CN110310790B - Lightning protection method for overhead line - Google Patents
Lightning protection method for overhead line Download PDFInfo
- Publication number
- CN110310790B CN110310790B CN201810254444.6A CN201810254444A CN110310790B CN 110310790 B CN110310790 B CN 110310790B CN 201810254444 A CN201810254444 A CN 201810254444A CN 110310790 B CN110310790 B CN 110310790B
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- Prior art keywords
- lightning protection
- disposable
- protection device
- overhead line
- lightning
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012212 insulator Substances 0.000 claims abstract description 36
- 239000004020 conductor Substances 0.000 claims abstract description 28
- 238000010891 electric arc Methods 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 4
- 239000007924 injection Substances 0.000 claims abstract description 4
- 238000009422 external insulation Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 208000025274 Lightning injury Diseases 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 241000282412 Homo Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
- H01B17/46—Means for providing an external arc-discharge path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
- H01B17/48—Means for obtaining improved distribution of voltage; Protection against arc discharges over chains or other serially-arranged insulators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
Abstract
The invention discloses a lightning protection method for an overhead line, which comprises the following steps of: a) Installing a disposable lightning protection device on one side of the insulator string; b) An air gap is formed between the discharge end of the disposable lightning protection device and the nearest point of conductors with different electric potentials, the length of an external insulating cylinder body of the disposable lightning protection device and the distance of the air gap are larger than the internal overvoltage gap of a circuit, and meanwhile, the distance of the air gap is smaller than the lightning protection voltage gap of an insulator string; c) When struck by lightning, the air gap forms an electric arc, the gas generating conductor of the disposable lightning protection device is melted by discharge current to generate an electric arc, and high-pressure gas is instantaneously generated in the disposable lightning protection device at the high temperature of the electric arc; d) The upper cover and/or the lower cover of the disposable lightning protection device are/is flushed under the impact of high-pressure gas, and the electric arc is extinguished under the injection of the high-pressure gas. The invention has good protection effect and lower cost.
Description
Technical Field
The invention relates to the technical field of lightning protection of transmission and distribution towers, in particular to a lightning protection method of an overhead line.
Background
Thunder and lightning are disastrous weather phenomena, often cause serious disasters and accidents, and cause great disasters and threats to natural environments and resources on which people and human beings depend and civilization created by the people, such as forest fires, lightning stroke casualties and the like. The great destructive nature of lightning disasters has not been controlled and prevented by humans to date. In the electric power system, lightning is a serious threat, equipment damage and line power failure are caused, power supply interruption is caused, and the power grid is paralyzed in some cases. The lightning stroke disasters in China are frequent, the disaster rate is high, and the disasters are serious.
The transmission line of the power system is exposed in the field and is extremely prone to lightning strike in thunderstorm seasons. For a long time, the lightning trip-out rate of the power transmission line in thunderstorm season is always high, and at present, about two thirds of faults of the power transmission line are caused by lightning, so that serious loss is caused by national economy, and great difficulty is brought to the power supply of the peak meeting degree Xia Bao.
At present, a zinc oxide arrester is often used for lightning protection for a lightning easy-to-strike pole tower of a power transmission line or a power distribution line. However, the zinc oxide lightning arrester has high cost and needs periodic tests to eliminate the fault to trigger the tripping of the circuit, so that the large-area popularization is not realized. However, a lightning strike tower trip is a small probability event, even in areas where the lightning strike density is far above average, the probability of a lightning strike causing a certain string of insulators to strike less than 0.5% during a thunderstorm season. The prior lightning arresters can automatically recover the initial electric connection state after lightning strike discharge, each lightning arrestor must be subjected to multiple lightning strikes without faults, otherwise, the short circuit result caused by the faults of the lightning arresters is more serious than the lightning strike result caused by the lightning arrestor without installation. The existing lightning arresters, if installed in large areas, will bring about a great deal of preventive test pressure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the overhead line lightning protection method which can protect the insulator and prevent tripping, actively quit operation after encountering one-time lightning strike discharge, recover the original lightning protection voltage gap insulation level of the insulator, realize lower cost and larger area use, greatly reduce the lightning strike tripping probability and reduce the operation and maintenance cost.
