CN210575306U - Novel trapezoidal double-pole arc extinguishing insulator - Google Patents
Novel trapezoidal double-pole arc extinguishing insulator Download PDFInfo
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- CN210575306U CN210575306U CN201920515120.3U CN201920515120U CN210575306U CN 210575306 U CN210575306 U CN 210575306U CN 201920515120 U CN201920515120 U CN 201920515120U CN 210575306 U CN210575306 U CN 210575306U
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Abstract
The utility model discloses a novel trapezoidal double-pole arc-extinguishing insulator, which mainly comprises an insulator main body, an upper electrode and a lower electrode; the insulator main body is hollow and is provided with a plurality of insulating partition plates so that a plurality of independent backflushing pouring arc extinguishing chambers are formed in the insulator main body; each backflushing pouring arc extinguishing cavity is internally provided with a backflushing device which is arranged in a stepped spiral mode in the insulator main body, the backflushing openings of every two adjacent backflushing devices are opposite in direction, a wall electrode is arranged on an insulating partition plate between every two adjacent backflushing devices, the top of the backflushing device located below is connected with one surface of the wall electrode, and the bottom of the backflushing device located above is connected with the other surface of the wall electrode. The utility model discloses effectively prevent lightning protection device flashover problem, reduce power equipment thunderbolt tripping operation rate, protection electric power facility improves the electric wire netting reliability, is favorable to electric power safety in production.
Description
Technical Field
The utility model belongs to the insulator that power transmission and distribution overhead line used relates to a novel trapezoidal bipolar arc extinguishing insulator.
Background
The insulator is a special insulating control and can play an important role in an overhead transmission line. Early-age insulators are mostly used for telegraph poles, and a plurality of disc-shaped insulators are hung at one end of a high-voltage wire connecting tower which is gradually developed, are used for increasing creepage distance and are usually made of glass or ceramics. The insulator should not fail due to various electromechanical stresses caused by changes in environmental and electrical loading conditions, otherwise the insulator will not function significantly and will compromise the service and operational life of the entire line.
The main function of the insulator is to achieve electrical insulation and mechanical fixation, for which various electrical and mechanical properties are specified. The method aims at the aspects of development, process, materials, test method, aging problem, mechanical property, brittle failure problem, umbrella group digging, high altitude problem and the like of the composite insulator, wherein the aging problem seriously affects the lightning resistance level of a power transmission line, and the insulator generates flashover and generates single-phase short circuit fault to cause a trip accident under the serious condition.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a novel trapezoidal bipolar arc extinguishing insulator to the ageing electric arc edgewise flashover problem that promotes of insulator that exists among the prior art.
In order to achieve the above purpose, the technical solution of the present invention is as follows:
a novel trapezoidal double-pole arc extinguishing insulator mainly comprises an insulator main body, an upper electrode and a lower electrode; the upper end and the lower end of the insulator main body are both provided with openings, the interior of the insulator main body is hollow, and a plurality of insulating partition plates are longitudinally arranged along the insulator main body, so that a plurality of independent backflushing pouring arc extinguishing chambers are formed in the insulator main body; each backflushing pouring arc extinguishing cavity is provided with a backflushing device, the backflushing devices are arranged in the insulator main body in a stepped spiral mode, and the backflushing openings of every two adjacent backflushing devices are opposite in direction (namely the backflushing devices in the insulator main body are arranged in the same direction at intervals); wall electrodes are arranged on the insulating partition plate 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; the top of the backflushing device at the uppermost end of the insulator main body is connected with the upper electrode, and the bottom of the backflushing device at the lowermost end of the insulator main body is connected with the lower 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. Simultaneously, with two liang of adjacent recoil device's recoil opening opposite settings, no matter thunder arc from the top down flashover or from the bottom up flashover, the utility model discloses can both carry out effectual recoil arc extinguishing to 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 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 insulator main part.
Further, a plurality of skirt edges are arranged on the outer surface of the novel trapezoidal double-pole arc-extinguishing insulator. The skirt edge is added outside the device structure, the creepage distance is enhanced, and electric arc creeping discharge is avoided.
The utility model discloses explain further, novel trapezoidal bipolar arc extinguishing insulator pass through link fitting fixed mounting on the cross arm or overhead conductor.
