CN219144713U - Combined liquid-electricity effect arc extinguishing device - Google Patents

Abstract

The utility model provides a combined liquid electric effect arc-extinguishing device, which belongs to the technical field of lightning protection and arc extinguishing, and comprises an insulator string, wherein an upper hardware fitting and a lower hardware fitting are respectively arranged at the upper end and the lower end of the insulator string, two combined arc-extinguishing devices or one combined arc-extinguishing device and an electrode are also included, if the combined arc-extinguishing device is included, one combined arc-extinguishing device is arranged at the lower end of the upper hardware fitting, the other combined arc-extinguishing device is arranged at the upper end of the lower hardware fitting, if the combined arc-extinguishing device and the electrode are included, one combined arc-extinguishing device is arranged at the lower end of the upper hardware fitting, the electrode is arranged at the upper end of the lower hardware fitting, the insulation degree between the upper hardware fitting and the lower hardware fitting is greater than or equal to that of the insulator string, and a pre-ionization discharge device is arranged on the combined arc-extinguishing device. The combined structure of the totally-enclosed liquid-electricity arc-extinguishing chamber and the open liquid-electricity arc-extinguishing chamber can increase the space dimension of the liquid-electricity arc-extinguishing chamber after rainwater is poured into the open arc-extinguishing chamber, and enhance the arc-extinguishing capability.

Description

Combined liquid-electricity effect arc extinguishing device

Technical Field

The utility model relates to the technical field of lightning protection and arc extinction, in particular to a combined liquid-electricity effect arc extinction device.

Background

Lightning is a common discharge phenomenon in nature, and huge energy released by lightning strike has serious harm to buildings and high-altitude objects. Lightning strikes can cause different forms of damage and destruction to electrical facilities, and lightning strike overvoltage can be caused by thundercloud discharge in an electrical power system. The lightning overvoltage can damage the insulator and the transmission line; impact flashover caused when the transmission line is struck by lightning causes flashover of the line insulator, so that large power frequency freewheel is generated, the insulator string and the hardware fitting are damaged, and line accidents are caused; lightning strikes on a transmission line or a lightning conductor, which may cause strand breakage or even breakage, so that transmission work cannot be performed.

The current arc extinguishing device can effectively reduce lightning current, so that the volt-second characteristic of an active arc extinguishing parallel gap becomes flatter, but the current arc extinguishing device can only reduce the wave head steepness of lightning current, cannot further attenuate the amplitude of the lightning current, cannot achieve the aim of greatly reducing lightning trip, and has limited lightning current attenuation capability.

Disclosure of Invention

The utility model aims to provide a combined liquid-electricity effect arc extinguishing device which solves the technical problems in the background technology. The device adopts liquid arc extinction, is low-carbon and environment-friendly, and meets the national peak-to-peak and carbon neutralization important requirements.

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

the utility model provides a combination liquid electric effect arc extinguishing device, includes the insulator chain, and the upper and lower both ends of insulator chain are provided with fitting and lower fitting respectively, its characterized in that: the combined arc extinguishing device is arranged at the lower end of the upper hardware fitting, and the combined arc extinguishing device is arranged at the upper end of the lower hardware fitting if the combined arc extinguishing device comprises the two combined arc extinguishing devices or the electrode.

The combined arc-extinguishing device comprises a recoil tube device and a sealed liquid-electricity arc-extinguishing tube, wherein the recoil tube device is arranged at the upper end of the sealed liquid-electricity arc-extinguishing tube, the bottom of the recoil tube device is communicated with the upper end of the sealed liquid-electricity arc-extinguishing tube through a conductive dielectric body, and skirt edges are arranged on the outsides of the recoil tube device and the sealed liquid-electricity arc-extinguishing tube.

Further, the sealed liquid electricity arc extinguishing tube comprises an upper sealing plate, a sealed tube body, a liquid medium and a lower sealing plate, wherein the upper sealing plate and the lower sealing plate are arranged at two ends of the sealed tube body in a sealing mode, the liquid medium is arranged in the sealed tube body, and the upper sealing plate and the lower sealing plate are both metal plates.

Further, an elastic layer is arranged on the inner wall of the sealing tube body, and the elastic layer is arranged between the inner wall of the sealing tube body and the liquid medium.

Further, the sealed liquid electric arc extinguishing tube further comprises an upper vertical electrode and a lower vertical electrode, wherein the upper vertical electrode penetrates through the upper sealing plate to be sealed, and the lower vertical electrode penetrates through the lower sealing plate to be sealed.

