Arc extinguishing device and method for power transmission and distribution line

Abstract

The present invention discloses an arc extinguishing device and method for power transmission and distribution lines, and relates to the technical field of power system protection. The technical solution is as follows: the arc extinguishing mechanism is arranged on one side of a fixed insulator string, and the arc extinguishing mechanism includes an arc extinguisher, an arc-starting rod, and an upper end connecting plate and a lower end connecting plate, wherein the upper part of the insulator string is connected to the arc extinguisher, the arc extinguisher is connected to one end of the upper arc-starting rod, and the lower part of the insulator string is connected to one end of the lower arc-starting rod. The beneficial effects of the present invention are as follows: compared with the existing lightning protection gap, the advantage of the device is that it can extinguish the power frequency continuous current and ensure that the line does not trip. Compared with the zinc oxide lightning arrester, it has the advantages of fast shutdown speed, long service life, and large interruptable power frequency current; compared with the existing airflow jet arc extinguishing lightning protection gap technology, it has the advantages of being able to timely and reliably cut off the power frequency continuous current, being reusable, and having a long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of power system protection, and in particular to an arc extinguishing device and method for a power transmission and distribution line. Background Art

[0002] The information society has continuously put forward new requirements for the reliability of power supply, and the lightning failure rate ranks first among all types of failure rates in the power system. When the line overvoltage caused by lightning strikes causes the insulator string to flash over and develop into a stable power frequency arc, it will damage the insulator string and form a permanent fault; then it will cause the relay device to trip and the reclosing device to fail.

[0003] A lightning protection gap is a device that conducts lightning current on a line to the ground through a breakdown gap, which can protect line equipment from instantaneous overvoltage hazards. However, the arc ignited in the gap sometimes cannot be extinguished naturally, which will cause the line to trip. Therefore, a lightning protection gap with effective arc extinguishing ability is an important guarantee to prevent damage to insulator strings and reduce line failure rates.

[0004] Arc is a natural gas discharge phenomenon. Electrons escape from the metal surface of the contact due to primary electron emission. Gas atoms or molecules in the gap will produce electrons and ions due to ionization. When the ion concentration in the gap is large enough, the gap is electrically broken down and an arc occurs. If there is no ionizable medium (i.e. vacuum) in the gap, it will have a huge impact on the extinction of the arc.

[0005] Vacuum arc refers to an arc that is maintained by the high temperature melting of the contact electrodes under the intense field emission and gap breakdown after the vacuum gap is opened, and metal vapor is generated. When the power frequency continuous current approaches zero and the contact spacing increases, the plasma of the vacuum arc quickly spreads to the surroundings. After the arc current passes zero, the medium of the contact gap quickly changes from a conductor to an insulator, so the current is interrupted and the breaking ends.

[0006] Through investigation and research, the applicant found that in recent years, China has carried out a large number of theoretical, experimental and practical application studies on the problem of lightning flashover of power transmission and distribution lines, and has achieved a lot of results. Theoretical and applied research shows that although the existing lightning protection devices have a good effect on lightning protection, they still have shortcomings. For example, the arc extinguisher can only extinguish a small power frequency current. When the power load is large, it cannot effectively extinguish the arc, and the arc will always exist; the arc extinguishing reaction speed is slow and the power frequency arc cannot be extinguished quickly; the gap distance is not easy to adjust, and the limit voltage of the lightning protection gap cannot be adjusted. These problems will affect the stable and safe operation of the power system, and bring hidden dangers to the production and life of the power system, enterprises and people. Summary of the invention

[0007] In order to achieve the above-mentioned purpose of the invention and to address the above-mentioned technical problems, the present invention provides an arc extinguishing device and method for a power transmission and distribution line.

