Oil-immersed energy storage transformer structure suitable for container installation

Abstract

The oil-immersed energy storage transformer structure suitable for container installation comprises a main box body and an oil storage tank, the oil storage tank is arranged above the main box body, the oil storage tank is horizontally flush with the top face of the main box body, a terminal box is arranged on the outer side of one end of the oil storage tank, and the terminal box is arranged on the outer side of the other end of the oil storage tank. The front side and the rear side of the oil storage tank are flush with the front side and the rear side of the main box body, radiators are arranged on the outer side of the main box body in a protruding mode, a pluggable terminal is arranged on one side of the front face of the main box body, and dry type conducting rods are arranged below the radiators at the two ends of the main box body. Compared with a traditional product, the overall structure of the novel oil-immersed energy storage transformer suitable for container installation has very obvious advantages, and the conditions of container installation and transportation under various working conditions are completely met. The size in the width direction is reduced by 40%, the size in the height direction is reduced by 30%, the overall project scheme arrangement requirement can be met in the length direction, and the expected design effect is achieved.

Description

Technical Field

[0001] This article belongs to the technical field of energy storage transformers, and specifically relates to an oil-immersed energy storage transformer structure suitable for container installation. Background Art

[0002] Containerized energy storage substations install energy storage units within standardized containers. These containers contain an energy management system (EMS), a power storage converter (PCS), a thermal management system, an energy storage transformer, and other control hardware. These ultra-large-capacity, portable "power banks" can be directly delivered to locations where power is needed, connecting to the grid via a quick interface to store and release energy.

[0003] The containers currently used in energy storage substations are roughly categorized into two types: 20-foot flatbed and 40-foot high cabinets, with length, width, and height measuring 5.89m x 2.35m x 2.38m and 12m x 2.35m x 2.71m, respectively. For example, a 40-foot containerized substation is installed with an SF-6000 / 33 / 0.69 x 2 dual low-voltage oil-immersed energy storage transformer. Excluding the frame and reinforcement beams, as well as the dimensions occupied by the PCS and control cabinet, the installation space for the transformer is only 3.4m×2.28m×2.45m. The high-voltage bushing is a 35kV pure porcelain bushing, about 800mm high, located on the box cover. The bushings need to maintain an insulation distance of more than 380mm, and the inside of the bushing must be filled with insulating oil. Therefore, the minimum oil level in the oil storage tank must be higher than the bushing. This is one of the reasons why the conventional solution with a height of 3390mm cannot meet the requirements of container installation. In addition, the pure porcelain bushing is not suitable for shipping with the transformer due to the risk of rupture, and can only be disassembled for transportation. The low-voltage bushing is a pure porcelain bushing with almost the same characteristics as the high-voltage bushing. Figure 3 、 Figure 4 shown.

[0004] Conventional oil-immersed power transformers with a capacity of 6000kVA, consistent loss values, impedance, and other parameters, have dimensions of 3.2m × 3.5m × 3.4m. These dimensions, both in width and height, severely fail to meet the requirements for containerized installation. Therefore, it became necessary to develop an oil-immersed energy storage transformer that meets these requirements. Utility Model Content

[0005] In order to solve the above problems, this paper proposes an oil-immersed energy storage transformer structure suitable for container installation. The energy storage transformer includes a main box and an oil storage tank. The oil storage tank is provided above the main box, and the oil storage tank is horizontally flush with the top surface of the main box. The outer surface of the oil storage tank is horizontally provided with an oil level gauge, and a terminal box is provided on the outside of one end of the oil storage tank. The front and rear sides of the oil storage tank are flush with the front and rear sides of the main box. The length of the oil storage tank is less than the length of the main box. The outer side of the main box is provided with a radiator in a protruding manner, and a plug-in terminal is provided on the front side of the main box. Dry-type conductive rods are provided under the radiator at both ends of the main box, and box cover brackets are provided on both sides of the inner wall of the main box. The bottom surface of the main box is provided with a flat base. The overall structure of the new oil-immersed energy storage transformer suitable for container installation has obvious advantages compared with traditional products, and fully meets the conditions for container installation and transportation under various working conditions. The width is 40% smaller than the traditional size, and the height is 30% smaller than the traditional size. At the same time, the length direction can also meet the overall layout requirements of the project and achieve the expected design effect. The transformer has passed all routine factory tests and related type tests.

[0006] The main box is in the shape of a rectangular box, with electrical components arranged inside the main box, an assembly opening provided on the top surface of the main box, and radiators protruding from the four outer surfaces of the main box. A box cover is provided on the inner side of the top surface of the assembly opening of the main box, and plug-in terminals are provided adjacent to one side of the front of the main box. The oil storage tank is in the shape of a flat long cabinet, lying horizontally on the top of the main box, with oblique cut edges provided on the front and back sides of the oil storage tank, one end of the oil storage tank is adjacent to the end face of the main box, and the other end of the oil storage tank is concavely arranged on the inner side of the end face of the main box. By developing a new oil storage tank structure and changing its installation position, the length of the transformer is shortened, sufficient space is reserved for the radiator, and the temperature rise is guaranteed to meet the use requirements.

