A 20kV oil-immersed transformer

Abstract

The present invention relates to the technical field of transformer devices, specifically a 20KV oil-immersed transformer, comprising an oil-immersed transformer body, a cover assembly mounted on the top of the oil-immersed transformer body, the cover assembly protecting the wiring terminals of the oil-immersed transformer body; the cover assembly comprising a bottom frame plate and a protective cover box with an opening at the bottom, the bottom frame plate being fixedly mounted on the top of the oil-immersed transformer body, the wiring terminals of the oil-immersed transformer body being placed inside the bottom frame plate; an operating opening is provided on one side of the protective cover box, a sealing baffle is provided inside the protective cover box, and the protective cover box is fixed to the bottom frame plate via a driving mechanism. The device can quickly install the protective cover body, stably block or open the operating opening, and when maintenance personnel perform maintenance work on electrical components or structures inside the protective cover body, the oil-immersed transformer can be forced to be powered off, thereby protecting personnel safety.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer devices, and in particular to a 20KV oil-immersed transformer. Background Art

[0002] In the power system, 20KV oil-immersed transformer is a key substation equipment.

[0003] Currently, the outgoing cables of most oil-immersed transformers on the market are directly exposed on the top of the oil tank cover, which is easily affected by the external environment, such as impact from foreign objects, contamination from debris, rain and dust, etc.

[0004] For this purpose, a protective cover is used to protect it.

[0005] For example, Chinese patent application No. 201120467424.0 describes an oil-immersed transformer with a top safety cover. The cover is installed using screws and other components, a time-consuming installation method. Furthermore, access to the wiring within the cover is required, and the access must be completely sealed with a door to ensure a low-humidity and dust-free environment. Finally, electrical installation of oil-immersed transformers also presents certain electrical hazards.

[0006] In order to enable the cover that can protect the internal terminal blocks to be quickly installed, the working port to be opened or stably sealed at any time, and the oil-immersed transformer terminal blocks therein to be safely maintained, a 20KV oil-immersed transformer is designed. The protective cover can be quickly installed, the working port can be stably blocked or opened, and when maintenance personnel perform maintenance operations on electrical components or structures inside the protective cover, the oil-immersed transformer can be forced to be powered off to protect personnel safety. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the existing technology. The present invention proposes a 20KV oil-immersed transformer, which can quickly install a protective cover and stably seal or open the working port. When maintenance personnel perform maintenance work on electrical components or structures in the protective cover, the oil-immersed transformer can be put into a forced power-off state to protect the safety of personnel.

[0008] To solve the above technical problems, the present invention adopts the following technical solution: a 20KV oil-immersed transformer, comprising:

[0009] An oil-immersed transformer body, and a cover assembly mounted on top of the oil-immersed transformer body, wherein the cover assembly protects the connection terminals of the oil-immersed transformer body;

[0010] The cover assembly includes a bottom frame plate and a protective cover box with an opening at the bottom, wherein the bottom frame plate is fixedly mounted on the top of the oil-immersed transformer body, and the connection terminals of the oil-immersed transformer body are placed in the bottom frame plate;

[0011] An operating port is provided on one side of the protective cover box, and a sealing baffle is provided in the protective cover box. The protective cover box is first fixedly installed on the bottom frame plate by a driving mechanism, and then the sealing baffle seals and blocks the operating port. The driving mechanism opens the operating port when the protective cover box is stably and sealed on the bottom frame plate, thereby facilitating maintenance of electrical components or structures in the protective cover box from the operating port. When the sealing baffle is sealed on the operating port, the wiring terminals of the oil-immersed transformer body are electrically connected to the corresponding wires through the electrical protection mechanism. When the sealing baffle is away from the operating port, the electrical protection mechanism electrically disconnects the wiring terminals of the oil-immersed transformer body from the corresponding wires, and can prevent the external connection lines from being pulled, so that the device can be used stably, safely and quickly.

[0012] Preferably, the driving mechanism includes side plates, the outer walls on both sides of the bottom frame plate are fixedly connected to the side plates, the bottoms on both sides of the protection cover box are fixedly connected to L-shaped pressure plates, the two L-shaped pressure plates can reach the bottoms of the side plates from the sides of the bottom frame plate, the inner wall of the protection cover box is slidably connected to a sealing pressure plate in an upper and lower limited manner, the middle part of the sealing pressure plate is provided with a slot for facilitating maintenance of electrical appliances and structures in the protection cover box, a second threaded rod is rotatably connected between the protection cover box and the two L-shaped pressure plates, and the sealing pressure plate is threadedly connected to the outer walls of the two second threaded rods;

[0013] The invention also includes a rotating mechanism, which causes the two second threaded rods to rotate synchronously, thereby clamping the sealing pressure plate and the L-shaped pressure plate to the top and bottom of the side plate, completing the rapid installation of the protective cover box, the side plate, and the bottom frame plate;

[0014] The utility model also comprises a lateral movement mechanism, wherein the lateral movement mechanism enables the sealing baffle to seal the working operation port.

