Overvoltage protection device for power system

Abstract

The invention discloses a power system overvoltage protection device, and belongs to the technical field of power overvoltage protection. An overvoltage protection device of a power system comprises a main lightning arrester, a standby lightning arrester and a supporting frame used for bearing the main lightning arrester and the standby lightning arrester, the standby lightning arrester is detachably connected with the supporting frame through a second separation assembly, a first separation assembly is arranged on the lower portion of the main lightning arrester, and a second separation assembly is arranged on the lower portion of the standby lightning arrester. The first separating assembly is detachably connected to the second separating assembly through the connecting assembly. According to the invention, through the arrangement of the standby lightning arrester, the standby lightning arrester can be temporarily used as the main lightning arrester on the top of the standby lightning arrester after the main lightning arrester breaks down and then falls off through the first separation assembly, so that the vacuum period of protection is reduced; therefore, the problem that in the prior art, a drop-type lightning arrester for overvoltage protection has a protection vacuum period after a fault is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power overvoltage protection, and in particular to an overvoltage protection device for a power system. Background Art

[0002] Power system overvoltage protection devices are key equipment for ensuring the safety of power grid equipment and preventing insulation breakdown or equipment damage. Their design needs to be targeted at different types of overvoltages (such as atmospheric overvoltage, operating overvoltage, power frequency overvoltage, etc.) and protection objects (such as transmission lines, transformers, switchgear, etc.).

[0003] Lightning arresters are core protection devices used in power systems to limit lightning overvoltage and switching overvoltage. Their core principle is to quickly discharge excess overvoltage energy into the ground through their own characteristics of "high insulation at low voltage and low impedance at overvoltage", thereby preventing protected equipment (such as transformers, switchgear, etc.) from damage due to overvoltage breakdown.

[0004] The drop-type lightning arrester cleverly installs the lightning arrester body on the fusible drop mechanism, which makes it easy to detect and repair the lightning arrester without interrupting power supply. When the lightning arrester fails, the power frequency circuit breaker current can be used to activate the disconnector, so that the disconnector grounding terminal is automatically disconnected, so that the lightning arrester body falls out of operation, and then the operation and maintenance personnel go to the site to replace the new lightning arrester. The period from exiting operation to operation and maintenance to the site is a vacuum period. If overvoltage occurs during the vacuum period, the line and equipment cannot be effectively protected due to the lack of lightning arrester. To address this problem, the present application proposes a device that can greatly reduce the vacuum period. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that a drop-out arrester used for overvoltage protection has a protection vacuum period after a fault, and to propose an overvoltage protection device for a power system.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: An overvoltage protection device for an electric power system includes a main lightning arrester, a backup lightning arrester, and a support frame for carrying the main lightning arrester and the backup lightning arrester. The backup lightning arrester is detachably connected to the support frame via a second detachment component. A first detachment component is provided at the lower portion of the main lightning arrester, and the first detachment component is detachably connected to the second detachment component via a connection component.

[0007] Preferably, the support frame includes a mounting plate, an insulating support column and a support plate, the insulating support column is fixedly arranged on the top of the mounting plate, and the support plate is fixedly arranged on the top end of the insulating support column.

[0008] Preferably, the support frame also includes a conductive voltage plate for electrically connecting to the line, the conductive voltage plate is fixedly arranged on the top surface of the support plate, and the bottom surface of the conductive voltage plate is provided with a first groove and a second groove, the first groove is adapted to the top metal contact of the main lightning arrester, and the second groove is adapted to the top metal contact of the standby lightning arrester. The support frame also includes a protective cover, the protective cover is fixedly connected to the mounting plate and covers the conductive voltage plate, and an elastic member is provided between the protective cover and the conductive voltage plate.

[0009] Preferably, the second disengagement assembly includes a second shaft, a second support rod and a second connecting rod, the second shaft is fixedly arranged at the bottom end of the second support rod, the top end of the second support rod is hinged to the bottom end of the second connecting rod, and the second shaft is detachably connected to the mounting plate.

