Temperature-resistant 35kV dry-type transformer for energy storage

Abstract

The temperature-resistant energy storage 35kV dry-type transformer comprises a transformer mechanism, an air inlet mechanism is installed at the bottom of the transformer mechanism, an air outlet mechanism is installed at the top of the transformer mechanism, a plurality of heat conduction mechanisms are arranged on the opposite sides of the air inlet mechanism and the air outlet mechanism, and the heat conduction mechanisms are installed in the transformer mechanism. The technical problems that in the using process of an existing dry-type transformer, the heat dissipation area of an air duct is inconvenient to automatically adjust according to the working state of a coil winding, aging of an insulating material is accelerated when the load is high and the temperature is high, and the risk of condensation is increased when the load is low and the temperature is low are solved. And the winding is corroded by over-high humidity.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, in particular to a temperature-resistant 35kV dry-type transformer for energy storage. Background Art

[0002] A dry-type transformer is a transformer that does not use liquid as a cooling or insulating medium, relying primarily on air or other gases for heat dissipation. The 35kV dry-type transformer for heat-resistant energy storage is a medium- and high-voltage power equipment designed specifically for energy storage systems. It features high-temperature tolerance, high reliability, and environmentally friendly features. With a voltage rating of 35kV, it is suitable for grid access or large-capacity energy storage systems. Its dry-type structure uses air or epoxy resin as an insulating medium, eliminating the need for transformer oil, eliminating fire risks and complying with environmental requirements. The insulation material is high-temperature resistant to ensure long-term stable operation in high-temperature environments. This dry-type transformer can be used for grid-side energy storage, new energy distribution storage, industrial and commercial energy storage, and areas with high ambient temperatures. Dry-type transformers have a cooling channel between the low-voltage and high-voltage windings, cooled by natural air convection or forced air cooling. Forced air cooling uses a fan to accelerate heat dissipation.

[0003] Chinese Patent Application No. 201920719999.3 discloses an air-cooled dry-type transformer comprising an air duct, a secondary coil disposed within the air duct, the secondary coil comprising a plurality of coils, and a PT100 temperature sensor comprising an insulating tube and a PT100 platinum thermal resistor disposed within the insulating tube. The PT100 temperature sensor is configured such that the bottom of the insulating tube abuts against one of the plurality of coils, and the PT100 platinum thermal resistor is positioned above the top of the secondary coil. This air-cooled dry-type transformer detects the temperature of the coil windings and can then perform forced air cooling based on the detected temperature.

[0004] During use, existing dry-type transformers are not convenient for automatically adjusting the heat dissipation area of the air duct according to the working status of the coil winding. When the load is high, the high temperature will cause the insulation material to age faster. When the load is low, the low temperature will increase the risk of condensation, resulting in excessive humidity and corrosion of the winding. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that during use, the existing dry-type transformer is not convenient for automatically adjusting the heat dissipation area of the air duct according to the working status of the coil winding. When the load is high, the high temperature will cause the insulation material to age faster. When the load is low, the low temperature will increase the risk of condensation, resulting in excessive humidity and corrosion of the winding.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A temperature-resistant 35kV dry-type transformer for energy storage, comprising a transformer mechanism, an air inlet mechanism installed at the bottom of the transformer mechanism, an air outlet mechanism installed at the top of the transformer mechanism, and a plurality of heat conducting mechanisms provided on the side opposite to the air inlet mechanism and the air outlet mechanism, and the plurality of heat conducting mechanisms are installed in the transformer mechanism.

[0007] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, the transformer mechanism includes a dry-type transformer body, on which a plurality of low-voltage windings and high-voltage windings are installed, and the low-voltage windings are located inside the high-voltage windings.

[0008] As a preferred embodiment of the temperature-resistant 35kV dry-type transformer for energy storage according to the present invention, air ducts are provided on the surface of the low-voltage winding and the inner wall of the high-voltage winding, the air inlet mechanism is installed at the bottom of the air duct inner cavity, the air outlet mechanism is installed at the top of the air duct inner cavity, and the heat conduction mechanism is installed in the air duct inner cavity and is located on the side opposite to the air inlet mechanism and the air outlet mechanism.

[0009] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, the air inlet mechanism includes a first annular sealing plate, which is fixedly connected to the bottom of the air duct inner cavity, and an air inlet head is installed around the inside of the first annular sealing plate, and the bottom of the air inlet head is connected to an annular pipe.

