Energy-saving and environment-friendly switch cabinet

Abstract

The invention relates to the technical field of energy-saving power grid switch cabinets, in particular to an energy-saving environment-friendly switch cabinet which comprises a cabinet body and further comprises a detection module used for detecting the air temperature of a plurality of temperature sampling points inside the cabinet body, the humidity value outside the cabinet body and the volatile gas concentration inside the cabinet body; the power supply module comprises a main bus and a power distribution bus connected with the main bus; the switch control module comprises a circuit breaker and a moving contact which is used for breaking a main loop current for supplying power to the power distribution bus from the main bus; the energy-saving and environment-friendly heat dissipation module is used for dissipating heat in the cabinet body and comprises an exhaust fan used for exhausting hot air in the cabinet body to the outside of the cabinet body and a natural ventilation plate arranged on the side wall of the cabinet body; wherein the stop speed of the exhaust fan is determined according to the shortest linear distance between the target humidity hidden rapid entry area and the moving contact; the start-stop temperature threshold value of the exhaust fan is determined according to the concentration of the volatile gas. The sealing stability of the switch cabinet is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of energy-saving switch cabinets, and in particular to an energy-saving and environment-friendly switch cabinet. BACKGROUND

[0002] As a crucial power distribution and control device in the power grid system, the reliability, safety and energy efficiency of the long-term operation of the switch cabinet directly affect the stability of the entire power grid and the realization of the energy-saving and environment-friendly goal. With the advancement of energy-saving power grid construction, higher requirements are put forward for the intelligentization, state perception and operation self-adaptability of the switch cabinet. In terms of environmental adaptability, the insulation performance of the electrical components in the switch cabinet is extremely susceptible to humidity. At present, most switch cabinets use fixed anti-condensation heaters or periodically started and stopped heating devices to cope with humid environments. However, uniform heating may cause energy waste, and the fixed power heating may not be sufficient to offset the continuous moisture penetration pressure at the local weak points of moisture intrusion. After moisture intrusion, not only will the insulation strength be reduced, but the cooling effect caused by the moisture intrusion may also change the normal heat convection mode in the cabinet, interfering with the traditional fault judgment logic based on temperature. In addition, internal heating abnormalities will actually cause extremely subtle local deformation of the cabinet body metal cabinet, and this deformation signal is earlier than the obvious temperature rise and can be used as an early indication of failure. Therefore, there is an urgent need for an energy-saving and environment-friendly switch cabinet that can improve the energy efficiency of the device operation and prolong the service life.

[0003] Chinese Patent Publication No. CN118073999A discloses a high-voltage switch cabinet, which comprises a main cabinet, an inner cabinet, a buffer mechanism and a pressure relief mechanism. The inner cabinet is arranged in the accommodating cavity of the main cabinet, and a first accommodating groove is arranged in the inner cabinet. The groove bottom of the first accommodating groove is provided with a mounting platform for mounting a switching element. The buffer mechanism comprises a first spring and four buffer plates. The four buffer plates are enclosed around the side of the mounting platform, and the buffer plates are connected with the groove wall of the first accommodating groove through the first spring. The space enclosed by the four buffer plates and the mounting platform forms a closed buffer cavity. The switching element is located in the buffer cavity. A pressure relief port is arranged on the inner cabinet body. When the switching element fails, the high-pressure gas generated can push the buffer plates to absorb part of the energy by overcoming the elastic force of the first spring. At the same time, the high-pressure gas can push the pressure relief mechanism to open the pressure relief port, so that the high-pressure gas enters the expansion chamber from the buffer cavity for release, effectively preventing the inner cabinet body from exploding due to excessive internal pressure. It can be seen that the high-voltage switch cabinet has the problem that the organic material of the movable contact is thermally aged and decomposed under the action of the electric arc, thereby generating volatile gas, which corrodes the sealing material of the sealing part of the cabinet body of the switch cabinet, thereby accelerating the moisture intrusion during the internal pressure stabilization of the switch cabinet, and reducing the sealing performance of the switch cabinet. SUMMARY

[0004] To this end, the application provides an energy-saving and environment-friendly switch cabinet to overcome the problem that the organic material of the movable contact is thermally aged and decomposed under the action of arc, thereby generating volatile gas, and the sealability of the sealing material of the sealing part of the cabinet body of the switch cabinet is reduced, and the moisture intrusion during the internal pressure stabilization of the switch cabinet is accelerated, thereby reducing the sealability of the switch cabinet.

