CN111653880B - Double-rod type self-maintenance lightning arrester grounding system - Google Patents
Double-rod type self-maintenance lightning arrester grounding system Download PDFInfo
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- CN111653880B CN111653880B CN202010605757.9A CN202010605757A CN111653880B CN 111653880 B CN111653880 B CN 111653880B CN 202010605757 A CN202010605757 A CN 202010605757A CN 111653880 B CN111653880 B CN 111653880B
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- rod body
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- 238000012423 maintenance Methods 0.000 title claims abstract description 18
- 238000007790 scraping Methods 0.000 claims abstract description 37
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 35
- 239000011810 insulating material Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 238000010301 surface-oxidation reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- B08B1/30—
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- 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
- H01T19/00—Devices providing for corona discharge
- H01T19/04—Devices providing for corona discharge having pointed electrodes
Abstract
The invention discloses a double-rod type self-maintenance lightning arrester grounding system, which comprises an upper rod body inserted on the ground surface, wherein the lower end of the upper rod body is flexibly connected with a first lower rod body and a second lower rod body, the first lower rod body and the second lower rod body are both stably and electrically connected with the upper rod body through wires, the first lower rod body and the second lower rod body are arranged in parallel, and one sides of the first lower rod body and the second lower rod body, which are close to each other, are jointly fixed with a self-triggering device; the outer walls of the first lower rod body and the second lower rod body are respectively sleeved with a metal scraping blade, and the scraping blades are of spiral structures and are in a sheet shape at one side close to the corresponding lower rod body. Has the advantages that: the two lower rod bodies made of different materials are arranged in the grounding device, the surface oxidation speeds of the two lower rod bodies are obviously different, and the two lower rod bodies can generate an obvious potential difference in a short time in thunderstorm weather, so that the trigger assembly works to remove oxide impurities on the lower rod bodies, and the self-maintenance effect on the grounding device is achieved.
Description
Technical Field
The invention relates to the technical field of electric power facilities, in particular to a double-rod type self-maintenance lightning arrester grounding system.
Background
For the existing arrester grounding system, a fixed metal rod is generally adopted, generally composed of a copper rod, an iron rod or an alloy rod, and is directly inserted into the ground, and the upper end of the fixed metal rod is connected with the arrester. In actual operation, the underground environment may contain obvious acidic or alkaline impurities, so that the soil becomes complicated and severe, and the surface of the ground rod buried underground is easily oxidized, the ground resistance is obviously increased, the electric charge on the ground rod cannot be timely and rapidly conducted to the ground, and if the problem is not timely solved, the lightning arrester cannot achieve a good lightning protection effect. After the grounding device in the prior art is oxidized, the grounding device must be pulled out for repair treatment, or a new grounding device is directly adopted for replacement, so that the maintenance cost is high.
We have therefore proposed an earth-engaging device which is self-maintaining when significant oxidation of the earth-engaging surface occurs.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a double-rod type self-maintenance lightning arrester grounding system.
In order to achieve the purpose, the invention adopts the following technical scheme: a double-rod type self-maintenance lightning arrester grounding system is characterized in that an upper rod body is inserted into the ground surface, the lower end of the upper rod body is flexibly connected with a first lower rod body and a second lower rod body, the first lower rod body and the second lower rod body are both stably and electrically connected with the upper rod body through wires, the first lower rod body and the second lower rod body are arranged in parallel, and a self-triggering device is fixed on one side, close to each other, of the first lower rod body and the second lower rod body;
the outer walls of the first lower rod body and the second lower rod body are sleeved with metal scraping blades, the scraping blades are of spiral structures, one side, close to the corresponding lower rod body, of each scraping blade is in a sheet shape, and the upper ends or the lower ends of the scraping blades are fixedly connected with the corresponding lower rod body;
the self-triggering device comprises two capacitor plates which are respectively and electrically connected with the first lower rod body and the second lower rod body; and a trigger component is arranged between the two capacitor plates.
In the double-rod type self-maintenance lightning arrester grounding system, the contact positions of the upper rod body and the two lower rod bodies are both provided with flexible glue plates, and diodes are electrically connected between the two capacitor plates and the corresponding lower rod bodies.
In foretell double-stick formula is from maintaining arrester ground system, trigger the subassembly and include that hollow and for the metal material's the piece that hits, it has an insulating material's slider to hit sliding connection in the piece, the inside fixed first electrified inner core that has a negative electricity that has buried underground of slider, the equal fixedly connected with in both ends of slider connects the electric piece, two connect the electric piece respectively to two doctor-bars electric connection, two the one end electricity that connects the electric piece was kept away from to the doctor-bar is connected with first grounding lug.
