Lightning arrester protection device

Abstract

The invention relates to the technical field of lightning arresters, in particular to a lightning arrester protection device which comprises a composite post insulator, two lightning arresters symmetrically arranged on an upper support and electrically connected with a cable through the upper support, and the two ends of the composite post insulator are provided with a lower support and an upper support respectively. The lower support is provided with a monitoring assembly electrically connected with the lightning arresters and used for monitoring leakage current of the lightning arresters, and the lower support is provided with a switching assembly connected with the monitoring assembly. When the leakage current is abnormal, the switching assembly can timely isolate the faulty lightning arrester and put the other lightning arrester into use, power supply reliability and system safety are guaranteed, fault expansion is avoided, the monitoring assembly monitors the leakage current in real time, early warning is achieved, accurate switching is achieved, the misoperation risk is reduced, fault positioning is clear, and the service life of the lightning arrester is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning arresters, and specifically to a lightning arrester protection device. Background Art

[0002] As the core protection device of transmission cables, the lightning arrester can clamp the overvoltage amplitude in real time through its non-linear volt-ampere characteristic, discharge the transient overcurrent, stabilize the cable voltage within the safety threshold, effectively suppress insulation breakdown and equipment failures, and at the same time absorb and dissipate the overvoltage energy, ensuring the continuous and stable operation of the line under complex working conditions such as lightning strikes and switching overvoltages. It is a key barrier for the safe power supply of the power grid. In the prior art, lightning arresters are generally integrated with disconnectors. Its function is that when serious faults such as short circuits and explosions occur in the lightning arrester, the circuit can be quickly cut off through a thermal fuse or a mechanical tripping mechanism to isolate the fault point to prevent cascading damage to the system, and the fault location can be accurately located through visual means such as mechanical bursting discs and color markings to avoid secondary disasters caused by equipment explosions, significantly reducing the operation and maintenance costs and improving the system reliability. However, when the lightning arrester is disconnected due to a fault, the cable section it protects will be directly exposed to the risks of lightning strikes or overvoltages, which may lead to short circuits, equipment burnout, or even fire accidents due to overload breakdown of the insulation layer. For this reason, we propose a lightning arrester protection device. Summary of the Invention

[0003] To solve the above technical problems, an embodiment of the present application provides a lightning arrester protection device, which includes a composite post insulator. Lower brackets and upper brackets are respectively installed at both ends of the composite post insulator. The device also includes two lightning arresters symmetrically arranged on the upper bracket and electrically connected to the cable through the upper bracket. A monitoring component electrically connected to the lightning arrester is arranged on the lower bracket for monitoring the leakage current of the lightning arrester. A switching component connected to the monitoring component is arranged on the lower bracket. In the initial state, only one of the lightning arresters is grounded. When the monitoring component monitors that the leakage current of the lightning arrester is continuously abnormal, the switching component is used to disconnect the grounding connection of the currently grounded lightning arrester and ground the other lightning arrester.

[0004] In some embodiments, the switching component includes an insulating housing arranged on the lower bracket. Two grounded Z-shaped conductors are symmetrically arranged inside the insulating housing. A push rod is arranged on one side of the Z-shaped conductor. The push rod is made of insulating material. A sliding sleeve is fixedly connected inside the insulating housing. The push rod passes through the sliding sleeve and is slidably connected to its inner wall. By moving the push rod, the Z-shaped conductor can be driven to connect to the lightning arrester. And a driving motor is fixedly connected to the insulating housing. A rotating disc is fixedly connected to the output shaft of the driving motor. One end of the push rod is rotatably connected to a cylinder. A first guide groove member is formed on the rotating disc. One end of the cylinder is located in the first guide groove member. During the process of starting the driving motor to drive the rotating disc to rotate, the rotating disc first drives a Z-shaped conductor to move to dock with one lightning arrester, then drives the other Z-shaped conductor to move to dock with the other lightning arrester, and finally drives the Z-shaped conductor that first docked with the lightning arrester to separate from the lightning arrester.