[0010] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, the air inlet end of the annular tube is connected to a bend pipe, the air inlet end of the bend pipe is connected to a solenoid valve, the air inlet end of the solenoid valve is connected to a fan, and the air inlet end of the fan is connected to an air filter.

[0011] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, the air inlet end of the air filter is connected to an air inlet hopper, the air outlet end of the air filter is connected to a connecting pipe, and the connecting pipe is connected to the air inlet end of the fan.

[0012] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, an air filter element and a filter screen are installed in the inner cavity of the air filter, and an inspection cover is installed on the top of the air filter.

[0013] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, the air outlet mechanism includes a second annular sealing plate, which is fixedly connected to the top of the air duct inner cavity, and the second annular sealing plate is surrounded by threaded holes, and the threaded holes are threadedly connected to an air outlet head.

[0014] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, the air outlet includes a threaded seat, the threaded seat is threadedly connected to the threaded hole, and a support ring is fixedly connected to the top of the threaded seat.

[0015] As a preferred solution of the temperature-resistant 35kV dry-type transformer for energy storage described in the present invention, the top of the support ring is rotatably connected to a closing cover, the bottom of the closing cover is fixedly connected to a reset spring, the bottom of the reset spring is fixedly connected to the inner wall of the threaded seat, and the reset spring is arranged at an angle.

[0016] Beneficial effects of the present invention: 1. The present invention forms a directional cooling airflow through the air inlet mechanism and the air outlet mechanism. The cold air flows evenly through the surface of the low-voltage winding and the high-voltage winding, directly taking away the heat. The thermal conductive phase change material in the thermal conductive fin melts and absorbs heat when the temperature is greater than 50°C, delaying the temperature rise. It solidifies and releases heat after the temperature drops, maintaining the continuity of heat dissipation. In addition, the thermal conductive phase change material converts from solid to liquid, which can facilitate the rotation of the aluminum alloy fins. When the temperature is greater than 70°C, the memory alloy spring contracts due to heat, and the aluminum alloy fins are linked to expand through the elastic hollow tube, thereby expanding the heat dissipation area and further enhancing the heat dissipation capacity. According to the feedback from the temperature sensor, the controller dynamically adjusts the fan speed and the solenoid valve opening to stabilize the winding temperature within the set range to avoid overheating or condensation.

[0017] 2. The present invention extends the service life by reducing the thermal aging rate of the insulation material through precise temperature control. The air outlet mechanism is automatically sealed by the return spring and the closing cover when there is no wind to prevent the air duct from being contaminated. The air filter adopts double filtration to prevent dust from clogging the air duct or corroding the winding. The thermal conductive fins adopt a fish gill-shaped structure to reduce wind resistance and reduce fan energy consumption. The hollow cavity design in the aluminum alloy fins reduces weight and reduces mechanical vibration and noise. The fins are expanded at high load to maximize the heat dissipation area, and are retracted at low load to reduce wind resistance, thereby achieving a balance between heat dissipation efficiency and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 Schematic diagram of the transformer mechanism of the present invention Figure 1 ; Figure 4 Schematic diagram of the transformer mechanism of the present invention Figure 2 ; Figure 5 Schematic diagram of the air inlet mechanism of the present invention; Figure 6 An exploded view of the air filter of the present invention; Figure 7 Exploded view of the air outlet mechanism of the present invention Figure 8 A schematic diagram of a wind outlet of the present invention; Figure 9 It is a partial cross-sectional schematic diagram of the present invention; Figure 10 Schematic diagram of the heat conduction mechanism of the present invention; Figure 11 It is a cross-sectional view of the heat conducting fin of the present invention.

[0019] Figure: 100, transformer mechanism; 101, dry-type transformer body; 102, low-voltage winding; 103, high-voltage winding; 104, air duct; 200, air inlet mechanism; 201, first annular blocking plate; 202, air inlet head; 203, annular pipe; 204, elbow; 205, air filter; 206, fan; 207, solenoid valve; 208, air filter element; 209, filter screen; 210, connecting pipe; 211, inspection cover; 212, air inlet hopper; 300, air outlet mechanism; 301, second annular sealing plate; shaped sealing plate; 302, threaded hole; 303, air outlet; 304, threaded seat; 305, support ring; 306, closing cover; 307, reset spring; 400, heat conduction mechanism; 401, heat conduction ring; 402, heat conduction fins; 403, fixing ring; 404, aluminum alloy fins; 405, hollow cavity; 406, heat-conducting phase change material; 407, flexible silicone member; 408, first rotating member; 409, elastic hollow tube; 410, fixing member; 411, second rotating member; 412, memory alloy spring. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] like Figures 1-11 As shown, this embodiment provides a temperature-resistant 35kV dry-type transformer for energy storage, including a transformer mechanism 100, an air inlet mechanism 200 is installed at the bottom of the transformer mechanism 100, an air outlet mechanism 300 is installed at the top of the transformer mechanism 100, and a plurality of heat conducting mechanisms 400 are provided on the side opposite to the air inlet mechanism 200 and the air outlet mechanism 300, and the plurality of heat conducting mechanisms 400 are installed in the transformer mechanism 100.