The technical scheme of the invention is as follows: a lightning protection method for an overhead line is characterized in that a disposable lightning protection device is arranged on an insulator string of the line, and the method comprises the following steps:
a) Installing the disposable lightning protection device on one side of the insulator string;
b) An air gap is formed between the discharge end of the disposable lightning protection device and the nearest point of conductors with different electric potentials, the length of an external insulating cylinder body of the disposable lightning protection device and the distance of the air gap are larger than the internal overvoltage gap of the circuit, and meanwhile, the distance of the air gap is smaller than the lightning protection voltage gap of the insulator string;
c) When the lightning protection device is in a lightning stroke, the air gap forms an electric arc, the gas generating conductor of the disposable lightning protection device is melted by discharge current to generate the electric arc, and high-pressure gas is instantaneously generated in the disposable lightning protection device at the high temperature of the electric arc;
d) The upper cover and/or the lower cover of the disposable lightning protection device are/is flushed away under the impact of the high-pressure gas, and the electric arc is extinguished under the injection of the high-pressure gas.
Preferably, the disposable lightning protection device is arranged on each insulator string of the overhead line.
In the step a), the connecting end of the disposable lightning protection device is arranged on the upper end/lower end metal accessories of the insulator string or symmetrically arranged on the upper end/lower end metal accessories of the insulator string.
In the step a), the connecting end of the disposable lightning protection device is installed through a connecting bracket.
In step b), the length of the gas generating conductor of the disposable lightning protection device is equal to or less than the length of the external insulating cylinder.
In the step b), the air gap is equal to 70-90% of the lightning protection voltage gap of the insulator string.
In step b), the disposable lightning protection device always keeps the distance of the air gap consistent through structural design.
In step c), the gas generating conductor of the disposable lightning protection device comprises a gas generating material and a conductive material.
In step d), the connection tightness of the upper cover and/or the lower cover of the disposable lightning protection device is smaller than the impact force of the high-pressure gas.
Optionally, the upper cover and/or the lower cover of the disposable lightning protection device and the external insulation cylinder are integrally formed or separately combined and formed.
Compared with the prior art, the invention has the beneficial effects that: according to the overhead line lightning protection method, the disposable lightning protection device is arranged on the insulator string of the line, when the overhead line is in a lightning stroke, the air gap is broken down preferentially, so that an electric arc is formed in the air gap, a gas generating conductor of the disposable lightning protection device is melted by discharge current to generate the electric arc, high-pressure gas is instantaneously generated in the disposable lightning protection device at high temperature of the electric arc, the high-pressure gas is flushed out from one end of the disposable lightning protection device to extinguish the electric arc, the possibility that the insulator string is broken down by lightning is avoided, tripping caused by lightning stroke is avoided, the purpose of safe lightning protection is achieved, the disposable lightning protection device is low in cost, the disposable lightning protection device is preferably arranged on each insulator string of the overhead line, the tripping probability can be greatly reduced, and the labor cost is greatly reduced by replacing the disposable lightning protection device after the operation in combination with comprehensive power failure maintenance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
fig. 1 is a flow chart of an overhead line lightning protection method according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of one implementation of an overhead line lightning protection method according to an embodiment of the present invention;
FIG. 3 is a schematic view illustrating an installation of the disposable lightning protection device according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of another embodiment of a disposable lightning protection device according to the present invention;
FIG. 5 is a second schematic view of another embodiment of the disposable lightning protection device according to the present invention;
FIG. 6 is a schematic diagram illustrating an installation of a disposable lightning protection device according to a second embodiment of the present invention;
FIG. 7 is a schematic view illustrating an installation of a disposable lightning protection device according to a third embodiment of the invention;
Fig. 8 is an installation schematic diagram of a disposable lightning protection device according to a fourth embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Embodiments of the application and features of the embodiments may be combined with each other without conflict. The application will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
Referring to fig. 1 to 3, the embodiment provides a lightning protection method for an overhead line, which includes the following steps of:
a) Installing the disposable lightning protection device 3 on one side of the insulator string 2;
b) An air gap 4 is formed between the discharge end of the disposable lightning protection device 3 and the point where conductors with different electric potentials are closest, and the length of an external insulating cylinder 5 of the disposable lightning protection device 3 and the distance of the air gap 4 are larger than the internal overvoltage gap of the circuit 1 and smaller than the lightning protection voltage gap of the insulator string 2;
c) When being struck, the air gap 4 forms an electric arc, the gas generating conductor 6 of the disposable lightning protection device 3 is melted by discharge current to generate the electric arc, and high-pressure gas is instantaneously generated inside the disposable lightning protection device 3 at the high temperature of the electric arc;
d) The upper cover and/or the lower cover of the disposable lightning protection device 3 are/is flushed away under the impact of the high-pressure gas, and the electric arc is extinguished under the injection of the high-pressure gas.
