Substation power equipment environment adaptive temperature and humidity control method and power equipment

Abstract

The invention discloses an environment self-adaptive temperature and humidity control method for power equipment of a transformer substation and the power equipment, and the method comprises the steps: taking a water vapor density value in air inside and outside the equipment as a dehumidification start-stop control response, and starting dehumidification when the water vapor density value inside the equipment is greater than the water vapor density value outside the equipment; and when the water vapor density value inside the equipment is smaller than or equal to the water vapor density value outside the equipment, dehumidification is stopped. The water vapor density value in the air inside and outside the equipment serves as dehumidification start-stop control response, the control method does not need to manually set fixed control parameters, the equipment automatically adapts to any external environment change, and the environment control effect is improved.

Description

Technical Field

[0001] This invention relates to the field of temperature and humidity control technology for substation power equipment, specifically to an environmentally adaptive temperature and humidity control method and power equipment for substation power equipment. Background Technology

[0002] Substation power equipment (such as outdoor terminal boxes and control cabinets) operate in harsh environments such as rain, sun exposure, and dust for extended periods. Due to poor structural sealing and a lack of effective internal environmental management measures, many outdoor terminal boxes and control cabinets in substations suffer from varying degrees of moisture, corrosion, and dirt. In severe cases, this can lead to reduced insulation of internal secondary terminals, broken secondary cables, and damaged components. Consequently, important primary equipment such as circuit breakers and disconnect switches may malfunction, fail to operate, or send false signals, posing a significant risk to the safe and stable operation of the power grid.

[0003] Traditional methods for preventing moisture and condensation in outdoor electrical enclosures include ventilation with louvers, aluminum alloy heaters, semiconductor dehumidifiers, and industrial air conditioning. Each of these methods has its drawbacks. The following explanation uses an outdoor terminal box as an example: Ventilation through louvers can allow dust and humid air from outside to enter the cabinet, causing dirt buildup and further deteriorating the internal environment.

[0004] Aluminum alloy heaters cannot expel humid air, and heating is uneven, making the cabinet walls, which are in contact with the external environment, prone to condensation. Furthermore, aluminum alloy heaters pose a significant electrical fire risk; their placement inside the cabinet lacks effective fire safety measures, and an electrical fire could damage the internal circuitry and components.

[0005] Semiconductor dehumidifiers have several drawbacks. First, their dehumidification effect is significantly affected by the ambient temperature, making them suitable for indoor environments with relatively stable conditions. Outdoor high and low temperatures drastically reduce their dehumidification efficiency. Second, because condensation on the cooling coils only drips when it forms sufficiently large droplets, and due to the adhesion of the water tank and drain pipe, the condensate is difficult to completely drain. In fact, a large portion remains inside the terminal box and will re-evaporate. Third, the drain pipe leads to the bottom cable trench, effectively creating a channel for humid air from the cable trench to enter the terminal box.

[0006] Industrial air conditioners are large in size and not suitable for installation in small cabinets such as terminal boxes. Furthermore, industrial air conditioners have a high failure rate, high maintenance costs, and low economic efficiency.

[0007] Structurally, the ventilation holes in traditional terminal box bases are small and cannot effectively ventilate, causing moisture from the cable trench to accumulate inside the base, resulting in severe corrosion over time and compromising the structural stability of the terminal box.

[0008] From a control principle perspective, commonly used humidity sensors output relative humidity values. Traditional dehumidifiers use relative humidity as a criterion, controlling the dehumidifier's start and stop by setting a fixed value. However, since relative humidity changes with temperature and cannot reflect the actual water vapor content in the air, using relative humidity as a criterion is prone to misjudgment. Outdoor environments vary with seasons and regions, making the set value method inflexible and prone to frequent changes that significantly increase maintenance costs. Therefore, the control strategies of traditional dehumidifiers are unsuitable for outdoor applications.

[0009] Due to the aforementioned shortcomings, the current situation is that terminal boxes and control cabinets still suffer from serious problems of moisture, dirt, and even condensation. This frequently leads to short circuits.

