Bus drying system in switch cabinet groove

Abstract

The invention discloses a switch cabinet in-groove bus drying system, which relates to the field of drying and comprises a switch cabinet, an insulating part, a drying device, an acquisition control unit, a power-off device and a single chip microcomputer, a bottom side plate of the switch cabinet is provided with an acquisition control unit. The acquisition control unit comprises a temperature sensor, a humidity sensor and a wind speed measuring device. The drying device comprises an air inlet device and an air outlet device; the drying device further comprises an incandescent lamp; the power-off device is connected with the drying device; the single chip microcomputer is used for controlling the drying device, the acquisition control unit and the power-off device; the single-chip microcomputer is electrically connected with the acquisition control unit, the drying device and the power-off device. The switch cabinet is mainly used for solving the problem that switch cabinets in southern areas are easily affected with damp, and the safe and stable operation level of a power grid is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of drying, and more specifically to a busbar drying system in a switch cabinet slot. Background Art

[0002] With the continuous increase in electricity consumption, the number of substations is increasing, and the number of switch cabinets is bound to grow geometrically. However, in the warm southern region, especially in the rainy season, moisture is pervasive and hard to prevent. In the long run, the insulating parts of the bus duct in the switch cabinet will gradually absorb moisture, causing the insulation level to drop, thereby generating partial discharge, which may cause power outages for maintenance, or even unplanned power outages, seriously affecting the safe and stable operation of the power grid. Without a set of targeted and dedicated switch cabinet moisture-proof drying devices, the large number of switch cabinets will become "time bombs", which will increase the workload of maintenance and repair, and may also cause line tripping, affecting the safe and stable operation of the power grid. At present, there are two ways to deal with the dampness of insulating parts: 1. Remove the insulating parts during power outages, and then dry them with fans or incandescent lamps; 2. Replace new insulating parts when drying cannot be done. The above methods require a large number of personnel and persistence, which is time-consuming and labor-intensive, and cannot effectively solve the problem of dampness. Summary of the invention

[0003] In view of the above shortcomings, the present invention provides a busbar drying system in a switch cabinet slot, and the present invention adopts the following technical scheme: comprising: a switch cabinet, an insulating member, a drying device, a collection control unit, a power-off device, and a single-chip microcomputer;

[0004] The bottom side plate of the switch cabinet is equipped with a collection control unit, which includes a temperature sensor, a humidity sensor, and a wind speed measuring device. The temperature sensor can collect temperature data in the switch cabinet, and the humidity sensor can collect humidity data in the switch cabinet; the wind speed measuring device measures the wind speed of the air in the switch cabinet;

[0005] The drying device includes an air inlet device and an air outlet device. The air inlet device is arranged at the bottom of the switch cabinet, and is used to introduce dry gas into the switch cabinet, so that the dry gas flows in the switch cabinet at a specified flow rate, and the introduced air forms a slight positive pressure on the outside to ensure that the outside humid air cannot enter the switch cabinet; the air outlet device is arranged at the top of the switch cabinet, and is used to extract the humid air in the switch cabinet out of the switch cabinet;

[0006] The drying device also includes an incandescent lamp, which is fixedly installed above the insulating member and is used to dry the insulating member;

[0007] The power-off device is connected to the drying device. When the temperature of the switch cabinet exceeds the threshold, the drying device is powered off to protect the switch cabinet from being damaged by high temperature.

[0008] The single chip microcomputer is used to control the drying device, the collection control unit, and the power-off device, to control the flow rate of the dry gas introduced by the drying device in the switch cabinet, to compare the collected temperature data with the set threshold temperature, to compare the collected humidity data with the set threshold humidity, and to determine the current state of the switch cabinet;

[0009] The single chip microcomputer is electrically connected to the collection control unit, the drying device and the power off device.

[0010] In particular, there are several busbar drying systems in the switch cabinet slot and they are arranged in series.

[0011] In particular, the temperature and humidity sensors use single bus communication.

[0012] Particularly, the temperature of the drying gas introduced by the air inlet device is 35° C. and the relative humidity is 40%.

[0013] Particularly, the air inlet device is a dry gas blower, and the air outlet device is a screw vacuum pump.

