A low-voltage winding of an oil-immersed power transformer

Abstract

The present invention relates to the technical field of transformers, and discloses a low-voltage winding of an oil-immersed power transformer, which includes two upper clamping plates at the front and rear. Two lower clamping plates are jointly installed below the two upper clamping plates. A winding mechanism is arranged between the two upper clamping plates and the two lower clamping plates. A plurality of protection mechanisms are arranged on the surfaces of the two lower clamping plates away from the winding mechanism; An oil filter mechanism is jointly arranged above the two upper clamping plates; By providing a protection mechanism, the present invention avoids the damage caused by the mutual collision between the winding mechanism and the oil-immersed transformer housing. The transfer pump in the oil filter mechanism pumps out the insulating oil in the oil-immersed transformer housing and pumps it into the oil filter element. After filtering out impurities through the filter plate, it is then discharged into the oil-immersed transformer housing, avoiding the accumulation of impurities generated by the long-term use of the insulating oil on the surface of the winding mechanism and affecting its normal heat dissipation, and also avoiding the impurities from affecting the insulating performance of the insulating oil.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and specifically, to a low-voltage winding of an oil-immersed power transformer. Background Art

[0002] Distribution transformers are important components of substations. Oil-immersed transformers are generally installed in separate transformer rooms. For the low-voltage windings of oil-immersed transformers, except for small-capacity ones using copper wires, generally, a cylindrical structure wound with copper foils is adopted; the high-voltage windings adopt a multi-layer cylindrical structure, making the ampere-turn distribution of the windings balanced, with small leakage magnetic flux, high mechanical strength, and strong short-circuit resistance.

[0003] Most of the existing installation methods for oil-immersed transformers are to first use lifting equipment to hoist the winding to the inside of the box body, and then inject oil into the inside to play the role of insulation and cooling. However, generally when hoisting and installing the winding, the winding cannot be directly and accurately docked with the top opening of the box body, resulting in easy collision between the winding and the inner wall of the box body during descent, causing damage.

[0004] Chinese Patent discloses a low-voltage winding of an oil-immersed power transformer (authorized announcement number CN221651300U). Through installing retraction rods on both the surface and the rear of the convex bottom frame, and installing a clamping frame and a guide wheel at the front and rear ends of the retraction rods respectively, the settings of these structures can, when the protective top cover is hoisted and docked with the transformer outer frame for installation, use the guide wheel to correct and limit it, ensure that the convex bottom frame can quickly descend, and can prevent the collision between the winding body and the transformer outer frame, protecting the equipment and meeting the current use.

[0005] However, it has certain drawbacks: over time, impurities such as dust, metal particles, and fibers will continuously generate in the insulating oil. These impurities will exist in the insulating oil for a long time and gradually accumulate on the surface of the winding body, which will affect the normal heat dissipation of the winding body, cause the temperature of the transformer to rise, trigger the overheating phenomenon of the transformer, and then trigger a series of faults; and the impurities may form a conductive bridge circuit, leading to partial discharge or short-circuit phenomena, thereby damaging the insulation system of the transformer. In the long run, this will seriously threaten the safe operation of the transformer. Summary of the Invention

[0006] The purpose of the present invention is to provide a low-voltage winding of an oil-immersed power transformer to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A low-voltage winding of an oil-immersed power transformer includes two upper clamping plates at the front and rear. A plurality of upper backing plates are fixedly connected to the lower surfaces of the two upper clamping plates. And two lower clamping plates are installed below the two upper clamping plates. A plurality of lower backing plates are fixedly connected to the upper surfaces of the two lower clamping plates. A winding mechanism is arranged between the two upper clamping plates and the two lower clamping plates. A plurality of protection mechanisms are arranged on the surfaces of the two lower clamping plates away from the winding mechanism.

[0009] An oil filter mechanism is arranged above the two upper clamping plates. The oil filter mechanism includes a transfer pump. The feed end of the transfer pump is fixedly connected to a first pipeline. The left end of the first pipeline is fixedly connected to a first valve. The lower end of the first valve is fixedly connected to a first connecting pipe. The discharge end of the transfer pump is fixedly connected to a second pipeline. An oil filter element is arranged at the right end of the second pipeline. A second valve is arranged at the lower end of the oil filter element. The lower end of the second valve is fixedly connected to a second connecting pipe.

[0010] As a further scheme of the present invention: The winding mechanism includes an iron core, and a coil is wound around the outside of the iron core.

