A surge arrester

Abstract

The application belongs to the technical field of lightning arresters, and particularly relates to a lightning arrester, which comprises two lightning arresters, one of which is a main lightning arrester initially connected to a circuit, and the other is a standby lightning arrester in a standby state. The standby lightning arrester is externally sleeved with a detachable isolation component for isolating the erosion of the external environment on the standby lightning arrester and cutting off the electrical connection between the standby lightning arrester and an upper terminal block. A linkage mechanism is fixedly connected to the outside of a composite post insulator. When the main lightning arrester triggers a tripping action due to a fault, the isolation component is separated from the standby lightning arrester through the linkage mechanism, so that the two ends of the standby lightning arrester are respectively electrically connected to the upper terminal block and a lower terminal block, and the standby lightning arrester replaces the main lightning arrester to be connected to the circuit. The above-mentioned structure cooperation enables the standby lightning arrester to be quickly electrically connected to the circuit, seamlessly replaces the main lightning arrester to play a lightning protection role, and solves the industry pain point that a lightning protection vacuum period appears in a distribution line after the tripping of a traditional lightning arrester.

Description

Technical Field

[0001] This invention belongs to the field of surge arrester technology, specifically a surge arrester. Background Technology

[0002] A surge arrester is an electrical device used to protect electrical equipment from high transient overvoltages and to limit the duration and amplitude of follow current. Among them, drop-out surge arresters are widely used in 10kV and 35kV medium and low voltage distribution lines, substations, and distribution substations. They combine the overvoltage protection function of zinc oxide surge arresters with the fault-disconnection function of drop-out mechanisms. When the internal valve plate of the surge arrester deteriorates or breaks down, the fuse assembly melts, triggering the drop-out mechanism to trip, thus disconnecting the faulty surge arrester from the power grid and preventing short circuits or grounding faults.

[0003] However, the above technologies often have the following drawbacks: For example, traditional drop-out surge arresters generally adopt a structural design of composite post insulators, single surge arrester body and drop-out mechanism. When the surge arrester fails and drops out due to lightning overvoltage, long-term power frequency overvoltage or environmental erosion, the corresponding phase distribution line will directly lose lightning protection, forming a lightning protection vacuum period. If it encounters a secondary lightning strike or switching overvoltage, it is very easy to cause insulation breakdown, equipment burnout and other faults.

[0004] Therefore, the present invention provides a surge arrester. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology and solve the technical problem mentioned in the background art that the existing drop-out surge arrester is prone to a lightning protection vacuum period after the arrester breaks down.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the surge arrester of the present invention includes a composite post insulator, an upper terminal block and a lower terminal block, and also includes two surge arresters, one of which is the main surge arrester initially connected to the circuit, and the other is a standby surge arrester in a standby state.

[0007] An isolation component, which can be detachably fitted outside the standby surge arrester, is used to isolate the standby surge arrester from external environmental corrosion and to disconnect the electrical connection between the standby surge arrester and the upper terminal block.

[0008] The linkage mechanism is fixedly connected to the composite post insulator. When the main surge arrester is triggered to trip due to a fault, the linkage mechanism drives the isolation component to separate from the backup surge arrester, so that the two ends of the backup surge arrester are electrically connected to the upper terminal block and the lower terminal block respectively, and take over the circuit from the main surge arrester.

[0009] Furthermore, the upper terminal block is provided with an elastic conductive contact at the connection end of the surge arrester. The lower surface of the elastic conductive contact is integrally formed with a blocking strip for preventing the upper electrode of the surge arrester from detaching, and the cross-section of the blocking strip is wedge-shaped.

[0010] Furthermore, the isolation component includes two semi-cylindrical protective covers symmetrically arranged outside the standby surge arrester. An insulating plate is integrally formed on the upper end of the protective cover on the side away from the main surge arrester. The insulating plate is located between the elastic conductive contact and the upper electrode of the standby surge arrester to isolate the electrical connection between the two. Rubber connecting strips are provided on the mating sides of the two protective covers, and the cross-section of the rubber connecting strips is figure-eight shaped.

[0011] Furthermore, the thickness of the insulating plate is less than the thickness of the blocking strip by - millimeters, to prevent the backup surge arrester from tripping during the process of the insulating plate detaching.

[0012] Furthermore, the protective cover has annular sealing grooves at both the upper and lower ends, and a sealing ring is embedded in the sealing groove. The inner side of the sealing ring is interference-fitted with the outer shell of the standby surge arrester.

[0013] Furthermore, the linkage mechanism includes an insulating sleeve fitted over the composite post insulator. One side of the insulating sleeve has an integrally formed cantilever. The end of the cantilever away from the insulating sleeve has an installation groove. Two linkage rods are symmetrically arranged in the installation groove, and the linkage rods are rotatably connected to the cantilever via pins. The adjacent ends of the two linkage rods have a toothed structure that meshes with each other. The end of the linkage rod away from the cantilever has an elastic hook. One side of the protective cover has a slot adapted to the elastic hook, and a pull rod that engages with the elastic hook is provided in the slot.

[0014] Furthermore, the opening width of the hook portion of the elastic hook is smaller than the outer diameter of the pull rod, and the outer contour diameter of the hook portion of the elastic hook is larger than the distance between the inner wall of the slot and the outer wall of the pull rod.

[0015] The beneficial effects of this invention are as follows:

[0016] The surge arrester described in this invention replaces the traditional single-surge arrester structure with a dual-surge arrester configuration, isolation component, and linkage mechanism. The isolation component achieves a dual-core function, clearly distinguishing the two surge arresters as the initially operating main surge arrester and the standby backup surge arrester. Electrical isolation ensures the main surge arrester operates independently and accurately, while providing comprehensive protection for the backup surge arrester, isolating it from external erosion such as rainwater and dust, and preventing damage such as aging of the arrester skirt due to long-term exposure. This ensures performance stability in standby mode. The linkage mechanism establishes a mechanical linkage between the main surge arrester and the isolation component. When the main surge arrester trips due to breakdown, deterioration, or other faults, it directly drives the isolation component to separate, allowing the backup surge arrester to quickly establish electrical connection with the circuit and seamlessly take over the lightning protection function from the main surge arrester. This fundamentally solves the industry pain point of a lightning protection vacuum period in distribution lines after traditional surge arrester tripping, significantly improving the lightning protection reliability and power supply security of distribution networks, especially for critical load lines. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a perspective view of the invention from another angle;

[0020] Figure 3 This is a longitudinal sectional view of the present invention;

[0021] Figure 4 yes Figure 3 Enlarged view of a portion of point A in the middle;

[0022] Figure 5 This is a perspective view of the isolation component in this invention;

[0023] Figure 6 This is a cross-sectional view of the present invention;

[0024] Figure 7 yes Figure 6 Enlarged view of a section at point B in the middle;

[0025] Figure 8 yes Figure 6 Enlarged view of a section at point C;

[0026] Figure 9 This is a three-dimensional view of the linkage mechanism in this invention.

[0027] In the diagram: 1. Composite post insulator; 2. Upper terminal block; 3. Lower terminal block; 4. Surge arrester; 5. Isolation component; 6. Linkage mechanism; 7. Slot; 8. Pull rod; 21. Elastic conductive contact piece; 22. Blocking strip; 41. Main surge arrester; 42. Standby surge arrester; 50. Protective cover; 51. Insulating plate; 52. Rubber connecting strip; 53. Sealing ring; 60. Insulating sleeve; 61. Cantilever; 62. Linkage rod; 63. Elastic hook strip. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] Example 1: As Figures 1 to 5 As shown, the technical solution adopted by the present invention to solve its technical problem in this embodiment is as follows: The present invention includes a composite post insulator 1, an upper terminal block 2 and a lower terminal block 3, and also includes two surge arresters 4, one of which is the main surge arrester 41 initially connected to the circuit, and the other is a standby surge arrester 42 in a standby state. An isolation component 5 is detachably sleeved on the outside of the standby surge arrester 42 to isolate the external environment from the corrosion of the standby surge arrester 42 and to disconnect the electrical connection between the standby surge arrester 42 and the upper terminal block 2. This ensures that the main surge arrester 41 operates accurately and independently through electrical isolation, and also provides all-round protection for the standby surge arrester 42, isolating it from external corrosion such as rainwater and dust.

[0030] The linkage mechanism 6 is fixedly connected to the composite post insulator 1. When the main surge arrester 41 is triggered to trip due to a fault, the linkage mechanism 6 drives the isolation component 5 to separate from the backup surge arrester 42, so that the two ends of the backup surge arrester 42 are electrically connected to the upper terminal block 2 and the lower terminal block 3 respectively, and take over the circuit from the main surge arrester 41, so as to achieve the effect of the backup surge arrester 42 quickly connecting to the circuit and seamlessly taking over the lightning protection.