[0014] Particularly, the single chip microcomputer model is STM32C011 F4P6.

[0015] Particularly, it also comprises a warning device, and the warning device is electrically connected to the single chip microcomputer.

[0016] In particular, it also includes a dehumidification control system, which is electrically connected to the single-chip microcomputer. The dehumidification control system includes a human-computer interaction interface, which can set temperature and humidity sensor thresholds, set wind speed measurement device thresholds, and view warning device information.

[0017] In particular, the specific method of the single chip microcomputer controlling the flow rate of the dry gas introduced into the drying device in the switch cabinet is:

[0018] In the simulation, a vertical upward airflow channel was established to simulate the switch cabinet structure. A cylinder was arranged in the airflow channel to replace various components that may condense in the cabinet. The bottom is the airflow inlet, the top is the airflow outlet, and the two sides are set as walls.

[0019] In the initial state, it is assumed that condensation has occurred on the surface of components in the switch cabinet due to the humidity of the outside air, and the condensation state simulation is realized through computational fluid dynamics numerical simulation;

[0020] Introduce dry airflow into the switch cabinet to simulate the drying and dehumidification process of the airflow;

[0021] Modify in the later simulation according to the actual situation to meet the on-site environment; the on-site environment includes the temperature, humidity and air flow speed of the actual switch cabinet;

[0022] The time required to obtain simulated drying;

[0023] According to the time required for simulated drying and actual needs, confirm the speed of drying gas flowing in the switch cabinet.

[0024] A method for drying busbars in a switch cabinet slot using the above-mentioned busbar drying system in a switch cabinet slot is characterized in that:

[0025] S1. The temperature sensor collects the temperature data in the switch cabinet, the humidity sensor collects the humidity data in the switch cabinet; the wind speed measuring device measures the wind speed;

[0026] S2. Compare the collected temperature data with the set threshold temperature. When the collected temperature is less than the threshold temperature, execute step S3;

[0027] S3. Compare the collected humidity data with the set threshold humidity. When the collected humidity is greater than the threshold humidity, execute step S4;

[0028] S4. Determine the current state of the switch cabinet. If the current switch cabinet is powered on, execute step S5; if the current switch cabinet is powered off, execute step S6;

[0029] S5. The air inlet device introduces dry gas into the switch cabinet, allowing the air to flow at a certain speed in the cabinet. The introduced air forms a slight positive pressure on the outside to ensure that the moist air from the outside cannot enter the switch cabinet;

[0030] S6. The air inlet device introduces dry gas into the switch cabinet, allowing the air to flow at a certain speed in the cabinet. The introduced air forms a slight positive pressure on the outside to ensure that the humid air from the outside cannot enter the switch cabinet. The incandescent lamp is turned on, and the air outlet device extracts the humid air in the switch cabinet out of the switch cabinet.

[0031] S7. When the collected temperature is greater than the threshold temperature, disconnect the drying device.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention solves the problem that switch cabinets in the southern region are susceptible to moisture by installing a collection control unit and a drying device, greatly improves the safe and stable operation level of the power grid, plays an important role in the national economy and social development, and has great promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0034] Figure 1 A series design diagram of a busbar drying system in a switch cabinet slot of the present invention;

[0035] Figure 2A schematic diagram of the dehumidification principle of a busbar drying system in a switch cabinet slot according to the present invention, wherein the dry gas drives away moisture from a wet surface;

[0036] Figure 3 This is a diagram showing the condensation state on the surface of components realized by simulation of a busbar drying system in a switch cabinet slot of the present invention;

[0037] Figure 4 A water vapor velocity distribution cloud diagram of a busbar drying system in a switch cabinet slot of the present invention;

[0038] Figure 5 A temperature distribution cloud diagram of a busbar drying system in a switch cabinet slot of the present invention after drying for 8 seconds;

[0039] Figure 6 The present invention is a flow chart of a busbar drying system in a switch cabinet slot.