[0010] Preferably, the second disengagement assembly also includes a second support frame, one end of the second support frame is rotatably set on the second axis, and a reset component 2 is provided between the two, the other end of the second support frame is fixedly connected to the bottom of the disconnector of the standby lightning arrester, and the top end of the second connecting rod is fixedly connected to the standby lightning arrester.

[0011] Preferably, the connecting assembly includes a connecting frame, which is fixedly arranged at the end of the second shaft, and the first disengagement assembly is detachably connected to the connecting frame via a limiting assembly.

[0012] Preferably, the first disengagement assembly includes a first shaft, a first support rod and a first connecting rod, the first shaft is fixedly arranged at the bottom end of the first support rod, the bottom end of the first support rod is hinged to the top end of the first support rod, and the first shaft is placed in the hook groove of the connecting frame.

[0013] Preferably, the first disengagement assembly also includes a first support frame, one end of the first support frame is rotatably set on the first axis, and a reset member is provided between the two, the other end of the first support frame is fixedly connected to the bottom of the disconnector of the main lightning arrester, and the top end of the first support rod is fixedly connected to the main lightning arrester.

[0014] Preferably, the limiting assembly includes a limiting rod, an upper buckle, a lower buckle and a pull rod, the upper buckle and the limiting rod are fixedly set on the connecting frame, the lower buckle is rotatably set on the first support rod, one end of the pull rod is hinged to the buckle end of the lower buckle, and the other end is hinged to the first support frame.

[0015] Preferably, the support frame also includes a hook, which is fixedly arranged at the lower part of the mounting plate, and the second axis is placed in the hook groove of the hook. It also includes a lower pressure plate and an arc block, and the lower pressure plate is fixedly arranged on the lower bottom surface of the mounting plate. The arc block is fixedly arranged on the second support rod and away from the standby lightning arrester. The lower pressure plate can be pressed on the arc surface of the arc block, and a grounding plate is fixedly provided on the surface of the lower part of the support frame away from the hook.

[0016] Compared with the prior art, the present invention provides an overvoltage protection device for an electric power system, which has the following beneficial effects.

[0017] 1. The present invention provides a backup lightning arrester. When the main lightning arrester fails and then falls through the first separation component, the backup lightning arrester can be used temporarily as the main lightning arrester, reducing the vacuum period of protection, thereby solving the problem of the drop-type lightning arrester for overvoltage protection in the prior art having a protection vacuum period after a failure.

[0018] 2. The present invention can be used to connect the first detachable component and the second detachable component through the provided connecting component, which is equivalent to installing the main lightning arrester and the spare lightning arrester as a whole during installation, thereby achieving the purpose of convenient installation and overall disassembly and maintenance.

[0019] 3. The present invention can realize quick separation between the first separation component and the second component through the setting of the connection component. When the main lightning arrester fails, it falls behind under the action of the first separation component. The failed main lightning arrester can be directly removed and then a new main lightning arrester can be installed on the connection component.

[0020] 4. The present invention, through the provision of a limit assembly, can facilitate the first detachment assembly to be limited after being installed on the connection assembly, so that the first detachment assembly and the second detachment assembly form a whole. At the same time, when the main lightning arrester fails, the limit assembly can automatically release the limit, which is convenient for inspection personnel to quickly replace the main lightning arrester.

[0021] 5. In the present invention, when the main lightning arrester is activated, the backup lightning arrester can be kept away from the conductive plate, thereby preventing the backup lightning arrester from being too close to the conductive plate and causing an arc.

[0022] Other advantages, objects and features of the present invention will be described in part in the following description; and in part will be apparent to those skilled in the art based on an examination of the following; or may be taught from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the local cross-sectional structure of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the support frame in the present invention.

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the support frame in the present invention.

[0027] Figure 5 It is a structural schematic diagram of the backup lightning arrester and the second disconnection component in the present invention.

[0028] Figure 6 It is a structural schematic diagram of the main lightning arrester and the first disconnection component in the present invention.

[0029] Figure 7 It is a structural schematic diagram of the second separation component and the connecting frame in the present invention.

[0030] Figure 8 This is a schematic diagram of the structure of the first separation component in the present invention. Figure 1 .

