Low-voltage winding of oil-immersed power transformer

Abstract

The invention relates to the technical field of transformers, and discloses an oil-immersed power transformer low-voltage winding which comprises a front upper clamping plate and a rear upper clamping plate, two lower clamping plates are jointly installed below the two upper clamping plates, and a winding mechanism is arranged between the two upper clamping plates and the two lower clamping plates. The surfaces of the sides, away from the winding mechanism, of the two lower clamping plates are each provided with a plurality of protection mechanisms. An oil filtering mechanism is arranged above the two upper clamping plates; by arranging the protection mechanism, damage caused by mutual collision of the winding mechanism and the oil-immersed transformer shell is avoided, insulating oil in the oil-immersed transformer shell is pumped out through a conveying pump in the oil filtering mechanism and pumped into an oil filtering piece, impurities are filtered out through a filtering plate, and then the insulating oil is discharged into the oil-immersed transformer shell; the phenomenon that impurities generated when the insulating oil is used for a long time accumulate on the surface of the winding mechanism to affect normal heat dissipation is avoided, and the phenomenon that the impurities affect the insulating performance of the insulating oil is avoided.

Description

Technical Field

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

[0002] The distribution transformer is an important component of the substation. The oil-immersed transformer is generally installed in a separate transformer room. The low-voltage winding of the oil-immersed transformer generally adopts a cylindrical structure with copper foil winding, except for the small capacity using copper wire; the high-voltage winding adopts a multi-layer cylindrical structure, so that the ampere-turn distribution of the winding is balanced, the leakage magnetic field is small, the mechanical strength is high, and the short-circuit resistance is strong;

[0003] The existing installation method for oil-immersed transformers is mostly to first use lifting equipment to lift the winding to the inside of the box, and then inject oil into the inside to play the role of insulation and cooling. However, when the winding is lifted and installed, the winding cannot be directly and accurately docked with the top opening of the box, which makes it easy for the winding to collide with the inner wall of the box during descent, causing damage.

[0004] A Chinese patent discloses a low-voltage winding of an oil-immersed power transformer (authorization announcement number CN221651300U). The patent technology is provided with retraction rods installed on the surface and rear of the convex bottom frame, and a clamping frame and a guide wheel are installed at the front and rear ends of the retraction rods, respectively. The arrangement of these structures can use the guide wheels to correct and limit the protective top cover when it is lifted and docked with the outer frame of the transformer, so as to ensure that the convex bottom frame can be quickly lowered, and can prevent the winding body from colliding with the outer frame of the transformer, thereby protecting the equipment and meeting the current use;

[0005] However, it has certain disadvantages: as time goes by, impurities such as dust, metal particles, fibers, etc. will continue to be generated 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, causing the transformer temperature to rise, causing the transformer to overheat, and then cause a series of faults; and impurities may form a conductive bridge circuit, causing local discharge or short circuit, 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 object 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 technology.

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

[0008] A low-voltage winding of an oil-immersed power transformer comprises two front and rear upper clamping plates, the lower surfaces of the two upper clamping plates are fixedly connected to a plurality of upper pads, and two lower clamping plates are installed under the two upper clamping plates, the upper surfaces of the two lower clamping plates are fixedly connected to a plurality of lower pads, a winding mechanism is arranged between the two upper clamping plates and the two lower clamping plates, and a plurality of protective mechanisms are arranged on the surfaces of the two lower clamping plates on one side away from the winding mechanism;

[0009] An oil filter mechanism is commonly provided above the two upper clamping plates, and the oil filter mechanism comprises a delivery pump, a feed end of the delivery pump is fixedly connected to a first pipeline, a left end of the first pipeline is fixedly connected to a first valve, a lower end of the first valve is fixedly connected to a first connecting pipe, a discharge end of the delivery pump is fixedly connected to a second pipeline, an oil filter is provided at the right end of the second pipeline, a second valve is provided at the lower end of the oil filter, and a lower end of the second valve is fixedly connected to a second connecting pipe.