[0005] To achieve the above-mentioned purpose, the application provides an energy-saving and environment-friendly switch cabinet, comprising a cabinet body, further comprising: a detection module, part of which is arranged in the cabinet body, for detecting the air temperature of a plurality of temperature sampling points inside the cabinet body, the humidity value outside the cabinet body, and the volatile gas concentration inside the cabinet body, respectively; a power supply module arranged in the cabinet body, comprising a main bus and a distribution bus connected with the main bus; a switch control module connected with the power supply module, comprising a circuit breaker and a movable contact for breaking the main loop current supplied by the main bus to the distribution bus; an energy-saving and environment-friendly heat dissipation module connected with the detection module and the switch control module, respectively, for dissipating heat inside the cabinet body, comprising an exhaust fan for exhausting hot air inside the cabinet body to the outside of the cabinet body and a natural ventilation plate arranged on the side wall of the cabinet body; wherein the stop speed of the exhaust fan is determined according to the shortest straight line distance between the target humidity hidden rapid entry area and the movable contact; and the start-stop temperature threshold of the exhaust fan is determined according to the volatile gas concentration.

[0006] Further, the detection module comprises: a gas concentration sensor arranged inside the cabinet body for detecting the volatile gas concentration inside the cabinet body; a temperature sensor array arranged on the inner wall of the cabinet body for obtaining the air temperature of a plurality of temperature sampling points inside the cabinet body.

[0007] Further, the sealing area on the cabinet body with the volatile gas concentration greater than the preset concentration threshold is determined as the humidity hidden rapid entry area.

[0008] Further, the energy-saving and environment-friendly heat dissipation module determines that the moisture resistance of the sealing area to the outside of the cabinet body does not meet the requirements when the shortest straight line distance between the target humidity hidden rapid entry area and the movable contact is less than the preset straight line distance, and increases the stop speed of the exhaust fan.

[0009] Further, the stop speed and the shortest straight line distance have a negative correlation.

[0010] Further, the target humidity quick access area is determined by the internal air resistance pressure being less than the humidity air impact force.

[0011] Further, the internal air resistance pressure is a product of an average air temperature and a temperature fitting conversion coefficient.

[0012] Further, the average air temperature is a ratio of a sum of air temperatures of all temperature sampling points to a number of temperature sampling points.

[0013] Further, the humidity air impact force is calculated by the following formula: ; Wherein, F is the humidity air impact force, R is the humidity value at the humidity quick access area, L r is a humidity fitting conversion coefficient, C is the volatile gas concentration, L C is a gas concentration fitting conversion coefficient.

[0014] Further, the energy-saving and environment-friendly heat dissipation module is connected with the gas concentration sensor, so as to determine that there is a risk of corrosion of the sealing material of the sealed area caused by the volatile gas when the volatile gas concentration is greater than a preset concentration threshold, and to reduce the start-stop temperature threshold of the exhaust fan, wherein, the start-stop temperature threshold is negatively correlated with the volatile gas concentration.

