A vacuum oil filling system for transformer

Abstract

The invention discloses a transformer vacuum oil filling system, comprising a vacuum pumping part, a transformer and an oil filling part which are sequentially connected, the vacuum pumping part is connected to the upper end of the transformer, and the oil filling part is connected to the lower end of the transformer; the oil filling part comprises a vacuum oil filling pipe, an oil filter, a first oil tank, a second oil tank, an oil replenishing hanging tank, a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit and a fifth oil circuit; the first oil tank and the second oil tank are both connected to the oil filter, the second oil tank and the vacuum oil filling pipe are respectively connected to the first oil tank, the oil replenishing hanging tank is respectively connected to the oil filter and the first oil tank through a connecting pipe, a transformer oil filling port is arranged at the oil outlet of the oil replenishing hanging tank, and a vacuum oil filling port is arranged at the vacuum oil filling pipe; the various modules of the invention cooperate with each other, the logic is tight, and the oil filling of the transformer under different use environments and requirements can be well met, the integration of oil filtering, oil filling, vacuum oil filling and oil replenishing is realized, and the vacuum oil filling effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of transformers, and in particular relates to a transformer vacuum oil injection system. Background Art

[0002] As transformer oil has been widely used as the insulating medium and cooling medium of oil-immersed transformers, the operation of injecting transformer oil is required after the oil-immersed transformer is assembled and capped. At present, the general method of injecting oil into the oil tank is to directly inject transformer oil into the oil tank from the oil injection nozzle on the box cover. This oil injection method has the advantages of simple operation, no need for complex equipment and pipelines, etc. The disadvantage is that some water and a large amount of air will be mixed in during the oil injection process. After the oil is injected, it needs to be left for a long time to allow the internal air to be discharged. In addition, it also affects the discharge of moisture inside the oil tank and reduces the insulation strength of the transformer oil.

[0003] At the same time, there are also some common transformer vacuum oil filling devices on the market. These vacuum oil filling devices use vacuum pressure to press the oil in the oil storage tank into the transformer. Due to the high vacuum pressure itself, the oil pressure is too high during the oil filling process, which leads to too fast oil filling speed and easy generation of bubbles in the transformer oil tank. At the same time, since the power of the oil filling itself uses vacuum pressure, when the transformer oil tank is about to be filled, it is difficult for the operator to control the transformer oil tank to be just filled. The transformer oil tank is often not fully filled or the transformer oil overflows into the leakage pipeline, which is very inconvenient to operate and clean, and is time-consuming and labor-intensive.

[0004] In addition, the existing transformer vacuum oil filling device does not separate vacuuming and oil filling into two modules for logically tight operation, resulting in large errors in overall operation, and the oil filling cannot meet the use requirements of various complex situations. Summary of the invention

[0005] In view of this, in order to solve the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a transformer vacuum oil filling system, in which each module cooperates with each other and has tight logic, which can well meet the oil filling of transformers under different usage environments and requirements, realize the integration of oil filtering, oil filling, vacuum oil filling and oil replenishment, and have good vacuum oil filling effect.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A transformer vacuum oil injection system comprises a vacuum pumping part, a transformer and an oil injection part which are sequentially connected, wherein the vacuum pumping part is connected to the upper end of the transformer, and the oil injection part is connected to the lower end of the transformer;

[0008] The oil filling part includes a vacuum oil filling pipe, an oil filter, a first oil tank, a second oil tank, an oil replenishing hanging tank, a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit and a fifth oil circuit; the first oil tank and the second oil tank are both connected to the oil filter, the second oil tank and the vacuum oil filling pipe are respectively connected to the first oil tank, the oil replenishing hanging tank is respectively connected to the oil filter and the first oil tank through a connecting pipe, a transformer oil filling port is arranged at the oil outlet of the oil replenishing hanging tank, and a vacuum oil filling port is arranged at the vacuum oil filling pipe;

[0009] The second oil tank passes through the fourth valve, the seventh valve, the oil filter, and the second valve in sequence to the first oil tank to form a first oil circuit, the first oil tank passes through the third valve, the seventh valve, the oil filter, and the second valve in sequence to return to the first oil tank to form a second oil circuit and realize the self-filtering oil stage, the first oil tank passes through the third valve, the seventh valve, the oil filter, and the fifth valve in sequence to the transformer oil filling port to form a third oil circuit and realize the transformer oil filling stage, the first oil tank passes through the third valve and the eighth valve in sequence to the vacuum oil filling pipe to form a fourth oil circuit and realize the vacuum oil filling stage, the first oil tank passes through the third valve, the seventh valve, the oil filter, and the first valve in sequence to the oil replenishment hanging tank, the oil replenishment hanging tank passes through the sixth valve to the transformer oil filling port to form a fifth oil circuit and realize the transformer oil replenishment stage;

[0010] The vacuuming part includes a vacuum box, a vacuum tank and a vacuum pump which are interconnected. The vacuum pump is connected to the top of the transformer. The vacuum pump is connected to the vacuum tank through the ninth valve and the tenth valve and constitutes a vacuum drying treatment stage. The vacuum pump is connected to the vacuum box through the ninth valve and the eleventh valve and constitutes a vacuuming stage for the oil-filled transformer.