[0015] Preferably, the rotating mechanism includes two fixed bearing seats, the two fixed bearing seats are respectively fixedly mounted on the inner walls on both sides of the protective cover box, the two fixed bearing seats are both limitedly rotatably connected to the first rotating column, the top axis centers of the two first rotating columns are fixedly connected to a spline shaft, the tops of the two spline shafts are limitedly rotatably connected to the top of the protective cover box, the two spline shafts are fixedly connected to the outer walls of the spline shafts through the toothed belts and gears together with the synchronous toothed belt for keeping the two spline shafts and the first rotating column rotating synchronously, and the outer walls of the two spline shafts are limitedly slidably connected up and down A spline sleeve is connected, and the outer wall of the spline sleeve is limited and rotatably connected to an auxiliary bearing seat. The auxiliary bearing seat is slidably connected to the protective cover box in an upper and lower limited manner, and two hydraulic cylinders are fixedly installed on the protective cover box. The bottom telescopic ends of the two hydraulic cylinders are respectively connected to the two auxiliary bearing seats, so as to drive the auxiliary bearing seats to move up and down. The outer wall of the spline sleeve is fixedly connected to a second gear, and the outer walls of the two second threaded rods are fixedly connected to the first gear. The two second gears can respectively engage with the two first gears. The synchronously rotating second threaded rods stably drive the sealing pressure plate and the L-shaped pressure plate to cooperate to firmly mount the protective cover box on the side plate and the bottom frame plate.

[0016] A motor is fixedly mounted on the protective cover box, and a power output end of the motor is connected to one of the spline shafts.

[0017] Preferably, the lateral movement mechanism includes an L-shaped bearing seat, each of the first rotating columns is connected to two L-shaped bearing seats in a limited rotation manner, the L-shaped bearing seats are fixedly mounted on the protective cover box, and the L-shaped bearing seat is connected to a first threaded rod in a limited rotation manner, one end of the first threaded rod is fixedly connected to a first bevel gear, and a second bevel gear engaged with the first bevel gear is fixedly mounted on the first rotating column, and the outer walls of the two first threaded rods placed on the same side are commonly threadedly connected to a limited slide, and the two limited slides are connected to the inner wall of the protective cover box in a front and rear limited sliding manner, and the two limited slides are fixedly connected to a connecting plate, and the two connecting plates are commonly fixedly connected to a sealing baffle on the side away from the limiting slide, and the movement of the sealing baffle can seal the operating port.

[0018] Preferably, a motor protection cover is installed on the protection cover box, and the motor is placed in the motor protection cover.

[0019] Preferably, an observation window is provided on a side of the protective cover box away from the operation port.

[0020] Preferably, the electrical protection mechanism includes a first sliding sleeve, and the two limiting sliding plates are fixedly installed with a first sliding sleeve on one side close to the sealing baffle. The first sliding sleeve is slidingly connected to the first sliding plate in a limited position, and a first elastic member is fixedly connected between the first sliding plate and the inner bottom of the first sliding sleeve. The first sliding plate is fixedly connected to a side away from the first sliding sleeve with a plurality of first matching conductive protrusions, and the plurality of first matching conductive protrusions are connected to a plurality of wiring terminals of the oil-immersed transformer body through a plurality of wires, so that the wiring terminals of the oil-immersed transformer body can be connected to external circuits. Two sleeve plates are fixedly installed on the inner wall of the side wall of the protective cover box where the operating operation port is provided, and the first sliding plate can be slidingly connected in the sleeve plate in a limited position. In addition, the sleeve plate groove is provided with the same number of second matching conductive grooves as the first matching conductive protrusions, and multiple first matching conductive protrusions are respectively electrically connected with multiple second matching conductive grooves, and multiple second matching conductive grooves are each provided with auxiliary circuits, so that multiple first matching conductive protrusions are respectively connected with multiple auxiliary circuits, and the multiple auxiliary circuits are installed on the side of the second matching conductive grooves away from the multiple auxiliary circuits. The wire wiring block is installed with external circuits that are the same in number as the auxiliary circuits and are connected. The external circuits pass through the second wire hole on the sealing pressure plate and the first wire hole on the L-shaped pressure plate. An anti-line pulling mechanism is also connected between the sleeve plate and the wire wiring block.

