Lightning arrester fault indicating device and lightning arrester

Abstract

The invention discloses a lightning arrester fault indicating device, belongs to the field of electrical elements, solves the problem that a fault indicating device in the prior art affects a power transmission line, and adopts the technical scheme that the lightning arrester fault indicating device comprises a shell, and a through hole for a rod body of a lightning arrester to pass through is formed in the center area of the shell; a through hole is formed in the shell, a containing cavity is formed in the shell and surrounds the outer ring wall of the through hole, an induction coil is arranged in the containing cavity and surrounds the through hole, an electronic exploder and an identification belt are arranged in the containing cavity and located on the outer side of the induction coil, and an air gap is formed between the electronic exploder and the induction coil; one end of the identification belt is fixed in the containing cavity, the other end of the identification belt is a free end, the shell is provided with an opening for the identification belt to penetrate out of the containing cavity and a cover plate for closing the opening, and when the induced current triggers the electronic exploder to explode, the cover plate is pushed open by high-pressure air generated by explosion, and the identification belt is blown out from the opening. The invention also aims at disclosing the lightning arrester.

Description

Technical Field

[0001] This invention relates to the field of electrical components, and in particular to a surge arrester fault indication device and a surge arrester. Background Technology

[0002] Currently, most surge arresters lack effective fault indication functions, making it difficult to detect damage or performance degradation during operation in a timely manner. This hinders maintenance personnel from quickly locating the fault, impacting the safe operation and maintenance efficiency of the power system. However, existing technologies, such as the fault indication and live-line disassembly structure disclosed in Chinese invention patent CN112750584A, exist. This structure includes the surge arrester body, connecting cylinder, connecting rod, insulating support, and support plate. The conductive end of the surge arrester at the top engages with the connecting rod via the connecting cylinder and is fixed by a lifting eye bolt. The connecting rod is connected to the insulating support, and the top of the insulating support is connected to a live-line clamp via a wire. The other end of the clamp is pressed and fixed to the high-voltage insulated conductor. A ball-head electrode is located at the lower end of the surge arrester, forming an air gap with the support plate. The surface of the ball-head electrode is coated with a thermochromic material; when the surge arrester heats up due to a fault, the thermochromic material changes from red to black, thus providing a direct indication of the fault status. However, this solution requires series connection to the transmission line via a wire, which may interfere with the normal operation of the transmission line. Summary of the Invention

[0003] The objective of this invention is to provide a surge arrester fault indication device that solves the problem of fault indication devices affecting transmission lines in the prior art and reduces the impact of fault indication devices on transmission lines.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a surge arrester fault indication device, comprising a housing, wherein a through hole is provided in the central region of the housing for the surge arrester rod to pass through, a receiving cavity is formed in the outer ring wall of the housing surrounding the through hole, an induction coil is arranged in the receiving cavity around the through hole, an electronic detonator and an identification strip are arranged in the receiving cavity outside the induction coil, an air gap is provided between the electronic detonator and the induction coil, one end of the identification strip is fixed in the receiving cavity, and the other end is a free end, the housing is provided with an opening for the identification strip to pass through the receiving cavity and a cover plate for closing the opening, when the induced current triggers the electronic detonator to detonate, the cover plate is pushed open by the high-pressure air generated by the explosion, and the identification strip is blown out from the opening.

[0005] After adopting the above technical solution, the present invention has the following advantages: the arrester rod passes through the shell without being directly connected to the internal induction coil, and the arrester fault indication device does not need to be connected to the main circuit, fundamentally avoiding interference with the normal operation of the transmission line. Relying on the change of induced current in the induction coil, the induction coil generates an electromagnetic induction voltage. When the current is large enough to break down the air gap between the electronic detonator and the electronic detonator, an electric arc is triggered. The electric arc detonates the explosive inside the electronic detonator, and the explosive rapidly releases a large amount of energy. Most of this energy is released in the form of heat, which instantly heats the air in the containment cavity and generates high-temperature and high-pressure gas. The high-temperature and high-pressure gas diffuses to the surroundings at a high speed to impact the cover plate and the marking strip, causing the cover plate to pop out from the opening and the marking strip to float out of the shell with the high-temperature and high-pressure gas, forming a clear visual signal that can be quickly identified even at a long distance or in bad weather. This helps maintenance personnel to quickly locate the fault point, improve inspection efficiency and emergency response capabilities. When the current is small enough not to break down the air gap of the electronic detonator, the arrester fault indication device will not activate, ensuring as much as possible that the arrester will not be falsely reported as faulty when it is working normally.

