Fluorinated liquid insulating transformer

Abstract

The utility model discloses a fluorination liquid insulation transformer which comprises a transformer body, an iron core and a winding which are arranged in a box body, the transformer body, the iron core and the winding are all soaked in fluorination liquid, and a pump machine is arranged in the box body and connected through a pipeline to enable the fluorination liquid to circularly flow in the box body. A liquid pillow is arranged at the top of the box body, nitrogen is filled into the liquid pillow, an air inlet valve, an air outlet valve and a liquid inlet valve are arranged at the top of the liquid pillow, the air inlet valve and the air outlet valve are used for filling and releasing nitrogen, and the liquid inlet valve is used for supplementing fluorinated liquid; radiators are symmetrically mounted on two sides outside the box body; a high-voltage bushing and a low-voltage bushing which are symmetrical at the top of the box body are used for connecting the high-voltage side and the low-voltage side of the transformer body with an external circuit; according to the transformer using the fluorinated liquid as the insulating medium, fire hazards are eliminated, the safety performance of the transformer is greatly improved, meanwhile, the fluorinated liquid is long in service life, good in stability and free of frequent replacement, and the overall maintenance cost of the transformer is reduced.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a fluorinated liquid insulated transformer. Background Technology

[0002] Traditional transformers typically use mineral insulating oil as the insulating medium. However, transformers using mineral insulating oil pose significant fire safety hazards, requiring fire-fighting facilities such as foam sprinkler systems, water sprinkler systems, and emergency oil storage tanks. This not only increases construction costs and maintenance difficulty but also occupies considerable space. Especially in converter stations, particularly offshore converter stations, due to their unique geographical location and operating environment, fire rescue is extremely difficult, resulting in incalculable economic losses and social impact.

[0003] In recent years, during transformer operation, the heat generated by losses in the windings and core must be dissipated promptly to prevent overheating and insulation damage. For small-capacity transformers, the ratio of external surface area to transformer volume is relatively large, allowing for self-cooling through radiation and natural convection to dissipate heat. However, with continuous societal development, the demand for electricity is increasing, especially during peak summer and winter seasons. Transformers often operate under overload, generating significant heat. Simple air cooling, due to the low specific heat capacity of gases, is insufficient to dissipate the large amount of heat generated by the transformer in time, leading to transformer shutdown, damage, or even explosions. This not only severely impacts people's lives and production but also damages electrical equipment, causing losses to the nation. Furthermore, transformer losses are proportional to their volume; therefore, as transformer capacity increases, its volume and losses increase by the cube of the core size, while its external surface area increases only by the square of the size.

[0004] For large-capacity transformer cores and windings, the self-cooling method described above is also difficult to meet their cooling requirements. Therefore, a fluorinated liquid insulated transformer is proposed to solve the above problems. Utility Model Content

[0005] In order to solve the above-mentioned problems existing in the prior art, this utility model provides a fluorinated liquid insulated transformer.

[0006] The technical solution of this utility model is as follows:

[0007] A fluorinated liquid-insulated transformer includes a housing and a transformer body. The housing contains the transformer body, core, and windings, all of which are immersed in fluorinated liquid. A pump is installed inside the housing and connected to a pipeline to circulate the fluorinated liquid within the housing. A liquid conservator is installed on the top of the housing and filled with nitrogen gas. The top of the conservator is equipped with an inlet valve, an outlet valve, and a liquid inlet valve. The inlet and outlet valves are used to fill and release nitrogen gas, while the liquid inlet valve is used to replenish the fluorinated liquid. Radiators are symmetrically installed on both sides of the exterior of the housing. High-voltage bushings and low-voltage bushings are symmetrically mounted on the top of the housing for connecting the high and low voltage sides of the transformer body to external circuits.

[0008] Preferably, the housing is made of one-piece steel plate to prevent leakage of fluorinated liquid.

[0009] Preferably, the core is made of several silicon steel sheets with high magnetic permeability stacked together, and the silicon steel sheets are coated with an insulating coating.