[0022] Furthermore, the transformer mechanism 100 includes a dry-type transformer body 101 , on which a plurality of low-voltage windings 102 and a high-voltage winding 103 are mounted, and the low-voltage winding 102 is located inside the high-voltage winding 103 .

[0023] Furthermore, an air duct 104 is provided on the surface of the low-voltage winding 102 and the inner wall of the high-voltage winding 103, the air inlet mechanism 200 is installed at the bottom of the inner cavity of the air duct 104, the air outlet mechanism 300 is installed at the top of the inner cavity of the air duct 104, and the heat conduction mechanism 400 is installed in the inner cavity of the air duct 104 and is located on the opposite side of the air inlet mechanism 200 and the air outlet mechanism 300.

[0024] Furthermore, the air inlet mechanism 200 includes a first annular sealing plate 201, which is fixedly connected to the bottom of the inner cavity of the air duct 104. An air inlet head 202 is installed around the inside of the first annular sealing plate 201, and the bottom of the air inlet head 202 is connected to an annular pipe 203.

[0025] Furthermore, the air inlet end of the annular tube 203 is connected to the elbow 204 , the air inlet end of the elbow 204 is connected to the solenoid valve 207 , the air inlet end of the solenoid valve 207 is connected to the fan 206 , and the air inlet end of the fan 206 is connected to the air filter 205 .

[0026] Furthermore, the air inlet end of the air filter 205 is connected to the air inlet hopper 212 , the air outlet end of the air filter 205 is connected to the connecting pipe 210 , and the connecting pipe 210 is connected to the air inlet end of the fan 206 .

[0027] Furthermore, an air filter element 208 and a filter screen 209 are installed in the inner cavity of the air filter 205, and an inspection cover 211 is installed on the top of the air filter 205.

[0028] Furthermore, the air outlet mechanism 300 includes a second annular sealing plate 301, which is fixedly connected to the top of the inner cavity of the air duct 104. A threaded hole 302 is opened around the second annular sealing plate 301, and an air outlet head 303 is threadedly connected inside the threaded hole 302.

[0029] Furthermore, the air outlet 303 includes a threaded seat 304 , which is threadedly connected to the threaded hole 302 , and a support ring 305 is fixedly connected to the top of the threaded seat 304 .

[0030] Furthermore, the top of the support ring 305 is rotatably connected to a closing cover 306 , the bottom of the closing cover 306 is fixedly connected to a return spring 307 , the bottom of the return spring 307 is fixedly connected to the inner wall of the threaded seat 304 , and the return spring 307 is tilted.

[0031] Furthermore, the heat conducting mechanism 400 includes a heat conducting ring 401 and a fixed ring 403. The heat conducting ring 401 is a graphene-based flexible composite material. The heat conducting ring 401 and the fixed ring 403 are fixedly mounted on the surface of the low-voltage winding 102. Heat conducting fins 402 are installed around the surface of the heat conducting ring 401 and the fixed ring 403.

[0032] Furthermore, the thermal conductive fin 402 includes an aluminum alloy fin 404, and a hollow cavity 405 is opened in the inner cavity of the aluminum alloy fin 404. A flexible silicone part 407 is fixedly connected to one end of the aluminum alloy fin 404. The inner cavity of the flexible silicone part 407 is filled with a thermal conductive phase change material 406. The thermal conductive phase change material 406 is a paraffin-based material. The thermal conductive phase change material 406 and the flexible silicone part 407 are arranged to be tilted downward, and the flexible silicone part 407 is fixedly connected to the surface of the thermal conductive ring 401.

[0033] Furthermore, a first rotating member 408 is fixedly connected to the bottom of the fixing ring 403, a second rotating member 411 is provided at the bottom of the first rotating member 408, a fixing member 410 is rotatably connected to the first rotating member 408 and the second rotating member 411, and an elastic hollow tube 409 and a memory alloy spring 412 are fixedly connected to one opposite end of the fixing member 410, the memory alloy spring 412 is located in the inner cavity of the elastic hollow tube 409, a corrugated structure is provided on the surface of the elastic hollow tube 409, and the memory alloy spring 412 is a nickel-titanium-based Ni-Ti shape memory alloy.