[0040] Figure numerals: 1. Cable trench; 2. Dehumidification control system; 3. Collection control unit; 4. Air outlet device; 5. Switch cabinet. DETAILED DESCRIPTION

[0041] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] The embodiment of the present invention provides a busbar drying system in a switch cabinet slot, comprising: a switch cabinet, an insulating component, a drying device, a collection control unit, a power-off device, and a single-chip microcomputer;

[0045] The bottom side panel of the switch cabinet is equipped with a collection control unit, which includes a temperature sensor, a humidity sensor, and a wind speed measuring device. The temperature sensor can collect temperature data in the switch cabinet, and the humidity sensor can collect humidity data in the switch cabinet. The temperature and humidity sensors use a single bus communication; the wind speed measuring device measures the wind speed of the air in the switch cabinet;

[0046] The drying device includes an air inlet device and an air outlet device. The air inlet device is arranged at the bottom of the switch cabinet. The air inlet device adopts a dry gas blower to introduce dry gas into the switch cabinet. The temperature of the dry gas introduced by the air inlet device is 35° C. and the relative humidity is 40%. The dry gas is allowed to flow at a specified flow rate in the switch cabinet. The air outlet device is arranged at the top of the switch cabinet. The air outlet device adopts a screw vacuum pump to extract the wet air in the switch cabinet out of the switch cabinet.

[0047] The drying device also includes an incandescent lamp, which is fixedly installed above the insulating member and is used to dry the insulating member;

[0048] The power-off device is connected to the drying device. When the temperature of the switch cabinet exceeds the threshold, the drying device is powered off to protect the switch cabinet from being damaged by high temperature.

[0049] The single-chip microcomputer model is STM32C011 F4P6, which is used to control the drying device, the incandescent lamp, and the flow rate of the drying gas introduced by the drying device in the switch cabinet, and is used to compare the collected temperature data with the set threshold temperature, and is used to compare the collected humidity data with the set threshold humidity, and is used to judge the current state of the switch cabinet;

[0050] The single chip microcomputer is electrically connected to the acquisition control unit, the drying device, and the incandescent lamp;

[0051] A warning device, the warning device being electrically connected to the single chip microcomputer;

[0052] A dehumidification control system, the dehumidification control system is electrically connected to the single-chip microcomputer, the dehumidification control system includes a human-computer interaction interface, the human-computer interaction interface can set the temperature and humidity sensor thresholds, can set the wind speed measurement device thresholds, and can view the warning device information;

[0053] In this embodiment, several switch cabinets can also be arranged in series to achieve simultaneous drying of multiple switch cabinets. The switch cabinet series design is as follows: Figure 1 As shown, a cable trench 1, a dehumidification control system 2, a collection control unit 3, an air outlet device 4 and a switch cabinet 5 are provided.

[0054] The embodiment of the present invention utilizes the dry air dehumidification principle: for the two situations where the air humidity inside the switch cabinet is high and condensation is easy to occur or condensation has already occurred, according to the physical mechanism of the evaporation phenomenon, the following influencing factors are mainly discussed here.

[0055] (1) Temperature. The main factor that directly affects the dew water temperature is the air temperature inside the cabinet or the temperature of the air passing through the cabinet. At the same time, due to the high air temperature, the amount of water vapor that dry air can carry under the same mass increases, and it is not easy to reach saturation. The relative humidity is low, which makes it more difficult for water vapor in the air to condense. In the past, the use of high-power heaters for dehumidification adopted this heating and dehumidification principle: when the air temperature rises, the evaporation of dew accelerates, and when the water content in the air remains unchanged, the relative humidity will decrease, making it difficult to condense. This method mainly relies on raising the air or dew temperature, so the heating power consumption is relatively large.

[0056] The power required to initially maintain heating is calculated as follows:

[0057] K W =(C1M1ΔT+C2M2ΔT) / (863·H)+P / 2

[0058] Where K w is the power to maintain heating; P is the heat dissipated by the capacitor at the final temperature; H is the time required to heat from the initial temperature to the final temperature; M is the mass of the capacitor and the dielectric; C1 and C2 are the specific heat capacities of the capacitor and the dielectric respectively; ΔT is the difference between the final temperature and the initial temperature.

[0059] The power required to maintain the medium temperature is calculated as follows:

[0060] K W =C2M3ΔT / 863+P

[0061] Where M3 is the rate of increase of medium mass.

