Three-dimensional wound core oil-immersed intelligent power transformer and method

Abstract

The invention discloses a three-dimensional wound core oil-immersed intelligent power transformer and a method, and relates to the technical field of oil-immersed intelligent transformers. The three-dimensional wound core oil-immersed intelligent power transformer comprises material control devices, and each material control device is used for controlling communication or closing of the bottom of a barrel and the top of a hole channel and enabling an attached scrap suction rolling ball to fall to a triangular rail conveying device. The triangular rail conveying device is used for guiding the internally-attached chip suction rolling ball to roll along a preset route under the action of the gravity of the internally-attached chip suction rolling ball and collecting metal chips in liquid. According to the three-dimensional wound core oil-immersed intelligent power transformer and the method, the path is prolonged through the continuous V-shaped triangular slide way, the tip end of the slide way makes contact with the rolling ball, the adsorption tank fully captures suspended scrap iron in oil, and the adsorption efficiency is improved; the ball is put down regularly, the slide way adsorbs scrap iron, the bottom cylinder collects scrap iron, and a full-closed-loop process is formed and is convenient to clean; and the material control device realizes timed independent lowering of the internal scrap suction rolling ball, so that automatic control is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil-immersed intelligent transformers, in particular to a three-dimensional wound core oil-immersed intelligent power transformer and method. BACKGROUND

[0002] The three-dimensional wound core oil-immersed intelligent power transformer is a power conversion device with a three-dimensional wound core as the core of the magnetic circuit, transformer oil as the cooling insulating medium, and integrated intelligent monitoring and control functions, mainly used in power systems to realize voltage rise and fall, power transmission and distribution.

[0003] Referring to Chinese Patent Publication No. CN109659117B, a kind of three-dimensional wound core oil-immersed transformer belongs to oil-immersed transformer field, a kind of three-dimensional wound core oil-immersed transformer, including transformer body, transformer body is fixedly connected with transformer oil tank, the outer end of transformer oil tank is fixedly connected with fin, the inner end of transformer oil tank is fixedly connected with a plurality of leak repair fiber bodies, a plurality of leak repair fiber bodies are cross-distributed, a cavity is formed in the leak repair fiber body, the lower end of transformer oil tank is provided with pressure sensor, the outer end of pressure sensor is electrically connected with external power supply, pressure sensor is fixedly connected with transformer body, the outer end of pressure sensor is electrically connected with maintenance mechanism, compared with the oil tank shell in the prior art, the leak repair fiber body is embedded in the inner end wall of the transformer oil tank shell, which can enhance the strength of the transformer oil tank, and different substances can be filled in the cavity to achieve different functions.

[0004] When the transformer is running, some mechanical parts inside, such as the bearings and impellers of submersible pumps, will produce metal powder due to friction and wear. The insulating oil that has been running for a long time will age due to factors such as electric field intensity, high temperature, humidity, and oxidation. Acidic substances in the aging products can corrode the metal materials inside the transformer, such as windings, cores, and oil tanks, causing metal particles to fall off. Metal debris has very strong conductivity and, under the action of the electric field inside the transformer, can cause serious distortion of the local electric field, easily causing partial discharge, thereby reducing the insulation strength of the transformer oil. In severe cases, it may cause insulation breakdown, causing a major safety accident. If the metal debris accumulates at the bottom of the oil tank, it may form a bridge under the action of electromagnetic force, connecting the lower yoke of the core with the foot pad or the tank bottom, thereby violating the one-point grounding principle of the core and forming multi-point grounding, increasing the eddy current loss of the core, causing local overheating of the core, and affecting the normal operation of the transformer. When the metal debris flows with the oil in the tank, it may cause the oil flow to form irregular eddies in some areas, affecting the oil's ability to carry heat outward, causing severe local aging of the oil, reducing the cooling effect inside the transformer, and further affecting the overall performance and lifespan of the transformer. SUMMARY

[0005] In view of the deficiencies of the prior art, the application provides a three-dimensional wound core oil-immersed intelligent power transformer and method, which prolongs the path through a continuous V-shaped triangular slide, the tip of the triangular slide is in contact with a rolling ball, and the adsorption groove fully captures the suspended iron filings in the oil, thereby improving the adsorption efficiency; the rolling ball is lowered at a regular time, the slide adsorbs the iron filings, and the bottom cylinder collects, forming a full closed loop process, which is convenient for cleaning; the material control device realizes the regular separate lowering of the inner adsorbed iron filings rolling ball, which is convenient for automatic control.

[0006] Technical scheme: In order to achieve the above object, the application is implemented by the following technical scheme: a three-dimensional wound core oil-immersed intelligent power transformer, comprising: a material control device, the bottom of the material control device is connected with the top of the shell, a plurality of material control devices are distributed equidistantly along the circumferential direction of the inscribed circle of the shell, each material control device is used for controlling the communication or closure of the bottom of the cylinder and the top of the hole and making the inner adsorbed iron filings rolling ball fall to the triangular conveying rail device, the triangular conveying rail device is arranged between the shell and the winding, the triangular conveying rail device is used for guiding the inner adsorbed iron filings rolling ball to roll along a predetermined route under the action of its own gravity and collect the metal filings in the liquid, the bottom of the shell is provided with a plurality of discharge devices, each discharge device is matched with the bottom of one triangular conveying rail device, and the discharge device is used for receiving the inner adsorbed iron filings rolling ball rolled by the triangular conveying rail device.

[0007] Preferably, the top of the shell is provided with a plurality of holes, the top of each hole is connected with one material control device, the directly below of each hole is provided with one triangular conveying rail device, a gap is arranged between the shell and the winding, and the triangular conveying rail device is arranged in the gap.

