Outdoor oil-immersed box transformer substation oil storage method

Abstract

The invention belongs to the technical field of power equipment maintenance, and particularly relates to an outdoor oil-immersed box transformer substation oil storage method which comprises the following steps: S1, placing a box transformer substation and constructing an oil storage pool; the box transformer substation is placed on a stand column bearing platform which is 1.5 m away from the ground; a sinking plate is arranged on the peripheries of the box transformer oil tank and the cooling fins to form an oil storage pool which is arranged on the stand column bearing platform; s2, calculating the volume required to be accommodated by an oil storage pool according to the maximum oil quantity of the oil tank of the box transformer substation; s3, based on the volume of the oil storage tank, setting an internal structure and an oil-water separation structure of the oil storage tank through a communicating vessel principle; when a certain amount of water exists in the oil storage tank or oil discharged from the oil tank enters the water tank, the density of the transformer oil is about 0.9 time that of the water, and when the height of the oil water on the right side of the stainless steel pipe exceeds the height of the steel grating, a water column on the left side is pressed out, finally, it is guaranteed that residual liquid is the transformer oil, and the effects of storing the transformer oil and discharging redundant accumulated water are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of power equipment maintenance, in particular to an outdoor oil-immersed box transformer oil storage method. Background Art

[0002] With the advancement of the "dual carbon" strategy, easily developed land resources are gradually decreasing. Complex terrains such as mountains have become a valuable resource, prompting companies to increase the development of photovoltaic projects in complex mountainous terrain to meet the needs of energy transition and emission reduction targets. The design specifications for photovoltaic power stations require that outdoor electrical equipment with a single oil capacity of more than 1,000 kg must be equipped with oil storage or oil containment facilities. When oil storage or oil containment facilities are installed to accommodate 20% of the oil capacity, facilities should be provided to drain the oil to a safe location. If these requirements cannot be met, oil storage or oil containment facilities that can accommodate the entire oil capacity should be installed.

[0003] In complex mountain photovoltaic projects, box transformers are installed in the areas divided by each power generation unit. According to the fire protection requirements of the regulations, oil storage facilities are required. Most mountainous areas are steep and mainly rocky. The current common practice is to place oil-immersed transformers on relatively gentle slopes, and set trenches or bury oil storage tanks within 1m around them as oil storage facilities to meet fire protection requirements.

[0004] Current oil storage facility plans place oil tanks on hillsides. However, feedback from numerous existing projects indicates that these tanks are often buried by rainwater, making cleanup difficult and significantly inconvenient for operations and maintenance. Furthermore, the tanks lack oil-water separation, so accumulated water and oil leaks can easily cause environmental pollution. Ground-level oil tanks require significant excavation, typically in rock, and sometimes create high slopes that require slope treatment, making construction difficult and costly.

[0005] To this end, the present invention provides an outdoor oil-immersed box transformer oil storage method. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: an outdoor oil-immersed box transformer oil storage method described in the present invention comprises the following steps:

[0008] S1: Place the box transformer and construct the oil storage pool. Place the box transformer on a column base 1.5m above the ground. Then, install a sunken plate around the box transformer oil tank and heat sink to form an oil storage pool placed on the column base.

[0009] S2: Calculate the required volume of the oil storage tank based on the maximum oil volume of the transformer tank;

[0010] S3: Based on the volume of the oil storage tank, set the internal structure of the oil storage tank and the oil-water separation structure.

[0011] Preferably, the material of the column base is concrete or metal, and the top of the column base is provided with a box transformer body and an oil storage tank. The box transformer includes an oil tank and a heat sink, and the outer sides of the oil tank and the heat sink are provided with a sinking plate; the sinking plate is used to protect the oil in the oil storage tank.

[0012] Preferably, the height of the oil storage tank is set to 100 mm, and the bottom of the oil storage tank is arranged in coordination with the transformer body.

