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

Bidirectional lightning protection and disconnection protection device for insulated conductor

Technical Field

The utility model belongs to the technical field of the power distribution network lightning protection technique and specifically relates to a two-way lightning protection broken string protection device of insulated wire is related to.

Background

Along with the 10kV overhead insulated conductors are largely used in urban and rural distribution networks, the 10kV overhead insulated conductors are frequently subjected to lightning stroke accidents, the 10kV overhead insulated conductors are mainly subjected to lightning stroke to cause insulated conductor breakage, large-area and long-time power failure is caused by the breakage accidents to cause great social influence, huge workload is brought to line repair, and indirect economic loss cannot be estimated. Therefore, the lightning breakage becomes a difficult problem of safe and stable operation of the overhead insulated conductor.

At present, measures for preventing the lightning stroke breakage of a 10kV insulated wire mainly comprise a lightning arrester, a single discharge gap, a lightning protection insulator and the like, and the measures have some problems respectively, for example, the lightning arrester needs to be subjected to preventive tests when running for a period of time (about 5 years), and the power supply feasibility is greatly influenced. In addition, the lightning arrester is difficult to find when single-phase grounding occurs due to insulation breakdown, the operation and maintenance are difficult, and potential safety hazards are left for a 10kV distribution network. After lightning strike protection clearance action, the power frequency follow current capability of the lightning protection insulator is poor, and the insulated conductor is more easily broken when being struck by lightning. The single discharge gap mainly has the problems that after the discharge gap is installed, due to the stress change of the insulated conducting wire in the running process, the electrode orientation of the discharge gap (vertical to the ground when newly installed and the electrode orientation can change towards the horizontal direction after running) can change, the protection performance of the discharge gap is directly influenced, and the protection function can be lost in the serious situation. In addition, due to the reasons of materials or processes, the power frequency follow current capacity of some single discharge gaps can not meet the requirement of fault current, and thus, the accident of disconnection of the insulated conductor after the insulated conductor is subjected to lightning overvoltage can also occur. Therefore, effective lightning protection measures are taken, and the lightning protection and disconnection prevention capability of the insulated conductor is improved, so that the safety and stability in operation of a power grid are greatly improved.

For example, chinese patent document CN201075637 discloses a "puncture-type lightning protection device for preventing lightning breakage of an overhead insulated conductor", which includes an insulator and an overhead insulated conductor, and is characterized in that a puncture wire clamp is mounted on the overhead insulated conductor, the puncture wire clamp is connected to a puncture extension conductor, an arc-shaped shielding electrode is disposed at an end of the puncture extension conductor, an insulating sheath is sleeved on the puncture extension conductor and the arc-shaped shielding electrode, an end of the insulating sheath sleeved on the arc-shaped shielding electrode is open, an arc surface of the arc-shaped shielding electrode faces a metal electrode at a lower portion of the insulator, and the arc-shaped shielding electrode and the metal electrode at the lower portion of. This patent document is only provided with an arc-shaped shielding electrode, and only has a single discharge protection gap, and when the insulated wire on the side where no protection gap exists is subjected to lightning overvoltage, the generated lightning overvoltage can move to the arc-shaped shielding electrode along the insulated wire, and then breakdown to the ground to discharge, and when the lightning overvoltage is very high, the insulated wire can cause the insulated wire to breakdown to the ground through an insulator when the lightning overvoltage does not move to the protection gap in the lightning overvoltage moving process, thereby causing the disconnection fault of the insulated wire. The problem that the electrode orientation of the discharge protection gap (the high-voltage side protection electrode faces the grounding electrode vertically when being newly installed and can deviate from the grounding electrode towards the horizontal direction after operation) can change due to the stress change of the insulated wire in the operation process after the discharge protection gap is installed also exists, the protection performance of the discharge protection gap is directly influenced, and the protection function can be lost in serious cases. In addition, due to the reasons of materials or processes, the power frequency follow current capacity of the single discharge protection gap cannot meet the requirement of fault current, so that the accident of disconnection of the insulated conductor after the insulated conductor is subjected to lightning overvoltage can also occur, and the reliability of the whole device is low.