[0031] like Figure 3 and Figure 4 As shown, the upper terminal block 2 is provided with an elastic conductive contact 21 corresponding to the connection end of the surge arrester 4. The lower surface of the elastic conductive contact 21 is integrally formed with a blocking strip 22 for preventing the upper electrode of the surge arrester 4 from detaching, and the cross-section of the blocking strip 22 is wedge-shaped. Through the limiting effect of the blocking strip 22 on the surge arrester 4, the surge arrester 4 is more firmly attached to the elastic conductive contact 21 during normal operation, avoiding the phenomenon of loosening and falling off due to vibration.

[0032] The isolation component 5 includes two semi-cylindrical protective covers 50 symmetrically arranged outside the standby surge arrester 42. An insulating plate 51 is integrally formed on the upper end of the protective cover 50 on the side away from the main surge arrester 41. The insulating plate 51 is located between the elastic conductive contact 21 and the upper electrode of the standby surge arrester 42 to isolate the electrical connection between the two. Rubber connecting strips 52 are provided on the mating sides of the two protective covers 50. The cross-section of the rubber connecting strips 52 is shaped like an 8. The rubber connecting strips 52 realize the elastic connection between the two protective covers 50 and at the same time seal the connection seam between the two, further isolating external erosion such as rainwater and dust.

[0033] like Figure 4 To prevent the backup surge arrester 42 from accidentally tripping when the insulating plate 51 detaches, the thickness d1 of the insulating plate 51 is designed to be 1-3 mm smaller than the thickness d2 of the blocking strip 22.

[0034] like Figure 3 As shown, the upper and lower ends of the protective cover 50 are provided with annular sealing grooves, and sealing rings 53 are embedded in the sealing grooves. The inner side of the sealing rings 53 is interference-fitted with the outer shell of the standby surge arrester 42, which not only improves the sealing performance of the protective cover 50, but also allows the elastic deformation force released by the sealing rings 53 to push the two protective covers 50 outward when they separate, ensuring complete separation.

[0035] Example 2: Figures 6 to 9 As shown in Example 1, another embodiment of the present invention is as follows:

[0036] The linkage mechanism 6 includes an insulating sleeve 60 fitted outside the composite post insulator 1. One side of the insulating sleeve 60 has an integrally formed cantilever 61. The end of the cantilever 61 away from the insulating sleeve 60 has an installation groove. Two linkage rods 62 are symmetrically arranged in the installation groove. The linkage rods 62 and the cantilever 61 are rotatably connected by a pin. The adjacent ends of the two linkage rods 62 have a toothed structure that meshes with each other. The end of the linkage rod 62 away from the cantilever 61 has an elastic hook 63. One side of the protective cover 50 has a slot 7 that matches the elastic hook 63. The slot 7 has a pull rod 8 that engages with the elastic hook 63. When the main surge arrester 41 is disengaged and falls, it will push the corresponding linkage rod 62 to rotate counterclockwise. Through the meshing transmission of the toothed structure, it will drive the other linkage rod 62 to rotate clockwise in the opposite direction. Then, through the cooperation of the elastic hook 63 and the pull rod 8, it will drive the two protective covers 50 to separate.

[0037] like Figure 6 and Figure 7As shown, the opening width of the hook part of the elastic hook 63 is smaller than the outer diameter of the pull rod 8, and the outer contour diameter of the hook part of the elastic hook 63 is larger than the distance between the inner wall of the slot 7 and the outer wall of the pull rod 8. This design makes it easy for workers to replace the damaged main surge arrester 41 and reassemble it as a new backup surge arrester. The elastic hook 63 can be easily inserted into the slot 7 of the corresponding protective cover 50, and the elastic hook 63 is not easy to detach after being hooked with the pull rod 8, ensuring the reliability of the locking.

[0038] Working principle:

[0039] Initial state: The main surge arrester 41 is connected to the upper terminal block 2 and the lower terminal block 3, and undertakes the lightning protection function; the standby surge arrester 42 is sealed and protected by the isolation component 5 (isolates from external corrosion) and is isolated from the circuit by the insulating plate 51, and is in standby state. The wedge-shaped blocking strip 22 of the elastic conductive contact 21 ensures that the electrode is firmly attached and avoids accidental tripping.

[0040] Fault switching: After the main surge arrester 41 trips due to a fault, it falls due to its own gravity and pushes the linkage mechanism 6 to act, causing the isolation component 5 to separate. The protective cover 50 is opened by the elastic restoring force of the sealing ring 53, the insulating plate 51 is released, the upper electrode of the standby surge arrester 42 is quickly attached to the elastic conductive contact 21, and the lower end is connected to the lower terminal block 3, seamlessly taking over the lightning protection and eliminating the protection vacuum period;

[0041] Reset Cycle: The inspection personnel locate the fault by opening the protective cover 50 and dropping the main surge arrester 41. They retrieve the opened protective cover 50, replace the surge arrester with the new isolation component 5 at the failed main surge arrester 41, reset the linkage mechanism 6, and insert the elastic hook 63 into the slot 7 of the new protective cover 50 to realize the cyclic switching of the main and standby surge arrester positions.

[0042] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0043] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "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 limiting the scope of protection of this invention.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surge arrester, comprising a composite post insulator (1), an upper terminal block (2), and a lower terminal block (3), characterized in that: It also includes two surge arresters (4), one of which is the main surge arrester (41) for initial connection to the circuit, and the other is a standby surge arrester (42) in standby mode. Isolation component (5), which can be detachably sleeved outside the backup surge arrester (42) to isolate the backup surge arrester (42) from external environmental corrosion and to disconnect the backup surge arrester (42) from the electrical connection between the backup surge arrester (42) and the upper terminal block (2); Linkage mechanism (6), which is fixedly connected to composite post insulator (1), when the main surge arrester (41) is triggered to trip due to a fault, the linkage mechanism (6) drives the isolation component (5) to separate from the backup surge arrester (42), so that the two ends of the backup surge arrester (42) are electrically connected to the upper terminal block (2) and the lower terminal block (3) respectively, and take over the main surge arrester (41) from the circuit; The upper terminal block (2) is provided with an elastic conductive contact (21) at the connection end of the surge arrester (4). The lower surface of the elastic conductive contact (21) is integrally formed with a blocking strip (22) for preventing the upper electrode of the surge arrester (4) from detaching, and the cross section of the blocking strip (22) is wedge-shaped. The isolation component (5) includes two semi-cylindrical protective covers (50) symmetrically arranged outside the standby surge arrester (42). An insulating plate (51) is integrally formed on the upper end of the protective cover (50) away from the main surge arrester (41). The insulating plate (51) is located between the elastic conductive contact (21) and the upper electrode of the standby surge arrester (42) to isolate the electrical connection between the two. A rubber connecting strip (52) is provided on the mating side of the two protective covers (50), and the cross section of the rubber connecting strip (52) is in the shape of an 8.

2. A surge arrester according to claim 1, characterized in that: The thickness of the insulating plate (51) is 1-3 mm less than the thickness of the blocking strip (22) to prevent the backup surge arrester (42) from tripping during the process of the insulating plate (51) being removed.

3. A surge arrester according to claim 2, characterized in that: The protective cover (50) has annular sealing grooves at both the upper and lower ends, and a sealing ring (53) is embedded in the sealing groove. The inner side of the sealing ring (53) is interference-fitted with the outer shell of the standby surge arrester (42).

4. A surge arrester according to claim 3, characterized in that: The linkage mechanism (6) includes an insulating sleeve (60) sleeved on the outside of the composite post insulator (1). A cantilever (61) is integrally formed on one side of the insulating sleeve (60). An installation groove is provided at the end of the cantilever (61) away from the insulating sleeve (60). Two linkage rods (62) are symmetrically arranged in the installation groove. The linkage rods (62) and the cantilever (61) are rotatably connected by a pin. The adjacent ends of the two linkage rods (62) are provided with a tooth structure that meshes with each other. An elastic hook (63) is provided at the end of the linkage rod (62) away from the cantilever (61). A slot (7) adapted to the elastic hook (63) is provided on one side of the protective cover (50). A pull rod (8) that engages with the elastic hook (63) is provided in the slot (7).

5. A surge arrester according to claim 4, characterized in that: The opening width of the hook part of the elastic hook (63) is smaller than the outer diameter of the pull rod (8), and the outer contour diameter of the hook part of the elastic hook (63) is larger than the distance between the inner wall of the slot (7) and the outer wall of the pull rod (8).

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