[0021] Preferably, the anti-line pulling mechanism includes a second elastic member, and the second elastic member is connected between the sleeve plate and the wire connection block, and the number of the second elastic members is at least two.

[0022] Preferably, it also includes a controller and a battery, and the controller is electrically connected to the battery, the motor, and the hydraulic cylinder for controlling the operation of the device.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The device only needs to move the L-shaped pressure plate to the bottom of the side panel, and then start the motor to stably install the protective cover box on the side panel and the bottom frame panel to protect the wiring terminals on the top of the oil-immersed transformer body; and various circuits inside the protective cover box can be installed through the operation port; and then start the hydraulic cylinder and the motor to seal the operation port on the protective cover box, so that the device maintains a relatively good sealing state to protect the wiring terminals on the top of the oil-immersed transformer body; and reverse the motor again to open the operation port, which is convenient for maintaining the electrical components and structures in the protective cover box.

[0025] The sealing baffle blocks the operation port inside, making the device anti-theft and difficult to open; when the sealing baffle completes the blocking of the operation port, the oil-immersed transformer body is automatically electrically connected to the external circuit; when the sealing baffle contacts the blocking operation port, the oil-immersed transformer body is automatically disconnected from the external circuit, so that when personnel are maintaining electrical components or other structures inside the protective cover box, the oil-immersed transformer body automatically stops being electrically connected, protecting the safety of the maintenance personnel and prohibiting the maintenance personnel from working with the oil-immersed transformer body under power from the source.

[0026] When external objects fall onto the operating port, or when the protective cover box is deformed, the sealing baffle no longer blocks the operating port. At this time, the oil-immersed transformer body is automatically forced to cut off the power supply, thereby protecting the oil-immersed transformer body and preventing damage to the oil-immersed transformer body and causing danger. When the external lines connected to the terminal blocks are dragged, there is a certain elastic recovery force, so that when the oil-immersed transformer body is dragged, the external lines connected to the terminal blocks are forcibly dragged without affecting the terminal blocks of the oil-immersed transformer body, thereby greatly protecting the safety of the oil-immersed transformer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components.

[0028] in:

[0029] FIG1 is a schematic diagram of the overall structure of the device from a first perspective of the present invention;

[0030] FIG2 is a schematic diagram of the overall structure of the device from a second perspective of the present invention;

[0031] FIG3 is a schematic structural diagram of the side panels and bottom frame panels of the present invention installed on the body of an oil-immersed transformer;

[0032] FIG4 is a schematic structural diagram of the top and back of the see-through protective cover box of the present invention from a first viewing angle;

[0033] FIG5 is a schematic structural diagram of the top and back of the see-through protective cover box of the present invention from a second viewing angle;

[0034] FIG6 is a schematic structural diagram of the top and back of the see-through protective cover box of the present invention from a third viewing angle;

[0035] FIG7 is an enlarged structural diagram of point A in FIG6 of the present invention;

[0036] FIG8 is a schematic structural diagram of the top and back of the see-through protective cover box of the present invention from a fourth viewing angle;

[0037] FIG9 is an enlarged structural diagram of point B in FIG8 of the present invention;

[0038] FIG10 is a schematic diagram of the front plate of the rearview protection cover box structure of the present invention;

[0039] FIG11 is an enlarged structural diagram of point C in FIG10 of the present invention;

[0040] FIG12 is a schematic cross-sectional view of the cooperation between the first slide plate and the first sliding sleeve of the present invention;

[0041] FIG13 is an enlarged structural diagram of the left portion of FIG5 of the present invention;

[0042] FIG14 is an enlarged structural diagram of point D in FIG13 of the present invention.

