A large transformer and a protection assembly thereof

Abstract

The application belongs to the technical field of transformers, and particularly relates to a large transformer and a protection assembly thereof, which comprises a first protection assembly; the first protection assembly comprises a protection cylinder; a circular plate is slidably arranged in the protection cylinder; a sliding block is fixed to the outer ring of the circular plate; a cylinder is fixed to the bottom of the circular plate; a rubber cylinder is fixed to the bottom of the cylinder; a U-shaped plate is arranged on the left side of the inner ring of the cylinder; a rectangular plate is arranged on the right side of the inner ring of the cylinder; a sliding groove is formed in the circular plate, and two sliding plates are slidably arranged in the sliding groove; a first semicircular groove is formed in the opposite side of each of the two sliding plates; a threaded groove is formed on the two sides of the protection cylinder, and a machine screw is threadedly engaged in the threaded groove; a second protection assembly is mounted on the top of the protection cylinder; the protection assembly can ensure that the contact pressure between the wiring terminal and the pressure contact terminal is always stable, so that the occurrence of faults such as ablation of the connection and melting of the lead can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of transformer technology, specifically a large transformer and its protective components. Background Technology

[0002] Transformers are core equipment in power systems for energy conversion, transmission, and distribution. In the structural design of transformers, the energy transmission channel between the internal windings and the external power network is a crucial aspect of technical protection. The core structure of this channel consists of a conductive rod extending from the transformer windings through an insulating bushing to the outside of the equipment. A fixed terminal is pre-installed at the end of the conductive rod, and a dedicated crimp terminal is installed on the external busbar using a crimping process. Finally, the mechanical connection and electrical conduction between the terminal and the crimp terminal are achieved through bolt fastening. Currently, bolt crimping is commonly used for protection at this connection point to ensure the initial mechanical stability of the connection structure. However, in practical applications, existing protective measures are still insufficient to effectively address the challenges posed by external vibrations. The core issue is that external vibrations easily lead to loosening at the connection points. External vibrations originate from diverse and continuous sources, including mechanical vibrations from industrial equipment operation, wheel-rail impact vibrations at high-speed rail stations, and equipment vibrations caused by strong winds. These vibrations act continuously on the connection structure in the form of mechanical waves. Conventional protective methods such as double nuts can only withstand short-term, low-frequency vibrations. When faced with high-frequency, continuous external vibrations, their anti-loosening effect rapidly diminishes: vibration causes stress relaxation in the fastening bolts, gradually reducing the preload, which in turn leads to a continuous decrease in the contact pressure between the terminal block and the crimping terminal, eventually creating a noticeable gap, or even causing bolts to fall off and terminals to separate.

[0003] Loose connections can lead to a reduction in the contact area between terminals and an exponential increase in contact resistance. Under constant current, this can cause localized overheating. The high temperature further accelerates the oxidation of the terminal surface, creating a vicious cycle of loosening, overheating, oxidation, and increased resistance, ultimately leading to terminal ablation and lead wire melting. Secondly, the gaps created by loose connections can form a concentrated electric field under high voltage, causing arc discharge. The corrosive substances produced by the discharge can erode the surrounding insulation materials, and the high temperature of the arc can also ignite leaked insulating oil, causing a fire. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a power cable water penetration detection device. By setting up protective components, it can ensure that the contact pressure between the wiring terminal and the crimp terminal is always stable, thereby preventing faults such as burning at the connection and lead wire melting. The specific structure is as follows. A large transformer protection assembly includes a first protection assembly; the first protection assembly includes a casing, the top of which is closed and has a first inlet slot. A circular plate slides inside the protective sleeve, and the circular plate can slide completely out of the protective sleeve; a slider is fixed on the outer ring of the circular plate; a slide rail is opened on the inner ring of the protective sleeve, and the slider slides in the slide rail; A cylinder is fixed to the bottom of the circular plate; a rubber tube is fixed to the bottom of the cylinder, and the rubber tube has a multi-umbrella columnar structure; the rubber tube is used to be sleeved on the multi-umbrella columnar insulating sleeve at the top of the transformer. A conductive rod runs through the inside of the insulating sleeve; a terminal is installed on the top of the conductive rod, and the terminal is locked and fixed to the crimp terminal on the external busbar by bolts and nuts. A U-shaped plate is provided on the left side of the inner ring of the cylinder; a rectangular plate is provided on the right side of the inner ring of the cylinder; a groove is provided in the circular plate, and two sliding plates slide in the groove, with the total length of the sliding plates being less than the length of the groove; the sliding plates slide above the cylinder. Both of the two sliding plates have a first semi-circular groove on their opposite sides, and each of the first semi-circular grooves has a rubber layer inside; both of the two sliding plates have an inclined surface on their opposite sides. Two push plates are fixed at the top of the inner cavity of the cylinder, and the bottom of the push plates is arc-shaped, corresponding to the inclined surface on the slide plate; Both sides of the casing are provided with evenly arranged threaded grooves, and each threaded groove is threaded with an organic screw. A second protective component is installed on the top of the casing.

