A stable lightning protection device

Abstract

This invention relates to the field of power supply system technology and discloses a stable lightning arrester, including a mounting bracket and a lightning arrester body. The lightning arrester body includes a housing, on the surface of which a disconnector, a fixed contact, and a telescopic contact are fixedly mounted. A rotating assembly is rotatably mounted inside the housing. A driving mechanism and a limiting mechanism are respectively provided inside the housing. The driving mechanism drives the rotating assembly to rotate at a fixed angle, and the limiting mechanism constrains the rotation angle of the rotating assembly. The rotating assembly includes an inner ring, an outer ring, and several resistor modules arranged in a ring array. This design switches different resistor modules to conduct through the intermittent rotation of the rotating assembly, so as to detect whether each resistor module is faulty. When a fault is detected, the lightning arrester body falls down so that maintenance personnel can find and repair it in time.

Description

Technical Field

[0001] This invention relates to the field of power supply system technology, and in particular to a stable lightning protection device. Background Technology

[0002] A drop-out surge arrester is a modified distribution-type zinc oxide surge arrester cleverly installed on the drop-out mechanism of a drop-out fuse. This allows for convenient inspection, maintenance, and replacement of the arrester using an insulated lever without interrupting power. To facilitate timely fault detection and repair, patent document CN105680404B discloses a drop-out surge arrester comprising an insulating support column and an arrester body. The lower end of the insulating support column is connected to an installation column, and the upper end is connected to a terminal block and a voltage-conducting plate. The lower end of the arrester body is connected to the installation column via a rotatable component, and the upper end is detachably connected to the voltage-conducting plate via a pull ring component. This arrester has a simple and reasonable structure and low manufacturing cost. A limit switch is added to the first connection part to introduce the arrester fault signal to the feeder automation terminal. Combined with the feeder automation terminal, the drop-out surge arrester fault signal is transmitted to the power automation system, which will notify maintenance personnel. This not only ensures the continuity of the line but also greatly reduces the workload and time of power maintenance personnel.

[0003] During the use of this type of surge arrester, if the arrester malfunctions and falls (drops), maintenance personnel can easily detect it and replace it. However, in many cases, the surge arrester is installed normally and is not in a fallen state. Due to abnormal operating conditions (repeated lightning strikes, high temperature, aging, etc.), the surge arrester loses its normal function. When a fault occurs inside the surge arrester, the fault current passing through the arrester may not cause the arrester's trip unit to disconnect, but it will cause a grounding phenomenon in the power grid at the arrester, leading to a power grid trip. This type of surge arrester fault is difficult for maintenance personnel to detect. Based on this, existing surge arresters have the defect of being inconvenient to self-test. When they lose their lightning protection function but remain in a fallen state, it is difficult to detect, and their function is unstable, which urgently needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing surge arresters, such as the inconvenience of self-testing, and to propose a stable surge arrester device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a stable lightning arrester, comprising a mounting bracket and a lightning arrester body, wherein the lightning arrester body comprises a housing, a disconnector, a fixed contact and a telescopic contact are fixedly mounted on the surface of the housing, and four first electrode plates are fixedly mounted on the inner wall of the housing, wherein two of the first electrode plates are electrically connected to the fixed contact and the telescopic contact respectively, and the other two first electrode plates are electrically connected to the disconnector.

[0006] The housing is equipped with a rotating assembly, and a driving mechanism and a limiting mechanism are respectively provided inside the housing. The driving mechanism drives the rotating assembly to rotate at a fixed angle, and the limiting mechanism restricts the rotation angle of the rotating assembly.

[0007] The rotating assembly includes an inner ring, an outer ring, and several resistor modules arranged in a ring array. Both the inner and outer rings are fixedly connected to each resistor module. Each resistor module includes multiple stacked zinc oxide resistor sheets. A central boss is provided inside the housing. The inner ring rotates and is fitted onto the surface of the central boss. Several second electrode sheets are embedded on the surface of the outer ring. Two adjacent resistor modules are electrically connected through the second electrode sheets. When the rotating assembly rotates inside the housing, each second electrode sheet slides into contact with the first electrode sheet in sequence. This design switches different resistor modules to conduct through the intermittent rotation of the rotating assembly, so as to detect whether each resistor module is faulty. When a fault occurs, the surge arrester body falls down so that maintenance personnel can find and repair it in time.

