Switch cabinet safety protection device and switch cabinet

Abstract

The invention relates to the technical field of switch cabinets, in particular to a switch cabinet safety protection device and a switch cabinet. The switch cabinet safety protection device comprises a temperature sensing module which is used for sensing the temperature inside and outside the switch cabinet. And the airflow driving module is used for driving air to enter the switch cabinet. And the refrigeration module is used for refrigerating air in the switch cabinet. And the control module is electrically connected with the temperature sensing module, the humidity sensing module, the airflow driving module and the refrigeration module. Moisture in air is condensed through refrigeration, so that the humidity of entering air is controlled, and the humidity requirement is met while temperature control is achieved. According to the switch cabinet, moisture in air can be prevented from being brought into the switch cabinet to cause damage to electrical components when the humidity is too high, the electrical components can be greatly protected, corrosion in a wet environment is slowed down, the service life of the electrical components is prolonged, and meanwhile the use safety of the switch cabinet is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinets, and in particular to a switch cabinet safety protection device and a switch cabinet. Background Art

[0002] Switchgear is a switching device used for current switching, isolation and control in high-voltage power systems. It usually consists of one or more circuit breakers, which can operate the circuit without power outage. Switchgear is widely used in power plants, transmission lines, distribution stations and other occasions, providing important guarantee for the stable operation of power systems. The main components of the switchgear include: Base: installed on the ground, used to support the entire switchgear and improve its stability. Compartment: divides the interior of the switchgear into different areas to achieve functions such as current isolation and control. Circuit breaker: responsible for cutting off and connecting the circuit, which is the core part of the switchgear. Grounding system: used to ensure the safety and reliability of the switchgear, prevent electric shock and other accidents. Sensors and actuators: used to monitor and control the working status of the switchgear, as well as to realize the function of automation. Communication interface: convenient for remote monitoring and management of the switchgear. Arc extinguishing device: used to absorb and disperse the arc to prevent the arc from spreading to other areas. According to the voltage level and purpose, switchgear can be divided into many types, such as conventional switchgear, outdoor switchgear, indoor switchgear, gas insulated switchgear, vacuum switchgear, SF6 gas insulated switchgear, etc. Each type of switchgear has its own characteristics and scope of application. The switchgear needs to be maintained and maintained during use to ensure its reliability and safety. Regular inspection and maintenance of the switchgear and timely replacement of damaged parts can effectively extend the service life of the switchgear.

[0003] Electrical components will be affected to a certain extent during use, among which humidity is an important factor. Excessive or low humidity may cause electrical components to malfunction or performance degradation. The following lists the effects of humidity changes on some common electrical components: Power supply components: Transformers, rectifier diodes, etc. in power supply components are susceptible to corrosion, leakage and other problems in a humid environment, which may cause unstable power supply or damage to electrical appliances. Switches and relays: Electrical components such as switches and relays may rust, fail to open / close tightly, etc. when they are in a humid environment for a long time. Cables and plugs: The insulation layer of cables and plugs is easily damaged when exposed to a humid environment for a long time, which may cause safety hazards such as electric shock. Circuit protection: When the humidity is high, it is easy to cause circuit protection components (such as fuses) to melt, affecting normal power supply; when the humidity is low, it may cause a circuit short circuit, causing accidents such as fire. Sensors: The accuracy and balance of humidity sensors will be affected by humidity fluctuations, such as temperature compensation errors and output signal distortion. In response to the impact of humidity on electrical components, the following measures can be taken to prevent and deal with it: Use moisture-proof packaging materials to protect electrical products from the influence of humid environments. Maintain proper ventilation during storage and transportation to reduce relative humidity. Provide desiccant for key equipment and components to absorb excess moisture. Replace and repair damaged electrical components in a timely manner to prevent further damage caused by deterioration of the humid environment. Regularly check the humidity of electrical equipment and systems, and promptly detect and handle abnormalities.

[0004] The existing switch cabinets do not have both cooling and dehumidification protection devices, making protection difficult. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a switch cabinet safety protection device for intelligently controlling the temperature and humidity in the switch cabinet. The switch cabinet safety protection device may include: The temperature sensing module is used to sense the temperature inside and outside the switch cabinet. The temperature sensing module is an electronic device used to measure and monitor temperature. It can convert the temperature changes in the environment into readable values ​​and output them to the user.