[0008] The technical solution is an arc extinguishing device for a power transmission and distribution line, comprising a fixed insulator string installed between cross arms, an upper hanging plate, an upper connecting plate and a lower hanging plate, and a lower connecting plate are respectively arranged at the upper and lower ends of the fixed insulator string in sequence, the upper part of the upper connecting plate is connected to the cross arm, and the lower part of the lower connecting plate is connected to the power transmission and distribution line through a U-shaped hanging ring, an arc extinguishing mechanism is arranged on one side of the fixed insulator string, and the arc extinguishing mechanism comprises two angle adjusters respectively arranged on one side of the upper connecting plate and the lower connecting plate, wherein the angle adjuster at the upper part is connected to the arc extinguisher, the arc extinguisher is connected to one end of the upper arc-starting rod, and the angle adjuster at the lower part is connected to one end of the lower arc-starting rod.

[0009] Preferably, the angle adjuster is a rectangular plate, and a connecting plate mounting hole for fixing with the upper and lower connecting plates is provided at one side of the angle adjuster, a fixing hole is provided at the corner of the other side opposite to the connecting plate mounting hole, and a plurality of adjustment holes are distributed in a circular array around the fixing hole.

[0010] Preferably, the upper and lower angle adjusters are respectively connected to the arc extinguisher and the lower arc-striking rod through two connecting plates, a connecting plate fixing hole is arranged in the middle of the connecting plate corresponding to the fixing hole, a connecting plate adjustment hole is arranged at one end of the connecting plate corresponding to the adjustment hole, the other end of the connecting plate located at the upper part is fixedly connected to the arc extinguisher, and the other end of the connecting plate located at the lower part is fixedly connected to the lower arc-striking rod.

[0011] Preferably, the upper and lower arc-striking rods are both in the shape of bent rods, and their free ends are arranged opposite to each other, and a gap is left between the free ends of the two arc-striking rods.

[0012] Preferably, the arc extinguisher includes a shell, which is an insulating shell. The interior of the shell is divided into a vacuum arc extinguishing chamber and a driving chamber. A static contact and a moving contact are arranged in the middle of the vacuum arc extinguishing chamber. The static contact and the moving contact are respectively connected to one end of a static conductive rod and a moving conductive rod on both sides. The other end of the static conductive rod passes through the shell and is fixedly connected to the angle adjuster; the other end of the moving conductive rod passes through the cavity wall of the vacuum arc extinguishing chamber and extends into the driving chamber, and the end of the moving conductive rod is connected to an armature arranged inside the driving chamber; an electromagnetic drive coil is arranged inside the driving chamber corresponding to the armature, and a gap is left between the opposite ends of the armature and the electromagnetic drive coil; the other end of the electromagnetic drive coil is connected to the upper arc-striking rod through a fixed rod, and an induction coil is wound around the outer periphery of the fixed rod, and the output end of the induction coil wire is electrically connected to the input end of the electromagnetic drive coil; the fixed rod is a conductive rod, and its rod body is connected to the rod body of the moving conductive rod through a conductive connecting rod. The conductive connecting rod is a connecting rod mechanism combination, including three conductive rod bodies hinged in sequence, one end of the conductive connecting rod is hinged to the fixed rod, and the other end is hinged to the movable conductive rod.

[0013] Preferably, a main shielding cover is provided inside the vacuum arc extinguishing chamber and around the static contact and the moving contact.

[0014] Preferably, inside the vacuum interrupter, an end shielding cover is provided around the connection between the ends of the static conductive rod and the dynamic conductive rod and the side wall of the vacuum interrupter. The main shielding cover and the end shielding cover are both prior art and will not be described in detail here.

[0015] Preferably, a boss is provided at one end of the moving conductive rod close to the moving contact, and a bellows is provided between the boss and the wall of the vacuum arc extinguishing chamber.

[0016] Preferably, an insulating cushion layer is provided between the connection between the movable conductive rod and the armature; and an insulating cushion layer is also provided between the connection between the electromagnetic drive coil and the fixed rod.