[0010] As a further solution 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 solution of the present invention: the protection mechanism includes a support tube, a spring is fixedly connected to the inner surface of one side of the support tube, one end of the spring is fixedly connected to a support rod, and 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 comprises an oil filter bin, a bin cover is fixedly connected to the upper end of the oil filter bin, and a fixed sleeve is installed inside the oil filter bin, the left and right side surfaces of the fixed sleeve are fixedly connected to fixing plates, and the inner left surface of the fixed sleeve is fixedly connected to a fixing rod, the upper surface of the fixed rod is fixedly connected to a flow probe, the interior of the fixed sleeve is located above the fixing rod and is rotatably connected to a rotating cylinder, the upper surface of the rotating cylinder is evenly penetrated by a plurality of filter cartridges connected by threads, the interior of the filter cartridge is fixedly connected to a filter plate, the outside of the rotating cylinder is fixedly connected to a first gear, the front surface of the fixed sleeve is fixedly connected to a fixing block, the lower surface of the fixed block is fixedly connected to a motor, and the output end of the motor is fixedly connected to a second gear.

[0013] As a further solution of the present invention: the number of the upper pads and the lower pads is equal, and the upper pads are directly opposite to the lower pads, and the spacing between two adjacent upper pads and two adjacent lower pads is equal.

[0014] As a further solution of the present invention: the upper end of the iron core is located between two upper clamping plates, and the lower end of the iron core is located between two lower clamping plates, and the coil is located between multiple upper pads and multiple lower pads.

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

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

[0017] As a further solution of the present invention: the end of the fixed plate is fixedly connected to the inner surface of the oil filter bin, the right end of the second pipe is opposite to the leftmost filter cartridge, and the right end of the second pipe is located above the leftmost filter cartridge, the flow probe is opposite to the leftmost filter cartridge, and the second gear is meshedly connected to the first gear.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention is provided with a protective mechanism. During the process of hoisting the winding mechanism into the oil-immersed transformer housing, the support member in the protective mechanism contacts the inner wall of the oil-immersed transformer housing and compresses the spring, thereby preventing the winding mechanism and the oil-immersed transformer housing from colliding with each other and being damaged.

[0020] 2. The present invention is provided with an oil filter mechanism. The delivery pump in the oil filter mechanism draws the insulating oil in the oil-immersed transformer housing and draws it into the oil filter element. The impurities are filtered out by the filter plate and then discharged into the oil-immersed transformer housing, thereby preventing the impurities generated by the insulating oil being used for too long from accumulating on the surface of the winding mechanism and affecting its normal heat dissipation, and also preventing the impurities from affecting the insulating performance of the insulating oil. The flow probe detects whether the leftmost filter plate is blocked. If it is blocked, the first motor drives the rotating cylinder to rotate so that the other filter plate is opposite to the second pipeline, thereby realizing the switching of the filter plates and avoiding the same filter plate being blocked after being used for too long and affecting the normal filtering after insulation. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0027] Figure 7 The present invention is a cross-sectional view of a fixed sleeve in a low-voltage winding of an oil-immersed power transformer.

[0028] In the figure: 1. upper clamping plate; 2. upper pad; 3. lower clamping plate; 4. lower pad; 5. winding mechanism; 6. iron core; 7. coil; 8. protection mechanism; 9. support tube; 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; 20. oil filter bin; 21. bin cover; 22. fixing sleeve; 23. fixing plate; 24. fixing rod; 25. flow probe; 26. rotating cylinder; 27. filter cartridge; 28. filter plate; 29. ​​first gear; 30. fixing block; 31. motor; 32. second gear; 33. second valve; 34. second connecting pipe. DETAILED DESCRIPTION