[0008] Preferably, the telescopic contact includes a mounting post and a movable sleeve. The mounting post is fixedly connected to the housing, and the movable sleeve is slidably fitted onto the surface of the mounting post. A first spring is provided inside the movable sleeve, and the two ends of the first spring are fixedly connected to the mounting post and the movable sleeve, respectively. A first excitation coil is embedded inside the mounting post. When the first excitation coil is energized, it generates a magnetic attraction force that attracts the movable sleeve. The surge arrester body flips down for the first time, causing the end of the fixed contact to fall into the third slot. That is, the surge arrester body is hung between the first slot and the third slot. At this time, the non-faulty resistor module is connected to the working circuit, so that the surge arrester body still has the function of lightning protection and grid protection, allowing sufficient time for maintenance personnel to come for inspection, repair, and replacement.

[0009] Preferably, the driving mechanism includes a rotating arm and an electromagnetic telescopic rod. The rotating arm is rotatably mounted on the surface of the central boss. A pawl is slidably mounted on the end of the rotating arm, and a second spring is provided inside the rotating arm to press against the pawl outward. The inner wall of the inner ring is provided with a helical tooth groove, and the pawl is inserted into the helical tooth groove.

[0010] The electromagnetic telescopic rod is rotatably mounted on the surface of the central boss. A magnetic column is slidably installed inside the electromagnetic telescopic rod, and a connecting rod is fixedly installed at the end of the magnetic column. The end of the connecting rod away from the magnetic column is rotatably connected to the rotating arm. A third spring is set inside the electromagnetic telescopic rod to press against the magnetic column inward. A second excitation coil is embedded inside the electromagnetic telescopic rod. When the second excitation coil is energized, it generates a magnetic repulsive force that pushes the magnetic column outward, so as to drive the rotating component to rotate at a fixed angle through the drive mechanism.

[0011] Preferably, the disconnector is internally provided with a first resistor, a second resistor, a discharge gap, and a thermal detonation tube. The first excitation coil is connected in parallel with the first resistor via a wire, and the second excitation coil is connected in parallel with the second resistor via a wire. The inrush current in the power grid is introduced into the second excitation coil. Unless the drive mechanism is activated, the intermittent rotation of the rotating component is automatically driven, and different resistor modules are switched to conduct with the working circuit in order to detect whether each resistor module is faulty.

[0012] Preferably, the limiting mechanism includes a limiting ball and a third spring. The outer circular surface of the central boss is provided with a mounting hole. The limiting ball and the third spring are both movably disposed in the mounting hole. The inner wall of the inner ring is provided with multiple V-shaped grooves. The third spring presses against the limiting ball, so that the limiting ball is pressed against the V-shaped groove, so that the rotating assembly rotates at a fixed angle.

[0013] Preferably, the mounting bracket includes an insulating column, with a first conductive plate and a second conductive plate fixedly mounted at both ends of the insulating column, respectively. A first slot is formed on the surface of the first conductive plate, and the electrode contact of the release device is engaged in the first slot. A second slot and a third slot are formed on the surface of the second conductive plate. When the telescopic contact is engaged in the second slot, the fixed contact is located on the upper side of the third slot.

[0014] When the second excitation coil is energized, it generates a magnetic repulsive force that pushes the magnetic column outward. The connecting rod extends outward and pushes the rotating arm to rotate, causing the pawl to move in a circle and drive the inner ring to rotate, switching the position of the resistor module and providing conditions for detecting whether each resistor module is faulty.

[0015] When the first excitation coil is energized, it generates a magnetic attraction force that attracts the movable sleeve. The electrode contacts on the movable sleeve separate from the first slot. Under the action of the arrester body's own weight, the arrester body flips down, causing the end of the fixed contact to fall into the third slot, thus realizing the arrester body's first flip.

