outputs a maintenance prompt.

[0114] When the filter element pressure difference is abnormal, the control unit restricts the operation of the local circulation fan 500, closes the affected zone air guide branch 330, prevents the airflow with large dust particles from entering the drying bypass cavity 230 or the zone shared dehumidification unit 300, and outputs a filter element maintenance prompt.

[0115] When the external drain check valve malfunctions, the rain cover is blocked, or the insect screen is blocked, the control unit will prevent it from entering the external drain auxiliary mode and will output a maintenance prompt for the external drain structure. If the ambient air temperature is too low, causing the cold spot temperature of the cabinet panel to drop rapidly, the control unit will exit the external drain auxiliary mode and enter the cold spot observation mode.

[0116] When communication is interrupted, the control unit maintains local control. The alarm and maintenance prompt unit can output audible and visual prompts locally. After communication is restored, the control unit uploads the status record during the interruption period to the power distribution room monitoring system.

[0117] When a fire alarm, smoke alarm, cabinet overheating, circuit breaker tripping signal, or superior fire alarm signal is detected, the control unit closes the corresponding isolation damper of the relevant cabinet, stops relay temperature equalization, zone-shared dehumidification, and external exhaust auxiliary operations, and enters a dual-valve isolation state or maintenance prompt state. This state does not automatically recover until the fire alarm signal is released.

[0118] Through the above embodiments, this application can establish an inter-cabinet airflow structure with relay, bypass, and isolation functions in a row of distribution cabinets. It utilizes the warm airflow between adjacent cabinets to reduce the risk of condensation at localized cold spots and reduces the energy consumption of independent dehumidification in each cabinet by using a zoned shared dehumidification unit 300. When a cabinet experiences backflow of moisture at the cable inlet 120, cabinet door opening, actuator malfunction, or fire alarm signal, the dual-valve isolation buffer chamber 240 can block and verify the diffusion of moisture or smoke, ensuring that adjacent cabinets maintain relatively independent moisture-proof operation.

[0119] It should be noted that, for the sake of brevity, the foregoing method embodiments are described as a series of actions, but this does not mean that the application limits the order of the steps. Based on the ideas of this application, some steps can be executed in different orders or in parallel without affecting the functional implementation. Secondly, those skilled in the art should also understand that the specific embodiments described in the specification are preferred embodiments of the technical solutions of this application, and not limitations on the scope of protection of this application. All equivalent improvements or substitutions made within the spirit and principles of this application should be covered within the scope of protection of this application.

[0120] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart moisture-proof power saving switchgear bank characterized in that, It includes multiple power distribution cabinets arranged in parallel, a cabinet-to-cabinet humidity and heat relay unit located between two adjacent power distribution cabinets, a zone-shared dehumidification unit connected to the cabinet-to-cabinet humidity and heat relay unit, a cold point evidence collection unit located in the power distribution cabinet, a cable inlet moisture collection unit, a cabinet door status collection device, a local circulating fan, and a control unit. The cabinet-to-cabinet humidity and heat relay unit includes a relay temperature equalization chamber, a drying bypass chamber, and a dual-valve isolation buffer chamber. The dual-valve isolation buffer chamber includes two isolation air valves, a buffer chamber located between the two isolation air valves, a buffer chamber humidity detection device, and a buffer chamber micro-pressure detection device disposed in the buffer chamber. The control unit is used to determine the cabinet temperature uniformity condition, zoned dehumidification condition, or dual-valve isolation condition based on the collection results of the cold point evidence collection unit and the collection results of the cable inlet moisture collection unit. The control unit is also used to control the local circulating fan to make the airflow flow through the relay temperature equalization chamber between two adjacent power distribution cabinets according to the determined conditions, or to control the zone-shared dehumidification unit to send dry air to the power distribution cabinet that needs to be supplied with dry air through the drying bypass chamber, or to control the two isolation air valves to close to cut off the inter-cabinet communication between the corresponding power distribution cabinet and the adjacent power distribution cabinet.

2. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 1, characterized in that, The control unit determines the cabinet temperature uniformity conditions, zoned dehumidification conditions, or dual-valve isolation conditions based on the data collected by the cold point evidence collection unit and the cable inlet moisture return collection unit, including: The unit acquires the cabinet air temperature, cabinet relative humidity, cabinet bottom cold point temperature, electrical high-risk cold point temperature, and cabinet panel cold point temperature collected by the cold point evidence acquisition unit, and acquires the cable inlet moisture status collected by the cable inlet moisture acquisition unit. The dew point temperature of the air inside the cabinet is determined based on the air temperature inside the cabinet and the relative humidity inside the cabinet. The cold point temperature at the bottom of the cabinet, the cold point temperature at the electrical high-risk point, and the cold point temperature at the cabinet panel are compared with the dew point temperature of the air inside the cabinet to obtain the dew point safety margin for the corresponding cold point. The corresponding cold point is determined to be in a safe state, an observation state, a processing state, or an emergency processing state based on the dew point safety margin.

3. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 2, characterized in that, The control unit determines the temperature uniformity conditions between cabinets, including: The distribution cabinets whose cold spots are in a safe state and whose cable inlet moisture conditions are not met are identified as candidate supply cabinets. The distribution cabinets that are under observation or processing are identified as candidate support cabinets. If the air temperature inside the candidate supply cabinet is higher than the air temperature inside the candidate rescue cabinet, and the doors of both the candidate supply cabinet and the candidate rescue cabinet are closed, the feedback and control status of the two isolation air valves are consistent, the humidity of the buffer chamber does not meet the condition of continuous increase, and the fire linkage status is not established, then the condition of uniform temperature between cabinets is determined to be established. When the temperature equalization condition between the cabinets is met, the local circulating fan is controlled to guide the warm airflow in the candidate supply cabinet through the relay temperature equalization chamber into the candidate aid cabinet.

4. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 3, characterized in that, The control unit determines the zoned dehumidification conditions, including: When the cold spot of the power distribution cabinet is in a processing or emergency processing state, and the temperature uniformity between the cabinets is not met, the power distribution cabinet is identified as a candidate cabinet for zoned dehumidification. In the case of multiple candidate cabinets for zoned dehumidification, the cabinets with electrical high-risk cold points that are in emergency handling status shall be given priority as the cabinets that need to be supplied with dry air. When there are no electrical high-risk cold spots in the emergency handling state of the distribution cabinet, the distribution cabinet with the cold spot at the bottom of the cabinet in the emergency handling state is identified as the distribution cabinet that needs to be supplied with dry air. When multiple power distribution cabinets are at the same priority, the power distribution cabinets that need to be supplied with dry air are determined based on the duration of the risk, the number of historical back damping events, and the availability of the air supply path between the partitioned shared dehumidification unit and the drying bypass cavity. The control unit controls the shared dehumidification unit to supply dry air to the power distribution cabinet that needs to be supplied with dry air through the drying bypass cavity.

5. A smart moisture-proof energy-saving power distribution cabinet according to any one of claims 1 to 4, characterized in that, The control unit determines the dual-valve isolation conditions, including: The dual-valve isolation condition is determined to be met if the cabinet door remains open for more than the confirmation time, the cable inlet dampness condition is established, the cable inlet dampness acquisition unit outputs a bottom water accumulation signal, the humidity in the buffer chamber continues to rise, the micro-pressure in the buffer chamber is abnormal, either of the two isolation valves is not in position, any key acquisition result of the cold point evidence acquisition unit fails, the cable inlet dampness acquisition unit fails, the humidity detection device in the buffer chamber fails, the micro-pressure detection device in the buffer chamber fails, the cabinet is overheated, there is a smoke signal, a circuit breaker trip signal, or the fire alarm linkage status is established. When the dual-valve isolation condition is met, the two isolation air valves are controlled to close, and the corresponding power distribution cabinet is prohibited from participating in the relay equalization and regular zone shared dehumidification and air supply.

6. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 1, characterized in that, The inter-cabinet damp heat relay unit includes a relay housing, which is disposed between two adjacent distribution cabinets; The relay temperature equalization chamber, the drying bypass chamber, and the dual-valve isolation buffer chamber are arranged in parallel within the relay housing and each forms an independent airflow path; The two ends of the relay temperature equalization cavity are respectively connected to the interior of the two adjacent power distribution cabinets; The drying bypass cavity is connected to the partition-shared dehumidification unit and to the interior of the power distribution cabinet that needs to be supplied with dry air.

7. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 6, characterized in that, The two isolation valves include a first isolation valve and a second isolation valve; The first isolation air valve is located near one side of the two adjacent power distribution cabinets, and the second isolation air valve is located near the other side of the two adjacent power distribution cabinets. The buffer chamber is located between the first isolation air valve and the second isolation air valve. The humidity detection device and the micro-pressure detection device of the buffer chamber are used to provide feedback on the isolation effect to the control unit. The buffer chamber is equipped with a pressure-limiting micro-venting component and a condensate diversion channel.

8. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 6, characterized in that, The zoned shared dehumidification unit includes a dehumidification module, a dry air distribution manifold, and multiple zoned air guide branches; The dry air distribution manifold is connected to the dehumidification module, and the multiple zoned air guide branches are respectively connected to the dry air distribution manifold; Each of the partitioned air guide branches is connected to the corresponding drying bypass cavity, and each of the partitioned air guide branches is equipped with an electrically controlled air guide valve and a bypass check valve; The control unit is used to control the opening and closing of the electrically controlled air guide valve to select and send dry air to the corresponding drying bypass cavity of the power distribution cabinet that needs to be supplied with dry air. The bypass check valve is used to restrict the reverse flow of humid air inside the distribution cabinet to the partitioned air duct.

9. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 1, characterized in that, It also includes an external exhaust auxiliary unit and an external air temperature and humidity sensor; The external exhaust auxiliary unit includes an external exhaust vent, an external exhaust check valve, a rain cover, an insect screen, and an external exhaust filter. The ambient air temperature and humidity sensor is used to collect ambient air temperature and ambient relative humidity. The control unit is used to determine the dew point of the air inside the cabinet based on the collection results of the cold point evidence collection unit, and to determine the dew point of the outside air based on the collection results of the outside air temperature and humidity collection device. When the outside air dew point is lower than the inside air dew point, the cabinet door is closed, the cable inlet dampness condition is not established, the feedback and control status of the external discharge check valve are consistent, and the rain cover, the insect net, and the external discharge filter are not blocked, the external discharge auxiliary unit is controlled to discharge the humid air inside the corresponding power distribution cabinet.

10. The intelligent moisture-proof energy-saving power distribution cabinet group according to claim 1, characterized in that, It also includes an alarm and maintenance notification unit; The control unit is also used to acquire feedback results from the cabinet door status acquisition device, the buffer chamber humidity detection device, the buffer chamber micro-pressure detection device, the zoned shared dehumidification unit, and the local circulating fan; Based on the feedback results, the control unit switches the intelligent moisture-proof energy-saving power distribution cabinet group between low-power standby state, cold spot observation state, relay temperature equalization state, zoned shared dehumidification state, dual-valve isolation state, or maintenance reminder state. When the intelligent moisture-proof energy-saving distribution cabinet group enters the maintenance reminder state, the control unit controls the alarm and maintenance reminder unit to output a maintenance reminder, and controls the corresponding distribution cabinet not to participate in the relay equalization and regular zone shared dehumidification and air supply.

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