[0008] Preferably, the material control device comprises: a cylinder, the bottom of the cylinder is in communication with the top of the hole, a plurality of inner adsorbed iron filings rolling balls are equidistantly arranged in the cylinder in the vertical direction, the side surface of the cylinder is provided with a first moving hole and a second moving hole, the first moving hole is located above the second moving hole, the side of the first moving hole is connected with a first horizontal box, the side of the second moving hole is connected with a second horizontal box, the other side of the first moving hole and the other side of the second moving hole are both connected with a main box, the top wall of the main box is provided with a sliding groove, the inner wall of the side of the main box is fixedly connected with a first hydraulic cylinder, the telescopic end of the first hydraulic cylinder is connected with a connecting plate, the two ends of the connecting plate are respectively connected with a first moving plate and a second moving plate, the first moving plate is located above the second moving plate, the upper surface of the end of the first moving plate close to the connecting plate is provided with a falling hole, the first moving plate is slidably connected with the sliding groove, the falling hole is matched with the inner diameter of the cylinder, and the inner diameter of the cylinder is not less than the diameter of the inner adsorbed iron filings rolling ball.

[0009] Preferably, the telescopic end of the first hydraulic cylinder simultaneously drives the first moving plate and the second moving plate, when the second moving plate seals the second moving hole, the falling hole on the first moving plate is in communication with the first moving hole, when the second moving plate is completely communicated with the second moving hole, the first moving plate seals the first moving hole.

[0010] Preferably, each of the triangular track devices includes: a guide plate, the top of which is fixedly connected to the top wall of the housing; there are three guide plates in total; each guide plate has an arc surface on its inner side; each guide plate is connected to a slanted straight plate through the arc plate; each slanted straight plate is fixedly connected to another slanted straight plate below it through an angle plate; several slanted straight plates and several angle plates form a continuous V-shaped channel; the angle between the slanted straight plate and the horizontal plane is 14-31°.

[0011] Preferably, the projections of one end of the inclined straight plate, one end of the corner plate, and one end of the arc plate are all isosceles triangles, and the tips of the inclined straight plate, the corner plate, and the arc plate all face inward and are connected to the internally attached chip-collecting rollers.

[0012] Preferably, each of the three inclined straight plates of the triangular track device is provided with an inclined channel between the three corner plates, a corner channel between the three arc plates, and an arc-shaped channel between the three arc plates. The inclined channel, corner channel, and arc-shaped channel form a triangular slide. The triangular slide is adapted to the internal dust-collecting roller. The internal dust-collecting roller rolls downward along the triangular slide. The distance between the three guide plates at the top of each triangular track device gradually decreases along the direction of the virtual straight line. The distance between the top of the three guide plates is less than the distance between the bottom of the three guide plates.

[0013] Preferably, the surface of the inner dust-collecting roller is provided with several adsorption grooves at equal intervals along the circumference. Each adsorption groove has a port at the upper part of both ends. One end of the port passes through the inner dust-collecting roller and extends to the outside of the inner dust-collecting roller. The inner wall of the lower part of the adsorption groove is sprayed with a magnetic coating. The magnetic coating is a resin-based ferrite composite coating composed of epoxy resin and nano-sized manganese zinc ferrite powder. The thickness of the magnetic coating is 0.1-0.3 mm.

[0014] Preferably, the discharge device includes: a box body, which is fixedly connected to one side of the shell, a second hydraulic cylinder is connected to the inner wall of the shell, a circular hole is opened through the side of the shell, a discharge port is opened through the bottom wall of the shell, the discharge port is located directly below the bottom outlet of the triangular conveyor device, a baffle is fixedly connected to the outer edge of the top of the discharge port, an insertion hole is opened on the inner wall of the bottom wall of the shell, the insertion hole is connected to the discharge port, the insertion hole is connected to the circular hole, a sealing plate is slidably connected to the insertion hole, a piston rod is connected to the telescopic end of the second hydraulic cylinder, one end of the piston rod is fixedly connected to the sealing plate, the sealing plate is used to control the opening and closing of the discharge port, a threaded hole is opened on the inner wall of the bottom of the discharge port, and a bottom cylinder is threadedly connected to the threaded hole.

[0015] A method for using a three-dimensional wound core oil-immersed intelligent power transformer is disclosed. The transformer is applied to a three-dimensional wound core oil-immersed intelligent power transformer. A second shifting hole is opened at predetermined time intervals, and a first shifting plate seals the first shifting hole. An internal chip-absorbing roller falls from the second shifting hole onto a triangular conveyor device. The triangular conveyor device is equipped with a triangular slide. The internal chip-absorbing roller rolls downwards along a continuous V-shaped triangular slide, extending the moving distance of the internal chip-absorbing roller. The tip of the triangular slide contacts the internal chip-absorbing roller, reducing the contact area and resistance between the internal chip-absorbing roller and the slide. During the rolling process, iron filings in the liquid are collected into the adsorption tank through magnetic attraction. After adsorbing the iron filings, the internal chip-absorbing roller falls into the bottom cylinder through the discharge port and is cleaned.

