CN112421444A - Prevent electrical switchgear of condensation - Google Patents
Prevent electrical switchgear of condensation Download PDFInfo
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- CN112421444A CN112421444A CN202011192034.7A CN202011192034A CN112421444A CN 112421444 A CN112421444 A CN 112421444A CN 202011192034 A CN202011192034 A CN 202011192034A CN 112421444 A CN112421444 A CN 112421444A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Patch Boards (AREA)
Abstract
The invention discloses an anti-condensation electrical switch cabinet, which comprises a switch cabinet, a secondary chamber positioned at the upper part of the switch cabinet and a cable chamber positioned at the lower part of the switch cabinet; a cable trench is arranged below the cable chamber; a closed box integrated with an environment regulation and control system is fixedly covered outside the switch cabinet. According to the invention, an environment regulation and control system combining a fan, a temperature and humidity sensor and the like is integrated on the closed box, and the air quantities of fresh air, return air and exhaust air are automatically adjusted by monitoring the state parameters inside the closed box, outside the box and in a cable trench, so that the invasion of a large amount of hot and humid air outside the box is prevented, the inside of the box is kept dry, the temperature is uniform, and the occurrence of condensation is thoroughly avoided; the electric cabinet can effectively control temperature and humidity parameters in the switch cabinet, eliminate factors generated by condensation, reduce the risk of the switch cabinet that the condensation breaks down, obviously reduce the operation energy consumption of an environment regulation and control system, effectively improve the operation environment of electrical equipment, obviously reduce the maintenance workload, and improve the intelligent level of environment control.
Description
Technical Field
The invention relates to an anti-condensation electrical switch cabinet, and belongs to the technical field of electrical equipment.
Background
The air in question is normally humid air consisting of dry air and water vapour. The existing form of water mainly depends on temperature and pressure, liquid water gradually changes to a gaseous state when the temperature is increased or the pressure is reduced, and conversely, the gaseous water changes to a liquid state when the temperature is reduced or the pressure is increased. Thus, condensation is actually the result of the transition of moisture in the air from a vapor state to a liquid state. When the surface temperature of an object contacted by wet air is lower than the temperature of the air, the air transfers heat to the contacted object, the temperature of the air is reduced, the partial pressure of water is increased, the surface temperature of the object is increased, but the two increasing rates are different, the heat capacity of the air is low, and the temperature reduction rate is higher than the temperature increase rate of the solid object after heat absorption. When the temperature of the air is reduced to the boiling temperature of water under the partial pressure of water vapor, the water vapor is separated out from the air in a liquid state, and condensation is formed on the surface of an object.
In a power distribution room in a humid area, because of large humidity and large environmental temperature change, the bottom of an electrical switch cabinet is often humid, and accumulated water even exists in some cable trenches; the electric switch cabinet is arranged in a basement, and the temperature in the cabinet body, particularly the temperature close to the ground, is higher than the ambient temperature due to the higher humidity of the environment; some equipment is in a temporary shutdown state, and the temperature of the small environment in the electric cabinet is higher than that of the surrounding environment. The totality can be summarized as: when the high-temperature and high-humidity environment meets cold equipment, condensation is easily formed on the surface of the equipment. Particularly in winter, the temperature in the electric switch cabinet is higher than the ambient temperature due to the large environmental temperature difference, and the humidity in winter is also large, so that the probability of forming condensation is higher. In this case, once the power transmission is put into operation, an accident follows.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an anti-condensation electric switch cabinet, which can effectively control temperature and humidity parameters in the electric switch cabinet, eliminate factors generated by condensation, reduce the risk of the closed box failing due to condensation, and obviously reduce the energy consumption of a microenvironment control system in operation.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
an anti-condensation electrical switch cabinet comprises a switch cabinet, a secondary chamber positioned at the upper part of the switch cabinet and a cable chamber positioned at the lower part of the switch cabinet; a cable trench is arranged below the cable chamber;
a closed box integrated with an environment regulation and control system is fixedly covered outside the switch cabinet.
