CN211606057U - Bidirectional lightning protection and disconnection protection device for insulated conductor - Google Patents

Abstract

The utility model discloses a two-way lightning protection of insulated wire hits broken string protection device, insulator low pressure end are equipped with telluric electricity field, and the insulator high-pressure side is equipped with insulated wire and drainage wire, and the drainage wire is parallelly connected with insulated wire through the puncture fastener, and the drainage wire both sides all are equipped with the striking electrode, form the discharge protection clearance between striking electrode and the telluric electricity field. Because the utility model discloses the insulator both sides respectively have a discharge protection clearance, when any one side suffered the thunder and lightning overvoltage, the protection clearance all can move discharge, has two fastener to provide fault current jointly during discharge to insulated wire, drainage wire and striking electrode become the integration, protection clearance stable in structure, consequently the utility model has the characteristics of stable performance, action are reliable, the through-flow capacity is strong, can prevent insulated wire thunderbolt broken string trouble's emergence effectively, have ensured insulated wire's safety, have solved the poor, clearance distance unstable, the low technical problem of reliability of single discharge protection clearance power frequency afterflow ability.

Description

A kind of two-way lightning protection and disconnection protection device for insulated conductors

technical field

The utility model relates to the technical field of lightning protection for power distribution networks, in particular to a bidirectional lightning protection and disconnection protection device for insulated conductors.

Background technique

With the extensive use of 10kV overhead insulated conductors in urban and rural distribution networks, lightning strike accidents often occur on 10kV overhead insulated conductors. Long-term power outages often cause great social impact, and at the same time bring huge workload to line repairs, resulting in inestimable indirect economic losses. Therefore, lightning breakage has become a difficult problem for the safe and stable operation of overhead insulated conductors.

At present, the measures to prevent 10kV insulated conductor from being struck by lightning mainly include lightning arrester, single discharge gap, lightning protection insulator, etc. Each of these measures has some problems. Earth affects the availability of electricity. In addition, it is difficult to find the single-phase grounding when the insulation breakdown of the arrester occurs, which brings difficulties to the operation and maintenance, and leaves a safety hazard to the 10kV distribution network. After the lightning protection insulator acts due to the lightning strike protection gap, the power frequency freewheeling capability is poor, and the insulated wire is more likely to break when it is struck by lightning. A single discharge gap mainly exists after the installation of the discharge gap. Due to the change in the force of the insulated wire during operation, the electrode orientation of the discharge gap (the new installation is vertical to the ground, and it will change to the horizontal direction after operation) will change, which directly affects its protection. performance, and the protection function will be lost in severe cases. In addition, some single discharge gaps may cause the power frequency freewheeling capacity to fail to meet the requirements of the fault current due to material or process reasons, which will also cause the disconnection of the insulated wire after it is subjected to lightning overvoltage. Therefore, taking effective lightning protection measures to improve the ability of insulated conductors to prevent lightning strikes and breakage has a huge effect on the safe and stable operation of the power grid.

For example, Chinese patent document CN201075637 discloses a "puncture-type lightning arrester for preventing overhead insulated wire from being struck by lightning", including insulators and overhead insulated wires, characterized in that a puncture wire clip is installed on the overhead insulated wire, and the puncture wire clip is connected to a puncture wire. The extension conductor, the end of the piercing extension conductor is provided with an arc-shaped shielding electrode, and an insulating sheath is sleeved on the piercing extension conductor and the arc-shaped shielding electrode, wherein the end of the insulating sheath sleeved on the arc-shaped shielding electrode is open, and the arc-shaped shielding electrode is covered with an insulating sheath. The arc surface of the shielding electrode faces the lower metal electrode of the insulator, and the arc-shaped shielding electrode and the lower metal electrode of the insulator form a pair of discharge protection gaps. This patent document has only one arc-shaped shielding electrode, and only has a single discharge protection gap. When the insulated wire on the side without the protection gap is subjected to lightning overvoltage, the generated lightning overvoltage will move to the arc shape along the insulated wire. Shield the electrode, and then break down and discharge to the ground. When the lightning overvoltage is very high, the insulated wire will break down and flashover through the insulator to the ground when the lightning overvoltage is not moved to the protective gap during the movement of the lightning overvoltage, thereby causing the insulated wire to break down. . There is also a discharge protection gap during operation after installation due to the change in the force of the insulated wire, the electrode orientation of the discharge protection gap (when the high-voltage side protection electrode is newly installed, the vertical ground is facing the ground electrode, and after operation, it will change horizontally and deviate from the ground electrode. ) will change, which directly affects its protection performance, and will lose its protection function in severe cases. In addition, some single discharge protection gaps may cause the power frequency freewheeling capacity to fail to meet the requirements of the fault current due to material or process reasons. In this way, an accident of disconnection of the insulated wire after suffering from lightning overvoltage will also occur, and the reliability of the entire device is low.