[0034] Furthermore, temperature sensors are installed on the low-voltage winding 102 and the high-voltage winding 103. The output end of the temperature sensor is electrically connected to a controller. The controller receives the detection signal of the temperature sensor and controls the operation of the air intake mechanism 200 according to the preset temperature and the detected temperature.

[0035] Furthermore, the air intake mechanism 200 draws in external air according to the control data of the controller, and controls the air output according to the data range of the detected temperature, so that the operating temperature of the transformer mechanism 100 is maintained at a set value.

[0036] Furthermore, the air outlet mechanism 300 controls the exhaust of the air duct 104. When air is injected into the air duct 104, the air outlet mechanism 300 opens to discharge the air to the outside. When the injection of air stops, the air outlet mechanism 300 closes to prevent external dust from entering the air duct 104.

[0037] Furthermore, several heat-conducting mechanisms 400 are evenly arranged inside the air duct 104 to absorb the heat on the surface of the low-voltage winding 102 and conduct the absorbed heat to the cold air inside the air duct 104, thereby achieving efficient heat dissipation of the low-voltage winding 102. The heat-conducting mechanism 400 increases the contact area between the low-voltage winding 102 and the cold air, thereby improving the heat dissipation efficiency. The heat dissipation area can be adaptively adjusted according to the wind force and the conduction temperature of the low-voltage winding 102 to meet the heat dissipation requirements of different time periods, thereby avoiding the accelerated aging of the insulation material due to the high temperature under high load, and avoiding the condensation corrosion of the winding due to the low temperature under low load.

[0038] When forced air cooling is performed, the following steps are included: First, temperature detection is performed. When the transformer is lightly loaded, the winding temperature is less than 50°C, the fan 206 is on standby, and the air outlet mechanism 300 is closed. When the temperature rises and the load increases, causing the winding temperature to exceed the preset threshold, the temperature sensor triggers a signal.

[0039] The controller then responds and starts the fan 206, and adjusts the air intake through the solenoid valve 207. The air is evenly injected into the air duct 104 through the air inlet hopper 212, the filter 205, the annular tube 203, and the air inlet head 202. The air filter element 208 and the filter screen 209 inside the air filter 205 filter impurities in the air to prevent the air duct 104 from being contaminated and blocked, which affects the heat dissipation efficiency.

[0040] When the cold air flows inside the air duct 104, the low-voltage winding 102 and the high-voltage winding 103 are cooled, and as the air pressure in the air duct 104 increases, the closing cover 306 of the air outlet 303 is pushed open and the hot air is discharged. When the closing cover 306 is pushed out, the closing cover 306 rotates on the top of the support ring 305 and drives the reset spring 307 to extend upward. When the wind force decreases, the reset spring 307 retracts and drives the closing cover 306 to reset.

[0041] The air volume is matched as follows: At high load, the temperature is greater than 70°C, and the fan 206 runs at full speed with an air volume of 5m³ / s to quickly cool down the temperature; At medium load, the temperature is 50~70℃, and the air volume is adjusted according to the PID algorithm to maintain a stable temperature; At low load, the temperature is less than 50° C., and the fan 206 runs intermittently or is turned off to save energy and reduce noise.

[0042] When cooling the low-voltage winding 102, the heat below the winding 102 is transferred to the heat-conducting fins 402 through the heat-conducting ring 401. When the cold air flows through the surface of the heat-conducting fins 402, the heat is taken away, and the heat dissipation efficiency is improved by 30%. The heat-conducting fins 402 are a fluid mechanics structure in the shape of fish gills. When the heat-conducting fins 402 are working, the heat-conducting phase change material 406 melts and absorbs heat, delaying the temperature rise. After the temperature drops, the material solidifies and releases heat to maintain the continuity of heat dissipation. The heat-conducting phase change material 406 is converted from solid to liquid. Then the memory alloy spring 412 is heated and elongated, pulling the elastic hollow tube 409 and the fixing part 410 to extend. The fixing part 410 at the top drives the first rotating part 408 to rotate. The first rotating part 408 drives the aluminum alloy fins 404 to expand. The increased wind force impacts the bottom of the aluminum alloy fins 404, also driving them to expand outward, increasing their bottom The contact area between the aluminum alloy fin 404 and the cold air is increased, thereby expanding the heat dissipation area. When the aluminum alloy fin 404 rotates, it drives the flexible silicone member 407 to bend and deform upward. The heat of the low-voltage winding 102 is dissipated into the cold air through conduction of the heat-conducting ring 401, the flexible silicone member 407, the heat-conducting phase change material 406 and the aluminum alloy fin 404. When in a low temperature state, the memory alloy spring 412 restores the wind force to decrease, and the aluminum alloy fin 404 retracts inward to reduce wind resistance. A hollow cavity 405 is provided inside the aluminum alloy fin 404 to reduce its weight and make it easier to unfold and store.