[0016] Beneficial Effects: This invention provides a three-dimensional wound core oil-immersed intelligent power transformer and method. Compared with the prior art, it has the following beneficial effects: 1. The continuous V-shaped triangular slide extends the path, enhancing the adsorption effect of iron filings. At the same time, the tip of the triangular slide contacts the rolling ball, reducing the contact area and rolling resistance. The adsorption tank fully captures suspended iron filings in the oil, improving adsorption efficiency. The rolling ball is released at timed intervals, the slide adsorbs iron filings, and the bottom cylinder collects them, forming a closed-loop process that facilitates cleaning. The second moving hole is opened at predetermined time intervals, and the first moving plate seals the first moving hole, enabling the internal iron filings-absorbing rolling ball to be released at timed intervals and directionally enter the triangular conveyor rail. Only one internal iron filings-absorbing rolling ball falls onto the triangular conveyor rail at a time, eliminating the need for frequent manual judgment of the release timing. This high degree of automation ensures that iron filings are captured in a timely manner, preventing the accumulation of iron filings in the oil and causing insulation hazards.

[0017] 2. The inner arc surface of the guide plate fits against the rolling ball, guiding it into the arc-shaped channel to ensure full contact between the ball and the oil, laying the foundation for iron filings adsorption and adapting to the natural circulation of oil within the transformer. The arc-shaped channel provides a transition buffer, the corner channel smoothly reverses direction, and the inclined channel provides uniform speed guidance. These three elements form a triangular slide adapted to the rolling ball. The continuous V-shaped structure extends the movement path of the rolling ball, and the angled design balances gravity and oil resistance, allowing the rolling ball to roll at a uniform speed of 5-10cm / s, extending the contact time between the adsorption tank and the oil, and improving the iron filings capture rate. The tips of the inclined straight plate, corner plate, and arc plate all face inward and connect with the rolling ball, reducing the contact area and significantly reducing rolling resistance and wear. At the same time, it avoids the generation of new debris from large-area friction between the rolling ball and the triangular slide, protecting the integrity of the magnetic coating on the surface of the rolling ball, extending the service life of the rolling ball, and the stable triangular structure prevents the rolling ball from shifting or getting stuck, ensuring a continuous and reliable adsorption process.

[0018] 3. The angle between the inclined plate and the horizontal plane is 14-31°. At this angle, the gravitational component of the rolling ball and the viscous resistance of the oil are balanced, which can prevent the oil from staying in the adsorption tank for too long and causing impurities to accumulate. At the same time, the faster rolling speed allows the adsorption tank to fully contact the oil flow and capture dispersed iron filings. The isosceles triangular projection structure of the inclined channel ensures that the rolling ball always rolls along the center of the channel. The surface adsorption tank can evenly contact the oil on both sides of the channel. Even if the oil flow fluctuates, the rolling ball will not deviate and cause the adsorption tank on one side to fail, ensuring adsorption without dead corners throughout the process.

[0019] 4. When the first hydraulic cylinder is closed, the first moving plate seals the first moving hole, separating the upper part of the cylinder from the shell, preventing the mixing of oil in the two areas and the diffusion of impurities; the second moving plate is pulled out to open the second moving hole, allowing only the ball to pass through, without affecting the oil seal, and there is no need to drain the oil throughout the process, resulting in low oil loss. When the hydraulic cylinder is closed, the first moving plate locks the ball in the upper part of the cylinder, preventing it from accidentally falling and impacting, generating new debris or blocking the channel; after the hydraulic cylinder is started and reset, the first moving hole connects with the falling hole, and the ball falls smoothly. The second moving plate promptly seals the second moving hole and supports the ball. The surface contact design significantly reduces impact force, protects the magnetic coating of the ball, and extends its service life. Moreover, the hydraulic cylinder drive ensures accurate action without misalignment or jamming. By simply closing / starting the first hydraulic cylinder, the movement of the moving plate, the opening and closing of the hole, and the control of the ball can be completed simultaneously without complex disassembly; the entire process has strong linkage, and operators do not need to have in-depth knowledge of the internal structure, simplifying the operation process and shortening maintenance time. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present application and, together with the specification, further serve to explain the principles of the present application and enable those skilled in the art to implement and use the present application.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a cross-sectional view of the present invention.

[0024] Figure 3 This is a diagram showing the separation between the shell and its interior.

[0025] Figure 4 This is a schematic diagram of the material control device, the triangular conveyor device, and the discharge device.

[0026] Figure 5 This is a schematic diagram of the material control device.

[0027] Figure 6 This is an exploded view of the material control device.

[0028] Figure 7 This is a structural diagram of the main box and the slide.

[0029] Figure 8 This is a schematic diagram of the triangular track-moving device.

[0030] Figure 9 This is a schematic diagram of the top structure of the triangular track-moving device.

[0031] Figure 10 for Figure 9 Schematic diagram of the structure of the guide plate, the arc plate, the inclined straight plate, and the arc surface.

[0032] Figure 11 This is a schematic diagram of the structure with internal dust-collecting rollers and adsorption tanks.

[0033] Figure 12 This is a cross-sectional view of the internal dust-collecting rollers.

[0034] Figure 13 This is a top view of the internal dust-collecting rollers.

[0035] Figure 14 This is a schematic diagram of the discharge device.

[0036] The reference numerals in the figure are as follows: 11. Shell; 12. Winding; 13. Gap; 14. Channel; 2. Material control device; 21. Cylinder; 22. First horizontal box; 23. Second horizontal box; 24. Main box; 25. First hydraulic cylinder; 26. Connecting plate; 27. First moving plate; 28. Second moving plate; 29. ​​Drop hole; 3. Triangular rail device; 31. Guide plate; 32. Arc plate; 33. Inclined straight plate; 34. 35. Angle plate; 36. Triangular slide; 4. Arc surface; 4. Discharge device; 41. Box body; 42. Baffle; 43. Bottom cylinder; 44. Second hydraulic cylinder; 45. Piston rod; 46. Sealing insert plate; 47. Insertion hole; 48. Threaded hole; 49. Discharge port; 51. First shifting hole; 52. Second shifting hole; 53. Slide groove; 54. Round hole; 61. Internal dust-collecting roller; 62. Adsorption tank; 63. Port.