[0062] (2) Humidity: Under the same temperature conditions, if the air humidity in the cabinet is lower, the evaporation of the dew surface will be greater; at the same time, due to the low relative humidity of the air, it is also ensured that the water vapor in the air is not easy to condense. The present invention relies on first condensing the air in the front-end dehumidification process and then increasing the temperature to reduce the moisture content and relative humidity of the air, thereby ensuring a good dehumidification effect after entering the cabinet.

[0063] (3) Wind speed: When the wind speed reaches a certain level, the evaporation of the dew surface tends to be stable. At this time, the wind speed has a relatively small impact on it. At the same time, if the air with low relative humidity is ensured to flow into the cabinet continuously, the air with high humidity in the cabinet can be taken out, thus forming a good evaporation environment, and the water vapor in the air will not condense. In addition to the most important wind speed, dehumidification by air flow is also related to multiple factors such as the turbulent characteristics of the airflow (the position and shape of the airflow nozzle in the cabinet), the diffusion path of water vapor (cabinet structure, equipment layout), etc., which can be considered step by step during the research process.

[0064] The principle of dehumidification of wet surfaces by dry air flow is as follows Figure 2 As shown. The principle of this research technology is to introduce dry air with low humidity and slightly heated by the waste heat of the machine into the cabinet, so that the air flows at a certain speed in the cabinet, so that the existing dew evaporates quickly. The existing humid air entering from the gaps in the cabinet can also be dried or squeezed out of the cabinet by the airflow, thereby ensuring the safety of the equipment. As air is introduced into the cabinet, a slight positive pressure is formed on the outside, ensuring that the humid air from the outside cannot enter the cabinet, further ensuring the safety of the equipment.

[0065] The specific method of using a single chip microcomputer to control the flow rate of the dry gas introduced into the drying device in the switch cabinet is:

[0066] A simulation was carried out to establish a vertical upward airflow channel to simulate the switch cabinet structure. A cylinder was arranged in the airflow channel to replace various components in the cabinet that may condense. The bottom was the airflow inlet, the top was the airflow outlet, and the two sides were set as walls.

[0067] In the initial state, it is assumed that condensation has formed on the surface of components in the switch cabinet due to the humidity of the outside air. The condensation state simulation is realized through computational fluid dynamics (CFD) numerical simulation, such as Figure 3 The humid air condenses on the surface of the components, and due to the effect of gravity, the dew hangs downward, indicating that the simulation of the initial condensation state has been completed.

[0068] At this time, the air temperature in the switch cabinet (and the environment) is 25°C and the relative humidity is 90%. Dry gas is introduced into the switch cabinet to simulate the drying and dehumidification process of the airflow. The water vapor velocity distribution cloud diagram is shown in the figure below. Figure 4As shown, it can be observed that dry air is introduced from the bottom at a speed of 1m / s. After being adjusted by the external air handling equipment (heating, dehumidification and purification), the dry air has a temperature of 35°C and a relative humidity of 40%. When the dry air enters the cabinet, it will flow around the components to dry and dehumidify the surface of the components. Since the components themselves will hinder the passage of airflow, the disturbance effect of accelerating or strengthening mechanical turbulence will be generated when the airflow passes through the surface of the components. Both of these physical phenomena will enhance the dehumidification effect of the airflow. When the airflow flows through the components, the front of the components hinders the passage of the airflow, so the airflow bypasses the two sides and accelerates the airflow around the cylinder, which will enhance the dehumidification effect; at the same time, there is less airflow on the back of the components, and the wind speed is lower because it is in the leeward area. At this time, the dehumidification effect will be slightly worse in theory, but because the airflow will generate eddies when bypassing the components, heat and mass transfer will be enhanced, which will enhance the dehumidification effect on the back of the components.

[0069] 5 seconds after the dry gas is introduced, the liquid water on the surface of the component begins to evaporate, and gaseous water components begin to appear nearby. The gaseous water (i.e., water vapor) just generated by evaporation will be quickly carried away from the surface of the component by the air, and drying will be gradually achieved.