SUMMARY OF THE INVENTION

The utility model is to solve the technical problems of only a single discharge protection gap, poor power-frequency freewheeling capability, unstable gap distance and low reliability in the existing lightning protection and disconnection protection device, and provides a bidirectional protection against insulated wire. Lightning strike disconnection protection device, two puncture clips are used on the insulated wire in parallel with a section of drain wire, both of the drain wires are provided with an arc-striking electrode, and the low-voltage end of the insulator supporting the insulated wire is provided with a grounding electrode for arc-striking. A discharge protection gap is formed between the electrode and the ground electrode, so that there are two connected puncture wire clips and two discharge protection gaps in the whole device, which significantly improves the flow capacity of fault current and improves the reliability of the protection device.

In order to achieve the above object, the utility model adopts the following technical solutions:

A bidirectional lightning strike and disconnection protection device for insulated wires comprises an insulator, an insulated wire, a ground electrode, a drain wire, a puncture wire clip and an arc strike electrode. The low voltage end of the insulator is provided with a ground electrode, and the high voltage end of the insulator An insulated wire and a drainage wire are provided. The drainage wire is connected in parallel with the insulated wire through a puncture clip. The two ends of the drainage wire are provided with arc-striking electrodes that are electrically connected, and a lightning discharge voltage is formed between the arc-striking electrode and the ground electrode. The discharge protection gap is less than the lightning flashover voltage of the insulator.

Two puncture clips are used on the insulated wire to connect a drain wire in parallel, and an arc-striking electrode is electrically connected on both sides of the drain wire. A grounding electrode is fixedly installed on the low-voltage end of the insulator supporting the insulated wire. The arc-striking electrode and the grounding electrode A discharge protection gap is formed between them. When the insulated wire is subjected to lightning overvoltage and its amplitude exceeds the lightning resistance level of the discharge protection gap, the puncture clip and the drain wire will lead the lightning overvoltage to the arc-striking electrode, and the arc-striking electrode is connected to the grounding electrode. After the breakdown discharge, the two puncture clips jointly provide the subsequent power frequency fault current. Compared with a single protection gap (the protection gap of only one puncture clip), the fault current flow capacity is significantly improved , so as to protect the insulated wire from being disconnected in the process of being subjected to lightning overvoltage. Both sides of the drain wire are electrically connected to the arc-striking electrode. No matter which side of the insulated wire is struck by lightning, the lightning overvoltage can be directed to the arc-striking electrode through the puncture wire clip and the drain wire nearby, and the arc-striking electrode is grounded. Electrode breakdown discharge. Avoid lightning overvoltage on the insulated wire on the other side of the insulator of a single protection gap. When the lightning overvoltage is very high, it will cause the insulated wire to strike the ground through the insulator when it does not move to the protection gap during the movement of the lightning overvoltage. Wear flashover, which will cause the disconnection of the insulated wire. Because the drain wire, the insulated wire and the arc-striking electrode are integrated, the structure is stable during operation, thus ensuring the distance of the protection gap is stable, and avoiding the distance of a single discharge protection gap due to instability in operation (when the high-voltage side protection electrode is newly installed, it is If the vertical ground faces the grounding electrode, it will change in the horizontal direction after operation) failure causes the lightning strike of the insulated wire to break. Since the fault current loaded on the insulated wire (fault current when the protection gap breakdown caused by lightning overvoltage causes interphase or three-phase short circuit) can flow into the drain wire through two puncture clips respectively, so as long as a single puncture clip can reach the The thermal stability value of the fault current is more than 55% (the total of 2 can reach more than 110%), the puncture clip will not be blown, and the accident of lightning strike of the insulated wire will not occur, avoiding the single discharge protection gap due to the Only one puncture clip provides the subsequent fault current, which causes the poor current-carrying capacity to cause the disconnection of the insulated wire, which improves the reliability of the device. The lightning discharge voltage of the discharge protection gap formed between the arc-striking electrode and the grounding electrode is less than the lightning flashover voltage of the insulator. When the lightning resistance level of the protective gap is high, the protective gap will break down first, so that the flashover of the insulator will not be caused, and the grounding breakdown of the insulated wire will not be caused, so as to protect the insulator from breaking and the insulated wire from breaking, effectively avoiding the insulator breakage. The hazards caused by the falling of insulated wires and the occurrence of power outages caused by broken insulated wires. There is no need for testing during operation, and it only needs to be installed in strict accordance with the requirements of the construction process. It can be maintenance-free in the later operation process, which greatly reduces the operation and maintenance cost. The utility model only needs to connect a section of drain wire in parallel on the overhead insulated line through two puncture clips, and electrically connect the drain wire with the arc-striking electrode, which is very convenient for the online retrofit of the existing overhead insulated line for lightning protection and the new insulation line installation, with better usability and economy.

