A kind of box-type substation and power cabinet moisture-proof and condensation method and device

Abstract

The application relates to the technical field of moisture-proof and condensation-proof inside box-type substations and power cabinets, and discloses a moisture-proof and condensation-proof method and device for box-type substations and power cabinets.Compared with the prior art, the moisture-proof and condensation-proof method is used to control the temperature and humidity inside the box-type substations and power cabinets within a set range, so that the moisture-proof and condensation-proof inside the box-type substations and power cabinets are realized, and the problem that various components in the existing box-type substations and power cabinets are prone to moisture and rust due to poor moisture control and condensation-proof effect, thereby causing risks of electrical equipment during operation are solved.

Description

Technical Field

[0001] This invention relates to the field of moisture-proofing and anti-condensation technology for prefabricated substations and power cabinets, specifically to a method and device for moisture-proofing and anti-condensation of prefabricated substations and power cabinets. Background Technology

[0002] The internal environment of electrical equipment and mechanisms within prefabricated substations and power cabinets (outdoor prefabricated substations, ring main units, high and low voltage switchgear, electrical control cabinets, terminal boxes, etc.) is affected by external climate, internal structure, sealing conditions, and other factors. Among these, ambient temperature and humidity are crucial factors affecting the normal operation of electrical equipment. Excessive humidity causes moisture condensation on equipment surfaces, leading to mold growth or accelerated electrochemical reactions, reducing electrical insulation strength and increasing contact resistance. Once electrical equipment mechanisms become damp and corroded, or contact resistance increases, even a small fault can cause widespread production stoppages, resulting in power outages in a certain area.

[0003] Ensuring the efficient and safe operation of production equipment is of paramount importance. After a period of operation, equipment can develop various problems due to excessive humidity. Because the effects of humidity are a slow process, these problems are often not addressed promptly, and repairs are only undertaken when the equipment becomes completely inoperable. This increases the difficulty and intensity of repairs, impacts production, raises maintenance costs, and may even lead to serious safety accidents. Therefore, ensuring that electrical equipment operates within a reasonable temperature and humidity environment is crucial.

[0004] Especially in southern regions, the humidity inside switchgear is sometimes high, making condensation easy to occur. Currently, most outdoor power cabinets both domestically and internationally use household or civilian dehumidifiers that primarily employ technologies such as adsorption (absorption) dehumidification, cooling dehumidification, and heating dehumidification. While heating and cooling can decompose the surrounding localized humid air, the moisture remains inside the power cabinet. This doesn't remove the moisture or eliminate the conditions that cause condensation. Furthermore, the lack of proper internal airflow within the power cabinet makes the electrical equipment more susceptible to moisture and condensation, which is detrimental to the safe operation of the equipment and fails to fundamentally reduce the internal humidity and improve condensation. This poses a threat to the safety of the power cabinet's switching equipment. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and device for preventing moisture and condensation in prefabricated substations and power cabinets, in view of the above-mentioned defects in the prior art. The aim is to solve the problem that the components in the existing prefabricated substations and power cabinets are prone to moisture and rust due to poor moisture control and condensation prevention, which leads to risks in the operation of electrical equipment.

[0006] This invention is implemented as follows: This invention provides a method for preventing moisture and condensation in a prefabricated substation and power cabinet, characterized in that the method includes the following steps:

[0007] S1: The relative humidity (RH) is read by a humidity sensor installed in the prefabricated substation and the power cabinet, and the condensation surface temperature is read by a condensation surface temperature sensor. Dry bulb temperature sensor reads dry bulb temperature ;

[0008] S2: Based on relative humidity (RH) and dry-bulb temperature The dew point temperature was estimated using the Magnus-Tetens approximation method. ;

[0009] S3: Based on the condensation surface temperature and dew point temperature Calculate the surface temperature of condensation. and dew point temperature The difference is:

[0010]

[0011] in, Indicates the dew point temperature difference;

[0012] if , For a pre-defined positive number and This indicates the surface temperature at which condensation occurs. Temperature close to dew point Condensation may occur inside the prefabricated substation and power cabinet.

[0013] If the relative humidity RH RH max Let RH max =80%, or Switch to air exchange circulation mode;

[0014] If the relative humidity (RH) RH max ,and Switch to temperature management mode;

[0015] The air replacement circulation mode includes the following steps:

[0016] S101: If the condensation sensor installed in the box-type substation and power cabinet detects condensation, the heater and fan in the air-heated air curtain machine are started simultaneously for 60 seconds, and then the dehumidifying air curtain machine is started, proceeding to step S102; the air-heated air curtain machine and the dehumidifying air curtain machine are installed in the box-type substation and power cabinet.

[0017] If the condensation sensor does not detect condensation, the fan in the air-heated air curtain and the dehumidifying air curtain are started simultaneously, and the process proceeds to step S103.

[0018] S102: Monitor the status of the condensation sensor in real time. Once the condensation sensor detects no condensation, stop the operation of the heater in the air-heated air curtain machine.

[0019] S103: Estimate the degree of condensation evaporation D on the inner surface of the box-type substation and power cabinet after the air-heated air curtain machine is started by using the condensation evaporation assessment algorithm;

[0020] S104: Manually selected threshold D min As the minimum value of the condensation evaporation degree D, if the condensation evaporation degree DD estimated by the aforementioned condensation evaporation assessment algorithm is... min Or the degree of condensation evaporation DD min And relative humidity RHRH max If the evaporation rate of the condensation surface inside the prefabricated substation and power cabinet is high, start the axial flow fan installed inside the prefabricated substation and power cabinet, and proceed to step S105; otherwise, shut down the air-heated air curtain machine and the dehumidifying air curtain machine.

[0021] S105: The axial flow fan draws out the humid air in the box-type substation and power cabinet, and after forming a negative pressure, it begins to effectively introduce air. The dehumidifying air curtain dehumidifies the introduced air so that the air entering the box-type substation and power cabinet has a low humidity.

[0022] S106: Based on the principle that the faster the air humidity decreases in a prefabricated substation and power cabinet, the better the dehumidification effect, estimate the dehumidification effect R;

[0023] S107: Manually selected threshold R min As the minimum value of the dehumidification effect R, if the estimated dehumidification effect RR min This indicates that the dehumidification effect inside the box-type substation and power cabinet is good, so the axial flow fan is turned off;

[0024] If the dehumidification effect is RR min And relative humidity RHRH max This indicates that the humidity inside the prefabricated substation and power cabinet is very high. Continue to run the axial flow fan until the estimated dehumidification effect RR is achieved. min Turn off the axial flow fan;

[0025] S108: When the estimated dehumidification effect R is close to R min When necessary, shut down the air-heated air curtain machine and the dehumidifying air curtain machine;

[0026] The temperature management mode includes the following steps:

[0027] S201: When the temperature detected by the temperature sensor installed in the box-type substation and power cabinet is greater than 50 degrees, the axial flow fan is started to exhaust and cool down;

[0028] S202: Let the sampling interval of the temperature sensor be T, with N sampling periods as a group, where N is the number of temperature data points used to calculate the average temperature. Then, during the sampling time... The formula for calculating the average temperature over the given time range is as follows:

[0029] ,

[0030] in: Let E represent the average temperature, and E represent the expected value. The temperature data collected by the temperature sensor at sampling intervals T, k=0,…,N; m is a time variable used to distinguish the average temperature calculated in different time periods, and N is a natural number.