[0031] Figure 9 This is a schematic diagram of the structure of the first separation component in the present invention. Figure 2 .

[0032] Figure 10 It is a schematic diagram of the assembled cross-sectional structure of the first detachable component and the second detachable component in the present invention.

[0033] Figure 11 This is a schematic diagram of the state in which the backup lightning arrester replaces the main lightning arrester in the present invention.

[0034] In the picture: 1. Mounting plate; 2. Insulating support column; 3. Support plate; 4. Conductive voltage plate; 5. Protective cover; 6. Main lightning arrester; 7. First support rod; 8. Connecting frame; 9. Second support rod; 10. Hook; 11. Grounding plate; 12. Spare lightning arrester; 13. Spring; 14. First connecting rod; 15. First support frame; 16. Pull rod; 17. Second support frame; 18. Second axis; 19. Arc block; 20. Lower pressure plate; 21. Second connecting rod; 22. First groove; 23. Second groove; 24. Second torsion spring; 25. Upper buckle; 26. Limit rod; 27. First axis; 28. Lower buckle; 29. ​​First torsion spring; 30. Disconnector. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner, and thus only show components related to the present invention.

[0036] Please refer to Figures 1-11 , an overvoltage protection device for an electric power system, comprising a main lightning arrester 6, a backup lightning arrester 12 and a support frame for carrying the main lightning arrester 6 and the backup lightning arrester 12, the backup lightning arrester 12 being detachably connected to the support frame through a second detachment component, a first detachment component being provided at the lower portion of the main lightning arrester 6, and the first detachment component being detachably connected to the second detachment component through a connecting component.

[0037] In a specific embodiment of the present invention, the supporting frame mainly plays a bearing role, and is used to carry the backup lightning arrester 12 and the main lightning arrester 6. Specifically, under normal conditions, the second detachment component and the backup lightning arrester 12 are a backup unit, and the first detachment component and the main lightning arrester 6 are a main unit. The two units form a whole through the connecting component, and the second detachment component and the supporting frame are connected; the main lightning arrester 6 is a commonly used lightning arrester, that is, the main lightning arrester 6 is always used for protection under normal conditions, and the backup lightning arrester 12 is a backup lightning arrester. When the main lightning arrester 6 falls due to a fault, it temporarily replaces the main lightning arrester 6 for use. When the inspection personnel finds the fault, after replacing the new main lightning arrester 6, they switch to the new main lightning arrester 6 for use; it should be noted that the backup lightning arrester 12 needs to be connected to the main lightning arrester 6. The main arrester 6 is of the same specification, and the working body of the two can adopt the main body of the existing drop-type arrester, that is, a disconnector 30 is provided at the bottom thereof, and the disconnector 30 can be selected to be hot-melt disconnected. The basic principle is: during normal operation, the current passing through the melt is small, and the heat generated is not enough to make the melt melt. When a fault occurs inside the arrester, such as aging of the zinc oxide valve plate, moisture, etc., which causes the valve plate to break down, the power frequency continuous current increases at this time, and the continuous current passes through the low-melting-point alloy melt. The heat generated increases the melt temperature, and the melt melts after reaching the melting point. After the melt melts (while in normal protection, the voltage is very high, but the passing time is extremely short, which is not enough to generate enough heat), under the action of the spring, the disconnector moves to separate the arrester from the system, and at the same time drives the main body of the arrester to fall, showing an obvious fault indication.

[0038] The support frame includes a mounting plate 1, an insulating support column 2 and a support plate 3. The insulating support column 2 is fixedly arranged on the top of the mounting plate 1, and the support plate 3 is fixedly arranged on the top of the insulating support column 2; the insulating support column 2 and the mounting plate 1 are fixedly connected by bolts, and the support plate 3 and the insulating support column 2 are fixedly connected by bolts; the insulating support column 2 can be selected from the support column of the existing drop-type lightning arrester.

[0039] The mounting plate 1 is the basic mounting support, that is, when installing this device, the mounting plate 1 needs to be installed in a suitable position, such as on the crossbeam of a utility pole (the specific installation position is determined according to the actual installation environment and is the same as the installation position of the existing lightning arrester). After fixing the mounting plate 1, the main lightning arrester 6 and the backup lightning arrester 12 can be installed on the mounting plate 1.