[0029] See also Figure 1 and Figure 2 In an embodiment of the present invention, a low-voltage winding of an oil-immersed power transformer includes two front and rear upper clamping plates 1, the lower surfaces of the two upper clamping plates 1 are commonly fixed with a plurality of upper pads 2, and two lower clamping plates 3 are commonly installed below the two upper clamping plates 1, the upper surfaces of the two lower clamping plates 3 are commonly fixed with a plurality of lower pads 4, 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, the spacing between two adjacent upper pads 2 and two adjacent lower pads 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, the outside of the iron core 6 is wound with a coil 7, and the coil 7 is located between the plurality of upper pads 2 and the plurality of lower pads 4;

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

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

[0032] exist Figure 1 and Figure 3 Middle: A plurality of protective mechanisms 8 are provided on the side surfaces of the two lower clamping plates 3 away from the winding mechanism 5. The protective mechanisms 8 include a support tube 9. One end of the support tube 9 is fixedly connected to the side surface of the lower clamping plate 3. A spring 10 is fixedly connected to the inner side surface of the support tube 9. One end of the spring 10 is fixedly connected to a support rod 11. The support rod 11 is slidably connected to the inside of the support tube 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 tube 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] When the entire winding mechanism 5 is hoisted 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, thereby avoiding damage to both.

[0036] exist Figure 1 , Figures 4 to 7 Middle: An oil filter mechanism 13 is commonly provided above the two upper clamping plates 1. The oil filter mechanism 13 includes a delivery pump 14. A first pipe 15 is fixedly connected to the feed end of the delivery pump 14. A first valve 16 is fixedly connected to the left end of the first pipe 15. A first connecting pipe 17 is fixedly connected to the lower end of the first valve 16. A second pipe 18 is fixedly connected to the discharge end of the delivery pump 14. An oil filter 19 is provided at the right end of the second pipe 18. The oil filter 19 includes an oil filter bin 20. A bin cover 21 is fixedly connected to the upper end of the oil filter bin 20. The right end of the second pipe 18 is connected to the bin cover 21. A fixed sleeve 22 is installed inside the oil filter bin 20. Fixed plates 23 are fixedly connected to the left and right side surfaces of the fixed sleeve 22. The end of the fixed plate 23 is fixedly connected to the inner surface of the oil filter bin 20. A fixed rod 24 is fixedly connected to the inner left surface of the fixed sleeve 22. A flow probe is fixedly connected to the upper surface of the fixed rod 24. 25, the interior of the fixed sleeve 22 is located above the fixed rod 24 and is rotatably connected with a rotating cylinder 26, and the upper surface of the rotating cylinder 26 is evenly penetrated with a plurality of filter cartridges 27 threadedly connected, the right end of the second pipe 18 is directly 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 directly opposite to the leftmost filter cartridge 27, the interior of the filter cartridge 27 is fixedly connected with a filter plate 28, the exterior of the rotating cylinder 26 is fixedly connected with a first gear 29, the front surface of the fixed sleeve 22 is fixedly connected with a fixed block 30, the lower surface of the fixed block 30 is fixedly connected with a motor 31, the output end of the motor 31 is fixedly connected with a second gear 32, and the second gear 32 is meshedly connected with the first gear 29, the lower end of the oil filter 19 is provided with a second valve 33, the lower end of the oil filter tank 20 is fixedly connected to the upper end of the second valve 33, and the lower end of the second valve 33 is fixedly connected with a second connecting pipe 34;

[0037] The delivery pump 14 is fixed to the upper surface of the oil-immersed transformer housing by bolts, and the insulating bushing is staggered;

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

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

[0040] The delivery pump 14 is used to draw the insulating oil in the oil-immersed transformer housing into the oil filter 19 for filtering, thereby reducing impurities in the insulating oil and preventing the impurities from accumulating on the surface of the winding mechanism 5 and affecting the normal heat dissipation of the winding mechanism 5; it also prevents the impurities from affecting the insulating properties of the insulating oil;

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

[0042] The lower surface of the right end of the second pipe 18 is slightly higher than the upper surface of the filter cartridge 27;

[0043] The motor 31 is provided with a brake, that is, after power is cut off, the motor shaft cannot rotate; the motor 31 is preferably a servo motor and a stepper motor, that is, it can rotate at a fixed angle each time it is started, and drives the rotating cylinder 26 to rotate through the first gear 29 and the second gear 32, so that different filter cartridges 27 are directly opposite to the second pipe 18, thereby avoiding the filter plates 28 in the same filter cartridge 27 from being blocked during the use time;

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

[0045] The delivery pump 14 , the first valve 16 , the second valve 33 , the motor 31 , and the flow sensor 25 are all electrically connected to an external control system for automatic operation.