[0070] The temperature distribution in the cabinet after drying for 8 seconds is as follows Figure 5 As shown. Due to the introduction of dry gas, the temperature of most locations in the cabinet has reached the dry air temperature, and the condensation on the surface of the component that has not been completely evaporated is concentrated on the leeward side of the component under the purge of the air below. At this time, the air flow temperature behind the leeward side is affected by the heat absorption of evaporation and is significantly lower than the dry air temperature, which also shows that the evaporation process is in progress. At the same time, after drying for 8 seconds, it can be observed that the liquid water on the surface of the component has been significantly reduced compared to the initial state, and is about to be completely evaporated and disappear, indicating that under this working condition, the surface of the component can be dried in about 10 seconds.

[0071] When the switch cabinet is already filled with dry hot air and the dry gas is still entering the switch cabinet at a stable small flow rate, a micro-positive pressure environment is formed inside the cabinet with extremely low energy consumption, which isolates the cabinet from the external humid air and prevents condensation from occurring, thus ensuring the safety of the equipment.

[0072] The specific drying method of this embodiment is as follows Figure 6 The steps shown are as follows:

[0073] S1. The temperature sensor collects the temperature data in the switch cabinet, the humidity sensor collects the humidity data in the switch cabinet; the wind speed measuring device measures the wind speed;

[0074] S2. Compare the collected temperature data with the set threshold temperature. When the collected temperature is less than the threshold temperature, execute step S3;

[0075] S3. Compare the collected humidity data with the set threshold humidity. When the collected humidity is greater than the threshold humidity, execute step S4;

[0076] S4. Determine the current state of the switch cabinet. If the current switch cabinet is powered on, execute step S5; if the current switch cabinet is powered off, execute step S6;

[0077] S5. The air inlet device introduces dry gas into the switch cabinet, allowing the air to flow at a certain speed in the cabinet. The introduced air forms a slight positive pressure on the outside to ensure that the moist air from the outside cannot enter the switch cabinet;

[0078] S6. The air inlet device introduces dry gas into the switch cabinet, allowing the air to flow at a certain speed in the cabinet. The introduced air forms a slight positive pressure on the outside to ensure that the humid air from the outside cannot enter the switch cabinet. The incandescent lamp is turned on, and the air outlet device extracts the humid air in the switch cabinet out of the switch cabinet.

[0079] S7. When the collected temperature is greater than the threshold temperature, disconnect the drying device.

[0080] The technical effects of this embodiment are as follows:

[0081] 1. This embodiment monitors the temperature, humidity and gas flow rate in the switch cabinet by setting sensors to ensure that the environment in the switch cabinet is maintained at a safe level;

[0082] 2. This embodiment provides a drying device to quickly dry the insulating component, reduce the probability of the insulating component absorbing water, and protect the insulating capacity of the insulating component;

[0083] 3. This embodiment is highly adjustable: the temperature, humidity, and gas flow rate thresholds can be set through the human-machine interface to adapt to different switch cabinets and meet the needs of different environmental conditions;

[0084] 4. This embodiment has good stability: the sensor adopts single bus communication to avoid sequence confusion and sensor judgment errors.

[0085] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A busbar drying system in a switch cabinet slot, characterized in that: include: Switch cabinet, insulation parts, drying device, acquisition control unit, power-off device, single-chip microcomputer; The bottom side plate of the switch cabinet is equipped with a collection control unit, which includes a temperature sensor, a humidity sensor, and a wind speed measuring device. The temperature sensor can collect temperature data in the switch cabinet, and the humidity sensor can collect humidity data in the switch cabinet; the wind speed measuring device measures the wind speed of the air in the switch cabinet; The drying device includes an air inlet device and an air outlet device. The air inlet device is arranged at the bottom of the switch cabinet, and is used to introduce dry gas into the switch cabinet, so that the dry gas flows in the switch cabinet at a specified flow rate, and the introduced air forms a slight positive pressure on the outside to ensure that the outside humid air cannot enter the switch cabinet; the air outlet device is arranged at the top of the switch cabinet, and is used to extract the humid air in the switch cabinet out of the switch cabinet; The drying device also includes an incandescent lamp, which is fixedly installed above the insulating member and is used to dry the insulating member; The power-off device is connected to the drying device. When the temperature of the switch cabinet exceeds the threshold, the drying device is powered off to protect the switch cabinet from being damaged by high temperature. The single chip microcomputer is used to control the drying device, the collection control unit, and the power-off device, to control the flow rate of the dry gas introduced by the drying device in the switch cabinet, to compare the collected temperature data with the set threshold temperature, to compare the collected humidity data with the set threshold humidity, and to determine the current state of the switch cabinet; The single chip microcomputer is electrically connected to the collection control unit, the drying device and the power off device.

