Nonlinear lightning protection fault indicator

Abstract

A nonlinear lightning protection fault indicator disclosed by the present invention comprises a conductive plugging rod, the lower end of the conductive plugging rod is in threaded connection with a nonlinear fault indication unit, a separation device is plugged below the nonlinear fault indication unit, and a compression spring is arranged between the separation device and the nonlinear fault indication unit. The conductive plugging rod comprises an L-shaped conductive rod. According to the non-linear lightning protection fault indicator, the lower copper sheet and the separation copper pipe are arranged in a matched mode, so that the non-linear lightning protection fault indicator has the effect that explosion can be avoided when the non-linear lightning protection fault indicator has a fault; according to the non-linear lightning protection fault indicator, the non-linear lightning protection fault indicator has the effect that self faults can be easily judged, and through cooperative arrangement of the conductive plugging rod and the non-linear fault indication unit, the non-linear lightning protection fault indicator has the effect that the power supply does not need to be cut off when the non-linear lightning protection fault indicator is replaced, so that the power supply reliability can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of lightning arresters, in particular to a nonlinear lightning protection fault indicator. Background Art

[0002] A lightning protection fault indicator is a device used to detect and indicate faults in a lightning protection system. It works mainly based on the monitoring of electrical parameters such as current and voltage. When a lightning protection device (such as a lightning rod, lightning conductor, lightning arrester, etc.) is working normally, parameters such as current or voltage are within the normal range. Once a lightning protection system fails, such as aging and damage of the lightning arrester resulting in abnormal leakage current, or a broken lightning conductor blocking the grounding path, the lightning protection fault indicator can sense the changes in these electrical parameters and send out corresponding fault indication signals.

[0003] At present, if the lightning protection fault indicator of the meter box in various regions of the country fails, it cannot be disconnected in time. Long-term overvoltage during a fault will cause an explosion, which may damage the meter and cause fire and other additional losses. In addition, even if the existing lightning protection fault indicator fails, it still requires maintenance personnel to carefully check to find it, so there are safety hazards. During regular maintenance and replacement, the power supply must be cut off before operation, which reduces the reliability of power supply. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a nonlinear lightning protection fault indicator, which has the advantages of avoiding explosion when it fails itself, being able to easily identify its own fault, and not needing to cut off the power supply when replaced, thereby improving power supply reliability. It solves the problem that explosion will occur when it fails itself, it is difficult to identify its own fault, and the power supply needs to be cut off before replacement, thereby reducing power supply reliability.

[0005] (II) Technical solution In order to achieve the purpose of avoiding explosion when the above-mentioned self-failure occurs, easily judging the self-failure, and not needing to cut off the power supply when replacing, thereby improving the power supply reliability, the present invention provides the following technical solutions: a nonlinear lightning protection fault indicator, comprising a conductive plug-in rod, the lower end of the conductive plug-in rod is connected to a nonlinear fault indication unit through a thread, a detachment device is plugged under the nonlinear fault indication unit, a compression spring is arranged between the detachment device and the nonlinear fault indication unit, the conductive plug-in rod comprises an L-shaped conductive rod, the outer surface of the L-shaped conductive rod is wrapped with an insulating sleeve, and the upper end of the insulating sleeve is opened There is a quick socket, the nonlinear fault indication unit includes a nonlinear metal oxide resistor, an upper copper sheet is fixedly installed above the nonlinear metal oxide resistor, an upper stud electrode is fixedly installed above the upper copper sheet, a lower copper sheet is fixedly installed below the nonlinear metal oxide resistor, a spring seat is fixedly installed below the lower copper sheet, a detachable copper tube connected to the lower copper sheet through low-temperature soldering is arranged inside the spring seat, the outer side of the nonlinear fault indication unit is wrapped with a high creepage distance vulcanized umbrella skirt, the detachment device includes a grounding column, a plug sleeve is fixedly installed on the upper end of the grounding column, and a triangular buckle is arranged inside the plug sleeve.