[0031] Based on the aforementioned formula for calculating the average temperature, the value at sampling time t is calculated. Temperature data inside Where M is the total number of average temperatures obtained. Indicates the sampling time t The average temperature over the time period Indicates the sampling time t Average temperature over the time period Indicates the sampling time t Average temperature over a period of time;

[0032] S203: At sampling time t During the time period, for Perform linear fitting; using the least squares method, let:

[0033]

[0034] in: Indicates linear fitting of temperature average The slope of the straight line. Indicates linear fitting of temperature average The intercept of a line;

[0035] Represented in matrix form, then:

[0036]

[0037] in: , ,

[0038] Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ;

[0039] After the axial flow fan is started for exhaust cooling, the temperature inside the prefabricated substation and power cabinet shows a downward trend. ;

[0040] S204: If w is a pre-set positive number, or the axial flow fan will stop when the temperature sensor detects that the temperature inside the box-type substation and power cabinet drops to 45 degrees.

[0041] When the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is lower than the set temperature, the air-heating air curtain machine is started to raise the temperature; the air-heating air curtain machine is stopped when the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is higher than the set temperature.

[0042] The air replacement circulation mode includes the following steps:

[0043] S101: If the condensation sensor installed in the box-type substation and power cabinet detects condensation, the heater and fan in the air-heated air curtain machine are started simultaneously for 60 seconds, and then the dehumidifying air curtain machine is started, proceeding to step S102; the air-heated air curtain machine and the dehumidifying air curtain machine are installed in the box-type substation and power cabinet.

[0044] If the condensation sensor does not detect condensation, the fan in the air-heated air curtain and the dehumidifying air curtain are started simultaneously, and the process proceeds to step S103.

[0045] S102: Monitor the status of the condensation sensor in real time. Once the condensation sensor detects no condensation, stop the operation of the heater in the air-heated air curtain machine.

[0046] S103: Estimate the degree of condensation evaporation D on the inner surface of the box-type substation and power cabinet after the air-heated air curtain machine is started by using the condensation evaporation assessment algorithm;

[0047] S104: Manually selected threshold D min As the minimum value of the condensation evaporation degree D, if the condensation evaporation degree D estimated by the aforementioned condensation evaporation assessment algorithm is... D min Or the degree of condensation evaporation D D min And relative humidity (RH) RH maxIf the evaporation rate of the condensation surface inside the prefabricated substation and power cabinet is high, start the axial flow fan installed inside the prefabricated substation and power cabinet, and proceed to step S105; otherwise, shut down the air-heated air curtain machine and the dehumidifying air curtain machine.

[0048] S105: The axial flow fan draws out the humid air in the box-type substation and power cabinet, and after forming a negative pressure, it begins to effectively introduce air. The dehumidifying air curtain dehumidifies the introduced air so that the air entering the box-type substation and power cabinet has a low humidity.

[0049] S106: Based on the principle that the faster the air humidity decreases in a prefabricated substation and power cabinet, the better the dehumidification effect, estimate the dehumidification effect R;

[0050] S107: Manually selected threshold R min As the minimum value of the dehumidification effect R, if the estimated dehumidification effect R... R min This indicates that the dehumidification effect inside the box-type substation and power cabinet is good, so the axial flow fan is turned off;

[0051] If the dehumidification effect is R R min And relative humidity (RH) RH max This indicates that the humidity inside the prefabricated substation and power cabinet is very high. Continue to run the axial flow fan until the estimated dehumidification effect R is achieved. R min Turn off the axial flow fan;

[0052] S108: When the estimated dehumidification effect R is close to R min When necessary, shut down the air-heated air curtain machine and the dehumidifying air curtain machine;

[0053] The algorithm for evaluating condensation evaporation includes the following steps:

[0054] S10301: Let the sampling interval of the humidity sensor be T, with N sampling periods as a group, where N is the number of relative humidity data points used to calculate the average relative humidity. Then, during the sampling time... The formula for calculating the average relative humidity over the given time range is as follows:

[0055] ,

[0056] in: The relative humidity is the average value, and E represents the expected value. The relative humidity data collected by the humidity sensor at sampling interval T, k=0,…,N; m is the time variable used to distinguish the average relative humidity calculated for different time periods, and N is a natural number.

[0057] According to the formula for calculating the average relative humidity, the value at sampling time t is calculated. Relative humidity data Where: M is the total number of average relative humidity values ​​obtained. Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period. S10302: At sampling time t During the time period, for Perform linear fitting; using the least squares method, let:

[0058]

[0059] in: Represents linear fitting of relative humidity The slope of the straight line. Represents linear fitting of relative humidity The intercept of a line;

[0060] Represented in matrix form, then:

[0061]

[0062] in: , ,

[0063] Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ;

[0064] S10303: Assuming that the degree of condensation evaporation D is related to the relative humidity RH and the rate of change of the relative humidity RH, the estimation function for the degree of condensation evaporation is established as follows:

[0065] ,

[0066] in: , , These are undetermined coefficients that are greater than zero;

[0067] The condensation evaporation estimation function characterizes the evaporation rate at sampling time t. The degree of reduction in condensation within a time range during the time period, wherein the condensation evaporation estimation function is related to the sampling time t. Average relative humidity over the last period The slope of the linear fit with relative humidity Relevant, therefore and The larger the relative humidity, the greater the degree of condensation evaporation, D. Therefore, the degree of condensation evaporation, D, is related to the average relative humidity. and Positive correlation;

[0068] S10304: Select duration as For the given time period, calculate the average relative humidity according to steps S10301~S10303. and Based on the changes in condensation in the prefabricated substation and power cabinet, the value of the degree of condensation evaporation D is manually selected;

[0069] S10305: Repeat step S10304 to independently calculate multiple average relative humidity values ​​at different time periods. and The value, and the average relative humidity for different values. and The value corresponds to the value of different manually selected condensation evaporation degree D; then, by using the least squares method for linear fitting, the condensation evaporation degree estimation function can be obtained. , , The value;

[0070] S10306: Based on the obtained , , The value of the calculated average relative humidity. and Substituting the value into the condensation evaporation degree estimation function, the value of condensation evaporation degree D is obtained.

