A special device for protecting lightning arrester

Abstract

The present application relates to the technical field of lightning arresters, and discloses a special device for protecting lightning arresters, which includes a shell, wherein a housing cavity is arranged in the shell, the shell includes a shell, a first cover module located on one side of the shell, and a second cover module located on the side of the shell away from the first cover module, a conductive module for electrically connecting a first terminal block and a second terminal block is arranged in the housing cavity; the conductive module includes a fuse electrically connected to the second cover module and a pulling structure for electrically connecting the first cover module to the fuse, the pulling structure can apply a force to the fuse away from the second cover module, and the present application has the effect of reducing the probability of accidents caused by lightning arrester failures.

Description

Technical Field

[0001] The present application relates to the technical field of lightning arresters, and in particular to a special device for protecting lightning arresters. Background Art

[0002] As a pulse overvoltage protection device, the arrester is connected in parallel to the power system. The arrester is in a high resistance state and only microampere current passes through it.

[0003] When a lightning arrester fails and its performance degrades, the leakage current of the lightning arrester increases, causing the heat generation to rise sharply, leading to thermal collapse and even accidents. Summary of the invention

[0004] In order to reduce the probability of accidents caused by lightning arrester failure, the present application provides a special device for protecting the lightning arrester.

[0005] The present application provides a special device for protecting a lightning arrester, which adopts the following technical solution:

[0006] A special device for protecting a lightning arrester comprises a shell, wherein a housing is provided in the shell, wherein the shell comprises a shell, a first cover module located on one side of the shell, and a second cover module located on a side of the shell away from the first cover module, wherein a conductive module for electrically connecting a first terminal block and a second terminal block is provided in the housing cavity; the conductive module comprises a fuse electrically connected to the second cover module and a material pulling structure for electrically connecting the first cover module and the fuse, wherein the material pulling structure can exert a force on the fuse in a direction away from the second cover module.

[0007] By adopting the above technical scheme, the special equipment for protecting the lightning arrester is connected in series to the power system with the lightning arrester. When the lightning arrester fails, the voltage at this time is the system voltage. Since the current flowing through the lightning arrester increases, the fault current passing through the first cover module, the material pulling structure, the fuse core, and the second cover module increases, so that the temperature of the fuse core rises and melts, so that the lightning arrester is no longer energized. In the event of a lightning arrester failure, it is isolated from the high-voltage power grid, reducing the probability of accidents caused by the lightning arrester failure; when the fuse core melts, the material pulling structure can drive the two fused cores away from each other, increase the arc distance between the two fused cores, extinguish the arc, and play a role in electrically isolating the faulty lightning arrester.

[0008] Optionally, the material pulling structure includes a positioning block and a movable block arranged in the accommodating cavity, the side of the fusible core away from the second cover body module passes through the positioning block and is formed with a hook portion, the movable block is located on the side of the positioning block away from the second cover body module, a gap is left between the movable block and the positioning block, an elastic member for driving the movable block to move in a direction away from the first positioning block is arranged in the gap, and a pull ring mounted outside the hook portion is arranged on the side of the movable block facing the positioning block.

[0009] By adopting the above technical solution, the elastic member applies a force to the movable block, causing the movable block and the pull ring to move in a direction away from the fuse core. When the fuse core melts due to the increase in the leakage current of the lightning arrester, the pull ring can drive the melted fuse core to move, thereby increasing the arc distance between the two sections of the fuse core, extinguishing the arc and electrically isolating the faulty lightning arrester.

[0010] Optionally, a connecting bar connecting the movable block and the positioning block is provided between the movable block and the positioning block, and the connecting bar is used to limit the increase of the gap between the movable block and the positioning block.

[0011] By adopting the above technical solution, when the connecting strip connects the movable block and the positioning block, the force exerted by the connecting strip on the movable block / positioning block is offset by the elastic force of the elastic member, and when there is no need to pull the fusible core, the pulling force on the fusible core is reduced, making the fusible core less likely to be damaged; anyway, when it is necessary to pull the fusible core, the connecting strip is disconnected, and the elastic member can exert force on the movable block, so that the movable block drives the fusible core to move through the pull ring.