Further, the recoil tube device comprises a recoil tube body and an arc striking electrode, wherein the recoil tube body is of a hollow tube structure with an opening at the upper end, and the arc striking electrode is arranged at the top of the recoil tube body.

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

the combined structure of the fully-closed liquid-electric arc extinguishing chamber and the open liquid-electric arc extinguishing chamber can increase the space dimension of the liquid-electric arc extinguishing chamber after rainwater is poured into the open arc extinguishing chamber, enhance the arc extinguishing capability, form the gas-electric effect arc extinguishing chamber under the condition of no rainwater, and also can generate the superposition strengthening effect of arc extinguishing.

Drawings

Fig. 1 is a schematic diagram of an arc extinguishing system according to the present utility model;

fig. 2 is a schematic structural view of the combined arc extinguishing device of the present utility model.

In the attached drawings, a 1-recoil tube device, a 2-sealed liquid electric arc extinguishing tube, a 3-striking electrode, a 4-recoil tube body, a 5-skirt, a 6-upper sealing plate, a 7-upper vertical electrode, an 8-sealed tube body, a 9-elastic layer, a 10-liquid medium, a 11-lower sealing plate, a 12-lower vertical electrode, a 13-lower insulating plate, a 14-insulator string, a 15-upper hardware fitting, a 16-combined arc extinguishing device and a 17-lower hardware fitting are arranged.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the utility model, and that these aspects of the utility model may be practiced without these specific details.

As shown in fig. 1, a combined hydraulic-electric effect arc extinguishing device includes an insulator string 14, and upper and lower ends of the insulator string 14 are respectively provided with an upper hardware fitting 15 and a lower hardware fitting 17, and is characterized in that: the combined arc extinguishing device 16 is arranged at the lower end of the upper hardware fitting 15, and the combined arc extinguishing device 16 is arranged at the upper end of the lower hardware fitting 17 if the combined arc extinguishing device 16 is included or the combined arc extinguishing device 16 and the electrode are included, the combined arc extinguishing device 16 is arranged at the lower end of the upper hardware fitting 15 if the combined arc extinguishing device 16 and the electrode are included, the electrode is arranged at the upper end of the lower hardware fitting 17, and the insulation degree between the upper hardware fitting 15 and the lower hardware fitting 17 is larger than or equal to that of the insulator string 14, and the combined arc extinguishing device 16 is provided with a pre-ionization discharge device.

The combined arc extinguishing device is parallel to the installation position of the insulator and is positioned below the transmission line of the line, and the connection installation criterion is implemented according to the national standard and the related industry standard.

The installation adopts a mode of respectively installing one insulator string at the upper end and the lower end of the insulator string, and the upper end and the lower end of the insulator string are opposite. The cooperative arc extinction of the double devices greatly protects the safety of the insulator and the transmission line.

The electric arc is influenced by the liquid electric effect in the arc extinguishing chamber, a part of energy is extinguished by the fully-closed liquid electric arc extinguishing chamber and the open liquid electric chamber to strengthen the arc extinguishing effect, so that the amplitude of lightning current is reduced, the steepness of lightning wave is reduced, and the discharge time of the electric arc is prolonged. The remaining arc energy goes to ground through the conductive path of the lower electrode.

In the case of a combined arc suppressing device 16 and electrode, the arc suppressing effect is less good than that of two combined arc suppressing devices 16, but the cost is relatively low, and arc suppressing can be achieved as well. If the two combined arc extinguishing devices 16 are used for realizing two recoil points and two hydro-electric effects, the four points are realized for arc extinguishing, and the arc extinguishing effect is very good.

The pre-ionization discharging device comprises a lightning induction module, a trigger control module, an energy storage module and a pre-ionization module, wherein the lightning induction module is arranged on a power transmission line, a lightning conductor or a cross arm and is used for inducing the surrounding electric field intensity; the triggering control module judges the received signal and decides whether to start the energy storage module; the energy storage module is used for storing energy for generating pre-ionization; the pre-ionization module performs pre-ionization discharge by utilizing energy in the energy storage module, generates a large amount of free electrons, and even generates ionization spark discharge. When the lightning stroke is from the center of the span, the time of short circuit of the electric arc between the lightning conductor and the lead is far longer than the time of the lightning overvoltage conducted from the lightning stroke point to the tower along the lightning conductor or the lead, and after the air gap breaks down preferentially, the lightning conductor and the lead are equipotential and conducted to the lightning stroke point of the span center, so that the lightning stroke point is also equipotential and the span center cannot be flashover. The insulation mixing ratio is automatically adjusted under the two conditions of lightning presence and lightning absence, and the insulation mixing ratio under the two conditions is pulled open, so that the problem of attenuation of insulation damage to power frequency insulation strength is solved.