[0010] Therefore, this patent application is filed. Summary of the Invention

[0011] To address the aforementioned technical problems, this invention first provides an environmentally adaptive temperature and humidity control method for substation power equipment. From the perspective of control principles, this method achieves an environmentally adaptive control effect, enabling the equipment to automatically adapt to the external environment and realize a "start-and-forget" mode, greatly facilitating user operation. Secondly, this invention provides substation power equipment, which can be an outdoor terminal box or control cabinet. The structure of the power equipment is improved to minimize internal condensation, achieving excellent moisture-proof and anti-condensation effects.

[0012] This invention is achieved using the following technical solution: The first objective of this invention is to provide an adaptive temperature and humidity control method for substation power equipment, characterized in that the water vapor density values ​​in the air inside and outside the equipment are used as the dehumidification start-stop control response; when the water vapor density value inside the equipment is greater than the water vapor density value outside the equipment, dehumidification is started; when the water vapor density value inside the equipment is less than or equal to the water vapor density value outside the equipment, dehumidification is stopped.

[0013] Preferably, the method for obtaining the water vapor density value in the air inside and outside the equipment is as follows: Collect the internal ambient temperature and relative humidity of the equipment, and the external ambient temperature and relative humidity of the equipment, respectively. The internal environment water vapor density value is obtained based on the internal environment temperature and internal environment relative humidity values. The external ambient water vapor density value is obtained based on the external ambient temperature and relative humidity.

[0014] Preferably, the method for calculating the water vapor density value is as follows: ; Where RH is the relative humidity value and t is the ambient temperature.

[0015] Preferably, it also includes: When dehumidification is not started, the device detects whether the difference between the internal ambient temperature and the external ambient temperature is less than a first set value. If it is less than the first set value, heating is started. If the difference between the internal ambient temperature and the external ambient temperature is greater than a second set value, ventilation is started. If it is less than the second set value but greater than the first set value, heating and ventilation are stopped. If dehumidification is enabled, heating and ventilation will both stop.

[0016] Preferably, the second set value is greater than the first set value; And / or, the first setting value is 10°C, and the second setting value is 15°C.

[0017] Preferably, the system also includes automatic control timing optimization, wherein the automatic control timing optimization process is as follows: Obtain the time series of operational events and the time series of temperature and humidity changes; Align the operation event time series with the internal temperature and humidity change time series of the equipment according to time, analyze the time relationship between the time when the internal temperature and humidity reach the limit and the time when the equipment starts and stops, calculate the time difference between the two times and save it. When the power equipment starts up again, the saved time difference parameters will be incorporated into the dehumidification control process, and the dehumidification control timing of the power equipment will be adjusted.

[0018] Preferably, the operation event is a start / stop command operation, which includes dehumidification start / stop, heating start / stop, and ventilation start / stop commands.

[0019] The second objective of this invention is to provide a substation power equipment that implements the environmental adaptive temperature and humidity control method described in any of the preceding claims, including a control system, a housing, a front door, and a rear door. The control system includes an internal temperature and humidity sensor, an external temperature and humidity sensor, a controller, and a dehumidifier. The internal temperature and humidity sensor and the controller are both installed on the dehumidifier. The dehumidifier is installed on the front door, and the external temperature and humidity sensor is installed on the surface of the front door near the outside of the housing. The dehumidifier is a rotary type and is embedded in the front door to form an exposed structure.

[0020] Preferably, an exhaust fan and an air intake are provided on the front door, and an exhaust fan and an exhaust outlet are provided on the rear door. The exhaust fan and the air intake are both located on the upper part of the dehumidifier. The dehumidifier is equipped with a humid air inlet and a dry air outlet. The humid air inlet is located below the dry air outlet, and the dry air outlet is located below the controller. A humid air exhaust outlet is also provided at the bottom of the exposed protective cover of the dehumidifier.

[0021] Preferably, the bottom of the box is also provided with a base, and the base has ventilation holes.

