CN110164638B - Power transmission line lightning arrester device for adjusting air gap according to environmental data - Google Patents
Power transmission line lightning arrester device for adjusting air gap according to environmental data Download PDFInfo
- Publication number
- CN110164638B CN110164638B CN201910405763.7A CN201910405763A CN110164638B CN 110164638 B CN110164638 B CN 110164638B CN 201910405763 A CN201910405763 A CN 201910405763A CN 110164638 B CN110164638 B CN 110164638B
- Authority
- CN
- China
- Prior art keywords
- lightning arrester
- air gap
- power transmission
- transmission line
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 53
- 230000007613 environmental effect Effects 0.000 title claims abstract description 9
- 239000012212 insulator Substances 0.000 claims abstract description 19
- 239000013618 particulate matter Substances 0.000 claims abstract description 13
- 238000012806 monitoring device Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 238000003860 storage Methods 0.000 abstract description 3
- 208000025274 Lightning injury Diseases 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/16—Resistor networks not otherwise provided for
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/123—Arrangements for improving potential distribution
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/08—Overvoltage arresters using spark gaps structurally associated with protected apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Insulators (AREA)
Abstract
The invention relates to a transmission line lightning arrester device for adjusting an air gap according to environmental data, which comprises a lightning arrester body connected in parallel with an insulator, wherein the high-voltage end of the lightning arrester body is connected with a transmission line through the air gap, and the low-voltage end of the lightning arrester body is connected with a transmission tower through a distance adjusting device; the power transmission tower is provided with a wireless transmitting and receiving device, an infrared ranging device, an air humidity sensor and an air particulate matter sensor, and measured data are transmitted to a background data monitoring center for storage through the wireless transmitting and receiving device. The invention can effectively reduce frequent starting of the lightning arrester and greatly prolong the service life of the lightning arrester; the adjustable air gap distance device has the function of adjusting the air gap distance, and can adjust the air gap distance according to different grades of power transmission lines and different atmospheric conditions; the air gap distances in different atmospheric environments can be recorded in the background.
Description
Technical Field
The invention belongs to the technical field of lightning arrester protection devices, and particularly relates to a power transmission line lightning arrester device capable of adjusting an air gap according to air environment data.
Background
The electric power system is the most serious field suffering from lightning disasters, and because the electric transmission line is mostly built in an overhead mode and is higher than surrounding buildings, the electric power system is extremely easy to suffer from lightning. Lightning damages the transmission line through two ways of direct lightning striking and inductive lightning, so that tripping of the transmission line affects normal power supply and even damages switching equipment to cause personnel and property loss. Among accidents of 275kV-500KV transmission lines in various countries such as the United states published by International great electric network conference, about six accidents are caused by lightning stroke, so that active researches are carried out on lightning stroke resistance of the transmission lines worldwide.
At present, the zinc oxide arrester is installed on a line and is a main technical means for enhancing the lightning stroke resistance of a transmission line, the line arrester and an insulator are installed in parallel, when a lightning stroke pole tower or a lead is struck, the arrester is conducted before the insulator string is flashover, so that a part of lightning is released through the arrester, the voltages at two ends of the insulator are clamped to a safe level, the insulator is reliably prevented from flashover, the line lightning trip-out rate is reduced, the line insulator is prevented from being subjected to comprehensive measures of shielding failure and counterattack flashover, the line arrester is classified according to a basic structure, the line arrester can be divided into a gapless line arrester and an outer-string gap line arrester, the outer-string gap line arrester is divided into an outer-string pure air gap line arrester and an outer-string insulating support gap line arrester, and the performance characteristics of the three are different.
