Switchgear automatic dehumidification method and system

Abstract

The application discloses a kind of switch cabinet automatic dehumidification method and system, comprising: step 1: collection switch cabinet internal dehumidification related data;The dehumidification related data includes air temperature, air relative humidity and metal wall temperature;Step 2: based on the air temperature and air relative humidity of step 1 acquisition, calculate the dew point temperature corresponding to the current internal air temperature and air relative humidity of switch cabinet;Step 3: based on the metal wall temperature and air temperature of step 1 acquisition, and the dew point temperature corresponding to the current internal air temperature and air relative humidity of switch cabinet calculated in step 2, determine the working power of dehumidification device;Step 4: make dehumidification device according to the working power of dehumidification device determined in step 3 runs preset dehumidification time interval, then re-executes step 1 to step 3.The application can effectively solve the condensation problem in switch cabinet, with simple method, easy to program implementation, low energy consumption, dehumidification efficiency and other outstanding advantages.

Description

Technical Field

[0001] This invention relates to the field of power equipment operation and maintenance technology, specifically to an automatic dehumidification method and system for switchgear. Background Technology

[0002] Switchgear is a critical piece of equipment in power systems used for power distribution, control, and protection. In humid environments, especially in areas with large diurnal temperature variations, water vapor in the air inside the switchgear easily condenses into water droplets on metal walls and insulating surfaces where the temperature is below the dew point, forming condensation. Condensation significantly reduces the insulation strength of electrical equipment, leading to corrosion of the equipment inside the cabinet, and even causing serious faults such as partial discharge, creepage, and flashover, directly threatening the safe and stable operation of the power system.

[0003] Currently, common dehumidification methods for switchgear mainly include heater dehumidification and condensation dehumidification. Heater dehumidification requires installing a heater inside the cabinet to lower relative humidity by increasing air temperature. This method is energy-intensive, cannot fundamentally reduce the absolute water vapor content of the air, and cannot control the heater's operation based on dew point temperature. It may not operate when dehumidification is needed and may start when dehumidification is not required. Furthermore, improper selection of heating power or installation location may cause localized overheating, worsening condensation. Condensation dehumidification uses devices such as semiconductor cooling chips to cool the air below the dew point, causing water to condense. This method typically starts the equipment at a fixed humidity value and cannot accurately calculate the dew point temperature and control the equipment's operation based on the difference between the dew point temperature and the metal wall temperature. It may start the equipment before condensation conditions are met, increasing dehumidification power consumption. In addition, this method is inefficient in low-temperature environments, and improper dehumidification power control can lead to the risk of icing in the cooler, significantly reducing dehumidification efficiency. Therefore, existing technologies suffer from inaccurate dehumidification control, high energy consumption, low efficiency, and the potential for secondary problems.

[0004] Prior art document 1 (CN119472832A) discloses a thermal management control method for an energy storage container, including acquiring internal air temperature and humidity data of the energy storage container; calculating the dew point temperature inside the container based on the internal air temperature and humidity data; acquiring equipment surface temperature data inside the energy storage container and comparing the equipment surface temperature data with the dew point temperature to determine whether the equipment surface temperature inside the energy storage container is lower than the dew point temperature; if the equipment surface temperature inside the energy storage container is lower than the dew point temperature, the equipment surface inside the energy storage container acts as the condensation surface of the air inside the energy storage container, and a dehumidification and heating control command is sent to dehumidify the air inside the energy storage container and heat the equipment inside the energy storage container. However, this patent has shortcomings such as poor accuracy and high energy consumption. Specifically: 1. The dehumidification logic is indirect and does not directly address the essence of condensation, resulting in insufficient accuracy. The core condition for condensation is that "the equipment surface temperature is lower than the dew point temperature." Technical document 1 completely ignores the crucial physical parameter of "equipment wall temperature," relying solely on indirect judgments based on "fitting similarity and dew point temperature inferred from temperature and humidity data" to control the heating device. This has a significant logical flaw. Fitting similarity is the degree of matching between "calibrated temperature and humidity" and "measured and controlled temperature and humidity," essentially verifying the consistency of sensor data rather than assessing condensation risk, and has a weak relevance to the core dehumidification requirement. Relying solely on "dew point temperature and fitting similarity" cannot accurately identify "whether condensation will form on the equipment surface," easily leading to misjudgments such as "not starting when dehumidification is needed and starting arbitrarily when dehumidification is not required." 2. The heating device only supports "start / stop control" and lacks dynamic power adjustment functionality. The heating device starts at full capacity as long as the similarity of the fit is within the range of "dew point temperature ± first preset temperature"; it stops directly when the temperature rises beyond the range of "dew point temperature ± second preset temperature", making it impossible to adjust the heating intensity according to the condensation risk level. This "full load operation or shutdown" mode leads to energy waste in low-risk scenarios (e.g., requiring full heating even with only a slight condensation risk) and does not meet energy-saving requirements. 3. The algorithm relies excessively on complex algorithms without bringing about actual performance improvements, instead increasing the threshold for implementation. It involves multiple complex concepts such as "fuzzy reasoning, fuzzy sets, membership functions, non-membership functions, and trend functions", and also needs to meet multiple conditions such as normalization verification. The formulas are cumbersome, the algorithm debugging is difficult, and professional technicians are required to calibrate fuzzy set parameters and fitting intervals.

