A transformer for a photovoltaic booster station

Abstract

The application discloses a transformer for a photovoltaic voltage boosting station, and belongs to the technical field of transformers. The transformer is provided with a heat dissipation pipeline in underground soil. The heat dissipation pipeline is in communication with heat-conducting oil in a transformer shell. The heat-conducting oil in the transformer shell completes heat exchange with the soil with a lower underground temperature, thereby cooling the transformer and improving the cooling effect of the transformer. A mobile lifting structure is arranged below the transformer shell. The mobile lifting structure can freely move and lift the whole transformer, facilitates the free movement of the transformer, and also facilitates the installation of the transformer in the photovoltaic voltage boosting station.

Description

Technical Field

[0001] This invention relates to a transformer for photovoltaic booster stations, belonging to the technical field of transformers. Background Technology

[0002] A photovoltaic booster station is a facility that steps up the voltage of the electricity generated by photovoltaic modules. Because the voltage of the electricity generated by photovoltaic modules is relatively low, a lot of energy will be lost if it is directly transmitted to the power grid. Therefore, it is necessary to use a booster station to raise the voltage to a level that meets the requirements of the power grid. Thus, a photovoltaic booster station is an indispensable component of photovoltaic power generation.

[0003] The transformer in a photovoltaic (PV) step-up substation is the core component that steps up the electrical energy generated by the PV modules to meet the high voltage requirements of the power grid. During the process of transforming low voltage into high voltage, the transformer coils generate a large amount of heat when current flows through them due to their own resistance. To dissipate this heat, the transformer casing is usually filled with heat-conducting oil, and heat sinks are added to the outside of the casing. The heat inside the transformer is dissipated through the heat conduction of the oil. However, this method of heat dissipation is not very effective. In addition, because the space inside a PV step-up substation is small, and most PV step-up substations are built in places with abundant sunlight, the temperature inside the substation is high, making the heat sink method of heat dissipation unsuitable. This often causes the transformer inside the PV step-up substation to overheat and stop working, affecting the working efficiency of the transformer inside the PV step-up substation.

[0004] In addition, transformers are generally quite heavy, and most photovoltaic booster stations are built in areas with inconvenient roads. Large lifting equipment cannot enter or exit in narrow roads, making it extremely inconvenient to move and transport transformers during installation in the booster station. To address these issues, some people in the field have developed a transformer for photovoltaic booster stations to overcome the problems mentioned in the background. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a transformer for photovoltaic step-up substations, which addresses the above-mentioned shortcomings. The present invention can guide the heat transfer oil in the transformer shell into the ground to complete heat exchange with the soil with a lower temperature below the surface, thereby improving the heat dissipation efficiency of the transformer during operation. The lower surface of the transformer shell is also provided with a movable lifting structure, which makes the installation of the transformer in the photovoltaic step-up substation convenient and quick.

[0006] To solve the above technical problems, the present invention adopts the following technical solution:

[0007] A transformer for a photovoltaic booster station includes a casing, inside which are windings arranged in a straight and balanced manner. The windings are connected internally by an iron core. A terminal block is fixed to the upper surface of the casing. An oil supply pipe is provided at the upper part of the casing, and an oil return pipe is provided at the lower part of the casing. A circulation pump and a heat dissipation pipe are provided between the lower ends of the oil supply pipe and the lower ends of the oil return pipe. The circulation pump and heat dissipation pipe are located below the surface of the photovoltaic booster station. An oil supply valve is provided on the oil supply pipe, and a temperature sensor is provided on the oil return pipe. A movable lifting structure is also provided on the lower surface of the casing.

[0008] Furthermore, the movable lifting structure includes a support leg, which is fixed to the lower surface of the housing. Parallel plates are fixed to the upper and lower parts of the support leg, and lifting conical wheels are provided between the parallel plates.

[0009] Furthermore, the lifting conical wheel and the parallel plate have a through hole in the center, and a wheel axle passes through the through hole of the lifting conical wheel and the parallel plate. The outer surface of the wheel axle and the inner surface of the lifting conical wheel are engaged by threads, and a universal wheel is provided at the lower end of the wheel axle.

[0010] Furthermore, the movable lifting structure also includes a horizontal plate, which is fixed to the lower surface of the housing. There are two horizontal plates arranged in parallel, and a drive column runs through the two ends of the horizontal plate.

[0011] Furthermore, drive conical wheels are fixed to both ends of the drive column, and an intermediate conical wheel is provided between the drive conical wheels. The intermediate conical wheel is fixed to the surface of the drive column, and the drive conical wheels mesh with the lifting conical wheels. A vertical plate is also fixed between the horizontal plates.