[0013] Preferably, the internal structure of the oil storage tank includes a steel grille and pebbles. The steel grille is arranged on the bottom plate of the oil storage tank. Pebbles are laid on the top of the steel grille. The height of the steel grille is set to 150 mm, and the thickness of the pebbles is set to 250 mm.

[0014] Preferably, the oil-water separation structure includes a stainless steel pipe, a steel pipe opening controllable switch and a steel pipe inlet; the stainless steel pipe is set to be U-shaped, and one end of the stainless steel pipe is set at the bottom of the oil storage tank; the other end of the stainless steel pipe is set above the oil storage tank and is set as the steel pipe inlet, and the lower edge height of the steel pipe inlet is flush with the maximum oil storage height of the oil storage tank; a steel pipe opening controllable switch is set at the bottom of the stainless steel pipe, and the steel pipe opening controllable switch is connected to an external control device.

[0015] Preferably, the end of the stainless steel pipe away from the steel pipe inlet is connected to a galvanized steel pipe, and the galvanized steel pipe is embedded in the bottom plate of the oil storage tank; a steel wire mesh is provided at the upper end of the galvanized steel pipe.

[0016] Preferably, the galvanized steel pipes are provided in two groups, which are symmetrically arranged at both ends of the oil storage tank; multiple 1% mortar slopes are provided in the oil storage tank, and the end of the oil storage tank away from the galvanized steel pipe is higher than the other end of the galvanized steel pipe; and the middle part of the oil storage tank is higher than the galvanized steel pipe; a high-pressure chamber and a low-pressure chamber are provided on the side of the box transformer away from the oil storage tank.

[0017] Preferably, the method for using the oil-water separation structure comprises the following steps:

[0018] S301: When water continues to flow into the oil pool and the water level rises to the height of the U-shaped pipe, the water column flows from the high water level side to the low water level side through the stainless steel pipe for drainage;

[0019] S302: When there is a certain amount of water in the oil pool or the oil is discharged from the oil tank into the water pool, the oil cannot be pressed out of the U-shaped tube due to its low density, so that only the oil remains in the oil storage pool.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The present invention discloses an outdoor oil-immersed box-type transformer oil storage method. Utilizing the communicating vessel principle, when water continuously enters the oil pool and the water level reaches the elevation of the steel pipe inlet, water columns appear on both sides of the stainless steel pipe, and the water begins to drain through the stainless steel pipe. This prevents excessive water from overflowing the oil pool and causing other problems. When there is a certain amount of water in the oil pool or the oil tank drains into the water pool, since the density of transformer oil is approximately 0.9 times that of water, when the oil-water level on the right side of the stainless steel pipe exceeds the height of the steel grille, the water column on the left side is pressed out. Ultimately, the remaining liquid is ensured to be transformer oil and its elevation is below the water outlet, achieving the effect of both storing transformer oil and draining excess water.

[0022] 2. The present invention discloses an outdoor oil-immersed box-type transformer oil storage method. By arranging pebbles and steel grilles, water can first pass through the pebble layer, and some impurities will be intercepted in the gaps between the pebbles. At the same time, the pebbles can also disperse the water more evenly, avoiding the impact of excessive local water flow on other components, and helping to initially achieve the natural stratification and separation of oil and water; the gaps in the steel grilles can filter out some larger particles of impurities, reducing the amount of debris entering the subsequent drainage system or oil-water separation device, and realizing the dual functions of sludge cleaning and oil-water separation.

[0023] 3. The present invention discloses an outdoor oil-immersed box transformer oil storage method, which elevates the box transformer by means of a column support and combines it with a sunken oil storage tank to prevent ground runoff from directly impacting the oil tank. This helps to avoid moisture, water accumulation, and debris that may be encountered when the bottom of the box transformer directly contacts the ground, thereby reducing the risk of corrosion to the bottom of the box transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the planar layout structure of the column cap in the present invention;

[0026] Figure 2 It is a three-dimensional diagram of the oil storage tank of the present invention;

[0027] Figure 3 It is a cross-sectional view of the front view of the oil storage tank in the present invention;