[0071] The present invention also includes an apparatus for implementing the moisture-proof and anti-condensation method for a prefabricated substation and power cabinet as described above. The apparatus includes a main control module (130), a dehumidifying air curtain machine (140), an air-heating air curtain machine (150), an axial flow fan (160), a humidity sensor (120), a condensation surface temperature sensor (121), a dry bulb temperature sensor (122), a condensation sensor (123), and a temperature sensor (124).

[0072] The main control module (130) is electrically connected to the dehumidifying air curtain (140), the air-heating air curtain (150), the axial flow fan (160), the humidity sensor (120), the condensation surface temperature sensor (121), the dry bulb temperature sensor (122), the condensation sensor (123), and the temperature sensor (124), respectively.

[0073] Humidity sensor (120) is used to collect the relative humidity inside the box-type substation and power cabinet; condensation surface temperature sensor (121) is used to collect the condensation surface temperature inside the box-type substation and power cabinet; dry bulb temperature sensor (122) is used to collect the dry bulb temperature inside the box-type substation and power cabinet; condensation sensor (123) is used to detect condensation inside the box-type substation and power cabinet; and temperature sensor (124) is used to collect the temperature inside the box-type substation and power cabinet.

[0074] The dehumidifying air curtain (140) is used to condense and dehumidify the air intake of the box-type substation and power cabinet to form relatively dry air;

[0075] The air-heated air curtain machine (150) is used to heat the air inside the box-type substation and power cabinet to remove moisture from the box-type substation and power cabinet.

[0076] Axial flow fan (160) is used to exhaust hot and humid air inside the box-type substation and power cabinet to the outside of the box-type substation and power cabinet;

[0077] The main control module (130) is an embedded main control device used to receive data collected by the humidity sensor (120), the condensation surface temperature sensor (121), the dry bulb temperature sensor (122), the condensation sensor (123), and the temperature sensor (124), and to execute the moisture-proof and anti-condensation method for a box-type substation and power cabinet as described in claim 1, and to control the start and stop of the dehumidifying air curtain machine (140), the air-heating air curtain machine (150), and the axial flow fan (160).

[0078] Furthermore, the humidity sensor (120), dry bulb temperature sensor (122), and temperature sensor (124) are installed in relatively deep positions inside the box-type substation and power cabinet, the condensation surface temperature sensor (121) is installed in a position inside the box-type substation and power cabinet where condensation is likely to occur, and the condensation sensor (123) is installed in a position inside the box-type substation and power cabinet where condensation is likely to occur.

[0079] Furthermore, the main control module (130), dehumidifying air curtain (140), air-heating air curtain (150), axial flow fan (160), humidity sensor (120), condensation surface temperature sensor (121), dry bulb temperature sensor (122), condensation sensor (123), and temperature sensor (124) are installed separately and are connected electrically to form an integrated device.

[0080] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a method and device for preventing moisture and condensation inside a prefabricated substation and power cabinet. Compared with the prior art, the present invention controls the temperature and humidity inside the prefabricated substation and power cabinet within a set range through the method for preventing moisture and condensation, thereby achieving moisture and condensation prevention inside the prefabricated substation and power cabinet. This solves the problem that the components inside the existing prefabricated substation and power cabinet are prone to moisture and rust due to poor moisture control and condensation prevention, which leads to risks in the operation of electrical equipment. Attached Figure Description

[0081] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0082] Figure 1 This is a schematic flowchart of a moisture-proof and condensation-proof method for a prefabricated substation and power cabinet provided in an embodiment of the present invention.

[0083] Figure 2 This is a schematic diagram of a device provided in an embodiment of the present invention.

[0084] Figure 3 This is a schematic diagram of the main control module of a device provided in an embodiment of the present invention.

[0085] Figure 4 This is a schematic diagram of the dehumidifying air curtain unit provided in an embodiment of the present invention.

[0086] Figure 5 This is a schematic diagram of the air-heated air curtain unit provided in an embodiment of the present invention. Detailed Implementation

[0087] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0088] In the accompanying drawings of the embodiments, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element. It should be understood that if terms such as "upper," "lower," "left," and "right" indicate orientation or positional relationships based on the orientation or positional relationships 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, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0089] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0090] Example 1:

[0091] This invention provides a method for preventing moisture and condensation in a prefabricated substation and power cabinet, referring to... Figure 1 The moisture-proof and condensation-proof method includes the following steps:

[0092] S1: The relative humidity (RH) is read by a humidity sensor installed in the prefabricated substation and the power cabinet, and the condensation surface temperature is read by a condensation surface temperature sensor. Dry bulb temperature sensor reads dry bulb temperature ;

[0093] S2: Based on relative humidity (RH) and dry-bulb temperature The dew point temperature was estimated using the Magnus-Tetens approximation method. ;

[0094] S3: Based on the condensation surface temperature and dew point temperature Calculate the surface temperature of condensation. and dew point temperature The difference is:

[0095]

[0096] in, Indicates the dew point temperature difference;

[0097] if , For a pre-defined positive number and This indicates the surface temperature at which condensation occurs. Temperature close to dew point Condensation may occur inside the prefabricated substation and power cabinet.

[0098] If the relative humidity (RH) RH max Let RH max =80%, or Switch to air exchange circulation mode;

[0099] If the relative humidity (RH) RH max ,and Switch to temperature management mode;

[0100] The air replacement circulation mode includes the following steps:

[0101] S101: If the condensation sensor installed in the box-type substation and power cabinet detects condensation, the heater and fan in the air-heated air curtain machine are started simultaneously for 60 seconds, and then the dehumidifying air curtain machine is started, proceeding to step S102; the air-heated air curtain machine and the dehumidifying air curtain machine are installed in the box-type substation and power cabinet.

[0102] If the condensation sensor does not detect condensation, the fan in the air-heated air curtain and the dehumidifying air curtain are started simultaneously, and the process proceeds to step S103.

[0103] S102: Monitor the status of the condensation sensor in real time. Once the condensation sensor detects no condensation, stop the operation of the heater in the air-heated air curtain machine.

[0104] S103: Estimate the degree of condensation evaporation D on the inner surface of the box-type substation and power cabinet after the air-heated air curtain machine is started by using the condensation evaporation assessment algorithm;

[0105] S104: Manually selected threshold D min As the minimum value of the condensation evaporation degree D, if the condensation evaporation degree DD estimated by the aforementioned condensation evaporation assessment algorithm is... min Or the degree of condensation evaporation DD min And relative humidity RHRH max If the evaporation rate of the condensation surface inside the prefabricated substation and power cabinet is high, start the axial flow fan installed inside the prefabricated substation and power cabinet, and proceed to step S105; otherwise, shut down the air-heated air curtain machine and the dehumidifying air curtain machine.