[0040] The support frame also includes a conductive voltage plate 4 for electrically connecting to the line. The conductive voltage plate 4 is fixedly arranged on the top surface of the support plate 3. The bottom surface of the conductive voltage plate 4 is provided with a first groove 22 and a second groove 23. The first groove 22 is adapted to the top metal contact of the main lightning arrester 6, and the second groove 23 is adapted to the top metal contact of the standby lightning arrester 12. The support frame also includes a protective cover 5, which is fixedly connected to the mounting plate 1 and covers the conductive voltage plate 4. An elastic member is provided between the protective cover 5 and the conductive voltage plate 4.

[0041] The outer end of the conductive plate 4 is electrically connected to the line for conducting the circuit; when the top metal contact of the lightning arrester contacts the conductive plate 4, the bottom metal terminal of the lightning arrester is connected to the ground, and when there is overvoltage, the excess overvoltage energy is quickly discharged into the ground; the conductive plate 4 has a certain elasticity.

[0042] During normal use, the metal contact of the main lightning arrester 6 is located in the first groove 22, so that the main lightning arrester 6 is connected to the conductive voltage plate 4; when the main lightning arrester 6 fails, the metal contact of the backup lightning arrester 12 is located in the second groove 23, so that the backup lightning arrester 12 is connected to the conductive voltage plate 4; in addition, when the metal contact is located in the groove, it can improve a certain contact stability.

[0043] The protective cover 5 is in an inverted concave shape and is mainly used to protect the internal conductive voltage plate 4, metal contacts and elastic parts, preventing foreign objects from hitting the connection between the metal contacts and the conductive voltage plate 4, further improving the contact stability between the two, and at the same time protecting the elastic parts to ensure their working stability.

[0044] The elastic member is mainly used to apply a certain downward pressure to the conductive plate 4 to make the contact between the metal contact and the conductive plate 4 closer. In this solution, the elastic member is a spring 13 for applying pressure.

[0045] The second disengagement assembly includes a second shaft 18, a second support rod 9 and a second connecting rod 21. The second shaft 18 is fixedly arranged at the bottom end of the second support rod 9. The top end of the second support rod 9 is hinged to the bottom end of the second connecting rod 21. The second shaft 18 is detachably connected to the mounting plate 1.

[0046] The second disengagement assembly also includes a second support frame 17, one end of the second support frame 17 is rotatably set on the second shaft 18, and a reset component 2 is provided between the two. The other end of the second support frame 17 is fixedly connected to the bottom of the disconnector 30 of the standby lightning arrester 12, and the top of the second connecting rod 21 is fixedly connected to the standby lightning arrester 12.

[0047] The top end of the second connecting rod 21 and the standby lightning arrester 12 can be fixedly connected by a clamp, that is, the clamp holds the lower column of the standby lightning arrester 12, and the clamp and the second connecting rod 21 are fixedly connected by bolts.

[0048] In this solution, the second reset component uses a second torsion spring 24, which is sleeved on the second shaft 18. One end of the second torsion spring 24 is connected to the second support rod 9, and the other end is fixedly connected to the second support frame 17. The second torsion spring 24 is used to apply an opening force to the second support rod 9 and the second support frame 17.

[0049] The normal state after the second disconnection component is connected to the standby lightning arrester 12 is as follows Figure 5 As shown, since the second connecting rod 21 and the backup lightning arrester 12 are fixedly connected, the second support frame 17 is fixedly connected to the corresponding disconnector 30, and the disconnector 30 is fixedly connected to the backup lightning arrester 12, in this state, the relative positions of the various components will not change; if the backup lightning arrester 12 replaces the main lightning arrester 6 and a failure occurs during use (the second disconnection component of the backup lightning arrester 12 mainly deals with this extreme situation), after the disconnector 30 melts, under the action of the second torsion spring 24 and the built-in spring of the disconnector 30, the second support frame 17 will rotate around the second axis 18, so that the outer end of the second support frame 17 is away from the bottom of the backup lightning arrester 12, so that the backup lightning arrester 12 loses the restriction of the second support frame 17, and the second connecting rod 21 and the second support rod 9 can rotate relative to each other, causing the backup lightning arrester 12 to fall under the action of gravity and disconnect from the line.

