CN114498305A

CN114498305A - Overvoltage protection device

Info

Publication number: CN114498305A
Application number: CN202111628438.0A
Authority: CN
Inventors: 赵法强; 余春欢; 萧新敏; 马俊军; 刘瑞生; 付威; 罗洪佑; 龙海波; 林泽彬; 刘松; 任明欣
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-05-13
Anticipated expiration: 2041-12-28
Also published as: CN114498305B

Abstract

The invention relates to an overvoltage protection device, comprising: the sleeve comprises arc striking electrodes and an arc extinguishing assembly, the two arc striking electrodes are respectively arranged at two ends of the sleeve, a discharge gap is arranged between the two arc striking electrodes, the arc extinguishing assembly is arranged in the sleeve, and the arc extinguishing assembly is movably connected with the sleeve; the connecting wire is electrically connected with the arc striking electrode; and the wire clamp is used for tightly and electrically connecting the insulated wire with the connecting wire. The two ends of the sleeve are connected between any two phases of overhead insulated wires through the wire clamps and the connecting wires, and the lightning overvoltage on the insulated wires is guided to the sleeve through the connecting wires. When the thunder and lightning overvoltage occurs, the discharge gap between the two arc striking electrodes is broken down to form continuous electric arcs, the arc extinguishing assembly can form transient vacuum in the sleeve to extinguish the electric arcs, the interphase short circuit is eliminated, the overvoltage of the insulated wire is released, and the effect of protecting the insulated wire is achieved.

Description

Overvoltage protection device

Technical Field

The invention relates to the technical field of lightning protection of overhead insulated lines, in particular to an overvoltage protection device.

Background

The 10kV power distribution network has a complex network structure, few lightning protection measures and low lightning resistance level, the lightning stroke fault rate of the power distribution network under the overvoltage of lightning is high, and the lightning stroke disconnection is easy to occur, the main reason is that power frequency follow current electric arcs blow off a wire after the lightning stroke, the transient electric arc current is very short due to the flashover of an overhead insulated line caused by the overvoltage of lightning, the transient electric arc current can form a pinhole on an insulating layer of the insulated wire due to the lightning stroke flashover, a short-circuit channel is formed between two phases or three phases, the electric arc energy of the overhead insulated wire is suddenly increased, the electric arcs are prevented from sliding on the surface of the insulating layer of the overhead insulated wire, a high-temperature arc root is fixed at a breakdown point of the insulating layer, and the power frequency follow current electric arcs are intensively fixed at the insulating breakdown pinhole of the insulated wire and stably burn until the wire is blown before the action of a circuit breaker.

Generally, there are three ways to avoid lightning stroke disconnection of an overhead insulated line: the shielding wire is arranged, so that lightning overvoltage acting on a circuit is reduced, and the probability of interphase insulation flashover is reduced, and the construction cost is high; stripping a section of insulating layer at the position of the insulated conductor close to the tower, so that an arc root slides on the surface of the exposed conductor, energy is consumed, and the arc root is finally extinguished, wherein the mode needs to destroy the insulation and the sealing of the conductor; the lightning arrester is connected, overvoltage is released by utilizing the volt-ampere characteristic of the metal oxide resistor disc, power frequency follow current is cut off, and line lightning protection is carried out.

Disclosure of Invention

Therefore, it is necessary to provide an overvoltage protection device which has a simple structure, is easy to install, and has a low cost, and does not need to break the sealing performance of an insulated wire, in order to solve the problem that an overhead insulated wire is easy to be broken by lightning.

An overvoltage protection device, the overvoltage protection device comprising:

the sleeve comprises arc striking electrodes and an arc extinguishing assembly, the two arc striking electrodes are respectively arranged at two ends of the sleeve, a discharge gap is arranged between the two arc striking electrodes, the arc extinguishing assembly is arranged in the sleeve, and the arc extinguishing assembly is movably connected with the sleeve;

the connecting wire is electrically connected with the arc striking electrode;

and the wire clamp is used for tightly and electrically connecting the insulated wire with the connecting wire.