[0006] Preferably, a threaded hole is provided at the lower end of the L-shaped conductive rod. Screwing the upper stud electrode into the threaded hole can realize quick connection between the nonlinear fault indication unit and the conductive plug-in rod. Similarly, screwing the upper stud electrode out of the threaded hole can realize quick disconnection between the nonlinear fault indication unit and the conductive plug-in rod.

[0007] Preferably, the insulating sleeve is integrally injection-molded on the outer surface of the L-shaped conductive rod by means of an insert injection molding process, the inner diameter of the lower end of the insulating sleeve is larger than the outer diameter of the upper end step of the high creepage distance vulcanized umbrella skirt, and when the nonlinear fault indication unit is screwed upward into the lower end of the conductive plug-in rod, the lower end of the insulating sleeve covers the upper end of the high creepage distance vulcanized umbrella skirt, thereby protecting the threaded connection part inside the enclosed space.

[0008] Preferably, the outer diameter of the upper copper sheet and the outer diameter of the lower copper sheet are the same as the outer diameter of the nonlinear metal oxide resistor, and the upper copper sheet and the lower copper sheet are bonded to the nonlinear metal oxide resistor by conductive adhesive.

[0009] Preferably, the upper stud electrode is concentric with the nonlinear metal oxide resistor and fixedly connected to the upper copper sheet by welding, the spring seat is concentric with the nonlinear metal oxide resistor and fixedly connected to the lower copper sheet by welding, the detached copper tube is concentric with the spring seat and connected to the lower copper sheet by low-temperature tin, and when the temperature rises, the low-temperature tin melts again to disconnect the detached copper tube from the lower copper sheet.

[0010] Preferably, the high creepage distance vulcanized shed wraps the nonlinear metal oxide resistor, the lower end of the upper stud electrode and the upper end of the spring seat inside, and the high creepage distance vulcanized shed can effectively prevent current leakage to the surrounding environment while also protecting the welding points of the three.

[0011] Preferably, the upper end surface of the grounding column is higher than the upper end surface of the plug-in sleeve, and the lower end surface of the detachment copper tube is lower than the lower end surface of the spring seat, so that when the detachment device is inserted upward into the nonlinear fault indication unit, the grounding column is first inserted into the detachment copper tube for a distance before the plug-in sleeve is inserted into the spring seat.

[0012] Preferably, a circular buckle is provided at the bottom of the detachment copper tube. When the detachment device is inserted upward into the nonlinear fault indication unit a certain distance, the triangular buckle passes over the circular buckle through the upper inclined surface, and then the triangular buckle is engaged with the circular buckle through the lower plane to connect the detachment device to the bottom of the nonlinear fault indication unit.

[0013] Preferably, the compression spring is inserted in the annular cavity between the plug sleeve and the detachable copper tube. When the compression spring is compressed, it gives a downward thrust to the detachment device. When the low-temperature solder between the detachment copper tube and the lower copper sheet melts at high temperature, the compression spring can pop the detachment device downward through elastic force.

[0014] Compared with the prior art, the present invention provides a nonlinear lightning protection fault indicator, which has the following beneficial effects: 1. The nonlinear lightning protection fault indicator can avoid explosion when it fails by coordinating the lower copper sheet and the detached copper tube. Since the lower copper sheet and the detached copper tube are soldered by low-temperature tin, they will automatically disconnect due to temperature rise under long-term overvoltage conditions, thereby avoiding explosion due to excessive temperature.

[0015] 2. The nonlinear lightning protection fault indicator, through the coordinated arrangement of the nonlinear fault indication unit, the disengagement device and the compression spring, enables the nonlinear lightning protection fault indicator to easily judge when it fails itself. When it fails itself and there is a long-term overcurrent, the disengagement copper tube at the lower end of the nonlinear fault indication unit for clamping the disengagement device will automatically disconnect, and then the compression spring will push the disengagement device out from the lower end of the nonlinear fault indication unit. At this time, the lightning protection fault indicator is divided into two, and it can be clearly judged that it has a fault.