[0037] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] like Figure 1 - Figure 14 As shown, the present invention provides a three-dimensional wound core oil-immersed intelligent power transformer, comprising: a material control device 2, the bottom of which is connected to the top of the shell 11; several material control devices 2 are equidistantly distributed along the circumferential direction of the outer tangent circle of the shell 11; each material control device 2 is used to control the connection or closure between the bottom of the cylinder 21 and the top of the channel 14 and to cause the inner attached chip-absorbing roller 61 to fall onto the triangular track device 3; the triangular track device 3 is disposed between the shell 11 and the winding 12; the triangular track device 3 is used to guide the inner attached chip-absorbing roller 61 to roll along a predetermined route under its own weight and collect metal chips in the liquid; several discharge devices 4 are provided at the bottom of the shell 11; each discharge device 4 is adapted to the bottom of a triangular track device 3; the discharge device 4 is used to receive the inner attached chip-absorbing roller 61 that rolls off the triangular track device 3.

[0040] The top of the housing 11 has several through holes 14. Each hole 14 is connected to a material control device 2 at the top. A triangular track device 3 is provided directly below each hole 14. A gap 13 is provided between the housing 11 and the winding 12. The triangular track device 3 is located in the gap 13.

[0041] The material control device 2 includes: a cylinder 21, the bottom of which is connected to the top of the channel 14; several internally attached chip-collecting rollers 61 are equidistantly placed vertically inside the cylinder 21; a first shifting hole 51 and a second shifting hole 52 are provided through the side of the cylinder 21; the first shifting hole 51 is located above the second shifting hole 52; one side of the first shifting hole 51 is connected to a first horizontal box 22; one side of the second shifting hole 52 is connected to a second horizontal box 23; the other side of both the first shifting hole 51 and the second shifting hole 52 are connected to a main box 24; the main box 24... A sliding groove is provided on the top wall. A first hydraulic cylinder 25 is fixedly connected to the inner wall of one side of the main box 24. A connecting plate 26 is connected to the telescopic end of the first hydraulic cylinder 25. A first moving plate 27 and a second moving plate 28 are respectively connected to both ends of the connecting plate 26. The first moving plate 27 is located above the second moving plate 28. A drop hole 29 is provided through the upper surface of the first moving plate 27 near the connecting plate 26. The first moving plate 27 is slidably connected to the sliding groove. The drop hole 29 is adapted to the inner diameter of the cylinder 21. The inner diameter of the cylinder 21 is not less than the diameter of the internally attached chip-collecting roller 61.

[0042] The first moving plate 27 and the second moving plate 28 are simultaneously driven by the extension and retraction end of the first hydraulic cylinder 25. When the second moving plate 28 seals the second moving hole 52, the falling hole 29 on the first moving plate 27 is connected to the first moving hole 51. When the second moving plate 28 is fully connected to the second moving hole 52, the first moving plate 27 seals the first moving hole 51.

[0043] Each triangular track device 3 includes: a guide plate 31, the top of which is fixedly connected to the top wall of the housing 11. There are three guide plates 31 in total. Each guide plate 31 has an arc surface 36 on its inner side. Each guide plate 31 is connected to a straight inclined plate 33 through an arc plate 32. Each straight inclined plate 33 is fixedly connected to another straight inclined plate 33 below it through an angle plate 34. Several straight inclined plates 33 and several angle plates 34 form a continuous V-shaped channel. The angle between the straight inclined plate 33 and the horizontal plane is 14-31°.

[0044] The tilt angle of the inclined plate 33 directly determines the sliding speed of the iron ball. When the angle is less than 14°, the iron ball may slide slowly or even stop due to the viscous resistance of the insulating oil, leading to local accumulation of iron filings. When the angle is greater than 31°, the iron ball slides too fast, shortening the contact time with the insulating oil, and the magnetic coating cannot fully adsorb the suspended iron filings in the oil, reducing the purification efficiency. When the tilt angle of the inclined plate 33 is within the range of 14°-31°, the sliding speed of the iron ball is approximately 5-10 cm / s, ensuring continuous flow while allowing each coating area to contact the oil. The adsorption iron balls typically used in transformers are 30-45 mm in diameter and weigh between 60-190 g. An angle of 14°-31° can match the gravitational component of the iron ball of this specification to balance the oil resistance. The gravitational component along the inclined plane is sufficient to overcome the viscous resistance of the insulating oil, ensuring that the iron ball does not get stuck. At the same time, the component force will not be too large, avoiding the iron ball from hitting the end of the inclined plate 33 or the wall of the cylinder 21, generating new metal debris. It can also avoid the oil flow disturbance affecting the natural circulation of the insulating oil inside the transformer (hot oil rises, cold oil sinks). If the inclined plate 33 is tilted at too large an angle, the iron ball may disturb the local oil flow direction when sliding, and even affect the heat dissipation efficiency of the transformer body. The gentle angle of 14°-31° has the least disturbance to the oil flow, is compatible with the natural circulation direction of the oil, and does not interfere with the normal heat dissipation of the transformer.

[0045] The projections of one end of the inclined straight plate 33, one end of the corner plate 34, and one end of the arc plate 32 are all isosceles triangles. The tips of the inclined straight plate 33, the corner plate 34, and the arc plate 32 all face inward and are connected to the internally attached chip-collecting roller 61.

