CN111769381A - Multilayer rod type grounding system of lightning arrester - Google Patents
Multilayer rod type grounding system of lightning arrester Download PDFInfo
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- CN111769381A CN111769381A CN202010675066.6A CN202010675066A CN111769381A CN 111769381 A CN111769381 A CN 111769381A CN 202010675066 A CN202010675066 A CN 202010675066A CN 111769381 A CN111769381 A CN 111769381A
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- rod body
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- impeller
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- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 32
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000000463 material Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 12
- 239000000110 cooling liquid Substances 0.000 abstract description 10
- 238000007790 scraping Methods 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 7
- 239000002826 coolant Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 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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- 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
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- Elimination Of Static Electricity (AREA)
Abstract
The invention discloses a multilayer rod type grounding system of a lightning arrester, which comprises a rod body inserted into the ground, wherein the rod body is formed by alternately welding a plurality of cylindrical first layer rods and a plurality of cylindrical second layer rods, a spiral pipe is embedded in the rod body, the outer diameter of the spiral pipe is smaller than the diameter of the rod body, the difference value between the outer diameter of the spiral pipe and the diameter of the rod body is 5-10 mm, the head end and the tail end of the spiral pipe are communicated through a middle pipe, cooling liquid is filled in the spiral pipe and the middle pipe, the middle pipe is located at the axial position of the rod body, a plurality of rings of scraping blades are sleeved on the outer wall of the rod body, and the. Has the advantages that: the rod body with more oxides can obviously release heat in thunderstorm weather, the temperature of the adjacent layer rods made of different materials is lower, the temperature difference of the layer rods made of the two materials drives cooling liquid in the spiral pipe to circularly flow through the middle pipe, and the flow speed of the cooling liquid is faster when the temperature difference of the layer rods made of the two materials is larger; therefore, the impeller in the middle pipe is driven to rotate at a high speed, and the self-maintenance effect is achieved by matching with the vibration starting assembly.
Description
Technical Field
The invention relates to the technical field of electric power facilities, in particular to a multilayer rod type grounding system of a lightning arrester.
Background
The lightning arrester acts to distort the ground electric field as the lightning discharges close to the ground. A space with concentrated local electric field is formed at the top end of the lightning arrester to influence the development direction of lightning leading discharge, so as to guide lightning to discharge to the lightning rod, and then lightning current is introduced into the ground through the grounding down conductor and the grounding device, so that the protected object is prevented from being struck by lightning.
The lightning arrester in the prior art is grounded through a metal rod buried underground, but the underground environment in reality is complex, the pH value in soil is difficult to control and predict, meanwhile, various elements which oxidize the metal exist in the soil, so that the surface of the ground rod buried underground is oxidized, the surface resistance of the metal ground rod can be increased after the metal ground rod is oxidized, the electric charge on the ground rod cannot be timely and rapidly conducted to the ground, the electric charge which can be received by the top of the lightning arrester can be slowed down, the maintenance of the ground rod of the lightning arrester in the prior art can only be manually pulled out for operation, and the lightning arrester cannot achieve a good lightning protection effect after being used for one end time.
Disclosure of Invention
The invention aims to solve the problem that an arrester grounding rod in the prior art is not easy to maintain in time, and provides a multilayer rod type grounding system of an arrester.
In order to achieve the purpose, the invention adopts the following technical scheme: a multilayer rod type grounding system of a lightning arrester comprises a rod body inserted into the ground, wherein the rod body is formed by alternately welding a plurality of cylindrical first layer rods and a plurality of cylindrical second layer rods, a spiral pipe is embedded in the rod body, the outer diameter of the spiral pipe is smaller than the diameter of the rod body, the difference value between the outer diameter of the spiral pipe and the diameter of the rod body is 5-10 mm, the head end and the tail end of the spiral pipe are communicated through a middle pipe, cooling liquid is filled in the spiral pipe and the middle pipe, the middle pipe is located at the axial position of the rod body, a plurality of rings of scraping blades are sleeved on the outer wall of the rod body, and the scraping;
the middle part of the rod body is provided with a vibration starting mechanism, and the vibration starting mechanism comprises two deformation rods and an impeller which is rotatably connected inside the middle pipe through a bearing;
the two deformation rods are fixedly connected inside the two telescopic grooves, the two telescopic grooves are respectively formed in the adjacent layer rod I and the layer rod II, one end of each telescopic groove is close to the outer wall of the rod body, the other end of each telescopic groove is communicated with an inner cavity, and the inner cavity is formed in the joint of the corresponding layer rod I and the corresponding layer rod II; the inner cavity and the impeller are connected with a vibration starting assembly together.