[0016] 3. The nonlinear lightning protection fault indicator, through the coordinated arrangement of the conductive plug-in rod and the nonlinear fault indication unit, enables the nonlinear lightning protection fault indicator to have the effect of not needing to cut off the power supply when replacing, thereby improving the power supply reliability. Since the outer sides of the conductive plug-in rod and the nonlinear fault indication unit are both wrapped with insulating materials and the two are connected by threads for easy disassembly, even if the conductive plug-in rod is still inserted in the meter box, the two can be directly connected or disassembled. At the same time, because the surface of the conductive plug-in rod has an insulating sleeve and is connected to the meter box by a quick socket for plugging, it can also be directly plugged in when the L-shaped conductive rod is energized, achieving the effect of not needing to cut off the power supply when replacing, thereby improving the power supply reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure proposed by the present invention; Figure 2 This is a schematic diagram of the structure of the conductive plug rod proposed by the present invention; Figure 3 This is a schematic diagram of the structure of the nonlinear fault indication unit proposed by the present invention; Figure 4 This is a schematic structural diagram of the disengagement device proposed in the present invention.

[0018] In the figure: 1. Conductive plug rod; 101. L-shaped conductive rod; 102. Insulating sleeve; 103. Quick socket; 2. Non-linear fault indication unit; 201. Non-linear metal oxide resistor; 202. Upper copper sheet; 203. Upper stud electrode; 204. Lower copper sheet; 205. Spring seat; 206. Disengagement copper tube; 2061. Round buckle; 207. High creepage distance vulcanized umbrella skirt; 3. Disengagement device; 301. Grounding column; 302. Plug sleeve; 303. Triangular buckle; 4. Compression spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-4The nonlinear lightning protection fault indicator comprises a conductive plug-in rod 1, which is a component for connecting the indicator to the electric meter box. The upper end of the conductive plug-in rod 1 is inserted into the electric meter box. The lower end of the conductive plug-in rod 1 is connected to a nonlinear fault indication unit 2 through a thread. The nonlinear fault indication unit 2 is used to limit the damage of overvoltage to the equipment. A disengagement device 3 is plugged under the nonlinear fault indication unit 2. The disengagement device 3 can be disengaged in time when the nonlinear fault indication unit 2 is subjected to overvoltage, thereby avoiding the occurrence of open fire. By disengaging the disengagement device 3, it can be clearly identified whether the lightning protection fault indicator is faulty. A compression spring 4 is arranged between the disengagement device 3 and the nonlinear fault indication unit 2. The conductive plug-in rod 1 comprises an L-shaped conductive rod 10 made of alloy aluminum. 1. The outer surface of the L-shaped conductive rod 101 is wrapped with an insulating sleeve 102. The upper end of the insulating sleeve 102 is provided with a quick socket 103. The quick socket 103 is used to be connected with the connection hole of the meter box. The nonlinear fault indication unit 2 includes a nonlinear metal oxide resistor 201. Under normal operating voltage, the nonlinear metal oxide resistor 201 presents a high resistance state, and the current passing through is extremely small, generally in the microampere level. At this time, it is equivalent to an insulator. When an overvoltage occurs in the system, such as a lightning overvoltage or an operating overvoltage, the voltage acting on the nonlinear metal oxide resistor 201 increases, and the valence electrons in the grain boundary layer of the metal oxide additive are pulled out, or electron avalanche is generated due to collision ionization, so that the carriers increase greatly, and the electric The resistance is rapidly reduced, so that a large current can be passed to absorb and discharge the energy generated by the overvoltage, which can protect the electric meter. An upper copper sheet 202 is fixedly installed above the nonlinear metal oxide resistor 201, and an upper stud electrode 203 is fixedly installed above the upper copper sheet 202. A lower copper sheet 204 is fixedly installed below the nonlinear metal oxide resistor 201. The copper sheet effectively connects the nonlinear