Dehumidification device and dehumidification method applied to interior of switch cabinet

Abstract

The invention relates to a dehumidification device and method applied to the interior of a switch cabinet, the dehumidification device comprises a forced commutation assembly, a condensation assembly, a diversion assembly, a thermometer, a hygrometer and a controller, one end of the diversion assembly is connected with the condensation assembly, and the other end of the diversion assembly extends to the exterior of the switch cabinet; the dehumidification method comprises the following steps: calculating the water yield of condensate water under different temperatures and dehumidification requirements in the switch cabinet to obtain a curve graph; and the current temperature and the current dehumidification demand in the switch cabinet are obtained, and the processor compares and adjusts the water yield in the curve graph corresponding to the current temperature and the current dehumidification demand with the water yield after the forced commutation assembly works for a set time under the current power. Compared with the prior art, the switch cabinet has the advantages that the temperature and humidity in the switch cabinet are detected in real time through the thermometer and the hygrometer, the power of the forced commutation assembly is adjusted in real time through the controller, different operation modes are formulated according to different environments and dehumidification requirements, the dehumidification efficiency is improved, and energy conservation is facilitated.

Description

Technical Field

[0001] The invention relates to condensation dehumidification of electrical equipment, and in particular to a dehumidification device and a dehumidification method applied inside a switch cabinet. Background Art

[0002] High-voltage switchgear plays an important role in the development of power grids. Its functions in ensuring the safety of power systems, improving power supply reliability, adapting to the needs of power grid expansion, promoting the development of smart grids, and supporting the access of new energy sources are particularly significant. As a key breaking and closing device in the power system, high-voltage switchgear can quickly cut off fault currents, protect power equipment and personal safety, prevent the spread of accidents, and ensure the safe and stable operation of the power grid. Dehumidification of switchgear is crucial in the power system. High humidity environment will have an adverse effect on the metal parts and insulating materials inside the switchgear, resulting in equipment corrosion and reduced insulation performance. Dehumidification of switchgear can prevent oxidation corrosion of metal contacts and connection parts, extend the service life of equipment, maintain the good performance of insulating materials, and reduce the occurrence of short circuit and breakdown accidents. Dehumidification can also reduce the frequency and cost of equipment maintenance, extend the service life of equipment, and has significant economic and social benefits.

[0003] After searching, the application publication number CN 114221236 A discloses a remote temperature and humidity control device for a switch cabinet, and the authorization announcement number CN 206516904U discloses a condensation dehumidification device for a semiconductor condensation component of a switch cabinet; the above-mentioned prior art provides a technical description of the dehumidification of the switch cabinet, and all use forced commutation to make water vapor flow through the condensation equipment for dehumidification, collect and discharge condensation to achieve the purpose of dehumidification inside the switch cabinet, and do not adjust according to the actual humidity conditions. Authorization announcement number CN206628720 U discloses a heating condensation dehumidification device for a high-voltage switch cabinet, but the prior art only sets a humidity threshold, and does not adopt a targeted dehumidification method for different environments, and the dehumidification efficiency is low.

[0004] In summary, how to design a dehumidification device and dehumidification method inside a switch cabinet that can adapt to different environments and improve dehumidification efficiency is a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a dehumidification device and a dehumidification method for use inside a switch cabinet in order to overcome the defects of the prior art that different dehumidification methods cannot be adopted according to different situations and the dehumidification efficiency is low.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a dehumidification device applied inside a switch cabinet is provided, which includes a forced commutation component, a condensation component, a diversion component, a thermometer, and a hygrometer installed inside the switch cabinet. It also includes a controller electrically connected to the thermometer, the hygrometer, and the forced commutation component. One end of the diversion component is connected to the condensation component, and the other end extends to the outside of the switch cabinet. The controller adjusts the power of the forced commutation component according to the current ambient temperature detected by the thermometer and the current ambient humidity detected by the hygrometer.

[0008] As a preferred technical solution, the forced commutation component is a fan.

[0009] According to another aspect of the present invention, a dehumidification method using the dehumidification device applied inside a switch cabinet is provided, which specifically includes the following steps:

[0010] Step S1, calculate the water output of condensed water under different temperatures and dehumidification requirements inside the switch cabinet to obtain a curve graph.