[0043] Numbers in the figure: 1. Oil-immersed transformer body; 2. Side plate; 3. Bottom frame plate; 4. Protective cover box; 5. Operation opening; 6. L-shaped pressure plate; 7. Sealing baffle; 8. Limiting slide plate; 9. Synchronous toothed belt; 10. Sealing pressure plate; 11. First threaded rod; 12. First wire hole; 13. Notch; 14. Second threaded rod; 15. Fixed bearing seat; 16. Second wire hole; 17. Connecting plate; 18. First gear; 19. First rotating column; 20. First bevel gear; 21. Second bevel gear; 22. L-shaped bearing seat; 23. Auxiliary bearing seat; 24. Hydraulic cylinder; 25. Spline shaft; 26. Spline shaft sleeve; 27. Second gear; 28. First sliding sleeve; 29. ​​First slide plate; 30. Bushing; 31. Wire terminal block; 32 , first elastic member; 33, first matching conductive protrusion; 34, second elastic member; 35, auxiliary circuit; 36, second matching conductive groove; 37, observation window; 38, motor; 39, motor protection cover. DETAILED DESCRIPTION

[0044] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0045] Example 1:

[0046] This embodiment mainly includes an oil-immersed transformer body 1, a protective cover box 4, an L-shaped pressure plate 6, a second threaded rod 14, and a sealing pressure plate 10.

[0047] With particular reference to Figures 1, 2, and 3, the oil-immersed transformer body 1 is a conventional 20 kV oil-immersed transformer. A 20 kV oil-immersed transformer consists of an oil tank, an oil tank cover, electrical components located within the oil tank, heat sinks located outside the oil tank, and wiring terminals located on top of the oil tank cover. The wiring cables are divided into two types: high-voltage terminals and low-voltage outlet terminals. The oil-immersed transformer body 1 is a standard component commonly used by those skilled in the art. The present invention aims to protect the high-voltage terminals and low-voltage outlet terminals. Therefore, a protective cover 4 is designed to protect them from external dust and rain, thus creating a novel 20 kV oil-immersed transformer.

[0048] With particular reference to FIG4 , the protective cover box 4 is a box body with an opening at the bottom.

[0049] With particular reference to FIG3 , a bottom frame plate 3 is fixedly mounted on the top of the oil-immersed transformer body 1 . The bottom frame plate 3 is a box body with top and bottom openings. The left and right outer walls of the bottom frame plate 3 near the top are fixedly connected to the side panels 2 .

[0050] 4 , a working opening 5 is provided on the front side of the protective cover box 4 , and an observation window 37 is provided on the rear side of the protective cover box 4 .

[0051] With particular reference to FIG4 , the bottoms of both sides of the protective cover box 4 are fixedly connected with L-shaped pressing plates 6 , which are inwardly buckled.

[0052] With particular reference to Figures 4 and 5, the two L-shaped pressing plates 6 first enter the outer wall of the bottom frame plate 3 from the side without the side plates 2, and then rotate the protective cover box 4 so that the two L-shaped pressing plates 6 are placed at the bottom of the two side plates 2. This completes the preliminary placement of the protective cover box 4 on the side plates 2 and bottom frame plate 3.

[0053] Refer to Figure 4. Figure 5 and Figure 13 The upper and lower limit sliding connections of the inner wall of the protective cover box 4 are connected with a sealing pressure plate 10. A notch 13 is opened in the middle of the sealing pressure plate 10 to facilitate the maintenance of the electrical appliances and structures in the protective cover box 4. The notch area of ​​the notch 13 is equal to the notch area of ​​the bottom frame plate 3. When installed, the two notches are printed together, and a rubber pad is provided on the outer wall of the sealing pressure plate 10 to prevent water stains and dust from entering the wiring terminals inside the bottom frame plate 3 from between the sealing pressure plate 10 and the bottom frame plate 3.

[0054] Key References Figure 13 and Figure 14A second threaded rod 14 is connected between the inner top of the protective cover box 4 and the horizontal plates of the two L-shaped pressure plates 6 for limited rotation. The sealing pressure plate 10 is threadedly connected to the outer walls of the two second threaded rods 14. Rotating the two second threaded rods 14 can securely mount the sealing pressure plate 10 and the horizontal plates of the L-shaped pressure plate 6 to the side plates 2 and bottom frame 3.

[0055] Key References Figure 13 and Figure 14 The inner walls on both sides of the protective cover box 4 are fixedly connected with fixed bearing seats 15, and the tops of the two fixed bearing seats 15 are limited and rotatably connected to the first rotating column 19. The top axes of the two first rotating columns 19 are fixedly connected with spline shafts 25. The tops of the two spline shafts 25 are limited and rotatably connected to the top of the protective cover box 4. The two spline shafts 25 are fixedly connected to the outer walls of the spline shafts through the toothed belts and gears together with the synchronous toothed belt 9, which is used to keep the two spline shafts 25 and the first rotating column 19 rotating synchronously, and the outer walls of the two spline shafts 25 are limited and slidably connected with the spline sleeves 26, and the outer walls of the spline sleeves 26 are limited and rotatably connected with the auxiliary bearing seat 23. The auxiliary bearing seat 23 is limited and slidably connected to the inner wall of the protective cover box 4, and two hydraulic cylinders 24 are fixedly installed on the protective cover box 4. The bottom telescopic ends of the two hydraulic cylinders 24 are respectively connected to the two auxiliary bearing seats 23, which are used to drive the auxiliary bearing seats 23 The outer wall of the spline sleeve 26 is fixedly connected to the second gear 27 when moving up and down.