[0022] The advantages and beneficial effects of this invention compared to the prior art are: 1. This invention provides an adaptive temperature and humidity control method for substation power equipment. The method uses the water vapor density values ​​in the air inside and outside the equipment as the dehumidification start-stop control response. This control method eliminates the need for manually setting fixed control parameters; the equipment automatically adapts to any changes in the external environment, improving environmental control effectiveness. Simultaneously, the controller records the operation sequence and temperature and humidity change curves for each equipment start-stop process, analyzes and optimizes the control sequence, continuously improving control accuracy and increasing the duty cycle of the equipment start-stop sequence to reduce energy consumption. Thus, the equipment automatically adapts to any changes in the external environment and automatically optimizes the control sequence, improving environmental control effectiveness and reducing energy consumption.

[0023] 2. The power equipment provided in this embodiment of the invention uses a rotary dehumidifier, whose dehumidification effect is less affected by the ambient temperature. Furthermore, the treated dry, hot air simultaneously provides uniform heating, maintaining a temperature inside the terminal box that is uniformly higher than the external environment. This minimizes the risk of internal condensation and solves the problem of uneven heating by the aluminum alloy heater. The dehumidifier's embedded design on the cabinet door allows for factory prefabrication and on-site door replacement; it also reduces redundancy of equipment inside the terminal box, lowering the risk of electrical fires. Additionally, the processing air inlet and outlet face inwards, while the regenerated air exhaust outlet faces outwards, directly discharging humid air to the external environment and preventing backflow of external humid air.

[0024] Rotary dehumidifiers are appropriately sized, have suitable terminal boxes for installation, and are simple in structure and easy to maintain, thus solving the problems of high failure rates and high maintenance costs associated with industrial air conditioners.

[0025] 3. The power equipment provided in this embodiment of the invention can perform active ventilation, dehumidification and temperature control, thereby extending the life of the dehumidification equipment and saving energy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A flowchart of an environmental adaptive temperature and humidity control method for power equipment in a substation, provided as an embodiment of the present invention.

[0027] Figure 2 This is a flowchart of temperature control in the control method provided in an embodiment of the present invention.

[0028] Figure 3 The flowchart illustrates the automatic optimization of control timing in the control method provided in this embodiment of the invention.

[0029] Figure 4 This is a front view of an outdoor terminal box provided in an embodiment of the present invention.

[0030] Figure 5 This is a rear view of an outdoor terminal box provided in an embodiment of the present invention.

[0031] Figure 6 This is a bottom view of an outdoor terminal box provided in an embodiment of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure of an outdoor terminal box provided in an embodiment of the present invention, showing the front door located on one side inside the box.

[0033] Figure 8 This is a schematic diagram of the structure of an outdoor terminal box provided in an embodiment of the present invention, showing that the rear door is located on one side inside the box.

[0034] The markings and the components they represent in the attached diagram are as follows: 1-Box body, 2-Front door, 3-Rear door, 4-Internal temperature and humidity sensor, 6-Controller, 7-Dehumidifier, 8-Exhaust fan, 9-Exhaust inlet, 10-Exhaust fan, 11-Exhaust outlet, 12-Humid air inlet, 13-Dry air outlet, 14-Humid air outlet, 15-Protective cover, 16-Base, 17-Ventilation hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, circuits, materials, or methods have not been specifically described in order to avoid obscuring the invention.

[0037] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] In the description of this invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention. Example

[0039] This embodiment provides an environmentally adaptive temperature and humidity control method for substation power equipment. This power equipment can be an outdoor terminal box, or a control cabinet, mechanism box, or other metal electrical cabinet that requires moisture protection.

[0040] like Figure 1 The control principle shown in this embodiment uses the water vapor density values ​​of the air inside and outside the equipment as the dehumidification start / stop control response. When the water vapor density value inside the equipment is greater than the water vapor density value outside the equipment, dehumidification is started; when the water vapor density value inside the equipment is less than or equal to the water vapor density value outside the equipment, dehumidification is stopped.

[0041] The method for obtaining the water vapor density values ​​in the air inside and outside the equipment is as follows: Collect the internal ambient temperature and relative humidity of the equipment, and the external ambient temperature and relative humidity of the equipment, respectively. The internal environment water vapor density value is obtained based on the internal environment temperature and internal environment relative humidity values. The external ambient water vapor density value is obtained based on the external ambient temperature and relative humidity.