[0005] In some embodiments, the first guide groove member includes an arc-shaped groove one formed on the rotating disc. One end of a cylinder is located in the arc-shaped groove one and is slidably connected to its inner wall. An arc-shaped groove two concentric with the rotating disc is formed on the rotating disc. The arc-shaped groove two is communicated with the arc-shaped groove one. And an arc-shaped groove three communicated with the arc-shaped groove two is formed on the rotating disc. During the process of rotating the rotating disc, the cylinder sequentially passes through the arc-shaped groove one, the arc-shaped groove two, and the arc-shaped groove three to drive the Z-shaped conductor to first dock with the lightning arrester, then maintain the docking state with the lightning arrester, and finally separate from the lightning arrester. And an arc-shaped groove four concentric with the rotating disc is formed on the rotating disc. One end of another cylinder is located in the arc-shaped groove four and is slidably connected to its inner wall. An arc-shaped groove five communicated with the arc-shaped groove four is formed on the rotating disc. And an arc-shaped groove six concentric with the rotating disc is formed on the rotating disc. The arc-shaped groove six is communicated with the arc-shaped groove five. During the process of rotating the rotating disc, the cylinder sequentially passes through the arc-shaped groove four, the arc-shaped groove five, and the arc-shaped groove six to drive the Z-shaped conductor to maintain the disconnected state from the lightning arrester, then drive it to dock with the lightning arrester, and finally maintain the docking state with the lightning arrester.

[0006] In some embodiments, one end of the lightning arrester is fixedly connected to an insulating mounting plate. The insulating mounting plate is fixedly connected to the lower bracket. And one end of the lightning arrester is fixedly connected to a disconnector. A conductive stud is fixedly connected to the disconnector. A nut is screwed on the conductive stud. One end of the Z-shaped conductor is designed in a C shape for moving the Z-shaped conductor to dock with the conductive stud.

[0007] In some embodiments, a sliding rod is fixedly connected to the Z-shaped conductor. One end of the sliding rod slidably passes through the push rod. A tension spring with two ends respectively fixed to the Z-shaped conductor and the push rod is sleeved on the sliding rod. When the Z-shaped conductor and the conductive stud are in the docking state, the tension spring is in the stretched state. When the disconnector operates, the tension spring resets to assist in driving the disconnector to disconnect from the lightning arrester.

[0008] In some embodiments, one end of the Z-shaped conductor is fixedly connected to a hollow cylinder, a sliding column is slidably connected inside the hollow cylinder, a second guide groove member is provided on the inner wall of the insulating housing, and one end of the sliding column is located inside the second guide groove member, so as to keep the tension spring in a stretched state by the sliding of the sliding column inside the second guide groove member during the process of driving the Z-shaped conductor to dock with the conductive stud by the moving push rod; After the release operates, during the process of driving the Z-shaped conductor to retract by the moving push rod, the tension spring is elongated by the sliding of the sliding column inside the second guide groove member.

[0009] In some embodiments, the second guide groove member includes a horizontal sliding groove provided on the inner wall of the insulating housing, one end of the sliding column is located inside the horizontal sliding groove and is slidably connected to its inner wall, a vertical sliding groove communicating with the horizontal sliding groove is provided on the insulating housing, and an inclined sliding groove is provided on the insulating housing, and two ends of the inclined sliding groove are respectively communicated with the horizontal sliding groove and the vertical sliding groove; The inclined sliding groove is designed in a stepped manner, the stepped part is designed with an inclined surface, and the deeper part of the inclined sliding groove has the same depth as the horizontal sliding groove and the vertical sliding groove, and its shallower part is docked with the horizontal sliding groove to form a step. One end of the sliding column located inside the hollow cylinder is fixedly connected to a spring, and one end of the spring is fixedly connected to the inner wall of the hollow cylinder.

[0010] In some embodiments, the sliding column is designed with a conductive material, a conductive plate is arranged inside the insulating housing, the conductive plate is in contact with the sliding column, and a conductive column is fixedly connected to one side of the conductive plate; The monitoring assembly includes a leakage ammeter fixedly connected to the insulating housing, the leakage ammeter is electrically connected to the controller of the driving motor and is grounded. One end of the push rod corresponding to the first arc-shaped groove is fixedly connected to a connecting column, the connecting column is designed with an insulating material, one end of the connecting column is fixedly connected to a connecting plate, a first docking plate is arranged on one side of each of the two conductive columns, and a connecting column is also fixedly connected between the first docking plate and the connecting plate, and the first docking plate is grounded through a wire.