[0016] When the current flowing through the disconnector increases, the first resistor generates high temperature and detonates the thermal detonation tube, causing the disconnector to burst. The surge arrester body falls over and is then hung in the third slot by the fixed contact, allowing the surge arrester body to fall over again and the faulty surge arrester to be disconnected from the power grid.

[0017] The present invention has the following beneficial effects:

[0018] 1. The lightning arrester proposed in this invention, by setting up a drive mechanism and a rotating component, when the lightning arrester passes through lightning waves, operational waves and power frequency overvoltages, a strong working current passes through the nonlinear resistor module of the rotating component, and after DC conversion, discharges the second excitation coil of the drive mechanism, causing the drive mechanism to operate once, so as to realize the rotation of the rotating component at a certain angle. This cycle is repeated to switch different resistor modules to the working circuit. If the resistor module fails, the first excitation coil is energized, causing the telescopic contact to separate from the second slot, causing the lightning arrester body to fall down and hang between the first slot and the third slot.

[0019] This design uses the intermittent rotation of the rotating component to switch different resistor modules connected to the working circuit, so as to detect whether each resistor module is faulty. When a fault occurs, the surge arrester body falls down so that maintenance personnel can find and repair it in time.

[0020] 2. The lightning arrester proposed in this invention has a very small leakage current flowing through the resistor module under normal operating voltage, a very small current in the first excitation coil, and no movement of the telescopic contact. The telescopic contact is locked in the second slot. At this time, the lightning arrester body is in a normal installation state.

[0021] When the resistor module malfunctions, the first excitation coil is energized, the telescopic contact shortens and separates from the second slot, and the surge arrester body falls, causing the end of the fixed contact to fall into the third slot. That is, the surge arrester body is hung between the first and third slots. At this time, the non-faulty resistor module is connected to the working circuit, so that the surge arrester body still has the function of lightning protection and grid protection, allowing sufficient time for maintenance personnel to come for inspection, repair and replacement.

[0022] 3. The lightning protection device proposed in this invention has multiple resistor modules installed in the rotating component. When lightning waves, switching waves and power frequency overvoltages in the power grid are introduced to the ground through the lightning arrester body, the rotating component rotates at a certain angle, causing each resistor module to switch to the working circuit in sequence. This prevents a certain resistor module from being frequently energized and accumulating heat, thus extending its service life. In particular, after multiple lightning strikes, the lightning arrester body can still maintain a stable lightning protection function. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the lightning protection device proposed in this invention;

[0024] Figure 2 This is a partial cross-sectional three-dimensional structural diagram of the lightning protection device proposed in this invention;

[0025] Figure 3 This is a schematic diagram of the rotating component and the housing separation structure proposed in this invention;

[0026] Figure 4This is an exploded structural diagram of the rotating assembly proposed in this invention;

[0027] Figure 5 This is a schematic diagram of the partial cross-sectional front view of the shell structure proposed in this invention. Figure 1 ;

[0028] Figure 6 This is a schematic diagram of the partial cross-sectional front view of the shell structure proposed in this invention. Figure 2 ;

[0029] Figure 7 This is a circuit diagram of the lightning protection device proposed in this invention;

[0030] Figure 8 This is a schematic diagram of the installation of the lightning protection device proposed in this invention. Figure 1 ;

[0031] Figure 9 This is a schematic diagram of the installation of the lightning protection device proposed in this invention. Figure 2 ;

[0032] Figure 10 This is a schematic diagram of the installation of the lightning protection device proposed in this invention. Figure 3 .

