Power transformer core grounding structure

Abstract

The application relates to the technical field of power transformers, and particularly discloses a power transformer iron core grounding structure which comprises a transformer main body, an iron core fixedly connected to the outer wall of the transformer main body, and a grounding wire fixedly connected to the end of the iron core; a ground drilling mechanism, which is located at the end of the grounding wire and can drive the grounding wire to drill into the ground; and a locking mechanism, which is located at the periphery of the grounding wire and can lock the grounding wire when the ground drilling mechanism drills the ground. When the application is used, whether the end of the grounding wire is inserted into the ground can be judged through a photosensitive sensor, the grounding wire is drilled into the ground through the ground drilling mechanism, the grounding wire is connected with the ground, the grounding position of the grounding wire is locked through the locking mechanism of the ground drilling mechanism, the virtual connection of the grounding wire is avoided, and the iron core of the transformer main body is connected with the ground.

Description

Technical Field

[0001] This invention relates to the field of power transformer technology, specifically to a power transformer core grounding structure. Background Technology

[0002] Grounding the core of a power transformer can protect the transformer and the power system for stable operation. Core grounding can eliminate the floating potential generated in the core in a strong electric field, prevent discharge between the core and the grounding components, protect the transformer oil and insulation components. At the same time, grounding can introduce the instantaneous overvoltage that may be generated in the core into the earth, providing additional protection for the transformer, ensuring the safety and reliability of the power system, and improving the operating efficiency of the transformer.

[0003] In existing power transformers, the grounding wire is connected underground. However, under long-term wind erosion and rain erosion, the grounding wire buried underground will be exposed to the air. This not only leads to a loose connection of the grounding wire, but also the contact between the exposed grounding wire and the damp soil will accelerate the corrosion of the grounding wire or the grounding core. This poses a safety hazard in the long term. Therefore, we propose a grounding structure for the core of power transformers. Summary of the Invention

[0004] The purpose of this invention is to provide a grounding structure for the core of a power transformer to solve the problem mentioned in the background art that, under long-term wind erosion and rain erosion, the grounding wire buried underground will be exposed to the air. This will not only lead to a loose connection of the grounding wire, but also accelerate the corrosion of the grounding wire or the grounding core due to contact with the exposed grounding wire and the damp soil, which poses a safety hazard in the long term.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a power transformer core grounding structure, comprising a transformer body, wherein an iron core is fixedly connected to the outer wall of the transformer body, and a grounding wire is fixedly connected to the end of the iron core; A drilling mechanism, located at the end of a grounding wire, is capable of driving the grounding wire to drill into the ground; The drilling mechanism includes a drilling shell rotatably connected to the periphery of a grounding wire, a spiral blade fixedly connected to the outer wall of the drilling shell, a photosensitive sensor disposed outside the drilling shell, an electromagnetic ring rotatably connected to the lower end of the photosensitive sensor, and the outer wall of the electromagnetic ring closely adhering to the outer wall of the drilling shell. A locking mechanism is located outside the grounding wire, and the locking mechanism can lock the grounding wire when the drilling mechanism is drilling.

[0006] The grounding wire has two retaining rings fixedly connected to its outer wall. The two retaining rings are located at both ends of the drilled earth shell. A connecting rod is fixedly connected to the outer wall of the retaining ring. The connecting rod is located outside the drilled earth shell. The photosensitive sensor is fixedly connected to the connecting rod.

[0007] The locking mechanism includes a nut disposed around the grounding wire, the nut being threaded to the outer wall of the grounding wire, two support plates being fixedly connected to the inner wall of the drilling shell, a support rod being fixedly connected between the two support plates, a torsion spring being fixedly connected to the outer wall of the support rod, a locking plate being fixedly connected to the end of the torsion spring away from the support rod, the locking plate being rotatably connected to the support rod, and the end of the locking plate away from the support rod abutting against the nut.

[0008] The drilled crust is conical, and its cross-sectional area decreases from top to bottom.

[0009] The inner wall of the drilled crust has a rotating groove, and a rotating ring is rotatably connected inside the rotating groove. Multiple teeth are fixedly connected to the inner wall of the rotating ring, and each tooth is arranged in a ring.

[0010] The rotating ring has a stop bar fixedly connected to its lower end. The stop bar is located inside the drilling crust. The locking plate is rotatably connected to a drive plate at the end away from the support rod. The drive plate abuts against the stop bar at the end away from the locking plate.