[0011] In some embodiments, a second docking plate is arranged on one side of each of the two conductive columns, a connecting column is also fixedly connected between the second docking plate and the connecting plate, and the second docking plate is electrically connected to the leakage ammeter through a wire. After driving the Z-shaped conductor corresponding to the first arc-shaped groove to dock with the lightning arrester, the conductive column corresponding to the Z-shaped conductor only contacts the second docking plate, and the conductive column corresponding to the other Z-shaped conductor only contacts the first docking plate.

[0012] In some embodiments, a ring body is rotatably connected to the nut, and a rope body is fixedly connected between the ring body and the insulating mounting plate.

[0013] The present invention has at least the following beneficial effects: 1. The device adopts two symmetrical lightning arresters to form redundant protection. Initially, only one is grounded. When abnormal leakage current occurs, the switching component can isolate the faulty lightning arrester in time and switch in the other one to ensure power supply reliability and system safety, avoid the expansion of faults, the monitoring component monitors the leakage current in real time to achieve early warning, and precise switching reduces the risk of misoperation. The fault location is clear and the service life of the lightning arrester is extended.

[0014] 2. The lightning arrester of this device also integrates a disconnector. When the lightning arrester suddenly fails, the disconnector can be automatically triggered to disconnect the lightning arrester. During this process, the Z-shaped conductive plate will neither interfere with the operation of the disconnector, nor can it utilize the elastic force generated by the reset of the tension spring to provide assistance or auxiliary drive for the operation of the disconnector, effectively ensuring that the disconnector can smoothly and stably separate from the lightning arrester. Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the structure in another orientation; Figure 3 For the present invention Figure 2 Schematic diagram of the sectional structure; Figure 4 For the present invention Figure 3 Schematic diagram of the sectional structure; Figure 5 For the present invention Figure 4 Schematic diagram of the structure in another orientation; Figure 6 For the present invention Figure 4 Schematic diagram of the sectional structure; Figure 7 For the present invention Figure 6 Schematic diagram of the sectional structure; Figure 8 Schematic diagram of the structure at the conductive plate of the present invention; Figure 9 Schematic diagram of the structure of Embodiment 2 of the present invention.

[0016] In the figure: 1 - composite post insulator; 11 - lower bracket; 12 - upper bracket; 2 - lightning arrester; 3 - monitoring component; 4 - switching component; 41 - insulating housing; 42 - Z-shaped conductor; 43 - push rod; 44 - sliding sleeve; 45 - drive motor; 46 - rotating disc; 47 - cylinder; 48 - first guide groove member; 49 - first arc groove; 51 - second arc groove; 52 - third arc groove; 53 - fourth arc groove; 54 - fifth arc groove; 55 - sixth arc groove; 56 - insulating mounting plate; 57 - disconnector; 58 - conductive stud; 59 - nut; 61 - sliding rod; 62 - tension spring; 63 - hollow cylinder; 64 - sliding column; 65 - second guide groove member; 66 - horizontal sliding groove; 67 - vertical sliding groove; 68 - inclined sliding groove; 69 - spring; 71 - conductive plate; 72 - conductive column; 73 - leakage ammeter; 74 - connecting column; 75 - connecting plate; 76 - first docking plate; 77 - second docking plate; 78 - ring body; 79 - rope body. Detailed implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1: Please refer to Figures 1-8 , the present invention provides a technical solution: a lightning arrester protection device, including a composite post insulator 1, with a lower bracket 11 and an upper bracket 12 respectively installed at both ends of the composite post insulator 1, and further including: Two lightning arresters 2, symmetrically arranged on the upper bracket 12 and electrically connected to the cable through the upper bracket 12; A monitoring component 3, arranged on the lower bracket 11 and electrically connected to the lightning arrester 2, for monitoring the leakage current of the lightning arrester 2; A switching component 4, arranged on the lower bracket 11 and connected to the monitoring component 3. In the initial state, only one lightning arrester 2 is grounded. When the monitoring component 3 monitors that the leakage current of the lightning arrester 2 is continuously abnormal, the switching component 4 disconnects the grounding connection of the currently grounded lightning arrester 2 and grounds the other lightning arrester 2; Specifically, this device uses two symmetric lightning arresters 2 to form redundant protection. Initially, only one is grounded. When the leakage current is abnormal, the switching component 4 can promptly isolate the faulty lightning arrester 2 and put the other one into operation, ensuring power supply reliability and system safety, avoiding the expansion of faults. The monitoring component 3 monitors the leakage current in real time to achieve early warning, and the precise switching reduces the risk of misoperation. The fault location is clear and the service life of the lightning arrester 2 is extended; The arrester 2 of this device also integrates a disconnector 57. When the arrester 2 suddenly fails, the disconnector 57 can be automatically triggered to disconnect the arrester 2. During this process, the Z-shaped conductive plate 71 will neither interfere with the operation of the disconnector 57 nor can it utilize the elastic force generated by the reset of the tension spring 62 to provide assistance or auxiliary drive for the operation of the disconnector 57, effectively ensuring that the disconnector 57 can smoothly and stably separate from the arrester 2.

