Plasma jet triggering device for triggering gap switch and its application

Abstract

The present invention provides a plasma jet trigger device and its application for triggering a gap switch. The device comprises: an insulating fixture and a metal wire; wherein, a trigger groove corresponding to the metal wire is provided on the top of the insulating fixture, a trigger electrode is provided in each trigger groove, and the metal wire is provided on the side of the trigger electrode facing away from the bottom wall of the trigger groove; a lead-out wire corresponding to the trigger electrode is also provided on the insulating fixture, and one end of the lead-out wire is connected to the trigger electrode. The present invention realizes the connection between the lead-out wire and the metal wire through the trigger electrode, so as to input a high-voltage pulse to the trigger electrode through the lead-out wire, that is, applying a high-voltage pulse between the trigger electrode and the ground electrode body, causing the metal wire connected between the trigger electrode and the ground electrode body to undergo an electric explosion, that is, discharge and gasification to generate plasma, and the plasma can be ejected from the ground electrode body into the gas gap under the action of the microcavity high pressure, thereby realizing rapid conduction of the gas gap at a low working coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma triggering of high-voltage electrical appliances, and in particular to a plasma jet triggering device for triggering a gap switch and its application. Background Art

[0002] The gas-triggered gap switch is a fast-closing switch that uses sulfur hexafluoride (SF6) or SF6 / N2 gas as the insulating medium and utilizes plasma microcavity injection technology to conduct the main gap within 1ms. It can be used in parallel with a circuit breaker as a fast control and protection switch in power systems, solving the problem of fast grid protection.

[0003] At present, the commonly used triggering method for gas-triggered gap switches is high-voltage pulse plasma triggering. Research results show that high-voltage pulse plasma cannot meet the requirements of reliable contact at high voltage levels (such as DC 400kV trigger gap) due to insufficient plasma height and conductivity. Summary of the Invention

[0004] In view of this, the present invention proposes a plasma jet triggering device and application for triggering a gap switch, aiming to solve the problem that the height and conductivity of the jetted plasma of the existing high-voltage pulse plasma cannot meet the high voltage level for reliable contact.

[0005] On the one hand, the present invention provides a plasma jet trigger device for triggering a gap switch, the device comprising: an insulating fixture and a metal wire; wherein, a trigger slot corresponding to the metal wire is provided on the top of the insulating fixture, and a trigger electrode is provided in each of the trigger slots, and the metal wire is arranged on the side of the trigger electrode facing away from the bottom wall of the trigger slot, and one end of the metal wire is connected to the trigger electrode, and the other end is used to connect to the ground electrode body; the insulating fixture is also provided with a lead-out wire corresponding to the trigger electrode, one end of the lead-out wire is connected to the trigger electrode, and the other end extends to the outside of the insulating fixture, and is used to connect to an external capacitor to input a high-voltage pulse to the trigger electrode, causing the metal wire to explode electrically to generate plasma, and then causing the plasma to be ejected into the gas gap to achieve conduction of the gas gap.

[0006] Furthermore, in the plasma jet triggering device for triggering the gap switch, a metal wire fixing piece is provided on the side of the trigger electrode facing away from the bottom wall of the trigger slot, and the metal wire is passed through the metal wire fixing piece.

[0007] Furthermore, in the above-mentioned plasma jet triggering device for triggering the gap switch, a through hole is provided on the metal wire fixing piece along its axial direction, the metal wire is arranged in the through hole along the axial direction of the through hole, and one end of the metal wire is crimped between the metal wire fixing piece and the trigger electrode, and the other end is used to be crimped between the metal wire fixing piece and the ground electrode body.

[0008] Furthermore, in the plasma jet triggering device for triggering the gap switch, one end of the metal wire fixing piece is provided with a fixing protrusion, and one end of the trigger electrode is provided with a fixing groove adapted to the fixing protrusion.

[0009] Furthermore, in the above-mentioned plasma jet triggering device for triggering the gap switch, a wire installation groove is provided at one end of the trigger electrode facing away from the fixing groove, and the end of the lead wire is installed in the wire installation groove and connected to the inner wall of the wire installation groove.

[0010] Furthermore, in the plasma jet triggering device for triggering the gap switch, the metal wire fixing piece is partially disposed in the triggering groove and partially protrudes outside the triggering groove for being fixed to the ground electrode body.