[0006] Furthermore, the housing is provided with a first partition that separates the through hole and the receiving cavity, and the first partition is an insulating partition.

[0007] Through the above technical solution, the first partition physically isolates the induction coil from the surge arrester without changing the original line structure, without affecting the normal operation of the power transmission system, and improves the safety and stability of the overall system.

[0008] Furthermore, the housing is provided with a second partition that divides the receiving cavity into a first cavity and a second cavity. The induction coil is located in the first cavity, and the marking strip is located in the second cavity. The electronic detonator includes a trigger end and an explosive end. The trigger end of the electronic detonator is located in the first cavity, and the explosive end of the electronic detonator is located in the second cavity. The fault current passes through the induction coil, and the induction coil generates an electromagnetic induction voltage that breaks down the air gap at the trigger end to trigger an electric arc and detonate the explosive end. This causes the air in the second cavity to be heated, pushing the cover plate open and pushing the marking strip out of the second cavity.

[0009] The above technical solution achieves the partitioned execution of electromagnetic induction and mechanical triggering functions, avoiding direct damage to the marking strip from arc discharge and high-temperature gas, while limiting the range of explosive energy and minimizing damage to sensitive components such as induction coils caused by triggering arcs and explosive impacts, thus improving overall safety and stability. In addition, the second cavity provides an independent space for the marking strip to pop out, so that the energy of the air in the second cavity that expands due to heat when the explosive end is detonated is concentrated on the cover plate and the marking strip, ensuring that it pops out quickly and powerfully, forming a conspicuous indication. Compared with a non-partitioned structure, it effectively avoids energy dispersion, ensures the height and speed requirements for the marking strip to pop out, and enhances the practical application effect of the device.

[0010] Furthermore, the second partition includes an arc-shaped segment protruding from the first cavity toward the second cavity, the inner side of the arc-shaped segment forming a clearance space for the induction coil, and the marking strip abutting against the outer surface of the arc-shaped segment.

[0011] By adopting the aforementioned technical solution, the clearance space formed on the inner side of the arc segment provides an independent installation area for the induction coil, avoiding direct contact between it and the second partition plate. This helps to ensure the installation accuracy and electromagnetic induction stability of the induction coil. The marking strip abuts against the outer surface of the arc segment, and the arc surface applies pre-bending stress to it, so that the marking strip remains compactly folded in the untriggered state. This not only saves the axial space of the second cavity, but also effectively prevents entanglement or jamming caused by the loose marking strip. It ensures that the marking strip can be smoothly ejected along the arc trajectory when triggered, improving the release reliability and visual prompting effect.

[0012] Furthermore, the opening of the receiving cavity is located in the second cavity, and the outer surface of the arc-shaped segment is positioned close to the opening of the receiving cavity.

[0013] Using the aforementioned technical solution, if the partition is a planar structure, the airflow generated by the explosion may form a countercurrent turbulence perpendicular to the cover plate within the second cavity, leading to energy dispersion and reducing the effective force pushing the marker tape against the cover plate. In this solution, the marker tape rests against the outer side of the arc-shaped section near the opening, its initial position already close to the outlet of the receiving cavity, which helps shorten the ejection stroke. Simultaneously, the curved surface structure of the arc-shaped section guides the airflow generated by the explosion, causing it to flow tangentially, reducing turbulence loss and avoiding energy waste. Furthermore, the outer side of the arc-shaped section, acting as a reflective surface, can create a focusing effect similar to a "trumpet mouth" when the airflow impacts, concentrating most of the explosion energy towards the cover plate and marker tape, thereby effectively increasing the opening speed of the cover plate and the ejection force of the marker tape, ensuring the effective ejection of the marker tape.

[0014] Furthermore, the free end of the marking strip has a weight.

[0015] By adopting the aforementioned technical solution, after a weight is placed at the free end of the identification strip, the weight of the weight can be used to keep the identification strip more stably in the pre-folded state in the second cavity when it is not triggered, avoiding loosening, displacement or jamming caused by wind or vibration, and improving the reliability of the device operation. At the same time, when the triggering action is activated, the weight can be pushed out quickly along with the identification strip by the explosive airflow, and its inertia can enhance the stability and directionality of the identification strip unfolding, preventing the identification strip from rolling or deviating from the trajectory during the release process as much as possible, thereby ensuring that it extends smoothly out of the shell and fully unfolds to form a conspicuous reminder.