[0006] The humidity sensing module is used to sense the humidity inside and outside the switch cabinet. The humidity sensing module is an electronic device used to detect the ambient humidity and convert it into a digital signal output. The humidity sensing module mainly measures the humidity in the environment through various internal humidity sensors.

[0007] The airflow driving module is used to drive air into the switch cabinet, form airflow in the switch cabinet, and finally discharge the air out of the switch cabinet. In the design of the switch cabinet, an air inlet and an air outlet are generally opened on opposite sides of the switch cabinet.

[0008] The refrigeration module is used to cool the air in the switch cabinet. As mentioned above, when the temperature difference between the inside and outside of the switch cabinet is small, the effect of this simple cooling method is poor and often fails to achieve the purpose of cooling. At this time, the refrigeration module is needed for assistance.

[0009] The control module is electrically connected to the temperature sensing module, humidity sensing module, airflow driving module and refrigeration module, and is used to receive the temperature and humidity values ​​sensed by the temperature sensing module and humidity sensing module, and to control the airflow driving module to drive the airflow and refrigeration module to perform refrigeration. 1 and the external temperature T 2 , humidity inside the switch cabinet AH 1 and external humidity AH 2 , determine the internal temperature T 1 Is it greater than a preset operating temperature T 1 标 If not, no cooling is required; if yes, the external temperature T is determined. 2 Is it less than a preset cooling temperature T 2 标 If not, turn on the refrigeration module to cool down the inside of the switch cabinet. If yes, determine the working temperature T 1 标 RH 2 Is it greater than a preset RH? 2 标 If not, the airflow driving module is normally controlled to drive the air to cool down. If yes, the airflow driving module and the refrigeration module are started. The airflow driving module drives the air to enter, and the refrigeration module cools the incoming air to the cooling temperature T0.

[0010] Preferred: Preset working temperature T 1 标 The maximum temperature of the electrical components in the switch cabinet during normal use may be obtained by obtaining the upper limit temperature of each electrical component in the switch cabinet, and then using the minimum upper limit temperature as the operating temperature T 1 标 This operation temperature T 1 标 The method of obtaining it is relatively simple, and it can ensure that each electrical component can work within the normal temperature, ensuring its safety in use. However, this requires frequent cooling, and the cooling threshold is low, which will require a lot of energy to maintain, and the maintenance cost is high.

[0011] Preferred: Preset working temperature T 1 标It can also be calculated based on the tolerance of each electrical component. The specific calculation method includes: obtaining the information data of various electrical components and their upper limit temperature. The upper limit temperature here does not mean that the electrical components will be damaged if it exceeds this temperature, but that when working at this temperature, it will cause damage to the electrical components, and its loss is greater than the normal range. The specific temperature varies according to the type, material, and process of the electrical components. And sort them from low to high according to the upper limit temperature, and then calculate the optimized tolerance temperature T' of the electrical appliances in the switch cabinet, and use the optimized tolerance temperature T' of the electrical appliances as the working temperature T 1 标 .

[0012] Preferably, the method for calculating the optimal temperature tolerance of the electrical appliance may include: calculating the tolerance factor t of the electrical component, the tolerance factor , where i and j are the sorting numbers of electrical components, t i is the tolerance factor of the electrical component numbered i, and I is the total number of electrical component types. j≥i; i, j=1, 2, ..., I; first, if j=1, calculate the tolerance factor , and then determine whether the tolerance factor is greater than a preset standard factor t 标 If yes, the upper limit temperature of the electrical component corresponding to j is determined to be the electrical tolerance optimization temperature T'; if no, the tolerance factor is calculated for j+1 , and repeat the above steps.

[0013] Preferred: Tolerance coefficient t i It can be obtained based on experience, or by calculation. The specific method of obtaining it can include the tolerance coefficient , where n is the tolerance factor number, f n is the tolerance factor value of the tolerance factor numbered n, N is the total number of tolerance factors, n=1, 2, ..., N. The tolerance factor is the value corresponding to the corresponding tolerance factor.

[0014] Preferably: the tolerance factors may include quantity, importance of electrical components, and degree of damage of electrical components, which may be included in the information data of the electrical components. The tolerance factor of quantity may be the quotient of the actual quantity and the standard quantity. The tolerance factor of the importance of electrical components may be a manually set level, and a value may be assigned according to the level. The tolerance factor of the degree of damage of electrical components may be the damage level at the current upper limit temperature, which may be set manually. Of course, we may also set it to a fixed value, but the calculation error is relatively large. The cooling threshold set by this method is more reasonable, and can intelligently analyze the performance of each electrical component, set a suitable cooling threshold, realize component protection and reduce energy consumption, and achieve an optimized balance.

