CN210326483U - Novel trapezoidal arc extinguishing lightning protection device - Google Patents
Novel trapezoidal arc extinguishing lightning protection device Download PDFInfo
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- CN210326483U CN210326483U CN201920515121.8U CN201920515121U CN210326483U CN 210326483 U CN210326483 U CN 210326483U CN 201920515121 U CN201920515121 U CN 201920515121U CN 210326483 U CN210326483 U CN 210326483U
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Abstract
The utility model discloses a novel trapezoidal arc extinguishing lightning protection device, which mainly comprises an arc extinguishing body and an electrode; a plurality of insulating partition plates are longitudinally arranged in the arc extinguisher body to form a plurality of independent back-flushing perfusion arc extinguishing cavities in the arc extinguisher body; a recoil device is arranged in each recoil pouring arc extinguishing cavity and is arranged in a spiral step arrangement mode inside the arc extinguishing body; wall electrodes are arranged on the insulating partition board between every two adjacent backflushing devices, the top of the backflushing device positioned below is connected with one surface of the wall electrode, and the bottom of the backflushing device positioned above is connected with the other surface of the wall electrode, so that the backflushing devices are sequentially electrically connected together end to end; the top of the uppermost backflushing device is connected to an electrode. The utility model discloses can effectively prevent lightning protection device flashover problem, reduce power equipment thunderbolt tripping operation rate, protect the electric power facility, improve the electric wire netting reliability, be favorable to electric power safety in production.
Description
Technical Field
The utility model belongs to the lightning protection device that power transmission and distribution overhead line used relates to a novel trapezoidal arc extinguishing lightning protection device.
Background
Lightning strike can bring different forms of damage and destruction to electric power facilities, lightning strike overvoltage can be caused in an electric power system by thundercloud discharge, and common overvoltage in an overhead line comprises overvoltage of lightning strike near the overhead line on a power transmission line through electromagnetic induction and overvoltage generated by lightning striking on a wire directly. Lightning stroke causes overvoltage, and can damage insulators and power transmission lines; lightning stroke causes flashover discharge of the insulator, can cause burning and shedding on the surface of porcelain or reticular cracks on the glass insulator, and greatly reduces the insulating strength; lightning strikes on a power transmission line or a lightning conductor can cause strand breakage and even breakage, so that power transmission work cannot be carried out.
Lightning protection of a power transmission line is always important content of lightning protection work of a power department, and lightning faults are still one of important factors influencing the safety of a power grid. Impact flashover caused by lightning strike on a power transmission line causes flashover of a line insulator, then large power frequency follow current is generated, an insulator string and hardware fittings are damaged, and line accidents are caused. The protection of the power department is generally realized by additionally arranging a line lightning protector on a power transmission line.
The applicant and the related inventors have found the following problems in the existing lightning protection device in the continuous research process: 1) the arc extinguishing capacity is not strong, and the arc extinguishing energy of the arc extinguishing device always effects the flashover arc energy; 2) the arc extinguishing sensitivity is not high, and the problem that an arc extinguishing device does not work under the condition of low-temperature arc exists; 3) the durability is poor, most arc extinguishing devices need gas generating materials to provide arc extinguishing conditions, and unnecessary consumption exists in extreme environments; 4) influenced by the operation mode, the arc extinguishing and lightning protection effects are poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art not enough, a novel trapezoidal arc extinguishing lightning protection device is proposed.
In order to achieve the above purpose, the technical solution of the present invention is as follows:
a novel trapezoidal arc extinguishing lightning protection device mainly comprises an arc extinguishing body and an electrode; the lower end of the arc-extinguishing body is open, the interior of the arc-extinguishing body is hollow, and a plurality of insulating partition plates are arranged along the longitudinal direction of the arc-extinguishing body, so that a plurality of independent backflushing perfusion arc-extinguishing cavities are formed in the arc-extinguishing body; a recoil device is arranged in each recoil pouring arc extinguishing cavity and is arranged in a spiral step arrangement mode inside the arc extinguishing body; wall electrodes are arranged on the insulating partition board between every two adjacent backflushing devices, the top of the backflushing device positioned below is connected with one surface of the wall electrode, and the bottom of the backflushing device positioned above is connected with the other surface of the wall electrode, so that the backflushing devices are sequentially electrically connected together end to end; the top of the uppermost backflushing device is connected to an electrode.
The utility model discloses in, the recoil device is the spiral echelonment and arranges to only one recoil device in every recoil pouring arc extinguishing chamber, can carry out the recoil arc extinguishing to electric arc in proper order, set up the wall electrode moreover, can inject the flashover route of electric arc.