[0012] Optionally, the elastic member adopts a conductive spring, one end of the conductive spring abuts against the movable block, and the other end of the conductive spring abuts against the positioning block, the connecting strip includes an insulating part and a metal part connected to the insulating part, the metal part is made of a low melting point metal, one end of the insulating part is connected to the movable block, and the other end of the metal part is connected to the positioning block, or one end of the insulating part is connected to the movable block, and the other end of the metal part is connected to the positioning block.

[0013] By adopting the above technical solution, this product is connected in series with the lightning arrester in the power system. The leakage current of the lightning arrester increases when it fails. When the large fault current passes through the conductive spring, the low-melting-point metal of the middle dual-material tensioning wire is heated under the eddy current effect, causing the low-melting-point metal to melt, so that the connecting bar no longer applies tension to the movable block and the positioning block.

[0014] Optionally, both the positioning block and the movable block use discharge electrodes.

[0015] By adopting the above technical solution, this product is connected in series with the lightning arrester in the power system. When the lightning arrester is in normal overvoltage protection, the voltage breaks down the positioning block and the movable block, and the current passes through the first cover module, the movable block, the positioning block, the fuse, the second cover module, and the lightning arrester connected to this product in sequence, and finally passes to the earth; the breakdown of the positioning block and the movable block avoids the inductance of the conductive spring, reduces the voltage on this product, and avoids reducing the protection effect of the lightning arrester.

[0016] Optionally, the first cover module includes a first mounting cover, a first accommodating groove into which the shell can be inserted is formed at one end of the first mounting cover, a through hole is formed on the inner wall of the side of the first accommodating groove, and a first wiring board is passed through the through hole.

[0017] Optionally, a first fastener connecting the bottom wall of the first accommodating groove and the first wiring board is provided between the two.

[0018] By adopting the above technical solution, the first terminal block and the first mounting cover can be quickly connected with the help of the first fastener, so that the two are not easily separated; conversely, the connection between the first terminal block and the first mounting cover can be released, which is convenient for replacing the damaged first terminal block.

[0019] Optionally, the first fastener is a first bolt, the movable block / conductive spring is connected with a lead, and the lead is pressed by the cooperation between the head of the first bolt and the first wiring board.

[0020] By adopting the above technical solution, the lead wire can be tightened by the cooperation of the first bolt and the first terminal plate, and the staff does not need to weld the lead wire to the first bolt separately, thereby reducing the production steps of this product and improving the production efficiency of this product.

[0021] Optionally, the movable block is provided with an indicator away from the second cover module, and the first mounting cover is provided with a socket for the indicator to pass through.

[0022] By adopting the above technical solution, when the indicator is extended out of the first cover body, the staff can observe from outside the protection device, thereby quickly knowing that the lightning arrester electrically connected to the protection device is damaged, so that the staff can replace and repair the lightning arrester as soon as possible.

[0023] Optionally, the shell is filled with quartz sand.

[0024] By adopting the above technical solution, quartz sand can improve the arc extinguishing effect of the protection equipment and increase the service life of the protection equipment.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] 1. Connect the special equipment for lightning arrester protection in series to the power system with lightning arrester. When the lightning arrester fails, the voltage is the system voltage. As the current flowing through the lightning arrester increases, the fault current passing through the first cover module, the material pulling structure, the fuse core, and the second cover module increases, causing the temperature of the fuse core to rise and fuse, so that the lightning arrester is no longer energized. In the event of a lightning arrester failure, it is isolated from the high-voltage power grid, reducing the probability of accidents caused by lightning arrester failure; when the fuse core melts, the material pulling structure can drive the two blown fuse cores away from each other, increase the arc distance between the two blown fuse cores, extinguish the arc, and play a role in electrically isolating the faulty lightning arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0029] Figure 2 is along Figure 1 Sectional view along line AA;

[0030] Figure 3 yes Figure 2 Schematic diagram of the enlarged portion B.