[0016] Furthermore, the free end of the marking strip is fixedly connected to the cover plate.

[0017] The above technical solution addresses the high safety requirements of surge arresters used in high-altitude environments. Traditional ejector-type cover structures pose a risk of falling objects. By fixing the marking strip to the cover, the cover remains connected to the casing after activation, preventing detachment and effectively preventing injury to equipment or personnel below, thus improving overall safety. Furthermore, during detonation, high-temperature, high-pressure gas first acts on the cover, causing it to open rapidly. The marking strip, however, experiences relatively less airflow impact, potentially leading to insufficient deployment. Fixing the marking strip to the cover allows it to unfold simultaneously with the cover's opening, compensating for insufficient force on the strip and ensuring smooth and complete deployment for a clear warning.

[0018] Furthermore, the cover plate has a groove for avoiding the marking strip on the side facing the receiving cavity.

[0019] With the above technical solution, when the device is not triggered, the identification strip is contained within the second cavity, with its free end close to the inner side of the cover plate. If the inner surface of the cover plate is a planar structure, the identification strip may be compressed by the cover plate in the folded state, leading to folding deformation, jamming, or increased release resistance, affecting the reliability of the operation. By providing a groove on the inner side of the cover plate, clearance space can be provided for the identification strip, allowing it to maintain its natural folded shape in the untriggered state and avoiding deformation or frictional resistance due to pressure.

[0020] Furthermore, the through hole includes a first hole segment and a second hole segment arranged along the axis, wherein the diameter of the first hole segment is larger than the diameter of the second hole segment to form an installation step for connection with the surge arrester.

[0021] With the above technical solution, the surge arrester usually needs to be inserted into the surge arrester fault indication device at a certain depth. By designing the through hole as a two-section structure with different diameters and forming an installation step at the connection, axial limit can be provided for the installation of the surge arrester. The installation step can also serve as a support surface at the bottom of the surge arrester, improving its installation stability in the housing.

[0022] Another object of the present invention is to provide a surge arrester, including a pole and a surge arrester fault indication device as described in the above-mentioned technical solution mounted on the pole, wherein the pole passes through a through hole of the surge arrester fault indication device, and the pole and the induction coil are spaced apart.

[0023] With the above technical solution, the surge arrester rod passes through the housing without being directly connected to the induction coil inside the device, and the surge arrester fault indication device does not need to be connected to the main circuit, thus fundamentally avoiding interference with the normal operation of the transmission line. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a cross-sectional view of the surge arrester fault indication device of the present invention;

[0026] Figure 2 This is a cross-sectional view of the surge arrester fault indication device of the present invention from another perspective;

[0027] Figure 3 This is a schematic diagram of the structure of the surge arrester fault indication device of the present invention;

[0028] Figure 4 This is a schematic diagram of the lightning arrester of the present invention;

[0029] Figure 5 This is a schematic diagram showing the location of the surge arrester of the present invention installed on the power transmission line;

[0030] In the diagram, 1. Surge arrester fault indicator; 10. Housing; 11. Induction coil; 12. Electronic detonator; 121. Trigger end; 122. Explosion end; 13. Identification strip; 131. Fixed end; 132. Free end; 14. Receiving cavity; 141. Opening; 142. Clearance space; 143. First cavity; 144. Second cavity; 15. Cover plate; 151. Groove; 16. Through hole; 161. First hole section; 162. Second hole section; 163. Mounting step; 17. Air gap; 18. First partition plate; 19. Second partition plate; 191. Arc-shaped section; 192. Outer surface; 20. Circuit board; 31. Rod; 32. Metal oxide resistor sheet; 4. Insulator; 5. Transmission line. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0033] It should be understood that in the various embodiments of the present invention, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0034] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0035] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0036] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0037] Example 1:

[0038] like Figures 1 to 3As shown, the present invention provides a surge arrester fault indication device, including a housing 10. The central region of the housing 10 is provided with a through hole 16 for the surge arrester rod 31 to pass through. A receiving cavity 14 is formed in the outer ring wall of the housing 10 surrounding the through hole 16. An induction coil 11 is arranged in the receiving cavity 14 around the through hole 16. An electronic detonator 12 and an identification strip 13 are arranged in the receiving cavity 14 outside the induction coil 11. An air gap 17 is provided between the electronic detonator 12 and the induction coil 11. One end of the identification strip 13 is fixed in the receiving cavity 14, and the other end is a free end 132. The housing 10 is provided with an opening 141 for the identification strip 13 to pass through the receiving cavity 14 and a cover plate 15 for closing the opening 141. When the induced current triggers the electronic detonator 12 to detonate, the cover plate 15 is pushed open by the high-pressure air generated by the explosion, and the identification strip 13 is blown out from the opening 141.