[0015] Preferred: Cooling temperature T 2标 The specific value can be determined according to the working temperature T 1 标 And the cooling temperature difference is calculated. Specifically, the cooling temperature T 2 标 =T 1 标 -ΔT, where ΔT is the standard cooling temperature difference, which can be set according to the specific situation, generally 10-30℃.

[0016] Preferably: the working temperature T 1 标 Next , where AH S is the operating temperature T 1 标 Saturated water vapor density.

[0017] Preferably, the cooling temperature T0 can be set manually based on experience, or can be obtained by calculation. The specific method of obtaining the temperature may include: calculating the upper limit absolute humidity AH 2 ', the upper limit absolute humidity of the working , we pass the working temperature T 1 标 The default RH 2 标 The humidity can meet the temperature and humidity requirements of the electrical components, and can protect the electrical components to the greatest extent. The saturated water vapor density AHS' after cooling is calculated by calculating the upper limit absolute humidity, and then the saturated water vapor density-temperature information table prepared in advance is searched according to the saturated water vapor density AHS', so as to obtain the cooling temperature T0. The saturated water vapor density-temperature information table is a prior art, and will not be described in detail here.

[0018] Preferred: Saturated water vapor density after cooling , where ΔAH is the deviation water vapor density. Theoretically, if the incoming air temperature is uniform and can be cooled to the cooling temperature, its value is zero. In the actual operation process, its value is generally 0.2-5g / m 3 Of course, this value is not universal. It needs to be determined according to equipment parameters, switch cabinet volume, temperature difference, airflow drive module, etc. The details are not described here. By cooling and dehumidifying the switch cabinet in this way, the electrical components in the switch cabinet can be prevented from working in an overheated and overhumidified environment. While ensuring the normal operation of the electrical appliances, energy can be saved to the maximum extent and energy consumption can be reduced.

[0019] The present invention also proposes a switch cabinet, which includes a cabinet body and the switch cabinet safety protection device described above. The cabinet body is provided with an air inlet and an air outlet, and the air flow drive module is installed at the air inlet or the air outlet. The refrigeration module is installed on the inner wall of the cabinet at the air inlet position. The control module can be set on the cabinet body or remotely controlled, and is set according to actual needs. The internal temperature T of the switch cabinet is obtained. 1 and the external temperature T 2 , humidity inside the switch cabinet AH 1 and external humidity AH 2 , determine the internal temperature T 1 Is it greater than a preset operating temperature T 1 标 If not, no cooling is required; if yes, the external temperature T is determined. 2 Is it less than a preset cooling temperature T 2 标 If not, turn on the refrigeration module to cool down the inside of the switch cabinet. If yes, determine the working temperature T 1 标 RH 2 Is it greater than a preset RH? 2 标 If not, the airflow drive module is normally controlled to drive the air to cool down. If yes, the airflow drive module and the refrigeration module are started. The airflow drive module drives the air to enter, and the refrigeration module cools the incoming air to the cooling temperature T0. In this way, moisture in the air can be prevented from being brought into the switch cabinet, and damage to electrical components caused by excessive humidity can be avoided. This can greatly protect electrical components, slow down corrosion in a humid environment, extend the service life of electrical components, and increase the safety of the switch cabinet.

[0020] Preferably: a condensation water tank is installed on the inner wall of the cabinet, and the condensation water tank is located below the refrigeration module. The condensation water tank is used to receive water droplets condensed by the refrigeration module. The bottom of the condensation water tank is fixedly connected to a drain pipe, and the drain pipe can extend out of the cabinet. The condensed water droplets enter the condensation water tank and then are discharged from the cabinet through the drain pipe.

[0021] Preferably, hinges can be provided at the air inlet and the air outlet of the cabinet body. The hinges on the air inlet can limit the air to enter the air only when the airflow driving module is driven. When the airflow exists, the airflow drives the blades on the hinges to rotate, and there will be gaps between the rotating blades for airflow to pass through, so as to facilitate air to enter. When the airflow driving module stops driving, the airflow disappears. Under the action of gravity, the blades of the hinges contact each other, and the gaps for airflow to pass through disappear, so that the switch cabinet is separated from the external environment to form a closed space, so that external humidity can be prevented from entering the switch cabinet.