[0017] An arc extinguishing method based on an arc extinguishing device of a transmission and distribution line,

[0018] S1. Connect arc extinguishers in parallel at both ends of the fixed insulator string, and configure upper and lower arc-starting rods as protective gaps;

[0019] S2, when the voltage exceeds the limit voltage of the protection gap described in S1, the protection gap is broken down, generating a short-circuit freewheeling current at the power frequency;

[0020] S3. Under the effect of S2, an induced current is generated in the induction coil, and an electromagnetic force is generated in the electromagnetic driving coil;

[0021] S4. Under the action of the electromagnetic force of S3, the moving contact is driven to effectively shut down the arc extinguisher, and the arc on the protective gap will disappear naturally.

[0022] S5. When the arc disappears, there is no induced current in the induction coil, the electromagnetic force disappears, and the moving contact is reset by the reset spring and closed again.

[0023] The technical solution provided by the embodiment of the present invention has the following beneficial effects: compared with the existing lightning protection gap, the advantage of the device is that it can extinguish the power frequency continuous current to ensure that the line does not trip. Compared with the zinc oxide lightning arrester, it has the advantages of fast shutdown speed, long service life, and large interruption of power frequency current; compared with the existing airflow jet arc extinguishing lightning protection gap technology, it has the advantages of being able to timely and reliably cut off the power frequency continuous current, being reusable, and having a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0025] Figure 2 It is an enlarged schematic diagram of the angle adjuster according to an embodiment of the present invention.

[0026] Figure 3Schematic diagram of the arc extinguisher structure according to an embodiment of the present invention.

[0027] Figure 4 This is a gap limiting voltage variation curve diagram of an embodiment of the present invention.

[0028] Among them, the figure markings are: 1, fixed insulator string; 2, upper end hanging plate; 3, upper end connecting plate; 4, lower end hanging plate; 5, lower end connecting plate; 6, U-shaped hanging ring; 102, upper arc-starting rod; 103, lower arc-starting rod; 110, angle adjuster; 111, connecting plate mounting hole; 112, fixing hole; 113, adjusting hole; 200, arc extinguisher; 201, shell; 202, vacuum arc extinguishing chamber; 203, static contact; 204, moving contact; 205, static conductive rod; 206, moving conductive rod; 207, main shielding cover; 208, end shielding cover; 209, bellows; 210, drive chamber; 211, armature; 212, electromagnetic drive coil; 213, fixing rod; 214, induction coil; 215, conductive connecting rod; 216, insulating cushion layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0032] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0033] Example 1

[0034] See also Figures 1 to 3 The present invention provides an arc extinguishing device for a power transmission and distribution line, comprising a fixed insulator string 1 installed between cross arms, an upper hanging plate 2, an upper connecting plate 3, a lower hanging plate 4, and a lower connecting plate 5 are respectively arranged at the upper and lower ends of the fixed insulator string 1 in sequence, the upper part of the upper connecting plate 3 is connected to the cross arm, and the lower part of the lower connecting plate 5 is connected to the power transmission and distribution line through a U-shaped hanging ring 6, and an arc extinguishing mechanism is arranged on one side of the fixed insulator string 1, characterized in that the arc extinguishing mechanism includes two angle adjusters 110 respectively arranged on one side of the upper connecting plate 3 and the lower connecting plate 5, wherein the upper angle adjuster 110 is connected to the arc extinguisher 200, the arc extinguisher 200 is connected to one end of the upper arc-starting rod 102, and the lower angle adjuster 110 is connected to one end of the lower arc-starting rod 103.

[0035] The upper and lower arc-striking rods are both in the shape of bent rods, and their free ends are arranged opposite to each other, with a gap left between the free ends of the two arc-striking rods.