metal oxide resistor 201 to the circuit over a large area. A spring seat 205 is fixedly installed below the lower copper sheet 204. A detachable copper tube 206 connected to the lower copper sheet 204 through low-temperature solder is arranged inside the spring seat 205. The outer side of the nonlinear fault indication unit 2 is wrapped with a high creepage distance vulcanized shed 207. A threaded hole is provided at the lower end of the L-shaped conductive rod 101. The upper stud electrode 203 is screwed into the threaded hole to realize the quick connection between the nonlinear fault indication unit 2 and the conductive plug-in rod 1. Similarly, the upper stud electrode 203 is screwed out of the threaded hole to realize the quick separation between the nonlinear fault indication unit 2 and the conductive plug-in rod 1. The insulating sleeve 102 is integrally injection-molded on the outer surface of the L-shaped conductive rod 101 by means of insert injection molding. The inner diameter of the lower end of the insulating sleeve 102 is larger than the outer diameter of the step at the upper end of the high creepage distance vulcanized shed 207. When the nonlinear fault indication unit 2 is screwed upward into the lower end of the conductive plug-in rod 1, the lower end of the insulating sleeve 102 covers the upper end of the high creepage distance vulcanized shed 207, so that the threaded connection part can be protected inside the closed space.The outer diameter of the upper copper sheet 202 and the outer diameter of the lower copper sheet 204 are both the same as the outer diameter of the nonlinear metal oxide resistor 201. The upper copper sheet 202 and the lower copper sheet 204 are bonded to the nonlinear metal oxide resistor 201 by conductive adhesive. The upper stud electrode 203 is concentric with the nonlinear metal oxide resistor 201 and is fixedly connected to the upper copper sheet 202 by welding. The spring seat 205 is concentric with the nonlinear metal oxide resistor 201 and is fixedly connected to the lower copper sheet 204 by welding. The copper tube 206 is separated. The detachment device 3 is concentric with the spring seat 205 and connected to the lower copper sheet 204 through low-temperature tin. When the temperature rises, the low-temperature tin melts again to disconnect the connection between the detachment copper tube 206 and the lower copper sheet 204. The high creepage distance vulcanized shed 207 wraps the nonlinear metal oxide resistor 201, the lower end of the upper stud electrode 203 and the upper end of the spring seat 205 inside. The high creepage distance vulcanized shed 207 can effectively prevent the current from leaking to the surrounding environment while protecting the welding points of the three. The detachment device 3 includes a grounding column 301, and the upper end of the grounding column 301 is fixedly installed There is a plug sleeve 302, and a triangular buckle 303 is arranged inside the plug sleeve 302. The upper end surface of the grounding column 301 is higher than the upper end surface of the plug sleeve 302, and the lower end surface of the detaching copper tube 206 is lower than the lower end surface of the spring seat 205, so that when the detaching device 3 is inserted upward into the nonlinear fault indication unit 2, the grounding column 301 is first inserted into the detaching copper tube 206 for a distance, and then the plug sleeve 302 is inserted into the spring seat 205. A circular buckle 2061 is arranged below the detaching copper tube 206. When the detaching device 3 is inserted upward into the nonlinear fault indication unit 2 for a certain distance, the grounding column 301 is inserted into the detaching copper tube 206 for a distance, and then the plug sleeve 302 is inserted into the spring seat 205. After the release, the triangular buckle 303 passes over the circular buckle 2061 through the upper inclined surface, and then the triangular buckle 303 is engaged with the circular buckle 2061 through the lower plane to connect the release device 3 to the bottom of the nonlinear fault indication unit 2. The compression spring 4 is inserted into the annular cavity between the plug sleeve 302 and the release copper tube 206. When the compression spring 4 is compressed, it gives a downward thrust to the release device 3. When the low-temperature solder between the release copper tube 206 and the lower copper sheet 204 melts at high temperature, the compression spring 4 can eject the release device 3 downward through elastic force.