[0028] Figure 4 is a method flow chart of the oil storage method of the present invention;

[0029] Figure 5 is a method flow chart of a method for using the oil-water separation structure of the present invention;

[0030] In the figure: 1. Steel grille; 2. Pebbles; 3. Galvanized steel pipe; 4. Stainless steel pipe; 5. Controllable switch for steel pipe opening; 6. Steel pipe inlet; 7. Oil storage tank; 8. Steel wire mesh; 9. Column base; 10. Box transformer; 11. High-voltage room; 12. Low-voltage room. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] like Figures 1 to 4 As shown, an outdoor oil-immersed box-type transformer oil storage method according to an embodiment of the present invention comprises the following steps:

[0033] S1: Placement of the box transformer 10 and construction of the oil reservoir 7; Place the box transformer 10 on a column support 9 at a height of 1.5m from the ground; Then, install a sinking plate around the oil tank and heat sink of the box transformer 10 to form the oil reservoir 7 placed on the column support 9;

[0034] S2: Calculate the required volume of the oil storage tank 7 based on the maximum oil volume of the oil tank of the box transformer 10;

[0035] S3: Based on the volume of the oil storage tank 7, the internal structure of the oil storage tank 7 and the oil-water separation structure are set.

[0036] When the oil storage method provided by the present invention is used, the main body of the box transformer 10 is placed on the column base 9 at a height of about 1.5m from the ground. At the same time, a sinking plate is set around the oil tank and heat sink of the oil-immersed transformer to form an oil storage pool 7 placed on the column base 9 to avoid erosion due to the influence of the terrain. At the same time, a simple oil-water separation device is set; then, according to the maximum oil volume of the oil tank of the box transformer 10, the volume required to be accommodated by the oil storage pool 7 is calculated, and the initial oil storage height is set to 100mm, and then the plane range of the oil pool is determined, that is, Figure 1 In the middle grid filling range, a steel grating 1 with a support height of 150mm is placed on the bottom plate of the oil storage tank 7, and then 250mm pebbles 2 are laid on the steel grating 1. A galvanized steel pipe 3 is reserved on the bottom plate of the oil tank, and a simple oil-water separation mechanism of a stainless steel pipe 4 is installed. The height of the lower edge of the steel pipe inlet 6 needs to be consistent with the maximum oil storage height. A controllable switch 5 for the steel pipe opening is set at the bottom of the stainless steel pipe 4. It is usually in a closed state and is opened when silt needs to be cleaned to avoid long-term large-scale water accumulation in the oil tank and achieve the oil-water separation effect; a wire mesh 8 is set at the upper end of the galvanized steel pipe 3 to reduce the flow of debris into the pipe and prevent blockage.

[0037] like Figure 2 and Figure 3As shown, the material of the column base 9 is concrete or metal. The top of the column base 9 is provided with a box transformer 10 body and an oil storage tank 7. The box transformer 10 includes an oil tank and a heat sink. The outer sides of the oil tank and the heat sink are provided with a sinking plate; the sinking plate is used to protect the oil in the oil storage tank 7.

[0038] When the column support 9 provided by the present invention is in use, the column support 9 is made of a strong and durable material, such as concrete or a metal structure, to ensure that it has sufficient bearing capacity to support the weight of the box transformer 10. This elevated placement of the box transformer 10 helps to avoid the problems of moisture, water accumulation, and debris that may be encountered when the bottom of the box transformer 10 directly contacts the ground, reduces the risk of corrosion to the bottom of the box transformer 10, and also facilitates the maintenance and inspection of the equipment; by arranging a sinking plate around the oil tank and heat sink of the oil-immersed transformer, an oil storage tank 7 is formed on the platform, and sinking plates are arranged around the oil storage tank 7 as a fence to prevent the oil from flowing out of the oil storage tank 7, while protecting the oil in the oil storage tank 7 from external interference to a certain extent.