Preferably, the ground electrode includes a fixed ground electrode and a movable ground electrode, the fixed ground electrode is fixedly connected to the low voltage end of the insulator, the movable ground electrode is provided with a U-shaped hole, and the movable ground electrode is crimped on the insulator Between the low-voltage terminal and the fixed ground electrode.

According to the protection requirements of the site, the moving ground electrode can be moved in the direction away from the arc-striking electrode or in the direction close to the arc-striking electrode, so as to adjust the distance of the discharge protection gap and expand the applicable scope of the protection device. When installing the lightning protection device on the running overhead insulated wire, it is not necessary to remove the insulator. When installing the lightning protection device on a new insulated wire line, install the insulator first, and then just loosen the nut that fastens the insulator. , insert the movable ground electrode between the low voltage end of the insulator and the fixed ground electrode, then adjust the distance from the arc-striking electrode according to the protection requirements, and fasten the nut of the insulator. Therefore, the installation is convenient, safe and reliable.

Preferably, the arc-striking electrode, the drain wire and the puncture wire clip are all provided with an insulating wrapping layer except for the end of the arc-striking electrode that is connected to the ground.

The arc-striking electrode, the drain wire and the puncture wire clip are all provided with an insulating wrapping layer except the end of the arc-striking electrode to the ground, and the insulation level of the insulating wrapping layer is the same as that of the insulated wire, and the insulation performance of the overhead insulated wire is not affected. After installing the lightning protection device, it can prevent the occurrence of phase-to-phase or three-phase short circuit and single-phase grounding fault caused by small animals and foreign objects touching the drainage wire, puncture wire clip and the upper end of the arc-striking electrode.

Preferably, the puncture wire clip includes an upper casing and a lower casing, the upper casing includes a first insulated wire puncturing part and a first drainage wire puncturing part, the first insulated wire puncturing part and a first drainage wire The wire puncture part is connected by a conductive sheet to form a conductive loop, the lower shell includes a second insulated wire puncture part and a second drainage wire puncture part, and the second insulated wire puncture part and the second drainage wire puncture part are connected by the conductive sheet A conductive loop is formed, the first insulated wire puncture part and the second insulated wire puncture part correspond to form an insulated wire puncture part, and the first drainage wire puncture part and the second drainage wire puncture part correspond to form a drainage wire puncture part, The inner walls of the insulated wire puncture part and the drainage wire puncture part are provided with evenly distributed puncture blades, and the upper casing and the lower casing are fixed by connecting fasteners.

The puncture wire clip has a simple overall structure, can install an insulated wire and a drainage wire at the same time, the installation process is simple, and the insulating layer of the insulated wire does not need to be stripped.

Preferably, the inner wall of the puncture part of the insulated wire and the inner wall of the puncture part of the drainage wire are provided with silicone grease.

