Transformer lightning protection grounding device

Abstract

The utility model relates to grounding device technical field especially a transformer lightning protection grounding device, including the corresponding assembly frame and stand from top to bottom, the top of assembly frame is fixed from left to right and installed with disconnecting switch, lightning arrester and current transformer, the top of stand is fixedly connected with spliced column. The utility model has the advantages of: the design provides fixed support from the left and right ends of assembly frame through U type support, connecting plate, locking bolt, cooperates bolt connection of the shaft center part, forms '' multiple point fixed '' structure, solves the problem that only shaft center part is fixed and the left and right ends are not restrained of prior art device thoroughly, the cooperation of spline shaft and spline groove prevents the relative rotation of adapter frame and stand, positioning pin ensures assembly frame installation precision, stiffening plate promotes U type support bearing capacity, and multiple structures jointly resist wind force, snow load, avoid assembly frame sway and tilt, prevent clearance electrode position deviation, guarantee device lightning protection function stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of grounding device technology, and in particular to a transformer lightning protection grounding device. Background Technology

[0002] A neutral point gap grounding protection device is a specialized device used for lightning and overvoltage protection of equipment such as transformers and reactors in power systems. Its core components consist of a gap electrode, insulating support, assembly frame, grounding lead, and monitoring components (in some cases). Its working principle involves setting a specific gap between the equipment's neutral point and the grounding system. Under normal operation, the gap remains insulated, preventing circulating currents from forming at the neutral point and affecting system stability. When encountering abnormally high voltages such as lightning overvoltages or switching overvoltages, the gap breaks down, forming a temporary grounding path that quickly conducts the large current generated by the overvoltage to the ground, preventing high voltage from breaking down the equipment's insulation layer. After the overvoltage disappears, the gap automatically restores insulation, and the equipment returns to normal operation. Simultaneously, some devices' monitoring components can record the gap's operation, facilitating troubleshooting by maintenance personnel.

[0003] Existing neutral point gap grounding protection devices have significant structural design flaws. The most prominent drawback is that the assembly frame is only locked to the column by bolts at the central axis, lacking effective fixation at both ends, resulting in extremely poor stability. As the supporting framework of the device, the assembly frame must bear the weight of components such as the gap electrodes and insulating supports, and is exposed to the outdoors for extended periods, subjecting itself to stresses from wind, rain, snow, and temperature changes. The single-point bolt fixation at the central axis leaves the left and right ends of the assembly frame unrestrained, making it prone to swaying and tilting under wind conditions, leading to relative displacement of the gap electrodes. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to provide a transformer lightning protection grounding device to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, one embodiment of this utility model provides a transformer lightning protection grounding device, including an assembly frame and a column corresponding to each other. A disconnecting switch, a surge arrester, and a current transformer are sequentially fixedly installed on the top of the assembly frame from left to right. A splicing column is fixedly connected to the top of the column, and a transfer frame is slidably connected to the outer surface of the splicing column. The transfer frame is fixedly connected to the column by bolts. The assembly frame is fixedly installed on the top of the transfer frame by bolts. U-shaped brackets are fixedly installed on both the left and right sides of the transfer frame by bolts. A connecting plate is fixedly connected to the end of the U-shaped bracket away from the transfer frame. Both connecting plates are slidably connected to the assembly frame. A locking bolt is threaded to the top of each connecting plate, and the nuts of both locking bolts are abutted against the top surface of the assembly frame.

[0007] Preferably, in any of the above solutions, the top surface of the assembly frame has two symmetrically arranged connecting slots, and the two connecting plates are slidably connected to the assembly frame through the two connecting slots.

[0008] Preferably, in any of the above embodiments, the bottom surface of the adapter frame is provided with a splicing hole, the splicing post is inserted into the splicing hole, and the length of the splicing post is equal to the depth of the splicing hole.