[0039] like Figure 2 and Figure 3 As shown, the height of the oil storage tank 7 is set to 100 mm, and the bottom of the oil storage tank 7 is matched with the main body of the box transformer 10.

[0040] When the oil storage tank 7 provided by the present invention is used, the initial oil storage height is set to 100mm, and then the plane range of the oil tank is determined, which is Figure 1 Medium grid fill range.

[0041] like Figure 3 As shown, the internal structure of the oil storage tank 7 includes a steel grille 1 and pebbles 2. The steel grille 1 is arranged on the bottom plate of the oil storage tank 7. The top of the steel grille 1 is paved with pebbles 2. The height of the steel grille 1 is set to 150 mm, and the thickness of the pebbles 2 is set to 250 mm.

[0042] When the steel grating 1 and pebbles 2 provided by the present invention are in use, a steel grating 1 with a height of 150 mm is placed on the bottom plate of the oil storage tank 7. On the one hand, it serves as a supporting base for other paving materials in the oil storage tank 7, ensuring that the pebbles 2 and other materials laid subsequently will not directly contact the bottom plate of the oil storage tank 7, which is conducive to drainage and prevents mud and sand from clogging the drainage channel of the bottom plate; on the other hand, the gaps in the steel grating 1 can filter out some larger particles of impurities, reduce the amount of debris entering the subsequent drainage system or oil-water separation device, and ensure the smooth operation of the entire system; 250 mm thick pebbles 2 are laid on the steel grating 1. The pebbles 2 should be made of materials with hard texture, smooth surface and uniform size to further filter and buffer the oil-water mixture entering the oil storage tank 7. When the oil-water mixture enters the oil storage tank 7, the water flow can first pass through the pebbles 2 layer, and some impurities will be intercepted in the gaps of the pebbles 2. At the same time, the pebbles 2 can also disperse the water flow more evenly, avoiding the impact of local water flow being too turbulent on other components, and helping to initially achieve the natural stratification and separation of oil and water, because the density of oil is smaller than that of water, it will gradually converge in the upper layer; the pebbles 2 layer and the steel grid 1 form a physical filtration barrier, and cooperate with the controllable switch 5 of the bottom steel pipe opening to achieve the dual functions of sludge cleaning and oil-water separation.

[0043] like Figure 3 As shown, the oil-water separation structure includes a stainless steel pipe 4, a steel pipe opening controllable switch 5 and a steel pipe inlet 6; the stainless steel pipe 4 is set to be U-shaped, and one end of the stainless steel pipe 4 is set at the bottom of the oil storage tank 7; the other end of the stainless steel pipe 4 is set above the oil storage tank 7 and is set as the steel pipe inlet 6, and the lower edge height of the steel pipe inlet 6 is flush with the maximum oil storage height of the oil storage tank 7; the steel pipe opening controllable switch 5 is set at the bottom of the stainless steel pipe 4, and the steel pipe opening controllable switch 5 is connected to an external control device.

[0044] When in use, the oil-water separation structure provided by the present invention utilizes the principle of communicating vessels and the different densities of transformer oil and water to achieve oil-water separation. In the first scenario, when water continues to flow into the oil pool and the water level reaches the elevation of the steel pipe inlet 6, both sides of the stainless steel pipe 4 are filled with water columns. Based on the principle of communicating vessels, water will begin to drain through the stainless steel pipe 4, thus preventing excessive water from overflowing the oil reservoir 7 and causing other problems. In the second scenario, when there is a certain amount of water in the oil reservoir 7 or the oil tank drains into the water pool, since the density of transformer oil is approximately 0.9 times that of water, when the oil-water level on the right side of the stainless steel pipe 4 exceeds the height of the steel grille 1, the water column on the left side will be squeezed out, ultimately ensuring that the remaining liquid is transformer oil and its elevation is below the water outlet, achieving the effect of both storing transformer oil and draining excess water.