In the multilayer rod type grounding system of the lightning arrester, the vibration starting assembly comprises a sliding plate which is connected in an inner cavity in a sliding manner, one end of the sliding plate, which is close to the telescopic groove, is abutted with a return spring, one end of the sliding plate, which is close to the impeller, is abutted with a motorized spring, and the motorized spring is fixedly connected with a baffle plate;
the utility model discloses a flexible pipe, including inner chamber and well pipe, baffle sliding connection, deformation pole, baffle and impeller, the intercommunication has a board groove between inner chamber and the well pipe, baffle sliding connection is in the board inslot, the one end that the inner chamber was kept away from to the deformation pole is connected with the inner wall fixed connection in flexible groove, the baffle is provided with locking structure jointly with the impeller, the deformation pole uses memory metal to make.
In the multilayer rod type grounding system of the lightning arrester, the locking structure comprises a sliding sleeve fixedly connected to the lower wall of the inner cavity, a locking block is connected in the sliding sleeve in a sealing and sliding manner, the upper end of the locking block is of a spring bolt structure, a locking groove matched with the locking block is formed in the lower end of the baffle, a side groove is formed in the lower side wall of the locking block, a side plate fixedly connected to the inner wall of the sliding sleeve is connected in the side groove in a sealing and sliding manner, and a trigger spring is abutted to the side plate and the upper wall of the side groove together;
the sliding sleeve intercommunication has a communicating pipe, the tie point of communicating pipe and sliding sleeve is located the upside of sideboard, the one end intercommunication of keeping away from the sliding sleeve of communicating pipe has a liquid bag, the liquid bag inlays and establishes the outer lane at the impeller, the outer wall sliding connection of impeller has a plurality of pieces of supporting.
Compared with the prior art, the invention has the advantages that:
1. in the invention, the first layer rod and the second layer rod are made of different materials, the oxidation speeds of the first layer rod and the second layer rod are different, the resistance of the oxides is also different, the rod body with more oxides can obviously release heat in thunderstorm weather, the temperature of the adjacent layer rods made of different materials is lower, the temperature difference of the two layer rods made of different materials drives cooling liquid in the spiral pipe to circularly flow through the middle pipe, and the flow speed of the cooling liquid is higher as the temperature difference of the two layer rods made of different materials is larger; thereby driving the impeller in the middle pipe to rotate at a high speed and matching with the oscillation starting assembly to finish the self-maintenance effect;
2. the centrifugal force that pivoted impeller produced makes to support piece and liquid bag and offsets, extrude the liquid in the liquid bag to sideboard upper portion space and make the locking piece move down to break away from the contact with the baffle, the baffle is launched to well intraductal by the promotion of motor spring, thereby make the coolant liquid in the well intraductal stop rapidly flowing, the liquid of rapid flow is blockked and when stopping the flow in the twinkling of an eye, then can produce obvious water hammer effect, make whole barred body produce obvious vibrations, this vibrations can make doctor-bar and barred body produce obvious relative displacement down, thereby make the doctor-bar can strike off the oxide layer of barred body outer wall, play the effect from maintaining.
3. After the temperature on the rod body is obviously reduced, the deformation rod resets without generating an extrusion effect on the sliding plate, the return spring pulls the sliding plate to reset, the motor spring is changed into a stretching state to pull the baffle out of the middle tube, and a blocking effect on fluid in the middle tube is not generated; the liquid in the liquid bag also flows back to the liquid bag under the self elastic action of the liquid bag, the locking block moves upwards under the action of the trigger spring to clamp the baffle again, and the resetting of the whole device is completed, so that the self-maintenance operation is completed again when the rod body is obviously oxidized and thunderstorm occurs next time.
Drawings
Fig. 1 is a schematic structural diagram of a multi-layer rod type grounding system of a lightning arrester according to the present invention;
FIG. 2 is an enlarged view of the structure of part A in FIG. 1;
fig. 3 is a schematic structural view of an impeller portion in a multi-layer rod type grounding system of a lightning arrester according to the present invention;
fig. 4 is a top view of an impeller portion of a multi-layered rod type ground system of a lightning arrester according to the present invention.