[0031] Figure numerals: 1. shell; 11. shell; 111. storage hole; 112. quartz sand; 12. first cover module; 121. first mounting cover; 1211. first receiving groove; 1212. through hole; 122. first terminal block; 123. first fastener; 13. second cover module; 131. second mounting cover; 1311. second receiving groove; 132. second terminal block; 133. second fastener; 14. jacket; 2. conductive module; 21. fuse; 211. hook; 22. material pulling structure; 221. positioning block; 222. movable block; 223. elastic member; 224. pull ring; 225. connecting strip; 226. indicator; 227. lead. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-3 This application is described in further detail.

[0033] This embodiment discloses a special device for protecting a lightning arrester. Figure 1 and Figure 2 A special device for protecting a lightning arrester comprises a housing 1, wherein the housing 1 comprises a shell 11, a first cover module 12, a second cover module 13 and a jacket 14. A storage hole 111 is provided on the end surface of the shell 11.

[0034] Reference Figure 1 and Figure 2 The first cover module 12 is located on one side of the housing 11 along the axis direction of the storage hole 111. The first cover module 12 includes a first mounting cover 121 and a first wiring board 122. The first mounting cover 121 is made of insulating material. The first mounting cover 121 is provided with a first receiving groove 1211, the first receiving groove 1211 can be inserted into the housing 11, and the first receiving groove 1211 is connected to the storage hole 111.

[0035] Reference Figure 1 and Figure 2 A through hole 1212 is provided on the side inner wall of the first mounting cover 121. The first wiring board 122 passes through the through hole 1212 and is inserted into the first receiving groove 1211. The first wiring board 122 is made of a conductive material. A first fastener 123 is provided between the first wiring board 122 and the bottom wall of the first receiving groove 1211 to connect the two. The first fastener 123 is a first bolt. The first bolt passes through the first wiring board 122 and is threadedly connected to the bottom wall of the first receiving groove 1211.

[0036] Reference Figure 1 and Figure 2 The second cover module 13 is disposed on a side of the housing 11 away from the first cover module 12. The second cover module 13 includes a second mounting cover 131 and a second wiring board 132. The second mounting cover 131 is provided with a second receiving groove 1311, the second receiving groove 1311 can be inserted into the housing 11, and the second receiving groove 1311 is connected to the storage hole 111. The first receiving groove 1211, the storage hole 111 and the second receiving groove 1311 form a receiving cavity.

[0037] Reference Figure 1 and Figure 2 A second wiring board 132 is provided on a side of the second mounting cover 131 away from the first mounting cover 121, and the second wiring board 132 is made of a conductive material. A second fastener 133 connecting the second wiring board 132 and the end surface of the second mounting cover 131 away from the first mounting cover 121 is provided. The second fastener 133 is a second bolt. The second bolt passes through the second wiring board 132 and is threadedly connected to the second mounting cover 131.

[0038] Reference Figure 1 and Figure 2 In other embodiments, the second cover module 13 adopts the same structure as the first cover module 12.

[0039] Reference Figure 1 The outer jacket 14 is made of insulating material, and the outer jacket 14 can be made of silicone rubber, ceramics, etc. The outer jacket 14 is sleeved outside the housing 11 and the second mounting cover 131. In other embodiments, the outer jacket 14 is only sleeved outside the housing 11.

[0040] Reference Figure 2 A conductive module 2 is disposed in the accommodating cavity, and the conductive module 2 is used to electrically connect the first wiring board 122 and the second wiring board 132. The fuse module includes a fuse core 21 and a material pulling structure 22.

[0041] Reference Figure 2 and Figure 3One end of the fuse core 21 passes through the second mounting cover 131 and is electrically connected to the second wiring board 132. The pulling structure 22 is used to electrically connect the first wiring board 122 and the fuse core 21.

[0042] Reference Figure 2 and Figure 3 The pull spring electrically connects the fuse 21 to the first terminal block 122, and the pull structure 22 is disposed in the first receiving groove 1211. In other embodiments, a portion of the pull structure 22 is disposed in the first receiving groove 1211, and another portion of the conductive structure is disposed in the storage hole 111; or the conductive structure is completely disposed in the storage hole 111.

