CN218940311U - Intensified hydro-electric effect arc extinguishing device - Google Patents
Intensified hydro-electric effect arc extinguishing device Download PDFInfo
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- CN218940311U CN218940311U CN202220924229.4U CN202220924229U CN218940311U CN 218940311 U CN218940311 U CN 218940311U CN 202220924229 U CN202220924229 U CN 202220924229U CN 218940311 U CN218940311 U CN 218940311U
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Abstract
The utility model provides a reinforced liquid electric effect arc-extinguishing device, which belongs to the technical field of lightning protection and arc extinguishing, and comprises an upper liquid electric arc-extinguishing device, a lower electrode, an upper electrode metal plate, a lower electrode metal plate and a gap insulator, wherein the upper liquid electric arc-extinguishing device and the lower electrode are respectively arranged on cross bars at two ends of an insulator string, the upper liquid electric arc-extinguishing device and the lower electrode are oppositely arranged, the upper electrode metal plate is arranged at the bottom of the upper liquid electric arc-extinguishing device, the lower electrode metal plate is arranged at the top of the lower electrode, and the gap insulator is arranged between the upper electrode metal plate and the lower electrode metal plate. Through setting up the clearance insulator between upper end liquid electric arc extinguishing device and the bottom electrode to make them form a whole, can not appear rocking because of the wind blows, lead to the fact wearing and tearing to the power transmission line, liquid electric arc extinguishing device cuts electric arc rapidly, and electric arc is discharged in liquid and is produced the liquid electric effect, forms impact pressure wave rapidly, and impact electric arc is cut immediately when just forming.
Description
Technical Field
The utility model relates to the technical field of lightning protection and arc extinction, in particular to an arc extinction device with a reinforced liquid-electricity effect.
Background
The existing overhead power transmission and distribution line lightning protection system mainly takes a blocking type lightning protection mode, and mainly adopts the steps of erecting a lightning conductor and a coupling ground wire, reducing the grounding resistance of a pole tower, enhancing the insulation of a line, installing a line lightning arrester and the like, so that the main purpose is to limit the lightning overvoltage and reduce the lightning trip. However, the blocking type lightning protection mode is limited by the effectiveness, safety and economy, so that only a single weak lightning stroke can be protected, huge gaps exist for huge lightning stroke and multiple lightning stroke protection, and the lightning stroke tripping rate is high for a long time.
The existing 'dredging type' lightning protection mode is used as the supplement of the 'blocking type' lightning protection mode, mainly, parallel protection gaps are arranged at two ends of an insulator (string), the structure is simple, the installation is convenient, in order to ensure that the discharge voltage of the gaps is lower than that of the insulator (string), the gap distance L is 0.7-0.8 times of the length distance L0 of the insulator, the L/L0 is called an insulation mixing ratio, and the value is usually smaller than 1. The static insulation mixing ratio is the same under the condition of lightning or no lightning, and the parallel protection gap is broken down preferentially under the condition of lightning, so that the insulator flashover is avoided; but the power frequency insulation strength is damaged under the condition of no lightning, the power frequency breakdown voltage is reduced, the line insulation level is reduced, and the gap breakdown is easy to occur under the power frequency working voltage and the operation overvoltage, so that the misoperation is caused.
Meanwhile, when the power transmission line is struck by lightning, impact flashover is caused, so that the line insulator flashover is caused, and then a large power frequency freewheel is generated, so that the insulator string and the hardware fitting are damaged, and line accidents are caused; if lightning strikes the transmission line or the lightning conductor, the transmission line may be broken, so that the transmission work cannot be performed.
The existing arc extinguishing device is directly installed and hung on a power transmission line, the height of the power transmission line is high, wind power is large, each suspended household device often shakes, and then the power transmission line is worn to cause power transmission damage and the like. Therefore, it is desirable to design an arc extinguishing device that is more stable and less worn on the transmission line.
