CN209981722U - Compact self-energy type gap arc extinguishing lightning protection device - Google Patents
Compact self-energy type gap arc extinguishing lightning protection device Download PDFInfo
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- CN209981722U CN209981722U CN201921141378.8U CN201921141378U CN209981722U CN 209981722 U CN209981722 U CN 209981722U CN 201921141378 U CN201921141378 U CN 201921141378U CN 209981722 U CN209981722 U CN 209981722U
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Abstract
The utility model relates to the technical field of overvoltage protection devices, in particular to a compact self-energy gap arc extinguishing lightning protection device which is applied to the protection work of lightning overvoltage of a distribution network line; the lightning protection device consists of an upper arm, a lower arm and an air gap formed by the upper arm and the lower arm; the upper arm is composed of a transverse arm and a longitudinal arm which are connected with each other at the end parts, the transverse arm and the longitudinal arm are composed of a plurality of arc extinguishing chamber units which are connected in series and spherical electrodes packaged in the arc extinguishing chamber units, each arc extinguishing chamber unit is a cylindrical insulating shell, two hemispherical chambers are embedded in the shell, a communicated gap is formed between the chambers, one end of the gap is communicated with the outer wall of the shell, and the gap is gradually reduced from the gap to the outer wall of the shell to form a conical channel; the utility model discloses have excellent ability of extinguishing power frequency afterflow electric arc, the structure is compacter, and is small, and the breaking current is bigger, and the arc extinguishing performance is more stable, improves circuit operational reliability and security.
Description
Technical Field
The utility model relates to an overvoltage protection device technical field, concretely relates to compact self-energy formula clearance arc extinguishing lightning protection device applies to the protection work who joins in marriage net twine way thunder and lightning overvoltage.
Background
When thundercloud discharges to ground, the electromagnetic field of the space around the discharge channel changes rapidly, and induced overvoltage is generated on the overhead line nearby. The thundercloud may even hit the distribution overhead lines directly, generating extremely high lightning overvoltages. When the lightning overvoltage exceeds a certain value, flashover and even disconnection of a distribution line can be caused, so that the power supply network is damaged, and the power supply reliability of a power distribution system is directly influenced. Therefore, it is necessary to take a preventive measure against the lightning overvoltage of the medium voltage distribution network system. At present, the protection measures adopted for lightning overvoltage of a medium-voltage distribution network system mainly comprise two types: the blocking type protection measures can be divided into improving the lightning withstand insulation characteristic of a distribution line, adopting an overhead ground wire to intercept direct lightning, reducing induced overvoltage on a lead and installing a line lightning arrester to clamp overvoltage at two ends of a protected insulator; the basic principle of the dredging type protection measure is to dredge electric arcs and prevent the electric arcs from burning wires. Including extending the flashover path, partially stripping the insulated conductor, employing parallel protection gaps, etc.
The multistage semi-closed self-energy arc extinguishing chamber series structure has excellent arc extinguishing performance, and the problem of lightning protection of the distribution network at present can be effectively solved by applying the structure on a distribution line. However, the existing equipment has simple arc extinguishing chamber structure and limited current interruption capability, so that the device has large volume and is difficult to install; moreover, matching problems still exist when different lines are installed and shipped, and the reliability and the safety of the matching problems need to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art exists not enough, based on multistage semi-closed self energy formula arc extinguishing cavity structure and join in marriage the concrete operational aspect of net twine way, provided a compact self energy formula clearance arc extinguishing lightning protection device. Compared with the existing structure, the structure is more compact, the breaking current is larger, and the reliability and the safety of the line operation are improved.
The utility model discloses a realize through following technical scheme.
A compact self-energy gap arc extinguishing lightning protection device is composed of an upper arm, a lower arm and an air gap formed between the upper arm and the lower arm; the upper arm is formed by connecting one end of a transverse arm with one end of a longitudinal arm, one end of the transverse arm, which is far away from the longitudinal arm, is connected with the upper end of the insulator string, one end of the lower arm is connected with the lower end of the insulator string, and the air gap is formed between the other end of the lower arm and one end of the longitudinal arm, which is far away from the transverse arm; the lower arm is a metal rod; the horizontal arm and the vertical arm are composed of a plurality of arc extinguishing chamber units which are connected in series and spherical electrodes packaged in the arc extinguishing chamber units, each arc extinguishing chamber unit is a cylindrical insulating shell, two hemispherical chambers are embedded in the shell, a communicated gap is formed between the two hemispherical chambers, one end of the gap is communicated with the outer wall of the shell, and the gap is gradually reduced from the gap to the outer wall of the shell to form a conical channel; the plurality of arc extinguishing chamber units are connected to form a plurality of spherical chambers for placing the spherical electrodes.