[0022] The technical effects and advantages of the present invention are as follows: the present invention condenses the moisture in the air through refrigeration, thereby controlling the humidity of the incoming air, achieving temperature control while meeting humidity requirements. It can prevent moisture in the air from entering the switch cabinet, prevent damage to electrical components when the humidity is too high, greatly protect electrical components, slow down corrosion in a humid environment, extend the service life of electrical components, and increase the safety of the switch cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural block diagram of a switch cabinet safety protection device proposed by the present invention.

[0024] Figure 2 This is a control flow chart of a control module in a switch cabinet safety protection device proposed by the present invention.

[0025] Figure 3 This is a flow chart of a method for calculating the optimized temperature tolerance of an electrical appliance of a control module in a switch cabinet safety protection device proposed by the present invention.

[0026] Figure 4 This is a structural diagram of the air inlet in a switch cabinet proposed by the present invention.

[0027] Description of the reference numerals: cabinet 1, condenser 2, opening and closing leaf 3, condensation water tank 4, drain pipe 5, air inlet 6. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0029] Example 1 Reference Figure 1 In this embodiment, a switch cabinet safety protection device is proposed, which is used to intelligently control the temperature and humidity in the switch cabinet. The switch cabinet safety protection device may include: The temperature sensing module is used to sense the temperature inside and outside the switch cabinet. The temperature sensing module is an electronic device used to measure and monitor temperature. It can convert the temperature change in the environment into a readable value and output it to the user. The temperature sensing module can convert the temperature signal into a corresponding electrical signal through internal thermistors (NTC), thermocouples, infrared sensors and other sensor devices. Among them, the thermistor is a resistor element that changes its resistance according to the change of the thermal expansion coefficient of the material; the thermocouple is a device that uses the thermoelectric effect of two different metals to measure the temperature; the infrared sensor can sense the infrared radiation energy emitted by the object, thereby calculating the surface temperature of the object. The specific structure of the temperature sensing module is the existing technology and will not be described in detail here. The temperature sensing module can be provided with two, one of which is set outside the switch cabinet to sense the temperature outside the switch cabinet. The sensed temperature is the temperature of the environment outside the switch cabinet. When the temperature inside the switch cabinet is too high and air circulation is required, the airflow outside the switch cabinet can be driven to cool the air inside the switch cabinet and the electronic components inside the switch cabinet. Another temperature sensing module can be installed inside the switch cabinet to sense the temperature inside the switch cabinet. In actual work, when the electrical components in the switch cabinet are working, a lot of heat will be generated. The generated heat needs to be discharged from the switch cabinet in time. Otherwise, the temperature inside the switch cabinet is too high, which will cause the electrical components to overheat. Not only will it easily damage the electrical components, but in serious cases, it will also cause fires and cause significant economic losses. Of course, you can also install the temperature sensing module only in the switch cabinet to obtain the temperature inside the switch cabinet. The temperature outside the switch cabinet can be obtained according to the weather forecast, or it can be obtained after being corrected by the weather forecast temperature. The details are not repeated here.

[0030] The humidity sensing module is used to sense the humidity inside and outside the switch cabinet. The humidity sensing module is an electronic device used to detect the humidity of the environment and convert it into a digital signal output. The humidity sensing module mainly measures the humidity in the environment through various humidity sensors inside. The humidity detected here is absolute humidity. The data of absolute humidity is relatively objective and will not change due to the air flow in different temperature environments. There can also be two humidity sensing modules, one of which is set outside the switch cabinet to sense the humidity outside the switch cabinet. The humidity sensed is the humidity of the environment outside the switch cabinet. When the temperature inside the switch cabinet is too high and air circulation is required, the air outside the switch cabinet can be driven to form an airflow to cool the electronic components in the switch cabinet. At this time, the humidity in the environment will be introduced into the switch cabinet. Another humidity sensing module can be installed inside the switch cabinet to sense the humidity inside the switch cabinet. In actual work, air humidity is an important parameter of the operating environment of the switch cabinet, which will have a certain impact on the components in the switch cabinet. The following are several effects of air humidity on the components in the switch cabinet: Impact on contact performance: The main function of key components such as circuit breakers and disconnectors in the switch cabinet is to transmit current through contact. When the air is humid, the insulating medium between the contacts may absorb moisture, resulting in a decrease in electrical performance. Impact on metal materials: Changes in air humidity can cause changes in the electrochemical reactions of metal materials, which may cause corrosion of metal materials. This is especially true for key components that are exposed to or operate in a humid environment, such as springs and contactors. Generally, when air enters the switch cabinet, its temperature and relative humidity will increase, but the humidity tolerance requirements of some electrical components in the switch cabinet are very strict, and some are even lower than 50%, so the humidity needs to be controlled.