[0005] Prior art document 2 (CN116700381A) discloses a method, device, equipment, and medium for dehumidifying power equipment. This includes acquiring temperature and humidity sensor data; processing the temperature and humidity sensor data using a multi-sensor data fusion and following control algorithm to obtain a fitting similarity; processing the temperature and humidity sensor data using an environmental dew point algorithm to obtain the dew point temperature; and generating control commands based on the dew point temperature and the fitting similarity to control the operation of the heating device. However, this patent has shortcomings such as high risk of misjudgment and high energy consumption. Specifically: 1. Temperature in low-temperature areas is "estimated" instead of "actually measured," resulting in insufficient accuracy in risk assessment. 1. Without deploying sensors in the low-temperature region, the temperature range of the low-temperature region is inferred only by "high-temperature region temperature + ambient temperature + temperature distribution model". The inference results are greatly affected by the accuracy of the model and the representativeness of historical data, and have inherent errors, which may lead to misjudgment of risks; 2. Like the existing technical document 1, the heating device only supports "start and stop control" and has no dynamic power adjustment function; 3. Relying on the "cloud + distributed controller" architecture, it is necessary to deploy infrared thermal imagers to collect historical data, build a temperature distribution model through density clustering, and obtain future ambient temperature prediction values. The hardware cost and network deployment cost are high, but no actual improvement is brought about. Summary of the Invention

[0006] To address the shortcomings of existing technologies, such as difficulty in implementation, high energy consumption, low dehumidification efficiency, and high risk of misjudgment, this invention provides an automatic dehumidification method and system for switchgear.

[0007] The present invention adopts the following technical solution.

[0008] This invention discloses an automatic dehumidification method for switchgear, comprising: Step 1: Collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature; Step 2: Based on the air temperature and relative humidity collected in Step 1, calculate the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet; Step 3: Determine the operating power of the dehumidification device based on the metal wall temperature, air temperature, and the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. Step 4: Run the dehumidifier at the preset dehumidification time interval according to the dehumidifier operating power determined in Step 3, and then repeat Steps 1 to 3.

[0009] More preferably, In step 2, the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet is calculated based on preset temperature coefficient, first humidity coefficient, temperature-humidity composite coefficient, second humidity coefficient, reference temperature, reference relative humidity, and fixed constant, as shown in the following formula: = (1) in, This indicates the current air temperature inside the switchgear. This indicates the current relative humidity of the air inside the switchgear. This indicates the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. It is a fixed constant; Temperature coefficient; The first humidity coefficient; The temperature-humidity composite coefficient; The second humidity coefficient; For reference temperature; Reference relative humidity.

[0010] More preferably, In step 2, when the relative humidity of the air is detected to be 100%, the air temperature is directly set to be equal to the dew point temperature.

[0011] More preferably, In step 3, determining the dehumidification device's operating power based on the metal wall temperature, air temperature, and the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet includes: When the working power setting conditions of the first dehumidifier are met, the working power of the dehumidifier is set to the rated power of the dehumidifier. When the operating power setting conditions of the first dehumidifier are not met, the output power coefficient of the dehumidifier is determined based on the metal wall temperature, air temperature, dew point temperature, and the preset output power coefficient curve of the dehumidifier; the operating power of the dehumidifier is obtained by multiplying the output power coefficient of the dehumidifier by the rated power of the dehumidifier.

[0012] More preferably, The operating power setting condition for the first dehumidification device is that the metal wall temperature equals the air temperature and the dew point temperature.