[0106] S105: The axial flow fan draws out the humid air in the box-type substation and power cabinet, and after forming a negative pressure, it begins to effectively introduce air. The dehumidifying air curtain dehumidifies the introduced air so that the air entering the box-type substation and power cabinet has a low humidity.

[0107] S106: Based on the principle that the faster the air humidity decreases in a prefabricated substation and power cabinet, the better the dehumidification effect, estimate the dehumidification effect R;

[0108] S107: Manually selected threshold R min As the minimum value of the dehumidification effect R, if the estimated dehumidification effect RR min This indicates that the dehumidification effect inside the box-type substation and power cabinet is good, so the axial flow fan is turned off;

[0109] If the dehumidification effect is RR min And relative humidity RHRH max This indicates that the humidity inside the prefabricated substation and power cabinet is very high. Continue to run the axial flow fan until the estimated dehumidification effect RR is achieved. min Turn off the axial flow fan;

[0110] S108: When the estimated dehumidification effect R is close to R min When necessary, shut down the air-heated air curtain machine and the dehumidifying air curtain machine;

[0111] The temperature management mode includes the following steps:

[0112] S201: When the temperature detected by the temperature sensor installed in the box-type substation and power cabinet is greater than 50 degrees, the axial flow fan is started to exhaust and cool down;

[0113] S202: Let the sampling interval of the temperature sensor be T, with N sampling periods as a group, where N is the number of temperature data points used to calculate the average temperature. Then, during the sampling time... The formula for calculating the average temperature over the given time range is as follows:

[0114] ,

[0115] in: Let E represent the average temperature, and E represent the expected value. The temperature data collected by the temperature sensor at sampling intervals T, k=0,…,N; m is a time variable used to distinguish the average temperature calculated in different time periods, and N is a natural number.

[0116] Based on the aforementioned formula for calculating the average temperature, the value at sampling time t is calculated. Temperature data inside Where M is the total number of average temperatures obtained. Indicates the sampling time t The average temperature over the time period Indicates the sampling time t Average temperature over the time period Indicates the sampling time t Average temperature over a period of time;

[0117] S203: At sampling time t During the time period, for Perform linear fitting; using the least squares method, let:

[0118]

[0119] in: Indicates linear fitting of temperature average The slope of the straight line. Indicates linear fitting of temperature average The intercept of a line;

[0120] Represented in matrix form, then:

[0121]

[0122] in: , ,

[0123] Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ;

[0124] After the axial flow fan is started for exhaust cooling, the temperature inside the prefabricated substation and power cabinet shows a downward trend. ;

[0125] S204: If w is a pre-set positive number, or the axial flow fan will stop when the temperature sensor detects that the temperature inside the box-type substation and power cabinet drops to 45 degrees.

[0126] When the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is lower than the set temperature, the air-heating air curtain machine is started to raise the temperature; the air-heating air curtain machine is stopped when the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is higher than the set temperature.

[0127] The air replacement circulation mode includes the following steps:

[0128] S101: If the condensation sensor installed in the box-type substation and power cabinet detects condensation, the heater and fan in the air-heated air curtain machine are started simultaneously for 60 seconds, and then the dehumidifying air curtain machine is started, proceeding to step S102; the air-heated air curtain machine and the dehumidifying air curtain machine are installed in the box-type substation and power cabinet.

[0129] If the condensation sensor does not detect condensation, the fan in the air-heated air curtain and the dehumidifying air curtain are started simultaneously, and the process proceeds to step S103.

[0130] S102: Monitor the status of the condensation sensor in real time. Once the condensation sensor detects no condensation, stop the operation of the heater in the air-heated air curtain machine.

[0131] S103: Estimate the degree of condensation evaporation D on the inner surface of the box-type substation and power cabinet after the air-heated air curtain machine is started by using the condensation evaporation assessment algorithm;

[0132] S104: Manually selected threshold D min As the minimum value of the condensation evaporation degree D, if the condensation evaporation degree D estimated by the aforementioned condensation evaporation assessment algorithm is... D min Or the degree of condensation evaporation D D min And relative humidity (RH) RH max If the evaporation rate of the condensation surface inside the prefabricated substation and power cabinet is high, start the axial flow fan installed inside the prefabricated substation and power cabinet, and proceed to step S105; otherwise, shut down the air-heated air curtain machine and the dehumidifying air curtain machine.

[0133] S105: The axial flow fan draws out the humid air in the box-type substation and power cabinet, and after forming a negative pressure, it begins to effectively introduce air. The dehumidifying air curtain dehumidifies the introduced air so that the air entering the box-type substation and power cabinet has a low humidity.

[0134] S106: Based on the principle that the faster the air humidity decreases in a prefabricated substation and power cabinet, the better the dehumidification effect, estimate the dehumidification effect R;

[0135] S107: Manually selected threshold R min As the minimum value of the dehumidification effect R, if the estimated dehumidification effect R... R min This indicates that the dehumidification effect inside the box-type substation and power cabinet is good, so the axial flow fan is turned off;

[0136] If the dehumidification effect is R R min And relative humidity (RH) RH max This indicates that the humidity inside the prefabricated substation and power cabinet is very high. Continue to run the axial flow fan until the estimated dehumidification effect R is achieved. R min Turn off the axial flow fan;

[0137] S108: When the estimated dehumidification effect R is close to Rmin When necessary, shut down the air-heated air curtain machine and the dehumidifying air curtain machine;

[0138] The algorithm for evaluating condensation evaporation includes the following steps:

[0139] S10301: Let the sampling interval of the humidity sensor be T, with N sampling periods as a group, where N is the number of relative humidity data points used to calculate the average relative humidity. Then, during the sampling time... The formula for calculating the average relative humidity over the given time range is as follows:

[0140] ,

[0141] in: The relative humidity is the average value, and E represents the expected value. The relative humidity data collected by the humidity sensor at sampling interval T, k=0,…,N; m is the time variable used to distinguish the average relative humidity calculated for different time periods, and N is a natural number.