In the double-rod type self-maintenance lightning arrester grounding system, the trigger assembly comprises a sliding rail with a downward-concave middle part and made of an insulating material, a magnetic block is connected in the sliding rail in a sliding manner, a layer of metal film is attached to the outer wall of the magnetic block, and a second electrified inner core is embedded in the magnetic block in an insulating manner;
the lower end of the middle of the sliding rail is provided with a conductive block in a penetrating and embedding mode, and the conductive block is electrically connected with a second grounding piece.
Compared with the prior art, the invention has the advantages that:
1. the two lower rods made of different materials are arranged in the grounding device, the surface oxidation speeds of the two lower rods are obviously different inevitably when the two lower rods are buried underground, namely, the conditions that one lower rod is high in oxidation degree and high in surface resistance and the other lower rod is low in surface oxidation degree and low in surface resistance exist, so that the two lower rods can generate obvious potential difference in a short time in thunderstorm weather, the trigger assembly works, oxide impurities on the lower rods are removed, and the self-maintenance effect on the grounding device is achieved.
2. In the first embodiment of the invention, when the charge amount of the cloud is large, the two capacitor plates are electrified synchronously, the capacitor plate corresponding to the lower rod body with high oxidation degree and large resistance has large electric quantity, and generates larger electrostatic attraction to the first electrified inner core, so that the sliding block part is attracted to approach to the lower rod body until the sliding block part impacts the lower rod body, the corresponding lower rod body is driven to vibrate in the process, and at the moment, the scraping blade on the corresponding lower rod body and the lower rod body generate a certain amount of relative motion, so that the scraping blade can scrape part of the oxide on the surface of the lower rod body.
3. In the first embodiment, in the process of impact between the impact block and the capacitor plate, the sliding block is in contact with the electric contact piece on the corresponding side under the action of inertia force, and at the moment, the impact block, the electric contact piece on the corresponding side, the scraping blade on the corresponding side and the first electric contact piece form a passage, so that charges on the impact block are released to the ground and the scraping blade is electrified for a short time.
4. In the second embodiment of the invention, when an obvious electric charge on one capacitor plate attracts the magnetic block to rapidly move and to collide with the corresponding capacitor plate, the metal film on the surface of the magnetic block after the electric charge is redistributed is electrified and repels the capacitor plate to reversely slide, when the magnetic block moves to be in contact with the conductive block, the magnetic field generated by the magnetic block is always in a changing state, and the current in the scraper can cause each circle of metal to generate a magnetic field which is reversed and in the same direction, so that the scraper can generate a shaking and vibrating effect, the oxide on the outer wall of the corresponding lower rod body can be scraped, a good grounding effect can be ensured, and the self-maintenance work of the grounding rod of the whole lightning arrester can be completed.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of a dual-rod self-maintenance lightning arrester grounding system according to the present invention;
FIG. 2 is an enlarged schematic view of a portion of the trigger assembly of FIG. 1;
fig. 3 is a schematic structural diagram of another embodiment of a dual-rod self-maintenance lightning arrester grounding system according to the present invention;
fig. 4 is an enlarged schematic view of a portion of the trigger assembly of fig. 3.
In the figure: the electric heating rod comprises an upper rod body 1, a first lower rod body 2, a second lower rod body 3, a flexible glue plate 4, a scraping blade 5, a capacitance plate 6, a collision block 7, a sliding block 8, a first electrified inner core 9, a power connection piece 10, a first grounding piece 11, a sliding rail 12, a magnetic block 13, a second electrified inner core 14, a conductive block 15 and a second grounding piece 16.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example one
Referring to fig. 1-2, a double-rod type self-maintenance lightning arrester grounding system comprises an upper rod body 1 inserted on the ground surface, wherein the lower end of the upper rod body 1 is flexibly connected with a first lower rod body 2 and a second lower rod body 3, the first lower rod body 2 and the second lower rod body 3 are both stably and electrically connected with the upper rod body 1 through wires, the first lower rod body 2 and the second lower rod body 3 are arranged in parallel, and a self-triggering device is fixed on one side of the first lower rod body 2 and one side of the second lower rod body 3 close to each other;
the outer walls of the first lower rod body 2 and the second lower rod body 3 are sleeved with metal scraping blades 5, the scraping blades 5 are in a spiral structure, one side, close to the corresponding lower rod body, of each scraping blade 5 is in a sheet shape, the sheet shape ensures that the scraping blades have a good scraping effect on oxides on the surface of the lower rod body, the upper ends or the lower ends of the scraping blades 5 are fixedly connected with the corresponding lower rod body, a certain limiting effect is generated on the scraping blades 5, and it is worth explaining that the scraping blades 5 are fixedly connected with the lower rod body in an insulating mode;
the self-triggering device comprises two capacitor plates 6, the two capacitor plates 6 are respectively and electrically connected with the first lower rod body 2 and the second lower rod body 3, the capacitor plates 6 are fixedly connected with the two lower rod bodies, and vibration generated when the collision block 7 collides with the capacitor plates 6 can be transmitted to the corresponding lower rod bodies; a trigger component is arranged between the two capacitor plates 6.