In the figure: 1 layer stick one, 2 layers stick two, 3 spiral pipes, 4 well pipes, 5 doctor-bars, 6 flexible grooves, 7 deformation rods, 8 inner chambers, 9 sliding plates, 10 reset springs, 11 motor-driven springs, 12 baffle plates, 13 liquid bags, 14 impellers, 15 sliding sleeves, 16 locking blocks, 17 side grooves, 18 side plates, 19 trigger springs, 20 communicating pipes and 21 abutting blocks.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1-4, a multi-layer rod type grounding system of a lightning arrester comprises a rod body inserted under the ground, wherein the rod body is formed by alternately welding a plurality of cylindrical layer rods I1 and a plurality of cylindrical layer rods II 2, the layer rods I1 and the layer rods II 2 are made of different materials, when the rod body is underground, the speeds of layer rod oxide layers made of the two materials are obviously different, a spiral pipe 3 is embedded in the rod body, the outer diameter of the spiral pipe 3 is smaller than the diameter of the rod body, the difference value between the outer diameter of the spiral pipe 3 and the diameter of the rod body is 5-10 mm, the head end and the tail end of the spiral pipe 3 are communicated through a middle pipe 4, cooling liquid is filled in the spiral pipe 3 and the middle pipe 4, the middle pipe 4 is positioned at the axial position of the rod body, a plurality of rings of scraping blades 5 are sleeved on the outer wall of the rod body, the scraping blades 5 are of hard sheet-shaped, the maintenance effect is achieved;
the middle part of the bar body is provided with a vibration starting mechanism, the vibration starting mechanism comprises two deformation rods 7 and an impeller 14 which is rotatably connected inside the middle pipe 4 through a bearing, and the impeller 14 can rotate along with the fluid when the fluid flows through the impeller 14, and the impeller can rotate like a fan which is blown by wind;
the two deformation rods 7 are fixedly connected inside the two telescopic grooves 6, the two telescopic grooves 6 are respectively arranged in a first layer rod 1 and a second layer rod 2 which are adjacent to each other, one end of each telescopic groove 6 is close to the outer wall of the rod body, the other end of each telescopic groove 6 is communicated with an inner cavity 8, the inner cavity 8 is arranged at the joint of the corresponding first layer rod and the corresponding second layer rod, the telescopic grooves 6 and the deformation rods 7 are respectively arranged in the two layer rods, when the layer rod of one metal is obviously oxidized, the layer rod can be maintained, and when the layer rod of the other metal is obviously oxidized, the other corresponding deformation rod 7 can be obviously deformed to maintain the layer rod of the other metal; the inner cavity 8 and the impeller 14 are connected with a vibration starting component together.
The vibration starting assembly comprises a sliding plate 9 which is connected in the inner cavity 8 in a sliding manner, one end of the sliding plate 9 close to the telescopic groove 6 is propped against a return spring 10, one end of the sliding plate 9 close to the impeller 14 is propped against a motor-driven spring 11, and the motor-driven spring 11 is fixedly connected with a baffle plate 12;
the inner chamber 8 and the well pipe 4 are communicated with each other to form a plate groove, the baffle 12 is connected in the plate groove in a sliding mode, one end, far away from the inner chamber 8, of the deformation rod 7 is fixedly connected with the inner wall of the telescopic groove 6, the baffle 12 and the impeller 14 are jointly provided with a locking structure, and the deformation rod 7 is made of memory metal.
The locking structure comprises a sliding sleeve 15 fixedly connected with the lower wall of the inner cavity 8, a locking block 16 is connected in the sliding sleeve 15 in a sealing and sliding manner, the upper end of the locking block 16 is of a bolt structure, a locking groove matched with the locking block 16 is formed in the lower end of the baffle plate 12, a side groove 17 is formed in the lower side wall of the locking block 16, a side plate 18 fixedly connected with the inner wall of the sliding sleeve 15 is connected in the side groove 17 in a sealing and sliding manner, and a trigger spring 19 is abutted to the side plate 18 and the upper wall of the side groove 17 together;
the sliding sleeve 15 is communicated with a communicating pipe 20, the connecting point of the communicating pipe 20 and the sliding sleeve 15 is positioned on the upper side of the side plate 18, one end of the communicating pipe 20 far away from the sliding sleeve 15 is communicated with a liquid bag 13, the liquid bag 13 is embedded in the outer ring of the impeller 14, and the outer wall of the impeller 14 is connected with a plurality of abutting blocks 21 in a sliding manner.