[0142] According to the formula for calculating the average relative humidity, the value at sampling time t is calculated. Relative humidity data Where: M is the total number of average relative humidity values ​​obtained. Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period. S10302: At sampling time t During the time period, for Perform linear fitting; using the least squares method, let:

[0143]

[0144] in: Represents linear fitting of relative humidity The slope of the straight line. Represents linear fitting of relative humidity The intercept of a line;

[0145] Represented in matrix form, then:

[0146]

[0147] in: , ,

[0148] Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ;

[0149] S10303: Assuming that the degree of condensation evaporation D is related to the relative humidity RH and the rate of change of the relative humidity RH, the estimation function for the degree of condensation evaporation is established as follows:

[0150] ,

[0151] in: , , These are undetermined coefficients that are greater than zero;

[0152] The condensation evaporation estimation function characterizes the evaporation rate at sampling time t. The degree of reduction in condensation within a time range during the time period, wherein the condensation evaporation estimation function is related to the sampling time t. Average relative humidity over the last period The slope of the linear fit with relative humidity Relevant, therefore and The larger the relative humidity, the greater the degree of condensation evaporation, D. Therefore, the degree of condensation evaporation, D, is related to the average relative humidity. and Positive correlation;

[0153] S10304: Select duration as For the given time period, calculate the average relative humidity according to steps S10301~S10303. and Based on the changes in condensation in the prefabricated substation and power cabinet, the value of the degree of condensation evaporation D is manually selected;

[0154] S10305: Repeat step S10304 to independently calculate multiple average relative humidity values ​​at different time periods. and The value, and the average relative humidity for different values. and The value corresponds to the value of different manually selected condensation evaporation degree D; then, by using the least squares method for linear fitting, the condensation evaporation degree estimation function can be obtained. , , The value;

[0155] S10306: Based on the obtained , , The value of the calculated average relative humidity. and Substituting the value into the condensation evaporation degree estimation function, the value of condensation evaporation degree D is obtained.

[0156] The above-mentioned method for preventing moisture and condensation in prefabricated substations and power cabinets, compared with the prior art, controls the temperature and humidity inside the prefabricated substations and power cabinets within a set range through the method, thereby achieving moisture and condensation prevention inside the prefabricated substations and power cabinets. This solves the problem that the components inside the existing prefabricated substations and power cabinets are prone to moisture and rust due to poor moisture control and condensation prevention, which leads to risks in the operation of electrical equipment. Example 2

[0157] This invention also proposes a device for implementing the moisture-proof and condensation-proof method for prefabricated substations and power cabinets as described above, such as... Figure 2 As shown, the device includes a main control module 130, a dehumidifying air curtain machine 140, an air-heating air curtain machine 150, an axial flow fan 160, a humidity sensor 120, a condensation surface temperature sensor 121, a dry-bulb temperature sensor 122, a condensation sensor 123, and a temperature sensor 124.

[0158] The main control module 130 is electrically connected to the dehumidifying air curtain 140, the air-heating air curtain 150, the axial flow fan 160, the humidity sensor 120, the condensation surface temperature sensor 121, the dry bulb temperature sensor 122, the condensation sensor 123, and the temperature sensor 124, respectively.

[0159] Humidity sensor 120 is used to collect the relative humidity inside the box-type substation and power cabinet; condensation surface temperature sensor 121 is used to collect the condensation surface temperature inside the box-type substation and power cabinet; dry bulb temperature sensor 122 is used to collect the dry bulb temperature inside the box-type substation and power cabinet; condensation sensor 123 is used to detect condensation inside the box-type substation and power cabinet; and temperature sensor 124 is used to collect the temperature inside the box-type substation and power cabinet.

[0160] The dehumidifying air curtain 140 is used to condense and dehumidify the air intake of the box-type substation and power cabinet to form relatively dry air.

[0161] The air-heated air curtain machine 150 is used to heat the air inside the prefabricated substation and power cabinet to remove moisture from the prefabricated substation and power cabinet.

[0162] The axial flow fan 160 is used to exhaust the hot and humid air inside the prefabricated substation and power cabinet to the outside of the prefabricated substation and power cabinet;

[0163] The main control module 130 is an embedded main control device used to receive data collected by the humidity sensor 120, the condensation surface temperature sensor 121, the dry bulb temperature sensor 122, the condensation sensor 123, and the temperature sensor 124, and to execute the moisture-proof and anti-condensation method for a box-type substation and power cabinet as described in claim 1, and to control the start and stop of the dehumidifying air curtain machine 140, the air-heating air curtain machine 150, and the axial flow fan 160.

[0164] Preferably, the humidity sensor 120, the dry bulb temperature sensor 122, and the temperature sensor 124 are installed in relatively deep positions inside the prefabricated substation and power cabinet, the condensation surface temperature sensor 121 is installed in a position inside the prefabricated substation and power cabinet where condensation is likely to occur, and the condensation sensor 123 is installed in a position inside the prefabricated substation and power cabinet where condensation is likely to occur.

[0165] Preferably, the main control module 130, dehumidifying air curtain 140, air-heating air curtain 150, axial flow fan 160, humidity sensor 120, condensation surface temperature sensor 121, dry bulb temperature sensor 122, condensation sensor 123, and temperature sensor 124 are installed separately and connected electrically to form an integrated device.

[0166] Specifically, refer to Figure 3 The main control module 130 includes an MCU main control circuit board 131, a display 132, an electrical interface 133, and a power supply 134.

[0167] Reference Figure 4 The dehumidifying air curtain 140 includes an electrical interface 141, a dehumidifying condenser plate 142, a hot air generating channel 143, and a fan 144. The dehumidifying condenser plate 142 is composed of a semiconductor cooling chip and is used to condense and dehumidify the incoming air to form relatively dry air. When air enters the hot air generating channel 143, the heat dissipation surface of the semiconductor cooling chip heats the air, thereby achieving the effect of condensing and dehumidifying the incoming air to form relatively dry air. The hot air formed by the air through the hot air generating channel 143 forms a hot air curtain through the fan 144, which blows the surface of the box-type substation and power cabinet over a long distance to quickly remove surface moisture (i.e., water molecules).

[0168] Reference Figure 5 The air-heated air curtain machine 150 includes an electrical interface 151, a heater 152, an air duct 153, and a fan 154. The air in the box-type substation and power cabinet is heated by the heater 152 in the air duct 153 to become hot air, which is then blown by the fan 154 to form a hot air curtain, and the surface of the box-type substation and power cabinet is swept over a long distance to quickly remove the surface moisture (i.e., water molecules).

[0169] Preferably, when the space of the prefabricated substation and power cabinet is small, the air-heated air curtain machine 150 in this device can be omitted.

[0170] Example 3:

[0171] The device proposed in this invention is used to implement a moisture-proof and condensation-proof method for a prefabricated substation and power cabinet. The implementation steps are as follows:

[0172] S1: The relative humidity (RH) is read by a humidity sensor installed in the prefabricated substation and the power cabinet, and the condensation surface temperature is read by a condensation surface temperature sensor. Dry bulb temperature sensor reads dry bulb temperature ;

[0173] S2: Based on relative humidity (RH) and dry-bulb temperature The dew point temperature was estimated using the Magnus-Tetens approximation method. ;

[0174] S3: Based on the condensation surface temperature and dew point temperature Calculate the surface temperature of condensation. and dew point temperature The difference is:

[0175]

[0176] in, Indicates the dew point temperature difference;

[0177] if , For a pre-defined positive number and This indicates the surface temperature at which condensation occurs. Temperature close to dew point Condensation may occur inside the prefabricated substation and power cabinet.

