A large-current glass steel dry type bushing

Abstract

This utility model relates to a high-current fiberglass dry bushing, comprising a mandrel, a core body fitted onto the mandrel, and a first flange bonded to the outer wall of the core body. A second flange is welded and fixed to one end of the mandrel. A porcelain sleeve, sealing the first and second flanges, is fitted onto the core body. An oil drain port is provided on the outer circumference of the second flange. An oil inlet port is provided at the other end of the mandrel. An oil groove formed on the outer wall of the mandrel is fitted onto the inner wall of the core. A through groove communicating with the oil inlet port and the oil groove is provided inside the mandrel. The gap between the porcelain sleeve and the core body and the oil groove are connected through the gap between the core body and the second flange. An oil guide hole communicating with the gap between the porcelain sleeve and the core body is provided in the oil drain port. This utility model not only facilitates the entry of current from external high-voltage lines into the transformer for voltage ratio adjustment but also provides heat dissipation during current flow, increasing the current carrying capacity of the device during use.

Description

Technical Field

[0001] This utility model relates to the field of power transmission equipment technology, specifically to a high-current fiberglass dry bushing. Background Technology

[0002] With the rapid development of power systems, transformers, as the core equipment for power conversion and transmission, have increasingly diversified requirements for bushing technology. Traditional high-current fiberglass dry bushings are widely used in distribution transformers of various voltage levels due to their advantages such as light weight, high mechanical strength, and resistance to pollution, undertaking the tasks of conduction and insulation.

[0003] However, in current technology, high-current fiberglass dry bushings used to connect high-voltage leads to the transformer body are prone to localized overheating during practical applications. Furthermore, traditional high-current fiberglass dry bushings employ a closed structure, which makes it difficult for heat to dissipate effectively, accelerating the aging of the insulating oil and ultimately reducing the current carrying capacity of the device during operation. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a high-current fiberglass dry bushing that not only facilitates the entry of current from external high-voltage lines into the transformer and adjusts the voltage ratio, but also dissipates heat during current flow, thereby increasing the current carrying capacity of the device during use.

[0005] This utility model is achieved through the following technical solution: a high-current fiberglass dry bushing is provided, including a mandrel, a core body sleeved on the mandrel, and a first flange glued to the outer wall of the core body. A second flange is welded and fixed to one end of the mandrel. A ceramic sleeve that seals with the first and second flanges is sleeved on the core body. An oil drain port is opened on the outer circumferential surface of the second flange. An oil inlet port is opened at the other end of the mandrel. An oil groove opened on the outer wall of the mandrel is fitted on the inner wall of the core body. A through groove is provided in the mandrel that communicates with the oil inlet port and the oil groove respectively. The gap between the ceramic sleeve and the core body and the oil groove are connected through the gap between the core body and the second flange. An oil guide hole is provided in the oil drain port that communicates with the gap between the ceramic sleeve and the core body.

[0006] In use, this invention comprises a mandrel, a core body fitted onto the mandrel, and a first flange glued to the outer wall of the core body. A second flange is welded to one end of the mandrel. A porcelain sleeve, sealing the first and second flanges, is fitted onto the core body. An oil drain port is located on the outer circumference of the second flange. An oil inlet port is located at the other end of the mandrel. An oil groove, located on the outer wall of the mandrel, is fitted onto the inner wall of the core. A through groove, communicating with both the oil inlet port and the oil groove, is located inside the mandrel. The gap between the porcelain sleeve and the core body, and the oil groove, are connected through the gap between the core body and the second flange. An oil guide hole, communicating with the gap between the porcelain sleeve and the core body, is located in the oil drain port. During use, the device needs to be placed inside a transformer, immersing it in the transformer oil. The first flange inside the device is then fixed to the transformer riser. The leads inside the transformer are connected to the end of the mandrel inside the device furthest from the second flange. An external high-voltage... The pressure wire is connected to the side wall of the second flange inside the device, away from the core rod. During the process of immersing the device in the transformer oil, the oil in the transformer enters the through groove inside the core rod through the oil inlet, and then enters the oil groove, the gap between the core and the second flange, and the gap between the porcelain bushing and the core. Finally, it flows out through the oil guide hole into the oil drain channel, thus filling the through groove and oil groove on the core rod, the gap between the core and the second flange, and the gap between the porcelain bushing and the core. The transformer oil continuously flows through the oil inlet and drain to fill the through groove and oil groove on the core rod, the gap between the core and the second flange, and the gap between the porcelain bushing and the core. Then, the operator energizes the device to allow the current to enter the transformer, thereby adjusting the voltage ratio. This not only facilitates the entry of current from the external high-voltage line into the transformer to adjust the voltage ratio, but also dissipates heat during the current flow process, increasing the current carrying capacity of the device during use.