Preferably, the lower arm is a galvanized steel bar.
Preferably, the length of the air gap is 30-100 mm.
Preferably, the cylindrical insulating shell is made of polylactic acid, and the radius of the bottom surface of the cylindrical insulating shell is 9-13 mm.
Preferably, the number of the spherical chambers in the upper arm is 80-150, and the density of the spherical chambers is arranged according to a normal distribution rule.
Preferably, the narrowest distance d of the gap is1=0.5-1.5mm, widest distance d2=3-5mm。
Preferably, the cone channel and the outer wall of the shell form a nozzle, and the opening diameter d of the nozzle3=1-2mm, height d of the cone channel4=5-7mm。
Preferably, the radius R =4-6mm of the spherical electrode.
A preparation method of a compact self-energy gap arc-extinguishing lightning protection device is characterized in that an arc-extinguishing chamber unit is processed and manufactured by a 3D printer and comprises the following steps:
a) software is used to build a geometric model of the series arrangement of arc-extinguishing chamber units.
b) And printing according to the geometric model by adopting a 3D printer by using polylactic acid as a raw material, temporarily printing when one arc extinguishing chamber unit is printed, embedding a spherical electrode into the hemispherical chamber, continuously printing the next arc extinguishing chamber unit on the arc extinguishing chamber unit embedded with the spherical electrode, and repeating the previous steps to form the transverse arm or the longitudinal wall.
c) The ends of the transverse arm and the longitudinal arm are connected through a bolt to form a 7-shaped upper arm.
In a further preferred scheme, the transverse arm and the lower arm are respectively connected with the insulator string through diamond-shaped buckles.
The utility model discloses produced beneficial effect does for prior art.
1) The utility model discloses a have multistage semi-airtight self energy formula arc extinguishing cavity series connection structure that has through 3D printing technique preparation, have the excellent ability of extinguishing power frequency afterflow electric arc, can effectively reduce the insulator problem of burning.
2) The utility model discloses adopted throat type spout structure to multi-chamber arc extinguishing series structure, compared existing structure, the structure is compacter, and the breaking current is bigger.
3) The utility model discloses in the self energy formula arc extinguishing type clearance that forms between spherical electrode, compare and have had the clearance, the device volume is less, easily installs, and the arc extinguishing performance is more stable, can realize "non-maintaining", improves circuit operational reliability and security.
4) From engineering design, economic convenience and line safety's angle, adopt the utility model provides a compact self-energy formula clearance arc extinguishing lightning protection device can effectively reduce the thunderbolt tripping operation accident of joining in marriage net twine way, improves the reliability and the security of circuit operation, has wide application prospect.
Drawings
Fig. 1 is a schematic structural view of the compact self-energy gap arc extinguishing lightning protection device of the present invention.
Fig. 2 is a side view of an arc extinguishing chamber unit according to the present invention.
FIG. 3 is a diagram of the arc chamber unit processing steps of the present invention, wherein a is a schematic of a 3D printed half arc chamber unit with bottom support columns; b is a schematic diagram of placing a spherical electrode in the hemispherical cavity; c is a schematic view of continuing to print the arc-extinguishing chamber unit on the spherical electrode using the 3D printer.
Fig. 4 is a schematic view of the connection of the transverse arm and the longitudinal arm of the upper arm of the present invention.
Fig. 5 is a schematic diagram of the connection hardware of the upper arm and the lower arm connected with the insulator string.
FIG. 6 is a graph of airflow velocity over time in the chambers of the two configurations described in the experimental examples.