[0019] The switching component 4 includes an insulating housing 41 fixedly connected to the lower bracket 11. Two grounded Z-shaped conductors 42 are symmetrically arranged inside the insulating housing 41. A push rod 43 is arranged on one side of each Z-shaped conductor 42. The push rod 43 is made of insulating material. A sliding sleeve 44 is fixedly connected inside the insulating housing 41. The push rod 43 passes through the sliding sleeve 44 and is slidably connected to its inner wall. Moving the push rod 43 drives the Z-shaped conductor 42 to dock with the arrester 2; And a drive motor 45 is fixedly connected to the insulating housing 41. A rotating disk 46 is fixedly connected to the output shaft of the drive motor 45. One end of the push rod 43 is rotatably connected to a cylinder 47. A first guide groove member 48 is formed on the rotating disk 46. One end of the cylinder 47 is located inside the first guide groove member 48. During the process of starting the drive motor 45 to drive the rotating disk 46 to rotate, the rotating disk 46 first drives one Z-shaped conductor to move and dock with one arrester 2, then drives the other Z-shaped conductor 42 to move and dock with the other arrester 2, and finally drives the Z-shaped conductor 42 that was first docked with the arrester 2 to separate from this arrester 2; Specifically, after the two arresters 2 of this device are respectively installed on the upper and lower brackets 11, their tops are electrically connected to the cable through the upper bracket 12, and their bottoms are in a disconnected state. The drive motor 45 is started to drive the rotating disk 46 to rotate, first making one Z-shaped conductor 42 move and dock with one arrester 2. This arrester 2 is then grounded through the leakage ammeter 73, and the device enters the normal working state; During operation, if the leakage ammeter 73 detects frequent overvoltages in this arrester 2 for a period of time, the program will control the drive motor 45 to rotate, driving the other Z-shaped conductor 42 to dock with the other arrester 2. This arrester 2 is directly grounded. Therefore, the leakage ammeter 73 still monitors the initial arrester 2. At this time, the two arresters 2 are in parallel to jointly resist subsequent overvoltages and extend the service life. When the overvoltage returns to normal and the leakage ammeter 73 shows normal current, the program controls the drive motor 45 to rotate back to disconnect the later-connected arrester 2; If the leakage ammeter 73 shows continuous abnormal current, the program will control the drive motor 45 to first drive the other Z-shaped conductor 42 to dock with the other arrester 2, and then drive the first-docked Z-shaped conductor 42 to separate from the original arrester 2, thereby completing the switching of the arrester 2 to ensure that the device continuously and effectively protects the cable.