[0007] Preferably, four first terminals are fixedly connected to the side wall of the second flange away from the mandrel, equidistantly distributed circumferentially, and a second terminal is fixedly connected to the end face of the mandrel away from the second flange. By fixing the four first terminals to the side wall of the second flange away from the mandrel equidistantly distributed circumferentially, and the second terminal to the end face of the mandrel away from the second flange, it is convenient for workers to connect the leads inside the transformer to the end of the mandrel inside the device away from the second flange, and to connect external high-voltage lines to the side wall of the second flange inside the device away from the mandrel.

[0008] Preferably, the core includes an aluminum tube sleeved on a mandrel, with a fiberglass core sleeved on the outer wall of the aluminum tube. The combination of the aluminum tube and the fiberglass core increases the current carrying capacity of the core during use.

[0009] Preferably, a first sealing ring and a second sealing ring, which are fixed to the outer wall of the aluminum tube, are respectively attached to both ends of the fiberglass core. By attaching the first sealing ring and the second sealing ring, which are fixed to the outer wall of the aluminum tube, transformer oil can be prevented from entering the gap between the fiberglass core and the aluminum tube during use.

[0010] Preferably, a first locking nut is provided between the fiberglass core and the second flange, which is threaded to the outer wall of the aluminum tube. The first sealing ring is fixed to the outer wall of the aluminum tube by the first locking nut. By providing a first locking nut between the fiberglass core and the second flange, which is threaded to the outer wall of the aluminum tube, and fixing the first sealing ring to the outer wall of the aluminum tube by the first locking nut, the stability between the first sealing ring and the aluminum tube can be improved during use.

[0011] Preferably, the fiberglass core has a first pressure block that is circumferentially closed and fits against the outer wall of the aluminum tube on the end face away from the second flange. A second pressure block that is circumferentially closed is fixed to the side wall of the first pressure block away from the second flange by a spring. The second pressure block presses against the side wall of the aluminum tube away from the second flange. A second fastening nut is provided on the outer wall of the core rod. A second bolt is provided on the second fastening nut that presses against the side wall of the second pressure block away from the first pressure block. The second sealing ring is fixed to the outer wall of the aluminum tube by the second bolt, the second fastening nut, the first pressure block, the spring, and the second pressure block. A first pressure block, which is circumferentially closed and fits against the outer wall of the aluminum tube, is provided on the end face of the fiberglass core away from the second flange. A second pressure block, which is circumferentially closed, is fixed on the side wall of the first pressure block away from the second flange by a spring. The second pressure block presses against the side wall of the aluminum tube away from the second flange. A second fastening nut is provided on the outer wall of the mandrel. A second bolt is provided on the second fastening nut, which presses against the side wall of the second pressure block away from the first pressure block. The second sealing ring is fixed to the outer wall of the aluminum tube by the second bolt, the second fastening nut, the first pressure block, the spring, and the second pressure block. This not only improves the stability between the second sealing ring and the aluminum tube during use, but also uses the elastic force of the spring to make the second fastening nut, the first pressure block, the second pressure block, the mandrel, and the core body in close contact, achieving equipotential bonding.

[0012] Preferably, a third sealing ring is fitted onto the inner wall of the first flange, abutting against the outer wall of the fiberglass core; a fourth sealing ring is fitted onto the side wall of the second flange away from the first terminal, abutting against the side wall of the porcelain bushing away from the first flange; and a fifth sealing ring is fitted onto the side wall of the first flange facing the second flange, abutting against the side wall of the porcelain bushing away from the second flange. By using the third sealing ring on the inner wall of the first flange, the fourth sealing ring on the side wall of the second flange away from the first terminal, and the fifth sealing ring on the side wall of the first flange facing the second flange, transformer oil leakage from the device can be prevented during operation.

[0013] Preferably, both the sidewall of the first pressure block away from the second flange and the sidewall of the second pressure block facing the second flange are provided with grooves adapted to the spring. By providing grooves adapted to the spring on both the sidewall of the first pressure block away from the second flange and the sidewall of the second pressure block facing the second flange, the stability of the spring during use can be improved.