The gapless line arrester can frequently act under the action of operation overvoltage, and stability is not high. Finally, because of no gap isolation, the maintenance-free function cannot be realized, and once an accident occurs to the lightning arrester, the normal power supply of the power transmission line can be directly endangered. The outer string of pure air gap type lightning arresters can avoid frequent starting of the lightning arresters, but the selection of the air gap distance should ensure the normal operation of the lightning arresters, but the selection of the air gap distance is related to the humidity, the component ratio and the like of the air. In addition, the lightning arrester should be started before the insulator, and the insulation characteristic of the insulator is affected by the pollution, if the air gap is not regulated, the insulator may be broken down, and the lightning arrester is not started yet, so that the protection effect cannot be achieved, that is, the distance of the air gap is a variable value, and no related novel product capable of intelligently regulating the air gap exists at present.
In view of the important role of the transmission line arrester in line lightning protection, the method is optimized on the basis of analyzing and summarizing the advantages and disadvantages of the existing line arrester, and the novel transmission line arrester which is convenient to install and maintain, excellent in electrical performance, safe and reliable to operate is developed, and an economic and effective installation scheme is formulated, so that the method has great practical significance.
Disclosure of Invention
Aiming at the technical problems, the invention provides a lightning arrester device for a power transmission line, which can adjust an air gap according to atmospheric environment data. According to the lightning arrester device for the power transmission line, the air gap is increased, and the critical value of the starting voltage of the lightning arrester is increased relative to that of the lightning arrester without the air gap, so that frequent starting is avoided, the service life of the lightning arrester can be prolonged, and the air gap of the lightning arrester device can be adjusted in time according to different conditions of the atmosphere environment in which the lightning arrester is located. The technical scheme adopted by the invention is as follows:
the utility model provides a transmission line arrester device of air gap is adjusted according to environmental data, includes the arrester body that connects in parallel with the insulator, and the high voltage end of arrester body is connected transmission line through the air gap, and the low voltage end of arrester body is connected to transmission tower through the distance adjustment device; the transmission tower is provided with a wireless transmitting and receiving device and a lightning arrester environment data monitoring device which are electrically connected with each other. The lightning arrester environmental data monitoring device comprises: the infrared distance measuring device, the air humidity sensor and the air particulate matter sensor, and the wireless transmitting and receiving device transmits measured data to the background data monitoring center for storage.
The lightning arrester body is a core device of the device and is used for absorbing the energy of transient overvoltage. The distance adjusting device is used for adjusting the air gap distance between the high-voltage end of the lightning arrester body and the power transmission line so as to adapt to different working conditions. The infrared distance measuring device is used for measuring the air gap distance between the high-voltage end of the lightning arrester body and the power transmission line. The air humidity sensor and the air particulate matter sensor are respectively used for monitoring the real-time air humidity and the particulate matter content, particularly recording the atmospheric condition when the air gap is conducted, and the air gap distances under different environment states have reference significance for the later-period adjustment of the air gap distances. Wireless transmitting and receiving devices are used to transmit and receive various wireless signals. The background data monitoring center is used for recording air gap distance data of different working conditions as a follow-up improvement basis.
One end of the distance adjusting device is fixedly arranged on the transmission tower, and the other end of the distance adjusting device is connected with the lightning arrester body and used for adjusting the air gap distance between the transmission line and the lower part of the lightning arrester body.
Because under the lightning impulse, the novel line arrester body should act before the parallel insulator string except for acceptable protection failure rate, the protected insulator string is ensured not to generate lightning flashover. Therefore, the volt-second characteristic of the novel line arrester body must be lower than that of the parallel insulator string, and a larger fit margin is reserved, and the gap distance should be selected to be smaller as much as possible.
Under the action of operation overvoltage, the novel line arrester body should not act, so that the normal operation of the power transmission line is ensured. Therefore, the volt-second characteristic of the novel line arrester must be higher than the maximum operation overvoltage of the power transmission line, and a larger matching margin is reserved, and the gap distance should be selected to be larger as much as possible.
It can be seen that the two conditions have a certain contradiction, so that the selection of the gap distance needs to be comprehensively considered, the limit value of the air gap can be obtained by adopting the electrical simulation software ATP-EMTP to perform simulation calculation, the starting of the lightning arrester body before the insulator is flashover is ensured, the operation overvoltage on the transmission line can be borne without false starting, and the normal starting of the lightning arrester is not influenced.