[0033] In the diagram: 1. Housing, 2. Release device, 3. Fixed contact, 4. Telescopic contact, 5. First electrode plate, 6. Inner ring, 7. Outer ring, 8. Resistor module, 9. Central boss, 10. Second electrode plate, 11. Mounting post, 12. Movable sleeve, 13. Rotating arm, 14. Electromagnetic telescopic rod, 15. Pawl, 16. Helical tooth groove, 17. Magnetic post, 18. Connecting rod, 19. First resistor, 20. Second resistor, 21. Discharge gap, 22. Thermostatic tube, 23. Limiting ball, 24. V-groove, 25. Insulating post, 26. First conductive plate, 27. Second conductive plate, 28. First slot, 29. Second slot, 30. Third slot, 31. First excitation coil, 32. Second excitation coil. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Reference Figures 1-10A stable lightning arrester includes a mounting bracket and a lightning arrester body. The lightning arrester body includes a housing 1. A disconnector 2, a fixed contact 3, and a telescopic contact 4 are fixedly mounted on the surface of the housing 1. Four first electrode plates 5 are fixedly mounted on the inner wall of the housing 1. Two of the first electrode plates 5 are electrically connected to the fixed contact 3 and the telescopic contact 4, respectively, and the other two first electrode plates 5 are electrically connected to the disconnector 2. (See reference for details.) Figure 3 , Figure 7 .

[0037] Among them, such as Figure 6 As shown, the telescopic contact 4 includes a mounting post 11 and a movable sleeve 12. The mounting post 11 is fixedly connected to the housing 1. The movable sleeve 12 is slidably sleeved on the surface of the mounting post 11. A first spring is provided inside the movable sleeve 12. The two ends of the first spring are fixedly connected to the mounting post 11 and the movable sleeve 12 respectively. A first excitation coil 31 is embedded inside the mounting post 11. When the first excitation coil 31 is energized, it generates a magnetic attraction force to attract the movable sleeve 12.

[0038] like Figure 1 , Figure 2 As shown, the mounting bracket includes an insulating column 25, with a first conductive plate 26 and a second conductive plate 27 fixedly mounted at both ends of the insulating column 25. The first conductive plate 26 is connected to the grounding wire, and the second conductive plate 27 is connected to the power grid. A first slot 28 is formed on the surface of the first conductive plate 26, and the electrode contact of the disconnector 2 is engaged in the first slot 28. A second slot 29 and a third slot 30 are formed on the surface of the second conductive plate 27. When the telescopic contact 4 is engaged in the second slot 29, the fixed contact 3 is located on the upper side of the third slot 30.

[0039] The housing 1 has a rotating assembly installed inside it. The housing 1 also has a drive mechanism and a limiting mechanism. The drive mechanism drives the rotating assembly to rotate at a fixed angle, and the limiting mechanism restricts the rotation angle of the rotating assembly.

[0040] Specifically, such as Figure 3 , Figure 4 As shown, the rotating assembly includes an inner ring 6, an outer ring 7, and several resistor modules 8. The resistor modules 8 are arranged in a ring array, and the inner ring 6 and the outer ring 7 are fixedly connected to each resistor module 8. The resistor module 8 includes multiple stacked zinc oxide resistors. Utilizing the good nonlinear current-voltage characteristics of the zinc oxide resistors, the current flowing through the resistor module 8 is extremely small (microamps or milliamps) under normal operating voltage. When an overvoltage occurs, the resistance of the resistor module 8 drops sharply, dissipating the energy of the overvoltage and achieving the effect of protecting the circuit.

[0041] The housing 1 has a central boss 9 inside, the inner ring 6 is rotatably sleeved on the surface of the central boss 9, and a number of second electrode plates 10 are embedded on the surface of the outer ring 7. Two adjacent resistor modules 8 are electrically connected through the second electrode plates 10. When the rotating assembly rotates inside the housing 1, each second electrode plate 10 slides into contact with the first electrode plate 5 in sequence.

[0042] In this embodiment, as Figure 6 As shown, the limiting mechanism includes a limiting ball 23 and a third spring. The outer circular surface of the central boss 9 is provided with a mounting hole. The limiting ball 23 and the third spring are both movably disposed in the mounting hole. The inner wall of the inner ring 6 is provided with multiple V-shaped grooves 24. The third spring presses against the limiting ball 23, so that the limiting ball 23 is pressed against the V-shaped groove 24, thereby realizing the function of the limiting mechanism to constrain the rotation angle of the rotating component.