[0015] Compared with the prior art, the application has the beneficial effects that: the application determines the potential humidity hidden rapid access area of the sealing area on the cabinet body with volatile gas concentration greater than the preset concentration threshold, when the volatile gas concentration is greater than the preset concentration threshold, it indicates that the movable contact generates chemically active volatile gas due to thermal aging or decomposition of the organic material of the movable contact under the action of the arc, the gas diffuses in the cabinet body and is adsorbed and permeates to the surface and interior of the sealing material of the sealing area, and the initial process of chemical corrosion of the sealing material begins, at this time, the sealing area has not occurred macroscopic sealing failure, but the material of the sealing area has entered the risk state of accelerated performance degradation, and the long-term ability of the sealing area to resist moisture penetration is weakened, so it is predicted as a future humidity hidden rapid access area, and the potential humidity hidden rapid access area of the internal air resistance air pressure less than the humidity air impact force is determined as the target humidity hidden rapid access area that needs immediate intervention, when the internal air resistance air pressure is less than the humidity molecular impact force, it indicates that at this time, the driving force of external moisture intrusion is large on the weak point where the risk of chemical corrosion of the sealing material already exists, and the net inflow of moisture is about to occur, the product of the humidity value at the humidity hidden rapid access area and the humidity fitting conversion coefficient and the sum of the product of the volatile gas concentration and the gas concentration fitting conversion coefficient are determined as the humidity air impact force of the outer surface of the cabinet body, since the moisture intrusion is a permeation process of the external humid air under the driving of pressure, the humidity fitting conversion coefficient is the humidity air impact force corresponding to the change of the unit relative humidity, which reflects the absolute level of the water vapor partial pressure in the external environment and the strength as the driving source of permeation, and the gas concentration fitting conversion coefficient is the increased corrosion area of the sealing area corresponding to the humidity air impact force corresponding to the unit volatile gas concentration, which reflects the amplification degree of the structure deformation of the surface of the cabinet body on the conduction ability of the permeation path; the product of the average temperature value and the temperature fitting conversion coefficient is determined as the internal air resistance air pressure of the cabinet body, and the temperature fitting conversion coefficient is the increment of the internal air pressure of the cabinet body corresponding to the unit temperature rise, by satisfying that the internal air resistance air pressure of the sealing area on the cabinet body with volatile gas concentration greater than the preset concentration threshold is less than the humidity air impact force, it indicates that the physical process of moisture intrusion has been catalyzed and is about to enter the interior of the cabinet body under the condition that the sealing material of the sealing area exists corrosion risk due to the volatile gas, and the position of the sealing failure of the cabinet body of the switch cabinet is further predicted, and the sensitivity of the sealing detection of the switch cabinet is improved.

[0016] Further, the present application hides the shortest straight-line distance between the target humidity and the quick access area of the moving contact, which represents the spatial efficiency of the migration path required for volatile gases to diffuse from the source, i.e., the moving contact, to the target sealed area. The shorter the distance, the faster the corrosive gas molecules can reach and act on the sealed area under the same cabinet airflow and concentration gradient. When the shortest straight-line distance is less than the preset straight-line distance, it indicates that the moving contact has undergone thermal aging due to the effect of the arc, and the physical distance of the volatile gas to the target humidity hidden quick access area is closer. The gas dissipates less during diffusion and is more likely to accumulate to a high concentration in the target humidity hidden quick access area, resulting in a higher rate and degree of chemical corrosion of the sealing material. When the energy-saving and environmentally friendly cooling module causes the exhaust fan to stop quickly, the motor of the exhaust fan is subjected to a braking torque, and the fan blade speed decreases rapidly. The rapidly decelerating fan blade does work on the air in front of it, and the air behind it still has inertia to move towards the exhaust outlet, resulting in a short-term local air pressure drop area behind the fan blade. At the same time, the decelerating fan blade produces a reverse momentum impact on the air behind it, generating a weak pressure wave that propagates into the cabinet. The air in the cabinet changes from gathering towards the exhaust outlet to temporarily flowing back from the exhaust outlet and hitting the inner wall of the cabinet. Therefore, by increasing the stopping speed of the exhaust fan, the high-humidity air layer attached to the inner wall of the cabinet and the target humidity hidden quick access area is dispersed, diluted, and pushed away, disrupting the stable volatile gas diffusion path and concentration gradient from the moving contact to the sealed area, making it difficult for corrosive gases to accumulate stably in the target area, and physically breaking the process of external moisture penetrating into the cabinet through the gap, further improving the sealing performance of the switch cabinet.