[0178] If the relative humidity (RH) RH max Let RH max =80%, or Switch to air exchange circulation mode;

[0179] If the relative humidity (RH) RH max ,and Switch to temperature management mode;

[0180] The air replacement circulation mode includes the following steps:

[0181] S101: If the condensation sensor installed in the box-type substation and power cabinet detects condensation, the heater and fan in the air-heated air curtain machine are started simultaneously for 60 seconds, and then the dehumidifying air curtain machine is started, proceeding to step S102; the air-heated air curtain machine and the dehumidifying air curtain machine are installed in the box-type substation and power cabinet.

[0182] If the condensation sensor does not detect condensation, the fan in the air-heated air curtain and the dehumidifying air curtain are started simultaneously, and the process proceeds to step S103.

[0183] S102: Monitor the status of the condensation sensor in real time. Once the condensation sensor detects no condensation, stop the operation of the heater in the air-heated air curtain machine.

[0184] S103: Estimate the degree of condensation evaporation D on the inner surface of the box-type substation and power cabinet after the air-heated air curtain machine is started by using the condensation evaporation assessment algorithm;

[0185] S104: Manually selected threshold D min As the minimum value of the condensation evaporation degree D, if the condensation evaporation degree DD estimated by the aforementioned condensation evaporation assessment algorithm is... min Or the degree of condensation evaporation DD min And relative humidity RHRH max If the evaporation rate of the condensation surface inside the prefabricated substation and power cabinet is high, start the axial flow fan installed inside the prefabricated substation and power cabinet, and proceed to step S105; otherwise, shut down the air-heated air curtain machine and the dehumidifying air curtain machine.

[0186] S105: The axial flow fan draws out the humid air in the box-type substation and power cabinet, and after forming a negative pressure, it begins to effectively introduce air. The dehumidifying air curtain dehumidifies the introduced air so that the air entering the box-type substation and power cabinet has a low humidity.

[0187] S106: Based on the principle that the faster the air humidity decreases in a prefabricated substation and power cabinet, the better the dehumidification effect, estimate the dehumidification effect R;

[0188] S107: Manually selected threshold R min As the minimum value of the dehumidification effect R, if the estimated dehumidification effect RR min This indicates that the dehumidification effect inside the box-type substation and power cabinet is good, so the axial flow fan is turned off;

[0189] If the dehumidification effect is RR min And relative humidity RHRH max This indicates that the humidity inside the prefabricated substation and power cabinet is very high. Continue to run the axial flow fan until the estimated dehumidification effect RR is achieved. min Turn off the axial flow fan;

[0190] S108: When the estimated dehumidification effect R is close to R min When necessary, shut down the air-heated air curtain machine and the dehumidifying air curtain machine;

[0191] The temperature management mode includes the following steps:

[0192] S201: When the temperature detected by the temperature sensor installed in the box-type substation and power cabinet is greater than 50 degrees, the axial flow fan is started to exhaust and cool down;

[0193] S202: Let the sampling interval of the temperature sensor be T, with N sampling periods as a group, where N is the number of temperature data points used to calculate the average temperature. Then, during the sampling time... The formula for calculating the average temperature over the given time range is as follows:

[0194] ,

[0195] in: Let E represent the average temperature, and E represent the expected value. The temperature data collected by the temperature sensor at sampling intervals T, k=0,…,N; m is a time variable used to distinguish the average temperature calculated in different time periods, and N is a natural number.

[0196] Based on the aforementioned formula for calculating the average temperature, the value at sampling time t is calculated. Temperature data inside Where M is the total number of average temperatures obtained. Indicates the sampling time t The average temperature over the time period Indicates the sampling time t Average temperature over the time period Indicates the sampling time t Average temperature over a period of time;

[0197] S203: At sampling time t During the time period, for Perform linear fitting; using the least squares method, let:

[0198]

[0199] in: Indicates linear fitting of temperature average The slope of the straight line. Indicates linear fitting of temperature average The intercept of a line;

[0200] Represented in matrix form, then:

[0201]

[0202] in: , ,

[0203] Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ;

[0204] After the axial flow fan is started for exhaust cooling, the temperature inside the prefabricated substation and power cabinet shows a downward trend. ;

[0205] S204: If w is a pre-set positive number, or the axial flow fan will stop when the temperature sensor detects that the temperature inside the box-type substation and power cabinet drops to 45 degrees.

[0206] When the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is lower than the set temperature, the air-heating air curtain machine is started to raise the temperature; the air-heating air curtain machine is stopped when the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is higher than the set temperature.

[0207] The air replacement circulation mode includes the following steps:

[0208] S101: If the condensation sensor installed in the box-type substation and power cabinet detects condensation, the heater and fan in the air-heated air curtain machine are started simultaneously for 60 seconds, and then the dehumidifying air curtain machine is started, proceeding to step S102; the air-heated air curtain machine and the dehumidifying air curtain machine are installed in the box-type substation and power cabinet.

[0209] If the condensation sensor does not detect condensation, the fan in the air-heated air curtain and the dehumidifying air curtain are started simultaneously, and the process proceeds to step S103.

[0210] S102: Monitor the status of the condensation sensor in real time. Once the condensation sensor detects no condensation, stop the operation of the heater in the air-heated air curtain machine.

[0211] S103: Estimate the degree of condensation evaporation D on the inner surface of the box-type substation and power cabinet after the air-heated air curtain machine is started by using the condensation evaporation assessment algorithm;

[0212] S104: Manually selected threshold D min As the minimum value of the condensation evaporation degree D, if the condensation evaporation degree D estimated by the aforementioned condensation evaporation assessment algorithm is... D min Or the degree of condensation evaporation D Dmin And relative humidity (RH) RH max If the evaporation rate of the condensation surface inside the prefabricated substation and power cabinet is high, start the axial flow fan installed inside the prefabricated substation and power cabinet, and proceed to step S105; otherwise, shut down the air-heated air curtain machine and the dehumidifying air curtain machine.

[0213] S105: The axial flow fan draws out the humid air in the box-type substation and power cabinet, and after forming a negative pressure, it begins to effectively introduce air. The dehumidifying air curtain dehumidifies the introduced air so that the air entering the box-type substation and power cabinet has a low humidity.