[0020] The guide groove part 1 includes an arc groove 1 on the rotating disk 2. One end of a cylinder 3 is located in the arc groove 1 and is slidably connected to its inner wall. An arc groove 2 concentric with the rotating disk 2 is formed on the rotating disk 2. The arc groove 2 is communicated with the arc groove 1, and an arc groove 3 communicated with the arc groove 2 is formed on the rotating disk 2. During the process of rotating the rotating disk 2, the cylinder 3 sequentially passes through the arc groove 1, the arc groove 2, and the arc groove 3 to drive the Z-shaped conductor connected to the push rod 5 to be first butted with the arrester 6, then maintain the butted state with the arrester 6, and finally disengage from the arrester 6; An arc groove 4 concentric with the rotating disk 2 is formed on the rotating disk 2. One end of another cylinder 3 is located in the arc groove 4 and is slidably connected to its inner wall. An arc groove 5 communicated with the arc groove 4 is formed on the rotating disk 2, and an arc groove 6 concentric with the rotating disk 2 is formed on the rotating disk 2. The arc groove 6 is communicated with the arc groove 5. During the process of rotating the rotating disk 2, the cylinder 3 sequentially passes through the arc groove 4, the arc groove 5, and the arc groove 6 to drive the Z-shaped conductor 4 connected to the push rod 5 to first maintain the disconnected state from the arrester 6, then drive it to be butted with the arrester 6, and finally maintain the butted state with the arrester 6.

[0021] One end of the arrester 6 is fixedly connected with an insulating mounting plate 7, the insulating mounting plate 7 is fixedly connected with the lower bracket 8, and one end of the arrester 6 is fixedly connected with a disconnector 9. A conductive stud 10 is fixedly connected to the disconnector 9, and a nut 11 is screwed on the conductive stud 10; One end of the Z-shaped conductor 4 is designed in a C shape for moving the Z-shaped conductor 4 to butt against the conductive stud 10. Specifically, the Z-shaped conductor 4 is inserted into the gap between the nut 11 and the disconnector 9 and is in contact with the conductive stud 10 to conduct current.

[0022] A slide bar 12 is fixedly connected to the Z-shaped conductor 4. One end of the slide bar 12 slidably passes through the push rod 5. A tension spring 13 sleeved on the slide bar 12 is fixedly connected to the Z-shaped conductor 4 and the push rod 5 respectively at both ends. When the Z-shaped conductor 4 and the conductive stud 10 are in a butted state, the tension spring 13 is in a stretched state, which is used to drive the disconnector 9 to disconnect from the arrester 6 when the disconnector 9 operates. In this design, the Z-shaped conductive plate 14 will neither interfere with the operation of the disconnector 9 nor can it utilize the elastic force generated by the reset of the tension spring 13 to provide assistance or auxiliary drive for the operation of the disconnector 9.

[0023] One end of the Z-shaped conductor 42 is fixedly connected to a hollow cylinder 63. A sliding column 64 is slidably connected inside the hollow cylinder 63. A second guide groove member 65 is provided on the inner wall of the insulating housing 41. One end of the sliding column 64 is located inside the second guide groove member 65. The second guide groove member 65 includes a horizontal sliding groove 66 provided on the inner wall of the insulating housing 41. One end of the sliding column 64 is located inside the horizontal sliding groove 66 and is slidably connected to its inner wall. A vertical sliding groove 67 communicating with the horizontal sliding groove 66 is provided on the insulating housing 41. An inclined sliding groove 68 is provided on the insulating housing 41. Two ends of the inclined sliding groove 68 are respectively communicated with the horizontal sliding groove 66 and the vertical sliding groove 67. The inclined sliding groove 68 is designed in a stepped manner. The stepped part is designed with an inclined surface. The deeper part of the inclined sliding groove 68 has the same depth as the horizontal sliding groove 66 and the vertical sliding groove 67. Its shallower part is butted against the horizontal sliding groove 66 to form a step. One end of the sliding column 64 located inside the hollow cylinder 63 is fixedly connected to a spring 69. One end of the spring 69 is fixedly connected to the inner wall of the hollow cylinder 63. Specifically, during the process of moving the push rod 43 to drive the Z-shaped conductor 42 to be butted against the arrester 2, the sliding column 64 can only move along the horizontal sliding groove 66 into the vertical sliding groove 67 because the depth of the horizontal sliding groove 66 is deeper than that of the inclined sliding groove 68 butted against it. Thus, the Z-shaped conductor 42 moving parallel to the horizontal sliding groove 66 can be easily inserted into the gap between the nut 59 and the disconnector 57 to complete the butt joint. Subsequently, if the disconnector 57 triggers a disconnection action, at this time, since the sliding column 64 is located inside the vertical sliding groove 67, the tension spring 62 can freely contract and reset, thereby driving the Z-shaped conductor 42 and the disconnector 57 to move away from the arrester 2. Subsequently, the sliding column 64 moves into the inclined sliding groove 68. At the same time, the leakage ammeter 73 detects that no current is generated in the arrester 2 due to disconnection, so the driving motor 45 is controlled to rotate through a program, thereby driving the push rod 43 and the Z-shaped conductor 42 to move and retract. During this process, the sliding column 64 slides along the inclined sliding groove 68 and passes through the inclined surface. The inclined surface pushes the sliding column 64 and compresses the spring 69 connected to it. When the sliding column 64 is butted against the horizontal sliding groove 66, the spring 69 resets to drive the sliding column 64 to be embedded in the horizontal sliding groove 66, thus completing the reset operation.