Disclosure of Invention
The utility model aims to provide an arc extinguishing device for strengthening the liquid electric effect, which solves the prior technical problems.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a reinforce liquid electric effect arc extinguishing device, includes upper end liquid electric arc extinguishing device, the bottom electrode, upper electrode metal sheet, lower electrode metal sheet and gap insulator, upper end liquid electric arc extinguishing device and bottom electrode set up respectively on the horizontal pole at insulator chain's both ends, upper end liquid electric arc extinguishing device sets up with the bottom electrode is relative, upper electrode metal sheet sets up the bottom at upper end liquid electric arc extinguishing device, lower electrode metal sheet sets up the top at the bottom electrode, gap insulator sets up between upper electrode metal sheet and lower electrode metal sheet.
Further, the upper-end liquid electric arc extinguishing device comprises a tube body, a sealing layer, an upper-end metal plate, a lower-end metal plate, insulating oil, an upper-end electrode and a lower-end electrode, wherein the upper-end metal plate and the lower-end metal plate are arranged at two ends of the tube body, the sealing layer is arranged on the inner sides of the upper-end metal plate and the lower-end metal plate, the insulating oil is arranged in the tube body, the upper-end electrode penetrates through the upper-end metal plate and the sealing layer, and the lower-end electrode penetrates through the lower-end metal plate and the sealing layer.
Further, the inner wall of the pipe body is provided with an elastic layer, the elastic layer is an insulating elastic layer, and one end of the pipe body is provided with an insulating oil injection port.
Due to the adoption of the technical scheme, the utility model has the following beneficial effects:
according to the utility model, the gap insulator is arranged between the upper-end liquid electric arc-extinguishing device and the lower electrode, so that the upper-end liquid electric arc-extinguishing device and the lower electrode form a whole, abrasion to a power transmission line is avoided due to shaking when wind blows, an electric arc is rapidly intercepted by the liquid electric arc-extinguishing device, a liquid electric effect is generated by discharging the electric arc in liquid, an impact pressure wave is rapidly formed, the impact electric arc is immediately intercepted when the impact electric arc is just formed, liquid in the cover quickly flows back into an arc-extinguishing channel after the insulation strength is recovered and rapidly extinguished, the next lightning stroke is prepared, carbon emission is reduced, and the liquid medium is safer and cleaner after replacing a valve plate and can effectively reduce the carbon emission.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present utility model;
fig. 2 is a schematic structural view of the hydro-electric arc extinguishing device of the present utility model.
In the drawing, a 1-pipe body, a 2-sealing layer, a 3-upper end metal plate, a 4-lower end metal plate, a 5-elastic layer, 6-insulating oil, a 7-upper end electrode, an 8-lower end electrode, a 9-insulating oil injection port, a 10-skirt, a 14-upper end liquid electric arc extinguishing device, a 15-lower electrode, a 16-upper electrode metal plate, a 17-lower electrode metal plate and an 18-gap insulator 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, the enhanced hydroelectric arc extinguishing device comprises an upper-end hydroelectric arc extinguishing device 14, a lower electrode 15, an upper-electrode metal plate 16, a lower-electrode metal plate 17 and a gap insulator 18, wherein the upper-end hydroelectric arc extinguishing device 14 and the lower electrode 15 are respectively arranged on cross bars at two ends of an insulator string, the upper-end hydroelectric arc extinguishing device 14 and the lower electrode 15 are oppositely arranged, the upper-electrode metal plate 16 is arranged at the bottom of the upper-end hydroelectric arc extinguishing device 14, the lower-electrode metal plate 17 is arranged at the top of the lower electrode 15, and the gap insulator 18 is arranged between the upper-electrode metal plate 16 and the lower-electrode metal plate 17.
In the embodiment of the present utility model, as shown in fig. 2, the upper-end hydro-electric arc extinguishing device 14 includes a pipe body 1, a sealing layer 2, an upper-end metal plate 3, a lower-end metal plate 4, insulating oil 6, an upper-end electrode 7 and a lower-end electrode 9, the upper-end metal plate 3 and the lower-end metal plate 4 are disposed at both ends of the pipe body 1, the sealing layer 2 is disposed inside the upper-end metal plate 3 and the lower-end metal plate 4, the insulating oil 6 is disposed in the pipe body 1, the upper-end electrode 7 is disposed through the upper-end metal plate 3 and the sealing layer 2, and the lower-end electrode 9 is disposed through the lower-end metal plate 4 and the sealing layer 2.