[0011] As a further scheme of the present invention: The protection mechanism includes a support pipe. A spring is fixedly connected to one side surface inside the support pipe. One end of the spring is fixedly connected to a support rod. One end of the support rod is fixedly connected to a support member.

[0012] As a further scheme of the present invention: The oil filter element includes an oil filter chamber. A chamber cover is fixedly connected to the upper end of the oil filter chamber. And a fixed sleeve is installed inside the oil filter chamber. Fixing plates are fixedly connected to the left and right side surfaces of the fixed sleeve. And a fixing rod is fixedly connected to the left side surface inside the fixed sleeve. A flow probe is fixedly connected to the upper surface of the fixing rod. A rotating cylinder is rotatably connected above the fixing rod inside the fixed sleeve. A plurality of filter cylinders are uniformly threadedly connected through the upper surface of the rotating cylinder. A filter plate is fixedly connected inside the filter cylinder. A first gear is fixedly connected to the outside of the rotating cylinder. A fixed block is fixedly connected to the front surface of the fixed sleeve. A motor is fixedly connected to the lower surface of the fixed block. The output end of the motor is fixedly connected to a second gear.

[0013] As a further scheme of the present invention: The number of the upper backing plates is equal to that of the lower backing plates, and the upper backing plates are aligned with the lower backing plates. The distances between adjacent two upper backing plates and adjacent two lower backing plates are equal.

[0014] As a further scheme of the present invention: The upper end of the iron core is located between the two upper clamping plates, and the lower end of the iron core is located between the two lower clamping plates. The coil is located between the plurality of upper backing plates and the plurality of lower backing plates.

[0015] As a further scheme of the present invention: One end of the support pipe is fixedly connected to one side surface of the lower clamping plate, and the support rod is slidably connected inside the support pipe.

[0016] As a further solution of the present invention: the lower end of the oil filter chamber is fixedly connected to the upper end of the second valve, and the right end of the second pipe penetrates and is connected to the chamber cover.

[0017] As a further solution of the present invention: the end of the fixing plate is fixedly connected to the inner surface of the oil filter chamber, the right end of the second pipe faces the leftmost filter cartridge, and the right end of the second pipe is located above the leftmost filter cartridge. The flow probe faces the leftmost filter cartridge, and the second gear is meshed with the first gear.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. In the process of hoisting the winding mechanism into the oil-immersed transformer housing, the support member in the protection mechanism contacts the inner wall of the oil-immersed transformer housing and compresses the spring, avoiding damage caused by mutual collision between the winding mechanism and the oil-immersed transformer housing.

[0020] 2. By providing an oil filter mechanism, the transfer pump in the oil filter mechanism pumps out the insulating oil in the oil-immersed transformer housing and pumps it into the oil filter element. After filtering out impurities through the filter plate, it is then discharged back into the oil-immersed transformer housing, avoiding the accumulation of impurities generated during long-term use of the insulating oil on the surface of the winding mechanism, which affects its normal heat dissipation. Moreover, it also avoids the influence of impurities on the insulating performance of the insulating oil. The flow probe detects whether the leftmost filter plate is blocked. After it is blocked, the first motor drives the rotating cylinder to rotate, so that another filter plate faces the second pipe, realizing the switching use of the filter plate and avoiding the influence on the normal filtration of the insulating oil after the same filter plate is blocked after long-term use. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a low-voltage winding of an oil-immersed power transformer;

[0022] Figure 2 It is a schematic structural diagram of a winding mechanism in a low-voltage winding of an oil-immersed power transformer;

[0023] Figure 3 It is an exploded view of a protection mechanism in a low-voltage winding of an oil-immersed power transformer;

[0024] Figure 4 It is a schematic structural diagram of an oil filter mechanism in a low-voltage winding of an oil-immersed power transformer;

[0025] Figure 5 It is an exploded view of an oil filter element in a low-voltage winding of an oil-immersed power transformer;

[0026] Figure 6It is a partial schematic diagram of an oil filter component in the low-voltage winding of an oil-immersed power transformer;

[0027] Figure 7 It is a cross-sectional view of a fixing sleeve in the low-voltage winding of an oil-immersed power transformer.