[0036] The arc extinguisher 200 includes a shell 201, which is an insulating shell. The interior of the shell 201 is divided into a vacuum arc extinguishing chamber 202 and a driving chamber 210. A static contact 203 and a moving contact 204 are arranged in the middle of the vacuum arc extinguishing chamber 202. The static contact 203 and the moving contact 204 are respectively connected to one end of a static conductive rod 205 and one end of a dynamic conductive rod 206. The other end of the static conductive rod 205 passes through the shell 201 and is fixedly connected to the angle adjuster; the other end of the dynamic conductive rod 206 passes through the cavity wall of the vacuum arc extinguishing chamber 202 and extends into the driving chamber 210. The end of the dynamic conductive rod 206 is connected to the driving chamber 210. The armature 211 is connected to the drive chamber 210; an electromagnetic drive coil 212 is arranged inside the drive chamber 210 corresponding to the armature 211, and a gap is left between the opposite ends of the armature 211 and the electromagnetic drive coil 212; the other end of the electromagnetic drive coil 212 is connected to the arc-starting rod 102 through a fixed rod 213, and an induction coil 214 is wound around the outer periphery of the fixed rod 213, and the output end of the induction coil 214 wire is electrically connected to the input end of the electromagnetic drive coil 212; the fixed rod 213 is a conductive rod, and its rod body is connected to the rod body of the moving conductive rod 206 through a conductive connecting rod 215. The conductive connecting rod 215 is a connecting rod mechanism combination, including three conductive rod bodies hinged in sequence, one end of the conductive connecting rod 215 is hinged to the fixed rod 213, and the other end is hinged to the moving conductive rod 206.

[0037] A main shielding cover 207 is provided inside the vacuum arc extinguishing chamber 202 and around the static contact 203 and the moving contact 204 .

[0038] Inside the vacuum interrupter chamber 202, an end shielding cover 208 is arranged around the connection between the ends of the static conductive rod 205 and the dynamic conductive rod 206 and the side wall of the vacuum interrupter chamber 202. The main shielding cover 207 and the end shielding cover 208 are both prior art and will not be described in detail here.

[0039] A boss is provided at one end of the moving conductive rod 206 close to the moving contact 204, and a bellows 209 is provided between the boss and the wall of the vacuum arc extinguishing chamber 202. The bellows 209 functions as a sealing device for dynamic sealing.

[0040] An insulating cushion layer 216 is provided between the connection between the movable conductive rod 206 and the armature 211 ; an insulating cushion layer 216 is also provided between the connection between the electromagnetic drive coil 212 and the fixed rod 213 .

[0041] A bushing is provided at the connection between the moving conductive rod 206 and the wall of the vacuum arc extinguishing chamber 202 .

[0042] When the present invention is used, the contact part of the vacuum arc extinguisher is installed in the vacuum arc extinguishing chamber to make an arc extinguisher by utilizing the characteristics of good insulation performance and arc resistance of vacuum (vacuum degree is less than 10-4mm mercury column), and the effect of suppressing power frequency continuous current is achieved by disconnecting the moving and static contacts sealed in the vacuum. When there is no lightning strike, the contact is in a closed state, and the lightning protection gap is connected in parallel at both ends of the insulator. When a lightning strike occurs, a large lightning current and lightning voltage are generated on the transmission and distribution line. When the lightning voltage exceeds the limit voltage of the protection gap, the lightning protection gap is broken down, and the power frequency short-circuit continuous current is generated. At this time, an induced current is generated in the induction coil, and an electromagnetic force is generated in the electromagnetic drive coil, which attracts the armature to move, drives the moving contact, and effectively shuts off the vacuum arc extinguisher, and the arc on the lightning protection gap will disappear naturally. When the arc disappears, there is no induced current on the induction coil, the electromagnetic force disappears, and the moving contact is reset under the action of the spring, and closes again, waiting for the next lightning strike.

[0043] When an operational overvoltage occurs in the power transmission and distribution lines, the device can also take effect quickly, producing the effect of preventing over-high voltage and quickly extinguishing arcs.