Through setting up the clearance insulator 18 between upper end liquid electric arc-extinguishing device 14 and bottom electrode 15 and fix for must the distance between upper end liquid electric arc-extinguishing device 14 and the bottom electrode 15, the insulating degree just can not appear changing, thereby when guaranteeing the thunderbolt, the flashover appears from between upper end liquid electric arc-extinguishing device 14 and the bottom electrode 15 earlier, and traditional upper limit suspension's mode appears rocking when wind is big, appears that the insulating degree changes, and when becoming big, probably the insulating degree is bigger than the insulator cluster, can't appear the flashover. And meanwhile, the main structure is fixed into a whole, so that the installation and fixation effects are better, and the condition that the transmission line is swayed and worn is avoided.
The pipe body 1 is an insulating shell and is made of elastic materials such as rubber materials, epoxy resin, nylon glass fibers or PC materials, so that the pipe body 1 has certain deformability, and the pipe body cannot crack when the hydro-electric effect occurs.
The inner wall of the pipe body 1 is provided with an elastic layer 5, the elastic layer 5 is an insulating elastic layer, and one end of the pipe body 1 is provided with an insulating oil injection port 9. If the elastic layer 5 is provided, the tube body 1 may be a tube body of a hard structure. Without this elastic layer, an elastic tube is provided with the best. The elastic layer 5 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.
When a lightning strike is in the vicinity of a pole tower or a pole tower, the insulation degree of the upper-end liquid-electric arc extinguishing device 14 and the lower electrode 15 is lower than that of a side insulator string, a gap channel between the upper-end liquid-electric arc extinguishing device 14 and the lower electrode 15 is broken down preferentially by the lightning, an arc is blown over from the upper-end liquid-electric arc extinguishing device 14 to the lower electrode 15, a discharge channel is formed in the upper-end liquid-electric arc extinguishing device 14 and the lower electrode 15, a liquid-electric effect, a reflected shock wave superposition effect and a Pascal effect are generated, a shock wave is formed, the discharge channel acts in a manner of impulse or impact pressure, the shock wave bounces, a force directed to the center of a tube is formed, the arc is cut off, and the gap insulator 18 connects the upper-end liquid-electric arc extinguishing device 14 and the lower electrode 15 into a whole and is fixed, and shaking or displacement cannot occur.
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, the energy of vibration enhanced vibration is increased, when the electric arc enters an arc extinguishing channel of insulating oil, 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.
After the electric arc enters the sealed pipeline, the electric arc is discharged in the pipeline filled with insulating oil, part of liquid in the discharge channel is instantaneously vaporized, decomposed and ionized into high-temperature ions to expand, the volume of the expanded liquid is thousands of times of that of the original liquid to form an outwards-transmitted mechanical pressure wave, but as the liquid can be regarded as a shock wave transmission medium which cannot be compressed by the electric arc, the electric arc plays a role in occupying pressure of the liquid, when the discharge channel is subjected to liquid phase discharge, an external force chemical effect is shown, when the inside of the insulating pipe containing the liquid is struck by lightning, the pressure of more than 100Mpa is synchronously generated by the liquid under the hammering action of the electric arc at the moment, the insulating pipe wall generates shock waves in the insulating oil due to the interaction of the forces, the electric arc is integrally pressed and extinguished in an integral pressing mode, the electric arc is instantaneously extinguished, and is released to act on the electric arc in the pipe through the pressure to cut off the electric arc, and the arc is cut off to construct the arc channel.
The pressure change of a certain part of static fluid in the closed container is transmitted to all directions constantly, so that the surrounding insulating oil is impacted by a larger acting force from a discharge channel in the insulating tube, the acting force bounces after striking against the wall of the insulating tube, the acting force with the direction pointing to the center of the insulating tube is formed, the impact pressure and the occupied pressure peak value are further enhanced, the dual pressure sources are amplified together, the electric arc is intercepted, the longer the electric arc in the insulating tube is, the larger the acting force on the wall of the insulating 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.