[0043] Reference Figure 2 and Figure 3 The material pulling structure 22 includes a positioning block 221, a movable block 222, an elastic member 223, a pull ring 224 and a connecting strip 225. The end surface of the positioning block 221 away from the bottom wall of the first accommodating groove 1211 abuts against the housing 11, and the positioning block 221 adopts a discharge electrode.

[0044] Reference Figure 2 and Figure 3 The movable block 222 adopts a discharge electrode. The movable block 222 is slidably disposed in the first receiving groove 1211, and the movable block 222 is located on a side of the positioning block 221 away from the second installation cover 131. A gap is left between the movable block 222 and the positioning block 221.

[0045] Reference Figure 2 and Figure 3 The end surface of the movable block 222 facing the bottom wall of the first receiving groove 1211 is fixedly connected with an indicator 226, and the indicator 226 passes through the first wiring board 122 and the first installation cover 121 and can extend out of the first installation cover 121. The first installation cover 121 is provided with a plug hole, and the plug hole can be passed through by the indicator 226. The end surface of the movable block 222 away from the bottom wall of the first receiving groove 1211 is fixedly connected with a pull ring 224.

[0046] Reference Figure 2 The elastic member 223 is disposed between the fixed block and the movable block 222, and is used to apply a force to the movable block 222 to move away from the positioning block 221. The elastic member 223 includes a conductive spring, one end of which abuts against the positioning block 221, and the other end of which abuts against the movable block 222.

[0047] Reference Figure 3 The connecting bar 225 is disposed between the fixed block and the movable block 222 , and the connecting bar 225 is used to limit the increase of the gap between the positioning block 221 and the movable block 222 .

[0048] Reference Figure 3The connecting bar 225 includes an insulating part and a metal part, the insulating part is connected to the metal part, and the metal part is made of a low melting point metal. The insulating part is connected to the movable block 222, and the metal part is connected to the positioning block 221. In other embodiments, the metal part is connected to the movable block 222, and the insulating part is connected to the positioning block 221; or both ends of the metal part are connected to an insulating part, one insulating part is connected to the positioning block 221, and the other insulating part is connected to the movable block 222.

[0049] Reference Figure 3 , the movable block 222 is electrically or electrically connected to the conductive spring with a lead 227. The other end of the lead 227 is connected to the first bolt by welding, crimping, etc. At this time, the first bolt is made of a conductive material, as long as the lead 227 is electrically connected to the first wiring board 122. In other embodiments, the other end of the lead 227 is pressed against the first wiring board 122 through the head of the bolt; or the other end of the lead 227 is connected to the first wiring board 122 by welding, crimping, plugging, etc.

[0050] Reference Figure 3 The side of the fuse core 21 away from the second mounting cover 131 passes through the positioning block 221 and is formed with a hook portion 211. The hook portion 211 can pass through the pull ring 224. One end of the hook portion 211 away from the second wiring board 132 is connected to the conductive spring. The hook portion 211 abuts against the positioning block 221.

[0051] Reference Figure 2 The storage hole 111 is filled with quartz sand 112, and the quartz sand 112 can improve the arc extinguishing effect.

[0052] The implementation principle of a special device for protecting a lightning arrester in an embodiment of the present application is: the special device for protecting a lightning arrester is connected in series to a power system with a lightning arrester. When the lightning arrester is normal and not triggered, the current passes through the first terminal block 122, the lead 227, the first fastener 123, the conductive spring, the fuse 21, the second terminal block 132 and the lightning arrester.

[0053] When the arrester is normal and triggered, the current passes through the first terminal block 122, the first fastener 123, the lead 227, the movable block 222, the positioning block 221, the fuse 21, the second terminal block 132 and the arrester, and finally reaches the ground.