[0214] S106: Based on the principle that the faster the air humidity decreases in a prefabricated substation and power cabinet, the better the dehumidification effect, estimate the dehumidification effect R;

[0215] S107: Manually selected threshold R min As the minimum value of the dehumidification effect R, if the estimated dehumidification effect R... R min This indicates that the dehumidification effect inside the box-type substation and power cabinet is good, so the axial flow fan is turned off;

[0216] If the dehumidification effect is R R min And relative humidity (RH) RH max This indicates that the humidity inside the prefabricated substation and power cabinet is very high. Continue to run the axial flow fan until the estimated dehumidification effect R is achieved. R min Turn off the axial flow fan;

[0217] S108: When the estimated dehumidification effect R is close to R min When necessary, shut down the air-heated air curtain machine and the dehumidifying air curtain machine;

[0218] The algorithm for evaluating condensation evaporation includes the following steps:

[0219] S10301: Let the sampling interval of the humidity sensor be T, with N sampling periods as a group, where N is the number of relative humidity data points used to calculate the average relative humidity. Then, during the sampling time... The formula for calculating the average relative humidity over the given time range is as follows:

[0220] ,

[0221] in: The relative humidity is the average value, and E represents the expected value. The relative humidity data collected by the humidity sensor at sampling interval T, k=0,…,N; m is the time variable used to distinguish the average relative humidity calculated for different time periods, and N is a natural number.

[0222] According to the formula for calculating the average relative humidity, the value at sampling time t is calculated. Relative humidity data Where: M is the total number of average relative humidity values ​​obtained. Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period. S10302: At sampling time t During the time period, for Perform linear fitting; using the least squares method, let:

[0223]

[0224] in: Represents linear fitting of relative humidity The slope of the straight line. Represents linear fitting of relative humidity The intercept of a line;

[0225] Represented in matrix form, then:

[0226]

[0227] in: , ,

[0228] Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ;

[0229] S10303: Assuming that the degree of condensation evaporation D is related to the relative humidity RH and the rate of change of the relative humidity RH, the estimation function for the degree of condensation evaporation is established as follows:

[0230] ,

[0231] in: , , These are undetermined coefficients that are greater than zero;

[0232] The condensation evaporation estimation function characterizes the evaporation rate at sampling time t. The degree of reduction in condensation within a time range during the time period, wherein the condensation evaporation estimation function is related to the sampling time t. Average relative humidity over the last period The slope of the linear fit with relative humidity Relevant, therefore and The larger the relative humidity, the greater the degree of condensation evaporation, D. Therefore, the degree of condensation evaporation, D, is related to the average relative humidity. and Positive correlation;

[0233] S10304: Select duration as For the given time period, calculate the average relative humidity according to steps S10301~S10303. and Based on the changes in condensation in the prefabricated substation and power cabinet, the value of the degree of condensation evaporation D is manually selected;

[0234] S10305: Repeat step S10304 to independently calculate multiple average relative humidity values ​​at different time periods. and The value, and the average relative humidity for different values. and The value corresponds to the value of different manually selected condensation evaporation degree D; then, by using the least squares method for linear fitting, the condensation evaporation degree estimation function can be obtained. , , The value;

[0235] S10306: Based on the obtained , , The value of the calculated average relative humidity. and Substituting the value into the condensation evaporation degree estimation function, the value of condensation evaporation degree D is obtained.

[0236] Preferably, all computer programs involved in this invention are written and implemented using existing, publicly available, and open-source program code; software programmers in the art can easily implement them according to the technical solutions described in the embodiments of this invention.

[0237] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preventing moisture and condensation in a prefabricated substation and power cabinet, characterized in that, The moisture-proof and condensation-proof method includes the following steps: S1: The relative humidity (RH) is read by a humidity sensor installed in the prefabricated substation and the power cabinet, and the condensation surface temperature is read by a condensation surface temperature sensor. Dry bulb temperature sensor reads dry bulb temperature ; S2: Based on relative humidity (RH) and dry-bulb temperature The dew point temperature was estimated using the Magnus-Tetens approximation method. ; S3: Based on the condensation surface temperature and dew point temperature Calculate the surface temperature of condensation. and dew point temperature The difference is: in, Indicates the dew point temperature difference; if , For a pre-defined positive number and This indicates the surface temperature at which condensation occurs. Temperature close to dew point Condensation may occur inside the prefabricated substation and power cabinet. If the relative humidity (RH) RH max Let RH max =80%, or Switch to air exchange circulation mode; If the relative humidity (RH) RH max ,and Switch to temperature management mode; The temperature management mode includes the following steps: S201: When the temperature detected by the temperature sensor installed in the box-type substation and power cabinet is greater than 50 degrees, the axial flow fan is started to exhaust and cool down; S202: Let the sampling interval of the temperature sensor be T, with N sampling periods as a group, where N is the number of temperature data points used to calculate the average temperature. Then, during the sampling time... The formula for calculating the average temperature over the given time range is as follows: , in: Let E represent the average temperature, and E represent the expected value. The temperature data collected by the temperature sensor at sampling intervals T, k=0,…,N; m is a time variable used to distinguish the average temperature calculated in different time periods, and N is a natural number. Based on the aforementioned formula for calculating the average temperature, the value at sampling time t is calculated. Temperature data inside Where M is the total number of average temperatures obtained. Indicates the sampling time t The average temperature over the time period Indicates the sampling time t Average temperature over the time period Indicates the sampling time t Average temperature over a period of time; S203: At sampling time t During the time period, for Perform linear fitting; using the least squares method, let: in: Indicates linear fitting of temperature average The slope of the straight line. Indicates linear fitting of temperature average The intercept of a line; Represented in matrix form, then: in: , , Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ; After the axial flow fan is started for exhaust cooling, the temperature inside the prefabricated substation and power cabinet shows a downward trend. ; S204: If w is a pre-set positive number, or the axial flow fan will stop when the temperature sensor detects that the temperature inside the box-type substation and power cabinet drops to 45 degrees. When the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is lower than the set temperature, the air-heating air curtain machine is started to raise the temperature; the air-heating air curtain machine is stopped when the temperature sensor detects that the temperature inside the prefabricated substation and power cabinet is higher than the set temperature.