[0046] The working principle of the present invention is: first, the staff uses the lifting equipment to lift the winding mechanism 5 to the inside of the oil-immersed transformer shell. In the process of lowering it to the inside of the oil-immersed transformer shell, the support member 12 touches the inner wall of the oil-immersed transformer shell, and the spring 10 is compressed after being compressed, thereby preventing the winding mechanism 5 from touching the inner wall of the oil-immersed transformer shell and causing damage to both; after the winding mechanism 5 is lifted to the inside of the oil-immersed transformer shell, the lower clamping plate is fixed together with the oil-immersed transformer shell, so that the entire winding mechanism 5 is fixed in the oil-immersed transformer shell; then, insulating oil is poured into the oil-immersed transformer shell and the shell cover is covered; the delivery pump 14 is fixed to the shell cover by bolts, the first pipe 15 and the second pipe 18 are passed through the pre-opened holes in the shell cover and fixed, and the connection between the pipe and the shell cover is sealed; at regular intervals, the external control system starts the delivery pump 14 and the first valve 16, the second valve 33 and the flow probe 25, the delivery pump 14 extracts the insulating oil in the oil-immersed transformer housing and discharges it through the second pipe 18, the insulating oil is filtered after passing through the filter plate 28 in the leftmost filter cartridge 27, the impurities therein are filtered out, and then it is re-discharged into the interior of the oil-immersed transformer housing along the second pipe 34; in this process, the flow probe 25 detects the flow of the insulating oil, when the flow is lower than the set value, the external control system controls the delivery pump 14 to close, the motor 31 starts to drive the rotating cylinder 26 to rotate a fixed angle through the second gear 32 and the first gear 29, so that the filter plate 28 in another filter cartridge 27 is opposite to the second pipe 18, then the motor 31 stops, the delivery pump 14 starts to continue pumping, so as to avoid the same filter plate 28 being blocked due to 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] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes 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), and the oil filter mechanism (13) comprises a delivery pump (14), a first pipe (15) is fixedly connected to the feed end of the delivery pump (14), a first valve (16) is fixedly connected to the left end of the first pipe (15), a first connecting pipe (17) is fixedly connected to the lower end of the first valve (16), a second pipe (18) is fixedly connected to the discharge end of the delivery pump (14), an oil filter (19) is provided at the right end of the second pipe (18), a second valve (33) is provided at the lower end of the oil filter (19), and a second connecting pipe (34) is fixedly connected to the lower end of the second valve (33).

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) is fixedly connected to one side surface of the inner side of the support tube (9), one end of the spring (10) is fixedly connected to a support rod (11), and one end of the support rod (11) is 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 oil filter element (19) comprises an oil filter bin (20), the upper end of the oil filter bin (20) is fixedly connected to a bin cover (21), and a fixing sleeve (22) is installed inside the oil filter bin (20), both left and right side surfaces of the fixing sleeve (22) are fixedly connected to fixing plates (23), and the inner left side surface of the fixing sleeve (22) is fixedly connected to a fixing rod (24), the upper surface of the fixing rod (24) is fixedly connected to a flow probe (25), and the interior of the fixing sleeve (22) is 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).

5. 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.

6. 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).

7. 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).

8. The low voltage winding of an oil-immersed power transformer according to claim 4, characterized in that: 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).

9. The low voltage winding of an oil-immersed power transformer according to claim 4, characterized in that: 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 meshedly connected to the first gear (29).

Images