[0031] The airflow driving module is used to drive the air into the switch cabinet, form an airflow in the switch cabinet, and finally discharge it from the switch cabinet. In the design of the switch cabinet, an air inlet 6 and an air outlet are generally provided on the opposite sides of the switch cabinet. The airflow driving module can be a fan, an air pump, etc., which can be installed at the air inlet 6 or the air outlet. When the airflow driving module is started, the airflow driving module drives the air into the switch cabinet, the air forms an airflow and flows through the surface of each working electrical component, carries away the heat generated by the electrical components, and finally discharges it from the air outlet. This cooling method is more common by driving the air to form an airflow for cooling, but it requires a certain temperature difference between the inside and outside of the switch cabinet, and the ambient temperature needs to meet the cooling requirements. If the temperature difference between the inside and outside of the switch cabinet is small, this simple cooling method will be less effective and often cannot achieve the cooling purpose. The air inlet 6 and the air outlet of the switch cabinet can be provided with opening and closing pages 3. The opening and closing pages 3 on the air inlet 6 can limit the air to enter the air only when the airflow driving module is driven. When the airflow exists, the airflow will drive the blades on the opening and closing pages 3 to rotate, and there will be gaps between the rotating blades for airflow to pass through, so as to facilitate air to enter. When the airflow driving module stops driving, the airflow disappears, and under the action of gravity, the blades of the opening and closing pages 3 contact each other, and the gaps for airflow to pass through disappear, so that the switch cabinet is separated from the external environment, forming a closed space, so that the external humidity can be prevented from entering the switch cabinet.

[0032] The refrigeration module is used to cool the air in the switch cabinet. As mentioned above, when the temperature difference between the inside and outside of the switch cabinet is small, this simple cooling method is less effective and often fails to achieve the purpose of cooling. At this time, a refrigeration module is needed for assistance. The refrigeration module is generally a condenser 2. The specific structure is the prior art and will not be described here. The refrigeration module is generally arranged at the air inlet 6, which can cool the air entering the switch cabinet. The temperature of the air will be reduced, so as to facilitate better cooling of the electrical components inside the switch cabinet. It should be noted that a condensation tank 4 needs to be provided below the refrigeration module. The condensation tank 4 is fixedly connected to the inner wall of the switch cabinet. The condensation tank 4 is used to receive the water droplets condensed by the refrigeration module. The bottom of the condensation tank 4 is fixedly connected to the drain pipe 5. The drain pipe 5 can extend out of the switch cabinet. The condensed water droplets enter the condensation tank 4 and then are discharged from the switch cabinet through the drain pipe 5.