[0045] like Figure 3As shown, the end of the stainless steel pipe 4 away from the steel pipe inlet 6 is connected to the galvanized steel pipe 3, and the galvanized steel pipe 3 is embedded in the bottom plate of the oil storage tank 7; a steel wire mesh 8 is provided at the upper end of the galvanized steel pipe 3.

[0046] When the galvanized steel pipe 3 provided by the present invention is in use, a galvanized steel pipe 3 is reserved on the bottom plate of the oil pool, which is to prepare for the subsequent installation of a simple oil-water separation device and the discharge of accumulated water. The galvanized steel pipe 3 has good corrosion resistance, can be used for a long time in an outdoor environment and ensure the smooth flow of the inside of the pipe; by arranging a wire mesh 8 at the upper end of the galvanized steel pipe 3, it is used to reduce the flow of debris into the pipe, prevent debris such as leaves and dust from entering the steel pipe with the water flow and causing blockage, and ensure the smooth operation of the entire drainage and oil-water separation system.

[0047] like Figure 1 As shown, there are two groups of galvanized steel pipes 3, which are symmetrically arranged at both ends of the oil storage tank 7; multiple 1% mortar slopes are provided in the oil storage tank 7, and the end of the oil storage tank 7 away from the galvanized steel pipes 3 is higher than the end of the galvanized steel pipes 3; and the middle part of the oil storage tank 7 is higher than the galvanized steel pipes 3; a high-pressure chamber 11 and a low-pressure chamber 12 are provided on the side of the box transformer 10 away from the oil storage tank 7.

[0048] When the 1% mortar slope provided by the present invention is used, a 1% slope is designed from the middle of the oil draining pool to the buried pipe, ensuring that any leaked oil can flow smoothly into the oil draining pool.

[0049] like Figure 5 As shown, the method for using the oil-water separation structure includes the following steps:

[0050] S301: When water continues to flow into the oil pool and the water level rises to the height of the U-shaped tube, the water column flows from the side with high water level to the side with low water level through the stainless steel tube 4 for drainage;

[0051] S302: When there is a certain amount of water in the oil pool or the oil is discharged from the oil tank into the water pool, the oil cannot be pressed out of the U-shaped tube due to its low density, so that only the oil remains in the oil storage pool 7.

[0052] The method of using the oil-water separation structure provided by the present invention includes the following two situations:

[0053] When water continues to flow into the oil pool, the water level will gradually rise. When it reaches the elevation of the steel pipe inlet 6, there will be water columns on both sides of the stainless steel pipe 4. According to the communicating vessel principle, under the pressure of the water columns on both sides, the water begins to be discharged through the stainless steel pipe 4. This is based on the principle that when the same liquid in the communicating vessel is not flowing, the liquid levels always remain flat. When the water level on one side rises and the water level on the other side is lower, a water level difference will be generated, thereby prompting water to flow from the side with high water level to the side with low water level through the stainless steel pipe 4, thereby achieving drainage and avoiding excessive water accumulation from causing adverse effects on the oil storage tank 7 and the box transformer 10.

[0054] When there is a certain amount of water in the oil pool or the oil tank is drained into the water pool, since the density of transformer oil is about 0.9 times the density of water, according to the principle of communicating vessels, when the oil and water height on the right side of the stainless steel pipe 4 exceeds the height of the steel grid 1, the water pressure is greater than the pressure of the transformer oil, which will press out the water column on the left side, and ultimately ensure that the remaining liquid is transformer oil and the elevation is below the water outlet. In this way, the purpose of storing transformer oil is achieved, and at the same time, the excess accumulated water is discharged from the oil pool, ensuring that there is always a certain amount of qualified transformer oil in the oil storage pool 7 to meet the requirements of normal operation of the box transformer 10.