[0017] Further, the present application connects the energy-saving and environmentally friendly cooling module with the gas concentration sensor. When the volatile gas concentration detected at this time is greater than the preset concentration threshold, it indicates that the sealing material and insulating grease have undergone thermal oxidative degradation at high temperatures due to the increase in cabinet temperature, producing acidic volatile gases. The vapor pressure of volatile gases increases continuously as the temperature continues to rise, and the kinetic energy of molecules increases, making it easier to break through the surface of the sealing material and enter the gas phase. Therefore, by lowering the start-stop temperature threshold of the exhaust fan, the volatile rate of volatile gases is reduced using the exponential relationship between temperature and volatile rate, thereby controlling the temperature in the cabinet within the rubber safety range, further improving the sealing performance of the switch cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall module diagram of the energy-saving and environmentally friendly switch cabinet of the present application embodiment; Figure 2 The switch control module diagram of the energy-saving and environmentally friendly switch cabinet of the present application embodiment; Figure 3 This is a schematic diagram of the structure of the energy-saving and environmentally friendly switchgear according to an embodiment of the present invention; Figure 4 This is a logic block diagram illustrating the determination of the stopping speed of the exhaust fan in an energy-saving and environmentally friendly switchgear according to an embodiment of the present invention. Explanation of reference numerals in the attached drawings: 1-cabinet, 2-exhaust fan, 3-natural ventilation panel, 4-gas concentration sensor, 5-temperature sensor array, 6-grounding switch, 7-main busbar compartment, 8-cable compartment, 9-circuit breaker compartment, 10-relay compartment, 11-partition. Detailed Implementation

[0019] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0020] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0022] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Please see Figure 1 as well as Figure 2 The diagram shown is an overall module diagram and a switch control module diagram of an energy-saving and environmentally friendly switchgear according to an embodiment of the present invention. The energy-saving and environmentally friendly switchgear according to an embodiment of the present invention includes a cabinet body and further includes: The detection module is partially installed inside the cabinet to detect the air temperature at several temperature sampling points inside the cabinet, the humidity value outside the cabinet, and the concentration of volatile gases inside the cabinet. The power supply module, which is installed inside the cabinet, includes the main busbar and the distribution busbar connected to the main busbar; A switch control module, which is connected to the power supply module, includes a circuit breaker and a moving contact for disconnecting the main circuit current supplied from the main bus to the distribution bus; An energy-saving and environmentally friendly heat dissipation module is connected to the detection module and the switch control module respectively, and is used to dissipate heat inside the cabinet. It includes an exhaust fan for exhausting hot air inside the cabinet to the outside of the cabinet and a natural ventilation plate set on the side wall of the cabinet. The stopping speed of the exhaust fan is determined based on the shortest straight-line distance between the target humidity hiding and rapid entry area and the moving contact; the start and stop temperature threshold of the exhaust fan is determined based on the concentration of the volatile gas.

[0024] Please see Figure 3 As shown, this is a structural schematic diagram of an energy-saving and environmentally friendly switchgear according to an embodiment of the present invention. The switch control module further includes: The withdrawable circuit breaker trolley is located inside the circuit breaker compartment 9 and is used to control the overall physical opening and closing of the circuit in conjunction with the movable curtain plate. A current transformer, which is installed inside the cable compartment 8, is used to measure the circuit current and provide protection signals; A voltage transformer, located inside the cable compartment 8, is used to convert high voltage to low voltage; Grounding switch 12 is located below cabinet 1 and is used to ground the circuit during maintenance. Specifically, cabinet 1 is made of aluminum-zinc coated steel sheet.

[0025] Specifically, the cabinet 1 is equipped with several partitions 11 for realizing air circulation and heat exchange inside the cabinet 1, and the partitions 11 are all perforated and hollowed-out structures.