The utility model further explains that the recoil device mainly comprises a recoil pipe and a lightning receptor; one end of the recoil pipe is opened, and the other end of the recoil pipe is fixedly provided with the lightning receptor, so that the recoil device becomes a semi-closed pipe fitting which is hollow inside and is opened at one end and closed at the other end; the lightning receptor is connected with the adjacent wall electrode. The opening direction of the recoil device is consistent with the opening direction of the arc extinguishing body.
The utility model further explains that the opening of the back flushing pipe is provided with a guide arc ring; the arc guide ring is connected with the adjacent wall electrode.
The utility model discloses explain further, the transversal honeycomb structure of personally submitting of arc extinguishing body.
The utility model discloses explain further, wall electrode adopt and lead arc electrode piece or compression arc-extinguishing tube. The inside of compression arc-extinguishing pipe be equipped with the arc guide ball. The compression arc-extinguishing tube adopts a ceramic tube.
The utility model discloses in the practical application in-process, novel trapezoidal arc extinguishing lightning protection device install the both ends at insulator chain relatively through link fitting respectively to there is air gap between these two novel trapezoidal arc extinguishing lightning protection devices. Or the novel trapezoidal arc extinguishing lightning protection device is installed at the low-voltage end of the insulator string through the connecting hardware fitting, the high-voltage end of the insulator string is provided with the high-voltage electrode of the novel trapezoidal arc extinguishing lightning protection device, and an air gap exists between the novel trapezoidal arc extinguishing lightning protection device and the high-voltage electrode. When in use, the bottom opening of the novel trapezoidal arc-extinguishing lightning protection device is arranged downwards, so that rainwater or dust can be prevented from entering the interior of the arc-extinguishing body; therefore, when the novel trapezoidal arc-extinguishing lightning-protection device is installed at the high-voltage end of the insulator string, the bottom of the novel trapezoidal arc-extinguishing lightning-protection device is also provided with a high-voltage electrode, one end of the high-voltage electrode is electrically connected with the lowest recoil device inside the arc-extinguishing body, and the other end of the high-voltage electrode is electrically connected with the high-voltage end of the insulator string.
The utility model discloses explain further, arc extinguishing body inner wall mainly constitute with non-conductive material of high strength, strong withstand voltage, for example non-conductive material such as cermet, tombarthite pottery, graphite alkene-ceramic composite, organic pottery. The insulating partition plate is made of a high-strength and strong-pressure-resistant non-conductive material, such as synthetic silicon rubber, rare earth glass, graphene glass and the like. The wall electrode material is a metal or nonmetal with strong conductivity, such as copper, aluminum, tungsten, nickel, iron, graphite and the like.
The technical principle of the utility model is as follows:
this arc extinguishing lightning protection device connects in parallel beside the insulator chain, and the centre is flashover air channel, and through insulating cooperation, the thunderbolt overvoltage that produces when thunderbolt shaft tower or lightning conductor breaks down the parallel connection passageway preferentially and protects the insulator chain, and the electric arc that forms gets into novel trapezoidal arc extinguishing lightning protection device.
The electric arc is a plasma with elastic deformation, after the electric arc enters the backflushing device through the arc guide ring, due to the limitation of the backflushing pipe wall, when the electric arc enters the initial end of the backflushing pipe, the density, the speed and the temperature are increased, so that the pressure in the pipe is increased, finally, a pressure explosion effect is generated, the electric arc impacts a lightning receptor at the bottom of the backflushing pipe, the electric arc is subjected to reverse elasticity at the bottom of the blocked backflushing pipe, the advancing direction of most of the electric arc is changed by 180 degrees, and the rebounded electric arc acts on an outer electric arc at an inlet due to the fact that the speed, the density and the pressure are larger, so that the electric arc at. The rest part of the electric arc enters the next recoil pipe due to the coulomb force of the wall electrode, and the process is repeated.
The back-flushing pipe in this patent is a narrow pipe filling channel, which is the only channel for the electric arc to enter the device. A variety of physical changes occur during perfusion.
1. The arc plasma is elastically deformed. When the arc plasma enters the inlet of the back flushing pipe, the physical shape is changed firstly, a coarse arc is changed into an ultrafine arc, the radial pressure is changed into the axial pressure, and the spraying speed is accelerated during the arc back flushing due to the back flushing effect of the narrow pipe.