[0005] In a preferred embodiment of the present invention, a rectangular groove is formed in the inner wall of the cylinder on the opposite side of the U-shaped plate and the rectangular plate; a vertical plate is fixed in the rectangular groove. Each of the upright plates has a sliding push rod inside; the two push rods are respectively close to one side of the U-shaped plate or rectangular plate and are respectively fixed to the adjacent U-shaped plate or rectangular plate. A semicircular block is fixed on one side of each of the two push rods facing away from each other, and the semicircular block corresponds to the arc surface of the bottom of the push plate; a spring connects the semicircular block and the upright plate.

[0006] In a preferred embodiment of the present invention, the grommet screw is provided with an arc-shaped plate, and the arc-shaped plate is rotatably connected to the grommet screw; A guide rod is fixed on the arc-shaped plate; a through hole is opened above the nut screw, and the guide rod slides in the through hole; an arc-shaped groove is opened on the inner ring of the protective sleeve, and the arc-shaped plate is initially completely located in the arc-shaped groove; The inner diameter of the arc-shaped plate is the same as the inner diameter of the casing.

[0007] In a preferred embodiment of the present invention, vertical compartments are fixed on both sides of the protective sleeve, and the vertical compartments are rectangular; The vertical compartment has a vertical groove running through its middle section, dividing it into two parts; a circular groove is provided on the side of the vertical compartment facing the threaded groove, and the diameter of the circular groove is larger than the diameter of the grommet screw, and the width of the vertical groove is larger than the diameter of the guide rod. A baffle is inserted inside the vertical compartment.

[0008] In a preferred embodiment of the present invention, the baffle is provided with uniformly arranged cylindrical grooves, and the number of cylindrical grooves is the same as the number of circular grooves, and they correspond one-to-one. A circular block slides inside the cylindrical groove, and the circular block is connected to the cylindrical groove by a spring. In the initial state, the circular block partially extends out of the cylindrical groove.

[0009] In a preferred embodiment of the present invention, the second protective component includes a protective chamber; the protective chamber is fixed to the top of the protective cylinder. The top of the protective chamber is provided with a second cable inlet slot; a water flow sensor is installed on the right side of the second cable inlet slot inside the protective chamber. The protective chamber is equipped with two mirrored rotating belts, which are constrained into a triangle by three rotating rollers; a sponge layer is fixed to the outer ring of the rotating belts, and the opposite sides of the two sponge layers are attached to each other. The outer ring of the sponge layer has a groove, and the cross-section of the groove is semi-circular; and the diameter of the groove is the same as the diameter of the generatrix. Each of the three rollers in the conveyor belt has trapezoidal plates on both sides, and the rollers rotate on the trapezoidal plates, with one of the rollers being driven by a motor; Both sides of the two conveyor belts are provided with extrusion rollers, and the extrusion rollers rotate on the trapezoidal plate; the extrusion rollers intersect with the sponge layer; and the opposite sides of the two extrusion rollers are provided with drainage holes.

[0010] In a preferred embodiment of the present invention, the trapezoidal plate slides within the protective chamber; Each trapezoidal plate has a long rod on the side near the protective chamber, with one side of the long rod sliding inside the trapezoidal plate and the other side fixed to the protective chamber; a spring is sleeved on the long rod, and the spring is in a compressed state.

[0011] In a preferred embodiment of the present invention, trapezoidal blocks are provided below the two conveyor belts in a mirror-like arrangement; The two trapezoidal blocks have a second semicircular groove on one side of their opposite sides, and the second semicircular grooves fit together. Scrapers are fixed on the inclined surfaces of the two trapezoidal blocks, and the scrapers are semi-circular; grooves are formed on the scrapers.

[0012] In a preferred embodiment of the present invention, a bent pipe is fixed to the top of the protective compartment, and the opening of the bent pipe is inclined downward. Multiple short pipes are arranged in sequence at the opening of the bend, and the multiple short pipes are concentrically arranged and inclined downward. There is a gap between the multiple short tubes; adjacent short tubes are hinged by a pivot, and the multiple short tubes can swing left and right.

[0013] A large transformer includes a transformer; an insulating bushing is installed on the transformer; and the aforementioned large transformer protection components are installed on the insulating bushing.

[0014] The beneficial effects of this invention are as follows: 1. The large transformer and its protective components described in this invention, during installation, involve the casing moving downwards, causing the push plate to move downwards synchronously. The push plate, through the cooperation of the arc surface and the semi-circular block, drives the push rod to precisely clamp the bolt head and nut with the U-shaped plate and the rectangular plate, ensuring that the U-shaped plate and the rectangular plate always form a stable clamping limit on the bolt and nut. This structure can offset the impact of external vibrations on the bolts, prevent the bolts from experiencing stress relaxation due to vibration, and avoid a decrease in preload, thereby ensuring that the terminal and crimp terminal always maintain a stable contact pressure, thus preventing faults such as burn-out at the connection and lead wire melting. At the same time, during the downward movement of the push plate, two sliding plates are driven to move relative to each other, and the busbar is tightly locked and fixed through the first semi-circular groove with a rubber layer. This not only limits the radial and axial displacement of the busbar, but also absorbs the vibration of the busbar itself through the elastic buffer of the rubber layer, preventing the busbar vibration from being transmitted to the connection, further improving the vibration resistance stability of the terminal connection structure. If the busbar is blown by strong winds, the fixed busbar can prevent it from moving with the strong winds and pull on the crimp terminal.