[0013] More preferably, The output power coefficient curve of the dehumidifier is set to 1 when the metal wall temperature is less than or equal to the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet; when the metal wall temperature is greater than the dew point temperature but less than the air temperature, the output power coefficient of the dehumidifier is calculated based on the metal wall temperature and the dew point temperature; when the wall temperature is greater than or equal to the air temperature, the output power coefficient of the dehumidifier is set to zero.

[0014] Another aspect of the present invention discloses an automatic dehumidification system for switchgear based on an automatic dehumidification method, including a dehumidification-related data acquisition module, a dew point temperature calculation module, a dehumidification device operating power determination module, and a periodic dehumidification execution module: The dehumidification-related data acquisition module is used to collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature. The dew point temperature calculation module calculates the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet based on the air temperature and relative humidity collected by the dehumidification related data acquisition module. The dehumidification device operating power determination module determines the dehumidification device operating power based on the metal wall temperature, air temperature, and the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. The cycle dehumidification execution module is used to enable the dehumidification device to run at a preset dehumidification time interval according to the dehumidification device working power determined by the dehumidification device working power determination module, and then re-execute the dehumidification related data acquisition module, dew point temperature calculation module, and dehumidification device working power determination module in sequence.

[0015] More preferably, The dehumidifier operating power determination module includes a first dehumidifier operating power setting unit and a second dehumidifier operating power setting unit. The first dehumidifier operating power setting unit is used to set the dehumidifier operating power to the rated power of the dehumidifier when the first dehumidifier operating power setting conditions are met. The second dehumidifier operating power setting unit is used to determine the dehumidifier output power coefficient based on the metal wall temperature, air temperature, dew point temperature, and a preset dehumidifier output power coefficient curve when the first dehumidifier operating power setting conditions are not met; and to obtain the dehumidifier operating power by multiplying the dehumidifier output power coefficient by the rated power of the dehumidifier.

[0016] Another aspect of this application discloses an electronic device, including a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the aforementioned automatic dehumidification method for switchgear.

[0017] This application also discloses a computer-readable storage medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements the automatic dehumidification method for the switch cabinet.

[0018] The beneficial effects of this invention are compared with those of the prior art: 1. This invention directly deploys wall temperature sensors to collect real-time metal wall temperatures at key locations such as the top of the cabinet and partitions. It combines dew point temperature and air temperature to construct a triple comparison logic, directly assessing the risk of condensation based on the core condition that "the wall temperature is lower than the dew point temperature," without any speculative errors. This invention's automatic dehumidification method for switch cabinets accurately assesses condensation risk by calculating the dew point temperature in real time and dynamically comparing it with the metal wall temperature, avoiding the blindness of traditional methods and improving dehumidification efficiency.

[0019] 2. By introducing the output power coefficient curve of the segmented dehumidifier, especially by adopting an exponential decay power reduction mode in the low-to-medium risk range, the dehumidifier operates at high power only when necessary and is in low power consumption or standby mode most of the time, which reduces the overall energy consumption of the system and achieves "precise matching between risk level and dehumidification power".

[0020] 3. The hardware of this invention only requires two types of sensors: an air temperature and humidity sensor and a wall temperature sensor. It can operate with a microprocessor and a power control unit without relying on a cloud server or complex data clustering modeling. The algorithm logic is clear, and the programming, debugging and maintenance are easy.

[0021] 4. This invention operates in a fixed cycle, continuously tracking changes in the internal environment of the switchgear (such as temperature rise caused by weather changes and load changes), and automatically adjusting the dehumidification strategy, exhibiting excellent environmental adaptability. The method is easily implemented through microprocessor programming, resulting in a simple system structure, high reliability, and effective prevention of equipment failures caused by condensation, thereby improving the safety and lifespan of the switchgear.

[0022] This invention also has outstanding advantages such as ease of implementation, low energy consumption, high dehumidification efficiency, and low risk of misjudgment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the basic process of the method in an embodiment of the present invention; Figure 2 This is a schematic diagram of the quadratic function fitting surface of dew point temperature with air temperature and relative humidity in an embodiment of the present invention. Figure 3 This is a schematic diagram of the working power curve of the dehumidification device in an embodiment of the present invention.