[0011] Furthermore, the transformer oil filling port is connected to one side of the bottom of the transformer.

[0012] Furthermore, there are multiple vacuum oil filling ports, and all of the multiple vacuum oil filling ports are connected to one side of the bottom of the transformer.

[0013] Furthermore, the number of the vacuum oil filling ports is 8.

[0014] Furthermore, the vacuum box has 8 corresponding vacuum tubes.

[0015] Furthermore, the vacuum box is provided with a vacuum meter for real-time monitoring.

[0016] Furthermore, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve are all one-way valves.

[0017] Furthermore, the pressure of the vacuum tank is 0.02-0.04 MPa.

[0018] The beneficial effects of the present invention are:

[0019] The transformer vacuum oil filling system of the present invention has various modules that cooperate with each other and have tight logic, which can well meet the transformer oil filling requirements under different use environments and requirements, realize the integration of oil filtering, oil filling, vacuum oil filling and oil replenishment, and has good vacuum oil filling effect. Specifically, it is manifested in:

[0020] The vacuuming part performs vacuum drying of the transformer and vacuuming of the transformer to be filled with oil on the top of the transformer, and all of them are stopped in accordance with relevant process regulations; the oil filling part performs oil filling and oil replenishment operations on the bottom side of the transformer according to different needs, including the oil circulation stage between oil tanks, namely the first oil circuit, the self-filtering oil stage, namely the second oil circuit, the transformer oil filling stage, namely the third oil circuit, the vacuum oil filling stage, namely the fourth oil circuit, and the transformer oil replenishment stage, namely the fifth oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the oil injection part;

[0024] Figure 3 It is a structural schematic diagram of the vacuum pumping part;

[0025] Markings in the figure: 1. First valve, 2. Second valve, 3. Third valve, 4. Fourth valve, 5. Fifth valve, 6. Sixth valve, 7. Seventh valve, 8. Eighth valve, 9. Ninth valve, 10. Tenth valve, 11. Eleventh valve, 12. Vacuuming part, 13. Transformer, 14. Oil filling part, 15. Vacuum oil filling pipe, 16. Oil filter, 17. First oil tank, 18. Second oil tank, 19. Oil replenishing hanging tank, 20. Transformer oil filling port, 21. Vacuum oil filling port, 22. Vacuum box, 23. Vacuum tank, 24. Vacuum pump, 25. Vacuum pipe, 26. Vacuum gauge. DETAILED DESCRIPTION

[0026] The following specific examples are given to further clearly, completely and in detail illustrate the technical solution of the present invention. This example is the best example based on the technical solution of the present invention, but the protection scope of the present invention is not limited to the following examples.

[0027] A transformer vacuum oil injection system comprises a vacuum pumping part 12, a transformer 13 and an oil injection part 14 which are sequentially connected, wherein the vacuum pumping part 12 is connected to the upper end of the transformer 13, and the oil injection part 14 is connected to the lower end of the transformer 13;

[0028] The oil filling part 14 includes a vacuum oil filling pipe 15, an oil filter 16, a first oil tank 17, a second oil tank 18, an oil replenishing hanging tank 19, a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit and a fifth oil circuit; the first oil tank 17 and the second oil tank 18 are both connected to the oil filter 16, the second oil tank 18 and the vacuum oil filling pipe 15 are respectively connected to the first oil tank 17, the oil replenishing hanging tank 19 is respectively connected to the oil filter 16 and the first oil tank 17 through a connecting pipe, a transformer oil filling port 20 is provided at the oil outlet of the oil replenishing hanging tank 19, and a vacuum oil filling port 21 is provided at the vacuum oil filling pipe 15;

[0029] The second oil tank 18 passes through the fourth valve 4, the seventh valve 7, the oil filter 16, and the second valve 2 in sequence to the first oil tank 17 to form a first oil circuit, the first oil tank 17 passes through the third valve 3, the seventh valve 7, the oil filter 16, and the second valve 2 in sequence and then returns to the first oil tank 17 to form a second oil circuit and realize the self-filtering oil stage, the first oil tank 17 passes through the third valve 3, the seventh valve 7, the oil filter 16, and the fifth valve 5 in sequence to the transformer oil filling port 20 to form a third oil circuit and realize the transformer oil filling stage, the first oil tank 17 passes through the third valve 3 and the eighth valve 8 in sequence to the vacuum oil filling pipe 15 to form a fourth oil circuit and realize the vacuum oil filling stage, the first oil tank 17 passes through the third valve 3, the seventh valve 7, the oil filter 16, and the first valve 1 in sequence to the oil replenishment hanging tank 19, the oil replenishment hanging tank 19 passes through the sixth valve 6 to the transformer oil filling port 20 to form a fifth oil circuit and realize the transformer oil replenishment stage;