[0026] Specifically, a circuit breaker is a vacuum circuit breaker that is fixedly installed on a withdrawable circuit breaker trolley and is used to connect, carry, and disconnect normal and fault currents.

[0027] Specifically, the detection module includes: Gas concentration sensor 4 is installed inside the cabinet 1 to detect the concentration of volatile gases inside the cabinet 1; Temperature sensor array 5 is disposed on the inner wall of the cabinet 1 to obtain the air temperature at several temperature sampling points inside the cabinet 1.

[0028] Specifically, gas concentration sensors are installed on the inner wall of the cabinet near each sealed area of ​​the switch cabinet.

[0029] Specifically, the detection module also includes a humidity sensor (not shown in the figure) installed on the outer wall of the cabinet to obtain the humidity value of the external environment of the cabinet 1.

[0030] Specifically, the sealed area on the cabinet where the concentration of the volatile gas is greater than a preset concentration threshold is defined as the humidity-concealed and quick-entry area.

[0031] Specifically, volatile gases include, but are not limited to, methane, ethylene, acetylene, benzene, toluene, xylene, formaldehyde, acetone, formic acid, acetic acid, sulfur dioxide, hydrogen sulfide, and nitrogen oxides.

[0032] Optionally, the preset concentration threshold can be selected within a range of [10ppm, 50ppm].

[0033] Preferably, the preset concentration threshold is 20 ppm.

[0034] Please see Figure 4 As shown, it is a logic block diagram of the energy-saving and environmentally friendly switch cabinet of the present invention for determining the stopping speed of the exhaust fan. The energy-saving and environmentally friendly heat dissipation module determines that the sealing area does not meet the requirements for resisting moisture outside the cabinet when the shortest straight distance between the target humidity hiding fast entry area and the moving contact is less than the preset straight distance, and increases the stopping speed of the exhaust fan.

[0035] Specifically, the stopping speed of the exhaust fan is the ratio of the decrease in motor speed during the exhaust fan's stopping process to the duration during which the exhaust fan's speed drops to zero.

[0036] Specifically, the stopping speed is negatively correlated with the shortest straight-line distance.

[0037] Optionally, the preset straight-line distance can be selected within the range of [50mm, 100mm].

[0038] Preferably, the preset straight-line distance in the preferred embodiment is 60mm.

[0039] In implementation, when the shortest straight distance is less than the preset straight distance by less than 5mm, the stopping speed of the exhaust fan is adjusted to 1.1 times the current stopping speed of the exhaust fan. When the shortest straight distance is less than the preset straight distance by more than 5mm, the stopping speed of the exhaust fan is increased by 1r / min for every 1mm exceeding the preset straight distance. In a specific embodiment, the shortest straight distance is 54mm. When the stopping speed of the exhaust fan is 50r / min, the increased stopping speed of the exhaust fan is 50r / min×1.1+(1mm / 1mm)×1r / min=56r / min.

[0040] Specifically, the stopping speed of the exhaust fan is adjusted by the braking torque of the motor installed inside the exhaust fan.