[0009] Preferably, in any of the above embodiments, a spline shaft is fixedly connected to the top of the splicing column, a spline groove is provided inside the splicing hole, and the spline shaft is inserted into the spline groove.

[0010] Preferably, the bottom surface of the assembly frame is fixedly connected with a number of evenly distributed positioning pins, and the number of positioning pins are all inserted into one side of the adapter frame.

[0011] Preferably, in any of the above embodiments, the inner wall of each U-shaped bracket is fixedly connected with two symmetrically arranged stiffening plates, and both U-shaped brackets are located directly below the assembly frame.

[0012] Preferably, in any of the above solutions, the end of the U-shaped bracket away from the adapter frame has a threaded hole, and the nuts of the two locking bolts are in contact with the top surface of the assembly frame through the threaded hole.

[0013] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: 1. During assembly, first insert the splicing post at the top of the column into the splicing hole on the bottom of the adapter frame, so that the splined shaft is embedded in the spline groove. Fix the adapter frame to the column with bolts. Next, align the positioning pin on the bottom of the assembly frame with the adapter frame and insert it to initially position the assembly frame. Then, fix the assembly frame to the top of the adapter frame with bolts. Subsequently, install U-shaped brackets on both sides of the adapter frame with bolts, aligning the connecting plate at the end of the U-shaped bracket away from the adapter frame with the connecting groove on the top surface of the assembly frame. Finally, screw the locking bolts into the threaded holes of the connecting plate until the nut of the locking bolt is flush with the top surface of the assembly frame, completing the fixation of the U-shaped bracket and the assembly frame. At this point, the assembly frame is not only bolted to the adapter frame through the shaft, but the left and right ends are also auxiliaryly fixed to the adapter frame through the U-shaped bracket, connecting plate, and locking bolts. At the same time, the stiffening plate on the inner wall of the U-shaped bracket enhances the strength of the bracket itself. This design provides fixed support from both ends of the assembly frame through U-shaped brackets, connecting plates, and locking bolts. Combined with the bolt connection at the shaft center, it forms a "multi-point fixing" structure, completely solving the problem of existing devices where only the shaft center is fixed and the left and right ends are unrestrained. The spline shaft and spline groove prevent relative rotation between the adapter frame and the column, the positioning pin ensures accurate installation of the assembly frame, and the stiffening plate enhances the load-bearing capacity of the U-shaped bracket. The multiple structures work together to resist wind, rain, and snow loads, prevent the assembly frame from swaying and tilting, prevent the gap electrode position from shifting, and ensure the stable and reliable lightning protection function of the device.

[0014] 2. During assembly, the splicing column and splicing hole quickly achieve initial docking between the adapter frame and the column. The splined shaft is inserted into the spline groove without repeated angle adjustments, completing the circumferential positioning of the adapter frame. When the assembly frame is docked with the adapter frame via positioning pins, the positioning pins guide the assembly frame to precise positioning, avoiding bolt hole misalignment and reducing assembly and adjustment time. During disassembly and maintenance, simply unscrew the locking bolts and the connecting bolts between the assembly frame and the adapter frame to remove the assembly frame along with components such as the isolating switch and surge arrester, without needing to dismantle the connection between the adapter frame and the column, simplifying the disassembly process. Simultaneously, the stiffening plate of the U-shaped bracket distributes the stress on the bracket, preventing deformation due to long-term load-bearing and extending the service life of the components. The design of the spline shaft, spline groove, and locating pins reduces the positioning difficulty during the assembly of each component, improves assembly efficiency, and reduces manual operation time. The detachable connection method facilitates the later inspection and replacement of core components such as disconnect switches and surge arresters, reducing the workload of operation and maintenance. The stiffening plate enhances the structural strength of the U-shaped bracket and prevents the bracket from deforming and causing the assembly frame to fail. The overall design takes into account both convenience and durability, ensuring the long-term stable operation of the device and meeting the high requirements of the power system for equipment reliability. Attached Figure Description

[0015] Figure 1 This is a first-view structural diagram of the assembly of this utility model; Figure 2 This is a second-view structural diagram of the assembly of this utility model; Figure 3 This is an exploded structural diagram of the assembly of this utility model; Figure 4 This is a schematic diagram of the assembly frame of this utility model; Figure 5 This is a first-view structural diagram of the adapter frame of this utility model; Figure 6 This is a second-view structural schematic diagram of the adapter frame of this utility model.