In one embodiment, the bushing comprises an insulating outer shell, an insulating inner shell and an end cover, wherein the insulating inner shell is a shell with an opening at one end, the opening end of the insulating inner shell is connected with the end cover, the other end of the insulating inner shell is connected with the insulating outer shell, the insulating inner shell and the end cover form a first cavity, and the insulating outer shell and the insulating inner shell form a second cavity; the arc striking electrode comprises a first electrode and a second electrode, the first electrode is far away from the insulating inner shell, one end of the opening is connected, the second electrode is connected with the end cover, the arc extinguishing assembly is arranged between the first electrode and the second electrode, the arc extinguishing assembly is movably connected with the insulating inner shell, the arc extinguishing assembly moves in the first cavity and is communicated with the second cavity, and short vacuum can be formed in the first cavity to extinguish electric arcs.

In one embodiment, the sleeve further includes a first opening, a second opening, an air inlet and an air outlet, the first opening is disposed on the insulating outer shell, the first opening is used for communicating the second cavity with the outside air, the second opening is disposed on the insulating inner shell, the arc extinguishing component includes a moving member, a reset member and a third opening, the third opening is disposed on the moving member, the third opening is used for forming an arc column, the moving member is disposed in the first cavity and located at the second opening, the moving member is movably connected with the insulating inner shell, the moving member moves in the first cavity, so that the first cavity is communicated with the second cavity through the second opening, one end of the reset member is connected with the moving member, and the other end of the reset member is connected with the second electrode, the reset piece is used for resetting the moving piece.

In one embodiment, the sleeve further comprises a sealing ring, and the sealing ring is arranged at the joint of the insulating inner shell and the end cover.

In one embodiment, the sleeve further comprises a protective cover, the protective cover is connected with the sleeve, and the protective cover is used for protecting two ends of the sleeve.

In one embodiment, the connecting wire comprises a connecting terminal and a bare wire end, the connecting terminal is provided with an external thread, the connecting wire is electrically connected with the arc striking electrode through the connecting terminal, and the bare wire end is electrically connected with the wire clamp.

In one embodiment, the wire clamp comprises an inner shell, an insulating cover, a first wiring hole, a second wiring hole and a compression bolt, wherein the first wiring hole penetrates through the wire clamp, the first wiring hole is used for electrically connecting an insulating wire, the second wiring hole is electrically connected with the connecting wire, the compression bolt is connected with the inner shell, the compression bolt is used for compressing the inner shell and the insulating wire and the connecting wire, the insulating cover is arranged outside the inner shell, and the inner shell is wrapped.

In one embodiment, the insulating cover comprises a first cover body, a second cover body and a connecting part, and the first cover body is movably connected with the second cover body through the connecting part.

In one embodiment, the insulation cover further comprises a sliding buckle lug and a buckling part, and the first cover body and the second cover body are connected and fixed in a matching mode through the sliding buckle lug and the buckling part.

In one embodiment, the insulation cover further comprises a clasping portion, and the clasping portion corresponds to the first wiring hole and/or the second wiring hole in position and extends out of the first wiring hole and/or the second wiring hole.

According to the overvoltage protection device, the arc striking electrodes are arranged at two ends of the sleeve, one end of the connecting wire is electrically connected with the insulated wire, the other end of the connecting wire is electrically connected with the arc striking electrodes, the insulated wire is closely and electrically connected with the connecting wire through the wire clamp, two ends of the sleeve are connected between any two phases of overhead insulated wires through the wire clamp and the connecting wire, and lightning overvoltage on the insulated wire can be guided to the sleeve through the connecting wire. When the thunder and lightning overvoltage occurs, the discharge gap between the two arc striking electrodes is broken down to form continuous electric arc and burn, the arc extinguishing assembly is arranged in the sleeve and movably connected with the sleeve, the arc extinguishing assembly can form transient vacuum in the sleeve to extinguish the electric arc, after the electric arc is extinguished, the insulation level between the two arc striking electrodes is improved, the voltage is recovered to be normal, the interphase short circuit is eliminated, the overvoltage of the insulated wire is released in the process, the electric arc burns in the sleeve, and the effect of protecting the insulated wire is achieved. The overvoltage protection device does not need to peel off the insulated wire, does not damage the seal of the insulated wire, and has the advantages of simple structure, easy installation, low early investment and low later maintenance cost.

