CN215452049U - Novel combined arc extinguishing lightning protection device - Google Patents

Abstract

The utility model discloses a novel combined arc-extinguishing lightning-protection device, which belongs to the technical field of lightning-protection arc extinguishing and comprises an end arc-extinguishing unit, a sealed arc-extinguishing unit and an insulator string, wherein the sealed arc-extinguishing unit is arranged on the insulator string in parallel, the end arc-extinguishing unit is arranged at the upper end or the lower end of the insulator string and is electrically connected with a metal piece at the end part of the insulator string, when the end arc-extinguishing unit is arranged at the upper end of the insulator string, the bottom of the insulator string is grounded, and when the end arc-extinguishing unit is arranged at the bottom of the insulator string, the bottom of the end arc-extinguishing unit is grounded. The utility model has strong arc extinguishing integrity, can not be re-ignited, the electric arc is integrally and simultaneously cut off, and is not cut off in sections, and the medium recovery speed tends to be infinite, thereby reaching the self limit, so the arc extinguishing speed is rapid, and the re-ignition can not occur.

Description

Novel combined arc extinguishing lightning protection device

Technical Field

The utility model relates to the field, in particular to a novel combined arc extinguishing lightning protection device.

Background

Lightning strikes can cause damage and destruction of electrical facilities in different forms, and thundercloud discharge can cause lightning strike overvoltage in an electrical power system. Lightning overvoltage can damage insulators and power transmission lines; the line insulator flashover is caused by impact flashover caused by lightning strike on the transmission line, and then a large power frequency current is generated to damage the insulator string and hardware fittings, so that line accidents are caused; the lightning strikes on the power transmission line or the lightning conductor, which may cause strand breakage or even breakage, and the power transmission work cannot be carried out.

The existing lightning protection arc extinguishing device can enable the volt-second characteristic of an active arc extinguishing parallel gap to be more flat, but the existing lightning protection arc extinguishing device only can reduce the steepness of a wave head of lightning current, can not thoroughly prevent insulator flashover, has limited lightning current attenuation capability, and can not reach ideal standards in carbon emission.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a novel combined arc-extinguishing lightning-protection device, which solves the technical problems of limited capability of the amplitude of the attenuation lightning current for lightning-protection arc-extinguishing and low arc-extinguishing speed. The arc extinguishing rate is improved, insulator flashover is prevented, the lightning accident rate and the trip rate are reduced, the operation stability of a power grid is improved, and the response reaches the national major requirement standard of carbon peak reaching and carbon neutralization.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a novel combination arc extinguishing lightning protection device, includes tip arc extinguishing unit, sealed arc extinguishing unit and insulator chain, and sealed arc extinguishing unit connects in parallel and sets up on insulator chain, and tip arc extinguishing unit sets up the upper end or the lower extreme at insulator chain to with insulator chain tip metalwork electric connection, when tip arc extinguishing unit sets up in insulator chain upper end, insulator chain bottom ground connection, when tip arc extinguishing unit sets up the bottom at insulator chain, the bottom ground connection setting of tip arc extinguishing unit.

Further, tip arc extinguishing unit and sealed arc extinguishing unit all set up to a sealed tube, and the sealed tube both ends set up electrode and lower electrode seal respectively and set up, are provided with insulating oil in the sealed tube, and the side of sealed tube is provided with the shirt rim.

Further, the sealing tube further comprises a ceramic tube and a protective shell, the protective shell is arranged on the outer side of the ceramic tube, and the skirt edge is arranged on the outer side of the protective shell.

Further, the upper electrode comprises an upper graphite electrode, a middle metal electrode and a lower graphite electrode, the middle metal electrode is fixed at one end of the ceramic tube and one end of the protective shell, the upper graphite electrode is arranged on the upper layer of the middle metal electrode, the lower graphite electrode is arranged at the bottom of the middle metal electrode and is arranged in the ceramic tube, the lower electrode comprises an upper graphite electrode and a bottom metal electrode, the bottom metal electrode is fixed at the other end of the ceramic tube and the other end of the protective shell, and the upper graphite electrode is arranged in the ceramic tube and is connected with the bottom metal electrode.