[0007] The radiators are all vertical side-by-side radiators, and are respectively arranged on the front, rear, left and right outer surfaces of the main box. The height of the radiators on the front and rear sides of the main box is the same as the height of the main box, and the height of the radiators on the left and right sides of the main box is less than the height of the main box. Dry conductive rods are horizontally provided under the radiators on the left and right sides, and plug-in terminals are provided adjacent to one side of the front radiator. By changing the installation method and position of the radiator, the overall volume of the transformer is reduced to meet the container installation conditions.

[0008] The plug-in terminal is in the shape of a rectangular box. The plug-in terminal is protruding from the front of the main box. The thickness of the plug-in terminal is less than that of the radiator. The high and low voltage outlet methods are optimized. The high voltage adopts the side outlet and the low voltage adopts the short-axis double-side outlet structure. Combined with the use of the rising seat, it not only reduces the length of the fuel tank, but also saves the use of fuel tank steel plate materials and insulating oil.

[0009] The dry-type conductive rods are horizontally protruding rods, mounted below both ends of the main box via brackets. The outer end faces of the dry-type conductive rods are retracted inwards from the upper heat sink end faces. This optimizes the transformer's high- and low-voltage terminal structures, with plug-in terminals for high-voltage terminals and TED epoxy resin conductive rods for low-voltage terminals replacing conventional pure porcelain bushings. This new layout further reduces transformer space.

[0010] The terminal box is located on the outside of the upper end of the main box body. A nameplate is provided on the outside of the terminal box and a temperature controller is provided at the end of the terminal box. The installation positions of the terminal box, temperature control instrument, oil level gauge and nameplate are optimized to match this structural transformer and facilitate on-site inspection personnel to observe and record data.

[0011] The base is a flat plate base with assembly cams at the four corners. The main box is fixed on the upper surface of the base. Several reinforcing ribs are provided between the upper surface of the base and the side of the main box. An installation method is designed to fix the transformer on the container base to ensure that the transformer does not move during long-distance sea transportation.

[0012] Beneficial effects:

[0013] The overall structure of the new container-mounted oil-immersed energy storage transformer offers significant advantages over traditional products, fully satisfying container installation and transportation requirements under various operating conditions. It is 40% smaller in width and 30% smaller in height than traditional dimensions, while also meeting the overall project layout requirements in terms of length, achieving the desired design results. The transformer has passed all standard factory tests and relevant type tests.

[0014] By developing a new oil storage tank structure and changing its installation position, the length of the transformer is shortened, leaving enough space for the radiator to ensure that the temperature rise meets the usage requirements.

[0015] By changing the installation method and position of the radiator, the overall volume of the transformer can be reduced to meet the conditions for containerized installation.

[0016] The high and low voltage outlet methods are optimized. The high voltage adopts the side outlet, and the low voltage adopts the short-axis double-side outlet structure. Combined with the use of the rising seat, it not only reduces the length of the fuel tank, but also saves the use of fuel tank steel plate materials and insulating oil.

[0017] The transformer's high- and low-voltage terminal structures have been optimized, with plug-in terminals used for high-voltage terminals and TED epoxy resin conductive rods used for low-voltage terminals, replacing conventional pure porcelain bushings. Combined with this new layout, transformer space is further reduced.

[0018] Due to changes in the high and low voltage wiring, the cover cannot be connected to the transformer body. Traditionally, the transformer body and cover are connected together to secure the transformer. Therefore, a new method of securing the transformer body was needed.

[0019] The installation positions of the terminal box, temperature control instrument, oil level gauge and nameplate are optimized so that they are compatible with the transformer structure and convenient for on-site inspection personnel to observe and record data.

[0020] Design an installation method that can fix the transformer on the container base to ensure that the transformer does not move during long-distance sea transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of the structure of an oil-immersed energy storage transformer suitable for container installation;

[0022] Figure 2 This is an internal side view of the structure of an oil-immersed energy storage transformer suitable for container installation;

[0023] Figure 3 This is the main view of the existing oil-immersed energy storage transformer structure;

[0024] Figure 4 It is an internal side view of the existing oil-immersed energy storage transformer structure;

[0025] In the figure; 1. Oil storage tank, 2. Plug-in terminal, 3. Dry conductive rod, 4. Oil level gauge, 5. Radiator, 6. Terminal box, 7. Nameplate, 8. Temperature controller, 9. Base, 10. Box cover bracket, 11. High-voltage bushing, 12. Low-voltage bushing. DETAILED DESCRIPTION

[0026] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0027] Oil storage tank 1, plug-in terminal 2, dry conductive rod 3, oil level gauge 4, radiator 5, terminal box 6, nameplate 7, temperature controller 8, base 9, box cover bracket 10, high-voltage bushing 11, low-voltage bushing 12.

