A switch cabinet microcirculation dehumidification system with double humidity thresholds and a control method thereof

Abstract

The present application relates to the technical fields of switch cabinet microcirculation, and discloses a double-humidity-threshold switch cabinet microcirculation dehumidification system and control method, the system comprises a microcirculation system and a bolt integrated micro-humidity sensor system, the microcirculation system comprises a fan, a microcirculation control unit, and an indoor humidity sensor for monitoring the indoor environment humidity of the switch cabinet; the method comprises the following steps: step S1, system power-on, sensor self-checking and communication link self-checking; step S2, real-time monitoring and acquiring the values of indoor humidity H and cabinet humidity Hc; step S3, comparing H, Hc with threshold values S1, S2 and S3. The present application constructs an active dehumidification mechanism for the closed space inside the switch cabinet, the system introduces external dry air using the existing structure of the cabinet door, and forms forced convection in the cabinet, realizing targeted management of the problem of humid accumulation in the cabinet.

Description

Technical Field

[0001] This invention relates to the field of micro-circulation technology for switchgear, specifically to a micro-circulation dehumidification system and control method for switchgear with dual humidity thresholds. Background Technology

[0002] In power distribution systems, 10kV switchgear is a critical piece of electrical equipment, and the humidity control of its internal microenvironment directly affects the equipment's insulation performance and operational reliability. Due to its enclosed structure and poor internal air circulation, switchgear is prone to moisture accumulation in humid environments, leading to increased humidity inside the cabinet. Prolonged exposure to damp conditions can cause serious malfunctions such as insulation material aging, partial discharge, equipment short circuits, and even fires, threatening the safe and stable operation of the power grid.

[0003] Currently, common dehumidification measures mainly rely on dehumidifiers or air conditioning systems installed in power distribution rooms. These devices can only regulate the humidity of the overall indoor environment and cannot effectively act on the enclosed space inside the switchgear. Moisture inside the cabinet is difficult to expel, forming a humidity dead zone, resulting in persistently high local humidity. In addition, existing technologies lack real-time monitoring methods for the microenvironment inside the cabinet. Dehumidification devices often rely on a single environmental humidity parameter for start-stop control and cannot be dynamically adjusted according to the actual humidity state inside the cabinet. This poses a risk of untimely dehumidification or excessive introduction of external humid air. Based on this, the present invention designs a switchgear micro-circulation dehumidification system and control method with dual humidity thresholds to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a micro-circulation dehumidification system and control method for switch cabinets with dual humidity thresholds, which solves the problems of local humidity dead zones and untimely monitoring in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A micro-circulation dehumidification system for switchgear with dual humidity thresholds includes a micro-circulation system and a bolt-integrated micro humidity sensing system.

[0006] The micro-circulation system includes a fan, a micro-circulation control unit, and an indoor humidity sensor for monitoring the indoor humidity of the switch cabinet. The fan's air inlet is connected to an air inlet nozzle, which is configured to fit the existing screw holes on the switch cabinet door, thereby introducing indoor air into the cabinet to form forced convection.

[0007] The integrated micro humidity sensing system includes an integrated structure that is interchangeable with the fixing bolts of the switch cabinet door. The integrated structure includes a sensor probe for detecting the humidity inside the cabinet. The integrated structure also includes a microprocessor and a communication module for real-time online monitoring and data transmission of the humidity inside the cabinet.

[0008] The control unit is configured to simultaneously receive the indoor humidity H collected by the indoor humidity sensor and the cabinet humidity Hc collected by the bolt-integrated miniature humidity sensor, and execute the following linkage control logic.

[0009] The fan will start operating when the startup conditions H≤75%RH and Hc>65%RH are met. When the stop condition Hc≤55%RH is met, the fan is shut down and stops operating; Where H represents the relative humidity of the room where the switchgear is located, and Hc represents the relative humidity inside the switchgear.

[0010] Preferably, the microcirculation system has two energy supply modes: a long-term deployment mode, which uses an external power source; and a mobile deployment mode, which uses a built-in battery, and the built-in battery can work continuously for more than 30 days after a single charge.