[0042] The method for calculating the water vapor density value is as follows: ; Where RH represents relative humidity and t represents ambient temperature. Internal and external temperature and humidity sensors are installed both inside and outside the equipment, respectively. These sensors allow for the simultaneous acquisition of both temperature and relative humidity data. The water vapor density values ​​of the internal and external air can then be obtained using the formula above. This formula is derived from a combination of the Clausius-Clapeyron equation and the ideal gas law.

[0043] In this embodiment, after comparing the water vapor density values ​​inside and outside the cabinet, if the water vapor density inside the cabinet is higher than the water vapor density in the external environment, the dehumidifier is activated to dehumidify. During the dehumidifier's operation, the internal and external water vapor densities are monitored in real time. When the internal water vapor density approaches or equals the external water vapor density, the dehumidifier stops. This control method eliminates the need for manually setting fixed control parameters; the equipment automatically adapts to any changes in the external environment, improving environmental control effectiveness.

[0044] Furthermore, such as Figure 2 As shown, when dehumidification is not activated, the system detects whether the difference between the internal and external ambient temperatures (internal ambient temperature - external ambient temperature) is less than a first set value (e.g., 10°C). If it is less than the first set value, heating (i.e., activating the dehumidifier) ​​is activated. The heating function uses the dehumidifier to draw humid air into the cabinet and heat it to raise the air temperature inside the cabinet. If the difference between the internal and external ambient temperatures is greater than a second set value (e.g., 15°C), ventilation (i.e., activating the front and rear exhaust fans) is activated. If the difference between the internal and external ambient temperatures is less than the second set value but greater than the first set value, heating and ventilation are stopped, and the dehumidifier and front and rear exhaust fans are turned off. When dehumidification is activated, both the dehumidifier heating function and ventilation are stopped, and the front and rear exhaust fans stop working. This ensures that the temperature inside the cabinet is always maintained at a suitable level.

[0045] Furthermore, the control method provided in this embodiment also includes automatic control timing optimization, the automatic control timing optimization process being as follows: Obtain the time series of operational events and the time series of temperature and humidity changes; the operational events are power equipment start-up and shutdown control operations. Align the operation event time series with the temperature and humidity change time series according to time, analyze the temporal relationship between the time when the temperature and humidity reach the limit and the time when the equipment starts and stops, calculate the time difference between the two times and save it; When the power equipment starts up again, the saved time difference parameters will be brought into the control process and the control timing of the power equipment will be adjusted.

[0046] like Figure 3As shown, specifically, the operation event is a start / stop command operation, which includes start / stop commands for dehumidification, heating, ventilation, etc. When the controller issues a start / stop command to the equipment (here, start / stop commands include the aforementioned start / stop commands for dehumidification, heating, ventilation, etc.), the controller simultaneously records the operation events in the SOE event report, that is, it saves the data of each operation process (including starting and stopping) for the dehumidifier, exhaust fan, etc., forming an operation event time sequence. At the same time, the controller records temperature and humidity data at 1-second intervals, with each data point corresponding to a time point, forming a temperature and humidity change time sequence. After each complete operation, the operation event time sequence and the temperature and humidity change time sequence are aligned according to time, and the temporal relationship between the time when the temperature and humidity reach the limit and the time when the equipment starts / stops is analyzed. The time difference is calculated (this process is to calculate the difference between the stop command time and the time when the control point is reached) and saved. In the next operation, the saved time difference parameter is brought into the control process (specifically the dehumidification control process) to determine whether the compensation data needs to be updated. If so, the original data is overwritten, thereby adjusting the control timing. By continuously repeating this process, precise control can be achieved, while maximizing the duty cycle and significantly reducing energy consumption. Example

[0047] This embodiment provides a power equipment, taking an outdoor terminal box as an example.

[0048] The terminal box includes a control system, a box body 1, a front door 2, and a rear door 3. The control system implements the control method described in Example 1.