Through installing disposable lightning protection device 3 on line 1's insulator string 2, when being struck by lightning, can break down air gap 4 preferentially, make air gap 4 form the electric arc, the gas production conductor 6 of disposable lightning protection device 3 is melted by discharge current and is produced the electric arc, and produce high-pressure gas in the inside of disposable lightning protection device 3 in the twinkling of an eye under the electric arc high temperature, high-pressure gas is from the one end of disposable lightning protection device 3 to dash out and extinguish the electric arc, prevent the possibility that insulator string 2 is broken down by the thunderbolt promptly, avoided the trip that arouses because of the thunderbolt again, reached the purpose of safe lightning-arrest, and disposable lightning protection device 3 that uses cost is lower.
The disposable lightning protection device 3 used in this embodiment is disposable, so, preferably, all install on every insulator chain 2 of overhead line 1 disposable lightning protection device 3, but the greatly reduced probability of being struck by lightning, disposable lightning protection device 3 just becomes the vacancy after once using, because of the probability of same overhead line 1 being struck by lightning twice in one year is extremely low, consequently, can greatly reduced the cost of labor.
In a specific implementation process, the connecting end of the disposable lightning protection device 3 is installed on the upper end metal accessory of the insulator string 2, including the tower cross arm, through a connecting bracket 7.
In this embodiment, the length of the gas generating conductor 6 of the disposable lightning protection device 3 is equal to the length of the external insulation cylinder 5. It should be noted that the length of the external insulation cylinder 5 and the distance between the air gaps 4 of the disposable lightning protection device 3 are both larger than the internal overvoltage gap of the circuit 1, and smaller than the lightning protection voltage gap of the insulator string 2.
Preferably, the air gap 4 is equal to 70-90% of the lightning protection voltage gap of the insulator string 2. The distance of the air gap 4 is designed with a lightning protection voltage gap of 70-90% of the insulator string 2.
Preferably, the disposable lightning protection device 3 can always keep the distance between the air gaps 4 consistent through structural design. So that the distance of the air gap 4 does not greatly fluctuate and is always smaller than the lightning protection voltage gap of the insulator string 2. As shown in fig. 4 and 5, in the implementation, a spring 8 may be disposed between the connection end of the disposable lightning protection device 3 and the connection bracket 7, or an arc guide piece 9 with an upward opening may be disposed on the bottom surface of the discharge end of the disposable lightning protection device 3.
In this embodiment, the gas generating conductor 6 of the disposable lightning protection device 3 includes a gas generating material and a conductive material, so that a large amount of harmless gas can be generated after the gas generating material and the conductive material are melted, and a high-pressure gas is formed inside the disposable lightning protection device 3.
The connection tightness of the upper cover and/or the lower cover of the disposable lightning protection device 3 is smaller than the impact force of the high-pressure gas. The upper cover and/or the lower cover of the disposable lightning protection device 3 can be flushed open under the impact of high-pressure gas, so that the high-pressure gas is released to extinguish the electric arc.
Optionally, the upper cover and/or the lower cover of the disposable lightning protection device 3 and the external insulation cylinder 5 are integrally formed or separately combined and formed. The lightning protection device can be designed into an integral molding, and can be designed into a combined molding, and the connection tightness of the upper cover and/or the lower cover of the disposable lightning protection device 3 is only required to be smaller than the impact force of the high-pressure gas.
Example two
As shown in fig. 6, the difference between the present embodiment and the first embodiment is that in the present embodiment, the length of the gas generating conductor 6 of the disposable lightning protection device 3 is smaller than the length of the external insulation cylinder 5, and the length of the external insulation cylinder 5 and the distance of the air gap 4 of the disposable lightning protection device 3 are both larger than the internal overvoltage gap of the circuit 1, and at the same time, smaller than the lightning protection voltage gap of the insulator string 2.
The first and second embodiments are merely two of the plurality of embodiments, and the length of the gas generating conductor 6 of the disposable lightning protection device 3 is not limited thereto.
Example III
As shown in fig. 7, the difference between this embodiment and the first embodiment is that the installation position of the disposable lightning protection device 3, in this embodiment, the connection end of the disposable lightning protection device 3 is installed on the lower end metal accessory of the insulator string 2 through the connection bracket 7, and the discharge end of the disposable lightning protection device 3 is upward, and forms the air gap 4 with the nearest point of the conductors with different upward electric potentials. The length of the external insulating cylinder 5 and the distance between the air gaps 4 of the disposable lightning protection device 3 are larger than the internal overvoltage gap of the circuit 1, and are smaller than the lightning protection voltage gap of the insulator string 2.
The principle of the present embodiment is the same as that of the first embodiment, and thus a description thereof will not be repeated.
In this embodiment, the length of the gas generating conductor 6 of the disposable lightning protection device 3 is equal to the length of the external insulation cylinder 5. Of course, in another embodiment, the length of the gas generating conductor 6 of the disposable lightning protection device 3 may be changed to be smaller than the length of the external insulation cylinder 5, and reference may be made to the second embodiment.
Example IV
As shown in fig. 8, the difference between the present embodiment and the first and third embodiments is that the installation of the disposable lightning protection device 3 combines the installation methods of the first and third embodiments, in this embodiment, two disposable lightning protection devices 3 are provided, the connection ends of the two disposable lightning protection devices 3 are symmetrically installed on the upper and lower end metal accessories of the insulator string 2 through the connection bracket 7, and an air gap 4 is formed between the discharge ends of the upper and lower disposable lightning protection devices 3. The total length of the external insulation cylinder 5 and the distance between the air gaps 4 of the two disposable lightning protection devices 3 are larger than the internal voltage gap of the circuit 1, and are smaller than the lightning protection voltage gap of the insulator string 2.
The principle of this embodiment is the same as that of the above embodiment, and thus will not be repeated.
In this embodiment, the length of the gas generating conductors 6 of the two disposable lightning protection devices 3 is equal to the length of the external insulation cylinder 5. Of course, in other embodiments, the lengths of the gas generating conductors 6 of the two disposable lightning protection devices 3 may be changed to be smaller than the length of the external insulation cylinder 5, and the lengths of the gas generating conductors 6 of the two disposable lightning protection devices 3 are not necessarily equal.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The lightning protection method for the overhead line is characterized by comprising the following steps of:
a) Installing the disposable lightning protection device on one side of the insulator string;
b) An air gap is formed between the discharge end of the disposable lightning protection device and the nearest point of conductors with different electric potentials, the length of an external insulating cylinder body of the disposable lightning protection device and the distance of the air gap are larger than the internal overvoltage gap of the circuit, and meanwhile, the distance of the air gap is smaller than the lightning protection voltage gap of the insulator string;
c) When the lightning protection device is in a lightning stroke, the air gap forms an electric arc, the gas generating conductor of the disposable lightning protection device is melted by discharge current to generate the electric arc, and high-pressure gas is instantaneously generated in the disposable lightning protection device at the high temperature of the electric arc;
d) The upper cover and/or the lower cover of the disposable lightning protection device are/is flushed away under the impact of the high-pressure gas, and the electric arc is extinguished under the injection of the high-pressure gas.