[0056] With particular reference to FIG. 13 and FIG. 14 , the outer walls of the two second threaded rods 14 are fixedly connected with the first gears 18 , and the two second gears 27 can be meshed with the two first gears 18 , respectively.

[0057] With particular reference to FIG1 , a motor 38 is fixedly mounted on the top of the protective cover box 4 , and a power output end of the motor 38 is connected to one of the spline shafts 25 .

[0058] Focusing on FIG. 2 , a motor protection cover 39 is fixedly mounted on the top of the protection cover box 4 , and the motor 38 is placed in the motor protection cover 39 . The outer wall of the motor protection cover 39 is provided with heat dissipation holes, and sponges are provided in the heat dissipation holes.

[0059] With particular reference to FIG. 6 , FIG. 7 and FIG. 13 , second line holes 16 are provided on both sides of the sealing pressing plate 10 , and first line holes 12 are provided on the transverse plate of the L-shaped pressing plate 6 .

[0060] With particular reference to Figures 6, 7, and 13, the wires on the terminals on the oil-immersed transformer body 1 pass through second wire holes 16 and first wire holes 12 to connect to external circuits. Both second wire holes 16 and first wire holes 12 are equipped with rubber blocks, each with a hole in its center for connecting to the external circuit.

[0061] With particular reference to FIG1 , a desiccant may also be installed in the protective cover box 4 to prevent moisture from affecting the wiring terminals.

[0062] Embodiment 2: Based on embodiment 1, technical means are added to facilitate quick maintenance of the electrical components and structures inside the protective cover box 4 on the basis of the protective cover box 4 being stably installed on the side panels 2 and the bottom frame plate 3, technical means are added to prevent the electrical components and structures inside the protective cover box 4 from being opened at will and causing danger, and technical means are added to prevent the electrical components or structures inside the protective cover box 4 from being stolen.

[0063] With particular reference to Figures 13 and 14, each first rotating column 19 is connected to two L-shaped bearing seats 22 for limited rotation, and the first rotating column 19 is connected to the horizontal plate of the L-shaped bearing seat 22 for limited rotation, the L-shaped bearing seat 22 is fixedly mounted on the protective cover box 4, and the vertical plate of the L-shaped bearing seat 22 is connected to the first threaded rod 11 for limited rotation, one end of the first threaded rod 11 is fixedly connected to the first bevel gear 20, and the first rotating column 19 is fixedly mounted with a second bevel gear 21 that engages with the first bevel gear 20, and the outer walls of the two first threaded rods 11 on the same side are commonly threadedly connected to the limited slide 8, and the two limited slides 8 are connected to the inner wall of the protective cover box 4 for limited sliding front and rear, and the two limited slides 8 are fixedly connected to the connecting plate 17, and the two connecting plates 17 are commonly fixedly connected to the sealing baffle 7 on the side away from the limiting slide 8, and the outer wall of the sealing baffle 7 is provided with a rubber pad layer, and the sealing baffle 7 The movement can press on the inner wall of the protective cover box 4 and block the operation opening 5.

[0064] The other structures are the same as those in the first embodiment.

[0065] Embodiment 3: Based on embodiment 2, technical means are added to protect electricity safety and prevent maintenance personnel from causing electrical hazards.

[0066] With particular reference to Figures 8, 9, 10, 11, 12, and 13, the two limiting slides 8 are fixedly mounted with a first sleeve 28 on one side close to the sealing baffle 7. A first slide 29 is slidingly connected in a limited manner in the first sleeve 28. A first elastic member 32 is fixedly connected between the first slide 29 and the inner bottom of the first sleeve 28. A plurality of first matching conductive protrusions 33 are fixedly connected to the side of the first slide 29 away from the first sleeve 28. The plurality of first matching conductive protrusions 33 are connected to the plurality of wiring terminals of the oil-immersed transformer body 1 through wires, so that the wiring terminals of the oil-immersed transformer body 1 can be connected to the external circuit. Two sleeves 30 are fixedly mounted on the inner wall of the side wall of the protective cover box 4 on which the operating port 5 is provided. The first slide 29 can be slidingly connected in the sleeve 30, and the sleeve 30 groove is provided with a second matching conductive groove 36 having the same number as the first matching conductive protrusion 33. The multiple first mating conductive protrusions 33 are respectively electrically connected to the multiple second mating conductive grooves 36. The multiple second mating conductive grooves 36 are each provided with an auxiliary circuit 35, so that the multiple first mating conductive protrusions 33 are respectively connected to the multiple auxiliary circuits 35. The multiple auxiliary circuits 35 are installed on the wire connection block 31 on the side away from the second mating conductive grooves 36. The wire connection block 31 is installed with the same number of external circuits as the auxiliary circuits 35. The external circuits pass through the second wire holes 16 on the sealing pressure plate 10 and through the first wire holes 12 on the L-shaped pressure plate 6.