[0015] The large transformer and its protective components described in this invention effectively block the corrosion of the connection between the terminals and the crimped terminals by natural environmental factors such as rainwater, dust, salt spray, and moisture due to the presence of the protective casing. The closed design of the top of the casing completely shields the connection between the busbar and the conductive rod, preventing direct contact with external environmental media. Simultaneously, two sliding plates on the circular plate clamp the busbar through a first semi-circular groove, with the rubber layer inside the semi-circular groove tightly adhering to the surface of the busbar. This not only fixes and limits the busbar but also seals the busbar insertion point, preventing dust and moisture from intruding through the inlet gap. This effectively prevents corrosion of metal components and aging of insulation materials, reduces the risk of surface flashover, and significantly improves the environmental adaptability and service life of the connection.

[0016] The large transformer and its protective components described in this invention utilize the rotation and adsorption of a sponge layer along the busbar to remove rainwater flowing down the busbar and block the seepage channels of rainwater to the connection points of the terminals and crimp terminals. The second semicircular groove of the trapezoidal block fits tightly with the busbar to form a secondary barrier, which, together with the scraper, removes residual moisture from the sponge layer, further preventing moisture residue and secondary contamination. This solves the problem of easy water seepage through the gaps in the busbar wiring in traditional protection methods, effectively preventing problems such as terminal oxidation and increased contact resistance caused by rainwater erosion. At the same time, due to the continuous compression force of the spring pushing the trapezoidal plates closer together, the sponge layer always fits tightly against the surface of the busbar. Even if the sponge layer is compressed and deformed due to long-term use, it can still maintain a close fit through the elastic compensation of the spring, avoiding rainwater residue due to gaps in the fit, which would cause rainwater to continue flowing downwards along the busbar. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a diagram showing the protective component of the present invention installed on a transformer; Figure 2 This is an overall diagram of the protective components in this invention; Figure 3 This is the present invention. Figure 2 Enlarged view of a portion of point A in the middle; Figure 4 This is an internal structural diagram of the protective component in this invention; Figure 5 This is a structural diagram of the first protective component in this invention; Figure 6 This is the present invention. Figure 5 Enlarged view of a section at point B in the middle; Figure 7 This is a structural diagram of the second protective component in this invention; Figure 8 This is a top view of the protective component in this invention; Figure 9 This is the present invention. Figure 8 Sectional view at CC; Figure 10 This is the present invention. Figure 9 Enlarged view of a section at point D; Figure 11 This is the present invention. Figure 9 Enlarged view of a section at point E in the middle; Figure 12 This is the present invention. Figure 9 Enlarged view of a section at point F.

[0019] In the diagram: 1. Transformer; 11. Insulating bushing; 12. Conductive rod; 13. Terminal block; 14. Busbar; 15. Crimping terminal; 16. Bolt; 17. Nut; 2. Casing; 201. Push plate; 21. Circular plate; 22. Slide rail; 23. Cylinder; 24. Rubber tube; 25. U-shaped plate; 26. Rectangular plate; 27. Slide groove; 28. Slide plate; 29. ​​First semi-circular groove; 3. Rectangular groove; 31. Vertical plate; 32. Push rod; 33. Semi-circular block ; 4. Machine screw; 41. Arc plate; 42. Guide rod; 43. Arc groove; 44. Vertical compartment; 45. Circular groove; 46. Baffle; 47. Columnar groove; 48. Circular block; 5. Protective compartment; 51. Rotary roller; 52. Sponge layer; 53. Groove; 54. Trapezoidal plate; 55. Motor; 56. Extrusion roller; 57. Leakage hole; 6. Long rod; 61. Trapezoidal block; 62. Second semicircular groove; 63. Scraper; 64. Leakage groove; 7. Bend; 71. Short pipe. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 12 As shown, a large transformer and its protective assembly according to the present invention, as an embodiment of the present invention, includes a first protective assembly; the first protective assembly includes a protective sleeve 2, and the top of the protective sleeve 2 is closed and has a first inlet slot; A circular plate 21 slides inside the protective sleeve 2, and the circular plate 21 can slide completely out of the protective sleeve 2; a slider is fixed on the outer ring of the circular plate 21; a slide rail 22 is opened on the inner ring of the protective sleeve 2, and the slider slides in the slide rail 22. A cylindrical tube 23 is fixed to the bottom of the circular plate 21; a rubber tube 24 is fixed to the bottom of the cylindrical tube 23, and the rubber tube 24 has a multi-umbrella columnar structure; the rubber tube 24 is used to be sleeved on the multi-umbrella columnar insulating sleeve 11 at the top of the transformer 1. A conductive rod 12 passes through the inside of the insulating sleeve 11; a terminal 13 is installed on the top of the conductive rod 12, and the terminal 13 is locked and fixed to the crimp terminal 15 on the external busbar 14 by bolts 16 and nuts 17. The inner left side of the cylinder 23 is provided with a U-shaped plate 25; the inner right side of the cylinder 23 is provided with a rectangular plate 26; a groove 27 is opened in the circular plate 21, and two sliding plates 28 slide in the groove 27, and the total length of the sliding plates 28 is less than the length of the groove 27; the sliding plates 28 slide above the cylinder 23. Each of the two sliding plates 28 has a first semi-circular groove 29 on one side opposite to the other, and each of the first semi-circular grooves 29 has a rubber layer inside; each of the two sliding plates 28 has an inclined surface on the opposite side. Two push plates 201 are fixed at the top of the inner cavity of the cylinder 23, and the bottom of the push plate 201 is arc-shaped, corresponding to the inclined surface on the slide plate 28. Both sides of the casing 2 are provided with evenly arranged threaded grooves, and the threaded grooves are all threaded with granulator screws 4. A second protective component is installed on the top of the casing 2; In this embodiment, a rectangular groove 3 is formed in the inner wall of the cylinder 23 on the opposite side of the U-shaped plate 25 and the rectangular plate 26; a vertical plate 31 is fixed in the rectangular groove 3. Each of the upright plates 31 has a push rod 32 that slides inside it; the two push rods 32 are respectively close to one side of the U-shaped plate 25 or the rectangular plate 26 and are respectively fixed on the adjacent U-shaped plate 25 or the rectangular plate 26. A semicircular block 33 is fixed on one side of each of the two push rods 32, and the semicircular block 33 corresponds to the arc surface of the bottom of the push plate 201; a spring connects the semicircular block 33 and the upright plate 31.