Drawings

FIG. 1 is a schematic diagram of an overvoltage protection device;

FIG. 2 is a schematic view of an insulation state of an insulation sleeve;

FIG. 3 is a schematic diagram of a breakdown state of the bushing;

FIG. 4 is a schematic view of a connecting line structure;

fig. 5 is a schematic view of a wire clamp structure.

Description of the reference symbols:

10. a sleeve; 20. wire clamps; 30. a connecting wire; 40. an insulated wire; 50. electrons; 60. an electric arc;

11. an insulating housing; 12. an insulating inner case; 13. a first electrode; 14. a second electrode; 15. a reset member; 16. a moving member; 17. a seal ring; 18. an end cap;

111. a first opening; 112. a second cavity; 113. a protective cover; 121. a second opening; 122. a first cavity; 123. an air inlet; 161. a third opening; 181. an air outlet;

21. an inner housing; 22. an insulating cover; 23; a first wiring hole; 24. a second wiring hole; 25. a slide fastener lug; 26 a fastening part; 27. a hold-down bolt; 28. a connecting portion; 29. a clasping part;

31. a connection terminal; 32. the bare wire end.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to fig. 3, fig. 1 shows a schematic structural diagram of an overvoltage protection device in an embodiment of the present invention, fig. 2 shows a schematic insulating state diagram of an insulating sleeve 10 in an embodiment of the present invention, fig. 3 shows a schematic breakdown state diagram of the insulating sleeve 10 in an embodiment of the present invention, and in this embodiment, an embodiment of the present invention provides an overvoltage protection device, which includes: the arc extinguishing device comprises a sleeve 10, wherein the sleeve 10 comprises arc striking electrodes and an arc extinguishing assembly, the two arc striking electrodes are respectively arranged at two ends of the sleeve 10, a discharge gap is formed between the two arc striking electrodes, the arc extinguishing assembly is arranged in the sleeve 10 and movably connected with the sleeve 10, and the arc extinguishing assembly is used for forming short-time vacuum in the sleeve 10 to extinguish an arc 60; a connection line 30, the connection line 30 being electrically connected to the arc ignition electrode, the connection line 30 being adapted to be connected to the insulated wire 40 and to guide the generation of the lightning overvoltage on the insulated wire 40 to the bushing 10; the wire clamp 20, the wire clamp 20 is used for tightly and electrically connecting the insulated wire 40 with the connecting wire 30, and the wire clamp 20 and the connecting wire 30 are used for connecting the sleeve 10 between any two insulated wires 40. In the overvoltage protection device, the arc striking electrodes are arranged at two ends of the sleeve 10, one end of the connecting wire 30 is electrically connected with the insulated wire 40, the other end of the connecting wire 30 is electrically connected with the arc striking electrodes, the insulated wire 40 is closely and electrically connected with the connecting wire 30 through the wire clamp 20, two ends of the sleeve 10 are connected between any two phases of overhead insulated wires 40 through the wire clamp 20 and the connecting wire 30, and the lightning overvoltage on the insulated wire 40 can be guided to the sleeve 10 through the connecting wire 30. When thunder and lightning overvoltage appears, the discharge gap between two striking electrodes is punctured, form continuous electric arc 60 and burn, the arc extinguishing subassembly sets up in sleeve pipe 10, and with sleeve pipe 10 swing joint, the arc extinguishing subassembly can form short-term vacuum in sleeve pipe 10 in order to extinguish electric arc 60, electric arc 60 extinguishes the back, the insulation level between two striking electrodes improves, voltage recovery is normal, eliminate alternate short circuit, with this process release insulated wire 40 overvoltage, make electric arc 60 burn at sleeve pipe 10, play the effect of protection insulated wire 40. The overvoltage protection device does not need to peel off the insulated wire 40, does not seal the insulated wire 40, and is simple in structure, easy to install, and low in early-stage investment and later-stage maintenance cost.