Disclosure of Invention

The utility model relates to a solve and only have single discharge protection clearance among the current lightning protection broken string protection device, power frequency afterflow capacity is poor, the clearance distance is unstable, the technical problem that the reliability is low, a two-way lightning protection broken string protection device of insulated wire is provided, adopt one section parallel connection of 2 puncture fastener on insulated wire, two surveys of drainage wire all is equipped with an arc electrode, insulator low pressure end at the support insulated wire is equipped with telluric electricity field, form the discharge protection clearance between arc electrode and the telluric electricity field, make whole device have puncture fastener and two discharge protection clearances of two connections, show the through-flow capacity that has improved fault current, the reliability of this protection device has been improved.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a two-way lightning protection of insulated wire breaks protection device, includes insulator, insulated wire, telluric electricity field, drainage line, 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 line, the drainage line is parallelly connected with insulated wire through the puncture fastener, the drainage line 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.

A section of drainage wire is parallelly connected with 2 puncture wire clamps on an insulated wire, two sides of the drainage wire are respectively and electrically connected with an arc striking electrode, a grounding electrode is fixedly installed at the low-voltage end of an insulator supporting the insulated wire, a discharge protection gap is formed between the arc striking electrode and the grounding electrode, when the insulated wire is subjected to lightning overvoltage and the amplitude of the lightning overvoltage exceeds the lightning-resistant level of the discharge protection gap, the puncture wire clamps and the drainage wire lead the lightning overvoltage to the arc striking electrode, the arc striking electrode carries out breakdown discharge on the grounding electrode, the 2 puncture wire clamps jointly provide subsequent power frequency fault current after breakdown discharge, compared with a single protection gap (only the protection gap of 1 puncture wire clamp), the through-flow capacity of the fault current is remarkably improved, and the insulated wire is protected from being broken in the lightning overvoltage process. The two sides of the drainage wire are electrically connected with the arc striking electrode, no matter which side of the insulated wire is struck by lightning, the lightning overvoltage can be led to the arc striking electrode nearby through the puncture wire clamp and the drainage wire, and the arc striking electrode is used for discharging in a breakdown mode to the grounding electrode. The insulated wire on the other side of the protection gap insulator in the single protection gap is prevented from being subjected to lightning overvoltage, and when the lightning overvoltage is very high, the insulated wire is subjected to breakdown flashover to the ground through the insulator when the insulated wire does not move to the protection gap in the lightning overvoltage moving process, so that the disconnection fault of the insulated wire is caused. The drainage wire, the insulated wire and the arc striking electrode form a whole, and the structure is stable in operation, so that the distance of a protection gap is ensured to be stable, and the fault that the lightning stroke of the insulated wire breaks due to the fact that the distance of a single discharge protection gap is unstable in operation (the high-voltage side protection electrode faces to the grounding electrode vertically when being newly installed and can change towards the horizontal direction after operation) fails is avoided. As fault current loaded on the insulated conductor (fault current caused by breakdown of a protection gap due to lightning overvoltage and during three-phase short circuit) can flow into the drainage wire through the 2 puncture wire clamps respectively, the puncture wire clamps cannot be blown as long as a single puncture wire clamp can reach a thermal stability value of the fault current of more than 55% (the sum of the 2 puncture wire clamps can reach more than 110%), the accident of the insulated conductor broken by lightning stroke cannot occur, the accident that the insulated conductor broken by the current carrying capacity is poor due to the fact that only one puncture wire clamp provides subsequent fault current in a single discharge protection gap is avoided, and the reliability of the device is improved. The thunder and lightning discharge voltage of the discharge protection gap formed between the arc striking electrode and the grounding electrode is smaller than the thunder and lightning flashover voltage of the insulator, when the thunder and lightning overvoltage is suffered, when the amplitude of the thunder and lightning overvoltage exceeds the thunder and lightning resistant level of the protection gap between the arc striking electrode and the grounding electrode, the protection gap is preferentially punctured, the flashover of the insulator cannot be caused, the ground can not be punctured by the insulated conductor, the insulator is protected from being broken, the insulated conductor is not broken, and the power failure accident caused by the fact that the insulated conductor falls to cause damage and the broken insulated conductor due to the breakage of the insulator is effectively avoided. The test is not needed in the operation, the installation is only needed to be strictly carried out according to the construction process requirement, the maintenance can be avoided in the later operation process, and the operation and maintenance cost is greatly reduced. The utility model discloses only need on overhead insulated wire through 2 parallelly connected one section drainage wires of puncture fastener to be connected the drainage wire with the striking electrode electricity, very conveniently have the installation of the online transformation and the new insulating line of overhead insulated wire lightning protection stroke, have better usability and economic nature.