[0024] The sliding column 64 is designed with a conductive material. A conductive plate 71 is provided inside the insulating housing 41. The conductive plate 71 is in contact with and abuts against the sliding column 64. One side of the conductive plate 71 is fixedly connected to a conductive column 72. The monitoring component 3 includes a leakage ammeter 73 fixedly connected to the insulating housing 41. The leakage ammeter 73 is electrically connected to the controller of the drive motor 45 and is grounded. One end of the push rod 43 corresponding to the first arc-shaped groove 49 is fixedly connected with a connecting column 74. A sliding groove is formed on the insulating housing 41. One end of the connecting column 74 slides through the sliding groove. The connecting column 74 is designed with insulating material. One end of the connecting column 74 is fixedly connected with a connecting plate 75. On one side of each of the two conductive columns 72, there is a first docking plate 76. A connecting column 74 is also fixedly connected between the first docking plate 76 and the connecting plate 75. The first docking plate 76 is grounded through a wire.

[0025] On one side of each of the two conductive columns 72, there is a second docking plate 77. A connecting column 74 is also fixedly connected between the second docking plate 77 and the connecting plate 75. The second docking plate 77 is electrically connected to the leakage ammeter 73 through a wire. When the Z-shaped conductor 42 corresponding to the first arc-shaped groove 49 is docked with the lightning arrester 2, the conductive column 72 corresponding to the Z-shaped conductor 42 only contacts the second docking plate 77, while the conductive column 72 corresponding to the other Z-shaped conductor 42 only contacts the first docking plate 76. Specifically, the first docking plate 76 is directly grounded, while the second docking plate 77 is grounded through the leakage ammeter 73. Under this design, no matter what docking state the two lightning arresters 2 and the cable are in, only one lightning arrester 2 in use is always connected to the leakage ammeter 73, thereby improving the monitoring accuracy. There are three specific docking states. The first one is that when the first lightning arrester 2 is put into use and the second lightning arrester 2 is not in use, at this time, the Z-shaped conductor 42 docked with the first lightning arrester 2 is docked with the second docking plate 77, that is, the first lightning arrester 2 is grounded through the leakage ammeter 73. The second one is that both the first lightning arrester 2 and the second lightning arrester 2 are put into use. At this time, the first lightning arrester 2 is still grounded through the leakage ammeter 73, and the Z-shaped conductor 42 docked with the second lightning arrester 2 is docked with the first docking plate 76, that is, the second lightning arrester 2 is directly grounded. Because when the device works normally, the first lightning arrester 2 is used for a longer time, so the probability of its damage is greater. Therefore, the leakage ammeter 73 is used to strictly monitor it in real time to detect problems in time. The third one is that the first lightning arrester 2 is damaged and not in use, while the second lightning arrester 2 is put into use. At this time, the Z-shaped conductor 42 docked with the second lightning arrester 2 is docked with the second docking plate 77, so that the leakage ammeter 73 can monitor the second lightning arrester 2 in real time.

[0026] Embodiment 2: Please refer to Figures 1-9 , the present invention provides a technical solution: Embodiment 2 is optimized on the basis of Embodiment 1. A ring body 78 is rotatably connected to a nut 59, and a rope body 79 is fixedly connected between the ring body 78 and an insulating mounting plate 56. Thus, after the release device 57 operates, the fragments of the release device 57 are held by the rope body 79 to prevent them from falling.

