Accident oil discharge system for transformer of hydropower station

Abstract

The utility model relates to an accident oil discharge system for a hydropower station transformer. The method is suitable for the technical field of hydropower station accident oil drainage. The technical problem to be solved by the application is to provide the accident oil discharge system for the transformer of the hydropower station. According to the technical scheme, the detention pond comprises a detention pond structure arranged at the bottom of the transformer and used for gathering an oil-water mixture; the accident oil pool structure is arranged below the detention pool structure and comprises a standing pool and a water outlet pool, the standing pool is communicated with the water outlet pool through a communicating pipe, the standing pool is used for standing the oil-water mixture and layering oil and water, and the communicating pipe can send water in a water layer after oil and water layering into the water outlet pool; the water outlet tank can discharge internal water; the discharge pipe assembly is arranged between the detention pond structure and the standing pond, and the discharge pipe assembly is used for conveying the oil-water mixture of the detention pond structure into the standing pond.

Description

Technical Field

[0001] The utility model relates to the technical field of accidental oil discharge in hydropower stations, in particular to an accidental oil discharge system for transformers in hydropower stations. Background Art

[0002] The main transformer of a hydropower station with a ground plant is generally arranged on the tailwater platform and is an outdoor oil-filled electrical device. The Technical Specifications for the Design of High-voltage Distribution Devices stipulates that "when the oil volume of a single outdoor electrical device is more than 1,000 kg, oil storage facilities or oil retaining facilities should be installed. When oil storage or oil retaining facilities that can accommodate 20% of the oil volume are installed, facilities for draining the oil to a safe place should be installed, and pollution hazards should not be caused. When the above requirements cannot be met, oil storage or oil retaining facilities that can accommodate 100% of the oil volume should be installed."

[0003] According to the requirements of the regulations, most hydropower stations are currently required to set up emergency oil drainage systems to meet the requirements of timely storage of oil and water in the event of a fire in the main transformer. Among them, for transformers installed outdoors, since they are in the open air, they are easily affected by rain and leakage. Therefore, in addition to meeting the requirements of timely storage of oil and water in the event of a fire, the emergency oil drainage system also needs to consider other functional requirements such as the removal of rainwater and leakage water after collection. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the above existing problems, an emergency oil discharge system for a transformer of a hydropower station is provided.

[0005] The technical solution adopted by the utility model is: an accident oil discharge system for a transformer in a hydropower station, characterized in that it comprises:

[0006] A retention tank structure is provided at the bottom of the transformer, and the retention tank structure is used to collect the oil-water mixture;

[0007] The accident oil pool structure is arranged below the retention pool structure, and includes a static pool and a water outlet pool. The static pool and the water outlet pool are connected via a connecting pipe. The static pool is used to statically store the oil-water mixture and separate the oil and water into layers. The connecting pipe can send the water in the water layer after the oil and water are separated into layers into the water outlet pool, and the water outlet pool can discharge the internal water.

[0008] A discharge pipe assembly is disposed between the retention tank structure and the static tank, and the discharge pipe assembly is used to transport the oil-water mixture of the retention tank structure to the static tank.

[0009] Through the above-mentioned technical means, the retention tank structure is used to gather the oil-water mixture formed by mixed rainwater or leakage water to prevent accidental oil spills, and the discharge pipe assembly is used to discharge the oil-water mixture in the retention tank structure into the static tank. The oil-water mixture forms oil-water stratification after standing in the static tank. The water in the stratified water layer in the static tank is sent to the outlet tank with the help of a connecting pipe, and the water is discharged through the outlet tank, and the environmental protection of the discharged water is achieved through the double tank structure.

[0010] In some embodiments, the retention tank structure includes an oil retaining sill and a floor drain. The oil retaining sills are provided on both sides of the bottom of the transformer, and the floor drain connected to the discharge pipe assembly is provided between the oil retaining sills.