[0046] Each triangular track device 3 has an inclined channel between its three inclined straight plates 33, a corner channel between its three corner plates 34, and an arc-shaped channel between its three arc plates 32. The inclined channel, corner channel, and arc-shaped channel together form a triangular slide 5335. The triangular slide 5335 is adapted to the internally attached dust-collecting roller 61. The internally attached dust-collecting roller 61 rolls downward along the triangular slide 5335. The distance between the three guide plates 31 at the top of each triangular track device 3 gradually decreases along the direction of the virtual straight line. The distance between the tops of the three guide plates 31 is less than the distance between the bottoms of the three guide plates 31.

[0047] The surface of the inner dust-collecting roller 61 is provided with several adsorption grooves 62 at equal intervals along the circumference. Each adsorption groove 62 has a port 63 at the upper part of both ends. One end of the port 63 passes through the inner dust-collecting roller 61 and extends to the outside of the inner dust-collecting roller 61. The inner wall of the lower part of the adsorption groove 62 is sprayed with a magnetic coating. The magnetic coating is a resin-based ferrite composite coating composed of epoxy resin and nano-sized manganese zinc ferrite powder. The thickness of the magnetic coating is 0.1-0.3mm.

[0048] The ports 63 at both ends of the adsorption tank 62 penetrate the rolling ball, allowing the insulating oil to flow actively through the tank. During transformer operation, the oil enters the adsorption tank 62 through the ports 63, making full contact with the magnetic coating in the lower middle section. Compared to the smooth surface of the rolling ball, this significantly increases the contact area between the oil and the magnetic material, preventing adsorption blind spots caused by oil circling around. Nanoparticles enhance the magnetic permeability of the magnetic coating, resulting in stronger adsorption of tiny iron filings. The manganese-zinc ferrite is a weakly magnetic material; during subsequent cleaning, only a strong external magnet is needed to easily remove the iron filings, preventing them from sticking due to residual magnetism in the coating, facilitating reuse. The epoxy resin-based coating is completely compatible with transformer insulating oil and insulating paper, and will not dissolve or release impurities during long-term immersion, nor will it corrode the rolling ball itself. The 0.1-0.3mm thin coating adheres tightly to the inner wall of the adsorption tank 62 without protrusions or gaps, preventing the formation of localized high field strength under the influence of an electric field, thus eliminating the risk of partial discharge at its source. The magnetic coating is directly sprayed into the adsorption tank 62 without the need for additional fasteners. This prevents the coating from peeling off or the fasteners from loosening due to transformer vibration, thus avoiding contamination of the insulating oil and preventing secondary faults such as short circuits in winding 12 caused by component detachment. Both epoxy resin and manganese-zinc ferrite can withstand the oil temperature required for normal transformer operation and are chemically stable in the insulating oil, preventing aging and degradation. Their service life is compatible with that of the transformer body.

[0049] The oil flow disturbance during transformer operation will cause the ball to roll slightly. On the one hand, this allows different areas of the adsorption tank 62 to come into contact with the oil in turn, avoiding saturation of a single area. On the other hand, during the rolling process, unadsorbed impurities will be discharged with the oil flow, reducing the accumulation of impurities in the adsorption tank 62 and reducing the maintenance frequency.

[0050] The discharge device 4 includes: a box body 41, which is fixedly connected to one side of the housing 11. A second hydraulic cylinder 44 is connected to the inner wall of the housing 11. A circular hole 54 is opened through the side of the housing 11. A discharge port 49 is opened through the bottom wall of the housing 11. The discharge port 49 is located directly below the bottom outlet of the triangular conveyor device 3. A baffle 42 is fixedly connected to the outer edge of the top of the discharge port 49. An insertion hole 47 is opened on the inner wall of the bottom wall of the housing 11. The insertion hole 47 is connected to the discharge port 49 and the circular hole 54. A sealing insert plate 46 is slidably connected to the insertion hole 47. A piston rod 45 is connected to the telescopic end of the second hydraulic cylinder 44. One end of the piston rod 45 is fixedly connected to the sealing insert plate 46. The sealing insert plate 46 is used to control the opening and closing of the discharge port 49. A threaded hole 48 is opened on the inner wall of the bottom of the discharge port 49. A bottom cylinder 43 is threadedly connected to the threaded hole 48.

[0051] A method for using a three-dimensional wound core oil-immersed intelligent power transformer is disclosed. In this method, a second shifting hole 52 is opened at predetermined time intervals, and a first shifting plate 27 seals the first shifting hole 51. An internal chip-absorbing roller 61 falls from the second shifting hole 52 onto a triangular conveyor device 3. The triangular conveyor device 3 is equipped with a triangular slide 5335. The internal chip-absorbing roller 61 rolls downwards along the continuous V-shaped triangular slide 5335, extending the moving distance of the internal chip-absorbing roller 61. The tip of the triangular slide 5335 contacts the internal chip-absorbing roller 61, reducing the contact area and resistance between the internal chip-absorbing roller 61 and the triangular slide 5335. During the rolling process, iron filings in the liquid are collected into an adsorption tank 62 through magnetic attraction. After adsorbing the iron filings, the internal chip-absorbing roller 61 falls into the bottom cylinder 43 through the discharge port 49 and is cleaned.