[0028] In the figure: 1. Upper clamping plate; 2. Upper backing plate; 3. Lower clamping plate; 4. Lower backing plate; 5. Winding mechanism; 6. Iron core; 7. Coil; 8. Protection mechanism; 9. Support pipe; 10. Spring; 11. Support rod; 12. Support member; 13. Oil filter mechanism; 14. Delivery pump; 15. First pipeline; 16. First valve; 17. First connecting pipe; 18. Second pipeline; 19. Oil filter component; 20. Oil filter bin; 21. Bin cover; 22. Fixing sleeve; 23. Fixing plate; 24. Fixing rod; 25. Flow probe; 26. Rotating cylinder; 27. Filter cylinder; 28. Filter plate; 29. First gear; 30. Fixed block; 31. Motor; 32. Second gear; 33. Second valve; 34. Second connecting pipe. Specific embodiments

[0029] Please refer to Figure 1 and Figure 2 In the embodiments of the present invention, a low-voltage winding of an oil-immersed power transformer includes two front and rear upper clamping plates 1. A plurality of upper backing plates 2 are fixedly connected to the lower surfaces of the two upper clamping plates 1 together. And two lower clamping plates 3 are installed below the two upper clamping plates 1 together. A plurality of lower backing plates 4 are fixedly connected to the upper surfaces of the two lower clamping plates 3 together. The number of the upper backing plates 2 and the lower backing plates 4 is equal, and the upper backing plates 2 are opposite to the lower backing plates 4. The distances between adjacent two upper backing plates 2 and adjacent two lower backing plates 4 are equal. A winding mechanism 5 is arranged between the two upper clamping plates 1 and the two lower clamping plates 3. The winding mechanism 5 includes an iron core 6. The upper end of the iron core 6 is located between the two upper clamping plates 1, and the lower end of the iron core 6 is located between the two lower clamping plates 3. A coil 7 is wound around the outside of the iron core 6. The coil 7 is located between the plurality of upper backing plates 2 and the plurality of lower backing plates 4;

[0030] The winding mechanism 5 is hoisted into the interior of the oil-immersed transformer housing by a hoisting device;

[0031] The lower clamping plate 3 can be fixed on the inner lower surface of the oil-immersed transformer housing by bolts;.

[0032] In Figure 1 and Figure 3 : On one side surface of each of the two lower clamping plates 3 away from the winding mechanism 5, a plurality of protection mechanisms 8 are arranged. The protection mechanism 8 includes a support pipe 9. One end of the support pipe 9 is fixedly connected to one side surface of the lower clamping plate 3. On one side surface of the inner part of the support pipe 9, a spring 10 is fixedly connected. One end of the spring 10 is fixedly connected to a support rod 11. The support rod 11 is slidably connected to the interior of the support pipe 9. One end of the support rod 11 is fixedly connected to a support member 12;

[0033] The lower clamping plate 3 and the support pipe 9 can be fixed together by welding; the support rod 11 and the support member 12 can be fixed together by welding;

[0034] The support member 12 is preferably a sphere;

[0035] During the process of hoisting the entire winding mechanism 5 into the oil-immersed transformer housing, the support member 12 touches the inner wall of the oil-immersed transformer housing and compresses the spring 10, preventing the low-voltage winding from touching the inner wall of the oil-immersed transformer housing and avoiding damage to both.

[0036] In Figure 1 、 Figures 4 to 7 : Above the two upper clamping plates 1, an oil filter mechanism 13 is provided. The oil filter mechanism 13 includes a delivery pump 14. The feed end of the delivery pump 14 is fixedly connected to a first pipeline 15. The left end of the first pipeline 15 is fixedly connected to a first valve 16. The lower end of the first valve 16 is fixedly connected to a first connection pipe 17. The discharge end of the delivery pump 14 is fixedly connected to a second pipeline 18. The right end of the second pipeline 18 is provided with an oil filter element 19. The oil filter element 19 includes an oil filter chamber 20. The upper end of the oil filter chamber 20 is fixedly connected to a chamber cover 21. The right end of the second pipeline 18 penetrates and is connected to the chamber cover 21. Inside the oil filter chamber 20, a fixed sleeve 22 is installed. On the left and right side surfaces of the fixed sleeve 22, fixing plates 23 are fixedly connected. The ends of the fixing plates 23 are fixedly connected to the inner surface of the oil filter chamber 20. On the inner left side surface of the fixed sleeve 22, a fixed rod 24 is fixedly connected. On the upper surface of the fixed rod 24, a flow probe 25 is fixedly connected. Above the fixed rod 24 inside the fixed sleeve 22, a rotating cylinder 26 is rotatably connected. On the upper surface of the rotating cylinder 26, a plurality of filter cylinders 27 are uniformly connected in a threaded manner. The right end of the second pipeline 18 faces the leftmost filter cylinder 27, and the right end of the second pipeline 18 is located above the leftmost filter cylinder 27. The flow probe 25 faces the leftmost filter cylinder 27. Inside the filter cylinder 27, a filter plate 28 is fixedly connected. On the outer surface of the rotating cylinder 26, a first gear 29 is fixedly connected. On the front surface of the fixed sleeve 22, a fixed block 30 is fixedly connected. On the lower surface of the fixed block 30, a motor 31 is fixedly connected. The output end of the motor 31 is fixedly connected to a second gear 32. The second gear 32 is meshed and connected to the first gear 29. At the lower end of the oil filter element 19, a second valve 33 is provided. The lower end of the oil filter chamber 20 is fixedly connected to the upper end of the second valve 33. The lower end of the second valve 33 is fixedly connected to a second connection pipe 34;