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 further illustrates that the inner wall of the insulator main body is mainly made of high-strength and strong-pressure-resistant non-conductive materials, such as alloy ceramics, rare earth ceramics, graphene-ceramic composite materials, organic ceramics and other non-conductive materials; 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 other non-conductive materials; 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 novel trapezoidal bipolar arc extinguishing insulator is installed on the horizontal pole or overhead conductor, is flashover air channel in the middle of this trapezoidal bipolar arc extinguishing insulator, through insulating cooperation, among the arc extinguishing device in trapezoidal bipolar arc extinguishing insulator interior was got into to the electric arc that the thunderbolt overvoltage that produces when thunderbolt shaft tower or lightning conductor formed.
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 and beneficial effect 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 assembly and are not easy to re-ignite;
(3) the wall electrode in the clapboard outside the back-flushing pouring arc extinguishing cavity can effectively disperse the energy of the electric arc, so that the whole electric arc is broken into parts;
(4) the recoil device in the recoil perfusion arc extinguishing cavity is not influenced by temperature and electrodynamic force in the arc extinguishing process; 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 utility model discloses can directly replace insulator chain on the transmission line, not only possess original insulating function, still have lightning protection arc extinguishing function, application range is wide, does not receive the wire to arrange, shaft tower type, polarity effect influence.
(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 the installation structure of the trapezoidal bipolar arc extinguishing insulator of the present invention;
fig. 2 is a schematic view of the internal partial structure of the trapezoidal bipolar arc-extinguishing insulator of the present invention;
fig. 3 is a schematic cross-sectional structure diagram of the trapezoidal bipolar arc-extinguishing insulator 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-insulator main body, 2-upper electrode, 3-lower electrode, 4-insulating partition board, 5-backflushing pouring arc extinguishing chamber, 6-backflushing device, 7-wall electrode, 8-skirt edge, 61-backflushing tube, 62 lightning arrester, 611-arc guide 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 the figure, the novel trapezoidal double-pole arc-extinguishing insulator mainly comprises an insulator main body 1, an upper electrode 2 and a lower electrode 3; the upper end and the lower end of the insulator main body 1 are both provided with openings, the interior of the insulator main body 1 is hollow, and a plurality of insulating partition plates 4 are longitudinally arranged along the insulator main body 1, so that a plurality of independent backflushing pouring arc extinguishing chambers 5 are formed in the insulator main body 1; a recoil device 6 is arranged in each recoil filling arc extinguishing cavity 5, the recoil devices 6 are arranged in the insulator main body 1 in a stepped spiral mode, and the directions of recoil openings of the recoil devices 6 adjacent to each other in pairs are opposite; the wall electrodes 7 are arranged on the insulating partition plates 4 between every two adjacent backflushing devices 6, the top of the backflushing device positioned below is connected with one surface of the wall electrode 7, and the bottom of the backflushing device positioned above is connected with the other surface of the wall electrode 7; the top of the backflushing device at the uppermost end of the insulator main body 1 is connected with the upper electrode 2, and the bottom of the backflushing device at the lowermost end of the insulator main body 1 is connected with the lower electrode 3.
The backflushing device 6 mainly comprises a backflushing pipe 61 and a lightning receptor 62; one end of the recoil pipe 61 is open, and the other end is fixedly provided with a lightning receptor 62, so that the recoil device 6 becomes a semi-closed pipe fitting with a hollow interior, an open end and a closed end; the lightning receptor 62 is connected to the adjacent wall electrode 7.
An opening of the recoil pipe 61 is provided with an arc guide ring 611; the arc guiding ring 611 is connected with the adjacent wall electrode 7.
The cross section of the insulator main body 1 is of a honeycomb structure.
The novel trapezoidal double-pole arc extinguishing insulator is fixedly installed on the cross arm or the overhead conductor through a connecting hardware fitting.
The wall electrode 7 adopts an arc-conducting electrode plate.
Example 2:
this example differs from example 1 in that: the outer surface of the insulator main body 1 is provided with a plurality of skirt edges 8.
Example 3:
this example differs from example 1 in that: the wall electrode 7 adopts a compression arc extinguishing tube.
Example 4:
this example differs from example 3 in that: the inside of compression arc-extinguishing pipe be equipped with the arc guide ball.
In the practical application process, the novel trapezoidal double-pole arc-extinguishing insulator is arranged on a cross rod or an overhead conductor, and an electric arc formed by lightning overvoltage generated when a tower or a lightning conductor is struck by lightning enters an arc-extinguishing device in the trapezoidal double-pole arc-extinguishing insulator.