[0016] In the diagram: 1-Assembly frame, 2-Column, 3-Disconnecting switch, 4-Surge arrester, 5-Current transformer, 6-Adapter frame, 7-U-shaped bracket, 8-Connecting plate, 9-Locking bolt, 10-Connecting groove, 11-Splicing hole, 12-Splined shaft, 13-Spline groove, 14-Positioning pin, 15-Reinforcing plate, 16-Threaded hole. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0018] like Figures 1 to 6 As shown, a transformer lightning protection grounding device includes an assembly frame 1 and a column 2 corresponding to each other. From left to right, a disconnecting switch 3, a surge arrester 4, and a current transformer 5 are fixedly installed on the top of the assembly frame 1. A splicing column 17 is fixedly connected to the top of the column 2. A transition frame 6 is slidably connected to the outer surface of the splicing column 17. The transition frame 6 is fixedly connected to the column 2 by bolts. The assembly frame 1 is fixedly installed on the top of the transition frame 6 by bolts. U-shaped brackets 7 are fixedly installed on both the left and right sides of the transition frame 6 by bolts. A connecting plate 8 is fixedly connected to the end of the U-shaped bracket 7 away from the transition frame 6. Both connecting plates 8 are slidably connected to the assembly frame 1. A locking bolt 9 is threadedly connected to the top of each connecting plate 8. The nuts of the two locking bolts 9 are in contact with the top surface of the assembly frame 1.

[0019] As an optional technical solution of this utility model, the top surface of the assembly frame 1 has two symmetrically arranged connecting slots 10. The two connecting plates 8 are slidably connected to the assembly frame 1 through the two connecting slots 10. The connecting slots 10 on the top surface of the assembly frame 1 provide a sliding channel for the connecting plates 8, which allows the connecting plates 8 to be accurately inserted into the assembly frame 1, ensuring that the U-shaped bracket 7 and the assembly frame 1 are stably connected, avoiding the failure of fixing due to the offset of the connecting plates 8 during installation. At the same time, the sliding connection method makes it easy to adjust the position of the connecting plates 8, adapt to different installation scenarios, and enhance the assembly flexibility.

[0020] As an optional technical solution of this utility model, the bottom surface of the adapter frame 6 is provided with a splicing hole 11, and the splicing column 17 is inserted into the splicing hole 11. The length of the splicing column 17 is equal to the depth of the splicing hole 11. The splicing hole 11 on the bottom surface of the adapter frame 6 and the splicing column 6 are matched, and the length and depth of the two are equal, so that the splicing column 6 can be completely embedded in the splicing hole 11, realizing the precise positioning of the adapter frame 6 and the column 2, avoiding vertical displacement of the adapter frame 6 during installation, ensuring the coaxiality of the connection between the adapter frame 6 and the column 2, and laying the foundation for the stable installation of the subsequent assembly frame 1.

[0021] As an optional technical solution of this utility model, a spline shaft 12 is fixedly connected to the top of the splicing column 17, and a spline groove 13 is opened inside the splicing hole 11. The spline shaft 12 is inserted into the spline groove 13. The spline shaft 12 at the top of the splicing column 6 cooperates with the spline groove 13 in the splicing hole 11, which can limit the relative rotation between the adapter frame 6 and the column 2, prevent the adapter frame 6 from circumferentially shifting under outdoor wind loads, ensure that the adapter frame 6 always maintains a stable posture, and avoid the misalignment of components such as the disconnecting switch 3 and the surge arrester 4 on the assembly frame 1 due to the rotation of the adapter frame 6.