Preferably, the grounding electrode comprises a fixed grounding electrode and a movable grounding electrode, the fixed grounding electrode is fixedly connected to the low-voltage end of the insulator, the movable grounding electrode is provided with a U-shaped hole, and the movable grounding electrode is pressed between the low-voltage end of the insulator and the fixed grounding electrode.

According to the protection requirement of the site, the movable grounding electrode can be moved to the direction far away from the arc ignition electrode or to the direction close to the arc ignition electrode, so that the distance of the discharge protection gap is adjusted, and the application range of the protection device is expanded. Need not to take off the insulator when installing this lightning protection device additional on the overhead insulated wire of operation, install the insulator earlier when this lightning protection device is installed to new insulated wire circuit, only need loosen the nut of fastening insulator next, will remove telluric electricity field and inject between insulator low pressure end and the fixed telluric electricity field, then according to the requirement of protection adjust well and the distance between the striking electrode, fasten the nut of good insulator can, consequently, simple to operate and safe and reliable.

Preferably, the arc striking electrode, the drainage wire and the puncture wire clamp are all provided with insulating coating layers except the ground end part of the arc striking electrode.

The arc striking electrode, the drainage wire and the puncture wire clamp are all provided with insulating coating layers except the ground end part of the arc striking electrode, the insulating level of the insulating coating layers is consistent with the insulating level of an insulating lead, the insulating property of the overhead insulating lead is not influenced, and the occurrence of interphase or three-phase short circuit and single-phase ground fault caused by touching the upper ends of the drainage wire, the puncture wire clamp and the arc striking electrode by small animals and foreign matters after the lightning protection device is additionally arranged is prevented.

Preferably, the puncture wire clamp comprises an upper shell and a lower shell, the upper shell comprises a first insulated wire puncture part and a first drainage wire puncture part, the first insulating lead puncture part and the first drainage lead puncture part are connected through a conducting strip to form a conducting loop, the lower shell comprises a second insulated wire puncture part and a second drainage wire puncture part which 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 thread puncturing part and the second drainage thread puncturing part correspondingly form a drainage thread puncturing part, the inner walls of the insulated wire puncture part and the drainage wire puncture part are provided with puncture blades which are uniformly distributed, and the upper shell and the lower shell are fixed through connecting fasteners.

The puncture wire clamp is simple in overall structure, capable of simultaneously installing an insulated wire and a drainage wire, simple and convenient in installation process, and free of stripping the insulating layer of the insulated wire.

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

Carry out the insulating layer that presss from both sides tight fixed in-process puncture blade can impale insulated wire and drainage wire to insulated wire and drainage wire puncture portion, contact with inside electric conductor, the silicone grease of inner wall can wrap up the contact point of puncture blade and insulated wire and drainage wire insulating layer this moment, effectively prevent that the rainwater from entering into the puncture fastener in the past at the back, prevent insulated wire and drainage wire because of intaking arouse defect and insulated wire intake after increase weight influence atress and to ground distance, the life of insulated wire and drainage wire has been prolonged, and the silicone grease can be in natural environment normal work for a long time.

Preferably, the upper shell side is provided with a clamping groove, and the lower shell side is provided with a clamping body corresponding to the clamping groove.

The combination of draw-in groove and the card body has constituted waterproof construction, prevents effectively that the rainwater edgewise from entering into the puncture fastener, prevents that insulated wire and drainage wire from arousing the defect because of intaking, has prolonged insulated wire and drainage wire's life.

Preferably, the grounding electrode comprises a fixed grounding electrode and a movable grounding electrode, the fixed grounding electrode is fixedly connected to the low-voltage end of the insulator, the contact part of the fixed grounding electrode and the movable grounding electrode is in a trapezoidal table shape, a movable groove is formed in the movable grounding electrode, bolt holes are formed in two sides of the movable groove respectively, and the movable grounding electrode and the fixed grounding electrode are fixedly connected through bolts.