2. The moisture-proof and condensation-proof method for prefabricated substations and power cabinets as described in claim 1, characterized in that, The air replacement circulation mode includes the following steps: S101: If the condensation sensor installed in the box-type substation and power cabinet detects condensation, the heater and fan in the air-heated air curtain machine are started simultaneously for 60 seconds, and then the dehumidifying air curtain machine is started, proceeding to step S102; the air-heated air curtain machine and the dehumidifying air curtain machine are installed in the box-type substation and power cabinet. If the condensation sensor does not detect condensation, the fan in the air-heated air curtain and the dehumidifying air curtain are started simultaneously, and the process proceeds to step S103. S102: Monitor the status of the condensation sensor in real time. Once the condensation sensor detects no condensation, stop the operation of the heater in the air-heated air curtain machine. S103: Estimate the degree of condensation evaporation D on the inner surface of the box-type substation and power cabinet after the air-heated air curtain machine is started by using the condensation evaporation assessment algorithm; S104: Manually selected threshold D min As the minimum value of the condensation evaporation degree D, if the condensation evaporation degree D estimated by the aforementioned condensation evaporation assessment algorithm is... D min Or the degree of condensation evaporation D D min And relative humidity (RH) RH max If the evaporation rate of the condensation surface inside the prefabricated substation and power cabinet is high, start the axial flow fan installed inside the prefabricated substation and power cabinet, and proceed to step S105; otherwise, shut down the air-heated air curtain machine and the dehumidifying air curtain machine. S105: The axial flow fan draws out the humid air in the box-type substation and power cabinet, and after forming a negative pressure, it begins to effectively introduce air. The dehumidifying air curtain dehumidifies the introduced air so that the air entering the box-type substation and power cabinet has a low humidity. S106: Based on the principle that the faster the air humidity decreases in a prefabricated substation and power cabinet, the better the dehumidification effect, estimate the dehumidification effect R; S107: Manually selected threshold R min As the minimum value of the dehumidification effect R, if the estimated dehumidification effect R... R min This indicates that the dehumidification effect inside the box-type substation and power cabinet is good, so the axial flow fan is turned off; If the dehumidification effect is R R min And relative humidity (RH) RH max This indicates that the humidity inside the prefabricated substation and power cabinet is very high. Continue to run the axial flow fan until the estimated dehumidification effect R is achieved. R min Turn off the axial flow fan; S108: When the estimated dehumidification effect R is close to R min When necessary, shut down the air-heated air curtain machine and the dehumidifying air curtain machine.

3. The moisture-proof and condensation-proof method for prefabricated substations and power cabinets as described in claim 2, characterized in that, The algorithm for evaluating condensation evaporation includes the following steps: S10301: Let the sampling interval of the humidity sensor be T, with N sampling periods as a group, where N is the number of relative humidity data points used to calculate the average relative humidity. Then, during the sampling time... The formula for calculating the average relative humidity over the given time range is as follows: , in: The relative humidity is the average value, and E represents the expected value. The relative humidity data collected by the humidity sensor at sampling interval T, k=0,…,N; m is the time variable used to distinguish the average relative humidity calculated for different time periods, and N is a natural number; According to the formula for calculating the average relative humidity, the value at sampling time t is calculated. Relative humidity data Where: M is the total number of average relative humidity values ​​obtained. Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period Indicates the sampling time t The average relative humidity over the time period; S10302: at sampling time t During the time period, for Perform linear fitting; using the least squares method, let: in: Represents linear fitting of relative humidity The slope of the straight line. Represents linear fitting of relative humidity The intercept of a line; Represented in matrix form, then: in: , , Substituting into the least squares objective function, for Differentiate it and set it equal to zero, then we get ; S10303: Assuming that the degree of condensation evaporation D is related to the relative humidity RH and the rate of change of the relative humidity RH, the estimation function for the degree of condensation evaporation is established as follows: ， in: , , These are undetermined coefficients that are greater than zero; The condensation evaporation estimation function characterizes the evaporation rate at sampling time t. The degree of reduction in condensation within a time range during the time period, wherein the condensation evaporation estimation function is related to the sampling time t. Average relative humidity over the last period The slope of the linear fit with relative humidity Relevant, therefore and The larger the relative humidity, the greater the degree of condensation evaporation, D. Therefore, the degree of condensation evaporation, D, is related to the average relative humidity. and Positive correlation; S10304: Select duration as For the given time period, calculate the average relative humidity according to steps S10301~S10303. and Based on the changes in condensation in the prefabricated substation and power cabinet, the value of the degree of condensation evaporation D is manually selected; S10305: Repeat step S10304 to independently calculate multiple average relative humidity values ​​at different time periods. and The value, and the average relative humidity for different values. and The value corresponds to the value of different manually selected condensation evaporation degree D; then, by using the least squares method for linear fitting, the condensation evaporation degree estimation function can be obtained. , , The value; S10306: Based on the obtained , , The value of the calculated average relative humidity. and Substituting the value into the condensation evaporation degree estimation function, the value of condensation evaporation degree D is obtained.

4. A moisture-proof and anti-condensation device for a prefabricated substation and power cabinet, characterized in that, The device is used to implement the moisture-proof and anti-condensation method for a box-type substation and power cabinet as described in claim 1. The device includes a main control module (130), a dehumidifying air curtain machine (140), an air-heating air curtain machine (150), an axial flow fan (160), a humidity sensor (120), a condensation surface temperature sensor (121), a dry bulb temperature sensor (122), a condensation sensor (123), and a temperature sensor (124). The main control module (130) is electrically connected to the dehumidifying air curtain (140), the air-heating air curtain (150), the axial flow fan (160), the humidity sensor (120), the condensation surface temperature sensor (121), the dry bulb temperature sensor (122), the condensation sensor (123), and the temperature sensor (124), respectively. Humidity sensor (120) is used to collect the relative humidity inside the box-type substation and power cabinet; condensation surface temperature sensor (121) is used to collect the condensation surface temperature inside the box-type substation and power cabinet; dry bulb temperature sensor (122) is used to collect the dry bulb temperature inside the box-type substation and power cabinet; condensation sensor (123) is used to detect condensation inside the box-type substation and power cabinet; and temperature sensor (124) is used to collect the temperature inside the box-type substation and power cabinet. The dehumidifying air curtain (140) is used to condense and dehumidify the air intake of the box-type substation and power cabinet to form relatively dry air; The air-heated air curtain machine (150) is used to heat the air inside the box-type substation and power cabinet to remove moisture from the box-type substation and power cabinet. Axial flow fan (160) is used to exhaust hot and humid air inside the box-type substation and power cabinet to the outside of the box-type substation and power cabinet; The main control module (130) is an embedded main control device used to receive data collected by the humidity sensor (120), the condensation surface temperature sensor (121), the dry bulb temperature sensor (122), the condensation sensor (123), and the temperature sensor (124), and to execute the moisture-proof and anti-condensation method for a box-type substation and power cabinet as described in claim 1, and to control the start and stop of the dehumidifying air curtain machine (140), the air-heating air curtain machine (150), and the axial flow fan (160).

5. The moisture-proof and anti-condensation device for the prefabricated substation and power cabinet as described in claim 4, characterized in that, Humidity sensor (120), dry bulb temperature sensor (122), and temperature sensor (124) are installed in relatively deep positions inside the box-type substation and power cabinet. Condensation surface temperature sensor (121) is installed in a position inside the box-type substation and power cabinet where condensation is likely to occur. Condensation sensor (123) is installed in a position inside the box-type substation and power cabinet where condensation is likely to occur.

6. The moisture-proof and anti-condensation device for the prefabricated substation and power cabinet as described in claim 4, characterized in that, The main control module (130), dehumidifying air curtain (140), air-heating air curtain (150), axial flow fan (160), humidity sensor (120), condensation surface temperature sensor (121), dry bulb temperature sensor (122), condensation sensor (123), and temperature sensor (124) are installed separately and are connected electrically to form an integrated device.

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