A box-type transformer moisture-proof system and method for mountain wind farms

Abstract

This invention relates to the field of power equipment protection technology, specifically to a moisture-proof system and method for a box-type transformer used in mountainous wind farms. By setting up a support platform to elevate the transformer body and form a ventilation layer, moisture accumulated on the ground is effectively isolated. The ventilation and moisture-proof unit actively exchanges air when the external environment is better than the internal environment, reducing the operating time of active dehumidification. The oil-filled drying unit utilizes the oil-filled conduit's intake and exhalation processes to achieve air drying and desiccant regeneration, requiring no additional energy consumption or frequent maintenance. Simultaneously, combined with environmental sensors and a control unit, the system monitors internal and external temperature and humidity in real time and intelligently controls the opening and closing of the ventilation and moisture-proof unit, fundamentally preventing condensation and moisture intrusion, significantly improving the reliability of the transformer operation and reducing maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of power equipment protection technology, specifically to a moisture-proof system and method for box-type transformers used in mountainous wind farms. Background Technology

[0002] As a key piece of equipment used in wind farms to collect and step up electrical energy, the reliability of box-type transformers directly affects the power generation efficiency and grid security of the entire wind farm. In mountainous wind farms, box-type transformers are exposed to harsh natural environments with high humidity, frequent condensation, and significant diurnal temperature differences year-round. Due to the intrusion of ambient moisture and the generation of internal condensation, the box-type transformers are prone to faults such as decreased insulation levels, corrosion of metal components, and short circuits in secondary terminals, which seriously threaten the safe and stable operation of the power system and lead to high operation and maintenance costs.

[0003] Currently, common industry practices for moisture-proofing transformer substations include: enhancing the sealing of the enclosure structure, installing ordinary electric heaters or industrial dehumidifiers inside the enclosure, and filling the transformer oil conservator breather with silica gel desiccant. However, these existing technical solutions have revealed many shortcomings in practical applications: First, the measures are isolated and passive. Various moisture-proof measures are usually set up independently, lacking a systematic and coordinated working mechanism. Most measures (such as heating, starting the dehumidifier, and replacing the silica gel) only respond passively after dampness or condensation has already occurred, and cannot prevent the formation of a damp environment at its source.

[0004] Second, the moisture-proof effect is limited and the reliability is not high. For example, the sealing strips of the enclosure are prone to aging and cracking, leading to sealing failure; ordinary heaters may exacerbate the risk of local condensation due to uneven heating; industrial dehumidifiers have high energy consumption, and once they fail, they will lead to a protective vacuum; silicone breathers will quickly absorb moisture and become saturated in a continuous high-humidity environment, causing undried air to directly enter the transformer oil conservator.

[0005] Third, the workload of operation and maintenance is large. Due to the limitations of the above measures, operation and maintenance personnel need to frequently travel to remote mountainous wind farm sites to perform tasks such as replacing color-changing silica gel, checking the sealing condition of the enclosure, and repairing faulty dehumidification equipment, which results in high labor costs and untimely response.

[0006] Fourth, there are safety hazards. Traditional cable inlet sealing methods are easily damaged and difficult to restore when replacing or adding cables; some transformer substations have substandard emergency oil drainage facilities, posing a risk of environmental pollution. Summary of the Invention

[0007] The purpose of this invention is to provide a moisture-proof system and method for box-type transformers used in mountainous wind farms, thereby solving the technical problem of poor moisture-proof treatment effect of existing box-type transformers.

[0008] The solution of the present invention to the above-mentioned technical problems is as follows: A moisture-proof system for a box-type transformer used in a mountainous wind farm includes: The support platform is used to provide support for the main body of the transformer substation, creating a ventilation layer between the main body of the transformer substation and the ground. The ventilation and moisture-proof unit is installed on the main body of the transformer substation and is used to exchange air between the inside and outside of the transformer substation when the external environment of the transformer substation is better than the internal environment of the transformer substation. The oil pillow drying unit is used to dry the moisture-containing air during the inhalation of the oil pillow through the drying canister, and to dry the drying canister through the high temperature during the exhalation of the oil pillow. An active drying unit is installed inside the transformer substation body and is used for active mechanical drying of the interior of the transformer substation body; Environmental sensors are used to acquire the internal temperature and humidity environment of the transformer substation. The control unit is used to acquire the temperature and humidity environment inside and outside the transformer substation, and to control the opening or closing of the ventilation and moisture-proof unit and the active drying unit according to the temperature and humidity environment inside and outside the transformer substation.