Furthermore, the closed box is formed by fixedly combining double-layer box plates, and fireproof heat-insulating cotton is filled in an interlayer of each double-layer box plate.
Further, the environment regulation and control system comprises a double-flow fan and a lower air duct fan which are fixedly connected to one side of the closed box, an air inlet valve which is communicated with air inlets of the double-flow fan and the lower air duct fan and the outside of the closed box, a controller which is in control connection with the double-flow fan and the lower air duct fan, a closed box top temperature and humidity sensor, a switch cabinet lower temperature and humidity sensor, a cable duct inner temperature and humidity sensor and an outdoor temperature and humidity sensor which are respectively arranged on the inner side of the top of the closed box, the top of the switch cabinet, the lower part of the switch cabinet, the inside of the cable duct and an air inlet part of the air inlet valve, an air return valve which is communicated with the double-flow fan, a lower air pipe which is communicated with an;
the air outlet of the double-flow fan is positioned on the inner side of the closed box, the port of the lower air pipe is positioned in the cable trench, and the air return valve at the bottom of the box is communicated with the cable trench.
Further, data output ends of a temperature and humidity sensor at the top of the closed box, a temperature and humidity sensor at the top of the switch cabinet, a temperature and humidity sensor at the lower part of the switch cabinet, a temperature and humidity sensor in the cable duct and an outdoor temperature and humidity sensor are all in transmission connection with the controller;
furthermore, air outlets are fixedly arranged on two sides of the top of the closed box.
Further, the controller adopts an STMF serial ARM single chip microcomputer.
Further, the controller collects the temperature and humidity data of corresponding points according to the temperature and humidity sensor at the top of the closed box, the temperature and humidity sensor at the top of the switch cabinet, the temperature and humidity sensor at the lower part of the switch cabinet, the temperature and humidity sensor in the cable trench and the temperature and humidity data of corresponding points at the outside of the switch cabinet, the double-flow fan and the lower air duct fan are controlled to start and stop, the air inlet valve, the air return valve at the bottom of the box and the air outlet are respectively controlled to be opened and closed, the air supply modes of the two fans are switched, the control of accumulated water in the closed box and the control of external condensation of the switch cabinet, the control of condensation.
Further, the control process of the condensation water accumulated inside the closed box and outside the switch cabinet is as follows:
when the temperature of the top of the closed box is higher than the external temperature of the closed box and exceeds 25 ℃, the controller controls the double-flow fan to be started; if the humidity outside the closed box is lower than 85%, the air inlet valve is opened, the air return valve is closed, the double-flow fan is in an external air inlet mode when being opened, hot air at the top of the closed box is discharged, the temperature difference between the inside and the outside of the closed box and the switch cabinet is reduced, and the condensation condition between the inner wall of the closed box and the outside of the switch cabinet is damaged;
if the temperature of the top of the closed box is always lower than 25 ℃, the controller starts the double-flow fan every two hours at regular time, and the external air enters the closed box to operate for a period, so that the internal and external temperatures of the closed box are balanced;
when the outside humidity of seal box is higher than 85% or the temperature is higher than seal box top temperature, the air inlet valve is closed, and the return air valve is opened, and the inner loop mode is opened to the double-flow fan, prevents that outdoor high temperature and high humidity air from getting into in the seal box to destroy in the seal box and the outside condensation condition of cubical switchboard, reduce the difference in temperature about in the seal box simultaneously.