[0011] Furthermore, in the above-mentioned plasma jet triggering device for triggering the gap switch, a wire fixing piece is provided at the bottom of the insulating fixing piece, and a wire fixing pressure plate is provided on at least one side thereof. The wire fixing pressure plate is detachably connected to the wire fixing piece for crimping the lead-out wire.

[0012] Furthermore, in the above-mentioned plasma jet triggering device for triggering the gap switch, the wire fixing part and the wall surface opposite to the wire fixing pressure plate are provided with corresponding crimping grooves, the wire fixing part and the crimping grooves on the wire fixing pressure plate are arranged opposite to each other to form a crimping hole, and the lead wire is passed through the crimping hole.

[0013] Furthermore, in the above-mentioned plasma jet triggering device for triggering the gap switch, the triggering groove is a cylindrical structure, and its inner diameter is larger than the inner diameter of the lead hole, so that the bottom wall of the triggering groove serves as an axial limiting platform for the trigger electrode.

[0014] Furthermore, in the plasma jet triggering device for triggering the gap switch, a protruding shaft is provided on the top of the insulating fixing member at each of the triggering grooves for mounting and positioning the insulating fixing member and the ground electrode body.

[0015] Furthermore, in the plasma jet triggering device for triggering the gap switch, the metal wire fixing member is an insulating member that is resistant to ablation and high temperature.

[0016] On the other hand, the present invention also proposes a ground electrode, which includes: a ground electrode body and the above-mentioned plasma jet triggering device for triggering the gap switch; wherein the plasma jet triggering device for triggering the gap switch is installed on the ground electrode body.

[0017] Furthermore, the above-mentioned ground electrode has a mounting groove on its body, in which the top of the insulating fixing and the metal wire are arranged; the ground electrode body is also provided with a spray hole, which is connected to the mounting groove, so that the plasma generated by the electric explosion of the metal wire is sprayed from the spray hole to the gas gap.

[0018] On the other hand, the present invention further provides a trigger gap switch, which is provided with the above-mentioned ground electrode.

[0019] The present invention provides a plasma jet trigger device, a ground electrode, and a trigger gap switch for triggering a gap switch. The plasma jet trigger device for triggering a gap switch is mounted to a ground electrode body via an insulating fixture. A lead wire is connected to a metal wire via the trigger electrode, so that a high-voltage pulse is input to the trigger electrode via the lead wire. A high-voltage pulse is applied between the trigger electrode and the ground electrode body, causing the metal wire connected therebetween to undergo an electrical explosion, i.e., discharge and vaporization to generate plasma. Under the action of the microcavity high pressure, the plasma can be ejected from the ground electrode body into the gas gap, thereby achieving rapid conduction of the gas gap at a low duty cycle. In other words, the plasma jet trigger device for triggering a gap switch, based on the metal wire electrical explosion triggering principle, achieves long-distance plasma triggering, has a high ejection height and high conductivity, and is suitable for long-distance triggering gaps at high voltage levels. This solves the problem of existing high-voltage pulse plasma, which cannot meet the requirements for reliable contact at high voltage levels due to the ejected plasma height and conductivity. Furthermore, the plasma jet trigger device for triggering a gap switch has a simple structure and reliable installation, meeting the requirements of laboratory plasma triggering characteristic research and being applicable to engineering products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0021] Figure 1 A schematic structural diagram of a ground electrode provided in an embodiment of the present invention;

[0022] Figure 2A schematic diagram of another structural direction of the ground electrode provided by an embodiment of the present invention;

[0023] Figure 3 A cross-sectional view of a ground electrode provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Example 1

[0026] See also Figures 1 to 3 , which illustrates a preferred structure of a ground electrode provided by an embodiment of the present invention. As shown, the ground electrode comprises a ground electrode body 6 and a plasma jet triggering device for triggering a gap switch. The plasma jet triggering device for triggering the gap switch is mounted on the ground electrode body 6. Specifically, the ground electrode body 6 may be provided with a mounting slot for mounting the device therein. For example, the ground electrode body 6 may be mounted on top of the device.