Preferably, in one embodiment, the bushing 10 includes an insulating outer shell 11, an insulating inner shell 12 and an end cover 18, the insulating inner shell 12 is a shell with an opening at one end, the opening end of the insulating inner shell 12 is connected with the end cover 18, the other end of the insulating inner shell 12 is connected with the insulating outer shell 11, the insulating inner shell 12 and the end cover 18 form a first cavity 122, the insulating outer shell 11 and the insulating inner shell 12 form a second cavity 112, and the second cavity 112 is communicated with the outside air; the arc striking electrode comprises a first electrode 13 and a second electrode 14, the first electrode 13 is connected with one end, far away from the opening, of the insulating inner shell 12, the second electrode 14 is connected with the end cover 18, the arc extinguishing assembly is arranged between the first electrode 13 and the second electrode 14 and movably connected with the insulating inner shell 12, the arc extinguishing assembly is moved in the first cavity 122 to communicate the first cavity 122 with the second cavity 112, and therefore a short vacuum can be formed in the first cavity 122 to extinguish the arc 60. The installation of the arc extinguishing assembly is facilitated by the opening at one end of the insulating inner housing 12. When the overhead insulated wire generates induced lightning overvoltage, the discharge gap between the first electrode 13 and the second electrode 14 is broken down, the continuous arc 60 is generated and burned in the first cavity 122, and the air in the first cavity 122 instantaneously expands due to heat, so that the arc extinguishing assembly moves toward the end close to the end cover 18 relative to the insulating inner shell 12, the first cavity 122 is communicated with the second cavity 112, and is communicated with the outside air through the second cavity 112, the air of the first cavity 122 carries the electrons 50 to gush into the second cavity 112, the air pressure of the second cavity 112 is raised, and the electrons 50 are rapidly released to the outside air, when the bulk of the electrons 50 are released, a brief vacuum is formed in the first cavity 122, the arc 60 extinguishes, wherein the active electrons 50 are greatly reduced, the insulation level of the discharge gap between the first electrode 13 and the second electrode 14 is increased, the arc extinguishing assembly is reset, and the bushing 10 is restored to the insulation state. There is a response time to the tripping of the overhead insulated line and the overvoltage protection device described above can quickly release the overvoltage prior to tripping and extinguish the arc 60 by creating a vacuum in the first cavity 122, eliminating the risk of shorting the insulated wires 40 to each other.

Referring to fig. 2 and 3, in a further embodiment, the sleeve 10 further includes a first opening 111, a second opening 121, an air inlet 123 and an air outlet 181, the first opening 111 is disposed on the insulating outer shell 11, the first opening 111 is used for communicating the second cavity 112 with the outside air, the second opening 121 is disposed on the cylindrical surface of the insulating inner shell 12, the arc extinguishing assembly includes a moving member 16, a reset member 15 and a third opening 161, the third opening 161 is disposed on the moving member 16, the air inlet 123 is disposed on the end surface of the insulating inner shell 12, the air outlet 181 is disposed on the end cover 18, the third opening 161 is used for forming an arc column, the moving member 16 is disposed in the first cavity 122 and located at the second opening 121, the moving member 16 is movably connected with the insulating inner shell 12, the moving member 16 moves in the first cavity 122, so that the first cavity 122 is communicated with the second cavity 112 through the second opening 121, one end of the reset piece 15 is connected with the moving piece 16, the other end of the reset piece 15 is connected with the second electrode 14, and the reset piece 15 is used for resetting the moving piece 16. When the sleeve 10 is in the insulation state, the moving member 16 blocks the second opening 121, so that the first cavity 122 is isolated from the second cavity 112, and the first cavity 122 is air-insulated. When the overhead insulated line generates induced lightning voltage, the discharge gap between the first electrode 13 and the second electrode 14 is broken down, the sleeve 10 is in a breakdown state, an arc column is generated between the first electrode 13 and the second electrode 14 through the third opening 161 on the moving part 16, and a continuous arc 60 is formed, air in the first cavity 122 is rapidly heated and expanded due to the burning of the arc 60, so that the moving part 16 moves towards one end close to the end cover 18 relative to the insulated inner shell 12, the air pressure of the first cavity is balanced through the air inlet hole 123 and the air outlet hole 181, the moving part 16 smoothly moves until the second opening 121 is exposed, the resetting part 15 is compressed, the first cavity 122 is communicated with the second cavity 112, and is communicated with the outside air through the second cavity 112, the air in the first cavity 122 carries electrons 50 to gush into the second cavity 112 through the second opening 121, so that the air pressure of the second cavity 112 is increased, and the electrons 50 are rapidly released to the outside air through the first opening 111, when the plurality of electrons 50 are released, a brief vacuum is formed in the first cavity 122, and the arc 60 is extinguished, wherein the number of active electrons 50 is greatly reduced, the insulation level of the discharge gap between the first electrode 13 and the second electrode 14 is increased, the reset member 15 is restored, an acting force is applied to the moving member 16 to move away from the end cap 18, so that the moving member 16 is reset, and the sleeve 10 is restored to the insulation state. The overvoltage protection device has the advantages of simple structure, easiness in installation and rapid response, can automatically reset, improves the arc extinguishing capability, quickly recovers the insulation state of the sleeve 10, eliminates the interphase short circuit, protects an overhead insulated line and avoids the occurrence of lightning stroke disconnection accidents.