In the process of clamping and fixing the puncture part of the insulated wire and the drainage wire, the puncture blade will pierce the insulating layer of the insulated wire and the drainage wire, and contact the inner conductor. At this time, the silicone grease on the inner wall will wrap the puncture blade and the insulation layer. The contact point between the wire and the insulation layer of the drainage wire can effectively prevent rainwater from entering the puncture clip from the front and back, prevent the insulation wire and the drainage wire from being defective due to water ingress and the increase in weight of the insulated wire after the water ingress affects the force and the distance to the ground, extending The service life of the insulated wires and drainage wires is prolonged, and the silicone grease can work normally for a long time in the natural environment.

Preferably, the upper casing side is provided with a card slot, and the lower casing side is provided with a card body corresponding to the card slot.

The combination of the card slot and the card body constitutes a waterproof structure, which effectively prevents rainwater from entering the puncture wire clip from the side, prevents the defect of the insulated wire and the drainage wire due to water ingress, and prolongs the service life of the insulated wire and the drainage wire.

Preferably, the grounding electrode includes a fixed grounding electrode and a moving grounding electrode, the fixed grounding electrode is fixedly connected to the low-voltage end of the insulator, and the contact portion between the fixed grounding electrode and the moving grounding electrode is in the shape of a terrace, so The movable grounding electrode is provided with a moving groove, and bolt holes are respectively provided on both sides of the moving groove, and the moving grounding electrode and the fixed grounding electrode are fixedly connected by bolts.

According to the protection requirements of the site, the moving ground electrode can be moved in the direction away from the arc-striking electrode or in the direction close to the arc-striking electrode, so as to adjust the distance of the discharge protection gap and expand the applicable scope of the protection device. The shape of the contact part between the fixed grounding electrode and the moving grounding electrode is in the shape of a terrace, which enlarges the contact area between the fixed grounding electrode and the moving grounding electrode, ensures the good conductivity and improves the reliability of the device.

Preferably, the contact surface between the moving groove and the fixed ground electrode is arc-shaped.

The contact surface between the moving groove and the fixed grounding electrode is arc-shaped. When the fixed grounding electrode and the moving grounding electrode are fixedly connected by bolts, it can effectively prevent the contact surface between the moving groove and the fixed grounding electrode from being in complete contact with the fixed grounding electrode due to tension. In this case, the good electrical conductivity is ensured and the reliability of the device is improved.

Therefore, the utility model has the following beneficial effects: the utility model parallels a section of drain wire on the insulated wire, electrically connects an arc-striking electrode on both sides of the drain wire, and forms a discharge protection gap between the arc-striking electrode and the ground electrode, When subjected to lightning overvoltage and its amplitude exceeds the lightning resistance level of the discharge protection gap, the puncture wire clip and the drain wire lead the lightning overvoltage to the arc-striking electrode, and the arc-striking electrode breaks down and discharges the ground electrode, thereby protecting the insulated wire No disconnection during lightning strikes. The arc-striking electrodes in the utility model are distributed on both sides of the insulator, and the lightning discharge voltage of the discharge protection gap is less than the lightning flashover voltage of the insulator. When subjected to lightning overvoltage, it will not cause the flashover of the insulator, let alone the insulated wire. Wire breakage, protect the insulator from breaking and the insulated wire from breaking, effectively avoid the harm caused by the falling of the insulated wire caused by the breaking of the insulator and the occurrence of power failures caused by the breaking of the insulated wire. Two puncture wire clips are installed on the insulated wire of the utility model, and the fault current (caused by lightning overvoltage) loaded on the insulated wire can flow into the drainage wire through the puncture wire clip respectively, so as long as a single puncture wire clip can reach more than 55% The thermal stability value of the fault current (the sum of the two can reach more than 110%), the puncture clip will not be blown, and the accident of lightning strike of the insulated wire will not occur, which improves the reliability of the device. The drainage wire, the insulated wire and the arc-striking electrode of the utility model form an integral body, and the structure is stable during operation, thereby ensuring the stability of the distance of the protection gap and avoiding the instability of the distance of a single discharge protection gap during operation (high voltage side protection during new installation). The electrode is perpendicular to the ground and faces the grounding electrode, and it will change to the horizontal direction after running.) The failure of the insulated wire causes the lightning strike of the insulated wire to break. The utility model avoids that the insulated wire of a single protection gap on the other side of the insulator of the protection gap is subject to lightning overvoltage. The ground breakdown flashover, which causes the disconnection of the insulated wire. The utility model does not need to be tested during operation, only needs to be installed in strict accordance with the requirements of the construction technology, and can be maintenance-free in the later operation process. The utility model only needs to connect a section of drain wire in parallel on the overhead insulated line through a puncture wire clip, electrically connect the drain wire with the arc-striking electrode, and add a movable ground electrode, which is very convenient for the existing overhead insulation line to prevent The online transformation of lightning strikes and the installation of new insulation lines have better usability and economy.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Figure 2 is a schematic structural diagram of the puncture wire clip of the present invention.