[0067] With particular reference to Figures 8, 9, 10, 11, 12, and 13, a second elastic member 34 is connected between the sleeve plate 30 and the wire terminal block 31. The wire terminal block 31 is slidably connected to the protective cover box 4 with upper and lower limits. There are at least two second elastic members 34. Note that both the second wire hole 16 and the first wire hole 12 are equipped with rubber blocks. The center of the rubber blocks has a hole for the external circuit. This rubber block restrains the external circuit to prevent it from moving easily.

[0068] The other structures are the same as those in the second embodiment.

[0069] In this embodiment, the oil-immersed transformer body 1 is first fixed to the required position, and then the L-shaped pressure plate 6 at the bottom of the protective cover box 4 is moved downward from the outer wall of the side of the bottom frame plate 3 without the side plate 2, and then the protective cover box 4 is rotated so that the horizontal plates of the two L-shaped pressure plates 6 are placed at the bottom of the two side plates 2.

[0070] At this point, the sealing baffle 7 approaches the observation window 37, activating the hydraulic cylinder 24 to engage the second gear 27 with the first gear 18. The motor 38 is then activated to rotate the spline shaft 25 and the first rotating column 19. Driven by the timing belt 9, the two spline shafts 25 and the first rotating column 19 rotate synchronously. The two second gears 27 drive the two first gears 18 and the second threaded rod 14 in a circular rotation, moving the sealing pressure plate 10 downward. This allows the sealing pressure plate 10 and the crossbar of the L-shaped pressure plate 6 to clamp the side panels 2 and bottom frame 3 securely. The rubber pads on the side panels 2, bottom frame 3, and sealing pressure plate 10 prevent water and dust from entering the bottom frame 3 through the gaps between the side panels 2, bottom frame 3, and sealing pressure plate 10. The above-mentioned protective cover box 4 is fixedly installed on the side plate 2 and the bottom frame plate 3, thereby protecting the wiring terminals of the oil-immersed transformer body 1 from moisture or contamination and protecting the wiring terminals from being accidentally touched.

[0071] After completing the above steps, the operator passes his hand through the operation port 5, allowing the external circuit to pass through the second wire hole 16 and the first wire hole 12, and then connect to the wire terminal block 31. Then, the circuits at the multiple first matching conductive protrusions 33 are connected to the multiple terminal blocks on the oil-immersed transformer body 1, thereby completing the assembly of the internal circuit.

[0072] Then, hydraulic cylinder 24 is activated, disengaging second gear 27 from first gear 18. Motor 38 is then activated, causing second bevel gear 21 to resume meshing with first bevel gear 20, causing limit slide 8, connecting plate 17, and sealing baffle 7 to move toward the front inner wall of protective cover box 4. The rubber padding on the outer wall of sealing baffle 7 securely seals operating opening 5. Since the seal is sealed from the inner wall, it prevents outsiders from knocking open protective cover box 4, providing a theft-proofing effect. This seals operating opening 5, maintaining a stable operating state for the device.

[0073] When maintenance is required on the electrical components within the protective cover box 4 or changes are required to the wiring terminals or other circuits, the motor 38 is started and reversed so that the sealing baffle 7 no longer blocks the operation opening 5. The maintenance personnel can insert their arms or upper body through the operation opening 5 to perform maintenance work.

[0074] When the sealing baffle 7 does not block the operating port 5 , the first matching conductive protrusion 33 loses electrical connection with the second matching conductive groove 36 . At this time, external electricity cannot enter the oil-immersed transformer body 1 , thereby facilitating maintenance of the oil-immersed transformer body 1 and other structures within the protective cover box 4 .

[0075] When the sealing baffle 7 blocks the operation port 5 , the first matching conductive protrusion 33 is electrically connected to the second matching conductive groove 36 , thereby facilitating the use of the oil-immersed transformer body 1 .