[0039] The surge arrester's rod 31 passes through the housing 10 without being directly connected to the internal induction coil 11. Figure 5 As shown, the surge arrester fault indication device 1 does not need to be connected to the main circuit's power transmission line, fundamentally avoiding interference with the normal operation of the power transmission line 5. Relying on the change in induced current in the induction coil 11, the induction coil 11 generates an electromagnetic induction voltage. When the current is large enough, it is sufficient to break down the air gap 17 between the electronic detonator 12 and the electronic detonator 12, triggering an electric arc. The electric arc ignites the explosive inside the electronic detonator 12, and the explosive rapidly releases a large amount of energy, most of which is released as heat, instantly heating the air inside the containment cavity 14 and generating high-temperature, high-pressure gas. The gas diffuses outwards at a high speed, impacting the cover plate 15 and the marking strip, causing the cover plate 15 to pop out from the opening 141. The marking strip 13 floats out of the housing 10 with the high-temperature and high-pressure gas, forming a clear visual signal that can be quickly identified even at a distance or in bad weather. This helps maintenance personnel to quickly locate the fault point, improve inspection efficiency and emergency response capabilities. When the current is small and insufficient to break down the air gap 17 of the electronic detonator 12, the surge arrester fault indicator 1 will not activate, ensuring as much as possible that the surge arrester will not be falsely reported as faulty when it is working normally.

[0040] It should be noted that a circuit board 20 is also provided inside the receiving cavity 14. The circuit board 20 is electrically connected to the induction coil 11, and the electronic detonator 12 is also electrically connected to the circuit board 20. When the current is large enough to break down the air gap 17 of the electronic detonator 12 and induce an electric arc, the circuit board 20 needs to control the electronic detonator 12 to start simultaneously. The circuit board 20 will only control the electronic detonator 12 to start when the current duration reaches the target value, thus avoiding false activation caused by instantaneous excessive current. The surge arrester fault indicator 1 and the transmission line 5 are spaced apart and are not connected by wires.

[0041] Specifically, the housing 10 is provided with a first partition 18 that separates the through hole 16 and the receiving cavity 14. The first partition 18 is an insulating partition, which physically isolates the induction coil 11 from the arrester rod 31 without changing the original circuit structure or affecting the normal operation of the power transmission system, thus improving the overall system safety and stability. It should be noted that only a sufficiently large current can break down the first partition 18 to detonate the electronic detonator 12; a smaller current will not break down the first partition 18.

[0042] The housing 10 is further provided with a second partition 19 that divides the receiving cavity 14 into a first cavity 143 and a second cavity 144. The induction coil 11 is located in the first cavity 143, and the marking strip 13 is located in the second cavity 144. The electronic detonator 12 includes a trigger end 121 and an explosive end 122. The trigger end 121 of the electronic detonator 12 is located in the first cavity 143, and the explosive end 122 of the electronic detonator 12 is located in the second cavity 144. When a fault current passes through the induction coil 11, the induction coil 11 generates an electromagnetic induction voltage that breaks down the air gap 17 of the trigger end 121 to trigger an electric arc and detonate the explosive end 122. This causes the air in the second cavity 144 to be heated, pushing the cover plate 15 to open and pushing the marking strip 13 out of the second cavity 144. The partitioned execution of electromagnetic induction and mechanical triggering functions avoids direct damage to the marking strip 13 from arc discharge and high-temperature gas, while limiting the range of explosive energy and minimizing damage to sensitive components such as the induction coil 11 caused by triggering arc and explosive impact, thus improving overall safety and stability. In addition, the second cavity 144 provides an independent space for the marking strip 13 to pop out, so that the energy of the air in the second cavity 144 is concentrated on the cover plate 15 and the marking strip 13 when the explosive end 122 is detonated, ensuring that it pops out quickly and powerfully, forming a conspicuous reminder. Compared with a non-partitioned structure, it effectively avoids energy dispersion, ensures the height and speed requirements of the marking strip 13 popping out, and enhances the practical application effect of the device.