[0027] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A lightning arrester protection device, comprising a composite post insulator (1), wherein lower brackets (11) and upper brackets (12) are respectively installed at two ends of the composite post insulator (1), and it is characterized in that, It also includes: Two lightning arresters (2), symmetrically arranged on the upper bracket (12) and electrically connected to the cable through the upper bracket (12); A monitoring component (3), arranged on the lower bracket (11) and electrically connected to the lightning arrester (2), for monitoring the leakage current of the lightning arrester (2); A switching component (4), arranged on the lower bracket (11) and connected to the monitoring component (3). In the initial state, only one of the lightning arresters (2) is grounded. When the monitoring component (3) monitors that the leakage current of the lightning arrester (2) is continuously abnormal, the switching component (4) disconnects the grounding connection of the currently grounded lightning arrester (2) and grounds the other lightning arrester (2).

2. The lightning arrester protection device according to claim 1, wherein: The switching component (4) includes an insulating housing (41) arranged on the lower bracket (11). Two grounded Z-shaped conductors (42) are symmetrically arranged inside the insulating housing (41). A push rod (43) is arranged on one side of the Z-shaped conductor (42). The push rod (43) is made of insulating material. A sliding sleeve (44) is fixedly connected inside the insulating housing (41). The push rod (43) passes through the sliding sleeve (44) and is slidably connected to its inner wall. Moving the push rod (43) drives the Z-shaped conductor (42) to dock with the lightning arrester (2); And a driving motor (45) is fixedly connected to the insulating housing (41). A rotating disc (46) is fixedly connected to the output shaft of the driving motor (45). One end of the push rod (43) is rotatably connected to a cylinder (47). A first guide groove member (48) is formed on the rotating disc (46). One end of each of the two cylinders (47) is located inside the first guide groove member (48). During the process of starting the driving motor (45) to drive the rotating disc (46) to rotate, the rotating disc (46) first drives one Z-shaped conductor (42) to move to dock with one lightning arrester (2), then drives the other Z-shaped conductor (42) to move to dock with the other lightning arrester (2), and finally drives the Z-shaped conductor (42) that first docked with the lightning arrester (2) to disengage from the lightning arrester (2).

3. The lightning arrester protection device according to claim 2, characterized in that: The first guide groove member (48) includes an arc-shaped groove one (49) formed on the rotating disc (46). One end of a cylinder (47) is located inside the arc-shaped groove one (49) and is slidably connected to its inner wall. An arc-shaped groove two (51) concentric with the rotating disc (46) is formed on the rotating disc (46). The arc-shaped groove two (51) is communicated with the arc-shaped groove one (49). And an arc-shaped groove three (52) communicated with the arc-shaped groove two (51) is formed on the rotating disc (46). During the process of rotating the rotating disc (46), the cylinder (47) sequentially passes through the arc-shaped groove one (49), the arc-shaped groove two (51), and the arc-shaped groove three (52) to drive the Z-shaped conductor (42) to first dock with the lightning arrester (2), then maintain the docking state with the lightning arrester (2), and finally disengage from the lightning arrester (2); An arc-shaped groove four (53) concentric with the rotating disc (46) is formed in the rotating disc (46). One end of the other cylinder (47) is located in the arc-shaped groove four (53) and is slidably connected to its inner wall. An arc-shaped groove five (54) communicating with the arc-shaped groove four (53) is formed in the rotating disc (46). An arc-shaped groove six (55) concentric with the rotating disc (46) is formed in the rotating disc (46). The arc-shaped groove six (55) communicates with the arc-shaped groove five (54). During the rotation of the rotating disc (46), the cylinder (47) sequentially passes through the arc-shaped groove four (53), the arc-shaped groove five (54), and the arc-shaped groove six (55) to drive the Z-shaped conductor (42) to maintain a disconnected state from the arrester (2), then drive it to dock with the arrester (2), and finally maintain a docked state with the arrester (2).

4. The lightning arrester protection device according to claim 3, characterized in that: One end of the arrester (2) is fixedly connected to an insulating mounting plate (56). The insulating mounting plate (56) is fixedly connected to the lower bracket (11). One end of the arrester (2) is fixedly connected to a disconnector (57). A conductive stud (58) is fixedly connected to the disconnector (57). A nut (59) is screwed onto the conductive stud (58). One end of the Z-shaped conductor (42) is designed in a C shape for moving the Z-shaped conductor (42) to dock with the conductive stud (58).

5. The lightning arrester protection device according to claim 4, characterized in that: A slide bar (61) is fixedly connected to the Z-shaped conductor (42). One end of the slide bar (61) slidably passes through the push rod (43). A tension spring (62) with two ends fixedly connected to the Z-shaped conductor (42) and the push rod (43) respectively is sleeved on the slide bar (61). When the Z-shaped conductor (42) and the conductive stud (58) are in a docked state, the tension spring (62) is in a stretched state, which is used to assist in driving the disconnector (57) to disconnect from the arrester (2) when the disconnector (57) operates and the tension spring (62) resets.

6. The lightning arrester protection device according to claim 5, characterized in that: A hollow cylinder (63) is fixedly connected to one end of the Z-shaped conductor (42). A sliding column (64) is slidably connected in the hollow cylinder (63). A guide groove member two (65) is formed on the inner wall of the insulating housing (41). One end of the sliding column (64) is located in the guide groove member two (65), which is used to keep the tension spring (62) in a stretched state through the sliding of the sliding column (64) in the guide groove member two (65) during the process of moving the push rod (43) to drive the Z-shaped conductor (42) to dock with the conductive stud (58). After the disconnector (57) operates, it is used to stretch the tension spring (62) through the sliding of the sliding column (64) in the guide groove member two (65) during the process of moving the push rod (43) to drive the Z-shaped conductor (42) to retract.

7. The lightning arrester protection device according to claim 6, characterized in that: The second guide groove member (65) includes a horizontal chute (66) formed on the inner wall of the insulating housing (41). One end of the sliding column (64) is located in the horizontal chute (66) and is slidably connected to its inner wall. A vertical chute (67) communicating with the horizontal chute (66) is formed on the insulating housing (41), and an inclined chute (68) is formed on the insulating housing (41). The two ends of the inclined chute (68) are respectively communicated with the horizontal chute (66) and the vertical chute (67). The inclined chute (68) adopts a stepped design, and the stepped part adopts a bevel design. The deeper part of the inclined chute (68) has the same depth as the horizontal chute (66) and the vertical chute (67). Its shallower part is butted against the horizontal chute (66) to form a step. One end of the sliding column (64) located inside the hollow cylinder (63) is fixedly connected with a spring (69), and one end of the spring (69) is fixedly connected to the inner wall of the hollow cylinder (63).

8. The lightning arrester protection device according to claim 7, characterized in that: The sliding column (64) is designed with a conductive material. A conductive plate (71) is arranged inside the insulating housing (41). The conductive plate (71) is in contact with and abuts against the sliding column (64), and a conductive column (72) is fixedly connected to one side of the conductive plate (71). The monitoring component (3) includes a leakage ammeter (73) fixedly connected to the insulating housing (41). The leakage ammeter (73) is electrically connected to the controller of the driving motor (45), and the leakage ammeter (73) is grounded. One end of the push rod (43) corresponding to the first arc-shaped groove (49) is fixedly connected with a connecting column (74). The connecting column (74) is designed with an insulating material. One end of the connecting column (74) is fixedly connected with a connecting plate (75). One docking plate one (76) is arranged on one side of each of the two conductive columns (72). A connecting column (74) is also fixedly connected between the docking plate one (76) and the connecting plate (75). The docking plate one (76) is grounded through a wire.

9. The lightning arrester protection device according to claim 8, characterized in that: One docking plate two (77) is arranged on one side of each of the two conductive columns (72). A connecting column (74) is also fixedly connected between the docking plate two (77) and the connecting plate (75). The docking plate two (77) is electrically connected to the leakage ammeter (73) through a wire. When the Z-shaped conductor (42) corresponding to the first arc-shaped groove (49) is driven to be butted against the lightning arrester (2), the conductive column (72) corresponding to the Z-shaped conductor (42) only contacts the docking plate two (77), while the conductive column (72) corresponding to the other Z-shaped conductor (42) only contacts the docking plate one (76).

10. The lightning arrester protection device according to claim 9, characterized in that: A ring body (78) is rotatably connected to the nut (59). A rope body (79) is fixedly connected between the ring body (78) and the insulating mounting plate (56).

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