[0014] Preferably, the fiberglass core is formed by high-temperature winding of glass fiber and epoxy resin. By making the fiberglass core by high-temperature winding of glass fiber and epoxy resin, the current carrying capacity of the core during use can be increased.

[0015] Preferably, an equipotential contact is provided at the bottom of the oil tank, pressing against the inner wall of the aluminum tube. By providing an equipotential contact at the bottom of the oil tank, an equipotential connection between the mandrel and the aluminum tube can be achieved.

[0016] The beneficial effects of this utility model are as follows: By setting a core rod, a core body fitted onto the core rod, and a first flange glued to the outer wall of the core body, a second flange is welded and fixed to one end of the core rod. A porcelain sleeve that seals with the first and second flanges is fitted onto the core body. An oil drain port is opened on the outer circumferential surface of the second flange. An oil inlet port is opened at the other end of the core rod. An oil groove is fitted onto the inner wall of the core rod, and a through groove communicating with the oil inlet and the oil groove is provided inside the core rod. The gap between the porcelain sleeve and the core body and the oil groove are connected through the gap between the core body and the second flange. An oil guide hole communicating with the gap between the porcelain sleeve and the core body is provided in the oil drain port. When using the device, it needs to be placed inside the transformer, immersing the device in the transformer oil. The first flange inside the device is fixed to the transformer riser. The leads inside the transformer are connected to the end of the core rod inside the device away from the second flange. The external high-voltage... The pressure wire is connected to the side wall of the second flange inside the device, away from the core rod. During the process of immersing the device in the transformer oil, the oil in the transformer enters the through groove inside the core rod through the oil inlet, and then enters the oil groove, the gap between the core and the second flange, and the gap between the porcelain bushing and the core. Finally, it flows out through the oil guide hole into the oil drain channel, thus filling the through groove and oil groove on the core rod, the gap between the core and the second flange, and the gap between the porcelain bushing and the core. The transformer oil continuously flows through the oil inlet and drain to fill the through groove and oil groove on the core rod, the gap between the core and the second flange, and the gap between the porcelain bushing and the core. Then, the operator energizes the device to allow the current to enter the transformer, thereby adjusting the voltage ratio. This not only facilitates the entry of current from the external high-voltage line into the transformer to adjust the voltage ratio, but also dissipates heat during the current flow process, increasing the current carrying capacity of the device during use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a perspective view of the structure of this utility model; Figure 3 for Figure 2 Schematic diagram of part A in the middle; Figure 4 for Figure 2 Schematic diagram of Part B in the middle section; Figure 5 for Figure 2 Schematic diagram of the structure of part C; As shown in the figure: 1. First terminal block, 2. Second flange, 3. Porcelain sleeve, 4. First flange, 5. Fiberglass, 6. First pressure block, 7. Second pressure block, 8. Second fastening lock nut, 9. Spring, 10. Core rod, 11. Second terminal block, 12. Second bolt, 13. First fastening lock nut, 14. Oil groove, 15. Aluminum tube, 16. Through groove, 17. Oil inlet, 18. First sealing ring, 19. Oil guide hole, 20. Oil drain, 21. First bolt, 22. Fourth sealing ring, 23. Third sealing ring, 24. Fifth sealing ring, 25. Second sealing ring, 26. Countersunk groove, 27. Equipotential contact. Detailed Implementation

[0018] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0019] like Figures 1-5 The high-current fiberglass dry bushing of this utility model includes a mandrel 10, a core body sleeved on the mandrel 10, and a first flange 4 glued to the outer wall of the core body. A second flange 2 is welded and fixed to one end of the mandrel 10. A ceramic sleeve 3 is sleeved on the core body and seals with the first flange 4 and the second flange 2. An oil drain port 20 is opened on the outer circumferential surface of the second flange 2. An oil inlet port 17 is opened at the other end of the mandrel 10. An oil groove 14 is provided on the inner wall of the core body and is provided on the outer wall of the mandrel 10. A through groove 16 is provided in the mandrel 10, which is respectively connected to the oil inlet port 17 and the oil groove 14. The gap between the ceramic sleeve 3 and the core body and the oil groove 14 are connected through the gap between the core body and the second flange 2. An oil drain port 20 is provided with an oil guide hole 19 that is connected to the gap between the ceramic sleeve 3 and the core body.