Further, the secondary chamber condensation prevention control process is as follows:
when the temperature of the top of the closed box exceeds 25 ℃ or the temperature difference between the top of the closed box and the temperature of the top surface of the switch cabinet exceeds 2 ℃, the double-flow fan is started to supply air alternately from left to right;
if the external temperature of the closed box is lower than the top temperature of the closed box and the external humidity of the closed box is lower than 85%, the air inlet valve is opened, the air return valve is closed, the double-flow fan is in an external air inlet mode when being opened, hot air at the top of the closed box is discharged, and the temperature difference between the inside and the outside of the closed box is reduced, so that the temperature difference between the inside of the closed box and the inside of a secondary chamber is reduced, and the condensation condition of the secondary chamber is damaged;
when the temperature of the top of the closed box exceeds 45 ℃, periodically starting the double-flow fan, quickly discharging hot air at the top of the closed box, and exiting the mode until the temperature of the top of the closed box is lower than 42 ℃;
when the outside humidity of the closed box is higher than 85% or the temperature is higher than the temperature of the top of the closed box, the air inlet valve is closed, the air return valve is opened, the double-flow fan opens the internal circulation mode, the condition that outdoor high-temperature high-humidity air enters the box to damage condensation of a secondary chamber is prevented, and the temperature difference between the upper part and the lower part of the closed box is reduced.
Further, when the temperature in the cable trench is 1 ℃ lower than the temperature of the lower part of the switch cabinet, a lower air duct fan is started to increase the temperature of the cable trench, so that the temperature in the cable trench is balanced with the temperature of the lower part of the switch cabinet;
when the humidity in the cable trench is lower than 85%, the return air valve at the bottom of the cable trench is opened, air in the cable trench enters the closed box, if the air inlet valve is in an open state at the moment, high-temperature air at the top of the closed box is removed, and if the air inlet valve is in a closed state at the moment, the air in the closed box and the air in the cable trench are integrated, so that the temperature in the ring main unit and the temperature in the cable trench are balanced;
and when the humidity in the cable trench exceeds 90%, the lower air duct fan is started, the air inlet valve is opened, the return air valve at the bottom of the cable trench is closed, and high-humidity air in the cable trench is discharged from the bypass of the cable trench until the humidity of the cable trench is lower than 85%, and the normal mode is recovered.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the environment regulation and control system combining the fan, the control valve, the temperature and humidity sensor and the like is integrated on the closed box, and the air quantities of fresh air (air inlet outside the closed box), return air (air in the area inside the closed box) and exhaust air (hot and humid air at the top of the closed box) are automatically regulated by monitoring the state parameters inside the closed box, outside the closed box and in a cable trench, so that the invasion of a large amount of hot and humid air outside the closed box is prevented, the inside of the closed box is kept dry, the temperature is uniform, and the occurrence of condensation is thoroughly avoided; temperature and humidity parameter in can controlling the electrical switchgear effectively, the factor that the condensation produced is eliminated, reduces the risk that the seal box broke down because of the condensation, and environment regulation and control system carries out intelligent control to the microenvironment, and the operation energy consumption is showing and is descending, and electrical equipment operational environment is effectively improved, and the maintenance work volume is showing and is reducing, and environmental control's intelligent level obtains improving.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the sandwich structure in the enclosure of the present invention;
FIG. 3 is a block diagram illustrating the control of condensation and water accumulation inside the enclosure and outside the switch cabinet according to the present invention;
FIG. 4 is a block diagram of the secondary chamber condensation control concept of the present invention;
FIG. 5 is a schematic block diagram of the anti-condensation control of the cord house of the present invention;
fig. 6 is a schematic diagram of a dual flow fan control circuit of the present invention.
Wherein:
10 switch cabinets, 11 closed boxes, 12 lower air duct fans, 13 lower air ducts, 14 cable ditches, 15 box bottom return air valves, 16 double-flow fans, 17 controllers, 18 outdoor temperature and humidity sensors, 19 air inlet valves, 20 return air valves, 21 closed box top temperature and humidity sensors, 22 air outlets, 23 switch cabinet top temperature and humidity sensors, 24 switch cabinet lower temperature and humidity sensors, 25 cable ditch temperature and humidity sensors, 26 secondary chambers, 27 cable chambers, 28 double-layer box plates and 29 fireproof heat insulation cotton.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting.
Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
At present, the following measures for preventing condensation of the electrical switch cabinet are provided.
And (5) simply sealing.
To prevent dust and insects from entering the cabinet, limited sealing of the cabinet is employed. However, the sealed box body destroys the convection condition required for heat dissipation, and stagnant air which cannot circulate forms a stagnant layer on the surface of equipment or elements, and the stagnant layer is equivalent to a thermal insulation layer and can have extremely adverse effect on the heat dissipation of the equipment or elements, which is also an important reason that some indoor protective screens are still overheated even if the air conditioner lowers the room temperature to a low level.
Because the box body is not tightly sealed, the internal air expands with heat and contracts with cold to cause breathing phenomenon, particularly, under the condition of no breathing hole, dust and dirt easily enter the box body along with unfiltered air in a disordered way through a gap and are deposited at each part of the box body, and the design of the box body has no self-purification capacity, so that the bad conditions of dust and dirt accumulation exist in the box body; the ash contains a large amount of metal microparticles, metal oxides and various acidic substances, and can become an important material condition for corrosion, insulation damage and even pollution flashover failure of electrical components in the box.
And (5) lifting (padding) the ground foundation of the newly-built power distribution room.
The ground foundation is lifted (padded) by more than 0.4 m, so that the influence of moisture formed by underground water on the ground of the power distribution room and a cable trench is effectively improved, and the power distribution room is ensured to be in a dry operating environment. Although effective, civil engineering measures are difficult to implement for older buildings.
And adding a ventilation device.
For a part of cabinets with heat sources inside, the existing measures are to arrange air inlet and outlet holes on one surface of the cabinet or install a small and miniature fan for ventilation. However, due to the randomness of installation of equipment and components inside the cabinet and the uncertainty of air flow channels and spaces, the expected effect of the ventilation and heat dissipation mode is difficult to achieve due to the existence of a large number of dead corners or disordered turbulence, and a more serious problem is caused by the large amount of entering of dust and humid air.
And (4) heating and dehumidifying.
The normal or intermittent (temperature control or humidity control) electric heater is the dehumidification and humidity reduction measure commonly adopted by the existing electric switch cabinet.
The mechanism of operation is to reduce the relative humidity by heating the air to increase the moisture capacity (i.e., the ability to hold and absorb water vapor) of the air. However, in the existing various cabinets, the application randomness of the heater is increased, and if a scientific control method is lacked in the using process, certain adverse results can be generated sometimes:
firstly, the cabinet body is in a closed state, the air in the cabinet body is in a static state, no air convection exists in the cabinet body, the heater is mainly used for heating the air through conduction and radiation, the heating of the heater to the air is local, uneven and incomplete, a large temperature gradient and a cold-hot interface are formed in the cabinet body, and the possibility of condensation is increased;
secondly, the inside of the cabinet body is lack of a discharging and escaping channel containing humid air, and the lower part of the cabinet body is provided with a cable duct for continuously replenishing water vapor. The heated air absorbs more moisture and is retained in the cabinet body, the higher the heating temperature is, the more water vapor is absorbed and retained, once the air temperature in the cabinet body is slightly reduced, the air is quickly saturated, and conditions are provided for air condensation;
the third is because the use of heater for the internal portion temperature of cabinet is often higher than the external portion of cabinet, produces apparent temperature difference at the internal wall of cabinet, because the cabinet body is made by the better metal material of heat conductivility, and its internal wall forms cold surface, becomes another important condition of condensation, then a large amount of, continuous condensation process just can't avoid, and the internal local ponding phenomenon still can take place even of cabinet under the severe condition. Once the two effects of dust deposition, dirt deposition and continuous condensation in the cabinet body are superposed, the probability of pollution flashover and insulation fault in the cabinet is greatly improved, and the safe operation of the electrical equipment is seriously threatened.