[0033] The control module is electrically connected to the temperature sensing module, the humidity sensing module, the airflow driving module and the refrigeration module, and is used to receive the temperature and humidity values ​​sensed by the temperature sensing module and the humidity sensing module, and to control the airflow driving module to drive the airflow and the refrigeration module to perform refrigeration. Figure 2 , the specific control method may include: obtaining the internal temperature T of the switch cabinet 1 and the external temperature T 2 , humidity inside the switch cabinet AH 1and external humidity AH 2 , determine the internal temperature T 1 Is it greater than a preset operating temperature T 1 标 If not, cooling is not required. If yes, the external temperature T 2 Is it less than a preset cooling temperature T 2 标 , the preset working temperature here is T 1 标 The maximum temperature of the electrical components in the switch cabinet during normal use may be obtained by obtaining the upper limit temperature of each electrical component in the switch cabinet, and then using the minimum upper limit temperature as the operating temperature T 1 标 This operation temperature T 1 标 The method of obtaining is relatively simple, and it can ensure that each electrical component can work within the normal temperature to ensure its safety in use. However, this requires frequent cooling, and the threshold of cooling is relatively low, which will require a lot of energy to maintain, and the maintenance cost is relatively high. Of course, we can also calculate according to the tolerance of each electrical component. The specific calculation method includes: obtaining the information data of various electrical components and their upper limit temperature. The upper limit temperature here does not mean that the electrical components will be damaged if it exceeds this temperature, but when working at this temperature, it will cause damage to the electrical components, and its loss is greater than the normal range. The specific temperature varies according to the type, material, and process of the electrical component, and the specific details will not be repeated here. Sort from low to high according to the upper limit temperature, and then calculate the optimized tolerance temperature T' of the electrical appliances in the switch cabinet, and use the optimized tolerance temperature T' of the electrical appliances as the working temperature T 1 标 . refer to Figure 3 The method for calculating the optimal temperature of the electrical appliance may include: calculating the tolerance factor t of the electrical component, the tolerance factor , where i and j are the sorting numbers of electrical components, t i is the tolerance factor of the electrical component numbered i, and I is the total number of electrical component types. j≥i; i, j=1, 2, ..., I; first, if j=1, calculate the tolerance factor , and then determine whether the tolerance factor is greater than a preset standard factor t 标 If yes, the upper limit temperature of the electrical component corresponding to j is determined to be the electrical tolerance optimization temperature T'; if no, the tolerance factor is calculated for j+1 , and repeat the above steps. The standard factor t 标It can be set according to the actual situation, specifically to balance power loss, equipment protection, etc., and can be adjusted in real time according to the actual situation. The details are not repeated here. For example, there are three electrical components A1, A2 and A3 in a switch cabinet. The corresponding upper temperature limits of the three are 50℃, 55℃ and 60℃ respectively. The tolerance coefficients of the three electrical components are 0.2, 0.3 and 0.4 respectively. By comprehensively considering the power and protection of the switch cabinet, we set the standard factor t 标 is 0.4, then the process of calculating the optimal temperature T' of the electrical appliance is as follows: Let j = 1, the tolerance factor =0.2, at this time 0.2 is less than 0.4, so continue to set j=2, the tolerance factor =0.2+0.3=0.5, at this time 0.5 is greater than 0.4, then we get the electrical tolerance optimization temperature T' is A2 corresponding to the electrical component use upper limit temperature is the electrical tolerance optimization temperature T', electrical tolerance optimization temperature T' is 55 ℃. Of course, this is just a simple example, for the sake of ease of understanding, it is not universal. The electrical tolerance optimization temperature T' can also be obtained by other methods, such as the upper limit temperature of the most important electrical components, the median upper limit temperature, etc., the details will not be repeated here. Tolerance coefficient t i It can be obtained based on experience, or by calculation. The specific method of obtaining it can include the tolerance coefficient , where n is the tolerance factor number, f n is the tolerance factor value of the tolerance factor numbered n, N is the total number of tolerance factors, n=1, 2, ..., N; the tolerance factor is the value corresponding to the corresponding tolerance factor, and the tolerance factor may include quantity, importance of electrical components, and degree of damage of electrical components, which may be included in the information data of the electrical components. The tolerance factor of quantity may be the quotient of the actual quantity and the standard quantity. The tolerance factor of the importance of electrical components may be a manually set level, and the value may be assigned according to the level. The tolerance factor of the degree of damage of electrical components may be the damage level at the current upper limit temperature, which may be set manually. Of course, we may also set it to a fixed value, but the calculation error is large. Since it is not the subject of protection of this application, the specific setting method will not be described here. The cooling threshold set by this method is more reasonable, and the performance of each electrical component can be intelligently analyzed, and a suitable cooling threshold can be set to achieve component protection and reduce energy consumption, thereby achieving an optimized balance. For example, for an electrical component, the number of electrical components in the switch cabinet is 8, the standard number is 10, its importance level is 3, the tolerance factor value corresponding to importance level 3 is 0.6, and the tolerance factor of the damage degree of the electrical component at 55℃ is 0.83. Then we can calculate the tolerance factor to be 0.8×0.6×0.83=0.4. Of course, this is just a simple example for the sake of ease of understanding, and it is not necessarily universal. Cooling temperature T2 标 The specific value can be determined according to the working temperature T 1 标 And the cooling temperature difference is calculated. Specifically, the cooling temperature T 2 标 =T 1 标 -ΔT, where ΔT is the standard cooling temperature difference, which can be set according to the specific situation, generally 10-30℃, and the specific details are not repeated here. 2 Greater than the preset cooling temperature T 2 标 When the external temperature T 2 Less than or equal to the preset cooling temperature T 2 标 When the working temperature T 1 标 RH 2 Is it greater than a preset RH? 2 标 If not, the airflow drive module is normally controlled to drive the air to cool down. If yes, the airflow drive module and the refrigeration module are started. The airflow drive module drives the air to enter, and the refrigeration module cools the incoming air to the cooling temperature T0. In this way, it is possible to avoid bringing moisture in the air into the switch cabinet, and avoid damage to electrical components when the humidity is too high. It can greatly protect electrical components, slow down corrosion in a humid environment, extend the service life of electrical components, and increase the safety of the switch cabinet. In the present invention, it is assumed that the air humidity will not be too low. The situation where the air humidity is too low is very rare, so it is not considered in this application. The working temperature T 1 标 Next , where AH S is the operating temperature T 1 标 The saturated water vapor density is a prior art, which will not be described in detail here. 2 标 It can be determined according to the actual situation. Generally, it is the lowest humidity upper limit of the electrical components in the switch cabinet, and the value is 50%-90%. The specific details are not repeated here. The cooling temperature T0 can be set manually based on experience, or it can be obtained by calculation. The specific method of obtaining it may include: calculating the upper limit absolute humidity AH 2 ', the upper limit absolute humidity of the working , we pass the working temperature T 1 标 The default RH 2 标Working with humidity can satisfy the temperature and humidity requirements of electrical components, and can protect electrical components to the greatest extent. The saturated water vapor density AHS' after cooling is calculated by calculating the upper limit absolute humidity, and then the saturated water vapor density-temperature information table prepared in advance is searched according to the saturated water vapor density AHS', so as to obtain the cooling temperature T0. The saturated water vapor density-temperature information table is a prior art, and will not be described in detail here. Specifically, the saturated water vapor density after cooling can be calculated. , where ΔAH is the deviation water vapor density. Theoretically, if the incoming air temperature is uniform and can be cooled to the cooling temperature, its value is zero. In the actual operation process, its value is generally 0.2-5g / m 3 Of course, this value is not universal and needs to be determined according to equipment parameters, switch cabinet volume, temperature difference, airflow drive module, etc. Of course, there are other ways to set the cooling temperature T0, which will not be described in detail here. By cooling and dehumidifying the switch cabinet in this way, the electrical components in the switch cabinet can be prevented from working in an overheated and overhumid environment. While ensuring the normal operation of the electrical appliances, energy can be saved to the maximum extent and energy consumption can be reduced.