[0044] Example 2

[0045] Based on Example 1, an arc extinguishing method based on an arc extinguishing device of a power transmission and distribution line is as follows:

[0046] S1. Connect arc extinguishers in parallel at both ends of the fixed insulator string, and configure upper and lower arc-starting rods as protective gaps;

[0047] S2: When the voltage exceeds the limit voltage of the S1 protection gap, the protection gap breaks down, generating a short-circuit continuous current at the power frequency;

[0048] S3. Under the effect of S2, an induced current is generated in the induction coil, and an electromagnetic force is generated in the electromagnetic driving coil;

[0049] S4. Under the action of the electromagnetic force of S3, the moving contact is driven to effectively shut down the arc extinguisher, and the arc on the protective gap will disappear naturally.

[0050] S5. When the arc disappears, there is no induced current in the induction coil, the electromagnetic force disappears, and the moving contact is reset by the reset spring and closed again.

[0051] Example 3

[0052] Based on Example 1, the angle adjuster 110 is a rectangular plate, and a connecting plate mounting hole 111 for fixing with the upper and lower connecting plates is provided at one side of the angle adjuster 110, a fixing hole 112 is provided at the corner of the other side opposite to the connecting plate mounting hole 111, and a plurality of adjustment holes 113 are distributed in a circular array around the fixing hole.

[0053] The upper and lower angle adjusters 110 are respectively connected to the arc extinguisher 200 and the lower arc-striking rod 103 through two connecting plates. A connecting plate fixing hole is set in the middle of the connecting plate corresponding to the fixing hole 112, and a connecting plate adjustment hole is set at one end of the connecting plate corresponding to the adjustment hole 113. The other end of the upper connecting plate is fixedly connected to the arc extinguisher 200, and the other end of the lower connecting plate is fixedly connected to the lower arc-striking rod 103.

[0054] The adjustment angle range of the angle adjuster 110 is 90°.

[0055] The distance between electrodes can be determined according to the voltage requirement. Figure 4 Adjust the distance accordingly.

[0056] Example 4

[0057] An arc extinguisher includes a shell 201, the shell 201 is an insulating shell, the interior of the shell 201 is divided into a vacuum arc extinguishing chamber 202 and a driving chamber 210, a static contact 203 and a moving contact 204 are arranged in the middle of the vacuum arc extinguishing chamber 202, and the two sides of the static contact 203 and the moving contact 204 are respectively connected to one end of a static conductive rod 205 and a dynamic conductive rod 206, the other end of the static conductive rod 205 passes through the shell 201, and the end is fixedly connected to the angle adjuster; the other end of the dynamic conductive rod 206 passes through the cavity wall of the vacuum arc extinguishing chamber 202 and extends into the driving chamber 210, and the end of the dynamic conductive rod 206 is connected to the driving chamber 210. The armature 211 is connected to the drive chamber 210; an electromagnetic drive coil 212 is arranged inside the drive chamber 210 and corresponds to the armature 211, and a gap is left between the armature 211 and the opposite end of the electromagnetic drive coil 212; the other end of the electromagnetic drive coil 212 is connected to the arc-starting rod 102 through a fixed rod 213, and an induction coil 214 is wound around the outer periphery of the fixed rod 213, and the output end of the induction coil 214 wire is electrically connected to the input end of the electromagnetic drive coil 212; the fixed rod 213 is a conductive rod, and its rod body is connected to the rod body of the moving conductive rod 206 through a conductive connecting rod 215;

[0058] A main shielding cover 207 is provided inside the vacuum interrupter chamber 202 and around the static contact 203 and the moving contact 204;

[0059] Inside the vacuum interrupter chamber 202, an end shielding cover 208 is provided around the connection between the ends of the static conductive rod 205 and the dynamic conductive rod 206 and the side wall of the vacuum interrupter chamber 202;

[0060] A boss is provided at one end of the moving conductive rod 206 close to the moving contact 204, and a bellows 209 is provided between the boss and the wall of the vacuum arc extinguishing chamber 202;

[0061] An insulating cushion layer 216 is provided between the connection between the movable conductive rod 206 and the armature 211 ; an insulating cushion layer 216 is also provided between the connection between the electromagnetic drive coil 212 and the fixed rod 213 .