The system can supplement the liquid quantity in the cavity through rainwater to supplement the liquid loss caused by long-time discharge in the fully-closed liquid-electric arc extinguishing cavity. The arc extinguishing effect is good, lightning strike occurs when no rainwater exists, the arc extinguishing is performed by the fully-closed liquid-electricity arc extinguishing chamber, and the arc extinguishing is performed by the open liquid-electricity chamber through the gas-electricity effect; when rainwater exists, the rainwater is injected into the open liquid-electricity cavity, and the arc extinguishing effect is enhanced. The full-closed liquid-electric arc extinguishing chamber can meet the basic arc extinguishing requirement, and the open liquid-electric chamber can further strengthen the arc extinguishing effect and compensate the loss of liquid in the full-closed structure after a plurality of years. The pressure duration is long, the liquid bubbles generated by arc heat and the thermal evaporation effect store a large amount of kinetic energy, and the arc extinguishing pressure can be released permanently. The structure safety is improved, the open liquid electric chamber plays the effect of strengthening arc extinction in the process of arc extinction of the totally-enclosed liquid electric chamber, and the impact force that the arc extinction chamber structure received can be reduced simultaneously, the structure safety is ensured, and the dual purposes of improving arc extinction effectiveness and arc extinction safety are achieved.

The combined arc-extinguishing device 16 is shown in fig. 2, and comprises a recoil tube device 1 and a sealed liquid-electricity arc-extinguishing tube 2, wherein the recoil tube device 1 is arranged at the upper end of the sealed liquid-electricity arc-extinguishing tube 2, the bottom of the recoil tube device 1 is communicated with the upper end of the sealed liquid-electricity arc-extinguishing tube 2 through a conductive dielectric body, and skirt edges 5 are arranged on the outer sides of the recoil tube device 1 and the sealed liquid-electricity arc-extinguishing tube 2.

The device totally closed liquid electric arc extinguishing chamber and open liquid electric arc extinguishing chamber integrated configuration can utilize the rainwater to pour into behind the open arc extinguishing chamber increase liquid electric arc extinguishing chamber's space scale, reinforcing arc extinguishing ability. Under the condition of no rainwater, the open cavity forms a gas-electric effect arc extinguishing cavity, and the superposition strengthening effect of arc extinguishing can also be generated. The open chamber still has the ability to quench the arc by the gas-electric effect (lightning strike without rain) or the liquid-electric effect (lightning strike with rain) after the fully sealed liquid-electric quenching chamber is damaged. The reduction of the totally enclosed liquid can be compensated by the quenching capability of the gas-electricity or liquid-electricity effect generated by the open structure. Because the lightning strike probability occurs under the rainwater condition, the open cavity probability is the liquid electric effect, and the open cavity probability and the closed liquid electric cavity arc extinguishing chamber are together used for arc extinction to form a probability event, the common liquid electric effect has stronger arc extinguishing capability, the impact level born by the liquid arc extinguishing chamber with the full closed cavity is reduced, and the service life can be prolonged.

The insulating tube is made of inorganic nonmetallic materials with high hardness, high temperature resistance and high pressure resistance, and the periphery of the insulating tube is surrounded by umbrella skirts. The fully-enclosed liquid-electricity chamber inside the insulating tube is filled with arc extinguishing liquid, and is an area where electric arcs elastically collide.

In the embodiment of the utility model, the sealed liquid-electricity arc extinguishing tube 2 comprises an upper sealing plate 6, a sealed tube body 8, a liquid medium 10 and a lower sealing plate 11, wherein the upper sealing plate 6 and the lower sealing plate 11 are arranged at two ends of the sealed tube body 8 in a sealing way, the liquid medium 10 is arranged in the sealed tube body 8, and the upper sealing plate 6 and the lower sealing plate 11 are both metal plates. The sealed liquid-electricity arc-extinguishing tube 2 directly generates the liquid-electricity effect, the reflected shock wave superposition effect and the Pascal effect, and forms shock waves to perform arc extinguishing. The lower insulating plate 13 seals the lower sealing plate 11.