[0011] Preferably, the dimensions of the integrated structure are designed to be interchangeable with standard cabinet door bolts; the sensor probe and signal processing circuit are encapsulated within the hollow structure of the bolt, and the outer shell is made of corrosion-resistant metal material, with a PTFE hydrophobic and breathable membrane covering the sensing area.

[0012] Preferably, the integrated bolt micro humidity sensor has a humidity detection range of 0-100%RH and is powered by a battery and energy harvesting method; the energy harvesting method is to harvest piezoelectric energy using the vibration energy of the cabinet door and generate electricity using the temperature difference between the inside and outside of the cabinet.

[0013] Preferably, the system further includes a local data logger for cyclically storing historical H and Hc data, device start-up and shutdown events, and alarm records; the bolt-integrated miniature humidity sensor and the control unit of the micro-circulation device transmit data via Bluetooth Low Energy wireless communication and adopt a custom communication protocol, which includes data encryption and verification mechanisms.

[0014] Preferably, the fan is an axial brushless fan, and under simulated switchgear environmental conditions, the air intake flow rate of the micro-circulation device is 1-5 m³ / h. 3 / h, which can make the air exchange rate inside the cabinet ≥0.5 times / hour.

[0015] A control method for a micro-circulation dehumidification system for a switchgear with dual humidity thresholds includes the following steps: Step S1: Power on the system and perform sensor self-test and communication link self-test.

[0016] Step S2: Monitor and obtain the values ​​of indoor humidity H and cabinet humidity Hc in real time.

[0017] Step S3: Compare H and Hc with thresholds S1, S2, and S3.

[0018] Step S4: If the fan start-up conditions are met, start the fan to dehumidify and record the start-up event; if the fan stop-down conditions are met, turn off the fan to stop dehumidification and record the stop-down event.

[0019] Step S5: If H > S1 occurs during fan operation, the fan will be forcibly shut down immediately, and a risk alarm record for introducing humid air will be generated.

[0020] Preferably, the control logic of the method is defined by the following formulaic conditions: Fan start-up conditions: H≤S1 and Hc>S2; Fan shutdown condition: Hc≤S3; Wherein, S1 is the indoor humidity safety threshold, set to 75%RH; S2 is the cabinet humidity start threshold, set to 65%RH; S3 is the cabinet humidity stop threshold, set to 55%RH; H is the real-time indoor relative humidity, and Hc is the real-time cabinet relative humidity.

[0021] Preferably, the method further includes a threshold adaptation step, wherein the control unit analyzes the variation pattern of humidity in the cabinet under typical seasons and weather conditions based on historical humidity data stored in the local data logger, and dynamically fine-tunes the thresholds of S2 and S3 through a preset algorithm.

[0022] Preferably, the method includes a system self-diagnosis step, wherein the control unit periodically monitors the fan current before each startup to determine whether there is an abnormality, and monitors whether the sensor data is continuously out of range and communication timeout. When a fault is diagnosed, a specific alarm signal is issued through the system status indicator, and the fault information is recorded in the local data logger.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. This invention constructs an active dehumidification mechanism for the enclosed space inside a switch cabinet by working in synergy between a micro-circulation system and a bolt-integrated micro humidity sensing system. The system utilizes the existing structure of the cabinet door to introduce dry external air and forms forced convection inside the cabinet, thereby directly eliminating the "humidity dead zone" inside the cabinet, achieving targeted treatment of the problem of moisture accumulation inside the cabinet, and improving dehumidification efficiency.

[0024] 2. This invention, by introducing a bolt-integrated miniature humidity sensor, achieves real-time and accurate online monitoring of the humidity of the microenvironment inside the switch cabinet. The system makes a dual-parameter linkage judgment based on the actual humidity state inside the cabinet and the ambient humidity, overcoming the limitations of existing technologies that rely on a single environmental parameter. This makes the start-stop control of the dehumidification device more scientific and reasonable, avoiding both untimely dehumidification and the risk of blindly starting the device when the outdoor environment is humid, thus introducing more moisture.