It follows that the effect of an unreasonable use of a heater is almost irreparable. In addition, there are cases where a small-sized air conditioner is installed in an electrical switchgear. The small-sized air conditioner can only form local convection, the temperature gradient and the uneven distribution degree of a thermal field can be increased due to excessive cooling, a lot of cold surfaces can be formed at the place where cold air is directly blown to promote condensation, and the effect is unreliable. Moreover, the mode is difficult to be accepted by the market due to high investment, low efficiency, large energy consumption and poor cost-efficiency ratio.
As shown in the figures 1-6 of the drawings,
the embodiment provides a device for preventing condensation of an electrical switch cabinet in a wet area, which comprises a switch cabinet 10, a secondary chamber 26 positioned at the upper part of the switch cabinet 10 and a cable chamber 27 positioned at the lower part of the switch cabinet 10; a cable trench 14 is arranged below the cable chamber 27;
a closed box 21, which is integrated with an environment control system, is arranged on the outer fixed cover of the switch cabinet 10.
Further, the closed box 21 is formed by fixedly combining double-layer box plates 28, and fireproof heat insulation cotton 29 is filled in an interlayer of the double-layer box plates 28.
Further, the environment regulation and control system comprises a double-flow fan 16 and a lower air duct fan 12 which are fixedly connected to one side of a closed box 21, an air inlet valve 19 which is communicated with air inlets of the double-flow fan 16 and the lower air duct fan 12 and the outside of the closed box 21, a controller 17 which is in control connection with the double-flow fan 16 and the lower air duct fan 12, a closed box top temperature and humidity sensor 21, a switch cabinet top temperature and humidity sensor 23, a switch cabinet lower temperature and humidity sensor 24, a cable duct internal temperature and humidity sensor 25 and an outdoor temperature and humidity sensor 18 which are respectively arranged on the inner side of the top of the closed box 11, the top of the switch cabinet 23, the lower part of the switch cabinet 14 and an air inlet part of the air inlet valve 19, an air return pipe 20 communicated with the double-flow fan 16, a lower air duct 13 communicated with an air outlet of the lower air duct fan 12 and a box bottom air return;
the air outlet of the double-flow fan 16 is positioned on the inner side of the closed box 21, the port of the lower air pipe 13 is positioned in the cable trench 14, and the box bottom air return valve 15 is communicated with the cable trench 14.
Further, data output ends of the closed box top temperature and humidity sensor 21, the switch cabinet top temperature and humidity sensor 23, the switch cabinet lower temperature and humidity sensor 24, the cable trench inner temperature and humidity sensor 25 and the outdoor temperature and humidity sensor 18 are all in transmission connection with the controller 17;
further, air outlets 22 are fixedly arranged on two sides of the top of the closed box 11.
Further, the controller 17 adopts an STM32F103 series 32-bit ARM single chip microcomputer.
Further, the controller 17 collects temperature and humidity data of corresponding points according to a closed box top temperature and humidity sensor 21, a switch cabinet top temperature and humidity sensor 23, a switch cabinet lower portion temperature and humidity sensor 24, a cable trench internal temperature and humidity sensor 25 and an outdoor temperature and humidity sensor 18, controls starting and stopping of the double-flow fan 16 and the lower air duct fan 12, and controls opening and closing of the air inlet valve 19, the air return valve 20, the box bottom air return valve 15 and the air outlet 22 respectively, so that air supply modes of the two fans are switched, condensation water accumulation control in the closed box and outside the switch cabinet, condensation control in a secondary chamber and condensation control in a cable chamber are achieved.