[0043] like Figure 5 As shown, the drive mechanism includes a rotating arm 13 and an electromagnetic telescopic rod 14. The rotating arm 13 is rotatably mounted on the surface of the central boss 9. A pawl 15 is slidably mounted on the end of the rotating arm 13, and a second spring is provided inside the rotating arm 13 to press against the pawl 15 outward. The inner wall of the inner ring 6 is provided with a helical tooth groove 16, and the pawl 15 is inserted into the helical tooth groove 16.

[0044] The electromagnetic telescopic rod 14 is rotatably mounted on the surface of the central boss 9. A magnetic column 17 is slidably mounted inside the electromagnetic telescopic rod 14. A connecting rod 18 is fixedly mounted at the end of the magnetic column 17. The end of the connecting rod 18 away from the magnetic column 17 is rotatably connected to the rotating arm 13. A third spring is provided inside the electromagnetic telescopic rod 14 to press against the magnetic column 17 inward. A second excitation coil 32 is embedded inside the electromagnetic telescopic rod 14. When the second excitation coil 32 is energized, it generates a magnetic repulsive force that pushes the magnetic column 17 to move outward. Under the action of this magnetic repulsive force and the third spring, the connecting rod 18 extends and retracts, pushing the rotating arm 13 to swing back and forth at a fixed angle, thereby driving the rotating assembly to rotate at a fixed angle.

[0045] The disconnector 2 internally includes a first resistor 19 (R1), a second resistor 20 (R2), a discharge gap 21, and a thermal detonation tube 22. The first excitation coil 31 is connected in parallel with the first resistor 19 via a wire, and the second excitation coil 32 is connected in parallel with the second resistor 20 via a wire. The specific circuit connection is as follows: Figure 7 As shown, this is common knowledge in electrical engineering and will not be elaborated upon here.

[0046] It should be noted that the disconnector 2, as a special accessory for the surge arrester, is used in series with the surge arrester. When the surge arrester fails, it can quickly trip, disconnecting the faulty surge arrester from the power grid. It also provides a clear disconnection indicator to facilitate maintenance personnel in locating the fault and replacing the surge arrester. On the other hand, when the surge arrester is operating normally, the disconnector 2 does not trip, exhibiting low impedance and not affecting the protection characteristics of the surge arrester. The working principle of the disconnector 2 is described in the following reference: Figure 7 The power frequency current flows through resistor R1 and is grounded, while the impulse current passes through resistor R2 and breaks down the discharge gap 21 to ground. When the surge arrester is normal, the power frequency current flowing through resistor R1 is small and will not cause resistor R1 to heat up. When the surge arrester fails, the power frequency current flowing through resistor R1 increases, the temperature of resistor R1 rises sharply and ignites the thermal detonation tube 22, thus enabling the faulty surge arrester to be disconnected from the power grid.

[0047] like Figure 8 As shown, the surge arrester body is installed in the mounting bracket. Under normal operating voltage, the leakage current flowing through the resistor module 8 is very small, the current in the first excitation coil 31 is very small, the telescopic contact 4 does not operate, and the telescopic contact 4 is locked in the second slot 29. At this time, the surge arrester body is in a normal installation state (e.g., Figure 8 (as shown);

[0048] There are two situations when the surge arrester body fails: the first situation is that some resistor modules 8 fail, and the second situation is that all resistor modules 8 fail.

[0049] In the first scenario, taking the failure of resistor module 8 as an example, when the power grid introduces lightning waves, switching waves, and power frequency overvoltages into the surge arrester body through the second conductive plate 27, a strong operating current flows through the nonlinear resistor module 8 of the rotating component, causing a sharp drop in the resistance of resistor module 8. The surge current breaks down the discharge gap 21, achieving ground discharge, and the second excitation coil 32 is energized. Figure 5 As shown, when the second excitation coil 32 is energized, it generates a magnetic repulsive force that pushes the magnetic column 17 outward. The connecting rod 18 extends outward and pushes the rotating arm 13 to rotate, causing the pawl 15 to move in a circular motion and drive the inner ring 6 to rotate, thus switching the position of the resistor module 8. For example, as shown... Figure 7 As shown, resistor module 8 at point C is moved to point B, resistor module 8 at point B is moved to point A, and this cycle repeats, switching different resistor modules 8 into the working circuit. For example, Figure 7 Resistor module 8 at point A is in the working circuit;