Go up the contact department of barred body 1 and two barred bodies down and all be provided with flexible glue board 4, flexible glue board 4 can make vibrations on the barred body transfer to supreme barred body 1 down, two electric capacity boards 6 with correspond down between the barred body electrically connected with the diode, can distribute to the electric capacity board when the barred body upper segment time accumulation has more electric charge down on, and the one-way effect of diode avoids electric charge redistribution to go down on the barred body. The trigger assembly comprises a hollow collision block 7 made of metal, a sliding block 8 made of insulating material is slidably connected in the collision block 7, a first electrified inner core with negative electricity is fixedly embedded in the sliding block 8, two ends of the sliding block 8 are fixedly connected with an electric connection piece 10, the two electric connection pieces 10 are respectively electrically connected with two scraping pieces 5, and one end of each scraping piece 5, far away from the electric connection piece 10, is electrically connected with a first grounding piece 11.
In the embodiment, the upper end of the upper rod body 1 is electrically connected with the lightning rod, the lightning rod is positioned at a higher position until the lightning rod extends into a cloud layer, and at the moment, the sharp end of the lightning rod can release charges in the charges and the charges in the cloud layer around the charges, so that the lightning protection effect is realized;
in this embodiment, the two lower rods are made of different materials, such as iron, copper, and other metals; when the surface resistance of the two lower rod bodies is smaller, the electric potential of each point on the lower rod bodies is zero, and the electric potential of the capacitance plate 6 electrically connected with the two lower rod bodies is also zero; because the two lower rods are made of different materials, the surface oxidation speeds of the two lower rods are obviously different when the two lower rods are buried underground, namely, the conditions that one lower rod has higher oxidation degree and higher surface resistance and the other lower rod has lower surface oxidation degree and lower surface resistance exist;
when the charge amount of the cloud is larger (with a thunder trend), the lightning rod of the cloud releases partial charges, at the moment, the lower rod body positioned on the ground surface can quickly accumulate a certain amount of opposite charges, because the surface resistances of the two lower rod bodies are obviously different, the two lower rod bodies can instantly generate an obvious potential difference, the two capacitor plates 6 electrically connected with the two lower rod bodies can be synchronously electrified, the capacitor plates 6 corresponding to the lower rod bodies with high oxidation degree and large resistance have larger electrification amount, and the other capacitor plate 6 has smaller electrification amount; and the first charged inner core 9 has charges with opposite polarity to the capacitor plates 6, and one of the two capacitor plates 6 with larger charge generates larger electrostatic attraction to the first charged inner core, so that the slider 8 is attracted to approach the first charged inner core until the first charged inner core collides, the collision block 7 is contacted with the capacitor plates 6 during collision, the charges of the collision block and the capacitor plates are redistributed, so that the collision block 7 has charges with the same polarity as the capacitor plates 6, and at the moment, the collision block 7 and the capacitor plates 6 generate electrostatic repulsion to push the two away from each other.