[0020] Four first terminals 1 are fixedly connected to the side wall of the second flange 2 away from the core rod 10, distributed circumferentially at equal intervals. A second terminal 11 is fixedly connected to the end face of the core rod 10 away from the second flange 2. The first and second terminals 11 facilitate the connection of the transformer leads to the end of the core rod 10 away from the second flange 2, and the connection of external high-voltage lines to the side wall of the second flange 2 away from the core rod 10. The core includes an aluminum tube 15 sleeved on the core rod 10, and a fiberglass core is sleeved on the outer wall of the aluminum tube 15. The aluminum tube 15 and the fiberglass core can improve the current carrying capacity of the core during use. A first sealing ring 18 and a second sealing ring 25 are respectively attached to both ends of the fiberglass core and fixed to the outer wall of the aluminum tube 15. The first sealing ring 18 and the second sealing ring 25 can prevent transformer oil from entering the gap between the fiberglass core and the aluminum tube 15 during use. By providing a first fastening nut 13 that is threaded to the outer wall of the aluminum tube 15 between the fiberglass core and the second flange 2, the first sealing ring 18 is fixed to the outer wall of the aluminum tube 15 through the first fastening nut 13. The stability between the first sealing ring 18 and the aluminum tube 15 can be improved when the device is in use by using the first fastening nut 13. A first pressure block 6, which is circumferentially closed and fits against the outer wall of the aluminum tube 15, is provided on the end face of the fiberglass core away from the second flange 2. A second pressure block 7, which is circumferentially closed, is fixed on the side wall of the first pressure block 6 away from the second flange 2 by a spring 9. The second pressure block 7 presses against the side wall of the aluminum tube 15 away from the second flange 2. A second fastening nut 8 is provided on the outer wall of the mandrel. A second bolt 12 is provided on the second fastening nut 8, which presses against the side wall of the second pressure block 7 away from the first pressure block 6. The second sealing ring 25 is fixed to the outer wall of the aluminum tube 15 by the second bolt 12, the second fastening nut 8, the first pressure block 6, the spring 9, and the second pressure block 7. This not only improves the stability between the second sealing ring 25 and the aluminum tube 15 during use, but also uses the elastic force of the spring 9 to make the second fastening nut 8, the first pressure block 6, the second pressure block 7, the mandrel 10, and the core body in close contact, so as to achieve equipotential connection. A third sealing ring 23 is fitted onto the inner wall of the first flange 4 to abut against the outer wall of the fiberglass core; a fourth sealing ring 22 is fitted onto the side wall of the second flange 2 away from the first terminal 1 to abut against the side wall of the porcelain sleeve 3 away from the first flange 4; and a fifth sealing ring 24 is fitted onto the side wall of the first flange 4 facing the second flange 2 to abut against the side wall of the porcelain sleeve 3 away from the second flange 2. These three sealing rings prevent transformer oil from leaking out of the device during use. Furthermore, grooves 26, adapted to the spring 9, are provided on both the side wall of the first pressure block 6 away from the second flange 2 and the side wall of the second pressure block 7 facing the second flange 2. These grooves 26 improve the stability of the spring 9 during use.By making the fiberglass core body by high-temperature winding of glass fiber 5 and epoxy resin, the current carrying capacity of the core body during use can be improved. An equipotential contact 27 is provided at the bottom of the oil tank 14, pressing against the inner wall of the aluminum tube 15. The equipotential contact 27 enables equipotential connection between the core rod 10 and the aluminum tube 15. By using an aluminum rod as the core rod 10, the diameter of the aluminum rod is smaller under the same current carrying capacity, facilitating device assembly. First bolts 21 are provided at both the oil inlet 17 and the oil outlet 20. These first bolts 21 prevent dust from entering the through groove 16 on the core rod 10, the oil tank 14, the gap between the core body and the second flange 2, and the gap between the ceramic sleeve 3 and the core body when the device is not in use. The high temperature required for fiberglass and epoxy resin to be wound into a fiberglass core is 90~120℃. The number of layers required for the fiberglass and epoxy resin to be wound into a fiberglass core is generally arranged according to the voltage level and field strength. Each layer is not less than 3mm thick, and 4-6 layers can be set.