[0024] Figure 4 This is a schematic block diagram of the automatic dehumidification system for switchgear according to an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0026] This application discloses an automatic dehumidification method for switchgear, including: Step 1: Collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature; Step 2: Based on the air temperature and relative humidity collected in Step 1, calculate the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet; The current internal air temperature and dew point temperature corresponding to the relative humidity of the air in the switch cabinet are calculated based on preset temperature coefficient, first humidity coefficient, temperature-humidity composite coefficient, second humidity coefficient, reference temperature, reference relative humidity, and fixed constant, as shown in the following formula: = (1) in, This indicates the current air temperature inside the switchgear. This indicates the current relative humidity of the air inside the switchgear. This indicates the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. It is a fixed constant, and its preferred value is -0.8253; The temperature coefficient is preferably 0.4397. The first humidity coefficient is preferably 0.8181. The temperature-humidity composite coefficient is preferably taken as 0.09563; The second humidity coefficient is preferably 2.243 × ; For reference temperature, its preferred value is 25℃; For reference relative humidity, the preferred value is 50%RH.

[0027] When the relative humidity of the air is detected to be 100%, the air temperature is directly set to be equal to the dew point temperature.

[0028] Step 3: Determine the operating power of the dehumidifier based on the metal wall temperature, air temperature, and dew point temperature; The operating power of the dehumidifier is determined based on the metal wall temperature, air temperature, and dew point temperature, including: When the operating power setting conditions of the first dehumidifier are met, the operating power of the dehumidifier is set to the rated power of the dehumidifier; the operating power setting conditions of the first dehumidifier refer to the metal wall temperature being equal to the air temperature being equal to the dew point temperature.

[0029] When the operating power setting conditions of the first dehumidifier are not met, the output power coefficient of the dehumidifier is determined based on the metal wall temperature, air temperature, dew point temperature, and a preset dehumidifier output power coefficient curve. The dehumidifier's operating power is obtained by multiplying its output power coefficient by its rated power. The dehumidifier output power coefficient curve specifies that when the metal wall temperature is less than or equal to the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet, the dehumidifier output power coefficient is set to 1; when the metal wall temperature is greater than the dew point temperature but less than the air temperature, the dehumidifier output power coefficient is calculated based on the metal wall temperature and dew point temperature; and when the wall temperature is greater than or equal to the air temperature, the dehumidifier output power coefficient is set to zero, as shown in the following formula: (2) In the formula: p f This refers to the output power coefficient of the dehumidifier; T w This refers to the temperature of the metal wall surface.

[0030] Step 4: Run the dehumidifier at the preset dehumidification time interval according to the dehumidifier operating power determined in Step 3, and then repeat Steps 1 to 3. The preferred value for the dehumidification time interval is 30 minutes.

[0031] This application also discloses an automatic dehumidification system for switchgear based on an automatic dehumidification method, including a dehumidification-related data acquisition module, a dew point temperature calculation module, a dehumidification device operating power determination module, and a periodic dehumidification execution module: The dehumidification-related data acquisition module is used to collect dehumidification-related data inside the switchgear; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature; the dehumidification device operating power determination module includes a first dehumidification device operating power setting unit and a second dehumidification device operating power setting unit. The first dehumidifier operating power setting unit is used to set the dehumidifier operating power to the rated power of the dehumidifier when the first dehumidifier operating power setting conditions are met. The second dehumidifier operating power setting unit is used to determine the dehumidifier output power coefficient based on the metal wall temperature, air temperature, dew point temperature, and a preset dehumidifier output power coefficient curve when the first dehumidifier operating power setting conditions are not met; and to obtain the dehumidifier operating power by multiplying the dehumidifier output power coefficient by the rated power of the dehumidifier.

[0032] The dew point temperature calculation module calculates the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet based on the air temperature and relative humidity collected by the dehumidification related data acquisition module. The dehumidification device operating power determination module determines the dehumidification device operating power based on the metal wall temperature, air temperature, and the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. The cycle dehumidification execution module is used to enable the dehumidification device to run at a preset dehumidification time interval according to the dehumidification device working power determined by the dehumidification device working power determination module, and then re-execute the dehumidification related data acquisition module, dew point temperature calculation module, and dehumidification device working power determination module in sequence.