[0011] The inner wall of the drilled crust is fixedly connected to a support ring, and a rotating rod is rotatably connected inside the support ring. A transmission gear is fixedly connected to the lower end of the rotating rod, and the transmission gear meshes with teeth.

[0012] A polishing brush is fixedly connected to the upper end of the rotating rod.

[0013] This invention has at least the following beneficial effects: When in use, this invention can determine whether the end of the grounding wire is inserted into the ground through a photosensitive sensor, and drill the grounding wire into the ground through a drilling mechanism to ensure that the grounding wire is connected to the earth. The drilling mechanism locks the grounding position of the grounding wire through a locking mechanism to avoid the phenomenon of loose grounding connection and ensure that the iron core of the transformer body is connected to the earth. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the transformer of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the borehole in this invention; Figure 3 for Figure 2 Enlarged structural diagram of area A in the middle; Figure 4 This is a schematic diagram of the overall structure of the locking mechanism of the present invention; Figure 5 for Figure 4 Enlarged structural diagram of area B in the middle; Figure 6 This is a schematic cross-sectional view of the locking plate of the present invention; Figure 7 for Figure 6 Enlarged structural diagram of area C; Figure 8 This is a schematic diagram of the overall structure of the grinding brush of the present invention.

[0015] In the diagram: 1. Transformer body; 11. Iron core; 12. Grounding wire; 2. Drilling mechanism; 21. Drilling crust; 22. Spiral cutting edge; 23. Photosensitive sensor; 24. Electromagnetic ring; 25. Retaining ring; 26. Connecting rod; 3. Locking mechanism; 31. Nut; 32. Support plate; 33. Support rod; 34. Torsion spring; 35. Locking plate; 4. Rotating groove; 41. Rotating ring; 42. Tooth; 43. Stop bar; 44. Drive plate; 45. Support ring; 46. Rotating rod; 47. Transmission gear; 48. Grinding brush. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1-8 The present invention provides a technical solution: a power transformer core grounding structure, including a transformer body 1, an iron core 11 fixedly connected to the outer wall of the transformer body 1, and a grounding wire 12 fixedly connected to the end of the iron core 11; Drilling mechanism 2, located at the end of grounding wire 12, is capable of driving grounding wire 12 to drill into the ground; The drilling mechanism 2 includes a drilling shell 21 rotatably connected to the periphery of the grounding wire 12. A spiral blade 22 is fixedly connected to the outer wall of the drilling shell 21. A photosensitive sensor 23 is provided on the outside of the drilling shell 21. An electromagnetic ring 24 is rotatably connected to the lower end of the photosensitive sensor 23. The outer wall of the electromagnetic ring 24 is in close contact with the outer wall of the drilling shell 21. Locking mechanism 3, located around grounding wire 12, is capable of locking grounding wire 12 when drilling mechanism 2 is drilling. When in use, the present invention can determine whether the end of the grounding wire 12 is inserted into the ground by using the photosensitive sensor 23, and drill the grounding wire 12 into the ground by the drilling mechanism 2 to ensure that the grounding wire 12 is connected to the earth. The drilling mechanism 2 locks the grounding position of the grounding wire 12 by the locking mechanism 3 to avoid the phenomenon of the grounding wire 12 being loosely connected, and ensures that the iron core 11 of the transformer body 1 is connected to the earth.

[0018] Two retaining rings 25 are fixedly connected to the outer wall of the grounding wire 12. The two retaining rings 25 are located at both ends of the drilling shell 21. A connecting rod 26 is fixedly connected to the outer wall of the retaining rings 25. The connecting rod 26 is located outside the drilling shell 21. The photosensitive sensor 23 is fixedly connected to the connecting rod 26. When the photosensitive sensor detects the light source signal, the grounding wire 12 is partially exposed to the air. The photosensitive sensor activates the circuit of the electromagnetic ring 24. At this time, the electromagnetic ring 24 rotates. Since the electromagnetic ring 24 is close to the outer wall of the drilling shell 21, the rotation of the electromagnetic ring 24 can drive the drilling shell 21 to rotate. At this time, the spiral blade 22 located outside the drilling shell 21 guides the drilling shell 21 to drill into the ground. Since the upper end of the drilling shell 21 is located between the two retaining rings 25, as the drilling shell 21 goes deeper into the ground, the grounding wire 12 is also pulled into the ground, thereby ensuring that the grounding wire 12 can contact the underground medium more effectively.