3 is a schematic structural diagram of a moving ground electrode in Embodiment 1 of the present invention.

FIG. 4 is a schematic structural diagram of Embodiment 2 of the present invention.

FIG. 5 is a front view of the ground electrode in Embodiment 2 of the present invention.

FIG. 6 is a side view of the ground electrode in Embodiment 2 of the present invention.

In the figure: 1. Grounding electrode, 11. Fixed grounding electrode, 12. Mobile grounding electrode, 13. U-shaped hole, 2. Insulator, 3. Insulated wire, 4. Drainage wire, 5. Piercing clip, 50, Nut, 51 , Upper shell, 52, Lower shell, 53, Conductive sheet, 54, Insulated wire piercing part, 55, Drainage wire piercing part, 56, Piercing blade, 57, Card slot, 58, Card body, 59, Bolt, 6 , Arc striking electrode, 7, moving groove.

Detailed ways

The present utility model will be further described below with reference to the accompanying drawings and specific embodiments.

Embodiment 1: A bidirectional lightning strike and disconnection protection device for insulated wires in this embodiment, as shown in Figures 1 to 3, includes a ground electrode 1, two insulators 2, an insulated wire 3, a drain wire 4, and two punctures Wire clip 5, two arc-striking electrodes 6. The ground electrode includes a fixed ground electrode 11 and two movable ground electrodes 12. One end of the movable ground electrode is provided with a U-shaped hole 13, and two sides of the U-shaped hole of the movable ground electrode are engraved with scales. The puncture wire clip includes an upper casing 51 and a lower casing 52 , the upper casing includes a first insulated wire puncturing part and a first drainage wire puncturing part, and the first insulated wire puncturing part and the first drainage wire puncturing part are connected by a conductive sheet 53 A conductive circuit is formed. The lower casing includes a second insulated wire puncture part and a second drainage wire puncture part. The second insulated wire puncture part and the second drainage wire puncture part are connected by a conductive sheet to form a conductive circuit. The first insulated wire puncture part and The second insulated wire piercing part corresponds to the insulated wire piercing part 54 , the first drainage wire piercing part and the second drainage wire piercing part correspond to the drainage wire piercing part 55 , and the inner walls of the insulated wire piercing part and the drainage wire piercing part are uniform The puncture blades 56 are distributed, the inner walls of the puncture part of the insulated wire and the puncture part of the drainage wire are coated with silicone grease; The card body 58 is integrated with the lower casing, the upper casing and the lower casing are fixed by connecting fasteners, and the connecting fasteners include bolts 59 and nuts 50 . The arc-striking electrode, the drain wire and the puncture wire clip are all wrapped with an insulating wrapping layer except the end of the arc-striking electrode to the ground. The insulation level of the insulating wrapping layer is consistent with that of the insulated wire. It is divided into three colors: red, yellow and green, which are consistent with the phase colors of the three phases A, B, and C.

The low-voltage ends of the two insulators are fixedly connected to the two ends of the fixed grounding electrodes, the movable grounding electrodes are fixedly connected between the low-voltage ends of the insulators and the fixed grounding electrodes by crimping, and the insulated wires are fixedly installed on the high-voltage ends of the insulators to drain current. The wire is connected in parallel and in parallel with the insulated wire through the puncture wire clip. The puncture blade in the puncture part of the insulated wire penetrates the insulating layer of the insulated wire, so that the puncture wire clip is connected to the conductor of the insulated wire, and the silicone grease on the inner wall of the insulated wire puncture part is wrapped. The contact part of the puncture blade and the insulating layer, the puncture blade in the puncture part of the drainage wire penetrates the insulating layer of the drainage wire, so that the puncture wire clip is connected with the conductor of the drainage wire, and the silicone grease on the inner wall of the puncture part of the drainage wire wraps the puncture blade and the drainage wire. At the contact part of the insulating layer, the two ends of the drain wire are electrically connected to the arc-striking electrodes, respectively, and the arc-striking electrode and the grounding electrode form a discharge protection gap with a lightning discharge voltage less than the lightning flashover voltage of the insulator. Move the moving ground electrode to the direction away from the arc-striking electrode or to the direction close to the arc-striking electrode, and then adjust the distance of the discharge protection gap.