[0021] Combined with appendix Figure 1-5 The method of using this utility model is as follows: First, the first bolt 21 needs to be rotated to unscrew it from the oil inlet 17 and the oil outlet. Then, the device is placed inside the transformer, immersing it in the oil. The first flange 4 inside the device is fixed to the transformer riser. The lead wire inside the transformer is connected to the end of the core rod 10 inside the device away from the second flange 2 through the second terminal 11. The external high-voltage line is connected to the side wall of the second flange 2 inside the device away from the core rod 10 through the first terminal 1. During the process of immersing the device in the transformer oil, the oil inside the transformer enters the through groove 16 inside the core rod 10 through the oil inlet 17 and flows out from the through groove 16. The oil enters the oil tank 14, the gap between the core and the second flange 2, and the gap between the porcelain sleeve 3 and the core. Finally, it flows out through the oil guide hole 19 into the drain port 20 channel. This fills the through groove 16 on the core rod 10, the oil tank 14, the gap between the core and the second flange 2, and the gap between the porcelain sleeve 3 and the core. The transformer oil continuously flows through the oil inlet 17 and the oil outlet 20 to fill the through groove 16 on the core rod 10, the oil tank 14, the gap between the core and the second flange 2, and the gap between the porcelain sleeve 3 and the core. Then, the operator turns on the power so that the current enters the device from the external high-voltage line through the first terminal 1, and enters the transformer through the second terminal 11 and the lead wire, thereby adjusting the voltage ratio.

[0022] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A high current fiberglass dry-type bushing characterized by: The device includes a mandrel (10), a core body fitted on the mandrel, and a first flange (4) glued to the outer wall of the core body. A second flange (2) is welded and fixed to one end of the mandrel. A ceramic sleeve (3) that seals with the first flange and the second flange is fitted on the core body. An oil drain port (20) is provided on the outer circumferential surface of the second flange. An oil inlet port (17) is provided at the other end of the mandrel. An oil groove (14) provided on the outer wall of the mandrel is attached to the inner wall of the core body. A through groove (16) that communicates with the oil inlet port and the oil groove is provided inside the mandrel. The gap between the ceramic sleeve and the core body and the oil groove are connected through the gap between the core body and the second flange. An oil guide hole (19) that communicates with the gap between the ceramic sleeve and the core body is provided in the oil drain port.

2. The high current fiberglass dry-type bushing of claim 1, wherein: The second flange has four first terminals (1) fixedly connected to the side wall away from the mandrel, which are equidistantly distributed in the circumferential direction, and the mandrel has a second terminal (11) fixedly connected to the end face away from the second flange.

3. The high current fiberglass dry-type bushing of claim 1, wherein: The core includes an aluminum tube (15) sleeved on a mandrel, and a fiberglass core is sleeved on the outer wall of the aluminum tube.

4. The dry bushing of claim 3, wherein: The fiberglass core is fitted with a first sealing ring (18) and a second sealing ring (25) at both ends, which are fixed to the outer wall of the aluminum tube.

5. The high current fiberglass dry-type bushing of claim 4, wherein: A first fastening lock nut (13) is provided between the fiberglass core and the second flange and is threaded to the outer wall of the aluminum tube. The first sealing ring is fixed to the outer wall of the aluminum tube by the first fastening lock nut.

6. The high-current fiberglass dry bushing according to claim 4, characterized in that: The fiberglass core is provided with a first pressure block (6) that is circumferentially closed and fits against the outer wall of the aluminum tube at the end face away from the second flange. A second pressure block (7) that is circumferentially closed is fixed on the side wall of the first pressure block away from the second flange by a spring (9). The second pressure block presses against the side wall of the aluminum tube away from the second flange. A second fastening nut (8) is provided on the outer wall of the core rod. A second bolt (12) is provided on the second fastening nut that presses against the side wall of the second pressure block away from the first pressure block. The second sealing ring is fixed to the outer wall of the aluminum tube by the second bolt, the second fastening nut, the first pressure block, the spring, and the second pressure block.

7. The high-current fiberglass dry bushing according to claim 4, characterized in that: A third sealing ring (23) is attached to the inner wall of the first flange and abuts against the outer wall of the fiberglass core. A fourth sealing ring (22) is attached to the side wall of the second flange away from the first terminal and abuts against the side wall of the porcelain sleeve away from the first flange. A fifth sealing ring (24) is attached to the side wall of the first flange facing the second flange and abuts against the side wall of the porcelain sleeve away from the second flange.

8. The dry bushing of claim 6, wherein: The first pressure block has a groove (26) on the side wall away from the second flange and the second pressure block has a groove (26) on the side wall facing the second flange, which is adapted to the spring.

9. The dry type bushing of claim 4, wherein: The fiberglass core is made of glass fiber (5) and epoxy resin wound at high temperature.

10. The dry type bushing of claim 4, wherein: The bottom of the oil tank is provided with an equipotential contact (27) pressed against the inner wall of the aluminum tube.

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