[0011] Step S2, obtain the current temperature and the current dehumidification requirement inside the switch cabinet. The processor compares the water output m0 in the curve graph corresponding to the current temperature and the current dehumidification requirement with the water output m after the working set time at the current power of the forced commutation component.

[0012] Step S3, if m0 > m, the controller controls the forced commutation component to increase the power and returns to Step S2; if m0 < m, the controller controls the forced commutation component to decrease the power and returns to Step S2.

[0013] As a preferred technical solution, the dehumidification requirement is the difference ΔRH between the initial absolute humidity and the target absolute humidity.

[0014] As a preferred technical solution, in Step S1, it specifically includes the following steps:

[0015] Step S101, measure the volume of the internal cavity of the switch cabinet.

[0016] Step S102, calculate the saturated vapor pressure at different temperatures.

[0017] Step S103, calculate the vapor pressure at different humidities according to the saturated vapor pressure.

[0018] Step S104, calculate the initial absolute humidity according to the vapor pressure and the corresponding temperature.

[0019] Step S105, calculate the water output of condensed water when reaching the target absolute humidity according to the difference ΔRH between the initial absolute humidity and the target absolute humidity and the volume of the internal cavity of the switch cabinet.

[0020] Step S106, obtaining a curve graph of the condensed water output when the target absolute humidity is reached according to different temperatures and different ΔRH.

[0021] As a preferred technical solution, the temperature range in step S102 is -10°C to 40°C.

[0022] As a preferred technical solution, the method for calculating the water vapor saturation pressure in step S102 is:

[0023]

[0024] Among them, p ws is the water vapor saturation pressure, T k is temperature, A, B, C, D are constant coefficients.

[0025] As a preferred technical solution, the difference ΔRH between the initial absolute humidity and the target absolute humidity in step S105 is in the range of 0.05 to 0.35.

[0026] As a preferred technical solution, in step S2, the method for obtaining the current temperature and current dehumidification demand in the switch cabinet is: a thermometer detects the current temperature, and a hygrometer detects the current humidity; the current absolute humidity is calculated based on the current humidity, and the value of the current absolute humidity is substituted into the initial absolute humidity; the target absolute humidity is input, and ΔRH is calculated.

[0027] As a preferred technical solution, in step S2, a fixed time interval is set and detection is performed at fixed intervals.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1) The present invention uses a thermometer and a hygrometer to detect the temperature and humidity inside the switch cabinet in real time, and the controller adjusts the power of the forced commutation component in real time, formulates different operation modes according to different environments and dehumidification requirements, improves the dehumidification efficiency, and helps save energy;

[0030] 2) The present invention adjusts the power of the forced commutation component through the water output curve of the condensed water under different temperatures and dehumidification requirements in the switch cabinet, which is more targeted to the actual environment and the power regulation is more accurate; the dehumidification time and detection time interval can be adjusted according to the needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a dehumidification device used inside a switch cabinet according to the present invention;

[0032] Figure 2 This is a flow chart of the dehumidification method of the present invention;

[0033] Figure 3It is a curve diagram of the condensed water output per unit time under different temperatures and dehumidification requirements in the switch cabinet of the present invention;

[0034] The numbers in the figure show:

[0035] 1. Switch cabinet, 2. Forced commutation assembly, 3. Condensation assembly, 4. Diversion assembly. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 1 As shown, the present invention provides a dehumidification device applied to the interior of a switch cabinet, comprising a forced commutation component 2, a condensation component 3, a flow guide component 4, a thermometer, a hygrometer and a controller.

[0039] The forced commutation component 2, the condensation component 3, the guide component 4, the thermometer, and the hygrometer are installed inside the switch cabinet 1. The thermometer, the hygrometer and the forced commutation component 2 are electrically connected to the controller. One end of the guide component 4 is connected to the condensation component 3, and the other end extends to the outside of the switch cabinet 1.