[0025] 3. This invention constructs a safe and reliable intelligent dehumidification closed loop. The system only starts when it is confirmed that the external air is dry and the cabinet needs dehumidification, and stops in time after the humidity in the cabinet reaches the standard, thus achieving precise control and energy-saving operation. In addition, the system's threshold adaptive function can dynamically optimize control parameters based on historical operating data, enabling the system to flexibly adapt to climate changes in different seasons and regions and maintain long-term effectiveness. Attached Figure Description

[0026] Fig. 1 This is a system composition block diagram of the present invention; Fig. 2 This is a flowchart of the threshold adaptive process of the present invention; Fig. 3 This is a flowchart of the system self-diagnosis of the present invention. Detailed Implementation

[0027] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figs. 1-3 In this embodiment of the invention, a switch cabinet micro-circulation dehumidification system with dual humidity thresholds includes a micro-circulation system and a bolt-integrated micro humidity sensing system.

[0029] The micro-circulation system includes a fan, a micro-circulation control unit, and an indoor humidity sensor for monitoring the indoor humidity of the switch cabinet. The fan's air inlet is connected to an air inlet nozzle, which is configured to fit the existing screw holes on the switch cabinet door, thereby introducing indoor air into the cabinet to form forced convection.

[0030] The integrated micro humidity sensing system includes an integrated structure designed to be interchangeable with the fixing bolts of the switch cabinet door. The integrated structure includes a sensor probe for detecting humidity inside the cabinet, as well as a microprocessor and communication module for real-time online monitoring and data transmission of humidity inside the cabinet.

[0031] The control unit is configured to simultaneously receive the indoor humidity H collected by the indoor humidity sensor and the cabinet humidity Hc collected by the bolt-integrated miniature humidity sensor, and execute the following linkage control logic: When the startup conditions H≤75%RH and Hc>65%RH are met, the fan will start operating. When the stop condition Hc≤55%RH is met, the fan is shut down and operation is stopped. Where H represents the relative humidity of the room where the switchgear is located, and Hc represents the relative humidity inside the switchgear.

[0032] The microcirculation system has two energy supply modes: a long-term deployment mode, which uses an external power source; and a mobile deployment mode, which uses an internal battery, and the internal battery can work continuously for more than 30 days after a single charge.

[0033] The integrated structure is designed to be interchangeable with standard cabinet door bolts; the sensor probe and signal processing circuit are encapsulated in the hollow structure of the bolt, and the outer shell is made of corrosion-resistant metal material, with a PTFE hydrophobic and breathable membrane covering the sensing area.

[0034] The integrated bolt-mounted miniature humidity sensor has a humidity detection range of 0-100%RH and is powered by a battery and energy harvesting method. The energy harvesting method is to harvest piezoelectric energy using the vibration energy of the cabinet door and generate electricity using the temperature difference between the inside and outside of the cabinet.

[0035] The system also includes a local data logger for cyclically storing historical H and Hc data, device start-up and shutdown events, and alarm records; the bolt-integrated miniature humidity sensor transmits data with the control unit of the micro-circulation device via Bluetooth Low Energy wireless communication, using a custom communication protocol that includes data encryption and verification mechanisms.

[0036] The fan is an axial brushless fan. Under simulated switchgear environmental conditions, the intake airflow of the micro-circulation device is 1-5 m³ / h. 3 / h, which can make the air exchange rate inside the cabinet ≥0.5 times / hour.

[0037] The working principle of this invention is as follows: After the system is powered on, the control unit initializes and establishes communication connections with both the indoor humidity sensor and the bolt-integrated miniature humidity sensing system. The bolt-integrated miniature humidity sensing system, with its integrated structural design, can directly replace the standard fixing bolts on the switch cabinet door, achieving non-intrusive installation. Its internal sensor probe monitors the relative humidity Hc inside the switch cabinet in real time and wirelessly transmits the data to the control unit via an integrated communication module. Simultaneously, the indoor humidity sensor installed in the room where the switch cabinet is located continuously monitors the ambient relative humidity H.