[0027] Continue to see Figures 1 to 3 The plasma jet triggering device for triggering the gap switch includes: an insulating fixing member 1, a trigger electrode 2, a metal fixing member 3, a metal wire 4 and a lead wire 5; wherein,

[0028] The top of the insulating fixing member 1 (relative to Figure 3 As shown in the figure, there are trigger slots 11 corresponding to the metal wires 4, each of which is provided with a trigger electrode 2. The metal wire 4 is located on the side of the trigger electrode 2 facing away from the bottom wall of the trigger slot 11 (as shown in the figure). Figure 3 As shown above), one end of the metal wire 4 is connected to the trigger electrode 2, and the other end is used to connect to the ground electrode body 6. Specifically, the upper end of the insulating fixture 1 is provided with a plurality of protruding shafts 12 corresponding one-to-one to the metal wires 4, and the ground electrode body 6 is provided with countersunk holes 61 corresponding one-to-one to and matching the protruding shafts 12. The protruding shafts 12 are clamped in the corresponding countersunk holes 61 for installation and positioning between the insulating fixture 1 and the ground electrode body 6. A trigger groove 11 is provided at each protruding shaft 12 for supporting the trigger electrode 2. The trigger electrode 2 is placed in the trigger groove 11, and the metal wire 4 is rotated along the axial direction of the insulating fixture 1 (as shown in FIG. Figure 3The trigger grooves 11, trigger electrode 2, and metal wire 4 are arranged above trigger electrode 2 (in the vertical direction shown). The bottom end of metal wire 4 is connected to trigger electrode 2; the top end of metal wire 4 is connected to ground electrode body 6. There is a one-to-one correspondence between trigger grooves 11, trigger electrode 2, and metal wire 4. There can be five of each, but other numbers are also possible and are not limited in this embodiment. Multiple trigger grooves 11 can be arranged at equal intervals along the circumference of insulating fixture 1.

[0029] The insulating fixing member 1 is also provided with a lead wire 5 corresponding to the trigger electrode 2. One end of the lead wire 5 (such as Figure 3 The top end shown in FIG) is connected to the trigger electrode 2, and the other end (as shown in FIG) is connected to the trigger electrode 2. Figure 3 The bottom end shown in the figure extends to the outside of the insulating fixture 1 and is used to connect an external capacitor to input a high-voltage pulse to the trigger electrode 2, causing the metal wire 4 to explode electrically to generate plasma, and then causing the plasma to be ejected into the gas gap to achieve conduction of the gas gap. Specifically, the insulating fixture 1 may also be provided with a lead hole 13 arranged along the axial direction of the insulating fixture 1. The lead hole 13 corresponds to and is connected to the trigger slot 11. The lead wire 5 is arranged in the corresponding lead hole 13, with the top end connected to the trigger electrode 2 and the bottom end extending to the outside of the insulating fixture 1 to connect to an external capacitor to input a high-voltage pulse to the trigger electrode 2. That is, a high-voltage pulse is applied between the trigger electrode 2 and the ground electrode body 6, causing the metal wire 4 connected between the trigger electrode 2 and the ground electrode body 6 to explode electrically to generate plasma. The plasma can be ejected from the ground electrode body 6 into the gas gap, thereby achieving rapid conduction of the gas gap at a low working coefficient. In this embodiment, the trigger groove 11 is a cylindrical structure with an inner diameter larger than the inner diameter of the lead hole 13, so that the bottom wall of the trigger groove 11 serves as an axial limiting platform for the trigger electrode 2, thereby achieving axial support and limitation of the trigger electrode 2.

[0030] Continue to see Figure 1 The ground electrode body 6 is provided with injection holes 62, which correspond one-to-one with the metal wire 4 and are used to direct the plasma generated by the electric explosion of the metal wire 4 into the gas gap, thereby conducting the gas gap. Specifically, the top of the ground electrode body 6 is provided with a plurality of injection holes 62, which correspond one-to-one with the metal wire 4. These injection holes 62 can be through-holes with a diameter of 1-3 mm to facilitate the ejection of plasma, thereby reliably conducting the gas gap between the ground electrode body 6 and the high-voltage electrode. Considering the ablation resistance and economic cost of the triggering process, the plasma ablation process can cause ablation of the ground electrode body 6. Therefore, the ground electrode body 6 can be made of the ablation-resistant CuW80 material.