[0030] The vacuuming part 12 includes a vacuum box 22, a vacuum tank 23 and a vacuum pump 24 which are interconnected. The vacuum pump 24 is connected to the top of the transformer 13. The vacuum pump 24 is connected to the vacuum tank 23 through the ninth valve 9 and the tenth valve 10 and constitutes a vacuum drying treatment stage. The vacuum pump 24 is connected to the vacuum box 22 through the ninth valve 9 and the eleventh valve 11 and constitutes a vacuuming stage for the oil-filled transformer.

[0031] Furthermore, the first valve 1 , the second valve 2 , the third valve 3 , the fourth valve 4 , the fifth valve 5 , the sixth valve 6 , the seventh valve 7 , and the eighth valve 8 are all one-way valves.

[0032] Furthermore, the pressure of the vacuum tank 23 is 0.02-0.04 MPa.

[0033] Furthermore, the vacuum box 22 is provided with a vacuum meter 26 for real-time monitoring.

[0034] Furthermore, the transformer oil filling port 20 is communicated with one side of the bottom of the transformer 13 .

[0035] Furthermore, there are multiple vacuum oil filling ports 21 , and all of the multiple vacuum oil filling ports 21 are connected to one side of the bottom of the transformer 13 .

[0036] Furthermore, the number of the vacuum oil filling ports 21 is 8.

[0037] Furthermore, the vacuum box 22 has eight vacuum tubes 25 .

[0038] Furthermore, the vacuum oil filling pipe 15 and the vacuum extraction pipe 25 are both provided with valves.

[0039] Furthermore, the first oil tank 17 is a 5T oil tank, the second oil tank 18 is a 30T oil tank, and the oil replenishment hanging tank 19 is a 2T hanging tank.

[0040] The working principle of the present invention is:

[0041] The vacuuming part 12 performs vacuum drying of the transformer and vacuuming of the transformer to be filled with oil at the top of the transformer 13, and stops the process according to the relevant regulations; the oil filling part 14 performs oil filling and oil replenishment operations at one side of the bottom of the transformer 13 according to different needs, including the oil circulation stage between oil tanks, i.e. the first oil circuit, the self-filtering oil stage, i.e. the second oil circuit, the transformer oil filling stage, i.e. the third oil circuit, the vacuum oil filling stage, i.e. the fourth oil circuit, and the transformer oil replenishment stage, i.e. the fifth oil circuit;

[0042] Among them, the working principle of the vacuum part 12 is:

[0043] 1. During vacuum drying, close the eleventh valve 11, open the ninth valve 9 and the tenth valve 10, and stop the process according to the prescribed process;

[0044] 2. When the oil-filled transformer is evacuated, close the tenth valve 10, open the ninth valve 9 and the eleventh valve 11, and stop the process according to the prescribed process;

[0045] Among them, the working principle of the oil injection part 14 is:

[0046] 1. From the second oil tank 18 to the first oil tank 17: the first valve 1, the third valve 3, the fifth valve 5, the sixth valve 6, and the eighth valve 8 are closed, and the second valve 2, the fourth valve 4, and the seventh valve 7 are opened. After the 5T first oil tank 17 reaches the specified height, the oil filter 16 stops, realizing the oil circulation stage between the oil tanks, i.e., the first oil circuit;

[0047] Second, the first oil tank 17 self-filters the oil: the first valve 1, the fourth valve 4, the fifth valve 5, the sixth valve 6, and the eighth valve 8 are closed, and the second valve 2, the third valve 3, and the seventh valve 7 are opened. After the internal oil reaches the specified standard, the oil filter 16 stops, realizing the self-filtering stage, i.e., the second oil circuit;

[0048] 3. Oil filling of transformer 13: the first valve 1, the second valve 2, the fourth valve 4, the sixth valve 6, and the eighth valve 8 are closed, and the third valve 3, the fifth valve 5, and the seventh valve 7 are opened. After the oil is filled to a suitable amount, the oil filter 16 stops, and the transformer oil filling stage, i.e., the third oil circuit, is realized;

[0049] 4. Vacuum oil filling: the first valve 1, the second valve 2, the fourth valve 4, the fifth valve 5, the sixth valve 6, and the seventh valve 7 are closed, the third valve 3 and the eighth valve 8 are opened, and the oil filling stops at the predetermined position, realizing the vacuum oil filling stage, i.e. the fourth oil circuit;

[0050] 5. Transformer oil replenishment: First, close the second valve 2, the fourth valve 4, the fifth valve 5, the sixth valve 6, and the eighth valve 8, and open the first valve 1, the third valve 3, and the seventh valve 7. After the oil in the 2T oil replenishment hanging tank 19 reaches the specified height, the oil filter 16 stops; then close the first valve 1 and the fifth valve 5, and open the sixth valve 6 to replenish oil. This realizes the transformer oil replenishment stage, i.e., the fifth oil circuit.