[0011] In some embodiments, the connecting pipe is U-shaped, the first end of the connecting pipe extends into the water layer after oil-water stratification in the static pool, the second end of the connecting pipe is arranged in the water outlet pool, and the elevation of the second end of the connecting pipe is higher than the elevation of the first end of the connecting pipe.

[0012] In some embodiments, the discharge pipe assembly includes a first discharge branch pipe, a second discharge branch pipe, and a discharge main pipe. The first end of the discharge main pipe is connected to the retention tank structure via the first discharge branch pipe, and the second end of the discharge main pipe is connected to the static tank via the second discharge branch pipe. A first isolation valve is provided on the second discharge branch pipe.

[0013] In some embodiments, a third discharge branch pipe leading to the tail water is provided at the connection between the discharge main pipe and the second discharge branch pipe, and a second isolation valve is provided on the third discharge branch pipe.

[0014] In some embodiments, the effluent pool is connected to a drain pipe leading to the tailwater.

[0015] In some embodiments, the net volume of the retention pond structure is no less than 20% of the volume of the transformer oil.

[0016] In some embodiments, inspection holes are provided at the tops of the static pool and the outlet pool, and ladders are installed below the inspection holes.

[0017] In some embodiments, ventilation holes are correspondingly provided on the tops of the static pool and the water outlet pool.

[0018] The beneficial effects of the utility model are:

[0019] 1. Rainwater or seepage water will form an oil-water mixture with the accident oil. The oil-water mixture can be collected through the retention tank structure to prevent the accident oil from spilling and causing pollution. The oil-water mixture is input into the static tank using the discharge pipe assembly. After the oil-water mixture is fully static in the static tank, it can form an oil-water stratification. The water in the water layer in the static tank is sent into the drainage tank by gravity through the connecting pipe, and then the water in the drainage tank is discharged to ensure that the discharged water meets environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of this application.

[0021] Description of reference numerals:

[0022] 1. Detention pool structure; 2. Accident oil pool structure; 3. Discharge pipe assembly; 4. Transformer; 5. Oil retaining sill; 6. Floor drain; 7. Static pool; 8. Water outlet pool; 9. Connecting pipe; 10. First discharge branch pipe; 11. Second discharge branch pipe; 12. Third discharge branch pipe; 13. Discharge main pipe; 14. First isolation valve; 15. Second isolation valve; 16. Drain pipe; 17. Inspection hole; 18. Vent hole.

[0023] This specification includes references to "one embodiment" or "an embodiment." The appearance of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. The particular features, structures or characteristics may be combined in any suitable manner consistent with the present disclosure.

[0024] The term "comprising" is open ended. As used in the appended claims, the term does not exclude additional structures or steps.

[0025] "First," "second," etc. As used herein, these terms act as labels for the nouns that precede them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.). DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model is further described below in conjunction with specific embodiments.

[0027] Combination Figure 1As shown, this embodiment is an accident oil discharge system for a transformer of a hydropower station, comprising a retention tank structure 1, an accident oil tank structure 2 and a discharge pipe assembly 3. The retention tank structure 1 is arranged at the bottom of the transformer 4, and the retention tank structure 1 is used to collect the oil-water mixture. The accident oil tank structure 2 is arranged below the retention tank structure 1, and the installation elevation of the accident oil tank structure 2 is lower than the installation elevation of the transformer 4. The accident oil tank structure 2 is a double tank structure, and the accident oil tank structure 2 comprises a static tank 7 and a water outlet tank 8. The static tank 7 and the water outlet tank 8 are separated by a partition wall, and a connecting pipe 9 is penetrated on the partition wall, so that the static tank 7 and the water outlet tank 8 are connected through the connecting pipe 9. The static tank 7 is used to statically hold the oil-water mixture and separate the oil and water into layers. The connecting pipe 9 can send the water in the water layer after the oil and water separation into the water outlet tank 8, and the water outlet tank 8 can discharge the internal water. The retention tank structure 1 is connected to the static tank 7 via a discharge pipe assembly 3 , and the discharge pipe assembly 3 is used to transport the oil-water mixture in the retention tank structure 1 to the static tank 7 .