[0012] Furthermore, there are two vertical plates, with a connecting shaft running through them. Synchronous conical wheels are fixed to both ends of the connecting shaft, and the synchronous conical wheels mesh with the middle conical wheel. A rocking component is also fixed to the surface of the synchronous conical wheel at one end of the connecting shaft.

[0013] Furthermore, the rocking assembly includes a rocker arm, which is fixed to the surface of the synchronous conical wheel. The end surface of the rocker arm has rocker arm recesses, and a cylindrical pin and a spring are provided in the rocker arm recesses.

[0014] Furthermore, the rocker arm is also provided with a telescopic cylinder, a rotating arm is fixedly connected to the end surface of the telescopic cylinder, and through holes are provided on the cylinder walls at both ends of the telescopic cylinder, and a locking pin is provided in the through hole of the telescopic cylinder.

[0015] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0016] 1. The photovoltaic booster station of this invention has a heat dissipation pipe installed in the underground soil. The heat dissipation pipe is connected to the heat transfer oil in the transformer shell. The heat transfer oil in the heat dissipation pipe exchanges heat with the underground soil with a lower temperature. By utilizing the principle that the underground soil temperature is lower and fluctuates less, the transformer is cooled down, thereby improving the transformer cooling effect.

[0017] 2. The present invention provides a movable lifting structure below the transformer casing. The movable lifting structure includes a support leg, which is fixed to the lower surface of the casing. Parallel plates are fixed to the upper and lower parts of the support leg. A lifting conical wheel is provided between the parallel plates. A through hole is provided in the center of the lifting conical wheel and the parallel plate. An axle passes through the through hole of the lifting conical wheel and the parallel plate. The outer surface of the axle and the inner surface of the lifting conical wheel are engaged by threads. A universal wheel is provided at the lower end of the axle. By rotating the lifting conical wheel, the axle can be lifted and lowered within the parallel plate, thereby realizing the lifting and lowering of the entire transformer. The movement of the universal wheel facilitates the free movement of the transformer and also makes the installation of the transformer in the photovoltaic step-up station convenient and quick. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale and orientation.

[0019] Figure 1 This is a schematic diagram of the structural connection of the present invention;

[0020] Figure 2 This is a cross-sectional view of the connection between the housing and the movable lifting structure in this invention;

[0021] Figure 3 This is a cross-sectional view of the connection between the housing and the rocking assembly structure of the present invention.

[0022] In the diagram: 1-Housing, 2-Terminal, 3-Winding, 4-Oil supply pipe, 5-Oil return pipe, 6-Oil supply valve, 7-Temperature sensor, 8-Circulating pump, 9-Spring, 10-Heat dissipation pipe, 11-Support leg, 12-Parallel plate, 13-Axle, 14-Universal wheel, 15-Lifting conical wheel, 16-Horizontal plate, 17-Drive column, 18-Drive conical wheel, 19-Vertical plate, 20-Connecting shaft, 21-Synchronous conical wheel, 22-Intermediate conical wheel, 23-Rocking assembly, 24-Rock arm, 25-Locking column, 26-Telescopic cylinder, 27-Rotating arm, 28-Rock arm recess, 29-Cylindrical pin. Detailed Implementation

[0023] like Figure 1 and Figure 2As shown, a transformer for a photovoltaic booster station includes a housing 1. The housing 1 contains three windings 3 arranged in a straight, balanced manner. The windings 3 are internally connected by an iron core. A plurality of terminals 2 are fixedly connected to the upper surface of the housing 1. These terminals 2 are used for connecting the windings 3 in the transformer to the low-voltage and high-voltage systems within the photovoltaic booster station. An oil supply pipe 4 is located at the upper part of the housing 1, and a return oil pipe 5 is located at the lower part of the housing 1. A circulation pump 8 and a heat dissipation pipe 10 are located between the lower ends of the oil supply pipe 4 and the return oil pipe 5. The circulation pump 8 and the heat dissipation pipe 10 are located below the surface of the photovoltaic booster station. An oil supply valve 6 is installed on the oil supply pipe 4, and a temperature sensor 7 is installed on the return oil pipe 5. A movable lifting structure is also provided on the lower surface of the housing 1.

[0024] The movable lifting structure includes four support legs 11, which are fixed to the lower surface of the housing 1. Parallel plates 12 are fixed to the upper and lower parts of the support legs 11. Lifting conical wheels 15 are provided between the parallel plates 12. A through hole is provided in the center of the lifting conical wheels 15 and the parallel plates 12. A wheel axle 13 passes through the through hole of the lifting conical wheels 15 and the parallel plates 12. The outer surface of the wheel axle 13 and the inner surface of the lifting conical wheels 15 are engaged by threads. A universal wheel 14 is provided at the lower end of the wheel axle 13.