[0031] Continue to see Figure 3 The trigger electrode 2 faces away from the bottom wall of the trigger groove 11 (eg Figure 1The trigger electrode 2 and the metal wire fixing member 3 may have the same outer diameter. The trigger electrode 2 and the metal wire fixing member 3 are arranged in the trigger groove 11 from top to bottom. In addition, the metal wire fixing member 3 is provided with a metal wire fixing member 3 along its axial direction (such as Figure 3 The vertical direction shown in FIG) is provided with a through hole 31, and the metal wire 4 is arranged in the through hole 31 along the axial direction of the through hole 31, with both ends (such as Figure 3 The upper and lower ends shown in the figure are respectively connected to the ground electrode body 6 and the trigger electrode 2; wherein, the tube through-hole 31 can be set at the center position of the wire fixing part 3, and the diameter can be 1-3mm. In this embodiment, in order to facilitate the connection of the wire 4, preferably, the bottom end of the wire 4 can be arranged horizontally and crimped between the wire fixing part 3 and the trigger electrode 2, so that the bottom end of the wire 4 can be connected to the trigger electrode 2. The top end of the wire 4 can be arranged horizontally and crimped between the wire fixing part 3 and the ground electrode body 6 to achieve the connection between the wire 4 and the ground electrode body 6; the top end of the wire 4 can be provided with aluminum foil to connect and fix the wire 4 to the wire fixing part 3. In this embodiment, in order to prevent the wire fixing part 3 from breaking at the moment of electric explosion of the wire 4, resulting in leakage of the plasma generated by the wire 4, preferably, the wire fixing part 3 is partially arranged in the trigger groove 11, and partially protrudes outside the trigger groove 11 for being fixed to the ground electrode body 6, that is, the total length of the trigger electrode 2 and the wire fixing part 3 as a whole (as shown in the figure) is 1-3mm. Figure 3 The vertical length shown in FIG) is greater than the depth of the trigger slot 11 (as shown in FIG). Figure 3 The vertical length shown is 1 / 4 (as shown in the figure), so that the exposed portion of the top of the metal wire fixture 3 is embedded in the countersunk hole 61 provided in the ground electrode body 6. The metal wire fixture 3 can be an ablation-resistant and high-temperature-resistant insulating member. This not only provides insulation between the trigger electrode 2 and the ground electrode body 6, but also prevents the metal wire fixture 3 from rupturing when an electrical explosion occurs in the metal wire 4.

[0032] Continue to see Figure 3 To achieve positioning between the trigger electrode 2 and the metal wire fixing member 3, preferably, one end of the metal wire fixing member 3 (such as Figure 3 The lower end shown in FIG) is provided with a fixing protrusion 32, and one end of the trigger electrode 2 (as shown in FIG) is provided with a fixing protrusion 32. Figure 3 The top end (shown in FIG. 1 ) is provided with a securing groove 21 adapted to the securing protrusion 32. Specifically, the securing protrusion 32 may be a cylindrical structure, and the securing groove 21 may be a cylindrical stop structure adapted to the securing protrusion 32, so that the wire fixing member 3 is placed above the trigger electrode 2 to form a whole.

[0033] Continue to see Figure 3 , the trigger electrode 2 faces away from the end of the fixing groove 21 (such as Figure 3The lower end shown in FIG) is provided with a wire installation groove 22, leading out the end of the wire 5 (as shown in FIG). Figure 3 The trigger electrode 2 (shown at the top) can be mounted in the wire mounting groove 22 and connected to the inner wall of the wire mounting groove 22. Specifically, the cross-section of the trigger electrode 2 can be H-shaped, with the fixing groove 21 at the top being adapted to fit the fixing protrusion 32, and the wire mounting groove 22 at the bottom being a tapered countersunk hole structure. The wire mounting groove 22 and the lead wire 5 can be fixed by welding.