Further, tip arc extinguishing unit and sealed arc extinguishing unit all set up to a sealed tube, and the sealed tube both ends set up electrode and lower electrode seal respectively and set up, are provided with insulating oil in the sealed tube, and the side of sealed tube is provided with the shirt rim, and the inboard edge of sealed tube is provided with the arc extinguishing bars at the interval, and the arc extinguishing bars lateral length is greater than the half internal diameter of sealed tube.

Furthermore, the bottom of the upper electrode is provided with an upper tip electrode, the upper end of the lower electrode is provided with a lower tip electrode, the upper tip electrode and the lower tip electrode are arranged vertically relatively, and the upper tip electrode and the lower tip electrode are graphite electrodes.

Further, the arc extinguishing bars are made of insulating materials, the arc extinguishing bars are arranged into semicircular structures, the arc extinguishing bars arranged on the inner side walls of the two semicircles in the sealing tube are arranged alternately, convex piers are arranged between the arc extinguishing bars on the same semicircle, and the convex piers on the inner side wall of one semicircle are arranged opposite to the arc extinguishing bars on the inner side wall of the other semicircle.

The specific working process of the lightning protection device is as follows:

step 1: when a tower or a transmission line is struck by lightning, the fully-sealed liquid arrester discharges before the insulator string, and a lightning arc is poured into an insulating tube in the arrester;

step 2: when arc discharge is initiated in the sealed tube filled with insulating oil, the electrohydraulic effect generates shock waves which impact to the side edges. Arc discharge is initiated in the ceramic tube filled with insulating oil, part of the insulating oil in the discharge channel is instantly vaporized, decomposed and ionized into high-temperature plasma and suddenly expands to form a mechanical pressure wave which is rapidly transmitted outwards, but the liquid can be regarded as a shock wave transmission medium which can not be compressed, so that when the discharge channel is subjected to liquid-phase discharge, a mechanical effect of power is shown to the outside, an acting force which impacts the ceramic tube wall is formed in the ceramic tube, due to the force interactivity, the ceramic tube wall generates shock waves in the insulating oil medium, meanwhile, the pressure peak time point is the same as the pre-breakdown time point, no matter impact or power frequency flashover, the maximum time of the change rate is the pre-breakdown time, the maximum change rate necessarily generates the maximum change rate of the occupied volume of the electric arc, and meanwhile, the liquid has the characteristic of not allowing the electric arc to occupy the space due to incompressibility, therefore, a pressure peak value is generated, at the moment, the arc current is extremely weak, the arc anti-interruption pressure is extremely small, the advantage of asymmetrical arc extinguishing pressure is formed, in addition, an intermittent discharge mode is generated, frequent arc extinguishing and frequent re-ignition mechanisms are adopted, the arc intensity is restrained from prolonging the arc duration, the discharge intensity and the steepness are simultaneously and greatly attenuated, and the energy release intensity is reduced through destruction.

And step 3: the Pascal effect enhances the liquid electric effect, when electric arc acts on the insulating oil, when a certain part of static insulating oil generates pressure intensity change, the electric arc is constantly transmitted to all directions of the inner side of the sealing pipe. When an impact electric arc acts on the metal electrode to apply pressure to the insulating oil in the ceramic tube, according to the Pascal principle, a certain part of static fluid in the closed container generates pressure change, the pressure is constantly transmitted to all directions, and then the insulating oil medium around is impacted by a larger acting force from a discharge channel in the ceramic tube, and the acting force rebounds after contacting the wall of the ceramic tube.

And 4, step 4: because the arc extinguishing bars are arranged in the sealed tube, the length of the electric arc in the sealed tube is prolonged, the convex piers are arranged to increase the surface area of the sealed tube, the impact waves of the liquid-electric effect and the Pascal effect return to the side edge and impact the side edge, the impact arc extinguishing is intensively carried out on the electric arc channel, two points on one electric arc carry out the arc extinguishing, an intermittent discharge mode is generated, the breakdown volt-second characteristic becomes gentle, the breakdown starting voltage is reduced, and the residual voltage value is also reduced.