[0021] When in use, the conductive plug rod 1 is made of alloy aluminum with good conductor effect. The processed conductive plug rod 1 is placed in an injection mold and an insulating sleeve 102 with a thickness of 3 mm is integrally molded on the outer surface through an insert injection molding process. The material of the injection molded insulating sleeve 102 is PA66 plastic. PA66 plastic has high strength, wear resistance and high melting point, so that the conductive plug rod 1 can withstand multiple plugging and unplugging and high temperature resistance. The quick socket 103 adopts a groove design, and the groove needs to expose the internal conductive plug rod 1, so that the quick socket 103 plays a role of both clamping and To achieve the function of conducting electricity, the lower copper sheet 204 and the detaching copper tube 206 are connected by low-temperature solder, and the melting temperature of the low-temperature solder is between 130°C and 150°C. If the nonlinear metal oxide resistor 201 fails, a large amount of heat will be generated when the current passes through and the temperature will rise sharply. When the temperature reaches the melting temperature of the low-temperature solder, the detaching copper tube 206 will separate from the lower copper sheet 204. When the detaching device 3 is inserted into the nonlinear fault indication unit 2, the compression spring 4 will be compressed and an elastic force will be generated. At this time, the elastic force gives the detaching device 3 an energy to push outward. Under normal circumstances, the disengagement device 3 is connected to the circular buckle 2061 below the disengagement copper tube 206 by the triangular buckle 303 and cannot be disengaged. However, if the nonlinear metal oxide resistor 201 fails and the temperature reaches the melting value of the low-temperature solder, the disengagement copper tube 206 is separated from the lower copper sheet 204, and the energy of the spring compression is released to push the disengagement device 3 together with the disengagement copper tube 206 outward, so that the nonlinear metal oxide resistor 201 no longer forms a closed-loop circuit and therefore no longer generates heat, thereby avoiding the explosion of the nonlinear metal oxide resistor 201. After the disengagement device 3 is separated from the nonlinear fault indication unit 2, an obvious visual effect is formed, so that the maintenance personnel can see the fault at a glance. When replacing the broken nonlinear fault indication unit 2, since the outer surfaces of the conductive plug-in rod 1 and the nonlinear fault indication unit 2 are both wrapped with an insulating layer and all the connection structures are not complicated, they can be directly operated when the inside is energized, and the meter box does not need to be powered off. The high creepage distance vulcanized shed 207 can also reduce the flashover phenomenon of the nonlinear lightning protection fault indicator caused by humid weather.

[0022] In summary, since the lower copper sheet 204 and the detaching copper tube 206 are soldered by low-temperature tin, the nonlinear lightning protection fault indicator will automatically disconnect due to the increase in temperature under a long-term overvoltage state, thereby avoiding explosion due to excessive temperature. When a fault occurs and a long-term overcurrent passes through, the detaching copper tube 206 at the lower end of the nonlinear fault indication unit 2 for clamping the detaching device 3 will automatically disconnect, and then the compression spring 4 will push the detaching device 3 out of the lower end of the nonlinear fault indication unit 2. At this time, the lightning protection fault indicator is divided into two, and it can be clearly judged that a fault has occurred. Since the outer sides of the conductive plug-in rod 1 and the nonlinear fault indication unit 2 are wrapped with insulating materials and the two are connected by threads for easy disassembly, even if the conductive plug-in rod 1 is still inserted in the meter box, the two can be directly connected or disassembled. At the same time, because the surface of the conductive plug-in rod 1 has an insulating sleeve 102 and is plug-in connected to the meter box through a quick socket 103, it can also be directly plugged in when the L-shaped conductive rod 101 is energized, so that the power supply does not need to be cut off during replacement, thereby improving the power supply reliability.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nonlinear lightning protection fault indicator, comprising a conductive plug-in rod (1), characterized in that: The lower end of the conductive plug-in rod (1) is connected to a nonlinear fault indication unit (2) via a thread, a disengagement device (3) is plugged into the lower part of the nonlinear fault indication unit (2), a compression spring (4) is arranged between the disengagement device (3) and the nonlinear fault indication unit (2), the conductive plug-in rod (1) comprises an L-shaped conductive rod (101), the outer surface of the L-shaped conductive rod (101) is wrapped with an insulating sleeve (102), the upper end of the insulating sleeve (102) is provided with a quick-access socket (103), the nonlinear fault indication unit (2) comprises a nonlinear metal oxide resistor (201), an upper copper sheet (202) is fixedly mounted above the nonlinear metal oxide resistor (201) An upper stud electrode (203) is fixedly mounted above the upper copper sheet (202), a lower copper sheet (204) is fixedly mounted below the nonlinear metal oxide resistor (201), a spring seat (205) is fixedly mounted below the lower copper sheet (204), a detachable copper tube (206) connected to the lower copper sheet (204) via low-temperature solder is arranged inside the spring seat (205), a high creepage distance vulcanized shed (207) is wrapped around the outside of the nonlinear fault indication unit (2), and the detachable device (3) comprises a grounding column (301), a plug sleeve (302) is fixedly mounted on the upper end of the grounding column (301), and a triangular buckle (303) is arranged inside the plug sleeve (302).

2. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: A threaded hole is provided at the lower end of the L-shaped conductive rod (101); screwing the upper stud electrode (203) into the threaded hole enables the nonlinear fault indication unit (2) to be quickly connected to the conductive plug-in rod (1); similarly, screwing the upper stud electrode (203) out of the threaded hole enables the nonlinear fault indication unit (2) to be quickly disconnected from the conductive plug-in rod (1).

3. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: The insulating sleeve (102) is integrally injection molded on the outer surface of the L-shaped conductive rod (101) by means of an insert injection molding process. The inner diameter of the lower end of the insulating sleeve (102) is larger than the outer diameter of the upper step of the high creepage distance vulcanized shed (207). When the nonlinear fault indication unit (2) is screwed upward into the lower end of the conductive plug-in rod (1), the lower end of the insulating sleeve (102) covers the upper end of the high creepage distance vulcanized shed (207), thereby protecting the threaded connection part in a closed space.

4. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: The outer diameter of the upper copper sheet (202) and the outer diameter of the lower copper sheet (204) are both the same as the outer diameter of the nonlinear metal oxide resistor (201), and the upper copper sheet (202) and the lower copper sheet (204) are bonded to the nonlinear metal oxide resistor (201) by conductive adhesive.

5. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: The upper stud electrode (203) is concentric with the nonlinear metal oxide resistor (201) and is fixedly connected to the upper copper sheet (202) by welding; the spring seat (205) is concentric with the nonlinear metal oxide resistor (201) and is fixedly connected to the lower copper sheet (204) by welding; the detachable copper tube (206) is concentric with the spring seat (205) and is connected to the lower copper sheet (204) by low-temperature tin; when the temperature rises, the low-temperature tin re-melts to disconnect the detachable copper tube (206) from the lower copper sheet (204).

6. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: The high creepage distance vulcanized shed (207) wraps the nonlinear metal oxide resistor (201), the lower end of the upper stud electrode (203) and the upper end of the spring seat (205) inside. The high creepage distance vulcanized shed (207) can effectively prevent current from leaking to the surrounding environment while also protecting the welding points of the three.

7. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: The upper end surface of the grounding column (301) is higher than the upper end surface of the plug sleeve (302), and the lower end surface of the detached copper tube (206) is lower than the lower end surface of the spring seat (205), so that when the detaching device (3) is inserted upward into the nonlinear fault indication unit (2), the grounding column (301) is first inserted into the detached copper tube (206) for a distance before the plug sleeve (302) is inserted into the spring seat (205).

8. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: A circular buckle (2061) is provided below the detachment copper tube (206); when the detachment device (3) is inserted upwards into the nonlinear fault indication unit (2) for a certain distance, the triangular buckle (303) passes over the circular buckle (2061) via the upper inclined surface; then, the triangular buckle (303) is engaged with the circular buckle (2061) via the lower flat surface, so that the detachment device (3) is connected below the nonlinear fault indication unit (2).

9. The nonlinear lightning protection fault indicator according to claim 1, characterized in that: The compression spring (4) is inserted into the annular cavity between the plug sleeve (302) and the detachable copper tube (206). When the compression spring (4) is compressed, it gives the detachable device (3) a downward thrust. When the low-temperature solder between the detachable copper tube (206) and the lower copper sheet (204) melts at high temperature, the compression spring (4) can eject the detachable device (3) downward through elastic force.

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