[0076] This prohibits maintenance personnel from working with power on at the source, thus protecting their safety.

[0077] When the operation opening 5 is smashed open by a heavy object, the electrical connection of the oil-immersed transformer body 1 is immediately stopped, thereby preventing the oil-immersed transformer body 1 from causing electric shock to personnel and preventing the oil-immersed transformer body 1 from being damaged and causing electrical hazards.

[0078] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A 20KV oil-immersed transformer, characterized in that: include: An oil-immersed transformer body (1), a cover assembly mounted on the top of the oil-immersed transformer body (1), the cover assembly protecting the connection terminals of the oil-immersed transformer body (1); The cover assembly comprises a bottom frame plate (3) and a protective cover box (4) with an opening at the bottom, wherein the bottom frame plate (3) is fixedly mounted on the top of the oil-immersed transformer body (1), and the connection terminals of the oil-immersed transformer body (1) are placed in the bottom frame plate (3); An operating opening (5) is provided on one side of the protective cover box (4), and a sealing baffle (7) is provided inside the protective cover box (4). The protective cover box (4) is first fixedly mounted on the bottom frame plate (3) by a driving mechanism, and then the sealing baffle (7) seals and blocks the operating opening (5). The driving mechanism includes side plates (2), the outer walls on both sides of the bottom frame plate (3) are fixedly connected to the side plates (2), the bottoms on both sides of the protection cover box (4) are fixedly connected to L-shaped pressure plates (6), the two L-shaped pressure plates (6) can reach the bottoms of the side plates (2) from the sides of the bottom frame plate (3), the inner wall of the protection cover box (4) is connected to a sealing pressure plate (10) in an upper and lower limited sliding manner, the middle part of the sealing pressure plate (10) is provided with a notch (13) for facilitating maintenance of the electrical appliances and structures in the protection cover box (4), the protection cover box (4) and the two L-shaped pressure plates (6) are both connected to a second threaded rod (14) in a limited rotation manner, and the sealing pressure plate (10) is threadedly connected to the outer walls of the two second threaded rods (14); It also includes a rotating mechanism, which causes the two second threaded rods (14) to rotate synchronously, thereby allowing the sealing pressure plate (10) and the L-shaped pressure plate (6) to be clamped on the top and bottom of the side plate (2), completing the rapid installation of the protective cover box (4) and the side plate (2) and the bottom frame plate (3); It also includes a lateral movement mechanism, which enables the sealing baffle (7) to seal the operating port (5).

2. A 20KV oil-immersed transformer according to claim 1, characterized in that: The driving mechanism enables the protective cover box (4) to be stably and sealedly mounted on the bottom frame plate (3) to open the operating opening (5), thereby facilitating maintenance of electrical appliances and structures in the protective cover box (4) from the operating opening (5). When the sealing baffle (7) is sealedly mounted on the operating opening (5), the wiring terminals of the oil-immersed transformer body (1) and the corresponding wires are electrically connected through the electrical protection mechanism. When the sealing baffle (7) is away from the operating opening (5), the electrical protection mechanism disconnects the wiring terminals of the oil-immersed transformer body (1) and the corresponding wires, and can prevent externally connected lines from being pulled, thereby enabling the device to be used stably, safely and quickly.

3. A 20KV oil-immersed transformer according to claim 2, characterized in that: The rotating mechanism comprises two fixed bearing seats (15), the two fixed bearing seats (15) are respectively fixedly mounted on the inner walls of both sides of the protective cover box (4), the two fixed bearing seats (15) are both connected to the first rotating column (19) in a limited rotation manner, the top axis of the two first rotating columns (19) are both fixedly connected to the spline shaft (25), the top of the two spline shafts (25) are connected to the top of the protective cover box (4) in a limited rotation manner, the toothed belt fixedly connected to the outer wall of the two spline shafts (25) is matched with the gear and is covered with a synchronous toothed belt (9) for keeping the two spline shafts (25) and the first rotating column (19) rotating synchronously, and the outer walls of the two spline shafts (25) are both connected to the spline sleeve (26) in an upper and lower limited sliding manner, and the outer wall of the spline sleeve (26) is limited to rotate. An auxiliary bearing seat (23) is connected, and the auxiliary bearing seat (23) is slidably connected to the protective cover box (4) with upper and lower limit limits, and two hydraulic cylinders (24) are fixedly installed on the protective cover box (4), and the bottom telescopic ends of the two hydraulic cylinders (24) are respectively connected to the two auxiliary bearing seats (23) for driving the auxiliary bearing seat (23) to move up and down, and the outer wall of the spline sleeve (26) is fixedly connected to the second gear (27), and the outer walls of the two second threaded rods (14) are fixedly connected to the first gear (18), and the two second gears (27) can be respectively engaged with the two first gears (18), and the synchronously rotating second threaded rods (14) stably drive the sealing pressure plate (10) and the L-shaped pressure plate (6) to cooperate to firmly install the protective cover box (4) on the side plate (2) and the bottom frame plate (3); A motor (38) is fixedly mounted on the protective cover box (4), and a power output end of the motor (38) is connected to one of the spline shafts (25).