The hydro-electric effect and the Pascal effect enable the pressure in the ceramic tube to be increased, the temperature to be increased, acting force pointing to the center from the ceramic tube wall is generated, under the acting force, the electric arc moves towards the tip end of the arc-extinguishing grid, the tip end lengthens the length of the electric arc, under the condition that insulating oil blows the electric arc, the temperature of the electric arc is reduced, the electric arc is extinguished more quickly, the longer the electric arc formed in the ceramic tube is, the acting force on the ceramic tube wall is larger, the larger the impact force for cutting off the electric arc is, the action force rebounds after acting on the shell, the acting force pointing to the center of the insulating tube is formed, the medium generates polarized current in an impact pre-breakdown stage, the breakdown voltage is reduced, the breakdown voltage value corresponding to a short time period is reduced, the breakdown volt-second characteristic corresponding to the medium is enabled to be gentle, frequent arc extinguishing and frequent reignition mechanisms are adopted, the electric arc intensity is inhibited from being lengthened for the duration time, the discharge intensity and the steepness are simultaneously greatly attenuated, and the destruction energy release intensity is reduced.

Coulomb force generation pressure: the lightning current will generate an induced arc before breaking down the gap, forming an induced charge chain. The induction charge chain in the air is composed of a plurality of homopolar charges, and a large coulomb force can be generated due to the interaction of the homopolar charges, namely, the induction arc generates the coulomb force of opposite attraction outwards, and the coulomb force ensures that the arc smoothly enters the arc extinguishing device. In the sealed space of the insulating tube, the effect of coulomb force is expressed as the pressure breaking effect on the electric arc and the extrusion on the liquid, and the liquid filled in the insulating tube is not compressed, so the pressure in the sealed space is increased continuously. Along with the continuous increase of the pressure, the temperature is also continuously increased, so that the movement speed of the charges is increased, and larger pressure and pressure are generated, and the pressure is used for storing energy for breaking and extinguishing the electric arc. The insulating oil is a strong polarization medium, and polarization current can be generated in the impact pre-breakdown stage, so that the breakdown voltage is reduced, namely, the breakdown voltage value corresponding to a short time period is reduced, the breakdown volt-second characteristic corresponding to the insulating oil medium is smoothed, and the breakdown initial voltage is reduced while the residual voltage value is reduced.

The liquid electric effect generates shock waves: after the electric arc enters the sealed pipeline, the electric arc is discharged in the insulating tube filled with liquid medium, part of liquid in the discharge channel is instantaneously vaporized, decomposed and ionized into high-temperature plasma and suddenly expanded, the volume of the expanded gas is 1800 times that of the liquid, and a mechanical pressure wave which rapidly spreads outwards is formed. However, the liquid can be regarded as a shock wave transmission medium which can not be compressed, and the action of the electric arc on the occupying pressure of the liquid is added, so that when the liquid-phase discharge is carried out on the discharge channel, an ultrahigh-power mechanical effect is shown to the outside. The acting force impacting the inner wall of the pipeline is formed in the insulating pipe, and due to the interaction of the force, the pipe wall of the insulating pipe generates strong shock waves in a liquid medium, the strong shock waves act on a discharge channel in an impulse or shock pressure mode, and electric arcs are instantly and integrally pressed off and extinguished. When the electric arc is extinguished, the gap space is equivalently emptied in the channel, and because the medium recovery speed tends to be infinite and the medium strength is very high, the medium recovers instantaneously in a full scale and becomes dielectric from conductivity. The pressure peak time is at the pre-breakdown time. No matter impact or power frequency flashover, the maximum time of the change rate is the pre-breakdown time, the maximum change rate inevitably generates the maximum change rate of the occupied volume of the electric arc, and meanwhile, the liquid has the characteristic of incompressibility to generate the situation that the electric arc is not occupied, so that the pressure peak value is generated. At the moment, the arc current is extremely weak, the arc breaking pressure resistance is extremely low, and the advantage of asymmetric arc extinguishing pressure is formed.

In addition, the ability to rapidly extinguish arcs creates an intermittent discharge mode. The frequent arc extinguishing and frequent reignition mechanism inhibits the electric arc intensity from prolonging the electric arc duration time, greatly attenuates the discharge intensity and the steepness simultaneously, and ensures the safety, the durability and the reliability of the lightning protection device by reducing the destructive energy release intensity.