[0055] Working principle: The main body of the box transformer 10 is placed on the column base 9 at a height of about 1.5m from the ground. At the same time, a sinking plate is set around the oil tank and heat sink of the oil-immersed transformer to form an oil storage pool 7 placed on the column base 9 to avoid being washed away by the terrain. At the same time, a simple oil-water separation device is set; then, according to the maximum oil volume of the oil tank of the box transformer 10, the volume required to be accommodated by the oil storage pool 7 is calculated, and the initial oil storage height is set to 100mm, and then the plane range of the oil pool is determined, that is, Figure 1 In the middle grid filling range, a steel grille 1 with a support height of 150mm is placed on the bottom plate of the oil storage tank 7, and then 250mm pebbles 2 are laid on the steel grille 1. A galvanized steel pipe 3 is reserved on the bottom plate of the oil tank, and a simple oil-water separation mechanism of a stainless steel pipe 4 is installed. The lower edge height of the steel pipe inlet 6 needs to be consistent with the maximum oil storage height. A steel pipe opening controllable switch 5 is set at the bottom of the stainless steel pipe 4. It is usually in a closed state and is opened when silt needs to be cleaned to avoid long-term large-scale water accumulation in the oil tank and achieve the oil-water separation effect; a steel wire mesh 8 is set at the upper end of the galvanized steel pipe 3 to reduce the flow of debris into the pipe and prevent blockage;

[0056] A steel grating 1 with a height of 150 mm is placed on the bottom plate of the oil storage tank 7. On the one hand, it serves as a supporting base for other paving materials in the oil storage tank 7, ensuring that materials such as pebbles 2 laid subsequently will not directly contact the bottom plate of the oil storage tank 7, which is conducive to drainage and prevents mud and sand from clogging the drainage channel of the bottom plate; on the other hand, the gaps in the steel grating 1 can filter out some larger particles of impurities, reduce the amount of debris entering the subsequent drainage system or oil-water separation device, and ensure the smooth operation of the entire system; 250 mm thick pebbles 2 are laid on the steel grating 1. The pebbles 2 should be made of hard, smooth and uniform materials to further filter and buffer the oil-water mixture entering the oil storage tank 7. When the oil-water mixture enters the oil storage tank 7, the water flow can first pass through the pebbles 2 layer, and some impurities will be intercepted in the gaps of the pebbles 2. At the same time, the pebbles 2 can also make the water flow more evenly dispersed, preventing the local water flow from being too turbulent and causing impact on other components, and help to initially achieve the natural stratification and separation of oil and water. Because the density of oil is smaller than that of water, it will gradually gather in the upper layer; the pebbles 2 layer and the steel grid 1 form a physical filtration barrier, and cooperate with the controllable switch 5 of the bottom steel pipe opening to achieve the dual functions of sludge cleaning and oil-water separation;

[0057] When water continues to flow into the oil pool, the water level will gradually rise. When it reaches the elevation of the steel pipe inlet 6, there will be water columns on both sides of the stainless steel pipe 4. According to the communicating vessel principle, under the pressure of the water columns on both sides, the water begins to be discharged through the stainless steel pipe 4. This is based on the principle that when the same liquid in the communicating vessel is not flowing, the liquid levels always remain flat. When the water level on one side rises and the water level on the other side is lower, a water level difference will be generated, thereby prompting water to flow from the side with high water level to the side with low water level through the stainless steel pipe 4, thereby achieving drainage and avoiding excessive water accumulation from causing adverse effects on the oil storage tank 7 and the box transformer 10.

[0058] When there is a certain amount of water in the oil pool or the oil tank is drained into the water pool, since the density of transformer oil is about 0.9 times the density of water, according to the principle of communicating vessels, when the oil and water height on the right side of the stainless steel pipe 4 exceeds the height of the steel grid 1, the water pressure is greater than the pressure of the transformer oil, which will press out the water column on the left side, and ultimately ensure that the remaining liquid is transformer oil and the elevation is below the water outlet. In this way, the purpose of storing transformer oil is achieved, and at the same time, the excess accumulated water is discharged from the oil pool, ensuring that there is always a certain amount of qualified transformer oil in the oil storage pool 7 to meet the requirements of normal operation of the box transformer 10.