[0022] When wiring transformer 1, first slide the circular plate 21 out of the casing 2. When sliding out the circular plate 21, ensure that the nut screw 4 does not extend into the casing 2. Then, insert the external busbar 14 into the casing 2 through the first inlet slot at the top of the casing 2 and out from the bottom of the casing 2. Then, pass the busbar 14 through the first semi-circular groove 29 between the two slide plates 28 and through the bottom of the rubber cylinder 24. After the busbar 14 passes through the bottom of the rubber cylinder 24, align the crimp terminal 15 on the busbar 14 with the terminal 13 at the top of the guide rod. Then, pass the bolt 16 through the crimp terminal 15 and the terminal 13, and fix it with a washer and nut 17 on the side where the bolt 16 passes through, thereby connecting the busbar 14 to the conductive rod 12. Then, the rubber cylinder 2... 4. Spread out and gradually put the rubber cylinder 24 onto the insulating sleeve 11. As the rubber cylinder 24 is gradually put onto the insulating sleeve 11, it will gradually move the circular plate 21 and the cylindrical cylinder 23 at the bottom of the circular plate 21 closer to the bottom of the insulating sleeve. At the same time, adjust the position of the cylindrical cylinder 23 so that the side of the U-shaped plate 25 inside the cylindrical cylinder 23 is aligned with the nut 17, and the side of the rectangular plate 26 inside the cylindrical cylinder 23 is aligned with the head of the bolt 16. When the rubber cylinder 24 is completely put onto the insulating sleeve 11, the rubber cylinder 24 will shrink and cover the insulating sleeve 11. At the same time, the nut 17 will be located on one side of the U-shaped plate 25, and the bolt 16 passing through the nut 17 will extend into the U-shaped plate 25. The head of the bolt 16 will be located on one side of the rectangular plate 26. Then the protective sleeve 2 can be installed. Specifically, when installing the protective sleeve 2, first align the protective sleeve 2 with the circular plate 21, and align the slider on the circular plate 21 with the slide rail 22 inside the protective sleeve 2. Then, slide the protective sleeve 2 downwards along the circular plate 21, and the slider will slide within the slide rail 22. During the downward sliding of the protective sleeve 2, the insulating sleeve 11 with the rubber cylinder 24 will gradually extend into the interior of the protective sleeve 2, and at the same time, it will drive the push plate 201 inside the protective sleeve 2 to move downwards. Since the arc surface at the bottom of the push plate 201 corresponds to the inclined surface at the top of the slide plate 28, when the push plate 201 moves downwards, it will first contact the inclined surface at the top of the slide plate 28, and then push the two slide plates 28 to move to the opposite side. Thus, the first semi-circular groove 29 can be used to lock and fix the passing busbar 14. At the same time, since a rubber layer is fixed inside the first semi-circular groove 29... When the first semicircular groove 29 contacts the busbar 14, the rubber layer will adhere to the busbar 14, thereby sealing the busbar 14 in the first semicircular groove 29 while locking and fixing it. At the same time, since the push plate 201 corresponds to the semicircular block 33, when the push plate 201 moves down, it will first contact the semicircular block 33, and then push the semicircular block 33 to the opposite side. At the same time, the push rod 32 will drive the U-shaped plate 25 and the rectangular plate 26 to move closer to each other. During the movement of the rectangular plate 26, the bolt 16 head will be attached and abutted against the bolt 16 head. During the movement of the U-shaped plate 25, both sides of the U-shaped plate 25 will be attached to the nut 17 and abutted against the nut 17. During this process, the bolt 16 and nut 17 of the locking terminal 13 and the crimping terminal 15 can be limited and fixed. More specifically, after the casing 2 is attached to the top of the transformer 1, the nut screws 4 in the multiple threaded grooves are rotated sequentially using an Allen wrench. As the nut screws 4 are rotated, they gradually extend into the casing 2 and into the space between adjacent skirts. When the nut screws 4 are inserted between adjacent skirts of the insulating sleeve 11, they abut against the rubber sleeve 24 covering the insulating sleeve 11, thereby fixing the rubber sleeve 24. At this time, the end of the nut screw 4 is completely located in the threaded groove. Simultaneously, since the nut screw 4 is abutted against the rubber sleeve 24 and located between adjacent skirts, the nut screw 4 can be limited, thereby limiting the overall casing 2. Furthermore, during installation, the casing 2 moves downward, causing the push plate 201 to move downward simultaneously. The push plate 201, through the cooperation of the arc surface and the semi-circular block 33, drives the push rod 32 to push the U-shaped plate and the rectangular plate 26 to precisely clamp the bolt 16 head and the nut 17, ensuring that the U-shaped plate 25 and the rectangular plate 26 always form a stable clamping limit on the bolt 16 and the nut 17. This structure can offset the impact of external vibration on the bolt 16, prevent the bolt 16 from relaxing due to vibration, and avoid the preload from decreasing, thereby ensuring that the terminal block 13 and the crimp terminal 15 always maintain a stable contact pressure, thus preventing the connection from burning. The occurrence of faults such as corrosion and lead wire melting is prevented. At the same time, during the downward movement of the push plate 201, the two slide plates 28 are driven to move relative to each other. The busbar 14 is tightly locked and fixed through the first semi-circular groove 29 with rubber layer. This not only restricts the radial and axial displacement of the busbar 14, but also absorbs the vibration of the busbar 14 itself through the elastic buffer of the rubber layer, preventing the vibration of the busbar 14 from being transmitted to the connection point, and further improving the vibration resistance stability of the terminal connection structure. If the busbar 14 is blown by strong winds, the busbar 14, which is limited and fixed, can prevent it from moving with the strong winds and pull on the crimp terminal 15. Meanwhile, the presence of the protective sleeve 2 effectively blocks natural environmental factors such as rainwater, dust, salt spray, and moisture from corroding the connection between the terminal block 13 and the crimp terminal 15. Because the top of the protective sleeve 2 is a closed design, it completely shields the connection between the busbar 14 and the conductive rod 12, preventing direct contact with external environmental media. Simultaneously, the two sliding plates 28 on the circular plate 21 clamp the busbar 14 through the first semi-circular groove 29, and the rubber layer inside the semi-circular groove 45 is tightly fitted to the surface of the busbar 14, achieving both fixed positioning of the busbar 14 and sealing the insertion point of the busbar 14, preventing dust and moisture from intruding through the inlet gap. This effectively avoids corrosion of metal components and aging of insulation materials, reduces the risk of surface flashover, and significantly improves the environmental adaptability and service life of the connection.