2. The arc temperature rise effect is exacerbated. After the electric arc is thinned, the cross-sectional area of the electric arc is reduced according to the formula
The arc resistance will increase substantially. Because the lightning arc is often used as a constant current source in practical experience work according to a formula
It is known that although the impact time is only a few microseconds, the overall energy increases and the packing temperature in the recoil tube increases.
Arc radiation, convection and conduction are three ways of energy loss, and because heat cannot be released in a closed pipeline, namely an exogenous plugging environment, the arc is blocked, heat can be generated only, heat dissipation cannot be realized, so that blocking temperature rise can be generated, and the temperature in the pipeline is continuously increased.
3. The pressure explosion effect increases sharply. When the temperature is gradually increased, the accumulation of the electric arc is increased, the pressure explosion effect is further aggravated, and the electric arc spraying strength is larger.
When electric arc gets into the recoil device from the arrester, because the recoil pipe is very thin, thick thunder and lightning electric arc can be deformed into slender electric arc when getting into the recoil pipe, is full of whole pipeline, and the pipeline can produce the effort to electric arc and finally can form the pressure and explode the effect, blocks passing through of follow-up electric arc, produces the arc and cuts. And a small part of electric arc enters the next recoil pipe under the coulomb force action of the arc guide ring and the arc guide piece, and the process is repeated.
In contrast to multiple chambers
(1) And (5) the durability is compared. The gas production material added into the multi-cavity needs to be baked at high temperature to produce gas, so that the gas production material in the multi-cavity arc extinguishing device is consumed in a high-temperature environment, and the durability of the multi-cavity is poor; and the utility model discloses a potting material do not have consumption factor, need not pass through gas production mechanism arc extinguishing, the utility model discloses the durability is better.
(2) And (5) arc extinguishing effect comparison. When electric arcs pass through every two adjacent electrodes in the multi-cavity chamber, a condensation polar effect is generated, namely the temperature of the electric arcs under the adjacent electrodes is low, gas production effect is poor due to baking of gas production materials by low-temperature electric arcs, and arc extinguishing effect is poor due to contradiction between the condensation polar effect and arc extinguishing formed by baking of gas production at high temperature; and the utility model discloses a be that the throat pours the mechanism into, the electric arc collision produces huge arc extinguishing energy, utilizes electric arc self energy and collision arc extinguishing, makes the arc extinguishing effect splendid.
(3) And (5) comparing arc extinguishing sensitivity. According to the durability and the arc extinguishing effect, as the durability of the multi-cavity is influenced by high temperature, the generated gas is influenced by the electrode condensation pole effect, namely the low-temperature arc baking capability is extremely low, the contradiction between the condensation pole effect and the high-temperature baked generated gas forming arc extinguishing is formed, the arc extinguishing effect is poor when a small arc passes through, the multi-cavity can only act correctly when a larger arc passes through the multi-cavity, and the relay protection action is caused by the circulation of the large arc, namely, a trip accident exists, so the arc extinguishing sensitivity of the multi-cavity is not ideal; and the utility model discloses no matter be big electric arc or little electric arc exist, only need electric arc to get into the utility model discloses will produce and fill the mechanism, sensitivity is higher.
(4) And comparing the operation modes. According to the sensitivity analysis, the action of the multi-cavity is influenced by external factors such as a system operation mode, short-circuit current and the like, and an arc extinguishing blind area exists, so that the multi-cavity lightning protection matching is very difficult; and the utility model discloses do not have external factors influence such as system operation mode, short-circuit current.
The utility model has the advantages as follows:
(1) an arc path is restrained and controlled, the arc is consistent with an arc extinguishing channel, and the harm of arc drift is eliminated;
(2) the back-flushing devices in the back-flushing perfusion arc-extinguishing cavities act on the electric arcs to realize mutual isolation of different electric arc sections, and the electric arcs are cut off at the flashers in each back-flushing device and are not easy to re-ignite;
(3) the wall electrode in the insulating partition board can effectively disperse the energy of the electric arc, so that the whole electric arc is broken into zero;
(4) the recoil device in the recoil perfusion arc extinguishing cavity is not influenced by temperature and electrodynamic force in the arc extinguishing process, and the arc extinguishing sensitivity is high;
(5) the electric arc is extinguished in the impact arc extinguishing section and destroys the power frequency arc establishing channel, and the relay protection device is ensured not to be perceived;
(6) the novel trapezoidal arc extinguishing lightning protection device has wide application range, and is not influenced by the arrangement of wires, tower type and polarity effect
(7) The lightning protection device is effectively prevented from flashover, the lightning trip-out rate of the power equipment is reduced, the power facilities are protected, the reliability of a power grid is improved, and the power safety production is facilitated.