In the figure, 1 is a lower arm, 2 is an air gap, 3 is a transverse arm, 4 is a longitudinal arm, 5 is an insulator string, 6 is a bolt, 7 is a diamond-shaped buckle, 8 is an arc extinguishing chamber unit, 9 is a spherical electrode, 801 is a hemispherical chamber, 802 is a gap, 803 is an outer wall, 804 is a cone channel, and 805 is a nozzle.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
Example 1
As shown in fig. 1, the compact self-energy gap arc extinguishing lightning protection device is composed of an upper arm and a lower arm 1 and an air gap 2 formed between the upper arm and the lower arm 1; as shown in fig. 4, the upper arm is formed by connecting one end of a transverse arm 3 with one end of a longitudinal arm 4 through a bolt 6, as shown in fig. 5, the other end of the transverse arm 3 is connected with the upper end of an insulator string 5 through a diamond-shaped buckle 7, one end of a lower arm 1 is connected with the lower end of the insulator string through the diamond-shaped buckle 7, and an air gap 2 is formed between the other end of the lower arm 1 and the other end of the longitudinal arm 4; the length of the air gap 2 is 60 mm; the lower arm 1 is formed from a galvanized steel bar and has a length of 700 mm.
The transverse arm 3 and the longitudinal arm 4 are composed of a plurality of arc extinguishing chamber units 8 connected in series and spherical electrodes 9 packaged in the arc extinguishing chamber units 8, as shown in fig. 2, each arc extinguishing chamber unit 8 is a cylindrical insulating shell, the insulating shell is made of polylactic acid, the radius of the bottom surface of the cylindrical shell is 12mm, two hemispherical chambers 801 are embedded in the shell, a communicated gap 802 is formed between the two hemispherical chambers 801, and the narrowest distance d of the gap 802 is1Is 1mm, the widest distance d2Is 4 mm. One end of the gap 802 is communicated with the outer wall 803 of the shell, and the direction from the gap 802 to the outer wall 803 is gradually reduced to form a conical channel 804; the cone passage 804 and the outer wall 803 form a nozzle 805, the opening diameter d of the nozzle 80531.5mm, height d of the conical channel 8044Is 6 mm. The arc extinguishing chamber units 8 are connected to form a plurality of spherical chambers for placing the spherical electrodes 9, the number of the spherical chambers in the upper arm is 120, and the density of the spherical chambers is set according to a normal distribution rule. Wherein the radius R of the spherical electrode 9 is 5 mm.
As shown in fig. 3, a method for manufacturing a compact self-energy gap arc extinguishing lightning protection device is to manufacture a transverse arm 3 and a longitudinal arm 4 by a 3D printer, connect the transverse arm 3 and the longitudinal arm 4 to form an upper arm, connect the upper arm to the upper end of an insulator string 5 by a bolt, and connect a lower arm 1 to the lower end of the insulator string 5, wherein the steps of manufacturing the transverse arm 3 and the longitudinal arm 4 by a 3D printer specifically include:
a) the geometric model of the transverse arm 3 and the longitudinal arm 4 formed by the series connection of the arc-extinguishing chamber units is established using model editing software.
b) Printing according to the geometric model by using a 3D printer with polylactic acid as a raw material, as shown in a in FIG. 3, starting from the bottom layer, printing a half arc-extinguishing chamber unit 8 with a supporting column at the bottom, then printing temporarily, as shown in b in FIG. 3, embedding a spherical electrode 9 into a hemispherical chamber 801, as shown in c in FIG. 3, then continuing to print the next arc-extinguishing chamber unit on the arc-extinguishing chamber unit 8 embedded with the spherical electrode 9, repeating the previous steps, wherein the printed transverse arm 3 has 45 spherical chambers, the printed longitudinal arm 4 has 75 spherical chambers, and the spherical chambers have spherical electrodes 9 encapsulated therein, and gaps 802 and nozzles 805 between the spherical electrodes 9 are formed simultaneously during printing.
c) The ends of the transverse arm 3 and the longitudinal arm 4 are connected through a bolt 6 to form a 7-shaped upper arm.
Experimental example 1
Further explain through simulation experiment and multi-chamber arc extinguishing structure quenching impulse arc test the utility model discloses a compact self-energy formula clearance arc extinguishing lightning protection device's implementation effect.
1. Simulation experiment
Utilize COMSOL mutiphics software to build the simulation model of semi-closed self energy formula arc extinguishing chamber structure, the motion characteristic of electric arc in the simulation analysis chamber is verified the utility model discloses the compact self energy formula clearance arc extinguishing lightning protection device's that embodiment 1 prepared effect of blowing arc extinguishing to embodiment 1 is experimental example A to conventional clearance arc extinguishing lightning protection device with no throat structure is as comparison example B.