Optionally, the moving member 16 is a piston movably connected to the inner insulating housing 12, the restoring member 15 is an elastic member, one end of the elastic member is sleeved on the rod body of the piston, and the other end of the elastic member is sleeved on the second electrode 14. When the air in the first cavity 122 rapidly expands due to the combustion of the arc 60, the piston moves toward the end close to the end cap 18 relative to the inner insulating housing 12 and compresses the elastic member, and when a short vacuum is formed in the first cavity 122, the elastic member recovers to apply a force to the piston moving away from the end cap 18, so that the piston is reset and the bushing 10 returns to an insulating state. Optionally, the elastic member is a spring, one end of the spring is sleeved on the rod body of the piston, the other end of the spring is sleeved on the second electrode 14, when the air in the first cavity 122 is rapidly heated and expanded due to the combustion of the electric arc 60, the piston moves towards one end close to the end cover 18 relative to the inner insulating shell 12 and compresses the spring, and when a short vacuum is formed in the first cavity 122, the spring is restored, an acting force which is far away from the end cover 18 to move is given to the piston, so that the piston is reset, and the sleeve 10 is restored to an insulating state. The piston and the spring are simple in structure, easy to install and low in cost, the weight and the occupied space of the sleeve 10 are reduced, the arc extinguishing assembly is rapid in response and can automatically reset, and the arc extinguishing capacity is improved.

Preferably, the first opening 111 and/or the third opening 161 and/or the air inlet 123 and/or the air outlet 181 are tapered holes, the end with the smaller tapered hole diameter of the first opening 111 and/or the air outlet 181 is far away from the first cavity 122, and the end with the larger tapered hole diameter of the third opening 161 and/or the air inlet 123 is far away from the first cavity 122, so as to accelerate the speed of the electrons 50 spraying to the outside air, accelerate the vacuum formation in the first cavity 122, accelerate the arc extinguishing speed, shorten the action time of the overvoltage protection device, and further protect the insulated wire 40 from being broken by lightning.

Optionally, the inner insulating housing 12 is provided with a stepped hole, and the arc extinguishing assembly is disposed at one end of the stepped hole with a larger bore diameter and connected with the end cap 18. Preferably, the moving member 16 is disposed at one end of the large diameter stepped hole and abuts against the small diameter section of the stepped hole, so that when the air in the first cavity 122 expands due to the generation of the arc 60, the moving member 16 can only move to one end close to the end cap 18 to expose the second opening 121, thereby communicating the first cavity 122 with the second cavity 112, and compressing the reset member 15. When the arc 60 is extinguished, the first cavity 122 forms a short vacuum, the reset member 15 recovers, and an acting force for moving the moving member 16 away from the end cap 18 is given to the moving member 16 until the moving member 16 abuts against a section with a small bore diameter of the stepped hole, so that the moving member 16 is reset.