Further, the control process of the condensation water accumulated inside the closed box and outside the switch cabinet is as follows:
when the temperature of the top of the closed box is higher than the external temperature of the closed box and exceeds 25 ℃, the controller 17 controls the double-flow fan 16 to be started; if the humidity outside the closed box is lower than 85%, the air inlet valve 19 is opened, the air return valve 20 is closed, the double-flow fan 16 is in an external air inlet mode when being opened, hot air at the top of the closed box is discharged, the temperature difference between the inside and the outside of the closed box 11 and the switch cabinet 10 is reduced, and the condensation condition between the inner wall of the closed box 11 and the outside of the switch cabinet 10 is damaged;
if the temperature of the top of the closed box is always lower than 25 ℃, the controller 17 starts the double-flow fan 16 every two hours at regular time, and the external air enters the closed box and runs for a period, so that the internal temperature and the external temperature of the closed box 11 are balanced;
when the external humidity of the closed box is higher than 85% or the temperature is higher than the temperature of the top of the closed box, the air inlet valve 19 is closed, the air return valve 20 is opened, the double-flow fan 16 opens an internal circulation mode, outdoor high-temperature high-humidity air is prevented from entering the closed box 10, accordingly, the condensation conditions between the inside of the closed box and the outside of the switch cabinet are damaged, and the vertical temperature difference between the inside of the closed box 10 and the outside of the switch cabinet is reduced.
Further, the secondary chamber condensation prevention control process is as follows:
when the temperature of the top of the closed box exceeds 25 ℃ or the temperature difference between the top of the closed box and the temperature of the top surface of the switch cabinet exceeds 2 ℃, the double-flow fan 16 is started to supply air alternately from left to right;
if the external temperature of the closed box is lower than the top temperature of the closed box and the external humidity of the closed box is lower than 85%, the air inlet valve 19 is opened, the air return valve 20 is closed, the double-flow fan 16 is in an external air inlet mode when being opened, hot air at the top of the closed box is discharged, and the temperature difference between the inside and the outside of the closed box is reduced, so that the temperature difference between the inside of the closed box and the inside of a secondary chamber is reduced, and the condensation condition of the secondary chamber is damaged;
when the temperature of the top of the closed box exceeds 45 ℃, the double-flow fan 16 is periodically started to quickly exhaust the hot air at the top of the closed box, and the mode is exited until the temperature of the top of the closed box is lower than 42 ℃;
when the humidity outside the closed box is higher than 85% or the temperature is higher than the temperature of the top of the closed box, the air inlet valve 19 is closed, the air return valve 20 is opened, the double-flow fan 16 starts an internal circulation mode, outdoor high-temperature and high-humidity air is prevented from entering the box to damage condensation conditions of a secondary chamber, and the vertical temperature difference in the closed box is reduced.
Further, when the temperature in the cable trench 14 is lower than the temperature of the lower part of the switch cabinet by 1 ℃, the lower air duct fan 12 is started to increase the temperature of the cable trench, so that the temperature in the cable trench is balanced with the temperature of the lower part of the switch cabinet;
when the humidity in the cable trench 14 is lower than 85%, the air return valve 15 at the bottom of the cable trench is opened, air in the cable trench enters the closed box 11, if the air inlet valve 19 is in an open state at the moment, high-temperature air at the top of the closed box is removed, and if the air inlet valve is in a closed state at the moment, the air in the closed box and the air in the cable trench are integrated, so that the temperature in the ring main unit and the temperature in the cable trench are balanced;
and when the humidity in the cable trench exceeds 90%, the lower air duct fan 12 is started, the air inlet valve is opened, the box bottom air return valve 15 is closed, and high-humidity air in the cable trench is discharged from the bypass of the cable trench until the humidity of the cable trench is lower than 85%, and the normal mode is recovered.