[0034] Example 2 Reference Figure 4 The present invention also proposes a switch cabinet, which includes a cabinet body 1 and the switch cabinet safety protection device described above. An air inlet 6 and an air outlet are provided on the cabinet body 1, and an air flow drive module is installed at the air inlet 6 or the air outlet. The refrigeration module is installed on the inner wall of the cabinet body 1 at the position of the air inlet 6. The control module can be set on the cabinet body 1, or it can be remotely controlled, and it is set according to actual needs. A condensation tank 4 is installed on the inner wall of the cabinet body 1. The condensation tank 4 is located below the refrigeration module. The condensation tank 4 is used to receive the water droplets condensed by the refrigeration module. The bottom of the condensation tank 4 is fixedly connected to the drain pipe 5. The drain pipe 5 can extend out of the cabinet body 1. The condensed water droplets enter the condensation tank 4 and then are discharged from the cabinet body 1 through the drain pipe 5. The internal temperature T of the switch cabinet is obtained. 1 and external temperature T 2 , humidity inside the switch cabinet AH 1 and external humidity AH 2 , determine the internal temperature T 1 Is it greater than a preset operating temperature T 1 标 If not, no cooling is required; if yes, the external temperature T is determined. 2 Is it less than a preset cooling temperature T 2 标 If not, turn on the refrigeration module to cool down the inside of the switch cabinet. If yes, determine the working temperature T 1 标 RH2 Is it greater than a preset RH? 2 标 If not, the airflow drive module is normally controlled to drive the air to cool down. If yes, the airflow drive module and the refrigeration module are started. The airflow drive module drives the air to enter, and the refrigeration module cools the incoming air to the cooling temperature T0. In this way, moisture in the air can be prevented from being brought into the switch cabinet, and damage to electrical components caused by excessive humidity can be avoided. This can greatly protect electrical components, slow down corrosion in a humid environment, extend the service life of electrical components, and increase the safety of the switch cabinet.

[0035] The air inlet 6 and the air outlet of the cabinet 1 can be provided with opening and closing pages 3. The opening and closing pages 3 on the air inlet 6 can limit the air to enter the air only when the airflow driving module is driven. When the airflow exists, the airflow will drive the blades on the opening and closing pages 3 to rotate, and there will be gaps between the rotating blades for airflow to pass through, so as to facilitate air to enter. When the airflow driving module stops driving, the airflow disappears. Under the action of gravity, the blades of the opening and closing pages 3 contact each other, and the gaps for airflow to pass through disappear, so that the switch cabinet is separated from the external environment to form a closed space, so that the external humidity can be prevented from entering the switch cabinet.