[0010] Preferably, the winding includes a high-voltage winding and a low-voltage winding, the windings are wound on the side posts of the iron core and are arranged concentrically; the outer surface of the windings is covered with a polyimide film.

[0011] Preferably, the heat sink adopts a finned structure.

[0012] Preferably, a pressure sensor is also provided on the top of the liquid conservator to monitor the internal pressure of the transformer body.

[0013] This invention has the following advantages: The transformer using fluorinated liquid as the insulating medium eliminates fire hazards, eliminates the need for complex fire extinguishing facilities, and greatly improves the safety performance of the transformer. It is especially suitable for places with extremely high fire safety requirements, such as offshore converter stations. At the same time, the fluorinated liquid has a long service life and good stability, eliminating the need for frequent replacement and reducing the overall maintenance cost of the transformer. The high heat dissipation performance of the fluorinated liquid allows the transformer to more effectively dissipate the heat generated during operation, improving the operating efficiency and reliability of the transformer and extending its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] The reference numerals in the figure are as follows:

[0016] 1. Iron core; 2. Winding; 3. Fluoride liquid; 4. Housing; 5. Low-pressure bushing; 6. High-pressure bushing; 7. Radiator; 8. Liquid pillow; 9. Inlet valve; 10. Outlet valve; 11. Liquid level observation window; 12. Nitrogen; 13. Pressure sensor; 14. Liquid inlet valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] See Figure 1 A fluorinated liquid-insulated transformer includes a housing 4 and a transformer body. The housing 4 contains the transformer body, core 1, and winding 2, all of which are immersed in fluorinated liquid 3. A pump is installed inside the housing 4 and connected to a pipeline to circulate the fluorinated liquid 3 within the housing 4. A liquid pillow 8 is installed on the top of the housing 4, and nitrogen gas 12 is filled inside the liquid pillow 8. An air inlet valve 9, an air outlet valve 10, and a liquid inlet valve 14 are installed on the top of the liquid pillow 8. The air inlet valve 9 and the air outlet valve 10 are used to fill and release nitrogen gas 12, and the liquid inlet valve is used to replenish the fluorinated liquid 3. Radiators 7 are symmetrically installed on both sides of the exterior of the housing 4. High-voltage bushings 6 and low-voltage bushings 5 ​​are symmetrically installed on the top of the housing 4 for connecting the high and low voltage sides of the transformer body to the external circuit.

[0019] Furthermore, the housing 4 is constructed from a single piece of steel plate to prevent leakage of the fluorinated liquid 3.

[0020] Furthermore, the core 1 is made of several silicon steel sheets with high magnetic permeability stacked together, and the silicon steel sheets are coated with an insulating coating.

[0021] Furthermore, the winding 2 includes a high-voltage winding and a low-voltage winding. The winding 2 is wound on the side posts of the core 1 and is arranged concentrically. The outer surface of the winding 2 is covered with a polyimide film.

[0022] Furthermore, the radiator 7 adopts a finned structure.

[0023] Furthermore, a pressure sensor 13 is also provided on the top of the liquid conservator 8 to monitor the internal pressure of the transformer body.

[0024] The working principle of this utility model:

[0025] In this invention, the housing 4 houses the transformer body, core 1, and winding 2, all of which are immersed in fluorinated liquid 3. The insulating properties of the fluorinated liquid 3 provide electrical insulation and prevent discharge. The housing 4 is constructed from a single piece of steel plate to prevent leakage of the fluorinated liquid 3. A pump is installed inside the housing 4 and connected via pipes to circulate the fluorinated liquid 3 within the housing 4. The core 1 is constructed from several stacked silicon steel sheets with high magnetic permeability, and an insulating coating is applied between the silicon steel sheets to ensure efficient magnetic circuit conduction. The winding 2 includes a high-voltage winding and a low-voltage winding. The winding 2 is wound on the side posts of the core 1 and arranged concentrically. The outer surface of the winding 2 is covered with a polyimide film to reduce leakage flux and improve electromagnetic conversion efficiency. A liquid pillow 8 is set on the top of the tank 4, and the liquid pillow 8 is filled with nitrogen gas 12. Because the boiling point of the fluorinated liquid 12 is low, the vaporization of the fluorinated liquid 12 will reduce the insulation performance of the transformer body. Therefore, nitrogen gas 12 needs to be filled into the liquid pillow 8 on the top of the tank 4 to increase the gas pressure and raise the boiling point of the fluorinated liquid 12. The fluorinated liquid 12 is used as the core insulating medium, which has high electrical insulation performance, low viscosity, high heat dissipation performance and non-flammability.