Preferably, in one embodiment, the bushing 10 further includes a sealing ring 17, and the sealing ring 17 is disposed at a joint of the inner insulating housing 12 and the end cap 18 to prevent dust and rain water from entering the first cavity and affecting the use condition of the overvoltage protection device.

Preferably, in one embodiment, the casing 10 further includes a protective cover 113, the protective cover 113 is connected to the casing 10, the protective cover 113 is used for protecting two ends of the casing 10, the width of the protective cover 113 decreases progressively, the side of the protective cover 113 close to the ground has a smaller width and is provided with a fracture, the two ends of the casing 10 are protected by the protective cover 113, and flowing water is guided to flow out through the fracture of the protective cover 113, so as to prevent substances such as dust, rain water and the like from invading the casing 10, and further influence the use condition of the overvoltage protection device.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a connection line 30 according to an embodiment of the present invention, in which the connection line 30 includes a connection terminal 31 and a bare wire end 32, the connection terminal 31 is provided with an external thread, the connection line 30 is electrically connected to an arc striking electrode through the connection terminal 31, and the bare wire end 32 is electrically connected to the clip 20. Optionally, the connection terminal 31 is a copper terminal, and is connected to the electrode through a screw thread of the connection terminal 31, so that the electrical connection stability is improved, and the installation is facilitated.

Referring to fig. 5, fig. 5 shows a schematic structural diagram of a wire clamp 20 according to an embodiment of the present invention, in one embodiment, the wire clamp 20 includes an inner housing 21, an insulating cover 22, a first wire connection hole 23, a second wire connection hole 24 and a pressing bolt 27, the first wire connection hole 23 penetrates through the wire clamp 20, the first wire connection hole 23 is used for electrically connecting an insulated wire 40, the second wire connection hole 24 is electrically connected with a connecting wire 30, the pressing bolt 27 is connected with the inner housing 21, the pressing bolt 27 is used for pressing the inner housing 21 against the insulated wire 40 and the connecting wire 30, the insulating cover 22 is disposed outside the inner housing 21 and wraps the inner housing 21. Optionally, the inner housing 21 is a thickened aluminum housing, so that the connecting wire 30 is in good point contact with the insulated wire 40 and is compressed by the compression bolt 27, the thickened aluminum housing improves the tolerance of the wire clamp 20 to the electric arc 60, improves the use effect of the wire clamp 20, and protects the wire clamp 20 through the insulating cover 22.

In one embodiment, the insulating cover 22 includes a first cover, a second cover and a connecting portion 28, and the first cover and the second cover are movably connected by the connecting portion 28. The first and second covers are opened to facilitate the connection of the insulated wire 40 and the connection wire 30 with the inner housing 21.

In one embodiment, the insulating cover 22 further includes a sliding button protrusion 25 and a fastening portion 26, and the first cover and the second cover are connected and fixed by the sliding button protrusion 25 and the fastening portion 26, so that the use is convenient.

In one embodiment, the insulation cover 22 further comprises a clasping portion 29, the clasping portion 29 corresponds to the first wiring hole 23 and/or the second wiring hole 24 and extends out of the first wiring hole 23 and/or the second wiring hole 24, the connection position of the insulated wire 40 and the connecting wire 30 with the wire clamp 20 is protected through the clasping portion 29, the connection position is stabilized, and the connection stability of the insulated wire 40 and the connecting wire 30 with the wire clamp 20 is improved.