The pascal effect further enhances the coulomb force and the hydroelectric effect: the pascal principle means: after any point in the incompressible static fluid is subjected to pressure increment generated by external force, the pressure increment is instantly transmitted to each point of the static fluid, namely, the pressure intensity is equal to the action pressure divided by the force-bearing area.

Coulomb force between charges and impact electric arc act on the metal electrode, and certain pressure is applied to the liquid medium in the insulating tube. According to the pascal principle, a pressure change occurring in a certain portion of the stationary fluid in the closed vessel will be transmitted in all directions with a constant magnitude. Then, the liquid medium around is impacted by a larger acting force from the discharge channel in the insulating tube, the acting force rebounds after contacting the wall of the insulating tube to form an acting force with the direction pointing to the center of the insulating tube, so that the impact pressure generated in coulomb force and liquid-electricity effect is further enhanced, and the effect of the action of the double pressure sources is amplified together to achieve the purpose of cutting off the electric arc. And the longer the arc in the insulating tube, the greater the force on the insulating tube wall and, in turn, the greater the impact pressure to break the arc.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

(1) the utility model has strong arc extinguishing integrity, can not be re-ignited, the electric arc is integrally and simultaneously cut off, and is not cut off in sections, and the medium recovery speed tends to be infinite, thereby reaching the self limit, so the arc extinguishing speed is rapid, and the re-ignition can not occur.

(2) The electric arc is cut off rapidly, and the electric arc enters the insulating tube through the conducting electrode, and the heat transferred to the liquid medium is very low, so that the temperature rise rate of the liquid medium is greatly reduced, and the probability of thermal breakdown of the medium is greatly reduced. Under the condition of multi-pulse lightning stroke, large electric arc energy cannot be injected into a medium due to the characteristic, so that the structure of the device is protected from being damaged, the reliability of the device is greatly improved, and the possibility of damaging the structure caused by the heat accumulation effect of the multi-pulse lightning stroke is blocked. The discharge of the arc in the liquid produces a liquid-electric effect, rapidly forming a shock pressure wave, the shock arc being immediately interrupted just as it was formed.

(3) The residual voltage is very low, the arc discharges through the pipeline, the initial value of the breakdown voltage at the beginning is reduced due to the distance between the upper conducting electrode and the lower conducting electrode, once the breakdown occurs, the voltage is rapidly reduced to the arc voltage drop, and therefore the residual voltage is very low. Meanwhile, the insulating oil is a strong polarization medium, and polarization current can be generated in the impact pre-breakdown stage, so that the breakdown voltage is reduced, namely, the breakdown voltage value corresponding to a short time period is reduced, the breakdown volt-second characteristic corresponding to the insulating oil medium is smoothed, and the residual voltage value is reduced while the breakdown starting voltage is reduced.

(4) The direct lightning overvoltage can be effectively protected, and when a pilot channel of lightning discharge hits a lead wire, a tower or other buildings of a power transmission line, the overvoltage amplitude can be reduced and the discharge time can be prolonged by the arc extinguishing method based on the Pascal principle. The damage of direct lightning overvoltage to equipment and devices is avoided.

(5) The device is prevented from being damaged by electromagnetic induction overvoltage, transient strong electromagnetic fields are generated in the surrounding space of a discharge channel in the lightning stroke discharge process, higher electromagnetic induction electromotive force is generated to interfere a signal line, and even instrument and equipment are damaged. The arc extinguishing method based on the Pascal principle cuts off the electric arc through the recoil acting force, thereby not only delaying the discharge time of the electric arc, but also reducing the gradient of the lightning wave. The damage of the induced electromagnetic overvoltage to power electronic components, communication signals and the like is avoided.

(6) The environment-friendly economical efficiency is good, the liquid medium replaces the prior valve plate, the traditional lightning arrester is produced by smelting and sintering, the process requirement is quite strict, the repeated sintering causes a large amount of carbon emission, and the combined device can greatly reduce the carbon emission content and meet the national important requirement standard of carbon peak reaching and carbon neutralization. In addition, the device has simple production structure and good economical efficiency.