In the embodiment of the utility model, the inner wall of the sealing tube body 8 is provided with the elastic layer 9, and the elastic layer 9 is arranged between the inner wall of the sealing tube body 8 and the liquid medium 10. The elastic layer 9 increases the area of stress, reduces intraductal pressure, and the elastic material of the elastic layer 9 of setting in insulating tube has little pit at its surface, increases the area of stress of insulating tube inner wall, also improves the roughness on surface simultaneously, because satisfy the relation between pressure and the area and be: p=f/S, i.e. the force area is inversely proportional to the pressure.

The elastic layer 9 also reflects the fundamental wave of the hydro-electric effect, so that the fundamental wave acts on an electric arc channel, the electric arc is more easy to extinguish, the instant pressure born by the pipe wall is reduced, and the explosion of the insulating pipe is avoided.

In the embodiment of the utility model, the sealed liquid-electricity arc extinguishing tube 2 further comprises an upper vertical electrode 7 and a lower vertical electrode 12, wherein the upper vertical electrode 7 penetrates through the upper sealing plate 6 to be sealed, and the lower vertical electrode 12 penetrates through the lower sealing plate 11 to be sealed. The upper vertical electrode 7 and the lower vertical electrode 12 can realize the transmission of the arc recoil tube and the sealing tube, and can also transmit by remembering the original upper sealing plate 6 if the upper sealing plate is a metal plate.

In the embodiment of the utility model, the backflushing tube device 1 comprises a backflushing tube body 4 and an arc striking electrode 3, wherein the backflushing tube body 4 is of a hollow tube structure with an open upper end, and the arc striking electrode 3 is arranged at the top of the backflushing tube body 4.

When lightning strikes near a pole tower or the pole tower, a preionization discharge device arranged on the pole tower senses lightning, preionization discharge is carried out on the preionization discharge device to generate free electrons, the insulation degree between an upper fitting 15 and a lower fitting 17 is lower than that of an insulator string at the side edge, the free electrons are preferentially broken down by the lightning, when a lightning arc enters a recoil tube device 1, the recoil effect is firstly generated to extinguish the arc, when the rest of the arc enters a sealed liquid electric arc extinguishing tube 2, a discharge channel is formed on a liquid medium 10 in the sealed liquid electric arc extinguishing tube 2, a liquid electric effect, a reflection shock wave superposition effect and a Pascal effect are generated, a shock wave is formed, the shock wave acts on the discharge channel in an impulse or impact pressure mode, the center of the recoil arc extinguishes the arc after the shock wave impacts the side wall, the recoil and the liquid electric effect double arc extinction are realized, and the gap arc is extinguished.

The electrohydraulic effect: the liquid is injected into a cavity to trigger arc discharge, and the liquid in the whole discharge channel instantaneously expands, so that the process of vaporization, decomposition and ionization into high-temperature plasma occurs in the discharge channel, and a mechanical pressure wave (the highest pressure of the directional impact pressure wave can reach about 100 Mpa) which is rapidly transmitted outwards is formed and is rapidly transmitted through a liquid phase, but the liquid can be regarded as a shock wave transmission medium which can not be compressed, so that ultra-high power mechanical energy acts on the external environment when the discharge channel performs liquid phase discharge, namely a liquid-electricity effect.

In the arc extinguishing device of the lightning fully-closed liquid-electricity chamber and the open liquid-electricity chamber, the moment of high-gradient pre-breakdown occurs, the liquid cannot be deformed and displaced instantaneously because the lightning arc impact time is extremely short, at the moment, the liquid can be regarded as a shock wave transmission medium which cannot be compressed by the liquid and is harder to compress than the common single liquid, the pressure of hundreds of megapascals can be synchronously generated under the hammering action of the electric arc, the pressure is accurate and single, the pressure is accurately released to the impact electric arc in the arc extinguishing device and is cut off, and an arc establishing channel is cut off. The open liquid electric cavity can strengthen the arc extinguishing effect due to the gas-electric effect, and meanwhile, the damage of an arc extinguishing structure caused by the fact that excessive arc energy acts on the inner wall of the insulating tube is avoided, and the structural reliability is improved.

Reflected shock wave superposition effect: the superposition effect of the reflected shock wave is that the shock wave and the reflected shock wave are superposed and an interference phenomenon occurs, so that the energy of vibration enhanced vibration is increased, and large energy is obtained in a short time.