[0038] The control unit makes decisions based on a dual humidity threshold linkage control logic, continuously comparing the received indoor humidity (H) with the cabinet humidity (Hc). The control unit activates the axial brushless fan in the micro-circulation system only when both activation conditions are met simultaneously: the indoor environment is relatively dry (H≤75%RH) and the cabinet humidity is relatively high (Hc>65%RH). During fan operation, dry outdoor air is introduced into the cabinet through air inlets adapted to the existing screw holes on the cabinet door, creating directional forced convection from the air inlet to other areas of the cabinet. This convection effectively displaces and expels moisture accumulated inside the cabinet, thus achieving active dehumidification and preventing the formation of "humidity dead zones."

[0039] During dehumidification, the system continuously monitors the humidity. Once the shutdown condition is met—that is, when the humidity Hc inside the cabinet drops to a safe level (Hc≤55%RH)—the control unit shuts down the fan, stopping dehumidification to save energy. Furthermore, as a safety redundancy, if the indoor humidity H suddenly rises and exceeds the safe threshold (H>75%RH) during fan operation, the control unit will immediately force the fan to shut down and generate an alarm record to prevent the introduction of humid outside air into the cabinet.

[0040] The system features a flexible energy supply mode, allowing for either long-term external power supply or mobile deployment with built-in batteries, depending on the deployment scenario. The bolt-integrated miniature humidity sensor can be powered by a combination of batteries and energy harvesting, ensuring the reliability of long-term monitoring.

[0041] Example 2; Please see Figs. 1-3 In this embodiment of the invention, a control method for a switch cabinet micro-circulation dehumidification system with dual humidity thresholds includes the following steps: Step S1: Power on the system and perform sensor self-test and communication link self-test.

[0042] Step S2: Monitor and obtain the values ​​of indoor humidity H and cabinet humidity Hc in real time.

[0043] Step S3: Compare H and Hc with thresholds S1, S2, and S3.

[0044] Step S4: If the fan start-up conditions are met, start the fan to dehumidify and record the start-up event; if the fan stop-down conditions are met, turn off the fan to stop dehumidification and record the stop-down event.

[0045] Step S5: If H > S1 occurs during fan operation, the fan will be forcibly shut down immediately, and a risk alarm record for introducing humid air will be generated.

[0046] The control logic of the method is defined by the following formulaic conditions: Fan start-up conditions: H≤S1 and Hc>S2; Fan shutdown condition: Hc≤S3; Wherein, S1 is the indoor humidity safety threshold, set to 75%RH; S2 is the cabinet humidity start threshold, set to 65%RH; S3 is the cabinet humidity stop threshold, set to 55%RH; H is the real-time indoor relative humidity, and Hc is the real-time cabinet relative humidity.

[0047] The method also includes a threshold adaptation step, in which the control unit analyzes the variation pattern of humidity in the cabinet under typical seasons and weather conditions based on historical humidity data stored in the local data logger, and dynamically fine-tunes the thresholds of S2 and S3 through a preset algorithm.

[0048] The method includes a system self-diagnostic procedure. Before each startup, the control unit periodically monitors the fan current to determine if there is any abnormality, and monitors whether the sensor data is continuously out of range and communication timeout. When a fault is diagnosed, a specific alarm signal is issued through the system status indicator, and the fault information is recorded in the local data logger.

[0049] The working principle of this invention embodiment is as follows: First, the system power-on and self-test steps (S1) are executed. After the system is powered on, the control unit automatically performs sensor self-test and communication link self-test to check whether the indoor humidity sensor and the bolt-integrated miniature humidity sensor are working properly, and whether the wireless communication link is unobstructed, so as to ensure the reliability of data acquisition and transmission.

[0050] Next, the system proceeds to the real-time monitoring and data acquisition step (S2), where it continuously and synchronously collects the ambient relative humidity H of the room where the switch cabinet is located, as well as the relative humidity Hc inside the cabinet measured by the bolt-integrated miniature humidity sensor.