The collision block 7 and the capacitor plate 6 inevitably drive the corresponding lower rod body to vibrate in the collision process, and at the moment, the scraping blade 5 on the corresponding lower rod body and the lower rod body generate a certain amount of relative movement, so that the scraping blade 5 can scrape a part of the oxide on the surface of the lower rod body;
during the collision between the striking block 7 and the capacitor plate 6, the slide block 8 in the striking block 7 moves towards the corresponding capacitor plate 6 under the action of inertia force, so that the electric connecting piece 10 on the corresponding side is contacted with the striking block 7, and at the moment, the striking block 7, the electric connecting piece 10 on the corresponding side, the scraping blade 5 on the corresponding side and the first electric connecting piece 11 form a passage, so that charges on the striking block 7 are released to the ground and the scraping blade 5 is electrified for a short time, because the scraping blade 5 is made of metal, magnetic fields are generated on each circle of metal when the scraping blade 5 is electrified, and the magnetic fields generate acting force to enable the scraping blade 5 to move on the lower rod body 2 along the axial direction of the lower rod body, so that the scraping blade 5 moves relative to the surface of the lower rod body again, and part of oxides on the surface of the lower rod body is scraped again;
after the scraper 5 is electrified, the collision block 7 and the first charged inner core 9 are integrally restored to the charge of the first charged inner core 9, and the capacitance plate 6 generates electrostatic attraction with the first charged inner core again, so that the actions are repeated until the oxide on the surface of the lower rod body is obviously scraped and the resistance on the corresponding lower rod body is obviously reduced, and the self-maintenance process of the lower rod body is completed.
In this embodiment, an inductance coil can be electrically connected between the power connection piece 10 and the wiper blade 5 to delay the process of discharging the charges on the bump 7 to the wiper blade 5, so as to avoid discharging the charges from the wiper blade 5 when the bump 7 contacts the capacitor plate 6.
Example two
Referring to fig. 3 to 4, the difference between the first embodiment and the second embodiment is that the trigger assembly in the present embodiment is different, the trigger assembly in the present embodiment includes a sliding rail 12 with a downward concave middle part and made of an insulating material, a magnetic block 13 is slidably connected in the sliding rail 12, a layer of metal film is attached to an outer wall of the magnetic block 13, and a second electrified inner core 14 is embedded in the magnetic block 13 in an insulating manner; a conductive block 15 is embedded in the lower end of the middle part of the slide rail 12 in a penetrating manner, and the conductive block 15 is electrically connected with a second grounding piece 16.
In the trigger assembly in this embodiment, when there is an obvious charge on the capacitor plate 6 corresponding to one of the lower bars, the charge attracts the second charged inner core 14 to make the magnetic block portion move rapidly, and collide with the corresponding capacitor plate 6 and redistribute the charge, the metal film on the surface of the magnetic block 13 after redistribution of the charge repels the capacitor plate 6 and slides in the opposite direction, when the magnetic block 13 moves to contact with the conductive block 15, the charge on the metal film of the magnetic block 13 is conducted to the ground through the conductive block 15 and is not charged, so that the magnetic block 13 returns to the initial position to receive the capacitor plate 6 again for attraction, and the above process is repeated until the capacitor plate 6 does not have an obvious charge.
When the magnetic block 13 moves, the magnetic field generated by the magnetic block is always in a changing state, the changing of the magnetic field is periodically changed in a reciprocating motion process, the scraper 5 moves relative to the magnetic field to generate a potential difference at two ends of the scraper and further generate current, and the current is periodically changed by the reciprocating motion of the magnetic block 13, namely alternating current. Alternating current in the scraping piece 5 can make each circle of metal produce reverse magnetic field in the same direction when being reverse to make the scraping piece 5 produce the effect of tremble shake, thereby can scrape the oxide that corresponds down the barred body outer wall, guarantee good ground effect, accomplish the self-maintenance work of whole arrester earth bar.