[0028] In some embodiments, such as Figure 1 As shown, in this embodiment, a plurality of transformers 4 are arranged on the tailwater platform, specifically four transformers 4, and a retention tank structure 1 is arranged at the bottom of each of the four transformers 4. The retention tank structure 1 includes an oil retaining sill 5 and a floor drain 6. The oil retaining sill 5 is arranged on both sides of the bottom of the transformer 4, and a floor drain 6 is arranged between the oil retaining sill 5, and the floor drain 6 is connected to the discharge pipe assembly 3.

[0029] Furthermore, the net volume of the retention tank structure 1 is not less than 20% of the volume of the transformer oil.

[0030] An effective oil collection range is formed by the retention tank structure 1 to prevent accidental oil spillage and pollution.

[0031] In some embodiments, the connecting pipe 9 is U-shaped, and the first end of the connecting pipe 9 extends to a position close to the floor in the static pool 7, so that the first end of the connecting pipe 9 can be in the water layer after the oil and water are separated in the static pool 7, and the second end of the connecting pipe 9 is arranged in the water outlet pool 8, and the elevation of the second end of the connecting pipe 9 is higher than the elevation of the first end of the connecting pipe 9.

[0032] Furthermore, before the static pool 7 is put into use, a certain amount of clean water needs to be injected, and the clean water level can exceed the elevation of the first end of the U-shaped connecting pipe 9 in the static pool 7. After that, the clean water level is kept above this elevation for a long time. If the oil-water mixture enters the static pool, it will rush down into the water under the action of inertia and begin to stratify after equilibrium. Using the clean water layer at the bottom can ensure to a certain extent that no matter how the inertia of the incoming water is, the oil will not contact the port of the connecting pipe 9 in the static pool.

[0033] The purpose of designing the accident oil pool structure 2 as a double pool is to ensure that the oil-water mixture has sufficient time to be fully stratified in the static pool 7, and to ensure that the water discharged in the outlet pool 8 meets environmental protection requirements. The U-shaped connecting pipe 9 is used to flow the oil-free water in the bottom layer of the static pool 7 into the outlet pool 8 by gravity.

[0034] In some embodiments, the discharge pipe assembly 3 includes a first discharge branch pipe 10, a second discharge branch pipe 11 and a discharge main pipe 13. The floor drains 6 at the bottom of multiple transformers 4 are connected to the first end of the discharge main pipe 13 through the first discharge branch pipe 10. The second end of the discharge main pipe 13 is connected to the static tank 7 through the second discharge branch pipe 11. A first isolation valve 14 is installed on the second discharge branch pipe 11.

[0035] Furthermore, a third discharge branch pipe 12 leading to the tail water is provided at the connection between the discharge main pipe 13 and the second discharge branch pipe 11 , and a second isolation valve 15 is installed on the third discharge branch pipe 12 .

[0036] Furthermore, the outlet pool 8 is connected to a drainage pipe 16 leading to the tail water. In this embodiment, the drainage pipe 16 is connected to the end of the third discharge branch pipe 12 .

[0037] In some embodiments, the top plates of the static pool 7 and the outlet pool 8 are provided with inspection holes 17, and ladders are installed below the inspection holes 17. The top plates of the static pool 7 and the outlet pool 8 are provided with ventilation holes 18.

[0038] The implementation principle of an emergency oil discharge system for a hydropower station transformer 4 is as follows:

[0039] When the transformer 4 is operating normally or when the oil is discharged in an accident, the first isolation valve 14 is controlled to be opened and the second isolation valve 15 is controlled to be closed. When the transformer 4 is operating normally, the water entering the static pool 7 is mainly rainwater and a small amount of leakage water from the pipeline; when the transformer 4 is discharged in an accident, the water entering the static pool 7 is a mixture of oil and water. After sufficient static stratification in the static pool 7, when the liquid level in the static pool 7 exceeds the bottom elevation of the first end of the U-shaped connecting pipe 9, the water at the bottom without oil will flow to the outlet pool 8 through the connecting pipe 9. When the water level in the drainage pool exceeds the bottom elevation of the drainage pipe 16, the water in the drainage pool will flow to the tail water.