[0051] Subsequently, a humidity threshold comparison step (S3) is performed. The control unit logically compares the real-time acquired H and Hc values ​​with the preset thresholds S1 (indoor humidity safety threshold, 75%RH), S2 (cabinet humidity start threshold, 65%RH), and S3 (cabinet humidity stop threshold, 55%RH).

[0052] Based on the comparison results, the fan linkage control step (S4) is executed. If the formulaic fan start condition (H≤S1 and Hc>S2) is met, the control unit starts the fan for dehumidification and records this start event in the local data logger. During the dehumidification process, if the fan stop condition (Hc≤S3) is met, the control unit shuts down the fan, stops dehumidification, and records the stop event.

[0053] Simultaneously, the system executes the operational safety monitoring step (S5), continuously monitoring the indoor humidity H during fan operation. If H > S1 is detected, the fan is immediately and forcibly shut down to interrupt any risky operation that may introduce humid air, and a corresponding risk alarm record is generated.

[0054] Furthermore, the method includes a threshold adaptation step. The control unit can analyze the variation pattern of humidity inside the cabinet under different seasons and weather conditions based on historical humidity data stored in the local data logger, and dynamically fine-tune the thresholds of S2 and S3 through a preset algorithm to make the control strategy more environmentally adaptable; and a system self-diagnosis step, in which the control unit periodically monitors the operating current of the fan before it starts to determine whether there is any abnormality, and monitors whether the sensor data is continuously out of range and communication timeout. When a fault is diagnosed, a specific alarm signal is issued through the system status indicator and the fault information is recorded, which improves the maintainability and operational reliability of the system.

[0055] Example 3; Please see Figs. 1-3 This paper provides a specific embodiment of a micro-circulation dehumidification system and control method for switchgear with dual humidity thresholds. The system is designed for KYN28 type 10kV switchgear. Its core is to achieve precise and efficient dehumidification of the microenvironment inside the cabinet through dual humidity threshold linkage control.

[0056] The system comprises a micro-circulation system and a bolt-integrated miniature humidity sensing system. The core component of the micro-circulation system is an axial-flow brushless fan with a rated power not exceeding 1W. Its air inlet is connected to a specially designed air inlet nozzle, whose mechanical dimensions are adapted to fit the existing M12 standard screw holes on the KYN28 cabinet door. Under simulated switchgear environmental conditions, the fan's airflow rate is set to 1m³ / min. 3 / h to 5m 3 Between / h, this flow rate ensures that the air exchange rate inside the cabinet is not less than 0.5 times / hour.

[0057] The integrated bolt-mounted miniature humidity sensing system features a single, integrated structure. Its shape and mechanical strength are completely interchangeable with standard M12 cabinet door fixing bolts, with a tensile strength of no less than 400 MPa. The sensor probe and signal processing circuitry are encapsulated within the hollow structure of the bolt. The outer shell is made of corrosion-resistant metal, and the sensing area is covered with a PTFE hydrophobic and breathable membrane. The sensor's humidity detection range is 0%RH to 100%RH, with a detection accuracy error not exceeding ±2%RH and a response time of no more than 8 seconds. It is powered by a built-in battery combined with energy harvesting, and its designed service life is no less than 5 years.

[0058] The system's control unit simultaneously receives indoor humidity (H) from an indoor humidity sensor and cabinet humidity (Hc) from a bolt-integrated miniature humidity sensor. The control logic is strictly defined by the following formulaic conditions: the fan starts when indoor humidity (H) ≤ 75%RH and cabinet humidity (Hc) > 65%RH; the fan stops when cabinet humidity (Hc) ≤ 55%RH.

[0059] The control method is executed according to the following procedure: After the system is powered on, the control unit automatically performs a self-test of the sensors and communication links. The system then enters a real-time monitoring state, continuously acquiring indoor and cabinet humidity values. When the start-up conditions are met, such as an indoor humidity of 70%RH and a cabinet humidity of 68%RH, the control unit starts the axial brushless fan within 30 seconds. The fan introduces dry outdoor air into the cabinet, creating forced convection to expel moisture. When the cabinet humidity Hc drops to 54%RH, meeting the stop conditions, the control unit shuts down the fan. If the indoor ambient humidity Hc suddenly rises to 78%RH during operation, exceeding the safety threshold of 75%RH, the control unit will immediately forcefully shut down the fan and generate an alarm record.