[0009] Further defined, the support platform includes a support foundation, support columns, support steel beams, and support grid; The supporting columns are installed between the supporting foundation and the supporting steel beam, and the supporting grid covers the top of the supporting steel beam. The supporting grid is used to place the main body of the transformer substation.

[0010] Furthermore, the supporting grid is covered with a moisture-proof sealing gasket, and a protective barrier is provided around the supporting grid.

[0011] Further specified, an oil collection pool is provided below the supporting grid, and an emergency oil drain pipe is provided on the supporting grid. The bottom of the emergency oil drain pipe is connected to the oil collection pool, and the top of the emergency oil drain pipe is used to connect to the main body of the transformer substation through an emergency oil drain valve.

[0012] Further specifying, the ventilation and moisture-proof unit includes a sandwich ventilation wall panel installed on the side wall of the transformer substation main body, and the sandwich ventilation wall panel includes an inner sealing plate, an outer sealing plate, an electric louvered air valve, and a flow guide layer; The inner sealing plate is located on the inner side of the transformer substation body, and the outer sealing plate is located on the outer side of the transformer substation body. A ventilation interlayer is formed between the inner and outer sealing plates. The air guiding layer is located inside the ventilation interlayer. The bottom of the ventilation interlayer is the air inlet, and the top of the ventilation interlayer is the air outlet. The air inlet and / or air outlet are equipped with electric louvered air valves. The control unit is communicatively connected to the electric louvered air valves.

[0013] Further defined, the diversion layer includes a plurality of diversion sheets, and the plurality of diversion sheets are sequentially arranged in an S shape in the vertical direction and welded to the corresponding inner sealing plate and outer sealing plate. The active drying unit includes a dehumidifier disposed in the box-type transformer main body, and the box-type transformer main body is coated with a hydrophobic coating.

[0014] Further defined, the conservator drying unit includes a first drying tank, a second drying tank and a differential pressure switching valve connected to the transformer conservator. The first drying tank and the second drying tank are both connected to the transformer conservator through the differential pressure switching valve, and the first drying tank, the second drying tank and the differential pressure switching valve are all located in the box-type transformer main body.

[0015] A moisture-proof method for a box-type transformer in a mountain wind farm, based on the above-mentioned moisture-proof system for a box-type transformer in a mountain wind farm, includes the following steps: Obtain the dew point temperature Tdp of the air inside the box-type transformer main body in real time; Calculate the coldest point temperature Twall of the inner wall of the box-type transformer main body min ; [[ID=?]]Judge whether it satisfies Twall min - Tdp < ΔTsafe, if not, then be silent; if so, then judge to start ventilation moisture-proof or active moisture-proof according to the ventilation principle; ΔTsafe is a preset safety value.

[0016] Further defined, the ventilation moisture-proof is specifically: Close the active drying unit, open the ventilation moisture-proof unit, and the inside of the box-type transformer main body is connected to the external environment, so that the external dry and cold air enters the inside of the box-type transformer main body to discharge the humid air inside the box-type transformer main body. The active moisture-proof is specifically: Close the ventilation moisture-proof unit and start the active drying unit.

[0017] Further defined, the ventilation principle is specifically: Obtain the internal humidity W1 of the box-type transformer main body and the external humidity W2 of the box-type transformer main body; Obtain the internal temperature T1 of the box-type transformer main body and the external temperature T2 of the box-type transformer main body; Obtain the external weather of the box-type transformer main body; If all of the following are satisfied simultaneously: W1 - W2 > a, T2 < T1 and there is no rainfall outside the box-type transformer main body, where a is a preset humidity threshold.