[0023] As one embodiment of the present invention; the granulator screw 4 is provided with an arc-shaped plate 41, and the arc-shaped plate 41 is rotatably connected to the granulator screw 4; A guide rod 42 is fixed on the arc plate 41; a through hole is opened above the nut screw 4, and the guide rod 42 slides in the through hole; an arc groove 43 is opened in the inner ring of the sleeve 2, and the arc plate 41 is initially completely located in the arc groove 43; The inner diameter of the arc-shaped plate 41 is the same as the inner diameter of the sleeve 2; In this embodiment, vertical compartments 44 are fixed on both sides of the protective sleeve 2, and the vertical compartments 44 are rectangular; The vertical compartment 44 has a vertical groove running through its middle section, dividing it into two parts. A circular groove 45 is provided on the side of the vertical compartment 44 facing the threaded groove, and the diameter of the circular groove 45 is larger than the diameter of the nut screw 4, and the width of the vertical groove is larger than the diameter of the guide rod 42. A baffle 46 is inserted inside the vertical compartment 44; In this embodiment, the baffle 46 is provided with uniformly arranged cylindrical grooves 47, and the number of cylindrical grooves 47 is the same as the number of circular grooves 45, and they correspond one-to-one. A circular block 48 slides inside the cylindrical groove 47, and the circular block 48 is connected to the cylindrical groove 47 by a spring. In the initial state, the circular block 48 extends partially out of the cylindrical groove 47.

[0024] Since the arc plate 41 is rotatably connected to the grommet 4, and the arc plate 41 is initially located in the arc groove 43, it will not be affected when the round plate 21 slides in the protective sleeve 2. When the grommet 4 is rotated, the grommet 4 will drive the arc plate 41 to gradually approach the rubber cylinder 24, and the arc plate 41 will not rotate under the limit of the guide rod 42. When the arc plate 41 is in contact with the rubber cylinder 24 covered by the insulating sleeve 11, the contact area with the rubber cylinder 24 can be increased, and the fixing effect can be improved. Since the long cylinder has a round groove 45, when the grommet 4 is rotated, the internal hex bolt 16 can pass through the round groove 45. When the grommet 4 needs to be turned out, the grommet 4 will gradually extend into the round groove 45, and it will not affect the turning out of the grommet 4. Specifically, after the arc plate 41 is attached to the rubber cylinder 24, the end of the nut screw 4 is located in the threaded groove. Then, the baffle 46 is inserted into the vertical compartment 44. Since there is a round block 48 sliding on the baffle 46 through the spring, during the insertion of the baffle 46, the round block 48 is pushed into the cylindrical groove 47. When all the round blocks 48 are aligned with all the round grooves 45, the round blocks 48 will extend out under the action of the spring and insert into the round groove 45 to be stuck. In this process, not only can the baffle 46 be used to block the nut screw 4, but the round blocks 48 can also be used to limit and fix the baffle 46. More specifically, by making the arc plate 41 and the rubber cylinder 24 covering the insulating sleeve 11 form a surface contact, the contact area is greatly increased. This not only disperses the pressure of the grommet 4 on the rubber cylinder 24 and prevents the rubber cylinder 24 from being deformed and damaged locally, but also increases the fixing friction, effectively preventing the grommet 4 from loosening under high-frequency vibration and improving the stability of the protective sleeve 2. At the same time, when the baffle 46 is inserted into the vertical compartment 44, the round block 48 automatically extends into the round groove 45 under the action of the spring, realizing the precise positioning and fixing of the baffle 46. The baffle 46 can directly block the head of the grommet 4, restricting the rotation of the grommet 4 from a mechanical structure perspective, eliminating the problem of the grommet 4 loosening due to long-term vibration, thermal stress and other factors. This can prevent the protective sleeve 2 from shaking under the action of vibration, which would affect the connection effect at the connection between the busbar 14 and the conductive rod 12.