4. A 20KV oil-immersed transformer according to claim 3, characterized in that: The lateral movement mechanism includes an L-shaped bearing seat (22), each of the first rotating columns (19) is connected to two L-shaped bearing seats (22) in a limited rotation manner, the L-shaped bearing seats (22) are fixedly mounted on the protective cover box (4), and the L-shaped bearing seat (22) is connected to a first threaded rod (11) in a limited rotation manner, one end of the first threaded rod (11) is fixedly connected to a first bevel gear (20), and a second bevel gear (21) engaged with the first bevel gear (20) is fixedly mounted on the first rotating column (19), and the outer walls of the two first threaded rods (11) on the same side are commonly threadedly connected to a limited slide plate (8), the two limited slide plates (8) are connected to the inner wall of the protective cover box (4) in a front-rear limited sliding manner, and the two limited slide plates (8) are fixedly connected to a connecting plate (17), and the two connecting plates (17) are commonly fixedly connected to a sealing baffle (7) on the side away from the limiting slide plate (8), and the movement of the sealing baffle (7) can block the operation port (5).

5. A 20KV oil-immersed transformer according to claim 3, characterized in that: A motor protection cover (39) is installed on the protection cover box (4), and the motor (38) is placed in the motor protection cover (39).

6. A 20KV oil-immersed transformer according to claim 4, characterized in that: An observation window (37) is provided on a side of the protective cover box (4) away from the operation opening (5).

7. A 20KV oil-immersed transformer according to claim 6, characterized in that: The electric protection mechanism includes a first sliding sleeve (28), and the first sliding sleeve (28) is fixedly installed on one side of the two limiting sliding plates (8) close to the sealing baffle (7). The first sliding plate (29) is slidingly connected to the first sliding plate (28). A first elastic member (32) is fixedly connected between the first sliding plate (29) and the inner bottom of the first sliding sleeve (28). A plurality of first matching conductive protrusions (33) are fixedly connected to the side of the first sliding plate (29) away from the first sliding sleeve (28). The plurality of first matching conductive protrusions (33) are respectively connected to the plurality of wiring terminals of the oil-immersed transformer body (1) through a plurality of wires, so that the wiring terminals of the oil-immersed transformer body (1) can be connected to the external circuit. Two sleeve plates (30) are fixedly installed on the inner wall of the side wall of the protection cover box (4) on which the operation operation port (5) is provided. The first sliding plate (29) can be slidingly connected to the sleeve plate (30). The sleeve plate (30) is provided with a second matching conductive groove (36) having the same number as the first matching conductive protrusions (33) in the groove, and the plurality of the first matching conductive protrusions (33) are respectively matched and electrically connected with the plurality of the second matching conductive grooves (36), and the plurality of the second matching conductive grooves (36) are each provided with an auxiliary circuit (35), so that the plurality of the first matching conductive protrusions (33) are respectively connected with the plurality of auxiliary circuits (35), and the plurality of the auxiliary circuits (35) are installed on the wire terminal block (31) on the side away from the second matching conductive grooves (36), and the wire terminal block (31) is provided with external circuits having the same number as the auxiliary circuits (35) and being connected, and the external circuits pass through the second wire hole (16) on the sealing pressure plate (10) and the first wire hole (12) on the L-shaped pressure plate (6), and an anti-circuit pulling mechanism is also connected between the sleeve plate (30) and the wire terminal block (31).

8. A 20KV oil-immersed transformer according to claim 7, characterized in that: The anti-line pulling mechanism comprises a second elastic member (34), the second elastic member (34) is connected between the sleeve plate (30) and the wire connection block (31), and the number of the second elastic members (34) is at least two.

9. The 20KV oil-immersed transformer according to claim 8, characterized in that: It also includes a controller and a battery. The controller is electrically connected to the battery, the motor (38), and the hydraulic cylinder (24) and is used to control the operation of the device.

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