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An arc extinguishing device for a power transmission and distribution line, comprising a fixed insulator string (1) installed between cross arms, an upper hanging plate (2), an upper connecting plate (3), a lower hanging plate (4), and a lower connecting plate (5) arranged in sequence at the upper and lower ends of the fixed insulator string (1), the upper part of the upper connecting plate (3) is connected to the cross arm, and the lower part of the lower connecting plate (5) is connected to the power transmission and distribution line through a U-shaped hanging ring (6), and an arc extinguishing mechanism is arranged on one side of the fixed insulator string (1), characterized in that: The arc extinguishing mechanism comprises two angle adjusters (110) respectively arranged on one side of the upper end connecting plate (3) and the lower end connecting plate (5), wherein the angle adjuster (110) located at the upper part is connected to the arc extinguisher (200), the arc extinguisher (200) is connected to one end of the upper arc-striking rod (102), and the angle adjuster (110) located at the lower part is connected to one end of the lower arc-striking rod (103); The angle adjuster (110) is a rectangular plate, and a connecting plate mounting hole (111) for fixing the upper and lower connecting plates is provided at one side of the angle adjuster (110), a fixing hole (112) is provided at the corner of the other side opposite to the connecting plate mounting hole (111), and a plurality of adjustment holes (113) are distributed in a circular array around the fixing hole; The upper and lower angle adjusters (110) are respectively connected to the arc extinguisher (200) and the lower arc-striking rod (103) via two connecting plates; a connecting plate fixing hole is provided in the middle of the connecting plate corresponding to the fixing hole (112); a connecting plate adjusting hole is provided at one end of the connecting plate corresponding to the adjusting hole (113); the other end of the connecting plate located at the upper part is fixedly connected to the arc extinguisher (200); and the other end of the connecting plate located at the lower part is fixedly connected to the lower arc-striking rod (103).

2. The arc extinguishing device for power transmission and distribution lines according to claim 1, characterized in that: The upper and lower arc-striking rods are both in the shape of bent rods, and their free ends are arranged opposite to each other, and a gap is left between the free ends of the two arc-striking rods.

3. The arc extinguishing device for power transmission and distribution lines according to claim 1, characterized in that: The arc extinguisher (200) comprises a shell (201), the shell (201) being an insulating shell, the interior of the shell (201) being divided into a vacuum arc extinguishing chamber (202) and a driving chamber (210), a static contact (203) and a moving contact (204) being arranged in the middle of the vacuum arc extinguishing chamber (202), the two sides of the static contact (203) and the moving contact (204) being respectively connected to one end of a static conductive rod (205) and one end of a dynamic conductive rod (206), the other end of the static conductive rod (205) passing through the shell (201) and being fixedly connected to the angle adjuster; the other end of the dynamic conductive rod (206) passing through the cavity wall of the vacuum arc extinguishing chamber (202) and extending into the driving chamber (210), the end of the dynamic conductive rod (206) An armature (211) is connected and arranged inside the drive cavity (210); an electromagnetic drive coil (212) is arranged inside the drive cavity (210) and corresponding to the armature (211); a gap is left between the armature (211) and the opposite ends of the electromagnetic drive coil (212); the other end of the electromagnetic drive coil (212) is connected to the upper arc-starting rod (102) via a fixed rod (213); an induction coil (214) is arranged around the outer periphery of the fixed rod (213); the output end of the wire of the induction coil (214) is electrically connected to the input end of the electromagnetic drive coil (212); the fixed rod (213) is a conductive rod, and its rod body is connected to the rod body of the movable conductive rod (206) via a conductive connecting rod (215).