[0040] The forced commutation component 2 is used to accelerate the flow of gas inside the cavity. On the one hand, it accelerates the contact between the water vapor with uneven pressure in the flow cavity and the condensation device. On the other hand, it forces the heat generated by condensation to dissipate and accelerate the condensation process. A fan can be used; the condensation component 3 condenses the water vapor into liquid water and releases heat; the thermometer and hygrometer detect the current ambient temperature and humidity in the switch cabinet 1; the guide component 4 is used to guide the condensed water.

[0041] The dynamic adjustment mechanism of the output power of the forced commutation component 2 proposed based on the initial environmental state and the actual dehumidification demand can flexibly adjust the power output according to the actual working conditions, significantly improve the overall performance of the dehumidification device, and effectively save energy.

[0042] Example 2

[0043] like Figure 2 As shown, the present invention provides a dehumidification method applied to the interior of a switch cabinet 1 .

[0044] Step S1, calculating the water output of condensed water under different temperatures and dehumidification requirements in the switch cabinet 1, and obtaining a curve graph;

[0045] The calculation process is as follows:

[0046] 1) Determine the internal cavity volume of the switch cabinet 1. Taking the size of KYN28A high-voltage switch cabinet 1 as an example, the internal cavity size parameter is V 开关柜1 =0.8×1.5×2.2=2.64m 3 ;

[0047] 2) Calculate the water vapor saturation pressure at different temperatures. The calculation formula is as follows:

[0048]

[0049] Among them, p ws is the saturated pressure of water vapor (Pa), T k is the temperature (K), and A, B, C, and D are constant coefficients. Compared with existing calculation formulas (such as the Antony equation), this formula combines polynomial and exponential functions, making it better able to adapt to data changes in different temperature ranges. Polynomial terms (especially quadratic terms) can capture the nonlinear effects of temperature, while exponential terms help simulate the rapid changes in saturated vapor pressure as temperature increases;

[0050] 3) Calculate the water vapor pressure using the following formula:

[0051] p w =RH*p ws

[0052] Where RH is relative humidity;

[0053] 4) Calculate the absolute humidity using the following formula:

[0054]

[0055] Where A is the absolute humidity, M H2O is the molar mass of water, R is the universal gas constant;

[0056] 5) Calculate the condensed water output. The calculation formula is as follows:

[0057] m0=ΔRH*V 开关柜1 =(A1-A2)*V 开关柜1

[0058] Among them, m0 is the total water output of condensed water when the target absolute humidity is reached, A1 is the initial absolute humidity of the switch cabinet 1 before dehumidification, and A2 is the target absolute humidity of the switch cabinet 1 after dehumidification;

[0059] 6) According to the calculation results, draw a curve graph of the condensate water output under different temperatures and different dehumidification requirements. The temperature range in the curve graph is -10°C to 40°C, and the range of ΔRH is 0.05 to 0.35; define the dehumidification time, and calculate the water output per unit time m1 through the total water output m0 and the dehumidification time. Draw a curve graph of the condensate water output per unit time under different temperatures and different dehumidification requirements as shown in Figure 3 shown;

[0060] Step S2: The thermometer detects the current temperature, the hygrometer detects the current humidity, the processor obtains the current temperature and the current humidity, calculates the current absolute humidity according to the current humidity, substitutes the value of the current absolute humidity into the dehumidification absolute humidity, inputs the target absolute humidity, calculates ΔRH, substitutes the current temperature and ΔRH into the curve graph to obtain the corresponding total water output m0, and compares the total water output m0 with the water output m after the forced commutation component 2 operates for the set time at the current power; alternatively, the water output per unit time m1 can be compared with the water output per unit time m2 of the forced commutation component 2 at the current power.

[0061] Step S3: If m0 > m, the controller controls the forced commutation component 2 to increase the power; if m0 < m, the controller controls the forced commutation component 2 to decrease the power; or if m1 > m2, the controller controls the forced commutation component 2 to increase the power, if m1 < m2, the controller controls the forced commutation component 2 to decrease the power; after the power adjustment, return to Step S2 to perform detection and comparison again. A fixed time interval can be set to perform detection at fixed intervals; the time for the forced commutation component 2 to reach the dehumidification target can be set according to requirements, and the processor makes corresponding adjustments to the power it needs to reach.