[0033] Example 1 like Figure 1 As shown, the steps of an automatic dehumidification method for a switchgear in this embodiment include: Step 1: Collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature; To achieve accurate temperature and humidity detection inside the switchgear and prevent inaccurate start-stop issues caused by sensor measurement errors, step 1) utilizes a temperature sensor with an accuracy of ±0.1℃ and a humidity sensor with an accuracy of ±0.5%RH to collect air temperature and humidity data from areas with significant electrical contact heating and large spaces, such as the switchgear busbar compartment and cable compartment, as well as the temperature of the metal walls of the cabinet top or partitions. The collected temperature range covers -5℃ to 50℃, and the humidity range covers 30%RH to 95%RH, to cover the possible temperature and humidity environment inside the switchgear.

[0034] Step 2: Based on the air temperature and relative humidity, calculate the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet; The dew point temperature corresponding to the current internal air temperature and relative humidity of the switchgear is calculated using the following formula: = (1) In the formula, This indicates the current air temperature inside the switchgear. This indicates the current relative humidity of the air inside the switchgear. Indicates the current internal air temperature of the switchgear. relative humidity Corresponding dew point temperature , It is a fixed constant, and its preferred value is -0.8253; The temperature coefficient is preferably 0.4397. The first humidity coefficient is preferably 0.8181. The temperature-humidity composite coefficient is preferably taken as 0.09563; The second humidity coefficient is preferably 2.243 × ; =25℃, which is the reference temperature; =50%RH, which is the reference relative humidity.

[0035] The core purpose of the dew point temperature calculation formula for the current internal air temperature and relative humidity of the switch cabinet in this invention is to quickly and accurately calculate the dew point in engineering application scenarios (temperature -5℃~50℃, humidity 30%RH~95%RH), rather than covering all extreme theoretical conditions (such as relative humidity 100%). Therefore, when the relative humidity of the air is detected to be 100%, the air temperature is directly set to be equal to the dew point temperature.

[0036] The surfaces corresponding to the above functions are as follows: Figure 2 As shown. The above functions can be used to calculate the dew point temperature corresponding to any air temperature and humidity, overcoming the problem that traditional methods can only set a fixed humidity action and cannot accurately calculate the dew point temperature. Based on the above functional relationship, the dew point temperature corresponding to the current internal air temperature and humidity of the switchgear is calculated. In this embodiment, the current internal air temperature of the switchgear is 27℃, the relative humidity is 80%RH, and the corresponding dew point temperature is 23.2℃.

[0037] Step 3: Determine the operating power of the dehumidifier based on the metal wall temperature, air temperature, and dew point temperature.

[0038] When the operating power setting conditions of the first dehumidifier are met, the operating power of the dehumidifier is set to the rated power of the dehumidifier; the operating power setting conditions of the first dehumidifier refer to the metal wall temperature being equal to the air temperature being equal to the dew point temperature.

[0039] When the operating power setting conditions of the first dehumidifier are not met, in order to control the output power of the dehumidifier based on the difference between the metal wall temperature of the switch cabinet and the dew point temperature, the output power coefficient curve of the dehumidifier in step 3 is a piecewise function curve, as shown in equation (2) and Figure 3 As shown.

[0040] (2) In the formula:p f This refers to the output power coefficient of the dehumidifier; T w This refers to the temperature of the metal wall surface.

[0041] When the metal wall temperature is less than or equal to the dew point temperature, the dehumidifier's output power coefficient is 1, and the dehumidifier operates at its rated power. When the metal wall temperature is greater than the dew point temperature but less than the air temperature, the dehumidifier's output power coefficient is calculated based on these temperatures. In this case, the formula for calculating the dehumidifier's output power coefficient is a monotonically decreasing exponential function, and the calculated output power coefficient is between 0 and 1. The dehumidifier operates at reduced power, and its operating power is equal to the product of its output power coefficient and its rated power P0. When the wall temperature is greater than or equal to the air temperature, the dehumidifier's output power coefficient is set to zero, and the dehumidifier does not operate. The output power curve of the dehumidifier is constructed based on the product of different dehumidifier output power coefficients and their corresponding rated power.

[0042] This invention does not require additional consideration of switch cabinet size, dehumidifier type, and rated power in equation (2). The formula uniformly calculates the power coefficient, which is essentially based on the dehumidifier output power coefficient (between 0 and 1) to describe the proportion of dehumidification intensity corresponding to the current condensation risk. For different switch cabinets, those skilled in the art can select the corresponding rated power dehumidifier according to its capacity, that is, large-volume switch cabinets are matched with high rated power dehumidifiers, and small-volume switch cabinets are matched with low rated power devices. The coefficient of equation (2) only needs to control "how much rated power is currently used", without intervening in the selection process.