[0060] In addition, the system has a threshold adaptive function. Based on historical data, the control unit can fine-tune the humidity start threshold S2 in the cabinet from 65% to 63% and the stop threshold S3 from 55% to 53% using a preset algorithm to adapt to different seasonal environments.

[0061] Working Principle: Upon system startup, the control unit first performs an initialization self-test to ensure the sensors and communication link are functioning correctly. Subsequently, the system enters continuous monitoring mode. The bolt-integrated miniature humidity sensor, with its unique integrated structure interchangeable with the cabinet door fixing bolts, monitors the relative humidity Hc inside the cabinet in real time and accurately without compromising the cabinet's airtightness, and transmits the data to the control unit wirelessly. Simultaneously, an ambient humidity sensor installed in the room where the switch cabinet is located monitors the ambient relative humidity H.

[0062] The control unit's logic is defined by explicit, formulaic conditions: the system determines that it has the necessary conditions for safe and effective dehumidification only when both "dry indoor environment (H≤75%RH)" and "high humidity inside the cabinet (Hc>65%RH)" are simultaneously met. It then activates the axial brushless fan in the micro-circulation system. The fan draws dry outdoor air into the cabinet through an air inlet that fits the existing screw holes on the cabinet door, creating forced convection. This effectively displaces and removes accumulated moisture inside the cabinet, achieving active dehumidification.

[0063] During dehumidification, the system continuously tracks the humidity (Hc) inside the cabinet. Once Hc drops to the target safe value (Hc≤55%RH), indicating that dehumidification has been achieved, the control unit issues a command to shut down the fan, and the system stops operating, thus achieving energy savings. Crucially, the system continuously monitors the indoor ambient humidity (H) throughout the entire fan operation. If H rises and exceeds the safe threshold of 75%RH, the control unit will immediately execute a forced shutdown and generate an alarm record. This safety mechanism eliminates the risk of introducing humid external air into the cabinet, ensuring equipment safety.

[0064] In addition, the system integrates advanced threshold adaptation and system self-diagnosis functions. The control unit can dynamically fine-tune the start and stop thresholds of humidity in the cabinet based on locally stored historical data, enabling the system to adapt to changes in different seasons and weather conditions. At the same time, the regular self-diagnosis program can monitor the status of the fan and the health of the sensors, and promptly issue alarms when abnormalities are detected, which greatly improves the intelligence level and operational reliability of the system.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A micro-circulation dehumidification system for switchgear with dual humidity thresholds, characterized in that, This includes a micro-circulation system and a bolt-integrated micro humidity sensing system; The micro-circulation system includes a fan, a micro-circulation control unit, and an indoor humidity sensor for monitoring the indoor humidity of the switch cabinet; the air inlet of the fan is connected to an air inlet nozzle, which is configured to fit the existing screw holes on the switch cabinet door, thereby introducing indoor air into the cabinet to form forced convection. The integrated micro humidity sensing system includes an integrated structure that is interchangeable with the fixing bolts of the switch cabinet door. The integrated structure includes a sensor probe for detecting the humidity inside the cabinet. The integrated structure also includes a microprocessor and a communication module for real-time online monitoring and data transmission of the humidity inside the cabinet. The control unit is configured to simultaneously receive the indoor humidity H collected by the indoor humidity sensor and the cabinet humidity Hc collected by the bolt-integrated miniature humidity sensor, and execute the following linkage control logic: The fan will start operating when the startup conditions H≤75%RH and Hc>65%RH are met. When the stop condition Hc≤55%RH is met, the fan is shut down and stops operating; Where H represents the relative humidity of the room where the switchgear is located, and Hc represents the relative humidity inside the switchgear.