According to the invention, through the environmental data monitoring devices of the lightning arrester such as the infrared distance measuring device, the air humidity sensor, the air particulate matter sensor and the like, whether the lightning arrester device can work normally or not can be monitored at any time when the gap distance is affected by the environment. Once the lightning arrester affected by the environment is found to be problematic, the distance of the air gap is adjusted appropriately in time, so that the safety of the power transmission line is ensured.
The invention has the beneficial effects that:
1. the invention adopts the zinc oxide arrester to connect with the air gap in series, which can effectively reduce the frequent starting of the arrester and greatly prolong the service life of the arrester.
2. The invention adopts the distance adjusting device, has the function of adjusting the air gap distance, and can adjust the air gap distance according to different grades of power transmission lines and different atmospheric conditions.
3. The invention has the advantages of automation, intellectualization and the like, and can record the air gap distances under different atmospheric environments in the background for subsequent improvement.
4. The invention has the advantages of wide applicability, standardized production, modularized assembly and the like, and the power transmission lines of different grades can bear different operation overvoltage values and can adjust the air gap according to different operation overvoltages.
Drawings
Fig. 1 is a schematic view of the working principle of an arrester according to an embodiment of the present invention;
figure 2 is a schematic view of an arrester installation according to an embodiment of the present invention;
fig. 3 is a schematic view of an arrester in-situ construction in accordance with an embodiment of the present invention;
in the figure, a 1-insulator, a 2-lightning arrester body, a 3-distance adjusting device, a 4-air gap, a 5-power transmission line and a 6-power transmission tower.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
As shown in fig. 1, the working principle of the lightning arrester according to the embodiment of the invention is schematically shown; as shown in fig. 2, a schematic view of the installation of the lightning arrester according to an embodiment of the invention is shown. The utility model provides a transmission line arrester device of air gap is adjusted according to environmental data, includes arrester body 2 parallelly connected with insulator 1, and the high voltage end of arrester body 2 is connected transmission line 5 through air gap 4, and the low voltage end of arrester body 2 is connected to transmission tower 6 through distance adjusting device 3; the power transmission tower 6 is provided with a wireless transmitting and receiving device, an infrared ranging device, an air humidity sensor and an air particulate matter sensor, wherein the infrared ranging device, the air humidity sensor and the air particulate matter sensor are electrically connected with the wireless transmitting and receiving device, and measured data are transmitted to a background data monitoring center for storage through the wireless transmitting and receiving device.
Further, the distance adjusting device 3 is a telescopic pull rod, and a coil and a spring are arranged on the telescopic pull rod; as shown in fig. 3, a schematic view of the field construction of the lightning arrester according to the embodiment of the invention is shown. When thunder or lightning or overvoltage is encountered, the air gap is conducted, and the coil is acted by magnetic field force to pull the air gap small; after the overcurrent is released, the coil is no longer acted by the magnetic field force, and the air gap is pulled up again under the action of the spring.
The size of the air gap is also different under different atmospheric conditions. After the lightning arrester device of the power transmission line is put into use, the infrared distance measuring device, the air humidity sensor and the air particulate matter sensor record the atmospheric data when the air gap is conducted, and the air gap can be analyzed by artificial intelligence and adjusted in time based on the data.
In the embodiment of the invention, the infrared distance measuring device, the air humidity sensor, the air particulate matter sensor and the wireless transmitting and receiving device can be all of common product types in the market, and can be firmly arranged at a proper position on a power transmission tower in a conventional fixed connection mode such as welding, bolts and the like.
