Oil-immersed fan box transformer foundation combined with oil storage pit and accident oil pool

Abstract

The utility model discloses an oil immersion type fan box transformer foundation combined with oil storage pit and accident oil pool, including box transformer foundation main part, still include oil storage pit and accident oil pool, and box transformer foundation main part with oil storage pit, oil storage pit and accident oil pool are mutually contiguous, be equipped with siphon drain pipe in accident oil pool. This oil immersion type fan box transformer foundation combines and is integrated design with oil immersion type fan box transformer foundation to oil storage pit, accident oil pool, and the area of land is smaller, through the siphon drain pipe of setting in accident oil pool can export water accident oil pool, and transformer oil can be properly kept in accident oil pool, effectively avoid the environmental pollution of transformer oil to surrounding area, and the foundation structure is more compact, reasonable, has reduced the engineering quantity, also is convenient for operation maintenance simultaneously, can effectively save the cost of engineering construction investment and operation maintenance.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil-immersed wind turbine facilities, and in particular relates to an oil-immersed wind turbine transformer foundation that combines an oil storage pit and an emergency oil pool. Background Technology

[0002] According to Article 5.1.2 of the "Code for Electrical Design of Wind Farm Engineering" (NB / T 31026-2022): "The connection method between wind turbine generator sets and the unit substation should preferably adopt a unit wiring method of one generator set and one substation". Also, according to the "Fire Protection Design Standard for Thermal Power Plants and Substations" (GB... Article 6.7.8 of 50229-2019 stipulates that "Outdoor electrical equipment with a single unit oil capacity of 1000kg or more shall be equipped with oil storage or oil containment facilities. The volume of such facilities should be designed according to 20% of the equipment's oil capacity and be able to discharge emergency oil to a total emergency oil storage tank. The capacity of the total emergency oil storage tank shall be determined according to the equipment with the largest oil capacity connected to it, and an oil-water separation device shall be installed. When the above requirements cannot be met, an oil storage facility capable of accommodating the entire oil capacity of the corresponding electrical equipment shall be installed, along with an oil-water separation device. The oil storage or oil containment facilities shall be 1m larger than the outer contour of the equipment on each side." Furthermore, with the gradual increase in the single-unit capacity of wind turbines, the capacity of oil-immersed transformer substations (hereinafter referred to as transformer substations) in wind farms has also increased accordingly. The floor area, oil capacity, and volume of transformer substations have also increased. The oil capacity of a single transformer substation has far exceeded 1000kg. Therefore, all transformer substations should be equipped with oil storage or oil containment facilities and emergency oil tanks. When a transformer substation experiences an oil spill, a large amount of transformer oil will spray out from the transformer within a short period of time, leaking into the surrounding area. Without specialized protective measures, this can easily lead to a large fire, and the leaked oil will pollute the environment around the substation. Therefore, based on comprehensive considerations of design specifications, environmental protection, and fire safety, the foundation of the transformer substation must be equipped with an oil storage pit and an emergency oil pool.

[0003] In conventional designs, the transformer substation uses a layout where the foundation and emergency oil tank are independent. Therefore, additional land is needed near the substation foundation to install a separate emergency oil tank. This requires additional land for the oil tank, increasing project investment and construction time. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an oil-immersed fan box transformer foundation that combines an oil storage pit and an emergency oil pool in a compact, environmentally friendly, and cost-effective manner.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] The oil-immersed wind turbine transformer foundation, which combines an oil storage pit and an emergency oil pool, includes the transformer foundation body, an oil storage pit, and an emergency oil pool. The transformer foundation body and the oil storage pit, as well as the oil storage pit and the emergency oil pool, are connected to each other. The emergency oil pool is equipped with a siphon drainage pipe.

[0007] The oil storage pit is connected to the emergency oil pool, and the depth of the oil storage pit is less than that of the emergency oil pool.

[0008] The oil storage pit is located around the oil-bearing equipment of the transformer substation, which is part of the transformer substation foundation.