[0052] During use, the iron filings in the transformer oil can be cleaned every half month. The cleaning frequency can also be adjusted according to the actual use of the transformer. During cleaning, the first hydraulic cylinder 25 is closed. The telescopic end of the first hydraulic cylinder 25 moves the connecting plate 26, the first moving plate 27, and the second moving plate 28 toward the main box 24. The second moving plate 28 is pulled out from the second horizontal box 23. The second moving plate 28 no longer seals the second moving hole 52, and the second moving hole 52 is fully opened. At the same time, the falling hole 29 of the first moving plate 27 is misaligned and separated from the first moving hole 51. The first moving plate 27 continues to move and completely seals the first moving hole 51. The internal dust-collecting roller 61 inside the cylinder 21 cannot fall to the bottom of the cylinder 21 and separates the upper part of the cylinder 21 from the inside of the shell 11. The first hydraulic cylinder 25 is activated, and the telescopic end of the first hydraulic cylinder 25 moves the first moving plate 27 and the second moving plate 28 to the starting position. The second moving plate 28 completely seals the second moving hole 52. The falling hole 29 on the first moving plate 27 is completely connected to the first moving hole 51. The internal chip-collecting roller 61 in the middle of the cylinder 21 falls to the bottom of the cylinder 21 through the first moving hole 51. The second moving plate 28 supports the internal chip-collecting roller 61.

[0053] The internally attached chip-collecting roller 61 falls to the top of the triangular conveyor device 3 after passing through the first shifting hole 51 and the channel 14. Initially, the internally attached chip-collecting roller 61 is located at the entrance of the arc-shaped channel at the top of the triangular slide rail 5335. The thrust of the oil flow and the component of the roller's own weight along the slide rail 53 work together to push the roller to begin rolling along the arc-shaped channel. The arc surface 36 on the inner side of the guide plate 31 fits against the surface of the roller, which not only limits the lateral displacement of the roller but also reduces the oil flow resistance, allowing the roller to enter the arc-shaped channel at a stable speed.

[0054] The arc-shaped channel composed of three arc plates 32 has an isosceles triangle projection with its apex pointing inwards, perfectly matching the arc-shaped contour of the rolling ball surface. As the ball rolls, its surface maintains slight contact with the inner wall of the arc plates 32. During this stage, the oil enters the arc-shaped channel along with the rolling ball. The adsorption grooves 62 on the surface of the rolling ball actively capture the oil through the two end ports 63. As the oil flows through the adsorption grooves 62, the magnetic coating in the lower middle part generates a magnetic field, firmly adsorbing the suspended iron filings in the oil onto the coating surface. Due to the curved trajectory of the arc-shaped channel, the rolling ball rolls at a slower speed, extending the residence time of the oil in the adsorption grooves 62 to 1-2 seconds, thus improving the initial adsorption efficiency. After the rolling ball exits the arc-shaped channel, it enters the corner channel composed of three corner plates 34. The corner plates 34 also have an isosceles triangle projection with their apex pointing inwards and are connected to the rolling ball. Their function is to smoothly change the rolling direction of the ball from an arc-shaped downward motion to a tilted downward motion, preventing the rolling ball from colliding due to a sudden change in direction and preventing the generation of new metal fragments. The corner channel has a compact spatial structure, where the oil forms a brief vortex. Iron filings not adsorbed by the curved channel are mostly particles that have temporarily escaped the magnetic field due to oil flow disturbance and will remain here. When the ball passes by, the port 63, which was originally facing upwards, becomes lateral due to the change in direction. The other port 63 of the adsorption tank 62 comes into contact with the oil vortex again, and the magnetic coating adsorbs the retained iron filings a second time, further improving the iron filings capture rate. At the same time, the isosceles triangular structure of the corner plate 34 can guide the oil to be evenly distributed on the surface of the ball, avoiding local oil accumulation that would cause adsorption blind spots.

[0055] After the rolling ball enters the inclined channel composed of three inclined straight plates 33, it officially enters the stage of uniform rolling and deep adsorption. The angle between the inclined straight plates 33 and the horizontal plane is 14-31°. At this angle, the gravitational component of the rolling ball and the viscous resistance of the oil are balanced. When the angle is 14-20°, it is suitable for high viscosity insulating oil or low temperature environment. The rolling ball speed is about 5cm / s, and the adsorption tank 62 has enough time to contact the oil, which is suitable for deep adsorption of iron filings with high density in the oil. When the angle is 21-31°, it is suitable for low viscosity insulating oil or high temperature environment. The rolling ball speed is increased to 8-10cm / s, which can avoid the oil from staying in the adsorption tank 62 for too long and causing impurities to accumulate. At the same time, the faster rolling speed allows the adsorption tank 62 to fully contact the oil flow and capture dispersed iron filings. The isosceles triangular projection structure of the inclined channel ensures that the ball always rolls along the center of the channel, and the surface adsorption groove 62 can evenly contact the oil on both sides of the channel. Even if the oil flow fluctuates, the ball will not cause the adsorption groove 62 on one side to fail due to deviation, ensuring adsorption without dead angles throughout the process.

[0056] The internal dust-collecting roller 61 has rolled to the bottom outlet of the triangular conveying device 3. The outlet is directly opposite the discharge port 49 on the bottom wall of the housing 11. A baffle 42 is fixedly connected to the top outer edge of the discharge port 49. The baffle 42 can block the surrounding oil or impurities from entering the discharge port 49, and at the same time, it plays a positioning and guiding role for the roller, ensuring that the roller is aligned with the discharge port 49 and avoiding deviation and jamming.