According to the analysis of the condensation mechanism, the invention analyzes and summarizes that the main factors of the condensation generated in the electrical switch cabinet are the entering of external humid air and the temperature difference formed by the air in the box and the wall surface of the cabinet body. An environment regulation and control system is adopted as a core, and an intelligent control system is constructed by combining a temperature and humidity sensor, a control air valve, a controller and the like to form microenvironment control regulation and control in a closed box. Through the application in the engineering, show that this regulator cubicle can control temperature and humidity parameter in the cubical switchboard effectively, eliminate the factor that the condensation produced, reduce the cubical switchboard because of the risk that the condensation breaks down, the environmental conditioning system operation energy consumption is showing and is descending, and electrical equipment operational environment is effectively improved, and the maintenance work volume is showing and is reducing, and the intelligent level of environmental control obtains improving.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; it is obvious as a person skilled in the art to combine several aspects of the invention. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An electrical switch cabinet capable of preventing condensation comprises a switch cabinet (10), a secondary chamber (26) positioned at the upper part of the switch cabinet (10) and a cable chamber (27) positioned at the lower part of the switch cabinet (10); a cable trench (14) is arranged below the cable chamber (27);
the method is characterized in that: a closed box (21) integrated with an environment regulation and control system is fixedly covered outside the switch cabinet (10).
2. The electrical switchgear of claim 1, wherein: the closed box (21) is formed by fixedly combining double-layer box plates (28), and fireproof heat-insulating cotton (29) is filled in an interlayer of the double-layer box plates (28).
3. The electrical switchgear of claim 2, wherein: the environment control system comprises a double-flow fan (16) and a lower air duct fan (12) which are fixedly connected to one side of a closed box (21), an air inlet valve (19) outside the closed box (21) and communicated with the double-flow fan (16) and the lower air duct fan (12), a controller (17) connected with the double-flow fan (16) and the lower air duct fan (12) in a control mode, the double-flow fan and the lower air duct fan are arranged on the inner side of the top of the closed box (11), the top of a switch cabinet (23), the lower portion of the switch cabinet (23), the inside of the cable duct (14) and the air inlet portion of the air inlet valve (19) of the closed box top temperature and humidity sensor (21), the top temperature and humidity sensor (23) of the switch cabinet, the lower portion temperature and humidity sensor (24) of the cable duct, the temperature and humidity sensor (25) and the outdoor temperature and humidity sensor (18) in the cable duct, an air return valve (20) communicated with the double-flow fan (16), a lower air A box bottom air return valve (15);
the air outlet of the double-flow fan (16) is positioned on the inner side of the closed box (21), the port of the lower air pipe (13) is positioned in the cable trench (14), and the box bottom air return valve (15) is communicated with the cable trench (14).
4. An anti-condensation electrical switchgear according to claim 3, characterized in that: and the data output ends of the closed box top temperature and humidity sensor (21), the switch cabinet top temperature and humidity sensor (23), the switch cabinet lower part temperature and humidity sensor (24), the cable trench inner temperature and humidity sensor (25) and the outdoor temperature and humidity sensor (18) are all in transmission connection with the controller (17).
5. The electrical switchgear of claim 4, wherein: air outlets (22) are fixedly arranged on two sides of the top of the closed box (11).
6. The electrical switchgear of claim 5, wherein: the controller (17) adopts an STM32F103 series 32-bit ARM single chip microcomputer.
7. The electrical switchgear of claim 6, wherein: the controller (17) gathers the temperature and humidity data of corresponding position according to seal roof portion temperature and humidity sensor (21), cubical switchboard top temperature and humidity sensor (23), cubical switchboard lower part temperature and humidity sensor (24), temperature and humidity sensor (25) and outdoor temperature and humidity sensor (18) in the cable pit, control opening and shutting of double-flow fan (16) and lower air duct fan (12), and control air inlet valve (19) respectively, return-air valve (20), the switching of bottom of the case return-air valve (15) and air exit (22), thereby switch the air feed mode of two fans, realize sealing the incasement and the outside condensation ponding control of cubical switchboard, condensation control is prevented in the secondary room and cable chamber prevents condensation control.