In the invention, the upper end of the rod body is electrically connected with the lightning arrester, the lightning arrester is positioned at a higher position until the lightning arrester extends into a cloud layer, and at the moment, the tip of the lightning arrester can release electric charges in the electric charges and the surrounding cloud layer, thereby realizing the lightning protection effect; the first layer rod 1 and the second layer rod 2 are made of different materials, the oxidation speeds of metals which are made of different materials when the metals are buried underground are different, and even if the oxidation speeds of the metals are close to each other, the resistances of the oxides of the two layers are different, so that after the two layer rods are buried underground, the surface resistances of the two layer rods are obviously different in thunderstorm weather, the tips of the lightning arrester discharge to a cloud layer, the layer rods on the ground surface inevitably have obvious charge flow with the ground, and the rod bodies generate obvious current;
and when beginning to produce obvious oxide on the stick of layer, the resistance increase of the stick of layer of this moment corresponds, during thunderstorm weather, it can obviously release heat to correspond the stick promptly, lead to the temperature on corresponding the stick to rise fast in the short time, and the layer stick of adjacent different materials then can the temperature lower, coolant liquid in the spiral pipe 3 is heated and can produce the vaporization of certain degree and promote the coolant liquid to flow, then can cool off the liquefaction when the coolant liquid flows to the lower layer stick of temperature, the layer stick temperature of a material is higher on the whole stick and when the layer stick temperature of another kind of material is lower, then can drive the coolant liquid in the spiral pipe 3 through well pipe 4 circulation flow, and the layer stick difference in temperature of two kinds of materials is big more, the velocity of flow of coolant liquid is fast more.
When the temperature of the layer rod made of one material is obviously increased, the deformation rod 7 corresponding to the telescopic groove 6 can obviously extend and extend into the inner cavity 8 to push the sliding plate 9 to move, the motor-driven spring 11 is extruded to obviously compress the deformation rod and generate obvious rightward (shown by taking figure 2 as an example) thrust on the baffle plate 12, but the baffle plate 12 in the initial state is limited by the locking block 16 and cannot generate displacement.
When the cooling liquid flows in the middle pipe 4, the impeller 14 is inevitably driven to rotate, the rotating impeller 14 drives the abutting block 21 connected with the rotating impeller in a sliding mode to move synchronously, the centrifugal force generated by the rotating impeller 14 can enable the abutting block 21 to abut against the liquid bag 13, the liquid bag 13 is pressed to extrude the liquid to the upper space of the side plate 18 through the communicating pipe 20, and the locking block 16 is driven to move downwards corresponding to the increase of the space pressure. When the oxide layer of the corresponding layer of rod on the rod body is thicker, the resistance is larger, and the corresponding temperature is higher, the flow rate of the cooling liquid in the middle pipe 4 is faster, at the moment, the supporting block 21 can also push more liquid in the liquid bag 13 to enter the upper space of the side plate 18, when the locking block 16 moves downwards to be separated from the contact with the baffle plate 12, the baffle plate 12 is pushed by the motor spring 11 to eject into the middle pipe 4, so that the cooling liquid in the middle pipe 4 stops flowing rapidly, when the rapidly flowing liquid is stopped to stop flowing instantly, the obvious water hammer effect can be generated, so that the whole rod body generates obvious vibration, the scraping blade 5 and the rod body generate obvious relative displacement under the vibration, and the scraping blade 5 can scrape the oxide layer on the outer wall of the rod body to achieve the self-maintenance effect.
After the vibration generated by the water hammer effect obviously scrapes off the oxide on the outer wall of the rod body or thunderstorm weather passes, the temperature on the rod body can be obviously reduced, the deformation rod 7 is reset to not generate an extrusion effect on the sliding plate 9, the sliding plate 9 is reset by the reset spring 10, the motor-driven spring 11 is changed into a stretching state to pull the baffle plate 12 out of the middle tube 4, and a blocking effect on the fluid in the middle tube 4 is not generated; the liquid in the liquid bag 13 also flows back into the liquid bag 13 under the self elastic action of the liquid bag 13, the locking block 16 moves upwards under the action of the trigger spring 19 to clamp the baffle plate 12 again, and the resetting of the whole device is completed, so that the self-maintenance operation is completed again when the rod body is obviously oxidized next time and thunderstorm weather occurs.