[0057] When the discharge device 4 is in its initial state, the sealing plate 46, under the contraction action of the second hydraulic cylinder 44, is fully inserted into the insertion hole 47 on the bottom wall of the housing 11, and the top surface of the sealing plate 46 is flush with the inner wall of the bottom wall of the housing 11, completely sealing the discharge port 49. This state ensures that the oil will not leak from the discharge port 49 when the transformer is operating normally, and at the same time prevents impurities from entering the interior of the housing 11. When it is necessary to clean the rolling balls, the second hydraulic cylinder 44 is activated. The telescopic end of the second hydraulic cylinder 44 pushes the piston rod 45 to move horizontally. Since one end of the piston rod 45 is fixedly connected to the sealing plate 46, the sealing plate 46 slides synchronously along the insertion hole 47 with the piston rod 45. As the sealing plate 46 is gradually pulled out from below the discharge port 49, the communication channel between the insertion hole 47 and the discharge port 49 is opened, releasing the blocking state of the discharge port 49 and forming a vertical falling channel from the bottom outlet of the triangular conveyor device 3 to the discharge port 49.

[0058] An oil-resistant sealing ring can be installed on the inner wall of the insertion hole 47 to prevent oil leakage from the gap 13 between the insertion hole 47 and the sealing plate 46 during the sliding process of the sealing plate 46. When the piston rod 45 passes through the round hole 54 on the side of the housing 11, a lip seal ring also needs to be installed at the round hole 54 to prevent the oil inside the housing 11 from leaking out through the round hole 54, ensuring that there is no loss or contamination of oil during operation.

[0059] When the sealing plate 46 is fully opened, the internal dust-collecting roller 61, under its own weight, detaches from the bottom outlet of the triangular conveyor device 3 and falls vertically along the area guided by the baffle 42, smoothly passing through the discharge port 49. Since the discharge port 49 and the bottom cylinder 43 are threadedly connected through the threaded hole 48, the top opening of the bottom cylinder 43 is completely aligned with the discharge port 49. The roller falls without obstruction and can fall directly into the bottom cylinder 43. The volume of the bottom cylinder 43 must be adapted to the size of the internal dust-collecting roller 61 to ensure that the roller can fall smoothly.

[0060] After the ball has completely fallen into the bottom cylinder 43, the second hydraulic cylinder 44 is closed, causing the piston rod 45 to reset the sealing plate 46, resealing the discharge port 49 to prevent leakage of residual oil inside the housing 11. Then, the operator can unscrew the bottom cylinder 43 from the bottom of the housing 11 to remove it. During disassembly, a small amount of insulating oil may remain inside the bottom cylinder 43; an oil collection container should be placed under the bottom cylinder 43 to prevent oil dripping and environmental pollution. Additionally, the outer wall of the bottom cylinder 43 can be textured with anti-slip grooves to facilitate gripping and unscrewing, improving disassembly convenience.

[0061] Transfer the disassembled bottom cylinder 43 to the designated cleaning area, open the top of the bottom cylinder 43 or tilt it directly, and remove the internal chip-absorbing roller 61. Use a strong magnetic rod close to the surface of the adsorption tank 62, and use the strong magnetic attraction to peel the iron filings off the magnetic coating. Collect the peeled iron filings for processing. If the iron filings are tightly bonded to the magnetic coating, the adsorption tank 62 can be rinsed with clean transformer oil. The flow of oil will wash the iron filings off. The rinsed oil can be filtered and recycled after rinsing.

[0062] After cleaning, check the magnetic coating of the internal dust-collecting roller 61 for integrity. If the coating is worn or peeled off, a new epoxy resin and nano-manganese-zinc ferrite composite coating needs to be sprayed to ensure adsorption performance. Then, the roller can be put back into the cylinder 21 for reuse, saving costs. Reinstall the bottom cylinder 43 back into the discharge port 49 on the bottom wall of the shell 11 through the threaded hole 48 to complete the entire cleaning process.

[0063] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A three-dimensional wound-core oil-immersed intelligent power transformer, characterized in that, include: Material control device (2), the bottom of the material control device (2) is connected to the top of the shell (11), several material control devices (2) are distributed at equal intervals in the circumferential direction of the outer tangent circle of the shell (11), each material control device (2) is used to control the connection or closure between the bottom of the cylinder (21) and the top of the channel (14) and to make the inner attached chip-absorbing ball (61) fall to the triangular track device (3), the triangular track device (3) is set between the shell (11) and the winding (12), the triangular track device (3) is used to guide the inner attached chip-absorbing ball (61) to roll along a predetermined route under its own gravity and collect metal chips in the liquid, several discharge devices (4) are set at the bottom of the shell (11), each discharge device (4) is adapted to the bottom of a triangular track device (3), the discharge device (4) is used to receive the inner attached chip-absorbing ball (61) that rolls down from the triangular track device (3).

2. The three-dimensional wound core oil-immersed intelligent power transformer according to claim 1, characterized in that, The top of the housing (11) is provided with several channels (14), and the top of each channel (14) is connected to a material control device (2). A triangular track device (3) is provided directly below each channel (14). A gap (13) is provided between the housing (11) and the winding (12), and the triangular track device (3) is provided in the gap (13).

3. A three-dimensional wound-core oil-immersed intelligent power transformer according to claim 2, characterized in that, The material control device (2) includes: a cylinder (21), the bottom of which is connected to the top of the channel (14), and several internally attached chip-absorbing rollers (61) are placed equidistantly in the cylinder (21) in the vertical direction. A first shifting hole (51) and a second shifting hole (52) are provided through the side of the cylinder (21). The first shifting hole (51) is located above the second shifting hole (52). One side of the first shifting hole (51) is connected to a first horizontal box (22), and one side of the second shifting hole (52) is connected to a second horizontal box (23). The other side of the first shifting hole (51) and the other side of the second shifting hole (52) are both connected to a main box (24). A groove (53) is provided on the top wall. A first hydraulic cylinder (25) is fixedly connected to the inner wall of one side of the main box (24). A connecting plate (26) is connected to the telescopic end of the first hydraulic cylinder (25). A first moving plate (27) and a second moving plate (28) are respectively connected to both ends of the connecting plate (26). The first moving plate (27) is located above the second moving plate (28). A drop hole (29) is provided through the upper surface of the first moving plate (27) near the end of the connecting plate (26). The first moving plate (27) is slidably connected to the groove (53). The drop hole (29) is adapted to the inner diameter of the cylinder (21). The inner diameter of the cylinder (21) is not less than the diameter of the internal dust-collecting roller (61).