8. The electrical switchgear of claim 7, wherein: the control process of the condensation water accumulation in the closed box and outside the switch cabinet is as follows:
when the temperature of the top of the closed box is higher than the external temperature of the closed box and exceeds 25 ℃, the controller (17) controls the double-flow fan (16) to be started; if the humidity outside the closed box is lower than 85%, the air inlet valve (19) is opened, the air return valve (20) is closed, the double-flow fan (16) is in an external air inlet mode when being opened, hot air at the top of the closed box is discharged, the temperature difference between the inside and the outside of the closed box (11) and the switch cabinet (10) is reduced, and the condensation condition between the inner wall of the closed box (11) and the outside of the switch cabinet (10) is damaged;
if the temperature of the top of the closed box is always lower than 25 ℃, the controller (17) starts the double-flow fan (16) every two hours at regular time, and the external air enters the closed box and runs for a period, so that the internal temperature and the external temperature of the closed box (11) are balanced;
when the external humidity of the closed box is higher than 85% or the temperature is higher than the temperature of the top of the closed box, the air inlet valve (19) is closed, the air return valve (20) is opened, the internal circulation mode is opened by the double-flow fan (16), outdoor high-temperature high-humidity air is prevented from entering the closed box (10), the condensation condition between the inside of the closed box and the outside of the switch cabinet is damaged, and the temperature difference between the inside of the closed box (10) and the outside of the switch cabinet is reduced.
9. The electrical switchgear of claim 7, wherein: the secondary chamber condensation prevention control process is as follows:
when the temperature of the top of the closed box exceeds 25 ℃ or the temperature difference between the top of the closed box and the temperature of the top surface of the switch cabinet exceeds 2 ℃, the double-flow fan (16) is started to supply air alternately from left to right;
if the external temperature of the closed box is lower than the top temperature of the closed box and the external humidity of the closed box is lower than 85%, the air inlet valve (19) is opened, the air return valve (20) is closed, and the double-flow fan (16) is in an external air inlet mode when opened, so that hot air at the top of the closed box is discharged, the temperature difference between the inside and the outside of the closed box is reduced, the temperature difference between the inside of the closed box and the inside of a secondary chamber is reduced, and the condensation condition of the secondary chamber is damaged;
when the temperature of the top of the closed box exceeds 45 ℃, the double-flow fan (16) is periodically started to quickly exhaust the hot air at the top of the closed box until the temperature of the top of the closed box is lower than 42 ℃, and the mode is exited;
when the external humidity of the closed box is higher than 85% or the temperature of the external humidity of the closed box is higher than the temperature of the top of the closed box, the air inlet valve (19) is closed, the air return valve (20) is opened, the double-flow fan (16) is started in an internal circulation mode, outdoor high-temperature high-humidity air is prevented from entering the box to damage the condensation condition of a secondary chamber, and the vertical temperature difference in the closed box is reduced.
10. The electrical switchgear of claim 7, wherein: the condensation prevention control process of the cable chamber is as follows:
when the temperature in the cable trench (14) is 1 ℃ lower than the temperature of the lower part of the switch cabinet, a lower air duct fan (12) is started to increase the temperature of the cable trench, so that the temperature in the cable trench is balanced with the temperature of the lower part of the switch cabinet;
when the humidity in the cable trench (14) is lower than 85%, the air return valve (15) at the bottom of the cable trench is opened, air in the cable trench enters the inside of the closed box (11), if the air inlet valve (19) is in an open state at the moment, high-temperature air at the top of the closed box is removed, and if the air inlet valve is in a closed state at the moment, the air in the closed box and the air in the cable trench are integrated, so that the temperature in the ring main unit and the temperature in the cable trench are balanced;
when the humidity in the cable trench exceeds 90%, a lower air duct fan (12) is started, an air inlet valve is opened, a box bottom air return valve (15) is closed, high-humidity air in the cable trench is discharged from a cable trench bypass until the humidity of the cable trench is lower than 85%, and a normal mode is recovered.
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| CN114923272A (en) * | 2022-05-24 | 2022-08-19 | 广东电网有限责任公司 | High-voltage switch cabinet and temperature and humidity control method |
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