[0025] As one embodiment of the present invention; the second protective component includes a protective chamber 5; the protective chamber 5 is fixed to the top of the protective cylinder 2; The top of the protective chamber 5 is provided with a second cable inlet slot; a water flow sensor is installed on the right side of the second cable inlet slot inside the protective chamber 5. The protective chamber 5 is equipped with two mirrored rotating belts, and the two rotating belts are constrained into a triangle by three rotating rollers 51; a sponge layer 52 is fixed on the outer ring of the rotating belt, and the opposite sides of the two sponge layers 52 are attached to each other. The outer ring of the sponge layer 52 has a groove 53, and the cross-section of the groove 53 is semi-circular; and the diameter of the groove 53 is the same as the diameter of the busbar 14. Each of the three rollers 51 in the conveyor belt has a trapezoidal plate 54 on both sides, and the rollers 51 rotate on the trapezoidal plate 54. One of the rollers 51 is driven by a motor 55. Both sides of the two conveyor belts are provided with extrusion rollers 56, and the extrusion rollers 56 rotate on the trapezoidal plate 54; the extrusion rollers 56 intersect with the sponge layer 52; and the two extrusion rollers 56 are provided with drainage holes 57 on opposite sides. In this embodiment, the trapezoidal plate 54 slides within the protective chamber 5; Each trapezoidal plate 54 is provided with a long rod 6 on the side near the protective chamber 5, and one side of the long rod 6 slides inside the trapezoidal plate 54, while the other side is fixed to the protective chamber 5; a spring is sleeved on the long rod 6, and the spring is in a compressed state. In this embodiment, trapezoidal blocks 61 are mirror-shaped below the two conveyor belts; The two trapezoidal blocks 61 have a second semicircular groove 62 on one side opposite to each other, and the second semicircular grooves 62 fit together. Scraper 63 is fixed on the inclined surface of the two trapezoidal blocks 61, and the scraper 63 is semi-circular; a groove 64 is provided on the scraper 63.

[0026] During installation, the busbar 14 is first passed through the second inlet slot at the top of the protective chamber 5, then the busbar 14 is passed through the groove 53 between the opposing sponge layers 52, and then through the second semi-circular groove 62 between the mutually fitting trapezoidal blocks 61. The busbar 14 is then passed through the first protective assembly. After the first and second protective assemblies are installed, the connection between the busbar 14 and the conductive rod 12 can be protected. Specifically, the protective chamber 5 shields the first cable inlet slot, preventing rainwater from entering the casing 2. Since a water flow sensor is installed on the top of the protective chamber 5 near the second cable inlet slot, if the seal between the busbar 14 and the second cable inlet slot weakens with prolonged use, some rainwater may enter the protective chamber 5 through the second cable inlet slot. This rainwater will be detected by the water flow sensor, which will then control two motors 55 to rotate, causing two rotating belts to rotate. The left belt rotates the sponge layer 52 counterclockwise, and the right belt rotates the sponge layer 52 clockwise. The rotating sponge layer 52 moves along the busbar 14 from bottom to top. During this rotation, the sponge layer 52 will... The water flowing along the busbar 14 is adsorbed, thus preventing the water from flowing further downward and reaching the connection between the busbar 14 and the conductive rod 12. This causes the terminals 13 and crimp terminals 15 at the connection to be corroded and their oxidation to be accelerated, resulting in the formation of an oxide film. This not only increases the contact resistance but also causes overheating. At the same time, since the sponge layer 52 is rotating in a circular manner, different positions of the sponge layer 52 can contact the busbar 14. When the sponge layer 52 rotates to the position of the squeezing roller 56, the squeezing roller 56 intersects with the sponge layer 52, thus squeezing the sponge layer 52 and squeezing out the water adsorbed in the sponge layer 52. The squeezed water falls into the protective chamber 5 and then flows out through the drain hole 57. More specifically, since the long rod 6 sliding inside the trapezoidal plate 54 is fixed on the other side of the protective chamber 5, and the spring between the trapezoidal plate 54 and the protective chamber 5 is in a compressed state, the spring squeezes the trapezoidal plate 54, causing the trapezoidal plates 54 on both sides to tend to move closer to each other. Because the trapezoidal plates 54 on both sides tend to move closer to each other, the sponge layers 52 on both sides can better fit with the middle busbar 14. When the sponge layer 52 is compressed after long-term use, the trapezoidal plates 54 tend to move closer to each other, thus pushing the compressed sponge layer 52 to always fit with the busbar 14, avoiding the gap between the sponge layer 52 and the busbar 14 that prevents water flowing down the busbar 14 from being unable to be cleaned. Furthermore, since the busbar 14 is in contact with the second circular groove 45 of the trapezoidal block 61, and the trapezoidal block 61 is also close to the trapezoidal plate 54, the degree of contact and sealing between the second semi-circular groove 62 and the busbar 14 can be improved. If the water flows along the busbar 14 to the position of the trapezoidal block 61, the trapezoidal block 61 can block part of the water flow. The blocked water flow will flow along the inclined surface of the trapezoidal block 61 and continue to flow downward through the groove 64 on the scraper 63, and finally flow out from the hole 57. At the same time, since the scraper 63 is fixed on the trapezoidal block 61, when the sponge layer 52 passes through the extrusion roller 56, it will pass through the scraper 63. The scraper 63 will scrape the sponge layer 52 again, thereby scraping off the residual water and preventing the residual water from adhering to the busbar 14. Furthermore, by rotating and adsorbing along the busbar 14, the sponge layer 52 can remove rainwater flowing down the busbar 14, blocking the penetration channel of rainwater to the connection between the terminal block 13 and the crimp terminal 15; the second semi-circular groove 62 of the trapezoidal block 61 fits tightly with the busbar 14 to form a secondary barrier, which, together with the scraper 63, removes residual moisture from the sponge layer 52, further preventing moisture residue and secondary contamination; thus solving the problem of easy water seepage through the gaps in the busbar 14 in traditional protection, effectively preventing problems such as terminal oxidation and increased contact resistance caused by rainwater erosion. At the same time, due to the continuous compression force of the spring pushing the trapezoidal plates 54 closer to each other, the sponge layer 52 always fits tightly against the surface of the busbar 14. Even if the sponge layer 52 is compressed and deformed due to long-term use, it can still maintain the fit through the elastic compensation of the spring, avoiding rainwater residue due to gaps in the fit, which would cause rainwater to continue to flow down the busbar 14.