A section of drain wire is connected in parallel on the insulated wire, and an arc-striking electrode is electrically connected on both sides of the drain wire. A ground electrode is fixedly connected to the low-voltage end of the insulator supporting the insulated wire, and a discharge protection is formed between the arc-striking electrode and the ground electrode. The distance of the discharge protection gap is adjusted according to the on-site protection requirements. When the insulated wire is subjected to lightning overvoltage and its amplitude exceeds the lightning resistance level of the discharge protection gap, the puncture clip and the drain wire will lead the lightning overvoltage to the arc-striking electrode. The arc-striking electrode breaks down and discharges the ground electrode, thereby protecting the insulated wire from breaking during the lightning strike. Both sides of the drain wire are electrically connected to the arc-striking electrode. No matter which side of the insulated wire is struck by lightning, the lightning overvoltage can be directed to the arc-striking electrode through the puncture wire clip and the drain wire nearby, and the arc-striking electrode is grounded. Electrode breakdown discharge, which improves the reliability of the device. Avoid lightning overvoltage on the insulated wire on the other side of the insulator of a single protection gap. When the lightning overvoltage is very high, it will cause the insulated wire to strike the ground through the insulator when it does not move to the protection gap during the movement of the lightning overvoltage. Wear flashover, which will cause the disconnection of the insulated wire. Because the drain wire, the insulated wire and the arc-striking electrode are integrated, the structure is stable during operation, thus ensuring the distance of the protection gap is stable, and avoiding the distance of a single discharge protection gap due to instability in operation (when the high-voltage side protection electrode is newly installed, it is If the vertical ground faces the grounding electrode, it will change to the horizontal direction after operation), which will cause the failure of protection and the failure of the insulated wire to break due to lightning strikes. Since the fault current loaded on the insulated wire (fault current when the protection gap breakdown caused by lightning overvoltage causes interphase or three-phase short circuit) can flow into the drain wire through two puncture clips respectively, so as long as a single puncture clip can reach the The thermal stability value of the fault current is more than 55% (the total of 2 can reach more than 110%), the puncture clip will not be blown, and the accident of lightning strike of the insulated wire will not occur, ensuring the safety of the insulated wire. The lightning discharge voltage of the discharge protection gap formed between the arc-striking electrode and the grounding electrode is less than the lightning flashover voltage of the insulator. When subjected to lightning overvoltage, it will not cause the flashover of the insulator, and will not cause the insulated wire to break. In this way, the insulator is not broken and the insulated wire is not broken, and the harm caused by the falling of the insulated wire caused by the rupture of the insulator can be effectively avoided and the occurrence of a power failure caused by the broken wire of the insulated wire. According to the protection requirements of the site, the moving ground electrode can be moved in the direction away from the arc-striking electrode or in the direction close to the arc-striking electrode, so as to adjust the distance of the discharge protection gap and expand the applicable scope of the protection device. There is a U-shaped hole on the end of the mobile ground electrode, the low voltage end of the insulator and the end of the fixed ground electrode. When installing the lightning protection device on the running overhead insulated wire, it is not necessary to remove the insulator and install it on the new frame of the insulated wire. In this lightning protection device, the insulator can be installed first, then just loosen the nut that fastens the insulator, insert the movable ground electrode between the low-voltage end of the insulator and the fixed ground electrode, and then adjust and strike the arc according to the protection requirements. The distance between the electrodes can be determined by tightening the nut of the insulator; at the same time, the device only needs to connect a drain wire in parallel on the overhead insulated line through the puncture clip, and electrically connect the drain wire to the arc-striking electrode, which is very convenient for existing overhead lines. The lightning protection of insulated lines is retrofitted online and installed on new insulated lines. Therefore, the device is easy to install, safe and reliable, and has good usability and economy.