[0028] like Figure 1 、 2 As shown;

[0029] A structure of an oil-immersed energy storage transformer suitable for container installation, the energy storage transformer includes a main box body and an oil storage tank, an oil storage tank is provided above the main box body, the oil storage tank is horizontally flush with the top surface of the main box body, an oil level gauge 4 is horizontally provided on the outer surface of the oil storage tank, a terminal box 6 is provided on the outer side of one end of the oil storage tank, the front and rear sides of the oil storage tank are flush with the front and rear sides of the main box body, the length of the oil storage tank is less than the length of the main box body, a radiator 5 is protruding on the outer side of the main box body, a plug-in terminal 2 is provided on the front side of the main box body, and dry-type conductors are provided below the radiator 5 at both ends of the main box body. The pole 3, the inner wall of the main box is provided with a box cover bracket 10 on both sides, the bottom surface of the main box is provided with a flat base 9, the main box is in the shape of a rectangular box, the interior of the main box is provided with electrical components, the top surface of the main box is provided with an assembly opening, the outer four surfaces of the main box are protruding with a radiator 5, the assembly opening of the main box is provided with a box cover on the inside of the top surface, the front side of the main box is provided with a plug-in terminal 2, the shape of the oil tank 1 is a flat long cabinet, the oil tank 1 is horizontally arranged above the main box, the front and rear sides of the oil tank 1 are provided with oblique cut edges, one end of the oil tank 1 is aligned with the end face of the main box Adjacent, the other end of the oil storage tank 1 is concavely arranged on the inner side of the end surface of the main box body, the radiators 5 are all vertical side-by-side radiators 5, and the radiators 5 are respectively arranged on the front, rear, left and right outer surfaces of the main box body. The height of the radiators 5 on the front and rear sides of the main box body is the same as the height of the main box body, and the height of the radiators 5 on the left and right sides of the main box body is less than the height of the main box body. The lower parts of the radiators 5 on the left and right sides are horizontally provided with dry conductive rods 3, and the plug-in terminal 2 is provided adjacent to the side of the front radiator 5. The plug-in terminal 2 is in the shape of a rectangular box body, and the plug-in terminal 2 is protruding from the main box body. On the front side, the thickness of the plug-in terminal 2 is less than the thickness of the radiator 5. The dry-type conductive rod 3 is a transverse protruding rod. The dry-type conductive rod 3 is arranged under the two ends of the main box through a bracket. The outer end face of the dry-type conductive rod 3 is retracted into the inner side of the end face of the upper radiator 5. The terminal box 6 is arranged on the outer side of the upper end of the main box. A nameplate 7 is provided on the outer surface of the terminal box 6. A temperature controller 8 is provided at the end of the terminal box 6. The base 9 is a flat plate base 9. The four corners of the base 9 are provided with assembly convex corners. The upper surface of the base 9 is fixed with the main box, and a number of reinforcing ribs are provided between the upper surface of the base 9 and the side of the main box.

[0030] Implementation examples;

[0031] The existing oil storage tank 1 is located on the upper right side. After including the oil storage tank 1, the overall transformer height reaches 3390mm and the length reaches 3150mm. The oil storage tank 1 in this article is located on the upper part of the box cover and does not occupy the length space. The total height including the oil storage tank 1 is 2438mm.

[0032] The existing high-voltage bushing 11 is a 35kV pure porcelain bushing, about 800mm high, located on the box cover. The insulation distance between the bushings needs to be more than 380mm, and the inside of the bushing must be filled with insulating oil. Therefore, the minimum oil level of the oil storage tank 1 needs to be higher than the bushing. This is one of the reasons why the height of 3390mm in the conventional solution cannot meet the requirements of container installation. In addition, the pure porcelain bushing is not suitable for sea transportation with the transformer. There is a risk of cracking, and it can only be disassembled for transportation. The terminal in this article is a plug-in terminal, which does not require external insulation distance assurance, is compact in size, and can be transported with the transformer as a whole after installation. It is installed on the side wall of the transformer without affecting the overall size of the transformer;

[0033] The existing low-voltage bushing 12 is a pure porcelain bushing with characteristics similar to the high-voltage bushing 11. The one in this article is a TED dry-type conductive rod 3 cast in epoxy resin, with a cantilever resistance of 3150N. Combined with the raised base protruding from the bottom of the oil tank, the overall size is compact, fully meeting the requirements for sea transportation with the transformer.

[0034] The existing oil level gauge 4 is installed on the side of the oil tank 1, which is convenient for inspection personnel to check. Figure 2 If the oil level gauge 4 is installed on the long axis side wall of the oil tank 1, it is convenient for the inspectors to observe and record the oil level.