[0049] like Figures 4-8 As shown, the control system includes an internal temperature and humidity sensor 4, an external temperature and humidity sensor, a controller 6, and a dehumidifier 7. The internal temperature and humidity sensor 4 and the controller 6 are both installed on the dehumidifier 7, which is fixedly installed on the front door 2. The external temperature and humidity sensor is installed on the surface of the front door 2 near the outside of the cabinet 1. The external temperature and humidity sensor can also be installed on other external support components.

[0050] The dehumidifier 7 is a rotary type, and the dehumidifier 7 is embedded in the front door 2 to form an exposed structure.

[0051] This embodiment employs a rotary dehumidifier 7, which utilizes physical adsorption and the discharge of dry, hot airflow, resulting in dehumidification performance minimally affected by ambient temperature. Furthermore, the dry, hot air processed by the rotary dehumidifier 7 simultaneously achieves uniform heating, resolving the issue of uneven heating in aluminum alloy heaters. The rotary dehumidifier 7 is appropriately sized, its terminal box is suitable for installation, and its simple structure facilitates maintenance, effectively addressing the problems of high failure rates and high maintenance costs associated with industrial air conditioning systems.

[0052] Furthermore, the design of embedding the dehumidifier 7 into the cabinet door allows for factory prefabrication and on-site door replacement without power outages; it also reduces redundancy of equipment inside the terminal box, lowering the risk of electrical fires. Additionally, embedding the dehumidifier 7 into the cabinet door ensures that the air inlet and outlet face inwards, while the regenerated air exhaust outlet faces outwards, directly expelling humid air to the external environment and preventing backflow of humid external air.

[0053] Furthermore, an exhaust fan 8 and an exhaust inlet 9 are provided on the side of the front door 2 near the interior of the housing 1, and an exhaust fan 10 and an exhaust outlet 11 are provided on the rear door 3. The exhaust fan and the exhaust inlet 9 are both installed above the dehumidifier 7.

[0054] The dehumidifier 7 is provided with a humid air inlet 12 and a dry air outlet 13, with the humid air inlet 12 located at the bottom and the dry air outlet 13 at the top, respectively located on two opposite side walls of the dehumidifier 7. The dry air outlet 13 is located below the controller 6. The dehumidifier 7 is also provided with a protective cover 15 at the exposed part of the front door 2, and a humid air exhaust outlet 14 is provided at the bottom of the protective cover 15.

[0055] In this embodiment, the exhaust fan 8 draws air from the external environment into the terminal box through the exhaust inlet 9, while the exhaust fan 10 located on the rear door 3 exhausts air from inside the terminal box to the external environment through the exhaust outlet 11 on the rear door 3. Ventilation is achieved through the front and rear exhaust fans and corresponding air vents. Controlled by the controller 6, when the external ambient air temperature and humidity are favorable, activating the exhaust fans enhances internal and external air convection, replacing the dehumidifier 7 and saving energy.

[0056] During dehumidification, the dehumidifier 7 starts, drawing in the humid air through the lower humid air inlet 12. The drawn-in humid air is processed to generate dry air, which is then discharged through the dry air outlet 13 back into the terminal box. The high-humidity air generated after dehumidification is discharged into the external environment through the humid air outlet 14. During the operation of the rotary dehumidifier 7, if the external temperature and humidity meet the requirements, the controller 6 will activate the exhaust fan 8 at the front door 2, drawing outside air into the terminal box.

[0057] During heating, controller 6 activates the rotary dehumidifier 7, drawing air from the housing 1 into the dehumidifier 7 through the humid air inlet 12. The drawn-in humid air is heated and then discharged through the dry air outlet 13, returning to the terminal box and raising the air temperature inside the terminal box.

[0058] In this embodiment, a base 16 is provided at the bottom of the housing 1, and ventilation holes 17 are provided around the base 16. The ventilation holes 17 are long and large, which can enhance air convection, solve the problem of metal corrosion caused by the accumulation of humid air inside the base 16, reduce the accumulation of humid air in the cable trench, reduce the workload of the dehumidifier 7, and save energy. At the same time, in this invention, the housing 1 is fully enclosed, and only three locations—the air intake 9 of the front door 2, the humid air exhaust outlet 14, and the exhaust outlet 11 of the rear door 3—are connected to the external environment through dust filter material.