2. According to the switch cabinet slot busbar drying system according to claim 1, there are several switch cabinet slot busbar drying systems and they are arranged in series.

3. According to the busbar drying system in the switch cabinet slot as described in claim 1, the temperature and humidity sensors use single bus communication.

4. According to the busbar drying system in the switch cabinet slot as claimed in claim 1, the temperature of the drying gas introduced by the air inlet device is 35°C and the relative humidity is 40%.

5. According to the busbar drying system in the switch cabinet slot as claimed in claim 1, the air inlet device adopts a dry gas blower, and the air outlet device adopts a screw vacuum pump.

6. The busbar drying system in a switch cabinet slot according to claim 1, wherein the single chip microcomputer model is STM32C011F4P6.

7. The busbar drying system in a switch cabinet slot according to claim 1 further comprises a warning device, wherein the warning device is electrically connected to the single chip microcomputer.

8. According to claim 1, a busbar drying system in a switch cabinet slot also includes a dehumidification control system, which is electrically connected to the single-chip microcomputer. The dehumidification control system includes a human-computer interaction interface, which can set temperature and humidity sensor thresholds, set wind speed measurement device thresholds, and view warning device information.

9. According to the busbar drying system in the switch cabinet slot of claim 1, the specific method of controlling the flow rate of the drying gas introduced into the switch cabinet by the single chip microcomputer is: In the simulation, a vertical upward airflow channel was established to simulate the switch cabinet structure. A cylinder was arranged in the airflow channel to replace various components that may condense in the cabinet. The bottom is the airflow inlet, the top is the airflow outlet, and the two sides are set as walls. In the initial state, it is assumed that condensation has occurred on the surface of components in the switch cabinet due to the humidity of the outside air, and the condensation state simulation is realized through computational fluid dynamics numerical simulation; Introduce dry airflow into the switch cabinet to simulate the drying and dehumidification process of the airflow; Modify in the later simulation according to the actual situation to meet the on-site environment; the on-site environment includes the temperature, humidity and air flow speed of the actual switch cabinet; The time required to obtain simulated drying; According to the time required for simulated drying and actual needs, confirm the speed of drying gas flowing in the switch cabinet.

10. A method for drying busbars in switch cabinet slots using the above-mentioned busbar drying system in switch cabinet slots, characterized in that: S1. The temperature sensor collects the temperature data in the switch cabinet, the humidity sensor collects the humidity data in the switch cabinet; the wind speed measuring device measures the wind speed; S2. Compare the collected temperature data with the set threshold temperature. When the collected temperature is less than the threshold temperature, execute step S3; S3. Compare the collected humidity data with the set threshold humidity. When the collected humidity is greater than the threshold humidity, execute step S4; S4. Determine the current state of the switch cabinet. If the current switch cabinet is powered on, execute step S5; if the current switch cabinet is powered off, execute step S6; S5. The air inlet device introduces dry gas into the switch cabinet, allowing the air to flow at a certain speed in the cabinet. The introduced air forms a slight positive pressure on the outside to ensure that the moist air from the outside cannot enter the switch cabinet; S6. The air inlet device introduces dry gas into the switch cabinet, allowing the air to flow at a certain speed in the cabinet. The introduced air forms a slight positive pressure on the outside to ensure that the humid air from the outside cannot enter the switch cabinet. The incandescent lamp is turned on, and the air outlet device extracts the humid air in the switch cabinet out of the switch cabinet. S7. When the collected temperature is greater than the threshold temperature, disconnect the drying device.

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