[0018] The beneficial effects of the present invention are as follows: Note: There seems to be a formatting issue in line 16 where "判断是否满足Twall" might be missing an operator like ">" or "<" in the original Chinese. The translation has been done as accurately as possible based on the provided text.1. This invention elevates the transformer substation body by setting up a support platform to form a ventilation layer, effectively isolating moisture accumulated on the ground. It utilizes a ventilation and moisture-proof unit to actively exchange air when the external environment is better than the internal environment, reducing the operating time of active dehumidification. An oil-filled drying unit uses the oil-filled conduit's inhalation and exhalation processes to achieve air drying and desiccant regeneration, requiring no additional energy consumption or frequent maintenance. Simultaneously, combined with environmental sensors and a control unit, it monitors internal and external temperature and humidity in real time and intelligently controls the opening and closing of the ventilation and moisture-proof unit, fundamentally preventing condensation and moisture intrusion, significantly improving the reliability of the transformer substation operation and reducing maintenance costs.

[0019] 2. This invention covers the supporting grid with a moisture-proof sealing gasket to improve the stability of the transformer substation body; by setting a ventilation and moisture-proof unit on the transformer substation body that communicates with its interior and exterior, and cooperating with the opening and closing of the electric louvered air valve, the air exchange between the interior and exterior of the transformer substation body is realized, ensuring that the air inside the transformer substation body is dry and cold, reducing the start-up and shutdown of the internal dehumidification device and the workload, increasing its service life and reducing maintenance requirements; at the same time, the oil conservator drying unit uses two drying tanks, one of which draws in air to reduce the humidity of the internal air, and the other dries the desiccant in the drying tank when it exhausts air, realizing the recycling of the desiccant in the drying tank and reducing the workload of maintenance; an oil collection pool is set up to meet the needs of emergency oil drainage. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the moisture-proof system for a box-type transformer used in a mountainous wind farm according to the present invention; Figure 2 This is a schematic diagram of the supporting platform structure of the present invention; Figure 3 This is a schematic diagram of the ventilation and moisture-proof unit structure of the present invention; Figure 4 This is a schematic diagram of the oil pillow drying unit structure of the present invention; Figure 5 This is a diagram illustrating the steps of moisture protection for a box-type transformer used in a mountainous wind farm according to the present invention.

[0021] In the diagram, 10-supporting foundation; 11-supporting column; 12-supporting steel beam; 13-supporting grid; 14-moisture-proof sealing gasket; 15-protective enclosure; 16-oil collection tank; 17-emergency oil drain pipe; 20-inner sealing plate; 21-outer sealing plate; 22-electric louvered damper; 23-guide vane; 24-ventilation interlayer; 30-differential pressure switching valve; 31-first drying tank; 32-second drying tank; 40-control unit; 50-substation main body; 51-transformer oil conservator; 52-dehumidifier; 60-modular fireproof and moisture-proof sealing unit. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Example 1 refer to Figure 1 This invention provides a moisture-proof system for a box-type transformer used in mountainous wind farms, comprising: The support platform is used to provide support for the transformer substation body 50 and to create a ventilation layer between the transformer substation body 50 and the ground. The ventilation and moisture-proof unit is installed on the transformer substation body 50 and is used to exchange air between the inside and outside of the transformer substation body 50 when the external environment of the transformer substation body 50 is better than the internal environment of the transformer substation body 50. The oil pillow drying unit is used to dry the moisture-containing air during the inhalation of the oil pillow through the drying canister, and to dry the drying canister through the high temperature during the exhalation of the oil pillow. An active drying unit is installed inside the transformer substation body 50 and is used for active mechanical drying of the interior of the transformer substation body 50. An environmental sensor is used to acquire the internal temperature and humidity environment of the transformer substation body 50. The control unit 40 is used to acquire the temperature and humidity environment inside and outside the transformer substation body 50, and to control the ventilation and moisture-proof unit to open or close according to the temperature and humidity environment inside and outside the transformer substation body 50.