[0036] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A switch cabinet safety protection device, characterized in that: The switch cabinet safety protection device comprises: Temperature sensing module, which is used to sense the temperature inside and outside the switch cabinet; Humidity sensing module, which is used to sense the humidity inside and outside the switch cabinet; An air flow driving module, which is used to drive air into the switch cabinet; A refrigeration module, which is used to cool the air in the switch cabinet; The control module is electrically connected to the temperature sensing module, the humidity sensing module, the airflow driving module and the refrigeration module, and is used to obtain the internal temperature T of the switch cabinet. 1 , External temperature T 2 And the external humidity of the switch cabinet AH 2 ; Determine the internal temperature T 1 Is it greater than a preset operating temperature T 1 标 If not, no cooling is required; if yes, the external temperature T is determined. 2 Is it less than a preset cooling temperature T 2 标 If not, turn on the refrigeration module to cool down the inside of the switch cabinet; if yes, determine the working temperature T 1 标 RH 2 Is it greater than a preset RH? 2 标 If not, the airflow driving module is controlled to drive the air to cool down. If yes, the airflow driving module and the refrigeration module are started. The airflow driving module drives the air to enter, and the refrigeration module cools the incoming air to the cooling temperature T0.

2. A switch cabinet safety protection device according to claim 1, characterized in that: Preset operating temperature T 1 标 The obtaining method includes: obtaining the upper limit temperature of each electrical component in the switch cabinet, and then taking the minimum upper limit temperature as the working temperature T 1 标 .

3. A switch cabinet safety protection device according to claim 1, characterized in that: Preset operating temperature T 1 标 The calculation method includes: obtaining the information data of various electrical components and their upper limit temperatures, and sorting them from low to high according to the upper limit temperatures, and then calculating the optimal tolerance temperature T' of the electrical appliances in the switch cabinet, and using the optimal tolerance temperature T' of the electrical appliances as the working temperature T 1 标 .

4. A switch cabinet safety protection device according to claim 3, characterized in that: The method for calculating the optimal temperature of the electrical appliance comprises: calculating the tolerance factor t of the electrical component, the tolerance factor , where i and j are the sorting numbers of electrical components, t i is the tolerance factor of the electrical component numbered i, I is the total number of electrical component types; j ≥ i; i, j = 1, 2, ..., I; first, j = 1, calculate the tolerance factor, and then determine whether the calculated tolerance factor is greater than a preset standard factor t 标 If yes, then the upper limit temperature of the electrical component corresponding to j is determined to be the electrical tolerance optimization temperature T'; if not, the tolerance factor is calculated for j+1 and the judgment is repeated.

5. A switch cabinet safety protection device according to claim 1, characterized in that: Cooling temperature T 2 标 =T 1 标 -ΔT, where ΔT is the standard cooling temperature difference.

6. A switch cabinet safety protection device according to claim 1, characterized in that: The working temperature T 1 标 Next , where AH S is the operating temperature T 1 标 Saturated water vapor density.

7. A switch cabinet safety protection device according to claim 6, characterized in that: The method for obtaining the cooling temperature T0 includes: calculating the upper limit absolute humidity AH 2 ', the saturated water vapor density AHS' after cooling is calculated by the working upper limit absolute humidity, and then the pre-prepared saturated water vapor density-temperature information table is searched according to the saturated water vapor density AHS' to obtain the cooling temperature T0.

8. A switch cabinet, characterized in that: The switch cabinet comprises: A cabinet body, and a switch cabinet safety protection device as described in any one of claims 1 to 7.

9. A switch cabinet according to claim 8, characterized in that: A condensation water tank is installed on the inner wall of the cabinet, and the condensation water tank is located below the refrigeration module. The condensation water tank is used to receive water droplets condensed by the refrigeration module. The bottom of the condensation water tank is fixedly connected to a drain pipe, which extends out of the cabinet. The condensed water droplets enter the condensation water tank and are then discharged from the cabinet through the drain pipe.

10. The switch cabinet according to claim 8, characterized in that: An air inlet and an air outlet are provided on the cabinet body, and opening and closing pages are provided at the positions of the air inlet and the air outlet of the cabinet body.

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