Drawings
Fig. 1 is a schematic view of an installation structure of the trapezoidal arc-extinguishing lightning protection device of the present invention;
FIG. 2 is an expanded view of the internal partial structure of the trapezoidal arc-extinguishing lightning protection device of the present invention;
FIG. 3 is a schematic cross-sectional view of the trapezoidal arc-extinguishing lightning protection device of the present invention;
fig. 4 is a schematic structural view of the recoil device of the present invention.
Wherein, each icon and the corresponding part name are as follows:
1-arc extinguishing body, 2-electrode, 3-insulating partition board, 4-backflushing perfusion arc extinguishing cavity, 5-backflushing device, 6-wall electrode, 51-backflushing tube, 52 lightning receptor and 511-arc conducting ring.
Detailed Description
The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings.
Example 1:
as shown in fig. 2-4, a novel trapezoidal arc extinguishing lightning protection device mainly comprises an arc extinguishing body 1 and an electrode 2; the lower end of the arc extinguishing body 1 is open, the interior of the arc extinguishing body 1 is hollow, and a plurality of insulating partition plates 3 are arranged along the longitudinal direction of the arc extinguishing body 1, so that a plurality of independent backflushing perfusion arc extinguishing cavities 4 are formed in the arc extinguishing body 1; a backflushing device 5 is arranged in each backflushing pouring arc extinguishing cavity 4, and the backflushing devices 5 are arranged in a spiral step arrangement mode in the arc extinguishing body 1; the wall electrodes 6 are arranged on the insulating partition plates 3 between every two adjacent backflushing devices 5, the top of the backflushing device 5 positioned below is connected with one surface of the wall electrode 6, and the bottom of the backflushing device 5 positioned above is connected with the other surface of the wall electrode 6, so that the backflushing devices 5 are sequentially electrically connected end to end; the top of the uppermost backflushing device 5 is connected to the electrode 2.
The backflushing device 5 mainly comprises a backflushing pipe 51 and a lightning receptor 52; one end of the recoil pipe 51 is open, and the other end is fixedly provided with the lightning receptor 52, so that the recoil device 5 becomes a semi-closed pipe fitting with a hollow interior, an open end and a closed end; the lightning receptor 52 is connected to the adjacent wall electrode 6. An opening of the recoil pipe 51 is provided with an arc guide ring 511; the arc guiding ring 511 is connected with the adjacent wall electrode 6.
The cross section of the arc extinguishing body 1 is of a honeycomb structure.
The wall electrode 6 adopts an arc-conducting electrode plate.
Example 2:
this example differs from example 1 in that: the wall electrode 6 adopts a compression arc-extinguishing tube.
Example 3:
this example differs from example 2 in that: the inside of compression arc-extinguishing pipe be equipped with the arc guide ball.
In practical application, as shown in fig. 1, the novel trapezoidal arc extinguishing lightning protection device of the present embodiment can be relatively installed at two ends of the insulator string through the connecting hardware fitting respectively, and an air gap exists between the two novel trapezoidal arc extinguishing lightning protection devices. The middle of the device is a flashover air channel, lightning overvoltage generated during lightning striking of a tower or a lightning conductor preferentially breaks down a parallel channel to protect an insulator string through insulation matching, and formed electric arc enters the novel trapezoidal arc extinguishing and lightning protection device.
When lightning strikes on a transmission line or a circuit to generate induced lightning overvoltage, lightning current at a high-voltage end of a lightning protection device is caused to start passing through a high-voltage end electrode, an electric arc can be pulled to enter the inside of a backflushing pouring arc extinguishing cavity of the device through the high-voltage end electrode, after the electric arc enters the backflushing device 5, the electric arc is limited by a backflushing pipe wall, when the electric arc enters the initial end of a backflushing pipe 51, the density, the speed and the temperature are increased, the pressure in the pipe is increased, finally, a pressure explosion effect is generated, the electric arc impacts a flashover 52 at the bottom of the backflushing pipe, the electric arc is subjected to reverse elasticity at the bottom of the blocked backflushing pipe 51, the advancing direction of most of the electric arc is changed by 180 degrees, and the rebounding electric arc at a port is subjected to. A small portion of the arc enters the next recoil tube 51 due to the coulomb force of the wall electrode and the process is repeated.