[0034] Continue to see Figure 2 In order to achieve the overall fixation of the device, preferably, the insulating fixing member 1 is provided with a mounting hole 14 for fixing the insulating fixing member 1 to the ground electrode body 6. Specifically, the insulating fixing member 1 can be a cylindrical structure with a support platform provided at the bottom end. The cylindrical structure can be embedded in the interior of the ground electrode body 6, and the support platform is in contact with and connected to the bottom wall of the ground electrode body 6. The support platform is a disc structure, and a number of mounting holes 14 that pass through the support platform are provided on the support platform along its circumferential direction. In this embodiment, there are six mounting holes 14. Of course, other numbers can also be used in other embodiments, and this embodiment does not impose any limitation on them. The bottom of the ground electrode body 6 can be provided with threaded holes that correspond one-to-one to the mounting holes 14, so that the connection and fixation between the support platform and the ground electrode body 6 can be achieved through connectors such as screws.

[0035] Continue to see Figures 1 to 3 In order to avoid the shaking of the lead wire 5, preferably, a wire fixing member 7 is provided at the bottom of the insulating fixing member 1, and at least one side of the wire fixing member 7 (such as Figure 2 The left and right sides of the insulating fixture 1 are provided with a wire fixing plate 8, which is detachably connected to the wire fixing member 8 and is used to crimp the lead wire 5 to fix the lead wire 5, thereby solving the problem of unreliable welding points caused by the shaking of the lead wire 5. Specifically, the wire fixing member 7 can be a plate-shaped structure, which is arranged along the cross-section of the insulating fixture 1, and the wire fixing member 7 and the insulating fixture 1 can be an integrated structure. In this embodiment, there can be two wire fixing plates 8, which are respectively arranged on both sides of the wire fixing member 7, so that the two wire fixing plates 8 can respectively crimp different lead wires with the side walls of the wire fixing member 7. In this embodiment, the wall surfaces opposite to the wire fixing member 7 and the wire fixing plate 8 are provided with a one-to-one corresponding crimping groove. The crimping grooves on the wire fixing member 7 and the wire fixing plate 8 are arranged relative to each other to form a crimping hole 9, and the lead wire 5 is passed through the crimping hole 9. In this embodiment, two rows of crimping holes 9 are formed between the wire fixing plate 8 and the two side walls of the wire fixing member 7, respectively, so as to fix the lead wires 5 at corresponding positions.

[0036] In summary, the plasma jet triggering device and ground electrode for triggering a gap switch provided in this embodiment are installed between the device and the ground electrode body 6 via an insulating fixing member 1; the lead wire 5 and the metal wire 4 are connected via the trigger electrode 2, so that a high-voltage pulse is input to the trigger electrode 2 via the lead wire 5. That is, a high-voltage pulse is applied between the trigger electrode 2 and the ground electrode body 6, causing the metal wire 4 connected between the trigger electrode 2 and the ground electrode body 6 to undergo an electric explosion, that is, discharge and vaporization to generate plasma. The plasma can be ejected from the ground electrode body 6 into the gas gap under the action of the microcavity high pressure, thereby achieving rapid conduction of the gas gap at a low duty factor. In other words, the plasma jet triggering device for triggering a gap switch is based on the metal wire electric explosion triggering principle, realizes long-distance plasma triggering, and has a high ejection height and high conductivity. It is suitable for long-distance triggering gaps with high voltage levels, solving the problem that the ejected plasma height and conductivity of existing high-voltage pulse plasma cannot meet the requirements for reliable contact at high voltage levels. At the same time, the plasma jet triggering device for triggering a gap switch has a simple structure and reliable installation, which not only meets the requirements of laboratory plasma triggering characteristic research, but also can be applied in engineering products.

[0037] Example 2:

[0038] This embodiment also proposes a trigger gap-opening switch, which may include: the aforementioned ground electrode and high-voltage electrode; wherein the ground electrode and the high-voltage electrode are spaced apart to form a gas gap. Specifically, the ground electrode and the high-voltage electrode form a pair of electrodes. The pair of electrodes may be one or more pairs, and this embodiment does not impose any restrictions. The ground electrode and the high-voltage electrode in each pair are spaced apart, and a gas gap is formed between the ground electrode and the high-voltage electrode. The specific implementation process of the ground electrode can be referred to the above description and will not be repeated in this embodiment.

[0039] Since the ground electrode has the above-mentioned effects, the trigger gap open switch having the ground electrode also has corresponding technical effects.