[0027] As one embodiment of the present invention; the top of the protective chamber 5 is fixed with a bent pipe 7, and the opening of the bent pipe 7 is inclined downward; Multiple short pipes 71 are arranged in sequence at the opening of the bend 7, and the multiple short pipes 71 are concentrically arranged and inclined downward. There is a gap between the multiple short tubes 71; adjacent short tubes 71 are hinged by a pivot, and the multiple short tubes 71 can swing left and right; During installation, the busbar 14 is first passed through multiple short pipes 71, then through the bend 7, and then through the second protective assembly and the first protective assembly. Since the bend 7 opens downwards and the multiple short pipes 71 also open downwards, when it rains, if rainwater flows downwards along the busbar 14, some of the rainwater will flow into the short pipes 71 and drip downwards. The rainwater dripping into the short pipes 71 will flow out along the inclined short pipes 71. Since there is a gap between adjacent short pipes 71, rainwater can flow out through the gap between the short pipes 71, reducing the total amount of rainwater that seeps into the protective chamber 5 and the casing 2 from the source. Specifically, since the multiple short pipes 71 are connected by a pivot, when the busbar 14 is affected by strong winds, the short pipes 71 will rotate simultaneously. The rotating pipes can protect the busbar 14 and prevent the short pipes 71 from being fixed. When the busbar 14 moves due to strong winds, the busbar 14 will only contact the opening, causing the busbar 14 to bend.

[0028] A large transformer includes a transformer 1; an insulating bushing 11 is installed on the transformer 1; and the aforementioned large transformer protection assembly is installed on the insulating bushing 11.

[0029] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large transformer protection assembly, characterized in that, It includes a first protective component; the first protective component includes a protective sleeve (2), and the top of the protective sleeve (2) is closed and has a first inlet slot; A circular plate (21) slides inside the protective sleeve (2); a slider is fixed on the outer ring of the circular plate (21); a slide rail (22) is opened on the inner ring of the protective sleeve (2); A cylinder (23) is fixed to the bottom of the circular plate (21); a rubber cylinder (24) is fixed to the bottom of the cylinder (23); the rubber cylinder (24) is used to be fitted onto the insulating sleeve (11) on the top of the transformer (1); The insulating sleeve (11) has a conductive rod (12) running through it; a terminal (13) is installed on the top of the conductive rod (12), and the terminal (13) is locked and fixed to the crimp terminal (15) on the external busbar (14) by bolts (16) and nuts (17); The inner left side of the cylinder (23) is provided with a U-shaped plate (25); the inner right side of the cylinder (23) is provided with a rectangular plate (26); a groove (27) is provided in the circular plate (21), and two sliding plates (28) slide in the groove (27); Each of the two slide plates (28) has a first semi-circular groove (29) on one side opposite to the other, and each of the first semi-circular grooves (29) has a rubber layer inside; each of the two slide plates (28) has an inclined surface on one side opposite to the other. Two push plates (201) are fixed at the top of the inner cavity of the cylinder (23), and the bottom of the push plate (201) is an arc surface, which corresponds to the inclined surface on the slide plate (28); The protective sleeve (2) has evenly arranged threaded grooves on both sides, and the threaded grooves are threaded with nut screws (4); a second protective component is installed on the top of the protective sleeve (2).