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 to pass through a high-voltage electrode, an electric arc can be pulled by the high-voltage electrode to enter the device to be backflushed into an arc extinguishing chamber 5, after the electric arc enters a backflushing device 6, the electric arc is limited by a backflushing pipe wall, the density, the speed and the temperature are increased to cause the increase of the pressure in the pipe and finally generate a pressure explosion effect, the electric arc impacts a flasher 62 at the bottom of the backflushing pipe 61, 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 is subjected to external electric arc at an inlet due to the fact that the speed, the density and the pressure. And a small part of electric arc enters the next recoil pipe 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 the low-voltage electrode, the electric arc can draw through the low-voltage electrode and get into this device recoil filling arc-extinguishing chamber 5 inside, because the inside diameter is very little in the recoil pipe device 6, thick 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 effect of exploding by the pressure that can finally form to the electric arc, blocks passing through of follow-up electric arc, produces the arc and cuts. The remaining portion of the arc enters the next recoil tube due to the coulomb force of the arc runner 71 and the arc runner, 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 (8)
1. A novel trapezoidal double-pole arc extinguishing insulator mainly comprises an insulator main body (1), an upper electrode (2) and a lower electrode (3); the method is characterized in that: the upper end and the lower end of the insulator main body (1) are provided with openings, the interior of the insulator main body is hollow, and a plurality of insulating partition plates (4) are longitudinally arranged along the insulator main body (1) to form a plurality of independent backflushing pouring arc extinguishing chambers (5) in the insulator main body (1); each backflushing pouring arc extinguishing cavity (5) is internally provided with a backflushing device (6), the backflushing devices (6) are arranged in the insulator main body (1) in a stepped spiral mode, and the backflushing opening directions of every two adjacent backflushing devices (6) are opposite; wall electrodes (7) are arranged on the insulating partition plates (4) between every two adjacent backflushing devices (6), one surface of each wall electrode (7) is connected with the top of the backflushing device positioned below, and the other surface of each wall electrode is connected with the bottom of the backflushing device positioned above; the top of the backflushing device at the uppermost end of the insulator main body (1) is connected with the upper electrode (2), and the bottom of the backflushing device at the lowermost end of the insulator main body (1) is connected with the lower electrode (3).
2. The novel trapezoidal bipolar arc-extinguishing insulator according to claim 1, is characterized in that: the backflushing device (6) mainly comprises a backflushing pipe (61) and a lightning receptor (62); one end of the recoil pipe (61) is opened, and the other end of the recoil pipe is fixedly provided with the lightning receptor (62), so that the recoil device (6) 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 (62) is connected with the adjacent wall electrode (7).
3. The novel trapezoidal bipolar arc-extinguishing insulator according to claim 2, characterized in that: an opening of the backflushing pipe (61) is provided with an arc guiding ring (611); the arc guiding ring (611) is connected with the adjacent wall electrode (7).
4. The novel trapezoidal bipolar arc-extinguishing insulator according to claim 1, is characterized in that: the cross section of the insulator main body (1) is of a honeycomb structure.
5. The novel trapezoidal bipolar arc-extinguishing insulator according to claim 1, is characterized in that: the outer surface of the insulator main body (1) is provided with a plurality of skirt edges (8).
6. The novel trapezoidal bipolar arc-extinguishing insulator according to claim 1, is characterized in that: the novel trapezoidal double-pole arc extinguishing insulator is fixedly installed on the cross arm or the overhead conductor through a connecting hardware fitting.
7. The novel trapezoidal bipolar arc-extinguishing insulator according to claim 1, is characterized in that: the wall electrode (7) adopts an arc guide electrode plate or a compression arc extinguishing tube.
8. The novel trapezoidal bipolar arc-extinguishing insulator according to claim 7, is characterized in that: the inside of compression arc-extinguishing pipe be equipped with the arc guide ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920515120.3U CN210575306U (en) | 2019-04-16 | 2019-04-16 | Novel trapezoidal double-pole arc extinguishing insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920515120.3U CN210575306U (en) | 2019-04-16 | 2019-04-16 | Novel trapezoidal double-pole arc extinguishing insulator |
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| Publication Number | Publication Date |
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| CN210575306U true CN210575306U (en) | 2020-05-19 |
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|---|---|---|---|
| CN201920515120.3U Active CN210575306U (en) | 2019-04-16 | 2019-04-16 | Novel trapezoidal double-pole arc extinguishing insulator |
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| CN (1) | CN210575306U (en) |
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- 2019-04-16 CN CN201920515120.3U patent/CN210575306U/en active Active
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