In the insulation constraint space, the liquid electric effect is that in the process of breaking down the insulating oil by the impact arc, the arc brings out the volume occupation requirement on the insulating oil, and because the viscosity of the insulating oil is high, the displacement of the insulating oil is not enough to yield the space occupied by the arc in a very short time, so that the arc occupation and the displacement of the insulating oil are not enough to yield the strong countermeasures of the space position, thereby generating a mechanical pressure peak shock wave of hundreds of megapascals, and the shock wave is reacted to a power frequency arc body to form the effect of extinguishing 40kA full-scale power frequency arc.
The upper end liquid electric arc extinguishing device 14 is set to be a sealed constraint structure, the constraint structure eliminates the splashing and overflowing loss of insulating oil in the liquid electric effect arc extinguishing process through tightness, meanwhile, the constraint space focuses the reflection of the liquid electric effect shock wave test wave, the shock wave pressure peak gain and the pressure gain rate are further improved, the arc extinguishing effect is accelerated, the liquid electric effect shock wave pressure peak value is improved, the liquid electric effect pressure peak value time is reduced, the electric breakdown field intensity is improved, the electric breakdown process is formed while the electric breakdown field intensity is improved, the electric arc breakdown speed is improved, the sudden performance of the electric arc space occupation is increased, the space abdication speed is slowed down by the insulating oil, a large amount of electric arc heat is absorbed, and the electric arc temperature is reduced.
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.
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.
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.
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.
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.
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;
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.
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.
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.
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.
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.
Relates to application scenes
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 (3)
1. An intensified hydroelectric effect arc extinguishing device is characterized in that: including upper end liquid electric arc extinguishing device (14), lower electrode (15), upper electrode metal sheet (16), lower electrode metal sheet (17) and gap insulator (18), upper end liquid electric arc extinguishing device (14) and lower electrode (15) set up respectively on the horizontal pole at insulator chain's both ends, upper end liquid electric arc extinguishing device (14) set up with lower electrode (15) relatively, upper electrode metal sheet (16) set up the bottom at upper end liquid electric arc extinguishing device (14), lower electrode metal sheet (17) set up at the top of lower electrode (15), gap insulator (18) set up between upper electrode metal sheet (16) and lower electrode metal sheet (17).
2. The enhanced-electrohydraulic-effect arc extinguishing device according to claim 1, wherein: the upper end liquid electric arc extinguishing device (14) comprises a tube body (1), a sealing layer (2), an upper end metal plate (3), a lower end metal plate (4), insulating oil (6), an upper end electrode (7) and a lower end electrode (8), wherein the upper end metal plate (3) and the lower end metal plate (4) are arranged at two ends of the tube body (1), the sealing layer (2) is arranged on the inner sides of the upper end metal plate (3) and the lower end metal plate (4), the insulating oil (6) is arranged in the tube body (1), the upper end electrode (7) is arranged through the upper end metal plate (3) and the sealing layer (2), and the lower end electrode (8) is arranged through the lower end metal plate (4) and the sealing layer (2).
3. The enhanced-electrohydraulic-effect arc extinguishing device according to claim 2, wherein: the inner wall of the pipe body (1) is provided with an elastic layer (5), the elastic layer (5) is an insulating elastic layer, and one end of the pipe body (1) is provided with an insulating oil injection port (9).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220924229.4U CN218940311U (en) | 2022-04-20 | 2022-04-20 | Intensified hydro-electric effect arc extinguishing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220924229.4U CN218940311U (en) | 2022-04-20 | 2022-04-20 | Intensified hydro-electric effect arc extinguishing device |
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| CN218940311U true CN218940311U (en) | 2023-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114629002A (en) * | 2021-04-23 | 2022-06-14 | 南宁超伏电气科技有限公司 | Method and device for strengthening electro-hydraulic effect arc extinction |
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2022
- 2022-04-20 CN CN202220924229.4U patent/CN218940311U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114629002A (en) * | 2021-04-23 | 2022-06-14 | 南宁超伏电气科技有限公司 | Method and device for strengthening electro-hydraulic effect arc extinction |
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