[0019] The locking mechanism 3 includes a nut 31 disposed around the grounding wire 12. The nut 31 is threadedly connected to the outer wall of the grounding wire 12. Two support plates 32 are fixedly connected to the inner wall of the drilling shell 21. A support rod 33 is fixedly connected between the two support plates 32. A torsion spring 34 is fixedly connected to the outer wall of the support rod 33. A locking plate 35 is fixedly connected to the end of the torsion spring 34 away from the support rod 33. The locking plate 35 is rotatably connected to the support rod 33. The end of the locking plate 35 away from the support rod 33 abuts against the nut 31.

[0020] The torsion spring 34 applies a continuous torsional torque to the locking plate 35, ensuring that the end of the locking plate 35 away from the support rod 33 is always in close contact with the outer surface of the nut 31. When the drill housing 21 rotates, the drill housing 21 rotates in conjunction with the support rod 33 through the support plate 32. At this time, the support rod 33, with the help of the elastic potential energy of the torsion spring 34, drives the locking plate 35 to slide along the outer periphery of the nut 31. The specific function is as follows: 1. When the nut 31 shows signs of loosening, the support rod 33 rotates synchronously with the locking plate 35 during rotation, thereby tightening the nut 31 and restoring the nut 31 to its tight state. Second, if the nut 31 is in a tightened state, the locking plate 35 will rotate around the support rod 33. At this time, the locking plate 35 will sweep across the surface of the nut 31 and eventually contact the next end face of the nut 31. As the drilling crust 21 continues to drill into the ground, the locking plate 35 will tighten and reinforce the nut 31 again, effectively preventing the grounding wire 12 from having a loose connection with the soil and ensuring the reliability of the grounding connection.

[0021] The drilling shell 21 is conical, and the cross-sectional area of ​​the drilling shell 21 decreases from top to bottom. The conical shape of the drilling shell 21 helps to improve the guidance and stability of the drilling shell 21 and reduce the possibility of deviating from the predetermined trajectory. At the same time, the conical shape of the drilling shell 21 enables the spiral cutting edge 22 to penetrate the formation more effectively during the drilling process, thereby improving the drilling efficiency.

[0022] A rotating groove 4 is formed on the inner wall of the drilling shell 21. A rotating ring 41 is rotatably connected inside the rotating groove 4. Multiple teeth 42 are fixedly connected to the inner wall of the rotating ring 41. Each tooth 42 is arranged in a ring. A stop bar 43 is fixedly connected to the lower end of the rotating ring 41. The stop bar 43 is located inside the drilling shell 21. A drive plate 44 is rotatably connected to the end of the locking plate 35 away from the support rod 33. The end of the drive plate 44 away from the locking plate 35 abuts against the stop bar 43. When the drilling shell rotates and the nut 31 is in a tightened state, the locking plate 35 sweeps over the nut 31 and rotates around the support rod 33. At this time, the locking plate 35 is linked with the drive plate 44, which in turn pushes the stop rod 43 to rotate slightly inside the drilling shell 21. At the same time, the locking plate 35 and the drive plate 44 rotate synchronously and are in an extended state. After the locking plate 35 completes the action of sweeping over the surface of the nut 31, during the reset process of the locking plate 35, the locking plate 35 will drive the drive plate 44 to fold back. At this time, both are in a folded state. During the process of the drive plate 44 pushing and resetting the stop bar 43, the rotating ring 41 can be made to rotate inside the rotating groove 4. Based on the rotation of the rotating ring 41 driven by the drilling shell 21, the drive rod further makes the rotating ring 41 rotate back and forth in a small range, which paves the way for grinding the contact point between the nut 31 and the grounding wire 12.