Drawings

FIG. 1 is a schematic diagram of a first apparatus according to the present invention;

FIG. 2 is a schematic structural diagram of a second apparatus of the present invention;

FIG. 3 is a schematic diagram of a first sealed arc extinguishing unit according to the present invention;

fig. 4 is a schematic structural diagram of a second sealed arc extinguishing unit according to the utility model.

In the drawing, A is an end arc extinguishing unit, B is a sealed arc extinguishing unit, C is an insulator string, D is a grounding wire, 1 is an upper electrode, 2 is insulating oil, 3 is a ceramic tube, 4 is a skirt, 5 is a protective shell, 6 is a lower electrode, 7 is an electric arc, 8 is an upper tip electrode, 9 is an arc chute, 10 is a convex pier, and 11 is a lower tip electrode.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

Example 1:

as shown in fig. 1 and fig. 3-4, a novel combined arc extinguishing lightning protection device comprises an end arc extinguishing unit A, a sealed arc extinguishing unit B and an insulator string C, wherein the sealed arc extinguishing unit B is arranged on the insulator string C in parallel, the end arc extinguishing unit A is arranged at the upper end of the insulator string C and is electrically connected with a metal piece at the end of the insulator string C, and the bottom of the insulator string C is grounded. The arc enters from one end of the series insulator arrangement and the basic arc is at this stage completely interrupted and does not re-ignite. If the arc is not completely cut off after the arc extinction at the stage, the arc can be completely cut off through the parallel connection device with the insulator string, and the residual arc energy enters the ground through the grounding channel of the conducting electrode, so that the safety of the insulator is greatly protected.

In this embodiment, the end arc extinguishing unit a and the sealed arc extinguishing unit B are both configured as a sealed tube, the upper electrode 1 and the lower electrode 6 are respectively disposed at two ends of the sealed tube, the insulating oil 2 is disposed in the sealed tube, and the skirt 4 is disposed at a side edge of the sealed tube. The sealing tube further comprises a ceramic tube 3 and a protective shell 5, wherein the protective shell 5 is arranged on the outer side of the ceramic tube 3, and the skirt edge 4 is arranged on the outer side of the protective shell 5.

The upper electrode 1 includes upper graphite electrode, middle metal electrode and lower floor's graphite electrode, middle metal electrode fixes the one end at ceramic pipe 3 and protecting sheathing 5, upper graphite electrode sets up the upper strata at middle metal electrode, lower floor's graphite electrode sets up the bottom at middle metal electrode, and set up in ceramic pipe 3, lower electrode 6 includes upper end graphite electrode and bottom metal electrode, the other end at ceramic pipe 3 and protecting sheathing 5 is fixed to bottom metal electrode, upper end graphite electrode sets up in ceramic pipe 3, and be connected with bottom metal electrode.

The insulating tube filled with insulating oil is made of high-hardness high-temperature-resistant high-pressure-resistant inorganic non-metallic materials and is cylindrical; the insulating tube is tightly connected with the composite insulator, and plays a role in fixing the insulating tube and the umbrella skirt; the closed space in the insulating tube is filled with insulating oil and is the area where the electric arc collides elastically.

When a tower or a transmission line is struck by lightning, the fully-sealed liquid arrester discharges before an insulator string, a lightning arc is poured into an insulating tube in the arrester to generate a liquid-electric effect, a strong shock wave is formed, and the strong shock wave acts on a discharge channel in an impulse or shock pressure mode to cut off the arc. Meanwhile, when the electric arc enters the insulating tube, a certain pressure is applied to the liquid in the insulating tube, and according to the Pascal principle, the pressure change of a certain part of the static fluid in the closed container is constantly transmitted to all directions, so that a larger acting force is inevitably generated on the inner wall of the insulating tube. The acting force rebounds after acting on the shell to form an acting force with the direction pointing to the center of the insulating tube, so that the aim of cutting off the electric arc is fulfilled.