[0059] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for adaptive temperature and humidity control of power equipment in a substation, characterized in that, The dehumidification start-stop control response is based on the water vapor density values ​​of the air inside and outside the equipment. Dehumidification starts when the water vapor density inside the equipment is greater than that outside the equipment, and stops when the water vapor density inside the equipment is less than or equal to that outside the equipment.

2. The environmental adaptive temperature and humidity control method for substation power equipment according to claim 1, characterized in that, The method for obtaining the water vapor density values ​​in the air inside and outside the equipment is as follows: Collect the internal ambient temperature and relative humidity of the equipment, and the external ambient temperature and relative humidity of the equipment, respectively. The internal environment water vapor density value is obtained based on the internal environment temperature and internal environment relative humidity values. The external ambient water vapor density value is obtained based on the external ambient temperature and relative humidity.

3. The environmental adaptive temperature and humidity control method for substation power equipment according to claim 2, characterized in that, The method for calculating the water vapor density value is as follows: ； Where RH is the relative humidity value and t is the ambient temperature.

4. The environmental adaptive temperature and humidity control method for substation power equipment according to claim 1, characterized in that, Also includes: When dehumidification is not started, the device detects whether the difference between the internal ambient temperature and the external ambient temperature is less than a first set value. If it is less than the first set value, heating is started. If the difference between the internal ambient temperature and the external ambient temperature is greater than a second set value, ventilation is started. If it is less than the second set value but greater than the first set value, heating and ventilation are stopped. If dehumidification is enabled, heating and ventilation will both stop.

5. The environmental adaptive temperature and humidity control method for substation power equipment according to claim 4, characterized in that, The second setting value is greater than the first setting value; And / or, the first setting value is 10°C, and the second setting value is 15°C.

6. The environmental adaptive temperature and humidity control method for substation power equipment according to claim 4, characterized in that, It also includes automatic control timing optimization, the automatic control timing optimization process is as follows: Obtain the time series of operational events and the time series of temperature and humidity changes; Align the operation event time series with the internal temperature and humidity change time series according to time, analyze the time relationship between the time when the internal temperature and humidity reach the limit and the time when the equipment starts and stops, calculate the time difference between the two times and save it. When the power equipment starts up again, the saved time difference parameters will be brought into the control process and the control timing of the power equipment will be adjusted.

7. The environmental adaptive temperature and humidity control method for substation power equipment according to claim 6, characterized in that, The operation event is a start / stop command operation, which includes dehumidification start / stop, heating start / stop, and ventilation start / stop commands.

8. A substation power equipment implementing the environmental adaptive temperature and humidity control method as described in any one of claims 1 to 7, characterized in that, The system includes a control system, a housing (1), a front door (2), and a rear door (3). The control system includes an internal temperature and humidity sensor (4), an external temperature and humidity sensor, a controller (6), and a dehumidifier (7). The internal temperature and humidity sensor (4) and the controller (6) are both installed on the dehumidifier (7). The dehumidifier (7) is installed on the front door (2). The external temperature and humidity sensor is installed on the surface of the front door (2) near the outside of the housing (1). The dehumidifier (7) is a rotary type, and the dehumidifier (7) is embedded in the front door (2) to form an exposed structure.

9. The substation power equipment according to claim 8, characterized in that, An exhaust fan (8) and an exhaust inlet (9) are provided on the front door (2), and an exhaust fan (10) and an exhaust outlet (11) are provided on the rear door (3). The exhaust fan (8) and the exhaust inlet (9) are both located on the upper part of the dehumidifier (7). The dehumidifier (7) is provided with a humid air inlet (12) and a dry air outlet (13). The humid air inlet (12) is located below the dry air outlet (13), and the dry air outlet (13) is located below the controller (6). A humid air exhaust outlet (14) is also provided at the bottom of the exposed protective cover (15) of the dehumidifier (7).

10. The substation power equipment according to claim 8, characterized in that, The bottom of the box (1) is also provided with a base (16), and the base (16) is provided with ventilation holes (17).

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