2. The micro-circulation dehumidification system for switchgear with dual humidity thresholds according to claim 1, characterized in that, The microcirculation system has two energy supply modes: a long-term deployment mode, which uses an external power source; and a mobile deployment mode, which uses a built-in battery, and the built-in battery can work continuously for more than 30 days after a single charge.

3. The micro-circulation dehumidification system for switchgear with dual humidity thresholds according to claim 1, characterized in that: The dimensions of the integrated structure are designed to be interchangeable with standard cabinet door bolts; the sensor probe and signal processing circuit are encapsulated in the hollow structure of the bolt, and the outer shell is made of corrosion-resistant metal material, and the sensing area is covered with a PTFE hydrophobic and breathable membrane.

4. The micro-circulation dehumidification system for switchgear with dual humidity thresholds according to claim 1, characterized in that: The integrated bolt-mounted miniature humidity sensor has a humidity detection range of 0-100%RH and is powered by a battery and energy harvesting method. The energy harvesting method is to harvest piezoelectric energy using the vibration energy of the cabinet door and generate electricity using the temperature difference between the inside and outside of the cabinet.

5. The micro-circulation dehumidification system for switchgear with dual humidity thresholds according to claim 1, characterized in that: The system also includes a local data logger for cyclically storing historical H and Hc data, device start-up and shutdown events, and alarm records. The bolt-integrated miniature humidity sensor transmits data with the control unit of the micro-circulation device via Bluetooth Low Energy wireless communication and adopts a custom communication protocol, which includes data encryption and verification mechanisms.

6. The micro-circulation dehumidification system for switchgear with dual humidity thresholds according to claim 1, characterized in that: The fan is an axial brushless fan, and under simulated switchgear environmental conditions, the air intake flow rate of the micro-circulation device is 1-5 m³ / h. 3 / h, which can make the air exchange rate inside the cabinet ≥0.5 times / hour.

7. A control method for a micro-circulation dehumidification system for switchgear with dual humidity thresholds, implemented using the micro-circulation dehumidification system for switchgear with dual humidity thresholds as described in any one of claims 1-6, characterized in that, Includes the following steps: Step S1: Power on the system and perform sensor self-test and communication link self-test; Step S2: Monitor and obtain the values ​​of indoor humidity H and cabinet humidity Hc in real time; Step S3: Compare H and Hc with thresholds S1, S2, and S3. Step S4: If the fan start-up conditions are met, start the fan to dehumidify and record the start-up event; if the fan stop-down conditions are met, turn off the fan to stop dehumidification and record the stop-down event. Step S5: If H > S1 occurs during fan operation, the fan will be forcibly shut down immediately, and a risk alarm record for introducing humid air will be generated.

8. The control method for a micro-circulation dehumidification system for a switchgear with dual humidity thresholds according to claim 7, characterized in that, The control logic of the method is defined by the following formulaic conditions: Fan start-up conditions: H≤S1 and Hc>S2; Fan shutdown condition: Hc≤S3; Wherein, S1 is the indoor humidity safety threshold, set to 75%RH; S2 is the cabinet humidity start threshold, set to 65%RH; S3 is the cabinet humidity stop threshold, set to 55%RH; H is the real-time indoor relative humidity, and Hc is the real-time cabinet relative humidity.

9. The control method for a switchgear micro-circulation dehumidification system with dual humidity thresholds according to claim 7, characterized in that: The method also includes a threshold adaptation step, in which the control unit analyzes the variation pattern of humidity in the cabinet under typical seasons and weather conditions based on historical humidity data stored in the local data logger, and dynamically fine-tunes the thresholds of S2 and S3 through a preset algorithm.

10. The control method for a dual humidity threshold micro-circulation dehumidification system for switchgear according to claim 7, characterized in that: The method includes a system self-diagnosis step. Before each startup, the control unit periodically monitors the fan current to determine if there is any abnormality, and monitors whether the sensor data is continuously out of range and communication timeout. When a fault is diagnosed, a specific alarm signal is issued through the system status indicator, and the fault information is recorded in the local data logger.

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