When thunderbolt shaft tower or transmission line lightning conductor, cause lightning protection device flashover low-voltage end to begin to have lightning current to pass through low pressure end electrode, inside electric arc can draw the recoil pouring arc extinguishing chamber 4 that gets into this device through low pressure end electrode, because the internal diameter is very little in recoil pipe 51, thick lightning electric arc can be deformed into slender electric arc when getting into recoil pipe 51, be full of whole pipeline, the pipeline can produce the effect of exploding by the final formation pressure of effort to electric arc, block passing through of follow-up electric arc, produce the truncation to electric arc. The remaining portion of the arc enters the next recoil tube 51 due to the coulomb force of the arc guiding ring and wall electrode, and the process is repeated.
Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A novel trapezoidal arc extinguishing lightning protection device mainly comprises an arc extinguishing body (1) and an electrode (2); the method is characterized in that: the lower end of the arc extinguishing body (1) is open, the interior of the arc extinguishing body is hollow, and a plurality of insulating partition plates (3) are longitudinally arranged along the arc extinguishing body (1) to enable a plurality of independent backflushing filling arc extinguishing cavities (4) to be formed in the arc extinguishing body (1); a recoil device (5) is arranged in each recoil pouring arc extinguishing cavity (4), and the recoil devices (5) are arranged in a spiral step arrangement mode in the arc extinguishing body (1); wall electrodes (6) are arranged on the insulating partition plates (3) between every two adjacent backflushing devices (5), the top of the backflushing device positioned below is connected with one surface of the wall electrode, and the bottom of the backflushing device positioned above is connected with the other surface of the wall electrode, so that the backflushing devices are sequentially electrically connected together end to end; the top of the recoil device at the uppermost end of the arc extinguishing body is connected with the electrode (2).
2. The novel trapezoidal arc extinguishing lightning protection device according to claim 1, characterized in that: the backflushing device (5) mainly comprises a backflushing pipe (51) and a lightning receptor (52); one end of the recoil pipe (51) is opened, and the other end of the recoil pipe is fixedly provided with the lightning receptor (52), so that the recoil device (5) becomes a semi-closed pipe fitting which is hollow inside, and is opened at one end and closed at the other end; the lightning receptor (52) is connected with the adjacent wall electrode (6).
3. The novel trapezoidal arc extinguishing lightning protection device according to claim 2, characterized in that: an opening of the recoil pipe (51) is provided with an arc guide ring (511); the arc guiding ring (511) is connected with the adjacent wall electrode (6).
4. The novel trapezoidal arc extinguishing lightning protection device according to claim 1, characterized in that: the cross section of the arc extinguishing body (1) is of a honeycomb structure.
5. The novel trapezoidal arc extinguishing lightning protection device according to claim 1, characterized in that: the wall electrode (6) adopts an arc guide electrode plate or a compression arc extinguishing tube.
6. The novel trapezoidal arc extinguishing lightning protection device according to claim 5, characterized in that: the inside of compression arc-extinguishing pipe be equipped with the arc guide ball.
7. The novel trapezoidal arc extinguishing lightning protection device according to claim 1, characterized in that: the novel trapezoidal arc-extinguishing lightning protection devices are respectively and relatively installed at two ends of the insulator string through the connecting hardware fitting, and an air gap exists between the two novel trapezoidal arc-extinguishing lightning protection devices.
8. The novel trapezoidal arc extinguishing lightning protection device according to claim 7, characterized in that: when the novel trapezoidal arc-extinguishing lightning-protection device is installed at the high-voltage end of the insulator string, the bottom of the novel trapezoidal arc-extinguishing lightning-protection device is also provided with a high-voltage electrode, one end of the high-voltage electrode is electrically connected with the lowest recoil device inside the arc-extinguishing body, and the other end of the high-voltage electrode is electrically connected with the high-voltage end of the insulator string.
9. The novel trapezoidal arc extinguishing lightning protection device according to claim 1, characterized in that: novel trapezoidal arc extinguishing lightning protection device install the low pressure end at insulator chain through link fitting, directional novel trapezoidal arc extinguishing lightning protection device's high-voltage electrode is installed to insulator chain's high-voltage end to there is air gap between novel trapezoidal arc extinguishing lightning protection device and the high-voltage electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920515121.8U CN210326483U (en) | 2019-04-16 | 2019-04-16 | Novel trapezoidal arc extinguishing lightning protection device |
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| CN201920515121.8U CN210326483U (en) | 2019-04-16 | 2019-04-16 | Novel trapezoidal arc extinguishing lightning protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111834895A (en) * | 2019-04-16 | 2020-10-27 | 段小嬿 | A new trapezoidal arc extinguishing and lightning protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111834895A (en) * | 2019-04-16 | 2020-10-27 | 段小嬿 | A new trapezoidal arc extinguishing and lightning protection device |
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