4. A three-dimensional wound core oil-immersed intelligent power transformer according to claim 3, characterized in that: The first moving plate (27) and the second moving plate (28) are simultaneously driven by the telescopic end of the first hydraulic cylinder (25). When the second moving plate (28) seals the second moving hole (52), the falling hole (29) on the first moving plate (27) is connected to the first moving hole (51). When the second moving plate (28) is fully connected to the second moving hole (52), the first moving plate (27) seals the first moving hole (51).

5. A three-dimensional wound-core oil-immersed intelligent power transformer according to claim 4, characterized in that, Each of the triangular track devices (3) includes: a guide plate (31), the top of which is fixedly connected to the top wall of the housing (11). There are three guide plates (31). Each guide plate (31) has an arc surface (36) on its inner side. Each guide plate (31) is connected to a straight plate (33) through an arc plate (32). Each straight plate (33) is fixedly connected to another straight plate (33) below through an angle plate (34). Several straight plates (33) and several angle plates (34) form a continuous V-shaped channel. The angle between the straight plate (33) and the horizontal plane is 14-31°.

6. A three-dimensional wound core oil-immersed intelligent power transformer according to claim 5, characterized in that: The projections of one end of the inclined straight plate (33), one end of the corner plate (34), and one end of the arc plate (32) are all isosceles triangles. The tips of the inclined straight plate (33), the corner plate (34), and the arc plate (32) all face inward and are connected to the internal dust-collecting roller (61).

7. A three-dimensional wound core oil-immersed intelligent power transformer according to claim 6, characterized in that: Each of the three inclined straight plates (33) of the triangular track device (3) is provided with an inclined channel between the three corner plates (34) and an arc-shaped channel between the three arc plates (32). The inclined channel, the corner channel and the arc-shaped channel form a triangular slide (35). The triangular slide (35) is adapted to the internal dust-collecting roller (61). The internal dust-collecting roller (61) rolls down along the triangular slide (35). The distance between the three guide plates (31) at the top of each triangular track device (3) gradually shrinks along the direction of the virtual straight line. The distance between the top of the three guide plates (31) is less than the distance between the bottom of the three guide plates (31).

8. A three-dimensional wound core oil-immersed intelligent power transformer according to claim 7, characterized in that: The surface of the inner dust-absorbing roller (61) is provided with several adsorption grooves (62) at equal intervals along the circumference. Each adsorption groove (62) has a port (63) at the upper part of both ends. One end of the port (63) passes through the inner dust-absorbing roller (61) and extends to the outside of the inner dust-absorbing roller (61). The inner wall of the lower part of the adsorption groove (62) is sprayed with a magnetic coating. The magnetic coating is a resin-based ferrite composite coating composed of epoxy resin and nano-sized manganese zinc ferrite powder. The thickness of the magnetic coating is 0.1-0.3 mm.

9. A three-dimensional wound-core oil-immersed intelligent power transformer according to claim 8, characterized in that, The discharge device (4) includes: a box body (41), which is fixedly connected to one side of the shell (11). A second hydraulic cylinder (44) is connected to the inner wall of the shell (11). A circular hole (54) is opened through the side of the shell (11). A discharge port (49) is opened through the bottom wall of the shell (11). The discharge port (49) is located directly below the bottom outlet of the triangular conveyor device (3). A baffle (42) is fixedly connected to the outer edge of the top of the discharge port (49). An insertion hole is opened on the inner wall of the bottom wall of the shell (11). (47) The insertion hole (47) is connected to the discharge port (49), and the insertion hole (47) is connected to the round hole (54). The insertion hole (47) is slidably connected to the sealing plate (46). The extension end of the second hydraulic cylinder (44) is connected to the piston rod (45). One end of the piston rod (45) is fixedly connected to the sealing plate (46). The sealing plate (46) is used to control the opening and closing of the discharge port (49). The inner wall at the bottom of the discharge port (49) is provided with a threaded hole (48). The threaded hole (48) is threadedly connected to the bottom cylinder (43).

10. A method of using a three-dimensional wound core oil-immersed intelligent power transformer, applied to the three-dimensional wound core oil-immersed intelligent power transformer as described in claim 9, characterized in that: The second moving hole (52) is opened at a predetermined time interval. The first moving plate (27) seals the first moving hole (51). The inner chip-absorbing roller (61) falls from the second moving hole (52) to the triangular track device (3). The triangular track device (3) is equipped with a triangular slide (35). The inner chip-absorbing roller (61) rolls down along the continuous V-shaped triangular slide (35), extending the moving distance of the inner chip-absorbing roller (61). The tip of the triangular slide (35) contacts the inner chip-absorbing roller (61), reducing the contact area and resistance between the inner chip-absorbing roller (61) and the slide (53). During the rolling process, the iron filings in the liquid are collected into the adsorption tank (62) through magnetic attraction. After adsorbing the iron filings, the inner chip-absorbing roller (61) falls into the bottom cylinder (43) through the discharge port (49) and is cleaned.

Images