Although the terms of the upper rod 1, the first lower rod 2, the second lower rod 3, the soft rubber plate 4, the wiper blade 5, the capacitor plate 6, the striking block 7, the sliding block 8, the first charged core 9, the electric connecting piece 10, the first grounding piece 11, the sliding rail 12, the magnetic block 13, the second charged core 14, the electric conducting piece 15, the second grounding piece 16, etc. are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (1)
1. The double-rod type self-maintenance lightning arrester grounding system comprises an upper rod body (1) inserted on the ground surface, and is characterized in that the lower end of the upper rod body (1) is flexibly connected with a first lower rod body (2) and a second lower rod body (3), the first lower rod body (2) and the second lower rod body (3) are both stably and electrically connected with the upper rod body (1) through wires, the first lower rod body (2) and the second lower rod body (3) are arranged in parallel, and a self-triggering device is jointly fixed on one side, close to each other, of the first lower rod body (2) and the second lower rod body (3);
the outer walls of the first lower rod body (2) and the second lower rod body (3) are sleeved with metal scraping blades (5), the scraping blades (5) are of a spiral structure, one side, close to the corresponding lower rod body, of each scraping blade is in a sheet shape, and the upper ends or the lower ends of the scraping blades (5) are fixedly connected with the corresponding lower rod body;
the self-triggering device comprises two capacitance plates (6), and the two capacitance plates (6) are respectively and electrically connected with the first lower rod body (2) and the second lower rod body (3); a trigger component is arranged between the two capacitor plates (6);
the contact parts of the upper rod body (1) and the two lower rod bodies are both provided with a flexible glue plate (4), and a diode is electrically connected between the two capacitor plates (6) and the corresponding lower rod bodies;
the trigger assembly comprises a hollow collision block (7) made of metal, a sliding block (8) made of insulating materials is connected in the collision block (7) in a sliding mode, a first electrified inner core with negative electricity is fixedly buried in the sliding block (8), two ends of the sliding block (8) are fixedly connected with an electric connecting piece (10), the two electric connecting pieces (10) are respectively and electrically connected with two scraping pieces (5), and one ends, far away from the electric connecting piece (10), of the two scraping pieces (5) are electrically connected with a first grounding piece (11);
the trigger assembly comprises a sliding rail (12) with a downward-concave middle part and made of an insulating material, a magnetic block (13) is connected in the sliding rail (12) in a sliding mode, a layer of metal film is attached to the outer wall of the magnetic block (13), and a second electrified inner core (14) is embedded in the magnetic block (13) in an insulating mode;
the lower end of the middle of the sliding rail (12) is provided with a conductive block (15) in a penetrating and embedding mode, and the conductive block (15) is electrically connected with a second grounding piece (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010605757.9A CN111653880B (en) | 2020-06-29 | 2020-06-29 | Double-rod type self-maintenance lightning arrester grounding system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010605757.9A CN111653880B (en) | 2020-06-29 | 2020-06-29 | Double-rod type self-maintenance lightning arrester grounding system |
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| CN111653880A CN111653880A (en) | 2020-09-11 |
| CN111653880B true CN111653880B (en) | 2021-07-27 |
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| CN112134036A (en) * | 2020-09-24 | 2020-12-25 | 湖州越彬智能科技有限公司 | Modular from maintaining arrester ground system |
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| JP2003217702A (en) * | 2002-01-22 | 2003-07-31 | Sankosha Corp | Ground body and its execution method |
| CN201946767U (en) * | 2010-12-27 | 2011-08-24 | 成都桑莱特科技股份有限公司 | Current drainage grounding device |
| CN102394389A (en) * | 2011-06-17 | 2012-03-28 | 国网电力科学研究院武汉南瑞有限责任公司 | High ferrochrome silicon electrode for direct-current grounding electrode |
| CN105552591A (en) * | 2015-08-07 | 2016-05-04 | 仲杏英 | Lightning arrester earthing device with characteristic of easy maintenance |
| CN109980373A (en) * | 2019-04-18 | 2019-07-05 | 李兵 | A kind of maintenance earthing of lightening arrester certainly |
| CN110061366A (en) * | 2019-04-30 | 2019-07-26 | 李兵 | A kind of earthing of lightening arrester easy to maintain |
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2020
- 2020-06-29 CN CN202010605757.9A patent/CN111653880B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003217702A (en) * | 2002-01-22 | 2003-07-31 | Sankosha Corp | Ground body and its execution method |
| CN201946767U (en) * | 2010-12-27 | 2011-08-24 | 成都桑莱特科技股份有限公司 | Current drainage grounding device |
| CN102394389A (en) * | 2011-06-17 | 2012-03-28 | 国网电力科学研究院武汉南瑞有限责任公司 | High ferrochrome silicon electrode for direct-current grounding electrode |
| CN105552591A (en) * | 2015-08-07 | 2016-05-04 | 仲杏英 | Lightning arrester earthing device with characteristic of easy maintenance |
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| CN109980373A (en) * | 2019-04-18 | 2019-07-05 | 李兵 | A kind of maintenance earthing of lightening arrester certainly |
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Effective date of registration: 20210714 Address after: No. 1632, building 3, Hangyang international city, 131 Minzu Avenue, Qingxiu District, Nanning City, Guangxi Zhuang Autonomous Region, 530022 Applicant after: Guangxi Nanning liandun Electric Co.,Ltd. Address before: 071000 619 Yonghua North Street, lotus pool, Baoding, Hebei Applicant before: Li Dawei |
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