[0059] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An outdoor oil-immersed box-type transformer oil storage method, characterized by: The oil storage method comprises the following steps: S1: Placement of the box transformer (10) and construction of the oil storage tank (7); Place the box transformer (10) on a column support (9) at a height of 1.5m from the ground; Then, set a sinking plate around the oil tank and heat sink of the box transformer (10) to form an oil storage tank (7) placed on the column support (9); S2: Calculate the volume required for the oil storage tank (7) based on the maximum oil volume of the oil tank of the box transformer (10); S3: Based on the volume of the oil storage tank (7), the internal structure of the oil storage tank (7) and the oil-water separation structure are set.

2. The oil storage method for an outdoor oil-immersed box-type transformer according to claim 1, characterized in that: The column support (9) is made of one of concrete and metal. The top of the column support (9) is provided with a box transformer (10) body and an oil storage tank (7). The box transformer (10) includes an oil tank and a heat sink. The outer sides of the oil tank and the heat sink are both provided with a sinking plate. The sinking plate is used to protect the oil in the oil storage tank (7).

3. The oil storage method for an outdoor oil-immersed box-type transformer according to claim 1, characterized in that: The height of the oil storage tank (7) is set to 100 mm, and the bottom of the oil storage tank (7) is arranged in coordination with the main body of the box transformer (10).

4. The oil storage method for an outdoor oil-immersed box-type transformer according to claim 1, characterized in that: The internal structure of the oil storage tank (7) comprises a steel grid (1) and pebbles (2), wherein the steel grid (1) is arranged on the bottom plate of the oil storage tank (7), the top of the steel grid (1) is paved with pebbles (2), the height of the steel grid (1) is set to 150 mm, and the thickness of the pebbles (2) is set to 250 mm.

5. The oil storage method for an outdoor oil-immersed box-type transformer according to claim 1, characterized in that: The oil-water separation structure comprises a stainless steel pipe (4), a steel pipe opening controllable switch (5) and a steel pipe inlet (6); the stainless steel pipe (4) is set to be U-shaped, and one end of the stainless steel pipe (4) is arranged at the bottom of the oil storage tank (7); the other end of the stainless steel pipe (4) is arranged above the oil storage tank (7) and is set as the steel pipe inlet (6), and the lower edge height of the steel pipe inlet (6) is flush with the maximum oil storage height of the oil storage tank (7); the steel pipe opening controllable switch (5) is set at the bottom of the stainless steel pipe (4), and the steel pipe opening controllable switch (5) is connected to an external control device.

6. The oil storage method for an outdoor oil-immersed box-type transformer according to claim 5, characterized in that: The end of the stainless steel pipe (4) away from the steel pipe inlet (6) is connected to a galvanized steel pipe (3), and the galvanized steel pipe (3) is embedded in the bottom plate of the oil storage tank (7); a steel wire mesh (8) is provided at the upper end of the galvanized steel pipe (3).

7. The oil storage method for an outdoor oil-immersed box-type transformer according to claim 6, characterized in that: The galvanized steel pipes (3) are provided in two groups and are symmetrically arranged at both ends of the oil storage tank (7); a plurality of 1% mortar slopes are provided in the oil storage tank (7); the end of the oil storage tank (7) away from the galvanized steel pipes (3) is higher than the end of the galvanized steel pipes (3); and the middle of the oil storage tank (7) is higher than the galvanized steel pipes (3); a high-pressure chamber (11) and a low-pressure chamber (12) are provided on the side of the box transformer (10) away from the oil storage tank (7).

8. The oil storage method for an outdoor oil-immersed box-type transformer according to claim 1, characterized in that: The method for using the oil-water separation structure comprises the following steps: S301: When water continues to flow into the oil pool and the water level rises to the height of the U-shaped pipe, the water column flows from the side with high water level to the side with low water level through the stainless steel pipe (4) for drainage; S302: When there is a certain amount of water in the oil pool or the oil tank is drained into the water pool, the oil cannot be pressed out of the U-shaped tube due to its low density, so that only the oil remains in the oil storage pool (7).

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