[0022] As an optional technical solution of this utility model, the bottom surface of the assembly frame 1 is fixedly connected with a number of evenly distributed positioning pins 14. The positioning pins 14 are all inserted into one side of the adapter frame 6. The positioning pins 14 on the bottom surface of the assembly frame 1 are inserted into one side of the adapter frame 6, which can quickly locate the installation position of the assembly frame 1 and the adapter frame 6, avoid the left and right or front and back offset during the installation of the assembly frame 1, ensure that the components on the assembly frame 1 are accurately aligned with the adapter frame 6, reduce the bolt hole alignment adjustment time, and improve assembly efficiency.

[0023] As an optional technical solution of this utility model, each U-shaped bracket 7 has two symmetrically arranged stiffening plates 15 fixedly connected to its inner wall. Both U-shaped brackets 7 are located directly below the assembly frame 1. The stiffening plates 15 on the inner wall of the U-shaped bracket 7 can enhance the structural strength of the U-shaped bracket 7 and prevent the U-shaped bracket 7 from deforming when it bears the weight of the assembly frame 1 for a long time or when it is subjected to outdoor loads. At the same time, the two U-shaped brackets 7 are located directly below the assembly frame 1, which can evenly distribute the force on the assembly frame 1, further improve the stability of the assembly frame 1, and extend the service life of the device.

[0024] As an optional technical solution of this utility model, the end of the U-shaped bracket 7 away from the adapter 6 is provided with a threaded hole 16. The nuts of the two locking bolts 9 are both in contact with the top surface of the assembly frame 1 through the threaded hole 16. The threaded hole 10 at one end of the U-shaped bracket 7 cooperates with the locking bolt 9, so that the locking bolt 9 can be tightly in contact with the top surface of the assembly frame 1 through the threaded hole 10, and the connecting plate 8 is firmly fixed on the assembly frame 1. This prevents the connecting plate 8 from loosening and causing the U-shaped bracket 7 to detach from the assembly frame 1, ensuring the auxiliary fixing effect of the U-shaped bracket 7 on the assembly frame 1 and improving the overall structural stability.

[0025] A transformer lightning protection grounding device, the working principle of which is as follows: 1): During assembly, first insert the splicing post 6 at the top of the column 2 into the splicing hole 11 on the bottom of the adapter 6, so that the spline shaft 12 is embedded in the spline groove 13, and fix the adapter 6 to the column 2 with bolts.

[0026] 2): Align the positioning pin 14 on the bottom of the assembly frame 1 with the adapter frame 6 and insert it to initially position the assembly frame 1. Then, use bolts to fix the assembly frame 1 to the top of the adapter frame 6.

[0027] 3): Install U-shaped brackets 7 on the left and right sides of the adapter frame 6 with bolts, align the connecting plate 8 of the U-shaped bracket 7 away from the adapter frame 6 with the connecting groove 10 on the top surface of the assembly frame 1, and finally screw the locking bolt 9 into the threaded hole 16 of the connecting plate 8 until the nut of the locking bolt 9 is in contact with the top surface of the assembly frame 1, thus completing the fixing of the U-shaped bracket 7 to the assembly frame 1.