In the overvoltage protection device, the arc striking electrodes are arranged at two ends of the sleeve 10, one end of the connecting wire 30 is electrically connected with the insulated wire 40, the other end of the connecting wire 30 is electrically connected with the arc striking electrodes, the insulated wire 40 is closely and electrically connected with the connecting wire 30 through the wire clamp 20, two ends of the sleeve 10 are connected between any two phases of overhead insulated wires 40 through the wire clamp 20 and the connecting wire 30, and the lightning overvoltage on the insulated wire 40 can be guided to the sleeve 10 through the connecting wire 30. When the thunder and lightning overvoltage occurs, the discharge gap between the two arc striking electrodes is broken down to form continuous electric arc 60 and burn, the arc extinguishing component is arranged in the sleeve 10 and movably connected with the sleeve 10, the arc extinguishing component can form transient vacuum in the sleeve 10 to extinguish the electric arc 60, after the electric arc 60 is extinguished, the insulation level between the two arc striking electrodes is improved, the voltage is recovered to be normal, the interphase short circuit is eliminated, the overvoltage of the insulating wire 40 is released in the process, the electric arc 60 burns in the sleeve 10, and the effect of protecting the insulating wire 40 is achieved. The overvoltage protection device does not need to peel off the insulated wire 40, does not seal the insulated wire 40, and is simple in structure, easy to install, and low in early-stage investment and later-stage maintenance cost.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An overvoltage protection device, characterized in that the overvoltage protection device comprises:

the connecting wire is electrically connected with the arc striking electrode;

2. The overvoltage protection device of claim 1, wherein the bushing comprises an outer insulating housing, an inner insulating housing, and an end cap, the inner insulating housing is a shell with an opening at one end, the open end of the inner insulating housing is connected to the end cap, the other end of the inner insulating housing is connected to the outer insulating housing, the inner insulating housing and the end cap define a first cavity, and the outer insulating housing and the inner insulating housing define a second cavity; the arc striking electrode comprises a first electrode and a second electrode, the first electrode is far away from the insulating inner shell, one end of the opening is connected, the second electrode is connected with the end cover, the arc extinguishing assembly is arranged between the first electrode and the second electrode, the arc extinguishing assembly is movably connected with the insulating inner shell, the arc extinguishing assembly moves in the first cavity and is communicated with the second cavity, and short vacuum can be formed in the first cavity to extinguish electric arcs.

3. The overvoltage protection device of claim 2, wherein the sleeve further comprises a first opening, a second opening, an air inlet and an air outlet, the first opening is disposed on the outer insulating housing, the first opening is configured to communicate the second cavity with the outside air, the second opening is disposed on the inner insulating housing, the arc extinguishing assembly comprises a moving member, a reset member and a third opening, the third opening is disposed on the moving member, the third opening is configured to form an arc column, the moving member is disposed in the first cavity and located at the second opening, the moving member is movably connected to the inner insulating housing, the moving member moves in the first cavity to communicate the first cavity with the second cavity through the second opening, and one end of the reset member is connected to the moving member, the other end of the reset piece is connected with the second electrode, and the reset piece is used for resetting the moving piece.

4. The overvoltage protection device of claim 2, wherein the bushing further comprises a seal ring disposed at a junction of the inner insulating housing and the end cap.

5. The overvoltage protection device of any one of claims 1 to 4, wherein the bushing further comprises a protective shield connected to the bushing, the protective shield being configured to protect both ends of the bushing.

6. The overvoltage protection device according to any one of claims 1 to 4 wherein the connection wire comprises a connection terminal, a bare wire end, the connection terminal being provided with an external thread, the connection wire being electrically connected to the arc ignition electrode through the connection terminal, the bare wire end being electrically connected to the wire clamp.

7. The overvoltage protection device of any one of claims 1 to 4, wherein the wire clamp includes an inner housing, an insulating cover, a first wire connecting hole, a second wire connecting hole and a compression bolt, the first wire connecting hole extends through the wire clamp, the first wire connecting hole is used for electrically connecting an insulated wire, the second wire connecting hole is electrically connected with the connecting wire, the compression bolt is connected with the inner housing, the compression bolt is used for compressing the inner housing with the insulated wire and the connecting wire, the insulating cover is arranged outside the inner housing to wrap the inner housing.

8. The overvoltage protection device of claim 7, wherein the insulating cover includes a first cover, a second cover, and a connection portion, the first cover and the second cover being movably connected by the connection portion.

9. The overvoltage protection device of claim 8, wherein the insulating cover further comprises a snap-fit protrusion and a buckling portion, and the first cover body and the second cover body are fixed by the snap-fit protrusion and the buckling portion in a matching manner.

10. The overvoltage protection device of claim 7, wherein the insulating cover further comprises a clasping portion corresponding in position to and extending out of the first and/or second wire receiving aperture.