Although terms such as the first layer rod 1, the second layer rod 2, the spiral tube 3, the middle tube 4, the scraping blade 5, the telescopic groove 6, the deformation rod 7, the inner cavity 8, the sliding plate 9, the return spring 10, the motor spring 11, the baffle plate 12, the liquid bag 13, the impeller 14, the sliding sleeve 15, the locking block 16, the side groove 17, the side plate 18, the trigger spring 19, the communicating tube 20 and the abutting block 21 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 (3)
1. The multilayer rod type grounding system of the lightning arrester comprises a rod body inserted into the ground, and is characterized in that the rod body is formed by alternately welding a plurality of cylindrical first layer rods (1) and a plurality of second layer rods (2), a spiral pipe (3) is embedded in the rod body, the outer diameter of the spiral pipe (3) is smaller than the diameter of the rod body, the difference value between the outer diameter of the spiral pipe and the difference value between the outer diameter of the rod body and the difference value between the outer diameter of the spiral pipe and the inner diameter;
the middle part of the rod body is provided with a vibration starting mechanism, and the vibration starting mechanism comprises two deformation rods (7) and an impeller (14) which is rotatably connected inside the middle pipe (4) through a bearing;
the two deformation rods (7) are fixedly connected inside the two telescopic grooves (6), the two telescopic grooves (6) are respectively arranged in the adjacent layer rod I (1) and the layer rod II (2), one ends of the two telescopic grooves (6) are close to the outer wall of the rod body, the other ends of the two telescopic grooves (6) are communicated with an inner cavity (8), and the inner cavity (8) is arranged at the joint of the corresponding layer rod I and the layer rod II; the inner cavity (8) and the impeller (14) are connected with a vibration starting component together.
2. The multi-layer rod type grounding system of the lightning arrester according to claim 1, characterized in that the vibration starting assembly comprises a sliding plate (9) slidably connected in the inner cavity (8), one end of the sliding plate (9) close to the telescopic slot (6) is abutted with a return spring (10), one end of the sliding plate (9) close to the impeller (14) is abutted with a motor spring (11), and the motor spring (11) is fixedly connected with a baffle plate (12);
the utility model discloses a deformation pole, including inner chamber (8) and well pipe (4), the intercommunication has a board groove between inner chamber (8) and well pipe (4), baffle (12) sliding connection is at the board inslot, the one end that inner chamber (8) were kept away from in deformation pole (7) and the inner wall fixed connection in flexible groove (6), baffle (12) are provided with locking structure jointly with impeller (14), deformation pole (7) use memory metal to make.
3. The multilayer rod type grounding system of the lightning arrester as claimed in claim 2, characterized in that the locking structure comprises a sliding sleeve (15) fixedly connected to the lower wall of the inner cavity (8), a locking block (16) is hermetically and slidably connected in the sliding sleeve (15), the upper end of the locking block (16) is of a bolt structure, the lower end of the baffle plate (12) is provided with a locking groove matched with the locking block (16), the lower side wall of the locking block (16) is provided with a side groove (17), the side groove (17) is internally and slidably connected with a side plate (18) fixedly connected to the inner wall of the sliding sleeve (15), and the side plate (18) and the upper wall of the side groove (17) jointly abut against a trigger spring (19);
sliding sleeve (15) intercommunication has a communicating pipe (20), the tie point of communicating pipe (20) and sliding sleeve (15) is located the upside of sideboard (18), the one end intercommunication that sliding sleeve (15) were kept away from in communicating pipe (20) has a liquid bag (13), liquid bag (13) are inlayed and are established in the outer lane of impeller (14), the outer wall sliding connection of impeller (14) has a plurality of pieces of support (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675066.6A CN111769381B (en) | 2020-07-14 | 2020-07-14 | Multilayer rod type grounding system of lightning arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675066.6A CN111769381B (en) | 2020-07-14 | 2020-07-14 | Multilayer rod type grounding system of lightning arrester |
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| Publication Number | Publication Date |
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| CN111769381A true CN111769381A (en) | 2020-10-13 |
| CN111769381B CN111769381B (en) | 2021-11-09 |
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| CN202010675066.6A Active CN111769381B (en) | 2020-07-14 | 2020-07-14 | Multilayer rod type grounding system of lightning arrester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332120A (en) * | 2020-10-28 | 2021-02-05 | 罗玉敏 | Self-replacement-maintained lightning arrester grounding system |
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| CN111769381B (en) | 2021-11-09 |
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