[0037] The delivery pump 14 is fixedly connected to the upper surface of the oil-immersed transformer housing by bolts and should be staggered from the insulating bushing;

[0038] Both the first connection pipe 17 and the second connection pipe 34 penetrate and are connected to the upper surface of the oil-immersed transformer housing and extend into the insulating oil;

[0039] Both the first valve 16 and the second valve 33 are preferably electric valves;

[0040] The transfer pump 14 is used to pump the insulating oil in the oil-immersed transformer housing into the oil filter 19 for filtration, reducing the impurities in the insulating oil, avoiding the accumulation of impurities on the surface of the winding mechanism 5 and affecting the normal heat dissipation of the winding mechanism 5; it also avoids the influence of impurities on the insulation performance of the insulating oil.

[0041] The filter plate 28 plays a filtering role.

[0042] The lower surface of the right end of the second pipeline 18 is slightly higher than the upper surface of the filter cylinder 27.

[0043] The motor 31 is equipped with a brake, that is, after power-off, the motor shaft cannot rotate; the motor 31 is preferably a servo motor and a stepping motor, that is, it can rotate a fixed angle each time it starts, and drives the rotating cylinder 26 to rotate through the first gear 29 and the second gear 32, so that different filter cylinders 27 are aligned with the second pipeline 18, avoiding the blockage of the filter plate 28 in the same filter cylinder 27 due to long-term use.

[0044] The flow probe 25 is used to detect the flow rate of the flowing insulating oil. When the flow rate is lower than the set value, it indicates that the filter plate 28 is blocked. At this time, the external control system controls the motor 31 to start.

[0045] The transfer pump 14, the first valve 16, the second valve 33, the motor 31, and the flow probe 25 are all electrically connected to the external control system, so as to operate automatically.

[0046] The working principle of the present invention is as follows: First, the staff uses a hoisting device to hoist the winding mechanism 5 into the interior of the oil-immersed transformer housing. During the process of lowering it into the interior of the oil-immersed transformer housing, the support member 12 touches the inner wall of the oil-immersed transformer housing, and after being pressed, the compression spring 10 is compressed, avoiding damage to both the winding mechanism 5 and the inner wall of the oil-immersed transformer housing when they touch each other. After hoisting the winding mechanism 5 into the interior of the oil-immersed transformer housing, the lower clamping plate is fixed to the oil-immersed transformer housing, thereby fixing the entire winding mechanism 5 in the oil-immersed transformer housing. Then, insulating oil is poured into the oil-immersed transformer housing and the shell cover is covered. The delivery pump 14 is fixed to the shell cover by bolts, the first pipeline 15 and the second pipeline 18 are passed through the holes pre-opened in the shell cover and fixed, and the connection between the pipeline and the shell cover is sealed. At regular intervals, the external control system starts the delivery pump 14, the first valve 16, the second valve 33, and the flow probe 25. The delivery pump 14 pumps out the insulating oil in the oil-immersed transformer housing and discharges it through the second pipeline 18. The insulating oil is filtered after passing through the filter plate 28 in the leftmost filter cartridge 27, and the impurities therein are filtered out, and then it is re-discharged into the interior of the oil-immersed transformer housing along the second connecting pipe 34. During this process, the flow probe 25 detects the flow rate of the insulating oil. When the flow rate is lower than the set value, the external control system controls the delivery pump 14 to close, and the motor 31 starts to drive the rotating cylinder 26 to rotate by a fixed angle through the second gear 32 and the first gear 29, so that the filter plate 28 in another filter cartridge 27 faces the second pipeline 18. Then the motor 31 stops and the delivery pump 14 starts to pump again, avoiding blockage of the same filter plate 28 due to too long use time. After a period of time, the external control system closes the delivery pump 14, the first valve 16, the second valve 33, and the flow probe 25.