[0062] Through experiments, it is known that the water output per unit time of the condensate water of the forced commutation device with a fan is 12.5 ml / h.

[0063] In the actual application of the existing dehumidification device in the high-voltage switch cabinet 1, the dehumidification requirements are often not dynamically determined according to the actual space and specific environment of the switch cabinet 1. Therefore, the present invention dynamically adjusts the output power of the commutation device according to the volume and initial environmental state of the on-site switch cabinet 1, combined with the actual dehumidification requirements including dehumidification efficiency and dehumidification degree, so as to achieve the purpose of reducing energy consumption and improving the overall dehumidification efficiency of the system.

[0064] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A dehumidification device used in a switch cabinet, characterized in that: It includes a forced commutation component (2), a condensation component (3), a diversion component (4), a thermometer and a hygrometer installed in a switchgear cabinet (1), and also includes a controller electrically connected to the thermometer, the hygrometer and the forced commutation component (2). One end of the diversion component (4) is connected to the condensation component (3), and the other end extends to the outside of the switchgear cabinet (1). The controller adjusts the power of the forced commutation component (2) according to the current ambient temperature detected by the thermometer and the current ambient humidity detected by the hygrometer.

2. A dehumidification device for use in a switch cabinet according to claim 1, characterized in that: The forced commutation component (2) is a fan.

3. A dehumidification method using the dehumidification device applied inside a switch cabinet according to claim 1, characterized in that: Specifically, it includes the following steps: Step S1, calculate the water output of condensed water under different temperatures and dehumidification requirements in the switchgear cabinet (1) to obtain a curve graph. Step S2, obtain the current temperature and the current dehumidification requirement in the switchgear cabinet (1). The processor compares the water output m0 in the curve graph corresponding to the current temperature and the current dehumidification requirement with the water output m after the set working time at the current power of the forced commutation component (2). Step S3, if m0 > m, the controller controls the forced commutation component (2) to increase the power and returns to Step S2; if m0 < m, the controller controls the forced commutation component (2) to decrease the power and returns to Step S2.

4. The dehumidification method according to claim 3, characterized in that: The dehumidification requirement is the difference ΔRH between the initial absolute humidity and the target absolute humidity.

5. The dehumidification method according to claim 4, characterized in that: In the said Step S1, it specifically includes the following steps: Step S101, measure the volume of the internal cavity of the switchgear cabinet (1). Step S102, calculate the saturated vapor pressure at different temperatures. Step S103, calculate the vapor pressure at different humidities according to the saturated vapor pressure. Step S104, calculate the initial absolute humidity according to the vapor pressure and the corresponding temperature. Step S105, calculate the water output of condensed water when reaching the target absolute humidity according to the difference ΔRH between the initial absolute humidity and the target absolute humidity and the volume of the internal cavity of the switchgear cabinet (1). Step S106, obtain a curve graph according to the water output of condensed water when reaching the target absolute humidity at different temperatures and different ΔRHs.

6. The dehumidification method according to claim 5, characterized in that: The temperature range in the said Step S102 is -10°C to 40°C.

7. The dehumidification method according to claim 5, characterized in that: The calculation method of the saturated vapor pressure in the said Step S102 is: Among them, p ws is the water vapor saturation pressure, T k is temperature, A, B, C, D are constant coefficients.

8. The dehumidification method according to claim 5, characterized in that: The range of the difference ΔRH between the initial absolute humidity and the target absolute humidity in the said Step S105 is 0.05 to 0.

35.

9. The dehumidification method according to claim 4, characterized in that: In the said Step S2, the method for obtaining the current temperature and the current dehumidification requirement in the switchgear cabinet (1) is: the thermometer detects the current temperature, and the hygrometer detects the current humidity; calculate the current absolute humidity according to the current humidity, substitute the value of the current absolute humidity into the initial absolute humidity; input the target absolute humidity and calculate to obtain ΔRH.

10. The dehumidification method according to claim 3, characterized in that: In the said Step S2, set a fixed time interval and perform detection every fixed time.

Images