[0028] In summary, this transformer lightning protection grounding device, through the U-shaped bracket 7, connecting plate 8, and locking bolt 9, provides fixed support from both ends of the assembly frame 1. Combined with the bolt connection at the shaft center, this forms a "multi-point fixing" structure, completely solving the problem of existing devices where only the shaft center is fixed and the left and right ends are unrestrained. The spline shaft 12 and spline groove 13 prevent relative rotation between the adapter frame 6 and the column 2. The positioning pin 14 ensures accurate installation of the assembly frame 1, and the stiffening plate 15 enhances the load-bearing capacity of the U-shaped bracket 7. These multiple structures work together to resist wind, rain, and snow loads, preventing the assembly frame 1 from swaying or tilting, preventing the gap electrode position from shifting, and ensuring the stable and reliable lightning protection function of the device. During disassembly and maintenance, simply unscrew the locking bolt 9 and the connecting bolts between the assembly frame 1 and the adapter frame 6 to remove the assembly frame 1 along with components such as the isolating switch 3 and the surge arrester 4, without needing to dismantle the connection between the adapter frame 6 and the column 2, simplifying the disassembly process. Simultaneously, the stiffening plate 15 of the U-shaped bracket 7 distributes the force on the bracket, preventing deformation of the U-shaped bracket 7 under long-term load and extending the service life of the components. The design of the spline shaft 12, spline groove 13, and positioning pin 14 reduces the positioning difficulty during the assembly of each component, improves assembly efficiency, and reduces manual operation time. The detachable connection method facilitates the later inspection and replacement of core components such as disconnecting switch 3 and surge arrester 4, reducing the workload of operation and maintenance. The stiffening plate 15 enhances the structural strength of the U-shaped bracket 7 and prevents the bracket from deforming and causing the assembly frame 1 to fail. The overall design takes into account both convenience and durability, ensuring the long-term stable operation of the device and meeting the high requirements of the power system for equipment reliability.

Claims

1. A transformer lightning protection grounding device, characterized in that: The assembly includes an assembly frame (1) and a column (2) with corresponding upper and lower parts. The top of the assembly frame (1) is fixedly installed with a disconnecting switch (3), a surge arrester (4) and a current transformer (5) from left to right. The top of the column (2) is fixedly connected with a splicing column (17). The outer surface of the splicing column (17) is slidably connected with a transition frame (6). The transition frame (6) is fixedly connected to the column (2) by bolts. The assembly frame (1) is fixedly installed on the top of the transition frame (6) by bolts. U-shaped brackets (7) are fixedly installed on both the left and right sides of the transition frame (6) by bolts. A connecting plate (8) is fixedly connected to the end of the U-shaped bracket (7) away from the transition frame (6). Both connecting plates (8) are slidably connected to the assembly frame (1). A locking bolt (9) is threadedly connected to the top of each connecting plate (8). The nuts of both locking bolts (9) are in contact with the top surface of the assembly frame (1).

2. The transformer lightning protection grounding device according to claim 1, characterized in that: The top surface of the assembly frame (1) has two symmetrically arranged connecting slots (10), and the two connecting plates (8) are slidably connected to the assembly frame (1) through the two connecting slots (10).

3. A transformer lightning protection grounding device according to claim 2, characterized in that: The bottom surface of the adapter (6) is provided with a splicing hole (11), and the splicing column (17) is inserted into the splicing hole (11). The length of the splicing column (17) is equal to the depth of the splicing hole (11).

4. A transformer lightning protection grounding device according to claim 3, characterized in that: The splicing column (17) is fixedly connected to a spline shaft (12) at its top end. A spline groove (13) is provided inside the splicing hole (11), and the spline shaft (12) is inserted into the spline groove (13).

5. A transformer lightning protection grounding device according to claim 4, characterized in that: The bottom surface of the assembly frame (1) is fixedly connected with several evenly distributed positioning pins (14), and the several positioning pins (14) are all inserted into one side of the adapter frame (6).

6. A transformer lightning protection grounding device according to claim 5, characterized in that: Each of the U-shaped brackets (7) has two symmetrically arranged stiffening plates (15) fixedly connected to its inner wall, and both of the U-shaped brackets (7) are located directly below the assembly frame (1).

7. A transformer lightning protection grounding device according to claim 6, characterized in that: The U-shaped bracket (7) has a threaded hole (16) at one end away from the adapter (6), and the nuts of the two locking bolts (9) are attached to the top surface of the assembly frame (1) through the threaded hole (16).

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