As shown in FIG. 6, it is the curve of the change of the air flow velocity in the chamber with time in A, B two kinds of structures obtained from the simulation experiment, it is easy to see that the air flow velocity in the chamber with the necking structure of the utility model is obviously larger than the air flow velocity in the chamber with the original structure, and the arc extinguishing capability is good.
2. Quenching impact arc test with multi-cavity arc extinguishing structure
The existing test equipment in a high-voltage test room of Chongqing university is utilized to build an impact arc test platform of a semi-closed self-energy type arc extinguishing chamber, and an impact arc quenching test is carried out on a semi-closed self-energy type arc extinguishing chamber structure. And shooting the movement and extinguishing process of the impact arc sprayed out of the semi-closed self-energy arc extinguishing chamber by using a high-speed camera. The result shows that the semi-closed self-energy type arc extinguishing cavity structure adopted by the embodiment 1 of the utility model can blow out the arc in the cavity at 184.8 mus.
The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.
Claims (9)
1. A compact self-energy gap arc extinguishing lightning protection device is characterized by comprising an upper arm, a lower arm and an air gap formed between the upper arm and the lower arm; the upper arm is formed by connecting one end of a transverse arm with one end of a longitudinal arm, one end of the transverse arm, which is far away from the longitudinal arm, is connected with the upper end of the insulator string, one end of the lower arm is connected with the lower end of the insulator string, and the air gap is formed between the other end of the lower arm and one end of the longitudinal arm, which is far away from the transverse arm; the lower arm is a metal rod; the horizontal arm and the vertical arm are composed of a plurality of arc extinguishing chamber units which are connected in series and spherical electrodes packaged in the arc extinguishing chamber units, each arc extinguishing chamber unit is a cylindrical insulating shell, two hemispherical chambers are embedded in the shell, a communicated gap is formed between the two hemispherical chambers, one end of the gap is communicated with the outer wall of the shell, and the gap is gradually reduced from the gap to the outer wall of the shell to form a conical channel; the plurality of arc extinguishing chamber units are connected to form a plurality of spherical chambers for placing the spherical electrodes.
2. The compact self-energizing gap arc extinguishing lightning protection device of claim 1, wherein the lower arm is a galvanized steel bar.
3. The compact self-energizing gap-quenching lightning protection device of claim 1, wherein the air gap has a length of 30-100 mm.
4. The compact self-energizing gap arc extinguishing lightning protection device according to claim 1, wherein the radius of the bottom surface of the cylindrical insulating housing is 9-13 mm.
5. The compact self-energy gap arc extinguishing lightning protection device according to claim 1, wherein the number of the spherical cavities in the upper arm is 80-150, and the density of the spherical cavities is arranged according to a normal distribution rule.
6. The compact self-energizing gap-quenching lightning protection device of claim 1, wherein the narrowest distance d of the gap is1=0.5-1.5mm, widest distance d2=3-5mm。
7. The compact self-energizing gap arc extinguishing lightning protection device according to claim 1, wherein the cone channel and the outer wall of the housing form a nozzle opening, the opening diameter d of the nozzle opening3=1-2mm, height d of the cone channel4=5-7mm。
8. The compact self-energy gap arc extinguishing lightning protection device according to claim 1, wherein the radius R =4-6mm of the spherical electrode.
9. The compact self-energizing gap arc extinguishing lightning protection device according to claim 1, wherein the lateral arms and the lower arms are connected to the insulator string by diamond-shaped fasteners, respectively.
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| CN201921141378.8U CN209981722U (en) | 2019-07-19 | 2019-07-19 | Compact self-energy type gap arc extinguishing lightning protection device |
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| CN201921141378.8U CN209981722U (en) | 2019-07-19 | 2019-07-19 | Compact self-energy type gap arc extinguishing lightning protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416878A (en) * | 2019-07-19 | 2019-11-05 | 郭润生 | A kind of compact self extinguishing type gap arc extinguishing lightning protection device and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416878A (en) * | 2019-07-19 | 2019-11-05 | 郭润生 | A kind of compact self extinguishing type gap arc extinguishing lightning protection device and preparation method thereof |
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Effective date of registration: 20200318 Address after: 036002 shop 66, building 12, Fuyuan community, Youyi street, Shuocheng District, Shuozhou City, Shanxi Province Patentee after: Shanxi YaoYuan Electric Power Engineering Co., Ltd Address before: 036002 No. 23 Gubei Street, Shuozhou City, Shanxi Province Patentee before: Guo Runsheng |