[0050] The connecting assembly includes a connecting frame 8, which is fixedly arranged at the end of the second shaft 18. The first disengagement assembly is detachably connected to the connecting frame 8 through a limiting assembly.

[0051] The first disengagement assembly includes a first shaft 27, a first support rod 7 and a first connecting rod 14. The first shaft 27 is fixedly arranged at the bottom end of the first support rod 7. The bottom end of the first support rod 7 is hinged to the top end of the first support rod 7. The first shaft 27 is placed in the hook groove of the connecting frame 8.

[0052] The first disengagement assembly also includes a first support frame 15, one end of the first support frame 15 is rotatably set on the first shaft 27, and a reset component is provided between the two. The other end of the first support frame 15 is fixedly connected to the bottom of the disconnector 30 of the main lightning arrester 6, and the top of the first support rod 7 is fixedly connected to the main lightning arrester 6.

[0053] The connection method between the first connecting rod 14 and the main lightning arrester 6 can adopt the connection method between the second connecting rod 21 and the backup lightning arrester 12, which will not be described in detail here.

[0054] In this solution, the first torsion spring 29 is selected as the reset component, and the first torsion spring 29 is mounted on the first shaft 27. One end of the first torsion spring 29 is connected to the first support rod 7, and the other end is fixedly connected to the first support frame 15. The first torsion spring 29 is used to apply an opening force to the first support rod 7 and the first support frame 15.

[0055] The normal state after the first disconnection component is connected to the main lightning arrester 6 is as follows Figure 6 As shown, since the first connecting rod 14 and the main lightning arrester 6 are fixedly connected, the first support frame 15 is fixedly connected to the corresponding disconnector 30, and the disconnector 30 is fixedly connected to the main lightning arrester 6, in this state, the relative positions of the various components will not change; when the disconnector 30 of the main lightning arrester 6 is blown, under the action of the first torsion spring 29 and the combined action of the built-in spring of the disconnector 30, the first support frame 15 will rotate around the first axis 27, so that the outer end of the first support frame 15 is away from the bottom of the main lightning arrester 6, so that the main lightning arrester 6 loses the restriction of the first support frame 15, and the first connecting rod 14 and the first support rod 7 can rotate relative to each other, causing the main lightning arrester 6 to fall under the action of gravity and detach from the line.

[0056] The limiting assembly includes a limiting rod 26, an upper buckle 25, a lower buckle 28 and a pull rod 16. The upper buckle 25 and the limiting rod 26 are fixedly set on the connecting frame 8, and the lower buckle 28 is rotatably set on the first support rod 7. One end of the pull rod 16 is hinged to the buckle end of the lower buckle 28, and the other end is hinged to the first support frame 15.

[0057] Since the relative positions of the various components of the main lightning arrester 6 will not change under normal conditions, the lower buckle 28 will not change position under the joint action of the pull rod 16 and the first support frame 15; the limit rod 26 is used to resist the first support rod 7 to prevent the main lightning arrester 6 from touching the backup lightning arrester 12.

[0058] When the main lightning arrester 6 and the second detachment assembly are installed on the second detachment assembly, that is, when they are installed on the connecting frame 8, after placing the first shaft 27 in the front end hook groove of the connecting frame 8, the second detachment assembly is rotated so that the lower buckle 28 is engaged with the upper buckle 25 (in order to enable the upper buckle 25 and the lower buckle 28 to be smoothly engaged together, the upper buckle 25 can be set to have a certain elasticity), and at this time the first support rod 7 is just close to the limit rod 26, and the installation is completed. In this state, the main lightning arrester 6 and the second detachment assembly cannot change their relative position with the connecting assembly, that is, the first shaft 27 cannot rotate around the axis under the restriction of the limit assembly; if it is necessary to manually release the limit, only the upper buckle 25 needs to be dialed upward to separate it from the lower buckle 28, and then removed.