According to the protection requirement of the site, the movable grounding electrode can be moved to the direction far away from the arc ignition electrode or to the direction close to the arc ignition electrode, so that the distance of the discharge protection gap is adjusted, and the application range of the protection device is expanded. The contact part of the fixed grounding electrode and the movable grounding electrode is in a trapezoidal shape, so that the contact area of the fixed grounding electrode and the movable grounding electrode is enlarged, the good conductivity is guaranteed, and the reliability of the device is improved.

Preferably, the contact surface between the moving groove and the fixed ground electrode is in the shape of a circular arc.

The contact surface of the movable groove and the fixed grounding electrode is arc-shaped, so that when the fixed grounding electrode and the movable grounding electrode are fixedly connected through the bolt, the situation that the contact surface of the movable groove and the fixed grounding electrode cannot be in complete contact with the fixed grounding electrode due to tension can be effectively avoided, the good conductivity is guaranteed, and the reliability of the device is improved.

Therefore, the utility model discloses following beneficial effect has: the utility model discloses a parallel one section drainage wire that connects in parallel on insulated wire, an arc electrode is connected to the both sides electricity respectively of drainage wire, forms the discharge protection clearance between arc electrode and the telluric electricity field, when suffering thunder and lightning overvoltage and its amplitude surpass the resistant thunder level in discharge protection clearance, puncture fastener and drainage wire lead the thunder and lightning overvoltage to the arc electrode on, the arc electrode punctures discharge to the telluric electricity field of arc electrode to insulated wire can not the broken string at the thunderbolt in-process has been protected. The utility model provides an arcing electrode distributes and is less than insulator thunder and lightning flashover voltage at the both sides of insulator and the thunder and lightning discharge voltage in discharge protection clearance, when suffering the thunder and lightning overvoltage, can not arouse the flashover of insulator, more can not arouse the insulated wire broken string, and the protection insulator is unbroken and the insulated wire is unbroken, effectively avoids leading to the emergence of the power failure accident that harm and insulated wire broken string caused that the insulated wire dropped to bring because of the insulator fracture. The utility model discloses install 2 puncture fastener on the insulated wire, the fault current of loading on the insulated wire (thunder and lightning overvoltage leads to) can flow in the drainage wire through puncture fastener respectively, consequently as long as single puncture fastener can reach fault current's more than 55% thermal stability value (2 add up and can reach more than 110%), puncture fastener department just can not burn out, just can not take place the accident of insulated wire thunderbolt broken string, has improved the reliability of device. The utility model discloses drainage wire, insulated wire and striking electrode constitute an organic whole, and the stable in structure in service to guaranteed that the distance in protection clearance is stable, avoided the distance in single discharge protection clearance because in service unstable (high-pressure side guard electrode is perpendicular ground towards the earthing pole when newly installing, can change towards the horizontal direction after the operation) inefficacy arouses the trouble emergence of insulated wire thunderbolt broken string. The utility model discloses avoided single protection clearance to suffer from lightning overvoltage at the insulated wire of protection clearance insulator opposite side, can lead to insulating wire to puncture flashover to ground through insulator when lightning overvoltage removes the in-process when not removing the protection clearance when lightning overvoltage is very high to arouse insulated wire's broken string trouble. The utility model discloses do not need to do the experiment in service, only need install according to the construction process requirement strictly, can non-maintaining in the operation process of later stage. The utility model discloses only need on the overhead insulated wire way through puncture fastener one section drainage wire that connects in parallel to be connected the drainage wire with the striking electrode electricity, and install 1 mobilizable telluric electricity field additional, have very conveniently had the installation of the on-line transformation and the new insulating circuit of overhead insulated wire lightning protection, have better usability and economic nature.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of the puncture clamp of the present invention.

Fig. 3 is a schematic structural view of a moving ground electrode according to 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 a ground electrode according to embodiment 2 of the present invention.

Fig. 6 is a side view of a ground electrode according to embodiment 2 of the present invention.