2. The large transformer protection assembly according to claim 1, characterized in that: The U-shaped plate (25) and the rectangular plate (26) are located on opposite sides of the inner wall of the cylinder (23) and a rectangular groove (3) is formed therein; a vertical plate (31) is fixed in the rectangular groove (3); Each of the upright plates (31) has a push rod (32) that slides inside; the two push rods (32) are respectively close to one side of the U-shaped plate (25) or the rectangular plate (26) and are respectively fixed on the U-shaped plate (25) or the rectangular plate (26) that are close to each other; A semicircular block (33) is fixed on one side of each of the two push rods (32), and the semicircular block (33) corresponds to the arc surface at the bottom of the push plate (201); a spring is connected between the semicircular block (33) and the upright plate (31).

3. The large transformer protection assembly according to claim 1, characterized in that: The granulator screw (4) is provided with an arc plate (41), and the arc plate (41) is rotatably connected to the granulator screw (4); A guide rod (42) is fixed on the arc plate (41); a through hole is opened above the nut screw (4), and the guide rod (42) slides in the through hole; an arc groove (43) is opened in the inner ring of the sleeve (2), and the arc plate (41) is completely located in the arc groove (43) in the initial state; The inner diameter of the arc plate (41) is the same as the inner diameter of the sleeve (2).

4. The large transformer protection assembly according to claim 3, characterized in that: The protective sleeve (2) has vertical compartments (44) fixed on both sides, and the vertical compartments (44) are rectangular; The vertical compartment (44) has a vertical groove running through its middle section, dividing it into two parts. A circular groove (45) is provided on the side of the vertical compartment (44) facing the threaded groove. The diameter of the circular groove (45) is larger than the diameter of the nut screw (4), and the width of the vertical groove is larger than the diameter of the guide rod (42). A baffle (46) is inserted inside the vertical compartment (44).

5. The large transformer protection assembly according to claim 4, characterized in that: The baffle (46) has uniformly arranged cylindrical grooves (47) inside, and the number of cylindrical grooves (47) is the same as the number of circular grooves (45), and they correspond one-to-one. A circular block (48) slides inside the cylindrical groove (47), and the circular block (48) is connected to the cylindrical groove (47) by a spring, and the circular block (48) extends out of the cylindrical groove (47) in the initial state.

6. The large transformer protection assembly according to claim 1, characterized in that: The second protective component includes a protective chamber (5); the protective chamber (5) is fixed to the top of the protective casing (2); The top of the protective chamber (5) is provided with a second cable inlet slot; a water flow sensor is installed on the right side of the second cable inlet slot inside the protective chamber (5); The protective chamber (5) is equipped with two mirrored rotating belts, and the two rotating belts are constrained into a triangle by three rotating rollers (51); a sponge layer (52) is fixed on the outer ring of the rotating belt, and the opposite sides of the two sponge layers (52) are attached to each other; The outer ring of the sponge layer (52) has a groove (53) and the cross-section of the groove (53) is semi-circular; and the diameter of the groove (53) is the same as the diameter of the generatrix (14); Each of the three rollers (51) in the conveyor belt has a trapezoidal plate (54) on both sides, and the rollers (51) rotate on the trapezoidal plate (54), and one of the rollers (51) is driven by a motor (55); Both sides of the two conveyor belts are provided with extrusion rollers (56), and the extrusion rollers (56) rotate on the trapezoidal plate (54); the extrusion rollers (56) intersect with the sponge layer (52); and the two extrusion rollers (56) are provided with drainage holes (57) on opposite sides.

7. The large transformer protection assembly according to claim 6, characterized in that: The trapezoidal plate (54) slides within the protective chamber (5); Each trapezoidal plate (54) has a long rod (6) on the side near the protective chamber (5), and one side of the long rod (6) slides inside the trapezoidal plate (54), while the other side is fixed to the protective chamber (5); a spring is sleeved on the long rod (6), and the spring is in a compressed state.

8. The large transformer protection assembly according to claim 7, characterized in that: Below the two conveyor belts are mirror-mounted trapezoidal blocks (61); The two trapezoidal blocks (61) have a second semicircular groove (62) on one side opposite to each other, and the second semicircular grooves (62) fit together. A scraper (63) is fixed on the inclined surface of the two trapezoidal blocks (61), and the scraper (63) is semi-circular; a groove (64) is provided on the scraper (63).

9. The large transformer protection assembly according to claim 6, characterized in that: The top of the protective chamber (5) is fixed with a bent pipe (7), and the opening of the bent pipe (7) is inclined downward. The opening of the bend (7) is provided with a number of short pipes (71) arranged in sequence, and the short pipes (71) are arranged concentrically and inclined downward. There is a gap between the multiple short tubes (71); adjacent short tubes (71) are hinged by a pivot, and the multiple short tubes (71) can swing left and right.

10. A large transformer, comprising a transformer (1); wherein an insulating bushing (11) is installed on the transformer (1); characterized in that: The insulating sleeve (11) is equipped with a large transformer protection assembly as described in any one of claims 1 to 9.

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