[0025] The movable lifting structure also includes a horizontal plate 16, which is fixed to the lower surface of the housing 1. There are two horizontal plates 16 arranged in parallel. A drive column 17 passes through the two ends of the horizontal plate 16. Drive conical wheels 18 are fixed to both ends of the drive column 17. An intermediate conical wheel 22 is also provided between the drive conical wheels 18. The intermediate conical wheel 22 is fixed to the surface of the drive column 17. The drive conical wheel 18 meshes with the lifting conical wheel 15.

[0026] Vertical plates 19 are also fixedly connected between the horizontal plates 16. There are two vertical plates 19, and a connecting shaft 20 passes through between the vertical plates 19. Synchronous conical wheels 21 are fixedly connected to both ends of the connecting shaft 20. The synchronous conical wheels 21 and the middle conical wheel 22 mesh with each other. A rocking component 23 is also fixedly connected to the surface of the synchronous conical wheel 21 at one end of the connecting shaft 20.

[0027] like Figure 3 As shown, the rocking assembly 23 includes a rocker arm 24, which is fixed to the surface of the synchronous conical wheel 21. The end surface of the rocker arm 24 has rocker arm recesses 28, which are symmetrically distributed in two. A cylindrical pin 29 and a spring 9 are provided in the rocker arm recesses 28.

[0028] The rocker arm 24 is also provided with a telescopic cylinder 26. A rotating arm 27 is fixedly connected to the end surface of the telescopic cylinder 26. There are two rotating arms 27, which are symmetrically distributed on the end surface of the telescopic cylinder 26. Through holes are also provided on the cylinder walls at both ends of the telescopic cylinder 26. The diameter of the through hole on one side of the inner surface of the telescopic cylinder 26 is larger than the diameter of the through hole on one side of the outer surface of the telescopic cylinder 26. A locking pin 25 is also provided in the through hole of the telescopic cylinder 26. The diameter of the middle part of the locking pin 25 is slightly smaller than the diameter of both ends. Normally, the locking pin 25 located on the surface of the cylindrical pin 29 is held in place by the elastic action of the spring 9. The pin 29 is inserted into the through hole of the telescopic cylinder 26, the locking pin 25 is exposed on the outer surface of the telescopic cylinder 26, and the cylindrical pin 29 locks the telescopic cylinder 26 to prevent the telescopic cylinder 26 from rotating on the surface of the rocker arm 24 and to prevent the telescopic cylinder 26 from extending from the bottom of the housing 1. The operator presses the locking pin 25 exposed on the outer surface of the telescopic cylinder 26 into the through hole of the telescopic cylinder 26, the cylindrical pin 29 retracts into the rocker arm recess 28, the cylindrical pin 29 disengages from the inner wall of the telescopic cylinder 26, and the telescopic cylinder 26 is released. At the same time, the operator pulls the rotating arm 27 and the telescopic cylinder 26 out from the bottom of the housing 1.

[0029] As the telescopic cylinder 26 extends below the housing 1, when the cylindrical pin 29 passes the surface of the locking pin 25 at the other end of the telescopic cylinder 26, the locking pin 25 at the other end is pushed out of the outer surface of the telescopic cylinder 26 by the action of the spring 9. The cylindrical pin 29 then enters the through hole at the other end of the telescopic cylinder 26 and locks the telescopic cylinder 26 again. The operator grips the rotating arm 27 and rotates it in a certain direction. The rocker arm 24 and the telescopic cylinder 26 rotate, and the connecting shaft 20 and the synchronous conical wheels 21 at both ends of it also rotate with the rocker arm 24. The intermediate conical wheel 22, which meshes with the synchronous conical wheel 21, rotates with the synchronous conical wheel 21. The rotation of the synchronous conical wheel 21 drives the drive pin 17 and the drive conical wheel 18 to rotate. Thus, the lifting conical wheel 15, which meshes with the drive conical wheel 18, rotates with the drive conical wheel 18.

[0030] The rotation of the lifting conical wheel 15 causes the wheel axle 13 inside the lifting conical wheel 15 to rotate through the threaded engagement. Since the lifting conical wheel 15 is located between the parallel plates 12, it cannot be raised or lowered. Through the principle of action and reaction forces, the wheel axle 13 descends in the through hole of the parallel plate 12, lifting the transformer housing 1 to a certain height. The operator then pushes the transformer to the designated location in the substation for installation.