The graphite electrode is arranged at the lightning receiving place, so that the service life can be effectively prolonged. The graphite electrode has good conductivity, and is easy to introduce electric arc into the recoil pipe: graphite is a non-metallic material, and the conductivity of graphite is 100 times higher than that of general non-metallic ore. Graphite is an electrical conductor in that the periphery of each carbon atom in graphite is linked to three other carbon atoms arranged in a honeycomb pattern of many hexagons, and since each carbon atom gives off an electron, those electrons are free to move. Generally, the electrical discharge machining speed of the graphite electrode is 1.5 to 2 times faster than that of the copper electrode as a whole. When the power transmission line is struck by lightning, the graphite electrode can play a role in striking arcs, so that the arcs can smoothly enter the arc extinguishing pipe.

The graphite electrode has extremely high melting point, can bear larger current and is not easy to deform: graphite electrodes have the property of being able to withstand high current conditions. The softening point of copper is about 1000 ℃, and the copper is easy to deform due to heating; and the sublimation temperature of the graphite is about 3650 ℃. Lightning strike currents of between 5000 amperes and 5 kiloamperes, producing lightning strike temperatures of up to 3000 degrees. Therefore, the metal electrode is easy to deform under the action of lightning strike heavy current, generates metal powder, splashes, damages the structure of the arc extinguish chamber and influences the effect of recoil arc extinction, and the graphite electrode can effectively solve the problems.

The loss of the graphite electrode is small: the graphite electrode has the characteristic of bearing a large current condition, a polarity effect is generated under the action of lightning arcs, partial corrosion removal objects and carbon particles can be adhered to the surface of the electrode to form a protective layer, and the graphite electrode is ensured to have extremely low loss or even zero loss in the process of recoil arc extinguishing.

As shown in fig. 4, the structure is different from the above structure, the end arc extinguishing unit a and the sealed arc extinguishing unit B are both arranged as a sealed tube, the two ends of the sealed tube are respectively provided with an upper electrode 1 and a lower electrode 6 which are sealed, the sealed tube is internally provided with insulating oil 2, the side edge of the sealed tube is provided with a skirt 4, the inner side edge of the sealed tube is provided with arc extinguishing grids 9 at intervals, and the transverse length of the arc extinguishing grids 9 is larger than one-half of the inner diameter of the sealed tube. The bottom of the upper electrode 1 is provided with an upper tip electrode 8, the upper end of the lower electrode 6 is provided with a lower tip electrode 11, the upper tip electrode 8 and the lower tip electrode 11 are arranged vertically relatively, and the upper tip electrode 8 and the lower tip electrode 11 are both graphite electrodes.

In this embodiment, the arc-extinguishing bars 9 are made of insulating materials, the arc-extinguishing bars 9 are arranged in a semicircular structure, the arc-extinguishing bars 9 arranged on the inner side walls of the two semicircles in the sealed tube are arranged alternately, the convex piers 9 are arranged between the arc-extinguishing bars 9 on the same semicircle, and the convex piers 9 on the inner side wall of one semicircle are arranged opposite to the arc-extinguishing bars 9 on the inner side wall of the other semicircle.

The hydro-electric effect and the Pascal effect enable the pressure in the ceramic tube to be increased, the temperature to be increased, acting force pointing to the center from the wall of the ceramic tube is generated, under the acting force, the electric arc moves towards the tip of the arc-extinguishing grid, the tip lengthens the length of the electric arc, and under the condition that insulating oil blows the electric arc, the temperature of the electric arc is reduced, so that the electric arc is extinguished more quickly, the longer the electric arc formed in the ceramic tube is, the greater the acting force on the wall of the ceramic tube is, and the greater the impact force for cutting off the electric arc is, and arc extinction is completed.

The specific working process of the lightning protection device is as follows:

step 1: when the tower or the transmission line is struck by lightning, the fully-sealed liquid arrester discharges before the insulator string, and the lightning arc is poured into the insulating tube in the arrester.