[0027] For further explanation, please refer to Figure 2 The support platform includes a support foundation 10, support columns 11, support steel beams 12, and support grid 13. The support foundation 10 can be made of reinforced concrete, and there are, for example, eight of them, to increase the stability and reliability of the support. The support columns 11 are set between the support foundation 10 and the support steel beams 12. The support columns 11 can be hot-dip galvanized H-beams. The support grid 13 covers the support steel beams 12 and is used to place the transformer substation body 50. The support grid 13 is made of steel grid with a load-bearing capacity of not less than 4 tons / square meter, so that the transformer substation body 50 is 600mm~1000mm off the ground. At this time, natural airflow and ventilation can be carried out under the transformer substation body 50.

[0028] To handle emergency oil drainage, a supporting grid 13 and an oil collection tank 16 will be constructed on the ground using concrete. The volume of the oil collection tank 16 can be 1.8m³. 3 An emergency drain pipe 17 is provided on the support grid 13. The material can be stainless steel. The bottom of the emergency drain pipe 17 is connected to the oil collection tank 16. The top of the emergency drain pipe 17 is used to connect to the transformer body 50 through the emergency drain valve, so as to open the emergency drain valve to drain oil in case of an emergency.

[0029] To improve safety, a protective barrier 15 is provided around the support grid 13. The bottom of the protective barrier 15 extends below the ground. The aperture of the protective barrier 15 can be 5mm×5mm, and the material can be stainless steel. Preferably, to ensure that the transformer substation body 50 is placed stably on the support grid 13 without shaking, a moisture-proof sealing gasket 14 is covered on the support grid 13 to eliminate rigid contact gaps. The moisture-proof sealing gasket 14 can be made of EPDM rubber composite material with a compression set of less than or equal to 15% and a tear strength of greater than or equal to 25kN / m.

[0030] To further explain, after the main body 50 of the transformer substation is hoisted, the cables of the main body 50 are sealed using a modular fireproof and moisture-proof sealing unit 60. Cable holes can be made in the moisture-proof sealing gasket 14, and the cables pass through the cable holes and then through the support grid 13 and the support steel beam 12. The modular fireproof and moisture-proof sealing unit 60 is set on the support grid 13 and the support steel beam 12. The modular fireproof and moisture-proof sealing unit 60 is composed of prefabricated flame-retardant EPDM elastic modules and matching fireproof sealant. The sealing is completed by on-site assembly, ensuring that it has the characteristics of being disassembled and reused without damage.

[0031] For further explanation, please refer to Figure 3 The ventilation and moisture-proof unit includes a sandwich ventilation wall panel installed on the side wall of the transformer substation body 50. The sandwich ventilation wall panel includes an inner sealing plate 20, an outer sealing plate 21, an electric louvered air valve 22, and a flow guide layer. The ventilation and moisture-proof unit is installed after the original sealing side wall of the transformer substation body 50 is removed.

[0032] Specifically, the inner sealing plate 20 is located on the inner side of the transformer substation body 50, and the outer sealing plate 21 is located on the outer side of the transformer substation body 50. Both the inner sealing plate 20 and the outer sealing plate 21 are connected to the transformer substation body 50. A ventilation interlayer 24 is formed between the inner sealing plate 20 and the outer sealing plate 21. The thickness of the ventilation interlayer 24 is 50mm to 120mm. Taking 80mm as an example, the outer sealing plate 21 can be made of aluminum-zinc coated steel plate.

[0033] The airflow guide layer is set inside the ventilation interlayer 24. The bottom of the ventilation interlayer 24 is the air inlet, and it is equipped with an insect screen and G4 grade primary filter cotton. The top of the ventilation interlayer 24 is the air outlet. The air inlet and / or air outlet are equipped with electric louvered dampers 22. The control unit 40 and the electric louvered dampers 22 are both equipped with electric louvered dampers 22. The control unit 40 is communicatively connected to the electric louvered dampers 22 and is used to open or close the ventilation interlayer 24 as needed.

[0034] The flow guide layer includes multiple flow guide plates 23, which are arranged sequentially in an S-shape in the vertical direction. The angle between the flow guide plate 23 and the inner sealing plate 20 or the outer sealing plate 21 is 30° to 60°, and the maximum distance between adjacent flow guide plates 23 is 20mm to 40mm.