2. The overhead line lightning protection method according to claim 1, wherein the disposable lightning protection device is installed on each insulator string of the overhead line.
3. The lightning protection method for overhead line according to claim 1, wherein in the step a), the connection end of the disposable lightning protection device is mounted on the upper/lower end metal fittings of the insulator string or symmetrically mounted on the upper/lower end metal fittings of the insulator string.
4. A method of lightning protection for overhead lines according to claim 1 or 3, wherein in step a) the connection end of the disposable lightning protection device is mounted by means of a connection bracket.
5. The overhead line lightning protection method according to claim 1, wherein in step b), the length of the gas generating conductor of the disposable lightning protection device is equal to or less than the length of the external insulation cylinder.
6. The overhead line lightning protection method according to claim 1, wherein in step b), the air gap is equal to 70-90% of the lightning protection voltage gap of the insulator string.
7. The overhead line lightning protection method according to claim 1, wherein in step b), the disposable lightning protection device is structured to maintain the distance of the air gap consistent throughout.
8. The overhead line lightning protection method of claim 1, wherein in step c) the gas generating conductor of the disposable lightning protection device comprises a gas generating material and a conductive material.
9. The overhead line lightning protection method according to claim 1, wherein in step d), the connection tightness of the upper cover and/or the lower cover of the disposable lightning protection device is smaller than the impact force of the high pressure gas.
10. The overhead line lightning protection method according to claim 9, wherein the upper cover and/or the lower cover of the disposable lightning protection device are integrally formed or separately combined with the external insulating cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810254444.6A CN110310790B (en) | 2018-03-27 | 2018-03-27 | Lightning protection method for overhead line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810254444.6A CN110310790B (en) | 2018-03-27 | 2018-03-27 | Lightning protection method for overhead line |
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| Publication Number | Publication Date |
|---|---|
| CN110310790A CN110310790A (en) | 2019-10-08 |
| CN110310790B true CN110310790B (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810254444.6A Active CN110310790B (en) | 2018-03-27 | 2018-03-27 | Lightning protection method for overhead line |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730834A (en) * | 2012-10-15 | 2014-04-16 | 闫仁宝 | Gas injection type parallel gap device |
| CN104240868A (en) * | 2014-10-11 | 2014-12-24 | 国家电网公司 | Line insulator and horn-shaped gap thereof |
| CN204315311U (en) * | 2014-10-11 | 2015-05-06 | 国家电网公司 | A kind of line insulator and angle-style gap thereof |
| WO2015120725A1 (en) * | 2014-02-17 | 2015-08-20 | 国网电力科学研究院武汉南瑞有限责任公司 | Lightning protection structure of overhead high voltage transmission line |
| CN107705941A (en) * | 2017-09-28 | 2018-02-16 | 上海兆邦电力器材有限公司 | For the arc-blowing device on electric power circuit insulator class electrical equipment |
| CN207938398U (en) * | 2018-03-27 | 2018-10-02 | 深圳带路科技有限公司 | A kind of disposable lightning protection device |
-
2018
- 2018-03-27 CN CN201810254444.6A patent/CN110310790B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730834A (en) * | 2012-10-15 | 2014-04-16 | 闫仁宝 | Gas injection type parallel gap device |
| WO2015120725A1 (en) * | 2014-02-17 | 2015-08-20 | 国网电力科学研究院武汉南瑞有限责任公司 | Lightning protection structure of overhead high voltage transmission line |
| CN104240868A (en) * | 2014-10-11 | 2014-12-24 | 国家电网公司 | Line insulator and horn-shaped gap thereof |
| CN204315311U (en) * | 2014-10-11 | 2015-05-06 | 国家电网公司 | A kind of line insulator and angle-style gap thereof |
| CN107705941A (en) * | 2017-09-28 | 2018-02-16 | 上海兆邦电力器材有限公司 | For the arc-blowing device on electric power circuit insulator class electrical equipment |
| CN207938398U (en) * | 2018-03-27 | 2018-10-02 | 深圳带路科技有限公司 | A kind of disposable lightning protection device |
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| CN110310790A (en) | 2019-10-08 |
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