Step 2: when arc discharge is initiated in the sealed tube filled with insulating oil, the electrohydraulic effect generates shock waves which impact to the side edges. Arc discharge is initiated in the ceramic tube filled with insulating oil, part of the insulating oil in the discharge channel is instantly vaporized, decomposed and ionized into high-temperature plasma and suddenly expands to form a mechanical pressure wave which is rapidly transmitted outwards, but the liquid can be regarded as a shock wave transmission medium which can not be compressed, so that when the discharge channel is subjected to liquid-phase discharge, a mechanical effect of power is shown to the outside, an acting force which impacts the ceramic tube wall is formed in the ceramic tube, due to the force interactivity, the ceramic tube wall generates shock waves in the insulating oil medium, meanwhile, the pressure peak time point is the same as the pre-breakdown time point, no matter impact or power frequency flashover, the maximum time of the change rate is the pre-breakdown time, the maximum change rate necessarily generates the maximum change rate of the occupied volume of the electric arc, and meanwhile, the liquid has the characteristic of not allowing the electric arc to occupy the space due to incompressibility, therefore, a pressure peak value is generated, at the moment, the arc current is extremely weak, the arc anti-interruption pressure is extremely small, the advantage of asymmetrical arc extinguishing pressure is formed, in addition, an intermittent discharge mode is generated, frequent arc extinguishing and frequent re-ignition mechanisms are adopted, the arc intensity is restrained from prolonging the arc duration, the discharge intensity and the steepness are simultaneously and greatly attenuated, and the energy release intensity is reduced through destruction.

And step 3: the Pascal effect enhances the liquid electric effect, when electric arc acts on the insulating oil, when a certain part of static insulating oil generates pressure intensity change, the electric arc is constantly transmitted to all directions of the inner side of the sealing pipe. When an impact electric arc acts on the metal electrode to apply pressure to the insulating oil in the ceramic tube, according to the Pascal principle, a certain part of static fluid in the closed container generates pressure change, the pressure is constantly transmitted to all directions, and then the insulating oil medium around is impacted by a larger acting force from a discharge channel in the ceramic tube, and the acting force rebounds after contacting the wall of the ceramic tube.

And 4, step 4: because the arc extinguishing bars are arranged in the sealed tube, the length of the electric arc in the sealed tube is prolonged, the convex piers are arranged to increase the surface area of the sealed tube, the impact waves of the liquid-electric effect and the Pascal effect return to the side edge and impact the side edge, the impact arc extinguishing is intensively carried out on the electric arc channel, two points on one electric arc carry out the arc extinguishing, an intermittent discharge mode is generated, the breakdown volt-second characteristic becomes gentle, the breakdown starting voltage is reduced, and the residual voltage value is also reduced.

The hydro-electric effect and the Pascal effect enable the pressure in the ceramic tube to be increased, the temperature to be increased, acting force pointing to the center from the ceramic tube wall is generated, under the acting force, the electric arc moves towards the tip end of the arc-extinguishing grid, the tip end lengthens the length of the electric arc, under the condition that insulating oil blows the electric arc, the temperature of the electric arc is reduced, the electric arc is extinguished more quickly, the longer the electric arc formed in the ceramic tube is, the acting force on the ceramic tube wall is larger, the larger the impact force for cutting off the electric arc is, the action force rebounds after acting on the shell, the acting force pointing to the center of the insulating tube is formed, the medium generates polarized current in an impact pre-breakdown stage, the breakdown voltage is reduced, the breakdown voltage value corresponding to a short time period is reduced, the breakdown volt-second characteristic corresponding to the medium is enabled to be gentle, frequent arc extinguishing and frequent reignition mechanisms are adopted, the electric arc intensity is inhibited from being lengthened for the duration time, the discharge intensity and the steepness are simultaneously greatly attenuated, and the destruction energy release intensity is reduced.

Example 2:

as shown in fig. 2, this embodiment is different from embodiment 1 in that the end arc-extinguishing unit a is installed at the bottom of the insulator string C, while the bottom of the end arc-extinguishing unit a is directly grounded, and then the top of the end arc-extinguishing unit a is also connected to one end of the sealed arc-extinguishing unit B. When the electric shock is similar, lightning strike electric arcs firstly pass through the sealed arc extinguishing unit B from the top of the insulator string C and then reach the end arc extinguishing unit A, so that two breakdown is realized, two arc extinguishments are realized, and two points on one channel are simultaneously extinguished.