[0035] To further explain, in order to ensure the dryness of the interior of the transformer substation 50 when the external environment is poor and ventilation is not possible, the active drying unit includes a dehumidifier 52. The dehumidifier 52 is communicatively connected to the control unit 40, and the dehumidifier 52 can be selected with a rated dehumidification capacity of 5L / day. Preferably, a hydrophobic coating is applied to the inner wall of the transformer substation 50, the insulators, and the secondary terminal blocks. The water contact angle of the hydrophobic coating is greater than 150° and the roll-off angle is less than 10°, which can effectively prevent the formation of a water film.

[0036] For further explanation, please refer to Figure 4The oil conservator drying unit includes a first drying tank 31, a second drying tank 32, and a differential pressure switching valve 30. Both the first drying tank 31 and the second drying tank 32 are connected to the transformer oil conservator 51 through the differential pressure switching valve 30. The silicone breather connected to the transformer oil conservator 51 is eliminated. The first drying tank 31, the second drying tank 32, and the differential pressure switching valve 30 are all located inside the transformer substation body 50. Both the first drying tank 31 and the second drying tank 32 are filled with 4A type zeolite molecular sieve. The differential pressure switching valve 30 is a purely mechanical automatic switching valve driven by the differential pressure of the breathing airflow of the transformer oil conservator 51.

[0037] During operation, when the transformer oil conservator 51 draws in air due to a decrease in oil temperature and level, the humid air in the transformer substation main body 50 first enters the first drying tank 31 through the differential pressure switching valve 30, undergoes deep drying, and then enters the transformer oil conservator 51. When the transformer oil conservator 51 exhales air due to an increase in oil temperature and level, the warm, dry air discharged from the transformer oil conservator 51, guided by the differential pressure switching valve 30, blows in the opposite direction to the second drying tank 32. Utilizing the heat and dryness of this airflow, the moisture adsorbed by the molecular sieve in the second drying tank 32 is desorbed and discharged, thereby regenerating the second drying tank 32. When the first drying tank 31 becomes saturated or the second drying tank 32 is regenerated, the differential pressure switching valve 30 automatically reverses under the action of the airflow differential pressure, causing the two tanks to switch roles. This cycle repeats continuously, achieving all-weather, zero-energy-consumption, and maintenance-free drying protection for the oil conservator.

[0038] To further explain, the environmental sensors include temperature and humidity sensors, which can be installed in the high and low pressure chambers and ventilation interlayer 24 within the transformer substation body 50. The control unit 40 can communicate wirelessly with the temperature and humidity sensors, the electric louvered damper 22, and the dehumidifier 52. The control unit 40 can obtain the temperature and humidity data inside the transformer substation body 50 based on the temperature and humidity sensors, where the internal humidity of the transformer substation body 50 is W1 and the external humidity of the transformer substation body 50 is W2, and the internal temperature of the transformer substation body 50 is T1 and the external temperature of the transformer substation body 50 is T2. The control unit 40 stores the material and historical data of the transformer substation body 50, can obtain meteorological data of the external environment, and has a preset control algorithm based on condensation prediction, thereby controlling the opening or closing of the ventilation and dehumidification unit and the active drying unit according to the internal and external temperature and humidity environment of the transformer substation body 50.

[0039] In use, the control unit 40 can collect data at preset intervals, such as 5 minutes. The control unit 40 acquires meteorological data from the temperature and humidity sensor and the external environment, calculates the dew point temperature Tdp of the air inside the transformer substation body 50 in real time, and calculates the coldest point temperature Twall of the inner wall of the transformer substation body 50 based on the material of the transformer substation body 50 and historical data. min .

[0040] When detected (Twall)min When ΔT = Twall - Tdp < ΔTsafe, it is determined that there is a risk of condensation. At this time, dehumidification operation needs to be carried out inside the main body 50 of the box-type substation. ΔTsafe is a preset safety value. Optionally, ΔTsafe is selected as 3°C.