In the figure: 1. the device comprises a grounding electrode, 11, a fixed grounding electrode, 12 a movable grounding electrode, 13, a U-shaped hole, 2, an insulator, 3, an insulated wire, 4, a drainage wire, 5, a puncture wire clamp, 50, a nut, 51, an upper shell, 52, a lower shell, 53, a conducting strip, 54, an insulated wire puncture part, 55, a drainage wire puncture part, 56, a puncture blade, 57, a clamping groove, 58, a clamping body, 59, a bolt, 6, an arc striking electrode, 7 and a movable groove.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Example 1: the bidirectional lightning protection and disconnection protection device for the insulated conductor in the embodiment comprises an earth electrode 1, two insulators 2, an insulated conductor 3, a drainage wire 4, two puncture wire clamps 5 and two arc ignition electrodes 6, as shown in fig. 1 to 3. The grounding electrode comprises a fixed grounding electrode 11 and two movable grounding electrodes 12, wherein one end of each movable grounding electrode is provided with a U-shaped hole 13, and scales are carved on two sides of the U-shaped hole of each movable grounding electrode. The puncture wire clamp comprises an upper shell 51 and a lower shell 52, the upper shell 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 53 to form a conducting loop, the lower shell 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 54, the first drainage wire puncture part and the second drainage wire puncture part correspondingly form a drainage wire puncture part 55, puncture blades 56 are uniformly distributed on the inner walls of the insulated wire puncture part and the drainage wire puncture part, silicone grease is coated on the inner walls of the insulated wire puncture part and the drainage wire puncture part, clamping grooves 57 are formed on two sides of the upper shell, clamping bodies 58 corresponding to the clamping grooves are fixedly mounted on two sides of the lower shell, the card body is integral with the lower shell, and the upper shell and the lower shell are fixed by a connecting fastener, which comprises a bolt 59 and a nut 50. The arc striking electrode, the drainage wire and the puncture wire clamp are all wrapped with insulating wrapping layers except the ground end part of the arc striking electrode, the insulating level of the insulating wrapping layers is consistent with the insulating level of an insulating lead, and the insulating wrapping layers wrapped by the arc striking electrode are red, yellow and green, and are consistent with the A, B, C three-phase colors.

The low-voltage ends of two insulators are fixedly connected with two ends of a fixed grounding electrode, a movable grounding electrode is fixedly connected between the low-voltage end of the insulator and the fixed grounding electrode in a crimping mode, an insulated wire is fixedly installed at the high-voltage end of the insulator, a drainage wire is connected with the insulated wire in parallel through a puncture wire clamp, a puncture blade in a puncture part of the insulated wire penetrates through an insulating layer of the insulated wire to enable the puncture wire clamp to be connected with an electric conductor of the insulated wire, silicone grease on the inner wall of the puncture part of the insulated wire wraps the contact part of the puncture blade and the insulating layer, a puncture blade in the puncture part of the drainage wire penetrates through the insulating layer of the drainage wire to enable the puncture wire clamp to be connected with the electric conductor of the drainage wire, silicone grease on the inner wall of the puncture part of the drainage wire wraps the contact part of the puncture blade and the insulating layer, two ends of the drainage wire are respectively, the working personnel can move the movable grounding electrode to the direction far away from the arc ignition electrode or to the direction close to the arc ignition electrode according to the protection requirement on the site, and further adjust the distance of the discharge protection gap.