Claims

1. A temperature-resistant 35kV dry-type transformer for energy storage, comprising a transformer mechanism (100), characterized in that: An air inlet mechanism (200) is installed at the bottom of the transformer mechanism (100), an air outlet mechanism (300) is installed at the top of the transformer mechanism (100), and a plurality of heat conducting mechanisms (400) are provided on opposite sides of the air inlet mechanism (200) and the air outlet mechanism (300), and the plurality of heat conducting mechanisms (400) are installed in the transformer mechanism (100).

2. The heat-resistant 35kV dry-type transformer for energy storage according to claim 1, characterized in that: The transformer mechanism (100) comprises a dry-type transformer body (101), a plurality of low-voltage windings (102) and a high-voltage winding (103) being mounted on the dry-type transformer body (101), and the low-voltage windings (102) are located inside the high-voltage windings (103).

3. The heat-resistant 35kV dry-type transformer for energy storage according to claim 2, characterized in that: An air duct (104) is provided on the surface of the low-voltage winding (102) and the inner wall of the high-voltage winding (103); the air inlet mechanism (200) is installed at the bottom of the inner cavity of the air duct (104); the air outlet mechanism (300) is installed at the top of the inner cavity of the air duct (104); and the heat conduction mechanism (400) is installed in the inner cavity of the air duct (104) and is located on a side opposite to the air inlet mechanism (200) and the air outlet mechanism (300).

4. The heat-resistant 35kV dry-type transformer for energy storage according to claim 3, characterized in that: The air inlet mechanism (200) comprises a first annular sealing plate (201), the first annular sealing plate (201) being fixedly connected to the bottom of the inner cavity of the air duct (104), an air inlet head (202) being installed around the interior of the first annular sealing plate (201), and an annular pipe (203) being connected to the bottom of the air inlet head (202).

5. The heat-resistant 35kV dry-type transformer for energy storage according to claim 4, characterized in that: The air inlet end of the annular tube (203) is connected to a curved tube (204), the air inlet end of the curved tube (204) is connected to a solenoid valve (207), the air inlet end of the solenoid valve (207) is connected to a fan (206), and the air inlet end of the fan (206) is connected to an air filter (205).

6. The heat-resistant 35kV dry-type transformer for energy storage according to claim 5, characterized in that: The air inlet end of the air filter (205) is connected to an air inlet hopper (212), the air outlet end of the air filter (205) is connected to a connecting pipe (210), and the connecting pipe (210) is connected to the air inlet end of the fan (206).

7. The heat-resistant 35kV dry-type transformer for energy storage according to claim 6, characterized in that: An air filter element (208) and a filter screen (209) are installed in the inner cavity of the air filter (205), and an inspection cover (211) is installed on the top of the air filter (205).

8. The heat-resistant 35kV dry-type transformer for energy storage according to claim 7, characterized in that: The air outlet mechanism (300) comprises a second annular sealing plate (301), the second annular sealing plate (301) being fixedly connected to the top of the inner cavity of the air duct (104), a threaded hole (302) being provided around the second annular sealing plate (301), and an air outlet head (303) being threadedly connected inside the threaded hole (302).

9. The heat-resistant 35kV dry-type transformer for energy storage according to claim 8, characterized in that: The air outlet head (303) comprises a threaded seat (304), the threaded seat (304) is threadedly connected to the threaded hole (302), and a support ring (305) is fixedly connected to the top of the threaded seat (304).

10. The temperature-resistant 35kV dry-type transformer for energy storage according to claim 9, characterized in that: The top of the support ring (305) is rotatably connected to a closing cover (306), the bottom of the closing cover (306) is fixedly connected to a return spring (307), the bottom of the return spring (307) is fixedly connected to the inner wall of the threaded seat (304), and the return spring (307) is arranged obliquely.

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