Claims (2)
1. The utility model provides a transmission line arrester device according to environmental data regulation air gap which characterized in that: the lightning arrester comprises a lightning arrester body (2) connected with an insulator (1) in parallel, wherein the high-voltage end of the lightning arrester body (2) is connected with a power transmission line (5) through an air gap (4), and the low-voltage end of the lightning arrester body (2) is connected with a power transmission iron tower (6) through a distance adjusting device (3);
the utility model discloses a lightning arrester environment data monitoring device, including transmission tower (6), be provided with wireless transmission and receiving arrangement, the lightning arrester environment data monitoring device of mutual electric connection on transmission tower (6), lightning arrester environment data monitoring device includes: an infrared distance measuring device, an air humidity sensor and an air particulate matter sensor;
the distance adjusting device (3) is a telescopic pull rod, and a coil and a spring are arranged on the telescopic pull rod;
the lightning arrester body (2) is used for absorbing the energy of transient overvoltage, the distance adjusting device (3) is used for adjusting the air gap distance between the high-voltage end of the lightning arrester body (2) and the power transmission line, the infrared distance measuring device is used for measuring the air gap distance between the high-voltage end of the lightning arrester body (2) and the power transmission line, the air humidity sensor and the air particulate matter sensor are respectively used for monitoring real-time air humidity and particulate matter content and recording the atmospheric condition when the air gap is conducted, the volt-second characteristic of the lightning arrester body (2) is lower than the volt-second characteristic of a parallel insulator string, the volt-second characteristic of the lightning arrester body (2) is higher than the maximum operation overvoltage of the power transmission line, the limit value of the air gap (4) is obtained by adopting electrical simulation software ATP-EMTP to perform simulation calculation, the lightning arrester body (2) is ensured to be started before the insulator (1) is flashover, and the operation overvoltage on the power transmission line can be born without being wrongly started.
2. The lightning arrester device for electric power transmission lines for adjusting air gap according to environmental data of claim 1, wherein the infrared distance measuring device, the air humidity sensor, the air particulate matter sensor and the wireless transmitting and receiving device are firmly installed at a proper position on the electric power transmission tower (6) in a fixed connection manner of welding or bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910405763.7A CN110164638B (en) | 2019-05-16 | 2019-05-16 | Power transmission line lightning arrester device for adjusting air gap according to environmental data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910405763.7A CN110164638B (en) | 2019-05-16 | 2019-05-16 | Power transmission line lightning arrester device for adjusting air gap according to environmental data |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110164638A CN110164638A (en) | 2019-08-23 |
| CN110164638B true CN110164638B (en) | 2024-02-23 |
Family
ID=67634741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910405763.7A Active CN110164638B (en) | 2019-05-16 | 2019-05-16 | Power transmission line lightning arrester device for adjusting air gap according to environmental data |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110164638B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358000A (en) * | 2021-06-17 | 2021-09-07 | 广东电网有限责任公司 | Air gap measuring method of gap arrester |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728808A (en) * | 2010-01-23 | 2010-06-09 | 山东迅实电气有限公司 | Arrester for electrified railway traction power supply system |
| CN101799492A (en) * | 2010-03-23 | 2010-08-11 | 胡淼龙 | Arrester wireless on-line monitoring device |
| CN202710690U (en) * | 2012-03-06 | 2013-01-30 | 嘉兴电力局 | Lightning arrester leakage current online monitoring system based on wireless sensor network |
| CN102930943A (en) * | 2012-10-09 | 2013-02-13 | 中国电力科学研究院 | Pure-air serial gap type extra-high voltage line lightening arrester |
| CN203747241U (en) * | 2013-12-13 | 2014-07-30 | 中国西电电气股份有限公司 | Air gap lightning arrester |