A section of drainage wire is parallelly connected with an insulated wire in parallel, two sides of the drainage wire are respectively and electrically connected with an arc-striking electrode, a grounding electrode is fixedly connected to the low-voltage end of an insulator supporting the insulated wire, a discharge protection gap is formed between the arc-striking electrode and the grounding electrode, the distance of the discharge protection gap is adjusted according to the field protection requirement, when the insulated wire is subjected to lightning overvoltage and the amplitude of the lightning overvoltage exceeds the lightning-resistant level of the discharge protection gap, the lightning overvoltage is led to the arc-striking electrode by a puncture wire clamp and the drainage wire, the arc-striking electrode is subjected to breakdown discharge on the grounding electrode, and therefore the insulated wire is protected from being broken. The two sides of the drainage wire are electrically connected with the arc striking electrodes, no matter which side of the insulated wire is struck by lightning, the lightning overvoltage can be caused to the arc striking electrodes nearby through the puncture wire clamps and the drainage wire, the arc striking electrodes are subjected to breakdown discharge on the grounding electrodes, and the reliability of the device is improved. The insulated wire on the other side of the protection gap insulator in the single protection gap is prevented from being subjected to lightning overvoltage, and when the lightning overvoltage is very high, the insulated wire is subjected to breakdown flashover to the ground through the insulator when the insulated wire does not move to the protection gap in the lightning overvoltage moving process, so that the disconnection fault of the insulated wire is caused. The drainage wire, the insulated wire and the arc striking electrode form a whole, and the structure is stable in operation, so that the distance of a protection gap is ensured to be stable, and the fault that the lightning stroke of the insulated wire is broken due to the protection failure caused by the unstable distance of a single discharge protection gap in operation (the high-voltage side protection electrode faces to the grounding electrode vertically when being newly installed and can change towards the horizontal direction after operation) is avoided. As fault current loaded on the insulated conductor (fault current caused by protection gap breakdown due to lightning overvoltage and during three-phase short circuit) can respectively flow into the drainage wire through the 2 puncture wire clamps, the puncture wire clamps can not be blown as long as a single puncture wire clamp can reach a thermal stability value of the fault current of more than 55% (2 puncture wire clamps can be added up to more than 110%), the accident of lightning stroke breakage of the insulated conductor can not occur, and the safety of the insulated conductor is ensured. The thunder and lightning discharge voltage of the discharge protection gap formed between the arc striking electrode and the grounding electrode is smaller than the thunder and lightning flashover voltage of the insulator, when the thunder and lightning overvoltage is suffered, flashover of the insulator can not be caused, and the insulated wire can not be broken, so that the insulator is protected from being broken and the insulated wire is protected from being broken, and damage caused by falling of the insulated wire due to breakage of the insulator and power failure accidents caused by broken of the insulated wire are effectively avoided. According to the protection requirement of the site, the movable grounding electrode can be moved to the direction far away from the arc ignition electrode or to the direction close to the arc ignition electrode, so that the distance of the discharge protection gap is adjusted, and the application range of the protection device is expanded. The movable grounding electrode is fixedly connected with the low-voltage end of the insulator and the fixed grounding electrode, one end of the movable grounding electrode, which is fixedly connected with the low-voltage end of the insulator and the fixed grounding electrode, is provided with a U-shaped hole, the insulator does not need to be taken down when the lightning protection device is additionally arranged on an operating overhead insulated conductor, the insulator can be arranged firstly when the lightning protection device is arranged on a new insulated conductor line, then the nut for fastening the insulator only needs to be loosened, the movable grounding electrode is inserted between the low-voltage end of the insulator and the fixed grounding electrode, then the distance between the movable grounding electrode and an arc-striking electrode is adjusted according; meanwhile, the device only needs to connect a section of drainage wire in parallel through the puncture wire clamp on the overhead insulated line and electrically connect the drainage wire with the arc striking electrode, so that the lightning protection on-line modification of the existing overhead insulated line and the installation on a new overhead insulated line are very convenient, and therefore, the device is convenient to install, safe and reliable, and has better usability and economical efficiency.

Example 2: as shown in fig. 4 to 6, the bidirectional lightning protection device for insulated conductor described in this embodiment has the same structure as that of embodiment 1 except for the grounding electrode. The grounding electrode in the embodiment comprises a fixed grounding electrode and a movable grounding electrode, the contact part of the fixed grounding electrode and the movable grounding electrode is in a trapezoidal table shape, scales are carved on the contact part of the fixed grounding electrode and the movable grounding electrode, a movable groove 7 is formed in the movable grounding electrode, a plurality of bolt holes are formed in two sides of the movable groove respectively, the bolt holes are uniformly formed between the head end and the tail end of the movable groove respectively, the contact surface (the bottom surface of the movable groove) of the movable groove and the fixed grounding electrode is in an arc shape, and the side surface of the contact part of the fixed grounding electrode and the movable grounding electrode is connected with the side surface of the movable groove through bolts, so that the fixed connection of the fixed.

The staff can move the ground electrode to the direction of keeping away from the arc ignition electrode or to the direction of being close to the arc ignition electrode according to the protection requirement on the scene, and after moving to the assigned position, screw up the bolt for fixed ground electrode and removal ground electrode fixed connection reach the distance of adjustment discharge protection clearance.

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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