[0043] Step 4: Repeat the above steps at preset dehumidification time intervals.

[0044] In this embodiment, the dehumidification time interval of the dehumidification device in step 4 is 30 minutes. After 30 minutes, the dehumidification device repeats steps 1 to 4 to ensure that the switch cabinet dehumidification system operates according to the new air temperature, humidity and metal wall temperature.

[0045] Example 2 An automatic dehumidification method for switch cabinets.

[0046] Step 1: Collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature; The current internal air temperature of the switchgear is 27℃, and the relative humidity is 80%RH. The temperature of the metal wall inside the switchgear is also measured. T w =22℃.

[0047] Step 2: Based on the air temperature and relative humidity collected in Step 1, calculate the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet; According to the calculation formula for the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet proposed in this invention, the dew point temperature is calculated to be 23.2℃.

[0048] Step 3: Determine the operating power of the dehumidifier based on the metal wall temperature, air temperature, and dew point temperature; Due to the temperature of the metal wall surface T w Less than dew point temperature T d =23.2℃, the output power coefficient of the dehumidifier is determined to be 1.

[0049] Step 4: Run the dehumidifier at the preset dehumidification time interval according to the dehumidifier operating power determined in Step 3, and then repeat Steps 1 to 3. In this embodiment, the dehumidification time interval is 30 minutes.

[0050] The dehumidifier operates at its rated power for 30 minutes. After 30 minutes, the internal air temperature, humidity, and metal wall temperature of the switchgear are measured. Based on the dew point temperature corresponding to the current internal air temperature and relative humidity, a new output power coefficient for the dehumidifier is determined, and the operating power of the dehumidifier is then determined. The dehumidifier operates at the new operating power for 30 minutes, and this process is repeated.

[0051] Example 3 An automatic dehumidification system for switchgear is provided to implement the above method.

[0052] An automatic dehumidification system for switchgear includes a dehumidification-related data acquisition module, a dew point temperature calculation module, a dehumidification device operating power determination module, and a periodic dehumidification execution module; like Figure 4 As shown, the dehumidification-related data acquisition module in this system includes an air temperature and humidity sensor and a wall temperature sensor connected to each other, used to collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature, and the collected data is transmitted to the dew point temperature calculation module; the air temperature and humidity sensor and the wall temperature sensor are connected to the microprocessor, used to collect the air temperature, relative humidity, and metal wall temperature inside the switch cabinet in real time.

[0053] The dew point temperature calculation module, the dehumidification device working power determination module, and the cycle dehumidification execution module are all located in the microprocessor; The dew point temperature calculation module calculates the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet based on the air temperature and relative humidity collected by the dehumidification related data acquisition module. The dehumidifier operating power determination module determines the dehumidifier operating power based on the metal wall temperature, air temperature, and dew point temperature. The cycle dehumidification execution module is used to sequentially execute the dehumidification-related data acquisition module, the dew point temperature calculation module, and the dehumidification device working power determination module at preset dehumidification time intervals.

[0054] like Figure 4 As shown, the automatic dehumidification system for switchgear of the present invention also includes a power supply unit, a power control unit, and a dehumidification unit.

[0055] The power supply unit provides a stable power supply for the entire automatic dehumidification system of the switchgear.

[0056] The power control unit is connected to the microprocessor and is used to receive power control commands from the periodic dehumidification execution module in the microprocessor, and output the corresponding power accurately according to the command requirements.

[0057] The dehumidification unit is connected to the power control unit, and its operating status and power are driven by the power control unit to achieve the moisture-proof and dehumidification effect of the switch cabinet. The microprocessor is pre-programmed or configured to execute the functions of the dew point temperature calculation module, the dehumidification device operating power determination module, and the periodic dehumidification execution module.

[0058] In this embodiment, the air temperature and humidity sensor and the wall temperature sensor transmit temperature and humidity data to the microprocessor interface via a 485 interface. The microprocessor executes the embedded dew point temperature and power coefficient calculation algorithm to calculate the required dehumidification power. Then, it controls the output of the MOSFET power control circuit through a PWM signal, thereby driving the semiconductor refrigeration dehumidification unit to operate at the specified power. The entire system operates in a closed loop, realizing intelligent, efficient, and energy-saving control of the humidity inside the switch cabinet.