[0026] The top of the liquid conservator 8 is equipped with an inlet valve 9, an outlet valve 10, and a liquid inlet valve 14. Inlet valves 9 and 10 are used to charge and release nitrogen gas 12, while the liquid inlet valve 14 is used to replenish fluorinated liquid 3. Because fluorinated liquid 3 has a low boiling point, and the bubbles generated during its vaporization can affect insulation performance, potentially causing winding breakdown or core 1 discharge to ground, thus impacting transformer safety, it is necessary to increase the gas pressure. Therefore, injecting nitrogen gas 12 is used to raise the boiling point of fluorinated liquid 3, hence nitrogen is injected at the top of the liquid conservator 8. The nitrogen gas 12 pressure must not be lower than 0.5 MPa when the fluorinated liquid 3 level is at its lowest. Inlet valve 9 is used to replenish nitrogen gas 12, and outlet valve 10 will open when the gas pressure exceeds the safe pressure to ensure transformer safety. A pressure sensor 13 is also installed on the top of the liquid conservator 8 to monitor the internal pressure of the transformer in real time; radiators 7 are symmetrically installed on both sides of the outer side of the enclosure 4, and high-voltage bushings 6 and low-voltage bushings 5 ​​are symmetrically installed on the top of the enclosure 4 for connecting the high and low voltage sides of the transformer body to the external circuit.

[0027] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fluorinated liquid-insulated transformer, comprising a housing (4) and a transformer body, characterized in that: The housing (4) contains a transformer body, a core (1), and a winding (2), and the transformer body, core (1), and winding (2) are all immersed in fluorinated liquid (3). The housing (4) contains a pump and is connected to a pipeline to circulate the fluorinated liquid (3) within the housing (4). A liquid pillow (8) is installed on the top of the housing (4), and nitrogen gas (12) is filled inside the liquid pillow (8). An air inlet valve (9), an air outlet valve (10), and a liquid inlet valve (14) are installed on the top of the liquid pillow (8). The air inlet valve (9) and the air outlet valve (10) are used to fill and release nitrogen gas (12), and the liquid inlet valve (14) is used to replenish the fluorinated liquid (3). Radiators (7) are symmetrically installed on both sides of the exterior of the housing (4). High-voltage bushings (6) and low-voltage bushings (5) are symmetrically installed on the top of the housing (4) for connecting the high and low voltage sides of the transformer body to the external circuit.

2. The fluorinated liquid insulated transformer according to claim 1, characterized in that: The housing (4) is made of steel plate in one piece to prevent leakage of fluorinated liquid (3).

3. A fluorinated liquid insulated transformer according to claim 1, characterized in that: The core (1) is made of several silicon steel sheets with high magnetic permeability stacked together, and the silicon steel sheets are coated with an insulating coating.

4. A fluorinated liquid insulated transformer according to claim 1, characterized in that: The winding (2) includes a high-voltage winding and a low-voltage winding. The winding (2) is wound on the side posts of the iron core (1) and is arranged concentrically. The outer surface of the winding (2) is covered with a polyimide film.

5. A fluorinated liquid insulated transformer according to claim 1, characterized in that: The radiator (7) adopts a fin structure.

6. A fluorinated liquid insulated transformer according to claim 1, characterized in that: The top of the liquid conservator (8) is also equipped with a pressure sensor (13) for monitoring the internal pressure of the transformer body.

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