[0041] In implementation, this invention utilizes the shortest straight-line distance between the target humidity-hidden rapid entry area and the moving contact. This shortest straight-line distance represents the spatial efficiency of the migration path required for volatile gases to diffuse from their source (the moving contact) to the target sealing area. A shorter distance means that, under the same airflow and concentration gradient within the cabinet, corrosive gas molecules can reach and act on the sealing area more quickly. When this shortest straight-line distance is less than a preset straight-line distance, it indicates that the moving contact is undergoing thermal aging under the influence of an electric arc. The physical distance for volatile gases to reach the target humidity-hidden rapid entry area is shorter, resulting in less gas dissipation during diffusion and easier accumulation in the target humidity-hidden rapid entry area, leading to a higher rate and degree of chemical erosion of the sealing material. When the exhaust fan is running normally, the air inside the cabinet is guided to the natural ventilation plate, forming stable forced convection. When the energy-saving and environmentally friendly heat dissipation module causes the exhaust fan to stop quickly, the exhaust fan's... When the motor is subjected to forced dynamic torque, the fan blade speed drops rapidly. The rapidly decelerating fan blades do significantly less work on the air in front of them. However, because the air behind them still has the inertia to move towards the exhaust vent, a brief, localized area of ​​slight pressure drop is momentarily formed behind the fan blades. At the same time, the decelerating fan blades generate a reverse momentum impact on the air behind them, producing a weak pressure wave that propagates into the cabinet. The air inside the cabinet changes from gathering towards the exhaust vent to briefly flowing back inward from the exhaust vent and impacting the inner wall of the cabinet. Therefore, by increasing the stopping speed of the exhaust fan, the high-humidity air layer adhering to the inner wall of the cabinet and the area where the target humidity is hidden and rapidly entering is dispersed, diluted, and pushed away. This disrupts the stable diffusion path and concentration gradient of volatile gases from the moving contact to the sealing area, making it difficult for corrosive gases to accumulate stably in the target area. It also physically interrupts the process of external moisture penetrating into the cabinet through gaps, further improving the sealing performance of the switch cabinet.

[0042] Specifically, the target humidity-concealing rapid entry area is defined as the area where the internal air resists air pressure less than the impact force of the humidity-sensitive air.

[0043] Specifically, the internal air resistance pressure is the product of the average air temperature and the temperature fitting conversion coefficient.

[0044] Specifically, the average air temperature is the ratio of the sum of the air temperatures at all temperature sampling points to the number of temperature sampling points.

[0045] Specifically, the formula for calculating the humidity air impact force is as follows: ; Where F represents the impact force of humid air, R represents the humidity value at the location where humidity is rapidly hidden and enters the area, and L... r Here, L is the humidity fitting conversion coefficient, C is the volatile gas concentration, and L is the volatile gas concentration.C The conversion coefficients for fitting gas concentration are denoted as .

[0046] Specifically, the humidity fitting conversion coefficient is the humidity air impact force corresponding to a unit change in relative humidity, with the unit being Pa / %.

[0047] Specifically, the gas concentration fitting conversion coefficient is the increase in corrosion area of ​​the sealed area corresponding to a unit of volatile gas concentration, and thus the corresponding humidity air impact force, in Pa / ppm.

[0048] Specifically, humid air refers to air with a relative humidity greater than 70%RH.

[0049] Specifically, the temperature fitting conversion coefficient is the increase in internal air pressure corresponding to a unit increase in temperature, with the unit being Pa / ℃.

[0050] Specifically, the humidity fitting conversion coefficient, gas concentration fitting conversion coefficient, and temperature fitting conversion coefficient were all determined through standardized permeation and thermodynamic calibration experiments on the prototype of the switchgear in a controlled environment experimental chamber.

[0051] In a specific embodiment, the current humidity level in the humidity-concealed rapid entry area is 85%RH, with a humidity fitting conversion coefficient of 0.4Pa / %. The volatile gas concentration in the humidity-concealed rapid entry area is 20ppm, with a gas concentration fitting conversion coefficient of 0.05Pa / ppm. The calculated humidity air impact force is 85%RH × 0.5Pa / % + 0.05Pa / ppm × 20ppm = 43.5Pa. The average temperature of the cabinet's internal environment is 22℃, with a temperature fitting conversion coefficient of 2.0Pa / ℃. The calculated internal air resistance pressure is 21℃ × 2.0Pa / ℃ = 42.0Pa. Comparing these figures, the humidity air impact force on the outer surface of the cabinet is greater than the internal air resistance pressure.

[0052] In implementation, this invention identifies potential moisture-infiltrating rapid entry areas in sealed areas of cabinets where the volatile gas concentration exceeds a preset threshold. When the volatile gas concentration exceeds the preset threshold, it indicates that the moving contact's organic material undergoes thermal aging or decomposition under the action of an electric arc, generating chemically active volatile gases. These gases diffuse and adsorb within the cabinet, penetrating the surface and interior of the sealing material in the sealed area, initiating the initial process of chemical erosion of the sealing material. At this point, the sealed area has not yet experienced macroscopic sealing failure, but the material in this area has entered a state of accelerated performance degradation, and the long-term resistance of the sealed area to moisture penetration is weakened. Therefore, it is predicted to be a future moisture-infiltrating rapid entry area. Thus, potential moisture-infiltrating rapid entry areas where the internal air resistance pressure is less than the impact force of the humid air are identified as target moisture-infiltrating rapid entry areas requiring immediate intervention. When the internal air resistance pressure is less than the impact force of the humid air molecules, it indicates that at this weak point where there is already a risk of chemical erosion of the sealing material, the driving force for external moisture intrusion is large, and net moisture inflow is about to occur. This is determined by multiplying the humidity value at the moisture-infiltrating rapid entry area by the humidity fitting conversion coefficient. The sum of the product of the volatile gas concentration and the gas concentration fitting conversion coefficient is determined as the humid air impact force on the outer surface of the cabinet. Since moisture intrusion is a permeation process of external humid air driven by pressure, the humidity fitting conversion coefficient is the humid air impact force corresponding to a unit change in relative humidity, reflecting the absolute level of water vapor partial pressure in the external environment and its strength as a permeation driving source. The gas concentration fitting conversion coefficient is the humid air impact force corresponding to the increased corrosion area of ​​the sealing area per unit volatile gas concentration, reflecting the amplification of the permeation path conductivity due to the structural deformation of the cabinet surface. The product of the average temperature value and the temperature fitting conversion coefficient is determined as the internal air resistance pressure of the cabinet. The temperature fitting conversion coefficient is the increase in internal air pressure corresponding to a unit temperature increase. By satisfying that the internal air resistance pressure at the sealing area of ​​the cabinet where the volatile gas concentration is greater than the preset concentration threshold is less than the humid air impact force, it is indicated that under the condition that the sealing material of the sealing area is at risk of corrosion due to volatile gases, the physical process of moisture intrusion has been catalyzed and is about to enter the cabinet. This further predicts the location of the switch cabinet's cabinet seal failure and improves the sensitivity of the switch cabinet's seal detection.

[0053] Specifically, the energy-saving and environmentally friendly heat dissipation module is connected to the gas concentration sensor to determine, based on the volatile gas concentration exceeding a preset concentration threshold, the risk of corrosion of the sealing material in the sealed area caused by the volatile gas, and to reduce the start-stop temperature threshold of the exhaust fan. The start-stop temperature threshold is negatively correlated with the concentration of volatile gases.

[0054] Specifically, the start-stop temperature threshold of the exhaust fan is used to measure the maximum allowable air temperature inside the switch cabinet.

[0055] Specifically, the initial start-stop temperature threshold for the exhaust fan is 60°C.

[0056] In practice, when the concentration of volatile gases is within 2 ppm of the preset concentration threshold, the start-stop temperature threshold of the exhaust fan is adjusted to 95% of the current start-stop temperature threshold. When the concentration of volatile gases exceeds the preset concentration threshold by more than 2 ppm, the start-stop temperature threshold of the exhaust fan is reduced by 1°C for every 1 ppm exceeding the threshold. In a specific embodiment, the concentration of volatile gases is 24 ppm, the start-stop temperature threshold of the exhaust fan is 60°C, and the reduced start-stop temperature threshold of the exhaust fan is 60°C × 95% - (2 ppm / 1 ppm) × 1°C = 55°C.

[0057] In implementation, this invention connects the energy-saving and environmentally friendly heat dissipation module to the gas concentration sensor. When the concentration of volatile gas detected is greater than the preset concentration threshold, it indicates that due to the increase in cabinet temperature, the sealing material and insulating grease undergo thermal oxidation degradation at high temperature, producing acidic volatile gas. As the temperature continues to rise, the vapor pressure of the volatile gas will continue to increase, and the kinetic energy of the molecules will increase, making it easier to break through the surface binding of the sealing material and enter the gas phase. Therefore, by reducing the start-stop temperature threshold of the exhaust fan, the evaporation rate of the volatile gas is reduced by utilizing the exponential relationship between temperature and the evaporation rate of the volatile gas, thereby controlling the cabinet temperature within the rubber safety range and further improving the sealing performance of the switchgear.

[0058] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An energy-saving and environmentally friendly switch cabinet, comprising a cabinet body, characterized in that, Also includes: The detection module is partially installed inside the cabinet to detect the air temperature at several temperature sampling points inside the cabinet, the humidity value outside the cabinet, and the concentration of volatile gases inside the cabinet. The power supply module, which is installed inside the cabinet, includes the main busbar and the distribution busbar connected to the main busbar; A switch control module, which is connected to the power supply module, includes a circuit breaker and a moving contact for disconnecting the main circuit current supplied from the main bus to the distribution bus; An energy-saving and environmentally friendly heat dissipation module is connected to the detection module and the switch control module respectively, and is used to dissipate heat inside the cabinet. It includes an exhaust fan for exhausting hot air inside the cabinet to the outside of the cabinet and a natural ventilation plate set on the side wall of the cabinet. The stopping speed of the exhaust fan is determined based on the shortest straight-line distance between the target humidity hiding and rapid entry area and the moving contact; the start and stop temperature threshold of the exhaust fan is determined based on the concentration of the volatile gas.

2. The energy-saving and environmentally friendly switchgear according to claim 1, characterized in that, The detection module includes: A gas concentration sensor is installed inside the cabinet to detect the concentration of volatile gases inside the cabinet. A temperature sensor array is installed on the inner wall of the cabinet to detect the air temperature at several temperature sampling points inside the cabinet.

3. The energy-saving and environmentally friendly switchgear according to claim 2, characterized in that, The sealed area on the cabinet where the concentration of volatile gas is greater than a preset concentration threshold is defined as a humidity-concealed, fast-entry area.

4. The energy-saving and environmentally friendly switchgear according to claim 3, characterized in that, The energy-saving and environmentally friendly heat dissipation module determines that the sealing area's resistance to external moisture is insufficient if the shortest straight-line distance between the target humidity hiding and fast entry area and the moving contact is less than the preset straight-line distance, and then increases the stopping speed of the exhaust fan.

5. The energy-saving and environmentally friendly switchgear according to claim 4, characterized in that, The stopping speed is negatively correlated with the shortest straight-line distance.

6. The energy-saving and environmentally friendly switchgear according to claim 5, characterized in that, The target humidity-concealing rapid entry area is defined as the area where the internal air resists the impact force of air with a pressure lower than that of the humidity-sensitive air.

7. The energy-saving and environmentally friendly switchgear according to claim 6, characterized in that, The internal air resistance pressure is the product of the average air temperature and the temperature fitting conversion coefficient.

8. The energy-saving and environmentally friendly switchgear according to claim 7, characterized in that, The average air temperature is the ratio of the sum of the air temperatures at all temperature sampling points to the number of temperature sampling points.

9. The energy-saving and environmentally friendly switchgear according to claim 8, characterized in that, The formula for calculating the humidity-induced air impact force is: ； Where F represents the impact force of humid air, R represents the humidity value at the location where humidity is hidden and rapidly enters, and L... r Here, L is the humidity fitting conversion coefficient, C is the volatile gas concentration, and L is the volatile gas concentration. C The conversion coefficients for fitting gas concentration are denoted as .

10. The energy-saving and environmentally friendly switchgear according to claim 9, characterized in that, The energy-saving and environmentally friendly heat dissipation module is connected to the gas concentration sensor to determine, based on the volatile gas concentration exceeding a preset concentration threshold, the risk of corrosion of the sealing material in the sealed area caused by the volatile gas, and to reduce the start-stop temperature threshold of the exhaust fan. The start-stop temperature threshold is negatively correlated with the concentration of volatile gases.

Images