[0059] The support frame also includes a hook 10, which is fixedly arranged at the lower part of the mounting plate 1, and the second shaft 18 is placed in the hook groove of the hook 10; it also includes a lower pressure plate 20 and an arc block 19, the lower pressure plate 20 is fixedly arranged on the lower bottom surface of the mounting plate 1, the arc block 19 is fixedly arranged on the second support rod 9, and is away from the standby lightning arrester 12, the lower pressure plate 20 can be pressed on the arc surface of the arc block 19, and the lower pressure plate 20 can apply downward pressure to the arc block 19, so that the position of the second shaft 18 in the hook 10 is more stable; a grounding plate 11 is fixedly arranged on the surface of the lower part of the support frame away from the hook 10, and the grounding plate 11 is grounded through a wire, and the bottom terminals of the main lightning arrester 6 and the standby lightning arrester 12 are respectively connected to the grounding plate 11 through wires.

[0060] Installation process: In the initial state of this device, the main unit is connected to the backup unit, and the two form an integral lightning arrester through the connecting components, and the relative positions of the various parts cannot change. During installation, first install the support frame to the designed position, that is, install and fix the mounting plate 1 to the designed position, and then install the integral lightning arrester to the support frame. During installation, place the second shaft 18 in the hook groove of the hook 10, and then rotate it upward around the axis of the second shaft 18 to make the metal contact of the main lightning arrester 6 enter the first groove 22. The first groove 22 limits the metal contact and the pressure exerted by the elastic member on the conductive voltage plate 4 can keep the integral lightning arrester in a stable state. Then use wires to connect the main lightning arrester 6 and the backup lightning arrester 12 respectively (the wires are not shown in the figure). The state after installation is completed can be referred to. Figure 1 and Figure 2 .

[0061] When the main lightning arrester 6 fails, the power frequency continuous current increases, and the continuous current passes through the low melting point alloy melt. The heat generated increases the melt temperature, and the melt melts after reaching the melting point. After the disconnector 30 melts, the first support frame 15 will be separated from the main lightning arrester 6 under the action of the first torsion spring 29 and the built-in spring of the disconnector 30. Then the main lightning arrester 6 loses the restriction of the first support frame 15 and falls by gravity, that is, it rotates around the axis of the first shaft 27. At the same time, the entire lightning arrester loses the limit of the first groove 22, and the connection The frame 8 and the backup unit will also rotate around the axis of the second shaft 18, and the gravity of the backup unit plus the weight of the main unit will make the metal contact of the backup lightning arrester 12 enter the second groove 23, replacing the main lightning arrester 6 for temporary protection. At the same time, when the first support frame 15 is separated from the main lightning arrester 6, it will drive the pull rod 16 to move, so that the pull rod 16 pulls the lower buckle 28 to separate it from the upper buckle 25, achieving the effect of contact limit. The state after the main lightning arrester 6 falls and the backup lightning arrester 12 is replaced can be seen in the figure. Figure 11 .

[0062] After the inspection personnel arrive at the scene, since the first detachable component has been unlocked from the connecting frame 8, the first detachable component and the faulty main lightning arrester 6 can be directly removed, and then the new first detachable component and the main lightning arrester 6 can be installed. During installation, the first shaft 27 is placed in the hook groove of the connecting frame 8, and then rotated around the axis of the first shaft 27 to make the lower buckle 28 and the upper buckle 25 engage to complete the connection between the first detachable component and the connecting component. At this time, an integral lightning arrester is formed, and then the integral lightning arrester is rotated around the second shaft 18 The axis of the main lightning arrester 6 is rotated to separate the spare lightning arrester 12 from the second groove 23 and the conductive voltage plate 4. Then, the metal contact of the new main lightning arrester 6 is inserted into the first groove 22 to complete the replacement of the main lightning arrester 6. If it is replaced together with the spare lightning arrester 12, the main lightning arrester 6 can be removed and the spare lightning arrester 12 can be removed at the same time. The removal process is the same as the removal method of the existing drop-type lightning arrester. After removal, a new integral lightning arrester can be directly installed.

[0063] By setting the standby lightning arrester 12 to be farther away from the conductive voltage plate 4 when it is not enabled, the possibility of arc generation can be effectively avoided; when the standby lightning arrester 12 is enabled, the connection between the standby lightning arrester 12 and the conductive voltage plate 4 is exactly the same as the connection between the main lightning arrester 6 and the conductive voltage plate 4, so it can achieve a good replacement effect, and is relatively convenient and quick when replacing or replacing the entire device.

[0064] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0065] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An overvoltage protection device for an electric power system, comprising a main lightning arrester (6), a backup lightning arrester (12), and a support frame for carrying the main lightning arrester (6) and the backup lightning arrester (12), characterized in that: The backup lightning arrester (12) is detachably connected to the support frame via a second detachable assembly, and a first detachable assembly is provided at the lower portion of the main lightning arrester (6), and the first detachable assembly is detachably connected to the second detachable assembly via a connecting assembly.

2. The power system overvoltage protection device according to claim 1, characterized in that: The support frame comprises a mounting plate (1), an insulating support column (2) and a support plate (3), wherein the insulating support column (2) is fixedly arranged on the top of the mounting plate (1), and the support plate (3) is fixedly arranged on the top end of the insulating support column (2).

3. The power system overvoltage protection device according to claim 2, characterized in that: The support frame further comprises a conductive plate (4), the conductive plate (4) being fixedly arranged on the top surface of the support plate (3), and the bottom surface of the conductive plate (4) being provided with a first groove (22) and a second groove (23).

4. The power system overvoltage protection device according to claim 2, characterized in that: The second disengagement assembly comprises a second shaft (18), a second support rod (9) and a second connecting rod (21), wherein the second shaft (18) is fixedly arranged at the bottom end of the second support rod (9), the top end of the second support rod (9) is hinged to the bottom end of the second connecting rod (21), and the second shaft (18) is detachably connected to the mounting plate (1).

5. The power system overvoltage protection device according to claim 4, characterized in that: The second disengagement assembly further comprises a second support frame (17), one end of the second support frame (17) being rotatably arranged on a second shaft (18), and a second reset member is provided between the second support frame (17), the other end of the second support frame (17) being fixedly connected to the bottom of the disengagement device (30) of the standby lightning arrester (12), and the top end of the second connecting rod (21) being fixedly connected to the standby lightning arrester (12).

6. The power system overvoltage protection device according to claim 4, characterized in that: The connecting assembly comprises a connecting frame (8), the connecting frame (8) is fixedly arranged at the end of the second shaft (18), and the first disengagement assembly is detachably connected to the connecting frame (8) via a limiting assembly.

7. The power system overvoltage protection device according to claim 6, characterized in that: The first disengagement assembly comprises a first shaft (27), a first support rod (7) and a first connecting rod (14), wherein the first shaft (27) is fixedly arranged at the bottom end of the first support rod (7), the bottom end of the first support rod (7) is hinged to the top end of the first support rod (7), and the first shaft (27) is placed in a hook groove of the connecting frame (8).

8. The power system overvoltage protection device according to claim 7, characterized in that: The first disconnect assembly further comprises a first support frame (15), one end of the first support frame (15) being rotatably arranged on a first shaft (27), and a reset member 1 being arranged between the first support frame (15), the other end of the first support frame (15) being fixedly connected to the bottom of the disconnector (30) of the main lightning arrester (6), and the top end of the first support rod (7) being fixedly connected to the main lightning arrester (6).

9. The power system overvoltage protection device according to claim 8, characterized in that: The limiting assembly includes a limiting rod (26), an upper buckle (25), a lower buckle (28) and a pull rod (16), wherein the upper buckle (25) and the limiting rod (26) are fixedly arranged on the connecting frame (8), and the lower buckle (28) is rotatably arranged on the first support rod (7). One end of the pull rod (16) is hinged to the buckle end of the lower buckle (28), and the other end is hinged to the first support frame (15).

10. The power system overvoltage protection device according to claim 4, characterized in that: The support frame further comprises a hook (10), wherein the hook (10) is fixedly arranged at the lower part of the mounting plate (1), and the second shaft (18) is placed in a hook groove of the hook (10).

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