[0009] The oil storage pit consists of a 150mm thick C30 concrete base slab, a crushed stone cushion layer, and a 250mm thick cobblestone layer. A 300mm high oil retaining wall is set around the oil storage pit, and the oil retaining wall is made of C30 plain concrete.

[0010] The accident oil pool is located on one side of the oil storage pit.

[0011] A steel grating was installed above the oil spill site.

[0012] The siphon drain pipe is a DN200 drain pipe with a right-angle bend. A DN350 / 200 reducer suction port is installed at the bottom of the drain pipe. The suction port is more than 400mm away from the bottom of the emergency oil tank.

[0013] The oil tank in the accident consisted of a C15 plain concrete base layer and C30 concrete poured for the tank walls.

[0014] The main body of the transformer substation foundation is made of C30 concrete, with C15 plain concrete used as the subbase.

[0015] To address the existing problems with current oil-immersed wind turbine transformer substation foundations, the inventors designed an oil-immersed wind turbine transformer substation foundation that combines an oil storage pit and an emergency oil pool. The foundation includes a main substation body, an oil storage pit, and an emergency oil pool, with the main substation body and the oil storage pit, and the oil storage pit and emergency oil pool, being adjacent to each other. The emergency oil pool is equipped with a siphon drainage pipe. This oil-immersed wind turbine transformer substation foundation has the following outstanding advantages:

[0016] 1. Small footprint

[0017] Compared with setting up an emergency oil tank separately on the wind turbine platform, this utility model combines the oil storage pit and the emergency oil tank with the oil-immersed wind turbine transformer foundation. It eliminates the need to occupy a separate area for the emergency oil tank, thus requiring less land. This is beneficial for the approval of land use for wind power projects and facilitates project progress.

[0018] 2. Protect the environment

[0019] The oil discharged from the storage pit to the emergency oil pool is often a mixture of oil and water. Because water is denser than transformer oil, after sedimentation, water will be at the bottom and transformer oil at the top. The water can be discharged out of the emergency oil pool through the siphon drainage pipe installed in the emergency oil pool, while the transformer oil can be properly stored in the emergency oil pool and will not be discharged into the surrounding environment, effectively avoiding environmental pollution caused by transformer oil to the surrounding area.

[0020] 3. Save on investment

[0021] The structure of the oil-immersed wind turbine transformer substation foundation of this utility model is more compact and reasonable, reducing the overall size and floor area of ​​the transformer substation foundation, which in turn reduces the amount of excavation and concrete pouring work in civil construction. At the same time, it is also convenient for operation and maintenance, which can effectively save on project construction investment and operation and maintenance costs. Attached Figure Description

[0022] Figure 1 This is a top view (see diagram) showing the usage status and structure of the oil-immersed fan box transformer foundation that combines an oil storage pit and an emergency oil pool.

[0023] Figure 2 yes Figure 1 A schematic diagram of the usage status and structure of an oil-immersed fan transformer foundation along the BB direction, which combines an oil storage pit and an emergency oil pool.

[0024] Figure 3 yes Figure 1 A schematic diagram of the usage status and structure of an oil-immersed wind turbine transformer foundation that combines an oil storage pit and an emergency oil pool, along the AA direction.

[0025] In the diagram: 1. Substation foundation, 2. Oil storage pit, 3. Emergency oil pool, 4. Heat sink (for oil-bearing equipment in the substation), 5. Oil retaining sill, 6. Steel grating, 7. Siphon drainage pipe. Detailed Implementation

[0026] like Figures 1 to 3 As shown, the oil-immersed wind turbine transformer foundation of this utility model, which combines an oil storage pit and an emergency oil pool, includes a transformer foundation body 1, an oil storage pit 2, and an emergency oil pool 3. The transformer foundation body and the oil storage pit, as well as the oil storage pit and the emergency oil pool, are adjacent to each other, achieving a combination of the transformer foundation body, the oil storage pit, and the emergency oil pool. Gaps between the three components must be properly treated.

[0027] The main body of the transformer substation foundation is made of C30 concrete, with C15 plain concrete as the cushion layer. The main body of the transformer substation foundation contains pre-set foundation steel bars and embedded parts.