[0054] When the arrester fails, the current flowing through the arrester increases. At this time, the voltage is the system voltage, and the movable block 222 and the positioning block 221 cannot be broken down. The fault current passes through the first terminal block 122, the lead 227, the first fastener 123, the conductive spring, the fuse 21, the second terminal block 132 and the arrester, and then connects to the ground. In the above process, when a large fault current flows through the conductive spring, the conductive spring heats the metal part of the connecting strip 225 under the eddy current effect of the conductive spring, causing the metal part to melt, and under the tensile force of the conductive spring, drives the movable block 222 and the indicator 226 to move toward the bottom wall of the first accommodating groove 1211, so that the indicator 226 extends out of the first mounting cover 121, serving as a prompt and indicating an action; at this time, the fuse 21 will also melt, and during the movement of the movable block 222 toward the bottom wall of the first accommodating groove 1211, the movable block 222 drives the fused fuse 21 to move through the pull ring 224, thereby increasing the arc distance between the two fused fuses 21 and extinguishing the arc, thereby achieving electrical isolation of the fault arrester.

[0055] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present application should be included in the protection scope of the present application.

Claims

1. A special device for protecting a lightning arrester, characterized in that: The invention comprises a shell (1), wherein a receiving cavity is arranged in the shell (1), wherein the shell (1) comprises a shell (11), a first cover module (12) located at one side of the shell (11), and a second cover module (13) located at a side of the shell (11) away from the first cover module (12), wherein a conductive module (2) for electrically connecting a first wiring board (122) and a second wiring board (132) is arranged in the receiving cavity; the conductive module (2) comprises a fuse (21) electrically connected to the second cover module (13) and a pulling structure (22) for electrically connecting the first cover module (12) and the fuse (21), wherein the pulling structure (22) can exert a force on the fuse (21) away from the second cover module (13); The material pulling structure (22) comprises a positioning block (221) and a movable block (222) arranged in the accommodating cavity; the side of the fusible core (21) away from the second cover module (13) passes through the positioning block (221) and is formed with a hook portion (211); the movable block (222) is located on the side of the second cover module (13) of the positioning block (221); a gap is left between the movable block (222) and the positioning block (221); an elastic member (223) is arranged in the gap for driving the movable block (222) to move in a direction away from the positioning block (221); and a pull ring (224) sleeved on the outside of the hook portion (211) is arranged on the side of the movable block (222) facing the positioning block (221); A connecting bar (225) is provided between the movable block (222) and the positioning block (221) to connect the two, and the connecting bar (225) is used to limit the increase of the gap between the movable block (222) and the positioning block (221); The elastic member (223) is a conductive spring, one end of which is in contact with the movable block (222), and the other end of which is in contact with the positioning block (221). The connecting strip (225) comprises an insulating portion and a metal portion connected to the insulating portion, the metal portion being made of a low melting point metal, one end of the insulating portion being connected to the movable block (222), and the other end of the metal portion being connected to the positioning block (221), or one end of the insulating portion being connected to the movable block (222), and the other end of the metal portion being connected to the positioning block (221).

2. The special device for protecting a lightning arrester according to claim 1, characterized in that: The positioning block (221) and the movable block (222) both use discharge electrodes.

3. The special device for protecting a lightning arrester according to claim 1, characterized in that: The first cover module (12) comprises a first mounting cover (121), one end of the first mounting cover (121) is provided with a first receiving groove (1211) into which the housing (11) can be inserted, a through hole (1212) is provided on the inner wall of the side of the first receiving groove (1211), and a first wiring board (122) is inserted into the through hole (1212).

4. The special device for protecting a lightning arrester according to claim 3, characterized in that: A first fastener (123) is provided between the bottom wall of the first accommodating groove (1211) and the first wiring board (122) to connect the two.

5. The special device for protecting a lightning arrester according to claim 4, characterized in that: The first fastener (123) is a first bolt, and the movable block (222) / conductive spring is connected with a lead wire (227), and the lead wire (227) is pressed by the head of the first bolt and the first wiring board (122).

6. The special device for protecting a lightning arrester according to claim 3, characterized in that: The movable block (222) is provided with an indicator (226) away from the second cover module (13), and the first installation cover (121) is provided with a plug hole through which the indicator (226) can pass.

7. The special device for protecting a lightning arrester according to claim 1, characterized in that: The shell (11) is filled with quartz sand (112).

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