When the electric arc enters the arc extinguishing channel containing the mixed liquid, the temperature of plasma generated by liquid phase discharge is up to 1500-3000K. The high temperature and the high pressure generated in the channel can not leak outwards in time, the shock wave is reflected back and forth on the inner wall surface of the arc extinguishing channel, and the reflected waves of all the wall surfaces are mutually overlapped to increase the overpressure peak value.

The reflected shock waves generated by various pressures generated in the pipe after encountering the bottom sealing barrier are superposed together, and the regular reflected shock waves are sprayed out from the arc inlet, so that the pressure in the pipe in the impact stage and the power frequency arc extinction is enhanced, and the power frequency freewheel is inhibited.

The hydrodynamic effect and the reflected shock wave together inhibit arc re-ignition: when the arc plasma enters the arc extinguishing channel, the physical shape is changed, the rough arc is changed into an extremely fine arc, the radial pressure is converted into the axial pressure, meanwhile, due to the limitation of the pipe wall, the speed and the temperature of the arc after entering the arc extinguishing channel are increased, the pressure in the pipe is increased, and finally, the explosion effect is generated, so that the arc is subjected to recoil acting force. Meanwhile, the liquid-electricity effect generated by the electric arc in the liquid further increases the pressure, the sustained discharge condition and the reburning condition are damaged by the lasting huge recoil pressure, after the impact electric arc is cut off, the reburning breakdown time is greatly delayed by more than ten to more than tens of microseconds, the steepness of the lightning current is obviously reduced by 90%, and the current amplitude is attenuated by more than 50%.

The specific process of the liquid-electricity effect is as follows: the liquid medium 10 adopts emulsion mixed liquid of oil and water or insulating oil, the oil is wrapped by water and then is connected into a piece through water, a complete water medium discharge channel is formed, the breakdown characteristic of a single pure water medium is reserved, in the process of discharging an electric arc along the water medium, electric arc plasma is subjected to incompressibility restriction generated by wrapping of the insulating oil, pressure intensity and damping shock wave conduction pressure intensity are generated, the liquid cannot be deformed and displaced instantaneously due to short lightning arc impact time, the mixed liquid can be regarded as a shock wave transmission medium which cannot be compressed by the liquid at the moment, the mixed liquid is more difficult to compress than a medium which is common single liquid, the mixed liquid is higher in viscosity and higher in surface tension, so that the force of the emulsion mixed liquid in the original state can be increased, under the pressure effect generated by the electric arc space occupation breakdown mixed liquid, the pressure intensity of hundreds of megapascals is synchronously generated on the contact surface of the electric arc and the emulsion mixed liquid, the pressure intensity of the hundreds of megapascals is synchronously counteracted and the electric arc is eliminated, the incompressibility of the high-viscosity mixed liquid is ensured, meanwhile, the high-viscosity liquid can absorb more shock wave transmission medium which cannot be compressed, the pressure intensity is more stable, and the damping shock wave is durable to the damping structure is improved.

In the process of dielectric oil breakdown by the hydraulic electric effect impact arc under the condition of dielectric oil, the volume occupation requirement is set for the dielectric oil in a very short time, because the viscosity of the dielectric oil is high, the displacement is not enough to yield the space occupied by the arc in a very short time, the strong countermeasure of the space position is formed between the occupation of the arc and the displacement of the dielectric oil, thereby the mechanical pressure peak shock wave of hundred megapascals is generated, the shock wave is reacted to the power frequency arc body, and the factors for improving the pressure peak value of the hydraulic electric effect shock wave and reducing the time of the pressure peak value of the hydraulic electric effect comprise: the insulation strength can improve the breakdown field strength, and meanwhile, a high field strength extremely fast electron collapse process is formed, so that the arc breakdown speed is improved, the sudden performance of the space occupation of an arc is increased, the space abdication speed is reduced due to the high viscosity of the insulating oil, a large amount of arc heat can be absorbed by the high specific heat capacity, and the arc temperature is reduced.