[0059] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0060] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0061] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0062] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. An automatic dehumidification method for switchgear, characterized in that, include: Step 1: Collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature; Step 2: Based on the air temperature and relative humidity collected in Step 1, calculate the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet; Step 3: Determine the operating power of the dehumidification device based on the metal wall temperature, air temperature, and the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. Step 4: Run the dehumidifier at the preset dehumidification time interval according to the dehumidifier operating power determined in Step 3, and then repeat Steps 1 to 3.

2. The automatic dehumidification method for switchgear according to claim 1, characterized in that: In step 2, the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet is calculated based on preset temperature coefficient, first humidity coefficient, temperature-humidity composite coefficient, second humidity coefficient, reference temperature, reference relative humidity, and fixed constant, as shown in the following formula: = (1) in, This indicates the current air temperature inside the switchgear. This indicates the current relative humidity of the air inside the switchgear. This indicates the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. It is a fixed constant; Temperature coefficient; The first humidity coefficient; The temperature-humidity composite coefficient; The second humidity coefficient; For reference temperature; Reference relative humidity.

3. The automatic dehumidification method for switchgear according to claim 1 or 2, characterized in that: In step 2, when the relative humidity of the air is detected to be 100%, the air temperature is directly set to be equal to the dew point temperature.

4. The automatic dehumidification method for switchgear according to claim 1, characterized in that: In step 3, determining the dehumidification device's operating power based on the metal wall temperature, air temperature, and the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet includes: When the working power setting conditions of the first dehumidifier are met, the working power of the dehumidifier is set to the rated power of the dehumidifier. When the operating power setting conditions of the first dehumidifier are not met, the output power coefficient of the dehumidifier is determined based on the metal wall temperature, air temperature, dew point temperature, and the preset output power coefficient curve of the dehumidifier; the operating power of the dehumidifier is obtained by multiplying the output power coefficient of the dehumidifier by the rated power of the dehumidifier.

5. The automatic dehumidification method for switchgear according to claim 4, characterized in that: The operating power setting condition for the first dehumidification device is that the metal wall temperature equals the air temperature and the dew point temperature.

6. The automatic dehumidification method for switchgear according to claim 4, characterized in that: The output power coefficient curve of the dehumidifier is set to 1 when the metal wall temperature is less than or equal to the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet; when the metal wall temperature is greater than the dew point temperature but less than the air temperature, the output power coefficient of the dehumidifier is calculated based on the metal wall temperature and the dew point temperature; when the wall temperature is greater than or equal to the air temperature, the output power coefficient of the dehumidifier is set to zero.

7. An automatic dehumidification system for switchgear utilizing the automatic dehumidification method for switchgear according to any one of claims 1-6, characterized in that, It includes a dehumidification-related data acquisition module, a dew point temperature calculation module, a dehumidification device operating power determination module, and a periodic dehumidification execution module. The dehumidification-related data acquisition module is used to collect dehumidification-related data inside the switch cabinet; the dehumidification-related data includes air temperature, relative humidity, and metal wall temperature. The dew point temperature calculation module calculates the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet based on the air temperature and relative humidity collected by the dehumidification related data acquisition module. The dehumidification device operating power determination module determines the dehumidification device operating power based on the metal wall temperature, air temperature, and the dew point temperature corresponding to the current internal air temperature and relative humidity of the switch cabinet. The cycle dehumidification execution module is used to enable the dehumidification device to run at a preset dehumidification time interval according to the dehumidification device working power determined by the dehumidification device working power determination module, and then re-execute the dehumidification related data acquisition module, dew point temperature calculation module, and dehumidification device working power determination module in sequence.

8. The automatic dehumidification system for switchgear according to claim 7, characterized in that: The dehumidifier operating power determination module includes a first dehumidifier operating power setting unit and a second dehumidifier operating power setting unit. The first dehumidifier operating power setting unit is used to set the dehumidifier operating power to the rated power of the dehumidifier when the first dehumidifier operating power setting conditions are met. The second dehumidifier operating power setting unit is used to determine the dehumidifier output power coefficient based on the metal wall temperature, air temperature, dew point temperature, and a preset dehumidifier output power coefficient curve when the first dehumidifier operating power setting conditions are not met; and to obtain the dehumidifier operating power by multiplying the dehumidifier output power coefficient by the rated power of the dehumidifier.

9. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the automatic dehumidification method for switch cabinets according to any one of claims 1-6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the automatic dehumidification method for switch cabinets as described in any one of claims 1-6.

Images