[0035] The existing radiators 5 are arranged symmetrically on the high and low voltage sides of the oil tank, which significantly affects the overall width of the transformer, reaching 3480mm, seriously exceeding the specified width of the container. The radiator 5 in this paper adopts a new circular arrangement around the perimeter, fully utilizing the heat dissipation space of the tank wall, effectively controlling the overall length and width while ensuring the temperature rise.

[0036] The existing terminal box 6, nameplate 7 and temperature controller 8 are installed on the box wall. This position is occupied by the radiator 5 in this article. Therefore, the terminal box 6, nameplate 7 and temperature controller 8 are all assembled on a detachable bottom plate, which is fixed to the box cover by screws in a position convenient for observation.

[0037] The existing channel steel for the transformer base 9 is 200 mm high and is used to be located on a concrete foundation, which seriously affects the height size of the transformer and is not suitable for container-mounted transformers. The bottom of the transformer box in this article is a 12 mm thick steel plate with fixing holes on the plate for fixing the transformer to the container base 9 by bolts.

[0038] The existing bracket is welded under the box cover, which cooperates with the clamp on the device body and connects the two together with bolts to fix the device body so that it cannot move in the fuel tank. In this article, due to the new installation method of the high and low pressure bushings 12, the box cover and the device body cannot be directly connected. A new method of fixing the device body is first developed, that is, welding a round steel bracket on the inside of the box wall and connecting the device body to the round steel bracket through flat steel.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An oil-immersed energy storage transformer structure suitable for container installation, the energy storage transformer includes a main box body and an oil storage tank, and the oil storage tank is provided above the main box body, characterized in that: The oil storage tank is horizontally flush with the top surface of the main box body, an oil level gauge is horizontally provided on the outer surface of the oil storage tank, a terminal box is provided on the outer side of one end of the oil storage tank, the front and rear sides of the oil storage tank are flush with the front and rear sides of the main box body, the length of the oil storage tank is smaller than the length of the main box body, a radiator is protruding on the outer side of the main box body, a plug-in terminal is provided on the front side of the main box body, dry conductive rods are provided under the radiator at both ends of the main box body, box cover brackets are provided on both sides of the inner wall of the main box body, and a flat base is provided on the bottom surface of the main box body.

2. The oil-immersed energy storage transformer structure suitable for container installation according to claim 1, characterized in that: The main box is in the shape of a rectangular box, with electrical components arranged inside the main box, an assembly opening arranged on the top surface of the main box, radiators protruding from the four outer surfaces of the main box, a box cover arranged on the inner side of the top surface of the assembly opening of the main box, and a plug-in terminal arranged adjacent to one side of the front side of the main box.

3. The oil-immersed energy storage transformer structure suitable for container installation according to claim 1, characterized in that: The oil storage tank is shaped like a flat long cabinet. The oil storage tank is arranged horizontally above the main box body. The front and rear sides of the oil storage tank are provided with oblique cut edges. One end of the oil storage tank is adjacent to the end face of the main box body, and the other end of the oil storage tank is arranged in a concave manner on the inner side of the end face of the main box body.

4. The oil-immersed energy storage transformer structure suitable for container installation according to claim 1, characterized in that: The radiators are all vertical side-by-side radiators, and are respectively arranged on the front, rear, left and right outer surfaces of the main box body. The height of the radiators on the front and rear sides of the main box body is the same as the height of the main box body, and the height of the radiators on the left and right sides of the main box body is less than the height of the main box body. Dry conductive rods are horizontally provided under the radiators on the left and right sides, and a plug-in terminal is provided adjacent to one side of the front radiator.

5. The oil-immersed energy storage transformer structure suitable for container installation according to claim 1, characterized in that: The plug-in terminal is in the shape of a rectangular box body, and is protrudingly arranged on the front of the main box body. The thickness of the plug-in terminal is smaller than that of the radiator.

6. The oil-immersed energy storage transformer structure suitable for container installation according to claim 1, characterized in that: The dry conductive rod is a transverse protruding rod, which is arranged below both ends of the main box through a bracket, and the outer end surface of the dry conductive rod is retracted inside the upper radiator end surface.

7. The oil-immersed energy storage transformer structure suitable for container installation according to claim 1, characterized in that: The terminal box is arranged on the outer side of the upper end of the main box body, a nameplate is arranged on the outer surface of the terminal box, and a temperature controller is arranged at the end of the terminal box.

8. The oil-immersed energy storage transformer structure suitable for container installation according to claim 1, characterized in that: The base is a flat plate base, with assembly convex corners at the four corners of the base. The main box body is fixed on the upper surface of the base, and a number of reinforcing ribs are provided between the upper surface of the base and the side of the main box body.

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