[0050] When resistor module 8 at point A malfunctions, the power frequency current flows through resistor R1 and grounds (this means the power frequency current flowing through resistor R1 is small enough not to cause resistor R1 to heat up and ignite the thermal detonation tube 22). At this time, the first excitation coil 31 is energized. When the first excitation coil 31 is energized, it generates a magnetic attraction force that attracts the movable sleeve 12. The electrode contacts on the movable sleeve 12 separate from the first slot 28. Under the weight of the surge arrester body, the surge arrester body falls, causing the end of the fixed contact 3 to fall into the third slot 30. Figure 9 As shown.

[0051] When the surge arrester body is in Figure 9 As shown in the image, at this time, see Figure 7 Resistor module 8 at point A is in a faulty state, but resistor module 8 at point C is normal. Due to the surge arrester body falling, the end of the fixed contact 3 falls into the third slot 30, and resistor module 8 at point C is in the working circuit. The surge current is discharged to the ground by resistor module 8 at point C, so that the surge arrester body maintains the normal function of lightning protection and grid protection.

[0052] This design uses the intermittent rotation of the rotating component to switch different resistor modules 8 connected to the working circuit, in order to detect whether each resistor module 8 is faulty. When a fault occurs, the surge arrester body tipes over (e.g., Figure 9 As shown in the figure, this allows maintenance personnel to detect and repair the problem in a timely manner. Furthermore, the surge arrester body is mounted between the first slot 28 and the third slot 30. At this time, the non-faulty resistor module 8 is connected to the working circuit, so that the surge arrester body still has the function of lightning protection and grid protection, allowing sufficient time for maintenance personnel to come and inspect, repair, and replace it.

[0053] In the second scenario, when all the resistor modules 8 within the surge arrester fail, the current flowing into the disconnector 2 increases. The first resistor 19 generates high temperature, igniting the thermal detonation tube 22, causing the disconnector 2 to burst. The surge arrester body then falls and is secured to the third slot 30 via the fixed contact 3. Figure 10 As shown, this enables the fault arrester to be disconnected from the power grid.

[0054] The lightning protection device proposed in this invention has multiple resistor modules 8 installed in the rotating component. When lightning waves, switching waves and power frequency overvoltages in the power grid are introduced to the ground through the lightning arrester body, the rotating component rotates at a certain angle, causing each resistor module 8 to switch to the working circuit in sequence. This prevents a certain resistor module 8 from being frequently energized and accumulating heat, thus extending its service life. In particular, after multiple lightning strikes, the lightning arrester body can still maintain a stable lightning protection function.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stable lightning arrester device comprising a mounting bracket and a lightning arrester body, characterized by: The lightning arrester body comprises a shell (1), a disconnector (2), a fixed contact (3) and an extension contact (4) are fixedly installed on the surface of the shell (1), four first electrode sheets (5) are fixedly installed on the inner wall of the shell (1), two of the first electrode sheets (5) are electrically connected with the fixed contact (3) and the extension contact (4) respectively, and the other two first electrode sheets (5) are electrically connected with the disconnector (2); A rotating assembly is rotatably installed in the shell (1), a driving mechanism and a limiting mechanism are arranged in the shell (1), the driving mechanism drives the rotating assembly to rotate at a fixed angle, and the limiting mechanism restricts the rotation angle of the rotating assembly; The rotating assembly comprises an inner ring (6), an outer ring (7) and a plurality of resistance modules (8), the plurality of resistance modules (8) are arranged in an annular array, the inner ring (6) and the outer ring (7) are fixedly connected with the resistance modules (8), the resistance module (8) comprises a plurality of mutually superposed zinc oxide resistance sheets, a center boss (9) is arranged in the shell (1), the inner ring (6) is rotatably sleeved on the surface of the center boss (9), a plurality of second electrode sheets (10) are embedded on the surface of the outer ring (7), adjacent two resistance modules (8) are electrically connected through the second electrode sheet (10), and each second electrode sheet (10) is in sliding contact with the first electrode sheet (5) in turn when the rotating assembly rotates in the shell (1); The extension contact (4) comprises a mounting column (11) and a movable sleeve (12), the mounting column (11) is fixedly connected with the shell (1), the movable sleeve (12) is slidably sleeved on the surface of the mounting column (11), a first spring is arranged in the movable sleeve (12), the two ends of the first spring are fixedly connected with the mounting column (11) and the movable sleeve (12) respectively, a first excitation coil (31) is embedded in the mounting column (11), and the first excitation coil (31) generates a magnetic attraction force to attract the movable sleeve (12) when energized; The driving mechanism comprises a rotating arm (13) and an electromagnetic extension rod (14), the rotating arm (13) is rotatably installed on the surface of the center boss (9), a pawl (15) is slidably installed at the end of the rotating arm (13), a second spring is arranged in the rotating arm (13) and abuts against the pawl (15) outward, and a bevel gear slot (16) is formed in the inner wall of the inner ring (6), and the pawl (15) is inserted into the bevel gear slot (16); The electromagnetic extension rod (14) is rotatably installed on the surface of the center boss (9), a magnetic column (17) is slidably installed in the electromagnetic extension rod (14), a connecting rod (18) is fixedly installed at the end of the magnetic column (17), one end of the connecting rod (18) away from the magnetic column (17) is rotatably connected with the rotating arm (13), a third spring is arranged in the electromagnetic extension rod (14) and abuts against the magnetic column (17) inward, a second excitation coil (32) is embedded in the electromagnetic extension rod (14), and the second excitation coil (32) generates a magnetic repulsion force to push the magnetic column (17) to move outward when energized.