[0023] A support ring 45 is fixedly connected to the inner wall of the drilling shell 21. A rotating rod 46 is rotatably connected inside the support ring 45. A transmission gear 47 is fixedly connected to the lower end of the rotating rod 46. The transmission gear 47 meshes with teeth 42. A polishing brush 48 is fixedly connected to the upper end of the rotating rod 46. When the rotating ring 41 rotates inside the rotating groove 4, the teeth 42 located inside the rotating ring 41 drive the transmission gear 47 to rotate around the rotating rod 46. At this time, the rotating rod 46 is constrained to rotate inside the support ring 45. A grinding brush 48 is fixedly connected to the upper end of the rotating rod 46. When the rotating rod 46 rotates, it can drive the grinding brush 48 to rotate. Then the grinding brush 48 grinds the contact surface between the nut 31 and the grounding wire 12 to remove the rust attached to the surface of the nut 31 and the grounding wire 12, so as to ensure that the grounding wire 12 is connected to the earth. As the rotating ring 41 rotates back and forth at a lower amplitude, it provides the polishing brush 48 with multiple and continuous polishing conditions, enabling the polishing brush 48 to more comprehensively and deeply treat the rusted area of ​​the contact surface between the nut 31 and the grounding wire 12, thereby achieving a more thorough polishing effect and ensuring good conductivity and long-term stability of the grounding wire 12 and the earth.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grounding structure for the core of a power transformer, comprising: The transformer body (1) has an iron core (11) fixedly connected to its outer wall, and a grounding wire (12) fixedly connected to the end of the iron core (11). Its characteristic is that it further includes: The drilling mechanism (2) is located at the end of the grounding wire (12) and can drive the grounding wire (12) to drill into the ground. The drilling mechanism (2) includes a drilling shell (21) rotatably connected to the periphery of a grounding wire (12). A spiral blade (22) is fixedly connected to the outer wall of the drilling shell (21). A photosensitive sensor (23) is provided on the outside of the drilling shell (21). An electromagnetic ring (24) is rotatably connected to the lower end of the photosensitive sensor (23). The outer wall of the electromagnetic ring (24) is in close contact with the outer wall of the drilling shell (21). The locking mechanism (3) is located outside the grounding wire (12) and can lock the grounding wire (12) when the drilling mechanism (2) is drilling.

2. The power transformer core grounding structure according to claim 1, characterized in that: Two retaining rings (25) are fixedly connected to the outer wall of the grounding wire (12). The two retaining rings (25) are located at both ends of the drilling shell (21). A connecting rod (26) is fixedly connected to the outer wall of the retaining ring (25). The connecting rod (26) is located outside the drilling shell (21). The photosensitive sensor (23) is fixedly connected to the connecting rod (26).

3. The power transformer core grounding structure according to claim 1, characterized in that: The locking mechanism (3) includes a nut (31) disposed around the grounding wire (12). The nut (31) is threadedly connected to the outer wall of the grounding wire (12). Two support plates (32) are fixedly connected to the inner wall of the drilling shell (21). A support rod (33) is fixedly connected between the two support plates (32). A torsion spring (34) is fixedly connected to the outer wall of the support rod (33). A locking plate (35) is fixedly connected to the end of the torsion spring (34) away from the support rod (33). The locking plate (35) is rotatably connected to the support rod (33). The end of the locking plate (35) away from the support rod (33) abuts against the nut (31).

4. The power transformer core grounding structure according to claim 1, characterized in that: The drilled crust (21) is conical, and the cross-sectional area of ​​the drilled crust (21) decreases from top to bottom.

5. The power transformer core grounding structure according to claim 3, characterized in that: The inner wall of the drilled crust (21) has a rotating groove (4), and a rotating ring (41) is rotatably connected inside the rotating groove (4). Multiple teeth (42) are fixedly connected to the inner wall of the rotating ring (41), and each tooth (42) is arranged in a ring.

6. The power transformer core grounding structure according to claim 5, characterized in that: The lower end of the rotating ring (41) is fixedly connected to a stop bar (43), the stop bar (43) is located inside the drilling shell (21), and the locking plate (35) is rotatably connected to a drive plate (44) at the end away from the support rod (33), and the end of the drive plate (44) away from the locking plate (35) abuts against the stop bar (43).

7. The power transformer core grounding structure according to claim 6, characterized in that: A support ring (45) is fixedly connected to the inner wall of the drilling shell (21). A rotating rod (46) is rotatably connected inside the support ring (45). A transmission gear (47) is fixedly connected to the lower end of the rotating rod (46). The transmission gear (47) meshes with teeth (42).

8. The power transformer core grounding structure according to claim 7, characterized in that: A polishing brush (48) is fixedly connected to the upper end of the rotating rod (46).

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