[0041] Preferably, before the control unit 40 turns on or off the air exchange and moisture-proof unit and the active drying unit, it is necessary to judge the humidity and temperature inside and outside the main body 50 of the box-type substation and whether it is raining outside. If W1 - W2 > a, T2 < T1 and there is no rainfall outside the main body 50 of the box-type substation are satisfied at the same time, the electric louver damper 22 is opened for natural ventilation and dehumidification; otherwise, the entry of external air will exacerbate the risk of condensation. At this time, the electric louver damper 22 is kept closed, and only the dehumidifier 52 is turned on to circulate and dehumidify the internal air.

[0042] Furthermore, to cope with abnormal situations, for example, when the internal temperature of the main body 50 of the box-type substation increases abnormally, the electric louver damper 22 is directly opened for active heat dissipation at this time, and the humidity situation of the external environment can be ignored to ensure the current safe use of the equipment.

[0043] Embodiment 2 Based on Embodiment 1, this embodiment provides a moisture-proof method for a box-type transformer used in a mountain wind farm, including the following steps: [[ID=十四]]Obtain the dew point temperature Tdp of the air inside the main body 50 of the box-type substation in real time; Calculate the temperature Twall of the coldest point on the inner wall of the main body 50 of the box-type substation min ; Judge whether Twall min - Tdp < ΔTsafe is satisfied. If not, remain silent; if so, judge whether to turn on air exchange and moisture-proof or active moisture-proof according to the ventilation principle; ΔTsafe is a preset safety value.

[0044] Furthermore, the air exchange and moisture-proof is specifically as follows: Turn off the active drying unit, turn on the air exchange and moisture-proof unit, and the inside of the main body 50 of the box-type substation is connected to the external environment, so that the external dry and cold air enters the inside of the main body 50 of the box-type substation to discharge the humid air inside the main body 50 of the box-type substation; The active moisture-proof is specifically as follows: Turn off the air exchange and moisture-proof unit and start the active drying unit.

[0045] Furthermore, the ventilation principle is specifically as follows: Obtain the internal humidity W1 of the main body 50 of the box-type substation and the external humidity W2 of the main body 50 of the box-type substation; Obtain the internal temperature T1 of the main body 50 of the box-type substation and the external temperature T2 of the main body 50 of the box-type substation; Obtain the external weather of the main body 50 of the box-type substation; If the following conditions are simultaneously met: W1 - W2 > a, T2 < T1 and there is no rainfall outside the main body 50 of the transformer substation, where a is a preset humidity threshold, for example, 15%RH.

[0046] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0047] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

[0048] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A moisture-proof system for a box-type transformer used in a mountainous wind farm, characterized in that, include: A support platform is used to provide support for the main body (50) of the transformer substation so that a ventilation layer is formed between the main body (50) of the transformer substation and the ground; The ventilation and moisture-proof unit is installed on the transformer substation body (50) and is used to exchange air between the inside and outside of the transformer substation body (50) when the external environment of the transformer substation body (50) is better than the internal environment of the transformer substation body (50). The oil pillow drying unit is used to dry the moisture-containing air during the inhalation of the oil pillow through the drying canister, and to dry the drying canister through the high temperature during the exhalation of the oil pillow. An active drying unit is installed inside the transformer substation body (50) and is used for active mechanical drying of the inside of the transformer substation body (50); An environmental sensor is used to acquire the internal temperature and humidity environment of the transformer substation body (50); The control unit (40) is used to obtain the temperature and humidity environment inside and outside the transformer body (50), and to control the opening or closing of the ventilation and moisture-proof unit and the active drying unit according to the temperature and humidity environment inside and outside the transformer body (50).

2. The moisture-proof system for box-type transformers used in mountainous wind farms according to claim 1, characterized in that, The support platform includes a support foundation (10), support columns (11), support steel beams (12), and support grid (13). The supporting column (11) is set between the supporting foundation (10) and the supporting steel beam (12), and the supporting grid (13) covers the supporting steel beam (12). The supporting grid (13) is used to place the transformer substation body (50).

3. The moisture-proof system for box-type transformers used in mountainous wind farms according to claim 2, characterized in that, The support grid (13) is covered with a moisture-proof sealing gasket (14), and a protective barrier (15) is provided around the support grid (13).