[0051] In summary, the transformer vacuum oil filling system of the present invention has various modules that cooperate with each other and have tight logic, which can well meet the transformer oil filling requirements under different use environments and requirements, realize the integration of oil filtering, oil filling, vacuum oil filling, and oil replenishment, and has a good vacuum oil filling effect.

[0052] The above shows and describes the main features, basic principles and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements according to actual conditions, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A transformer vacuum oil filling system, characterized in that: It comprises a vacuum pumping part (12), a transformer (13) and an oil injection part (14) which are sequentially connected, the vacuum pumping part (12) being connected to the upper end of the transformer (13), and the oil injection part (14) being connected to the lower end of the transformer (13); The oil injection part (14) comprises a vacuum oil injection pipe (15), an oil filter (16), a first oil tank (17), a second oil tank (18), an oil supply hanging tank (19), a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit and a fifth oil circuit; the first oil tank (17) and the second oil tank (18) are both connected to the oil filter (16); the second oil tank (18) and the vacuum oil injection pipe (15) are respectively connected to the first oil tank (17); the oil supply hanging tank (19) is respectively connected to the oil filter (16) and the first oil tank (17) via a connecting pipe; a transformer oil injection port (20) is provided at the oil outlet of the oil supply hanging tank (19); and a vacuum oil injection port (21) is provided at the vacuum oil injection pipe (15); The second oil tank (18) passes through the fourth valve (4), the seventh valve (7), the oil filter (16), and the second valve (2) in sequence before reaching the first oil tank (17) to form a first oil circuit. The first oil tank (17) passes through the third valve (3), the seventh valve (7), the oil filter (16), and the second valve (2) in sequence before returning to the first oil tank (17) to form a second oil circuit and realize a self-filtering oil stage. The first oil tank (17) passes through the third valve (3), the seventh valve (7), the oil filter (16), and the fifth valve (5) in sequence before reaching the pressure transformer (16). The transformer oil filling port (20) forms a third oil circuit and implements the transformer oil filling stage; the first oil tank (17) sequentially passes through the third valve (3) and the eighth valve (8) to reach the vacuum oil filling pipe (15) to form a fourth oil circuit and implements the vacuum oil filling stage; the first oil tank (17) sequentially passes through the third valve (3), the seventh valve (7), the oil filter (16), and the first valve (1) to reach the oil replenishment hanging tank (19); the oil replenishment hanging tank (19) passes through the sixth valve (6) to reach the transformer oil filling port (20) to form a fifth oil circuit and implements the transformer oil replenishment stage; The vacuum pumping part (12) comprises a vacuum box (22), a vacuum tank (23) and a vacuum pump (24) which are connected to each other. The vacuum pump (24) is connected to the top of the transformer (13). The vacuum pump (24) is connected to the vacuum tank (23) through a ninth valve (9) and a tenth valve (10) and constitutes a vacuum drying treatment stage. The vacuum pump (24) is connected to the vacuum box (22) through a ninth valve (9) and an eleventh valve (11) and constitutes an oil-filled transformer vacuum pumping stage. The transformer oil filling port (20) is connected to the bottom side of the transformer (13). There are a plurality of vacuum oil filling ports (21), and all of the plurality of vacuum oil filling ports (21) are connected to the bottom side of the transformer (13).

2. A transformer vacuum oil filling system according to claim 1, characterized in that: The number of the vacuum oil filling ports (21) is 8.

3. A transformer vacuum oil filling system according to claim 1, characterized in that: The vacuum box (22) has eight vacuum pipes (25) correspondingly.

4. A transformer vacuum oil filling system according to claim 1, characterized in that: The vacuum box (22) is provided with a vacuum meter (26) for real-time monitoring.

5. A transformer vacuum oil filling system according to claim 1, characterized in that: The first valve (1), the second valve (2), the third valve (3), the fourth valve (4), the fifth valve (5), the sixth valve (6), the seventh valve (7), and the eighth valve (8) are all one-way valves.

6. A transformer vacuum oil filling system according to claim 1, characterized in that: The pressure of the vacuum tank (23) is 0.02-0.04 MPa.

Images