[0028] The oil storage pit is located around the heat sink (oil-bearing equipment) 4 of the transformer substation foundation. The oil storage pit includes a 150mm thick C30 concrete base slab, a crushed stone cushion layer, and a 220mm thick cobblestone layer. An oil retaining wall 5 with a height of 300mm is set around the oil storage pit. The oil retaining wall is made of C30 plain concrete.

[0029] The emergency oil pool is located on one side of the oil storage pit and is connected to the oil storage pit, with a depth greater than that of the oil storage pit. The emergency oil pool consists of a C15 plain concrete base layer and C30 concrete walls. A steel grating 6 is installed above the emergency oil pool, and a siphon drainage pipe 7 is installed inside the emergency oil pool. The siphon drainage pipe is a DN200 drainage pipe with a right-angle elbow, and a DN350 / 200 reducer suction port is installed at the bottom of the drainage pipe. The distance between the suction port and the bottom of the emergency oil pool is greater than 400mm. When an oil-water mixture flows into the accident oil pool, the transformer oil will float on top of the water because water is denser than transformer oil. When the liquid level in the accident oil pool is higher than the elevation of the siphon drain outlet, the water below the siphon drain inlet in the accident oil pool will be discharged from the accident oil pool and flow out of the slope under the action of transformer oil and atmospheric pressure until the liquid level in the accident oil pool is lower than the elevation of the siphon drain outlet. This achieves the goal of storing the transformer oil in the area between the elevation of the siphon drain inlet and the siphon drain outlet in the accident oil pool, preventing the oil-water mixture from leaking into the surrounding area.

[0030] This foundation not only meets all the requirements of relevant specifications, but also has a compact structure and reasonable layout. It does not require additional space for the accident oil tank and is easy to construct, maintain and repair. At the same time, it can effectively prevent transformer accident oil from leaking into the surrounding area of ​​the transformer substation, thereby avoiding environmental pollution.

Claims

1. An oil-immersed wind turbine transformer foundation combining an oil storage pit and an emergency oil pool, comprising the transformer foundation body, characterized in that... It also includes an oil storage pit and an emergency oil pool, and the main body of the transformer substation foundation is adjacent to the oil storage pit and the oil storage pit is adjacent to the emergency oil pool; the emergency oil pool is equipped with a siphon drainage pipe.

2. The oil-immersed fan box transformer foundation according to claim 1, characterized in that: The oil storage pit is connected to the emergency oil pool, which facilitates the flow of emergency oil from the oil storage pit to the emergency oil pool.

3. The oil-immersed fan box transformer foundation according to claim 1, characterized in that: The oil storage pit is located around the oil-bearing equipment of the transformer substation foundation.

4. The oil-immersed fan box transformer foundation according to claim 3, characterized in that: The oil storage pit includes a 150mm thick C30 concrete base slab, a crushed stone cushion layer, and a 250mm thick cobblestone layer. An oil retaining wall with a height of 300mm is set around the oil storage pit, and the oil retaining wall is cast with C30 plain concrete.

5. The oil-immersed fan box transformer foundation according to claim 1, characterized in that: The accident oil pool is located on one side of the oil storage pit.

6. The oil-immersed fan box transformer foundation according to claim 5, characterized in that: A steel grating was installed above the accident oil pool.

7. The oil-immersed fan box transformer foundation according to claim 6, characterized in that: The siphon drain pipe is a DN200 drain pipe with a right-angle bend. A DN350 / 200 reducer is installed at the bottom of the drain pipe, and the distance between the drain pipe and the bottom of the emergency oil tank is greater than 400mm.

8. The oil-immersed fan box transformer foundation according to claim 7, characterized in that: The accident oil tank consisted of a C15 plain concrete base layer and C30 concrete poured for the tank walls.

9. The oil-immersed fan box transformer foundation according to claim 1, characterized in that: The main body of the transformer substation foundation is made of C30 concrete, with C15 plain concrete used as the subbase.

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