[0043] Furthermore, the second partition 19 includes an arc-shaped segment 191 protruding from the first cavity 143 toward the second cavity 144. The inner side of the arc-shaped segment 191 forms a clearance space 142 to avoid the induction coil 11, providing an independent installation area for the induction coil 11. This avoids direct contact between the induction coil 11 and the second partition 19 as much as possible, which helps to ensure the installation accuracy and electromagnetic induction stability of the induction coil 11. The marking strip 13 abuts against the outer surface 192 of the arc-shaped segment 191, and the arc-shaped curved surface applies pre-bending stress to it, so that the marking strip 13 remains compactly folded in the untriggered state. This saves the axial space of the second cavity 144 and effectively prevents entanglement or jamming caused by the loosening of the marking strip 13. It also ensures that the marking strip 13 can smoothly pop out along the arc trajectory when triggered, improving the release reliability and visual prompting effect.

[0044] It should be noted that the fixed end 131 of the marking tape 13 and the electronic detonator 12 are located on opposite sides of the arc-shaped section 191, which helps to reduce the direct impact on the fixed part of the marking tape 13 when the explosive end 122 is detonated, and prevents the marking tape 13 from falling off.

[0045] If the partition is planar, the airflow generated by the explosion may form a countercurrent turbulence perpendicular to the cover plate 15 within the second cavity 144, resulting in energy dispersion and reducing the effective force pushing the marker strip 13 against the cover plate 15. Therefore, in this application, the opening 141 of the receiving cavity 14 is located within the second cavity 144, and the outer surface 192 of the arc-shaped segment 191 is positioned close to the opening 141 of the receiving cavity 14. This ensures that the initial position of the marker strip 13 is close to the outlet of the receiving cavity 14, which helps to shorten the ejection stroke. Simultaneously, the curved structure of the arc-shaped segment 191 can guide the airflow generated by the explosion, causing it to flow tangentially, reducing turbulence loss and avoiding energy waste. Furthermore, the outer side of the arc-shaped segment 191, acting as a reflective surface, can create a focusing effect similar to a "trumpet mouth" when the airflow impacts, concentrating most of the explosion energy towards the direction of the cover plate 15 and the marker strip 13, thereby effectively increasing the opening speed of the cover plate 15 and the ejection force of the marker strip 13, ensuring the ejection effect of the marker strip 13.

[0046] Since this device is used as a surge arrester in a high-altitude environment, its safety requirements are high. If the cover plate 15 lacks a connecting structure, there is a risk of falling objects after the cover plate 15 is ejected. Therefore, in this application, the free end 132 of the marking strip 13 is fixedly connected to the cover plate 15, which allows the cover plate 15 to remain connected to the housing 10 after operation, preventing it from falling off and effectively preventing damage to equipment or personnel below, thus improving overall safety. In addition, during the detonation of the explosive end 122, the high-temperature and high-pressure gas first acts on the cover plate 15, causing it to open rapidly. However, the marking strip 13 is relatively less affected by the airflow and may not fully unfold. By fixing the marking strip 13 to the cover plate 15, the movement of the cover plate 15 can simultaneously push the marking strip 13 open, compensating for the insufficient force on the marking strip 13 itself and ensuring that it pops out smoothly and fully unfolds, forming a conspicuous warning.

[0047] When the device is not triggered, the identification strip 13 is housed within the second cavity 144, with its free end 132 close to the inner side of the cover plate 15. If the inner surface of the cover plate 15 is planar, the identification strip 13 may be compressed by the cover plate 15 in the folded state, leading to folding deformation, jamming, or increased release resistance, affecting the reliability of the operation. Therefore, in this application, the cover plate 15 has a groove 151 on the side facing the receiving cavity 14 to avoid the identification strip 13. This provides clearance space 142 for the identification strip 13, allowing it to maintain its natural folded shape in the untriggered state and avoiding deformation or frictional resistance due to pressure.

[0048] The through-hole 16 includes a first section 161 and a second section 162 arranged along the axis. The diameter of the first section 161 is larger than the diameter of the second section 162 to form an installation step 163 for connection with the surge arrester's rod 31. The surge arrester's rod 31 typically needs to be inserted to a certain depth into the surge arrester fault indication device 1. By designing the through-hole 16 as two sections of different diameters and forming an installation step 163 at the connection, axial restraint can be provided for the surge arrester's installation, improving its installation stability within the housing 10. The induction coil 11 surrounds the outer ring of the second section 162.