[0040] When the accident oil pool is under maintenance or needs to be cleaned, the first isolation valve 14 is controlled to be closed and the second isolation valve 15 is opened. A small amount of rainwater or pipeline leakage water in the retention pool structure 1 can flow to the tailwater by itself.

[0041] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An emergency oil discharge system for a hydropower station transformer, characterized in that: include: A retention tank structure (1) is arranged at the bottom of the transformer (4), and the retention tank structure (1) is used to collect the oil-water mixture; The accident oil pool structure (2) is arranged below the retention pool structure (1), and comprises a static pool (7) and a water outlet pool (8). The static pool (7) and the water outlet pool (8) are connected via a connecting pipe (9). The static pool (7) is used to statically place the oil-water mixture and separate the oil and water into layers. The connecting pipe (9) can send the water in the water layer after the oil and water are separated into layers into the water outlet pool (8). The water outlet pool (8) can discharge the water inside. A discharge pipe assembly (3) is provided between the retention tank structure (1) and the static tank (7), and the discharge pipe assembly (3) is used to transport the oil-water mixture in the retention tank structure (1) to the static tank (7).

2. The emergency oil discharge system for a hydropower station transformer according to claim 1, characterized in that: The retention tank structure (1) comprises an oil retaining sill (5) and a floor drain (6); the oil retaining sill (5) is provided on both sides of the bottom of the transformer (4); and the floor drain (6) connected to the discharge pipe assembly (3) is provided between the oil retaining sills (5).

3. The emergency oil discharge system for a hydropower station transformer according to claim 1, characterized in that: The connecting pipe (9) is U-shaped, and the first end of the connecting pipe (9) extends into the water layer after the oil and water are separated in the static pool (7). The second end of the connecting pipe (9) is arranged in the water outlet pool (8), and the elevation of the second end of the connecting pipe (9) is higher than the elevation of the first end of the connecting pipe (9).

4. The emergency oil discharge system for a hydropower station transformer according to claim 1, characterized in that: The discharge pipe assembly (3) comprises a first discharge branch pipe (10), a second discharge branch pipe (11), and a discharge main pipe (13); a first end of the discharge main pipe (13) is connected to the retention tank structure (1) via the first discharge branch pipe (10); a second end of the discharge main pipe (13) is connected to the stilling tank (7) via the second discharge branch pipe (11); and a first isolation valve (14) is provided on the second discharge branch pipe (11).

5. The emergency oil discharge system for a hydropower station transformer according to claim 4, characterized in that: A third discharge branch pipe (12) leading to the tail water is provided at the connection between the discharge main pipe (13) and the second discharge branch pipe (11), and a second isolation valve (15) is provided on the third discharge branch pipe (12).

6. The emergency oil discharge system for a hydropower station transformer according to claim 1, characterized in that: The outlet pool (8) is connected to a drainage pipe (16) leading to tail water.

7. The emergency oil discharge system for a hydropower station transformer according to claim 1, characterized in that: The net volume of the retention tank structure (1) is not less than 20% of the oil volume of the transformer (4).

8. The emergency oil discharge system for a hydropower station transformer according to claim 1, characterized in that: Inspection holes (17) are correspondingly provided at the tops of the static pool (7) and the water outlet pool (8), and a ladder is installed below the inspection hole (17).

9. The emergency oil discharge system for a transformer in a hydropower station according to claim 1, characterized in that: The tops of the static pool (7) and the water outlet pool (8) are both correspondingly provided with ventilation holes (18).

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