4. The moisture-proof system for box-type transformers used in mountainous wind farms according to claim 2, characterized in that, An oil collection tank (16) is provided below the support grid (13), and an emergency oil drain pipe (17) is provided on the support grid (13). The bottom of the emergency oil drain pipe (17) is connected to the oil collection tank (16), and the top of the emergency oil drain pipe (17) is used to connect to the transformer substation body (50) through the emergency oil drain valve.

5. The moisture-proof system for box-type transformers used in mountainous wind farms according to claim 1, characterized in that, The ventilation and moisture-proof unit includes a sandwich ventilation wall panel installed on the side wall of the transformer body (50). The sandwich ventilation wall panel includes an inner sealing plate (20), an outer sealing plate (21), an electric louvered air valve (22), and a flow guide layer. The inner sealing plate (20) is located on the inner side of the transformer substation body (50), and the outer sealing plate (21) is located on the outer side of the transformer substation body (50). A ventilation interlayer (24) is formed between the inner sealing plate (20) and the outer sealing plate (21). The flow guiding layer is located inside the ventilation interlayer (24). The bottom of the ventilation interlayer (24) is the air inlet, and the top of the ventilation interlayer (24) is the air outlet. The air inlet and / or the air outlet are equipped with an electric louvered air valve (22). The control unit (40) is communicatively connected to the electric louvered air valve (22).

6. The moisture-proof system for box-type transformers used in mountainous wind farms according to claim 5, characterized in that, The flow guiding layer includes multiple flow guiding plates (23), which are arranged sequentially in an S-shape in the vertical direction and welded to the corresponding inner sealing plate (20) and outer sealing plate (21); The active drying unit includes a dehumidifier (52) installed inside the transformer substation body (50), and the transformer substation body (50) is coated with a hydrophobic coating.

7. The moisture-proof system for box-type transformers used in mountainous wind farms according to claim 1, characterized in that, The oil conservator drying unit includes a first drying tank (31), a second drying tank (32) and a differential pressure switching valve (30) connected to the transformer oil conservator (51). The first drying tank (31) and the second drying tank (32) are both connected to the transformer oil conservator (51) through the differential pressure switching valve (30). The first drying tank (31), the second drying tank (32) and the differential pressure switching valve (30) are all located inside the box-type transformer main body (50).

8. A method for moisture protection of a box-type transformer used in a mountainous wind farm, characterized in that, The box-type transformer moisture-proof system for mountain wind farms according to any one of claims 1 to 7 includes the following steps: Obtain the dew point temperature Tdp of the air inside the box-type transformer main body (50) in real time; Calculate the coldest point temperature Twall of the inner wall of the transformer substation (50). min ; Determine if Twall is satisfied min - If Tdp < ΔTsafe, then remain silent; if so, then determine whether to activate ventilation and moisture protection or active moisture protection based on ventilation principles; ΔTsafe is the preset safety value.

9. The moisture-proofing method for box-type transformers used in mountainous wind farms according to claim 8, characterized in that, The ventilation moisture-proof is specifically as follows: Close the active drying unit, open the ventilation moisture-proof unit, and connect the inside of the box-type transformer main body (50) to the external environment, so that the external dry and cold air enters the inside of the box-type transformer main body (50) to discharge the humid air inside the box-type transformer main body (50). The active moisture-proof is specifically as follows: Close the ventilation moisture-proof unit and start the active drying unit.

10. The moisture-proofing method for box-type transformers used in mountainous wind farms according to claim 8, characterized in that, The ventilation principle is specifically as follows: Obtain the internal humidity W1 of the box-type transformer main body (50) and the external humidity W2 of the box-type transformer main body (50); Obtain the internal temperature T1 of the box-type transformer main body (50) and the external temperature T2 of the box-type transformer main body (50); Obtain the external weather of the box-type transformer main body (50); If all of the following conditions are met simultaneously: W1 - W2 > a, T2 < T1 and there is no rainfall outside the box-type transformer main body (50), where a is a preset humidity threshold.

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