Lightning current strikes on the circuit, and liquid arc control device passes through insulating cooperation and introduces electric arc wherein, has avoided electric arc to make its flashover through the insulator, through the combination arc extinguishing of series-parallel connection, and the arc extinguishing is high-efficient rapidly, very big protection transmission line and insulator safety.

The liquid arc extinguishing lightning protection device umbrella skirt introduced above can also be removed, and the liquid arc extinguishing lightning protection device umbrella skirt is divided into two types, namely the umbrella skirt is removed and the umbrella skirt is reserved. The umbrella skirt is removed, so that the flashover distance is further shortened, the external flashover distance is smaller than the internal flashover distance, electric arcs are guided to smoothly enter the arc extinguishing pipeline, and the safety of the power transmission line and the insulator is further guaranteed.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims (6)

1. The utility model provides a novel combination arc extinguishing lightning protection device which characterized in that: including tip arc extinguishing unit (A), sealed arc extinguishing unit (B) and insulator chain (C), sealed arc extinguishing unit (B) connects in parallel and sets up on insulator chain (C), tip arc extinguishing unit (A) sets up the upper end or the lower extreme at insulator chain (C), and with insulator chain (C) tip metalwork electric connection, when tip arc extinguishing unit (A) sets up when insulator chain (C) upper end, insulator chain (C) bottom ground connection, when tip arc extinguishing unit (A) sets up the bottom at insulator chain (C), the bottom ground connection setting of tip arc extinguishing unit (A).

2. A novel combined arc extinguishing lightning protection device according to claim 1, characterized in that: tip arc extinguishing unit (A) and sealed arc extinguishing unit (B) all set up to a sealed tube, and the sealed tube both ends set up electrode (1) and lower electrode (6) sealed setting respectively, are provided with insulating oil (2) in the sealed tube, and the side of sealed tube is provided with shirt rim (4), and the sealed tube still includes ceramic tube (3) and protecting sheathing (5), and protecting sheathing (5) set up in the outside of ceramic tube (3), and shirt rim (4) set up in the outside of protecting sheathing (5).

3. A novel combined arc extinguishing lightning protection device according to claim 2, characterized in that: upper electrode (1) includes upper graphite electrode, middle metal electrode and lower floor's graphite electrode, middle metal electrode fixes the one end at ceramic pipe (3) and protecting sheathing (5), upper graphite electrode sets up the upper strata at middle metal electrode, lower floor's graphite electrode sets up the bottom at middle metal electrode, and set up in ceramic pipe (3), lower electrode (6) are including upper end graphite electrode and bottom metal electrode, the other end at ceramic pipe (3) and protecting sheathing (5) is fixed to bottom metal electrode, upper end graphite electrode sets up in ceramic pipe (3), and be connected with bottom metal electrode.

4. A novel combined arc extinguishing lightning protection device according to claim 1, characterized in that: tip arc extinguishing unit (A) and sealed arc extinguishing unit (B) all set up to a sealed tube, and the sealed tube both ends set up electrode (1) and lower electrode (6) sealed setting respectively, are provided with insulating oil (2) in the sealed tube, and the side of sealed tube is provided with shirt rim (4), and the inboard edge of sealed tube is gone up the interval and is provided with arc extinguishing bars (9), and arc extinguishing bars (9) horizontal length is greater than the half internal diameter of sealed tube.

5. A novel combined arc extinguishing lightning protection device according to claim 4, characterized in that: the bottom of the upper electrode (1) is provided with an upper tip electrode (8), the upper end of the lower electrode (6) is provided with a lower tip electrode (11), the upper tip electrode (8) and the lower tip electrode (11) are vertically arranged relatively, and the upper tip electrode (8) and the lower tip electrode (11) are graphite electrodes.

6. A novel combined arc extinguishing lightning protection device according to claim 5, characterized in that: arc extinguishing bars (9) are made by insulating material, and arc extinguishing bars (9) set up to semicircular structure, and arc extinguishing bars (9) that two semicircle inside walls set up in the sealed tube set up alternately, are provided with protruding mound (10) between arc extinguishing bars (9) on the same semicircle, and protruding mound (10) of a semicircle inside wall set up with arc extinguishing bars (9) of another semicircle inside wall relatively.

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