[0040] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0041] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A plasma jet triggering device for triggering a gap switch, characterized in that: include: Insulating fixings and wires; wherein, The top of the insulating fixing member is provided with a trigger groove corresponding to the metal wire, and each of the trigger grooves is provided with a trigger electrode. The metal wire is arranged on the side of the trigger electrode facing away from the bottom wall of the trigger groove, and one end of the metal wire is connected to the trigger electrode, and the other end is used to connect to the ground electrode body; The insulating fixture is also provided with a lead-out wire corresponding to the trigger electrode, one end of the lead-out wire is connected to the trigger electrode, and the other end extends to the outside of the insulating fixture, and is used to connect an external capacitor to input a high-voltage pulse to the trigger electrode, so that the metal wire undergoes an electrical explosion to generate plasma, and then the plasma is ejected into the gas gap to achieve conduction of the gas gap.

2. The plasma jet triggering device for triggering a gap switch according to claim 1, characterized in that: A metal wire fixing piece is provided on a side of the trigger electrode facing away from the bottom wall of the trigger slot, and the metal wire is passed through the metal wire fixing piece.

3. The plasma jet triggering device for triggering a gap switch according to claim 2, characterized in that: The metal wire fixing piece is provided with a through hole along its axial direction, and the metal wire is arranged in the through hole along the axial direction of the through hole. Moreover, one end of the metal wire is crimped between the metal wire fixing piece and the trigger electrode, and the other end is used to be crimped between the metal wire fixing piece and the ground electrode body.

4. The plasma jet triggering device for triggering a gap switch according to claim 2, characterized in that: One end of the metal wire fixing piece is provided with a fixing protrusion, and one end of the trigger electrode is provided with a fixing groove matched with the fixing protrusion.

5. The plasma jet triggering device for triggering a gap switch according to claim 4, characterized in that: A wire installation groove is provided at one end of the trigger electrode facing away from the fixing groove, and the end of the lead wire is installed in the wire installation groove and connected to the inner wall of the wire installation groove.

6. The plasma jet triggering device for triggering a gap switch according to claim 2, characterized in that: The metal wire fixing piece is partially arranged in the triggering groove and partially protrudes outside the triggering groove for being fixed on the ground electrode body.

7. The plasma jet triggering device for triggering a gap switch according to any one of claims 1 to 6, characterized in that: A wire fixing piece is provided at the bottom of the insulating fixing piece, and a wire fixing pressure plate is provided on at least one side thereof. The wire fixing pressure plate is detachably connected to the wire fixing piece and is used for crimping the lead wires.

8. The plasma jet triggering device for triggering a gap switch according to claim 7, characterized in that: The wire fixing part and the wall surface opposite to the wire fixing plate are provided with corresponding crimping grooves. The wire fixing part and the crimping grooves on the wire fixing plate are arranged opposite to each other to form a crimping hole. The lead wire is passed through the crimping hole.

9. The plasma jet triggering device for triggering a gap switch according to any one of claims 1 to 6, characterized in that: The trigger groove is a cylindrical structure, and its inner diameter is larger than the inner diameter of the lead hole, so that the bottom wall of the trigger groove serves as an axial limiting platform for the trigger electrode.

10. The plasma jet triggering device for triggering a gap switch according to any one of claims 1 to 6, characterized in that: The top of the insulating fixing member is provided with a protruding shaft at each of the triggering grooves, which is used for installation and positioning between the insulating fixing member and the ground electrode body.

11. The plasma jet triggering device for triggering a gap switch according to any one of claims 1 to 6, characterized in that: The metal wire fixing part is an insulating part that is resistant to ablation and high temperature.

12. A ground electrode, characterized in that: include: A ground electrode body and a plasma jet triggering device for triggering a gap switch according to any one of claims 1 to 11; wherein the plasma jet triggering device for triggering a gap switch is mounted on the ground electrode body.

13. The ground electrode according to claim 12, wherein: The ground electrode body is provided with a mounting groove, and the top of the insulating fixing member and the metal wire are arranged in the mounting groove; The ground electrode body is further provided with a spray hole which is in communication with the mounting groove so that plasma generated by the electric explosion of the metal wire can be sprayed from the spray hole to the gas gap.

14. A trigger gap switch, characterized in that: A ground electrode as claimed in claim 12 or 13 is provided.

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