The specific process of the superposition effect of the reflected shock waves is as follows:

the shock wave and the reflected shock wave meet and overlap, the interference phenomenon occurs, so that the energy of vibration enhanced vibration is increased, when an electric arc enters an arc extinguishing channel containing emulsion mixed liquid, the temperature of plasma generated by liquid phase discharge is up to 1500-3000K, high temperature and high pressure generated in the channel cannot leak outwards in time, the shock wave is reflected back and forth on the inner wall surface of the arc extinguishing channel, and the reflected waves of the inner wall surface overlap each other, so that an overpressure peak value is increased;

if the emulsifier is an ionic surfactant, on the interface, the emulsion droplets are charged due to ionization and adsorption, and the charge size depends on ionization intensity; the non-ionic surfactant has friction effect to make the liquid drop have charge, and its charge size is related to the concentration of external phase ion, dielectric constant and friction constant, when the charged liquid drop is close to it, it produces repulsive force to make it difficult to coalesce, so that it can raise emulsion stability, and the charged liquid drop of emulsion can form electric double layer structure on two sides of interface, and the repulsive effect of electric double layer can produce great mechanical effect, and can produce reflective impact pressure in the interior of insulating tube to act on electric arc.

The specific process of generating the pascal effect is: the pressure change of a certain part of static fluid in the sealed tube structure is transmitted to all directions unchanged, and then the liquid medium around is impacted by larger acting force from a discharge channel in the insulated tube, the acting force bounces after striking against the wall of the insulated tube, the acting force with the direction pointing to the center of the insulated tube is formed, the impact pressure and the occupied pressure peak value are generated in the hydro-electric effect, the dual pressure sources are amplified together, the electric arc is intercepted, the longer the electric arc in the insulated tube is, the larger the acting force on the wall of the insulated tube is, and the larger the impact pressure for intercepting the electric arc is, so that the secondary reburning of the electric arc is prevented.

The elastic layer 9 is arranged in the sealed liquid-electricity arc extinguishing tube 2, the stress area is increased by the elastic layer 9, the pressure intensity in the tube is reduced, the elastic material of the elastic layer 9 arranged in the insulating tube is provided with small pits on the surface of the elastic material, the stress area of the inner wall of the insulating tube is increased, and meanwhile, the roughness of the surface is improved, and the pressure and the area satisfy the following relations: p=f/S, namely the inverse proportion between the stress area and the pressure, after the elastic layer 9 is added in the sealed hydro-electric arc extinguishing tube 2 of the sealed tube structure, the maximum pressure in the sealed hydro-electric arc extinguishing tube 2 is lower than the pressure before the elastic material is not added under the action of arc impact, so that the condition that the explosion of the insulating tube is caused due to the overlarge pressure in the tube is avoided.

Meanwhile, the impact force generated by Pascal effect is avoided to directly impact the insulating tube, impact force is firstly formed on the elastic insulating material by the impact wave in the tube, the reaction force acting on the inner surface of the insulating tube is reduced, and the insulating tube with smaller hardness is prevented from being broken due to the impact of the reaction force.

Arc extinguishing method by using electric effect of insulating oil

The constraint space is an arc extinguishing space for storing insulating oil, and the structure of the arc extinguishing space comprises a gap electrode, insulating oil and an insulating constraint space for wrapping the insulating oil and the electrode. The liquid electric effect is that in the process of striking the electric arc to break down insulating oil, the electric arc brings out the volume occupation requirement on the insulating oil in a very short time, and because the viscosity of the insulating oil is high, the electric arc occupation space is not yielded by displacement in a very short time, so that the electric arc occupation and the insulating oil are not strongly opposed to the space position yielded by displacement, and therefore, a mechanical pressure peak shock wave of hundreds of megapascals is generated, the shock wave reacts to a power frequency electric arc body, and a 40kA full-scale power frequency electric arc extinguishing effect is formed.

Action of the constraint Structure

The constraint structure eliminates the splashing and overflowing loss of insulating oil in the process of quenching by the liquid electric effect through tightness, and meanwhile, the constraint space focuses the reflection of the liquid electric effect shock wave test wave, so that the pressure peak gain and the pressure gain rate of the shock wave are further improved, and the quenching acceleration function is realized. Factors that increase the peak electrohydraulic effect shock pressure and simultaneously decrease the peak electrohydraulic effect pressure time include: the insulation strength can improve the breakdown field strength, and simultaneously, a high field strength extremely fast electron breakdown process is formed, so that the arc breakdown speed is improved, and the burstiness of the occupied space of an arc is increased; the high viscosity of the insulating oil slows down the space abdication speed; the high specific heat capacity absorbs a large amount of arc heat, reducing the arc temperature.