Embodiment 2: A bidirectional lightning strike and disconnection protection device for an insulated wire in this embodiment, as shown in Figures 4 to 6 , the bidirectional lightning strike and disconnection protection device for an insulated wire described in this embodiment is grounded. Except for the electrodes, the rest of the structure is the same as that in Example 1. The grounding electrode in this embodiment includes a fixed grounding electrode and a moving grounding electrode. The shape of the contact portion between the fixed grounding electrode and the moving grounding electrode is in the shape of a terrace, and the contact portion between the fixed grounding electrode and the moving grounding electrode is engraved with a scale. There is a moving slot 7 on the top, and there are several bolt holes on both sides of the moving slot. The bolt holes are evenly distributed between the first and last ends of the moving slot. The contact surface of the moving slot and the fixed ground electrode (the bottom surface of the moving slot) In the shape of an arc, the side surface of the contact part between the fixed ground electrode and the movable ground electrode is connected with the side surface of the moving groove through bolts, so as to realize the fixed connection between the fixed ground electrode and the movable ground electrode.

The staff can move the mobile ground electrode away from the arc-striking electrode or in the direction close to the arc-striking electrode according to the protection requirements of the site. After moving to the designated position, tighten the bolts so that the fixed ground electrode and the mobile ground electrode are fixedly connected. , to adjust the distance of the discharge protection gap.

Claims (8)

1. The utility model provides a two-way lightning protection broken string protection device of insulated wire, its characterized in that includes insulator, insulated wire, telluric electricity field, drainage wire, puncture fastener and striking electrode, the low pressure end of insulator is equipped with telluric electricity field, the high-pressure end of insulator is equipped with insulated wire and drainage wire, the drainage wire is parallelly connected with insulated wire through the puncture fastener, the drainage wire both ends are equipped with the striking electrode of electricity connection, form the discharge protection clearance that thunder and lightning discharge voltage is less than insulator thunder and lightning flashover voltage between striking electrode and the telluric electricity field.

2. The insulated conductor bidirectional lightning protection device according to claim 1, wherein the ground electrode comprises a fixed ground electrode and a movable ground electrode, the fixed ground electrode is fixedly connected to the low-voltage end of the insulator, the movable ground electrode is provided with a U-shaped hole, and the movable ground electrode is crimped between the low-voltage end of the insulator and the fixed ground electrode.

3. The bidirectional lightning protection device according to claim 1, wherein the arc striking electrode, the drainage wire and the piercing connector are provided with an insulating coating layer except for the ground end of the arc striking electrode.

4. The insulated wire bidirectional lightning protection breakage protection device according to claim 1 or 3, wherein the puncture wire clamp comprises an upper housing and a lower housing, the upper housing comprises a first insulated wire puncture part and a first drainage wire puncture part, the first insulated wire puncture part and the first drainage wire puncture part are connected through a conducting strip to form a conducting loop, the lower housing comprises a second insulated wire puncture part and a second drainage wire puncture part, the second insulated wire puncture part and the second drainage wire puncture part are connected through a conducting strip to form a conducting loop, the first insulated wire puncture part and the second insulated wire puncture part correspondingly form an insulated wire puncture part, the first drainage wire puncture part and the second drainage wire puncture part correspondingly form a drainage wire puncture part, and the inner walls of the insulated wire puncture part and the drainage wire puncture part are provided with puncture blades which are uniformly distributed, the upper shell and the lower shell are fixed through connecting fasteners.

5. The insulated conductor bidirectional lightning protection device according to claim 4, wherein the inner wall of the insulated conductor puncture part and the inner wall of the drainage wire puncture part are both provided with silicone grease.

6. The device of claim 4, wherein the upper housing has a slot and the lower housing has a latch corresponding to the slot.

7. The bidirectional lightning protection device according to claim 1, wherein the ground electrode comprises a fixed ground electrode and a movable ground electrode, the fixed ground electrode is fixedly connected to the low-voltage end of the insulator, the contact portion of the fixed ground electrode and the movable ground electrode is in a shape of a step, a moving groove is formed in the movable ground electrode, bolt holes are formed in two sides of the moving groove respectively, and the movable ground electrode and the fixed ground electrode are fixedly connected through bolts.

8. The device of claim 7, wherein the contact surface of the moving groove and the fixed ground electrode is in the shape of a circular arc.

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