2. The stable lightning protection device according to claim 1, characterized in that: The inside of the decoupler (2) is provided with a first resistor (19), a second resistor (20), a discharge gap (21) and a thermal detonator (22), the first excitation coil (31) is connected in parallel with the first resistor (19) through a wire, and the second excitation coil (32) is connected in parallel with the second resistor (20) through a wire.

3. A stable lightning protection device according to claim 2, characterized in that: The limiting mechanism comprises a limiting ball (23) and a third spring, the outer circular surface of the central boss (9) is provided with a mounting hole, the limiting ball (23) and the third spring are movably arranged in the mounting hole, the inner wall of the inner ring (6) is provided with a plurality of V-shaped grooves (24), and the third spring abuts against the limiting ball (23), so that the limiting ball (23) is pressed in the V-shaped groove (24).

4. The stable lightning protection device according to claim 3, characterized in that: The mounting bracket comprises an insulating column (25), the two ends of the insulating column (25) are fixedly provided with a first conductive plate (26) and a second conductive plate (27) respectively, the surface of the first conductive plate (26) is provided with a first clamping groove (28), the electrode contact of the decoupler (2) is clamped in the first clamping groove (28), the surface of the second conductive plate (27) is provided with a second clamping groove (29) and a third clamping groove (30), and when the telescopic contact (4) is clamped in the second clamping groove (29), the fixed contact (3) is located on the upper side of the third clamping groove (30).

5. A stable lightning protection device according to claim 4, characterized in that: The second excitation coil (32) is electrified to generate a magnetic repulsion force for pushing the magnetic column (17) to move outward, the connecting rod (18) extends outward and pushes the rotating arm (13) to rotate, so that the ratchet pawl (15) moves in a circle and drives the inner ring (6) to rotate, and the position of the resistance switching module (8) is switched.

6. The stable lightning protection device according to claim 4, wherein: The first excitation coil (31) is electrified to generate a magnetic attraction force for attracting the movable sleeve (12), the electrode contact on the movable sleeve (12) is separated from the first clamping groove (28), under the action of the weight of the lightning arrester body, the lightning arrester body falls over, and the end of the fixed contact (3) falls into the third clamping groove (30).

7. A stable lightning protection device according to claim 6, characterized in that: When the current flowing through the decoupler (2) increases, the first resistor (19) generates high temperature to detonate the thermal detonator (22), so that the decoupler (2) bursts, the lightning arrester body falls over, and the fixed contact (3) is hung at the third clamping groove (30).

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