Lifting point of arc extinguishing index of electric effect of insulating oil

The peak time of the hydraulic effect pressure is reduced: the reduction of the time of the pressure peak of the liquid-electricity effect forms early intervention of arc extinction, and reduces the response time and the completion time of arc extinction. Through early intervention in the arc establishment process, the super-strong hydraulic effect shock wave pressure arc extinction is carried out under the condition that the power frequency arc is in an extremely weak transient state, so that the formation of a fast-to-strong asymmetric arc extinction situation is facilitated.

Peak boost in electrohydraulic effect: the improvement of the hydraulic-electric effect pressure peak value is combined with early intervention determined by the time of the minimum hydraulic-electric effect shock wave pressure peak value to form an asymmetric situation that the arc extinguishing pressure is far greater than the arc breaking resisting pressure, so that the arc extinguishing threshold value is improved.

3. Supporting point for arc extinction advantage of electric effect of insulating oil

The hydro-electric effect insulating oil liquid electric effect arc extinguishing process under the insulating oil condition comprises the following steps: an insulating oil breakdown process, a hydro-electric effect process, an arc extinguishing process and a re-ignition suppressing process. The high viscosity, the high specific heat capacity and the high medium strength of the insulating oil affect the peak value and the peak value time of the hydro-electric effect pressure; the influence of the pressure peak value and the peak value time on the arc extinction threshold value and the arc extinction time; the effect of the sealing structure on the pressure peak and the peak time.

1. Compared with water, the insulating oil breakdown field intensity is high, which is favorable for improving the pressure peak value of the liquid electric effect and reducing the time of the pressure peak value: the insulating oil has much higher insulating strength and breakdown field strength than air and water, and under the same gap distance, the breakdown voltage and the bursting property of the breakdown process are improved, and the bursting property of the current can be increased by improving the breakdown voltage. The steady-state value of the current after breakdown is increased along with the increase of the breakdown voltage, so that the current change rate is increased, and the pressure peak value of the liquid-electric effect proportional to the current change rate is also increased. The improvement of the current change rate also correspondingly improves the climbing speed of the hydraulic-electric effect pressure intensity, thereby reducing the peak time of the hydraulic-electric effect pressure intensity.

2. The high viscosity of the insulating oil compared with water is beneficial to improving the time of the hydraulic effect pressure peak value and the male building pressure peak value. The viscosity of the insulating oil is high, the bonding force between molecules is inevitably increased, the space occupation difficulty of the electric arc is increased along with the increase of the space occupation difficulty of the electric arc in the arc breakdown process, the pressure required by the space occupation realization in the process of extruding the insulating oil by the electric arc is increased, the pressure applied to the insulating oil by the electric arc is increased, and the arc extinguishing pressure of the reaction of the insulating oil to the electric arc is also increased. Because the sensitivity of the insulating oil with high viscosity property for resisting the occupation of the breakdown arc volume is increased, under the condition of extremely small breakdown current, extremely high hydraulic effect pressure can be generated for resisting the occupation of the small arc volume, so that the time of the pressure peak of the hydraulic effect pressure is reduced, and the pressure peak is improved.

3. Compared with water, the insulating oil has higher stability: the insulating oil is an organic high polymer material, is not easy to decompose, gasify and age, has more stable physical and chemical properties, and meets the requirements of repeated arc extinction and maintenance-free arc extinction.

4. Insulating oil has a higher specific heat capacity than water: the specific heat capacity of the insulating oil is high, so that a large amount of arc temperature can be absorbed, the arc is cooled, and the vulnerability and the easy-to-extinguish performance of the arc are improved;

5. compared with water, the insulating oil has better medium strength recovery property: after the liquid electric effect breaks the electric arc, the electric arc fracture is filled with insulating oil, and the breakdown field strength of the insulating oil is higher than that of water, so that the reburning resistance is improved.

6. Compared with water, the dielectric oil electric effect extinction threshold is larger: through the characteristics that insulating oil liquid electric effect pressure has higher sensitivity, the arc extinction start time is advanced, and the higher expected current can be extinguished in the initial arc establishing section, so that the 40kA full-scale power frequency short-circuit current arc extinction requirement is met.

7. Compared with water, the electric effect arc extinguishing speed of the insulating oil is faster: the arc extinction by the electric effect of the insulating oil liquid has higher arc extinction sensitivity, so that the arc extinction time is advanced. The time for extinguishing the 40kA full-scale short-circuit current is tens to hundreds of microseconds, which is less than the relay protection outlet response time of tens of milliseconds, and the requirement for extinguishing the 40kA full-scale power frequency short-circuit current before the relay protection response time is met.