4. The arc extinguishing device for power transmission and distribution lines according to claim 3, characterized in that: A main shielding cover (207) is provided inside the vacuum arc extinguishing chamber (202) and around the static contact (203) and the moving contact (204); Inside the vacuum arc extinguishing chamber (202), an end shielding cover (208) is arranged around the connection between the ends of the static conductive rod (205) and the movable conductive rod (206) and the side wall of the vacuum arc extinguishing chamber (202).

5. The arc extinguishing device for power transmission and distribution lines according to claim 4, characterized in that: A boss is provided at one end of the moving conductive rod (206) close to the moving contact (204), and a bellows (209) is provided between the boss and the cavity wall of the vacuum arc extinguishing cavity (202).

6. The arc extinguishing device for power transmission and distribution lines according to claim 3, characterized in that: An insulating cushion layer (216) is provided between the connection between the moving conductive rod (206) and the armature (211); an insulating cushion layer (216) is also provided between the connection between the electromagnetic drive coil (212) and the fixed rod (213).

7. An arc extinguishing method based on the arc extinguishing device of a power transmission and distribution line according to claim 1, characterized in that: S1. Connect arc extinguishers in parallel at both ends of the fixed insulator string, and configure upper and lower arc-starting rods as protective gaps; S2, when the voltage exceeds the limit voltage of the protection gap described in S1, the protection gap is broken down, generating a short-circuit freewheeling current at the power frequency; S3. Under the effect of S2, an induced current is generated in the induction coil, and an electromagnetic force is generated in the electromagnetic driving coil; S4, under the action of the electromagnetic force of S3, drives the moving contact to effectively shut down the arc extinguisher, and the arc on the protective gap will disappear naturally; S5. When the arc disappears, there is no induced current in the induction coil, the electromagnetic force disappears, and the moving contact is reset by the reset spring and closed again.

8. A vacuum arc extinguisher, characterized in that: The invention comprises a shell (201), wherein the shell (201) is an insulating shell, and the interior of the shell (201) is divided into a vacuum arc extinguishing chamber (202) and a driving chamber (210). A static contact (203) and a moving contact (204) are arranged in the middle of the vacuum arc extinguishing chamber (202), and the two sides of the static contact (203) and the moving contact (204) are respectively connected to one end of a static conductive rod (205) and one end of a dynamic conductive rod (206), and the other end of the static conductive rod (205) passes through the shell (201) and is fixedly connected to the angle adjuster; the other end of the dynamic conductive rod (206) passes through the cavity wall of the vacuum arc extinguishing chamber (202) and extends into the driving chamber (210), and the end of the dynamic conductive rod (206) is connected to the drive chamber (210). An armature (211) is disposed inside the drive cavity (210); an electromagnetic drive coil (212) is disposed inside the drive cavity (210) and corresponding to the armature (211); a gap is left between the armature (211) and the opposite ends of the electromagnetic drive coil (212); the other end of the electromagnetic drive coil (212) is connected to an arc-starting rod (102) via a fixed rod (213); an induction coil (214) is wound around the outer periphery of the fixed rod (213); the output end of the wire of the induction coil (214) is electrically connected to the input end of the electromagnetic drive coil (212); the fixed rod (213) is a conductive rod, and its rod body is connected to the rod body of the movable conductive rod (206) via a conductive connecting rod (215); A main shielding cover (207) is provided inside the vacuum arc extinguishing chamber (202) and around the static contact (203) and the moving contact (204); Inside the vacuum arc extinguishing chamber (202), an end shielding cover (208) is provided around the connection between the ends of the static conductive rod (205) and the movable conductive rod (206) and the side wall of the vacuum arc extinguishing chamber (202); A boss is provided at one end of the moving conductive rod (206) close to the moving contact (204), and a bellows (209) is provided between the boss and the cavity wall of the vacuum arc extinguishing cavity (202); An insulating cushion layer (216) is provided between the connection between the moving conductive rod (206) and the armature (211); an insulating cushion layer (216) is also provided between the connection between the electromagnetic drive coil (212) and the fixed rod (213).

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