[0049] Understandably, in other embodiments, the free end of the identification strip has a weight. In the untriggered state, its own weight can be used to keep the identification strip more stably in a pre-folded state within the second cavity, avoiding loosening, displacement, or jamming caused by wind or vibration, thus improving the reliability of the device operation. At the same time, when triggered, the weight can be propelled by the explosive gas flow and quickly ejected together with the identification strip. Relying on its inertia, it enhances the stability and directionality of the identification strip's unfolding, preventing the identification strip from rolling over or deviating from its trajectory during release, thereby ensuring that it extends smoothly out of the housing and fully unfolds, forming a conspicuous reminder.

[0050] Example 2:

[0051] like Figure 4 and Figure 5 As shown, in this embodiment, a surge arrester is provided, including a pole 31 and a surge arrester fault indication device 1 of the above-mentioned technical solution installed on the pole 31. The pole 31 passes through the through hole 16 of the surge arrester fault indication device 1. The pole 31 and the induction coil 11 of the surge arrester are arranged at intervals. The surge arrester fault indication device 1 does not need to be connected to the main circuit, which fundamentally avoids interference with the normal operation of the power transmission line 5.

[0052] It should be noted that the pole 31 is also equipped with a metal oxide resistor 32. Once an overvoltage occurs, its resistance drops rapidly, allowing the current to be safely guided to the ground through the surge arrester, thereby protecting the power equipment.

[0053] The aforementioned surge arrester can be connected to the main circuit transmission line 5 via insulator 4, but the surge arrester fault indication device 1 is not connected to the main circuit.

[0054] In addition to the preferred embodiments described above, the present invention has other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.

Claims

1. A surge arrester fault indication device, characterized in that, The device includes a housing with a through hole in its central region for the rod of a surge arrester to pass through. A receiving cavity is formed within the housing, surrounding the through hole. An induction coil is arranged within the receiving cavity around the through hole. An electronic detonator and an identification strip are arranged outside the induction coil within the receiving cavity. An air gap exists between the electronic detonator and the induction coil. One end of the identification strip is fixed within the receiving cavity, while the other end is free. The housing has an opening for the identification strip to pass through the receiving cavity and a cover plate for closing the opening. When the induced current triggers the electronic detonator to detonate, the cover plate is pushed open by the high-pressure air generated by the explosion, and the identification strip is blown out from the opening.

2. The surge arrester fault indication device according to claim 1, characterized in that, The housing is provided with a first partition that separates the through hole and the receiving cavity. The first partition is an insulating partition.

3. The surge arrester fault indication device according to claim 1, characterized in that, The housing is provided with a second partition that divides the receiving cavity into a first cavity and a second cavity. The induction coil is located in the first cavity, the marking strip is located in the second cavity, and the electronic detonator includes a trigger end and an explosive end. The trigger end of the electronic detonator is located in the first cavity, and the explosive end of the electronic detonator is located in the second cavity.

4. The surge arrester fault indication device according to claim 3, characterized in that, The second partition includes an arc-shaped segment protruding from the first cavity toward the second cavity, the inner side of the arc-shaped segment forming a clearance space for the induction coil, and the marking strip abutting against the outer surface of the arc-shaped segment.

5. The surge arrester fault indication device according to claim 4, characterized in that, The opening of the receiving cavity is located in the second cavity, and the outer surface of the arc-shaped segment is positioned close to the opening of the receiving cavity.

6. The surge arrester fault indication device according to claim 1, characterized in that, The free end of the marking strip has a weight.

7. The surge arrester fault indication device according to claim 1, characterized in that, The free end of the identification strip is fixedly connected to the cover plate.

8. The surge arrester fault indication device according to claim 1, characterized in that, The cover plate has a groove for a clearance marking strip on the side facing the receiving cavity.

9. The surge arrester fault indication device according to claim 1, characterized in that, The through hole includes a first hole segment and a second hole segment arranged along the axis, wherein the diameter of the first hole segment is larger than the diameter of the second hole segment to form an installation step for connection with the surge arrester.

10. A surge arrester, characterized in that, The device includes a pole and a surge arrester fault indication device as described in any one of claims 1 to 9, mounted on the pole, wherein the pole passes through a through hole of the surge arrester fault indication device, and the pole and the induction coil are spaced apart.

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