[0047] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0048] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-voltage winding of an oil-immersed power transformer, comprising two front and rear upper clamping plates (1), the lower surfaces of the two upper clamping plates (1) being fixedly connected to a plurality of upper pads (2), and two lower clamping plates (3) being installed under the two upper clamping plates (1), the upper surfaces of the two lower clamping plates (3) being fixedly connected to a plurality of lower pads (4), a winding mechanism (5) being arranged between the two upper clamping plates (1) and the two lower clamping plates (3), and a plurality of protective mechanisms (8) being arranged on the surfaces of the two lower clamping plates (3) on one side away from the winding mechanism (5); It is characterized in that An oil filter mechanism (13) is commonly provided above the two upper clamping plates (1), the oil filter mechanism (13) comprising a delivery pump (14), a first pipe (15) being fixedly connected to a feed end of the delivery pump (14), a first valve (16) being fixedly connected to a left end of the first pipe (15), a first connecting pipe (17) being fixedly connected to a lower end of the first valve (16), a second pipe (18) being fixedly connected to a discharge end of the delivery pump (14), an oil filter (19) being provided at a right end of the second pipe (18), a second valve (33) being provided at a lower end of the oil filter (19), and a second connecting pipe (34) being fixedly connected to a lower end of the second valve (33); The oil filter element (19) comprises an oil filter bin (20), a bin cover (21) being fixedly connected to the upper end of the oil filter bin (20), a fixing sleeve (22) being installed inside the oil filter bin (20), fixing plates (23) being fixedly connected to the left and right side surfaces of the fixing sleeve (22), a fixing rod (24) being fixedly connected to the left side surface of the inside of the fixing sleeve (22), a flow probe (25) being fixedly connected to the upper surface of the fixing rod (24), and the inside of the fixing sleeve (22) being located at the fixing rod (24). A rotating cylinder (26) is rotatably connected to the upper side of the rotating cylinder (26); a plurality of filter cylinders (27) are evenly threadedly connected to the upper surface of the rotating cylinder (26); a filter plate (28) is fixedly connected to the inside of the filter cylinder (27); a first gear (29) is fixedly connected to the outside of the rotating cylinder (26); a fixing block (30) is fixedly connected to the front surface of the fixing sleeve (22); a motor (31) is fixedly connected to the lower surface of the fixing block (30); and a second gear (32) is fixedly connected to the output end of the motor (31); The lower end of the oil filter bin (20) is fixedly connected to the upper end of the second valve (33), and the right end of the second pipeline (18) is connected to the bin cover (21); The end of the fixing plate (23) is fixedly connected to the inner surface of the oil filter bin (20), the right end of the second pipe (18) is opposite to the leftmost filter cartridge (27), and the right end of the second pipe (18) is located above the leftmost filter cartridge (27), the flow probe (25) is opposite to the leftmost filter cartridge (27), and the second gear (32) is meshingly connected to the first gear (29).

2. The low-voltage winding of an oil-immersed power transformer according to claim 1, characterized in that: The winding mechanism (5) comprises an iron core (6), and a coil (7) is wound around the outside of the iron core (6).

3. The low-voltage winding of an oil-immersed power transformer according to claim 1, characterized in that: The protection mechanism (8) comprises a support tube (9), a spring (10) being fixedly connected to a surface of one side of the interior of the support tube (9), one end of the spring (10) being fixedly connected to a support rod (11), and one end of the support rod (11) being fixedly connected to a support member (12).

4. The low-voltage winding of an oil-immersed power transformer according to claim 1, characterized in that: The number of the upper pads (2) and the number of the lower pads (4) are equal, and the upper pads (2) are directly opposite to the lower pads (4), and the spacing between two adjacent upper pads (2) and two adjacent lower pads (4) is equal.

5. The low voltage winding of an oil-immersed power transformer according to claim 2, characterized in that: The upper end of the iron core (6) is located between two upper clamping plates (1), and the lower end of the iron core (6) is located between two lower clamping plates (3); the coil (7) is located between a plurality of upper pads (2) and a plurality of lower pads (4).

6. The low voltage winding of an oil-immersed power transformer according to claim 3, characterized in that: One end of the support tube (9) is fixedly connected to a side surface of the lower clamping plate (3), and the support rod (11) is slidably connected to the inside of the support tube (9).

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