8. Insulation fit for each voltage class: the insulation fit requirement under any voltage level can be realized by controlling the length of the liquid electric effect arc extinguishing section and the length of the air gap.

9. Compared with water and valve plates, the insulating oil liquid electric effect arc extinction is quicker, the time lag effect of the valve plates is avoided, the pressure peak value is lower, the pressure peak value time lag and the medium recovery strength are low due to low viscosity and low breakdown field intensity in the process of the water medium liquid electric effect, the arc extinction time is long and the insulating oil liquid electric effect is easy to burn again to generate larger heating value, the water gasification and decomposition are initiated to cause the structure damage, and the safety and durability of the insulating oil liquid electric effect lightning protection are improved.

4. Relates to application scenes

1. Overhead line insulating oil liquid electric effect arc extinguishing lightning protection device: the electric effect of the insulating oil liquid reduces the time of the pressure peak value of the arc extinguishing shock wave, improves three dimensions of the pressure peak value of the arc extinguishing shock wave and the medium recovery strength, improves the arc extinguishing threshold value, reduces the arc extinguishing time and provides a new method for solving the lightning trip. Is suitable for arc extinction requirements of 10kV, 35kV, 110kV, 220kV, 500kV, 800kV and 1000kV voltage levels.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (5)

1. The utility model provides a combination liquid electric effect arc extinguishing device, includes insulator chain (14), and the upper and lower both ends of insulator chain (14) are provided with gold utensil (15) and lower gold utensil (17) respectively, its characterized in that: the combined arc extinguishing device comprises an upper hardware fitting (15), and is characterized by further comprising two combined arc extinguishing devices (16) or one combined arc extinguishing device (16) and an electrode, wherein if the combined arc extinguishing device comprises the two combined arc extinguishing devices (16), one combined arc extinguishing device (16) is arranged at the lower end of the upper hardware fitting (15), the other combined arc extinguishing device (16) is arranged at the upper end of the lower hardware fitting (17), if the combined arc extinguishing device comprises the combined arc extinguishing device (16) and the electrode, the one combined arc extinguishing device (16) is arranged at the lower end of the upper hardware fitting (15), the electrode is arranged at the upper end of the lower hardware fitting (17), and the insulation degree between the upper hardware fitting (15) and the lower hardware fitting (17) is greater than or equal to that of an insulator string (14), and a pre-ionization discharge device is arranged on the combined arc extinguishing device (16).

2. The combined hydro-electric effect arc extinguishing device of claim 1, wherein: the combined arc-extinguishing device (16) comprises a recoil tube device (1) and a sealed liquid-electricity arc-extinguishing tube (2), wherein the recoil tube device (1) is arranged at the upper end of the sealed liquid-electricity arc-extinguishing tube (2), the bottom of the recoil tube device (1) is communicated with the upper end of the sealed liquid-electricity arc-extinguishing tube (2) through a conductive dielectric body, and skirt edges (5) are arranged on the outer sides of the recoil tube device (1) and the sealed liquid-electricity arc-extinguishing tube (2).

3. The combined hydro-electric effect arc extinguishing device of claim 2, wherein: the sealed liquid-electricity arc extinguishing tube (2) comprises an upper sealing plate (6), a sealed tube body (8), a liquid medium (10) and a lower sealing plate (11), wherein the upper sealing plate (6) and the lower sealing plate (11) are arranged at two ends of the sealed tube body (8) in a sealing mode, the liquid medium (10) is arranged in the sealed tube body (8), and the upper sealing plate (6) and the lower sealing plate (11) are metal plates.

4. A combined hydro-electric effect arc extinguishing device according to claim 3, characterized in that: an elastic layer (9) is arranged on the inner wall of the sealing pipe body (8), and the elastic layer (9) is arranged between the inner wall of the sealing pipe body (8) and the liquid medium (10).

5. The combined hydro-electric effect arc extinguishing device of claim 4, wherein: the sealed liquid-electricity arc extinguishing tube (2) further comprises an upper vertical electrode (7) and a lower vertical electrode (12), wherein the upper vertical electrode (7) penetrates through the upper sealing plate (6) to be sealed, and the lower vertical electrode (12) penetrates through the lower sealing plate (11) to be sealed;

the back flushing pipe device (1) comprises a back flushing pipe body (4) and an arc striking electrode (3), wherein the back flushing pipe body (4) is of a hollow pipe structure with an opening at the upper end, and the arc striking electrode (3) is arranged at the top of the back flushing pipe body (4).

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