[0031] When the transformer is moved to the designated location within the substation, the operator rotates the rotating arm 27 in the opposite direction, repeating the above-described process of the moving and lifting structure. The axle 13 rises within the through hole of the parallel plate 12, and the transformer housing 1 descends to a certain height. Then, the operator fixes the housing 1 to the mounting channel steel below. Subsequently, the operator pinches the locking pin 25 on the surface of the cylindrical pin 29, pressing the cylindrical pin 29 into the rocker arm recess 28. The cylindrical pin 29 disengages from the inner wall of the telescopic cylinder 26, releasing the telescopic cylinder 26. At the same time, the operator pushes the rotating arm 27 and the telescopic cylinder 26 back to their original positions below the housing 1.

[0032] By moving the lifting structure, the operator can simultaneously raise and lower the transformer to a certain height in all four directions, making the overall movement of the transformer more convenient and faster during the installation process within the photovoltaic booster station.

[0033] After the transformer housing 1 is fixedly installed, the operator connects the oil supply pipe 4 and the oil return pipe 5 to the housing 1, opens the oil supply valve 6, starts the circulation pump 8, and the heat transfer oil in the housing 1 flows between the oil supply pipe 4 and the oil return pipe 5. The heat generated in the transformer is released into the cooler soil through the heat dissipation pipe 10, which can quickly dissipate heat and cool down the transformer. The temperature sensor 7 is used to detect the temperature of the circulating heat transfer oil in the oil return pipe 5.

[0034] The description of this invention is provided for illustrative purposes and is not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A transformer for a photovoltaic step-up substation, characterized in that: Includes a housing (1), and the lower surface of the housing (1) is also provided with a movable lifting structure; The movable lifting structure includes a support leg (11), which is fixed to the lower surface of the housing (1). Parallel plates (12) are fixed to the upper and lower parts of the support leg (11), and lifting conical wheels (15) are provided between the parallel plates (12). The lifting conical wheel (15) and the parallel plate (12) have through holes in the center. A wheel axle (13) passes through the through holes of the lifting conical wheel (15) and the parallel plate (12). The outer surface of the wheel axle (13) and the inner surface of the lifting conical wheel (15) are engaged by threads. A universal wheel (14) is provided at the lower end of the wheel axle (13). The movable lifting structure also includes a horizontal plate (16), which is fixed to the lower surface of the housing (1). There are two horizontal plates (16) arranged in parallel, and a drive column (17) runs through the two ends of the horizontal plate (16). Drive conical wheels (18) are fixedly connected to both ends of the drive column (17), and an intermediate conical wheel (22) is provided between the drive conical wheels (18). The intermediate conical wheel (22) is fixedly connected to the surface of the drive column (17). The drive conical wheels (18) mesh with the lifting conical wheels (15). A vertical plate (19) is also fixedly connected between the horizontal plates (16). There are two vertical plates (19), and a connecting shaft (20) runs through the vertical plates (19). Synchronous conical wheels (21) are fixed at both ends of the connecting shaft (20). The synchronous conical wheels (21) and the middle conical wheel (22) mesh with each other. A rocking component (23) is also fixed to the surface of the synchronous conical wheel (21) at one end of the connecting shaft (20). The rocking assembly (23) includes a rocker arm (24), which is fixed to the surface of the synchronous conical wheel (21). The end surface of the rocker arm (24) is provided with rocker arm recesses (28), and a cylindrical pin (29) and a spring (9) are provided in the rocker arm recesses (28). The surface of the rocker arm (24) is also provided with a telescopic cylinder (26), and a rotating arm (27) is fixedly connected to the end surface of the telescopic cylinder (26). The walls at both ends of the telescopic cylinder (26) are also provided with through holes, and a locking pin (25) is also provided in the through hole of the telescopic cylinder (26).

2. The photovoltaic step-up transformer as described in claim 1, characterized in that: The housing (1) is equipped with windings (3), which are arranged in a straight and balanced manner. The windings (3) are connected to each other through an iron core. A terminal (2) is fixed on the upper surface of the housing (1). An oil supply pipe (4) is provided on the upper part of the housing (1), and a return oil pipe (5) is provided on the lower part of the housing (1). A circulation pump (8) and a heat dissipation pipe (10) are provided between the lower end of the oil supply pipe (4) and the lower end of the return oil pipe (5). The circulation pump (8) and the heat dissipation pipe (10) are located below the surface of the photovoltaic booster station. An oil supply valve (6) is provided on the oil supply pipe (4), and a temperature sensor (7) is provided on the return oil pipe (5).

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