| CN104599798A (en) * | 2014-12-12 | 2015-05-06 | 国家电网公司 | Direct current lightning arrester and system using the same |
| CN106054006A (en) * | 2016-08-08 | 2016-10-26 | 国网湖南省电力公司 | Low-voltage arc starting and gap distance adjustable power-frequency freewheeling test apparatus and method |
| CN207638332U (en) * | 2017-12-28 | 2018-07-20 | 浙江多格电气有限公司 | One kind having the adjustable arrester of discharging gap |
| CN210073517U (en) * | 2019-05-16 | 2020-02-14 | 山东电力设备有限公司 | Transmission line arrester device for adjusting air gap according to environmental data |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856021B (en) * | 2012-09-27 | 2014-11-05 | 王巨丰 | Follow current-free arc lightening-protection gap protection device |
-
2019
- 2019-05-16 CN CN201910405763.7A patent/CN110164638B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728808A (en) * | 2010-01-23 | 2010-06-09 | 山东迅实电气有限公司 | Arrester for electrified railway traction power supply system |
| CN101799492A (en) * | 2010-03-23 | 2010-08-11 | 胡淼龙 | Arrester wireless on-line monitoring device |
| CN202710690U (en) * | 2012-03-06 | 2013-01-30 | 嘉兴电力局 | Lightning arrester leakage current online monitoring system based on wireless sensor network |
| CN102930943A (en) * | 2012-10-09 | 2013-02-13 | 中国电力科学研究院 | Pure-air serial gap type extra-high voltage line lightening arrester |
| CN203747241U (en) * | 2013-12-13 | 2014-07-30 | 中国西电电气股份有限公司 | Air gap lightning arrester |
| CN104599798A (en) * | 2014-12-12 | 2015-05-06 | 国家电网公司 | Direct current lightning arrester and system using the same |
| CN106054006A (en) * | 2016-08-08 | 2016-10-26 | 国网湖南省电力公司 | Low-voltage arc starting and gap distance adjustable power-frequency freewheeling test apparatus and method |
| CN207638332U (en) * | 2017-12-28 | 2018-07-20 | 浙江多格电气有限公司 | One kind having the adjustable arrester of discharging gap |
| CN210073517U (en) * | 2019-05-16 | 2020-02-14 | 山东电力设备有限公司 | Transmission line arrester device for adjusting air gap according to environmental data |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110164638A (en) | 2019-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110164638B (en) | Power transmission line lightning arrester device for adjusting air gap according to environmental data | |
| CN210073517U (en) | Transmission line arrester device for adjusting air gap according to environmental data | |
| CN202473431U (en) | External string pure air gap lightning arrester | |
| CN202384124U (en) | Arrester for direct-current power transmission line protection | |
| CN112614640A (en) | 500kV transmission line is with preventing wind partially jumper wire arrester | |
| CN210349489U (en) | Multiple series gap lightning stroke flashover protector | |
| CN110768226A (en) | MOV overvoltage protection device based on zinc oxide nonlinear resistor | |
| CN112332220A (en) | Built-in series gap lightning arrester of distribution line | |
| CN112054459A (en) | Lightning protection method for distribution line | |
| CN209199692U (en) | A kind of tension-resistant rod external series gap metal oxide arrester | |
| CN202940460U (en) | Tower lightning arrester | |
| CN201690231U (en) | Nonlinear neutral point ground resistor | |
| CN213815697U (en) | 500kV transmission line is with preventing wind partially jumper wire arrester | |
| CN211905509U (en) | Intelligent statistical lightning stroke counting uploading device | |
| CN203504165U (en) | Lightning prevention grounding system | |
| Gao et al. | Protection of series compensation station against lightning intruded wave in 1000kV AC transmission system | |
| CN215896080U (en) | Lightning protection device for power distribution network line | |
| Ndirangu et al. | Appropriate Surge Arrester Lead Lengths for Improved Distribution Transformer Protection—Kenyan Case Study | |
| CN211530393U (en) | Blocking reactor for lightning intrusion waves of booster station of power plant | |
| CN213093387U (en) | Lightning arrester ground wire opening and closing control device | |
| CN204696621U (en) | A kind of lightning protection device for brownout operation multiple-circuit on same tower | |
| CN216772954U (en) | Dual-purpose lightning arrester | |
| CN219575493U (en) | Novel 10kV pole-mounted circuit breaker | |
| CN2456352Y (en) | Computer lightning protection installation | |
| CN215267585U (en) | Protection device for preventing earth fault counterattack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |