CN215680990U - Transmission line grounding device - Google Patents
Transmission line grounding device Download PDFInfo
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- CN215680990U CN215680990U CN202120989150.5U CN202120989150U CN215680990U CN 215680990 U CN215680990 U CN 215680990U CN 202120989150 U CN202120989150 U CN 202120989150U CN 215680990 U CN215680990 U CN 215680990U
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Abstract
The utility model relates to the technical field of power transmission equipment, in particular to a power transmission line grounding device which comprises a foundation, a conductor, a grounding downlead and a grounding body, wherein the lower end of the foundation is buried underground, the upper end of the foundation is suitable for being connected with a tower, the conductor is arranged in the foundation and comprises a main conductive rib and a first conductive connecting rib, the main conductive rib extends along the height direction of the foundation, the first conductive connecting rib is connected with the main conductive rib, the grounding downlead is arranged outside the foundation, the grounding downlead is connected with the first conductive connecting rib, the connection part of the grounding downlead and the first conductive connecting rib is suitable for being arranged close to the ground, the grounding body is suitable for being buried underground, and the grounding body is connected with the grounding downlead. The grounding device for the power transmission line can shorten the length of the grounding down lead exposed out of the ground, so that the grounding down lead is easy to be led down by being attached to the surface of a foundation, the engineering investment cost is reduced, and the power transmission safety is improved.
Description
Technical Field
The utility model relates to the technical field of power transmission equipment, in particular to a grounding device for a power transmission line.
Background
The operation safety of the power transmission line directly influences the operation of a power grid system, lightning stroke is a main reason of power transmission line accidents, and simultaneously, as the structure of the power transmission line is usually complex, once the power transmission line is subjected to lightning stroke disasters, tripping, power failure and even fire disasters are easy to occur, so that the normal operation of the power transmission line is influenced, and the life and property safety of people is endangered. The grounding device of the transmission line tower is mainly used for guiding and discharging lightning to flow into the ground so as to keep the line to have certain lightning-resistant level.
In the related art, the grounding device of the power transmission line comprises a grounding yoke plate, a grounding down lead and a grounding body, wherein the grounding body is buried underground, one end of the grounding down lead is connected with the grounding body underground in a welding mode, and the other end of the grounding down lead is connected with an above-ground tower leg through the grounding yoke plate. However, for the tower positions of the foundation to be raised such as the river channel internal tower in the power transmission line, the height of the exposed ground of the foundation main column is larger, so that the length of the exposed ground of the grounding downlead is longer, the appearance is not attractive, the grounding downlead is not easy to cling to the surface of the foundation to be led down, and the power transmission safety is influenced.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the utility model provides the power transmission line grounding device, which can shorten the length of the grounding down lead exposed out of the ground for the tower with the higher grounding main column exposed out of the ground in the power transmission line, so that the grounding down lead is easy to be attached to the surface of the foundation for down leading, the engineering investment cost is reduced, and the power transmission safety is improved.
The power transmission line grounding device according to the embodiment of the utility model comprises: the lower end of the foundation is suitable for being buried underground, and the upper end of the foundation is suitable for being connected with a pole tower; the electric conductor is arranged in the foundation and comprises a main electric conduction rib and a first electric conduction connecting rib, the main electric conduction rib extends along the height direction of the foundation, and the first electric conduction connecting rib is connected with the main electric conduction rib; the grounding down lead is arranged outside the foundation, is connected with the first conductive connecting rib, and is arranged close to the ground at the joint of the grounding down lead and the first conductive connecting rib; the grounding body is suitable for being buried underground, and the grounding body is connected with the grounding down lead.
According to the power transmission line grounding device provided by the embodiment of the utility model, for the tower with the higher ground-exposed basic main column in the power transmission line, the length of the grounding down lead exposed out of the ground can be shortened, so that the grounding down lead is easy to be closely attached to the surface of the foundation for down leading, the engineering investment cost is reduced, and the power transmission safety is improved.
In some embodiments, the power transmission line grounding device further includes a first wire connecting member, the first wire connecting member is disposed in the foundation and adjacent to the ground, one end of the first wire connecting member is connected to the first conductive connecting rib, and the other end of the first wire connecting member is connected to the grounding down conductor.
In some embodiments, the first wire connecting member has a connecting hole therein, and the connecting hole is opened toward the outside of the base.
In some embodiments, the power transmission line grounding device further includes a grounding yoke plate, the grounding yoke plate is located outside the foundation, one end of the grounding yoke plate is connected to the first wire connecting member, and the other end of the grounding yoke plate is connected to the grounding down conductor.
In some embodiments, the power line grounding device further comprises a fastener, wherein the fastener connects the grounding yoke plate and the first wire connecting piece, and at least part of the fastener is positioned in the connecting hole.
In some embodiments, one end of the grounding link plate is provided with a mounting hole, and one end of the fastening piece penetrates through the mounting hole and extends into the connecting hole.
In some embodiments, the first wire connecting piece is oppositely arranged with a first end and a second end in the height direction of the foundation, the distance between the second end of the first wire connecting piece and the ground is H, and H is more than or equal to 200mm and less than or equal to 1000 mm.
In some embodiments, the power transmission line grounding device further includes a second wire connecting member, the second wire connecting member is disposed between the tower and the foundation, at least a portion of the second wire connecting member is located in the foundation, and the second wire connecting member is disposed between the tower and the foundation.
In some embodiments, the conductive body further includes a second conductive connecting rib, the second conductive connecting rib is disposed in the base, one end of the second conductive connecting rib is connected to the second wire connector, and the other end of the second conductive connecting rib is connected to the main conductive rib.
In some embodiments, the power transmission line grounding device further comprises a foundation protection cap, the foundation protection cap is arranged between the tower and the foundation, and the second wire connecting piece is located in the foundation protection cap.
Drawings
Fig. 1 is a schematic structural diagram of a power transmission line grounding device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first wire connection unit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the connection of the first wire connection member and the grounding yoke plate according to the embodiment of the utility model.
Fig. 4 is a schematic diagram of the connection between the grounding yoke plate and the grounding down conductor according to the embodiment of the utility model.
Reference numerals:
the base 1 is provided with a plurality of supporting frames,
the conductor 2, the conductive main rib 21, the first conductive connecting rib 22, the base stirrup 23,
a grounding down lead 3, a grounding body 4,
the first wire connecting member 5, the connecting hole 51,
the grounding yoke plate 6, the mounting holes 61,
the device comprises a fastener 7, a second wire connecting piece 8, a second conductive connecting rib 9, a foundation protective cap 10 and a tower 11.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
The grounding device of the power transmission line comprises a foundation 1, a conductor 2, a grounding down conductor 3 and a grounding body 4.
The lower end of the foundation 1 is suitable for being buried underground, and the upper end of the foundation 1 is suitable for being connected with a tower 11.
It should be noted that the foundation 1 may be a concrete structure, the external shape of the foundation 1 may be adjusted as needed, the number of the foundations 1 is the same as that of the tower legs of the transmission tower 11, and the foundations 1 correspond to the tower legs of the tower 11 one by one.
Specifically, the top end of the foundation 1 is connected with the tower legs of the tower 11, and the foundation 1 can be connected with the tower foot plates on the tower legs of the tower 11 through the second wire connecting piece 8.
The electric conductor 2 is arranged in the foundation 1, the electric conductor 2 comprises a main electric conduction rib 21 and a first electric conduction connecting rib 22, the main electric conduction rib 21 extends along the height direction (the up-down direction shown in fig. 1) of the foundation 1, and the first electric conduction connecting rib 22 is connected with the main electric conduction rib 21.
It should be noted that the number of the conductors 2 may be plural, and the plural conductors 2 are provided in the plural bases 1 in a one-to-one correspondence. The material of electric conductor 2 can be the reinforcing bar, and electrically conductive main muscle 21's quantity can be a plurality of, and when electrically conductive main muscle 21's quantity was a plurality of, a plurality of electrically conductive main muscle 21 along the even interval arrangement of the circumference of basis 1, and a plurality of electrically conductive main muscle 21 link to each other through basic stirrup 23, and basic stirrup 23 establishes in the outside of electrically conductive main muscle 21, and basic stirrup 23 links to each other a plurality of electrically conductive main muscle 21 as the inside steel reinforcement cage of basis 1, can improve the intensity of basis 1.
Specifically, as shown in fig. 1, the number of the base stirrups 23 may be multiple, the multiple base stirrups 23 are arranged spirally or at intervals in the up-down direction, the first conductive connecting rib 22 is connected to any one of the multiple conductive main ribs 21, and the first conductive connecting rib 22 and the conductive main rib 21 may be connected by welding. It is understood that the connection manner of the first conductive connecting rib 22 and the conductive main rib 21 is not limited to this, and may be, for example, a snap connection capable of conducting electricity.
The grounding downlead 3 is arranged outside the foundation 1, the grounding downlead 3 is connected with the first conductive connecting rib 22, and the joint of the grounding downlead 3 and the first conductive connecting rib 22 is suitable for being arranged adjacent to the ground.
It should be noted that the number of the down conductor 3 may be multiple, and the lengths of the plurality of down conductors 3 may be the same or different, where it should be noted that the length of the down conductor 3 is related to the distance between the first wire connecting member 5 and the ground, when the distance between the first wire connecting member 5 and the ground is larger, the length of the down conductor 3 is longer, and conversely, the length of the down conductor 3 is shorter. The down conductor 3 may be galvanized round steel, it being understood that the type of the down conductor 3 is not limited thereto, and may also be galvanized flat steel, copper-clad flat steel, for example.
The grounding body 4 is suitable for being buried underground, and the grounding body 4 is connected with the grounding down lead 3.
The ground body 4 is connected to each of the plurality of ground down wires 3.
Specifically, as shown in fig. 1, the upper end of the ground down conductor 3 is connected to the first conductive connecting rib 22, and the lower end of the ground down conductor 3 is connected to the ground body 4. The grounding body 4 can be a copper-clad steel grounding rod, a copper-clad steel grounding electrode and copper-clad flat steel. It is to be understood that the type of the grounding body 4 is not limited thereto, and may be galvanized round steel, for example.
According to the power transmission line grounding device provided by the embodiment of the utility model, for towers with higher exposed ground of a basic main column in the power transmission line, the length of the grounding down lead 3 exposed out of the ground can be shortened by arranging the conductive main rib 21 and the first conductive connecting rib 22, so that the grounding down lead is easy to be closely attached to the surface of the foundation for down leading, the engineering cost is reduced, and the power transmission safety is improved.
In some embodiments, the transmission line grounding device further comprises a first wire connecting piece 5, the first wire connecting piece 5 is arranged in the foundation 1 and is adjacent to the ground, one end of the first wire connecting piece 5 is connected with the first conductive connecting rib 22, and the other end of the first wire connecting piece 5 is connected with the grounding down conductor 3.
Specifically, as shown in fig. 1, the first wire connecting member 5 is embedded in the foundation 1, one end of the first wire connecting member 5 connected to the ground lead-down wire 3 faces the outside of the foundation 1, and the first wire connecting member 5 and the first conductive connecting rib 22 can be connected by welding.
In some embodiments, the number of the first wire connectors 5 may be multiple, and the number of the first wire connectors 5 is the same as the number of the ground down conductor 3, and the multiple first wire connectors 5 correspond to the multiple ground down conductors 3 one to one.
The power transmission line grounding device provided by the embodiment of the application can realize quick, convenient and reliable connection of the first conductive connecting rib 22 and the grounding downlead 3 by arranging the first lead connecting piece 5, and improves the construction efficiency and the line safety.
In some embodiments, the first wire connecting member 5 has a connecting hole 51 therein, and the connecting hole 51 is opened toward the outside of the base 1.
It should be noted that an internal thread is provided in the connection hole 51, and the outer wall surface and the inner wall surface of the first wire connecting member 5 are provided with a zinc plating coating.
Specifically, as shown in fig. 3, the right end face of the first wire connecting member 5 is flush with the outer wall surface of the base 1.
The power transmission line grounding device provided by the embodiment of the application further improves the connection reliability of the grounding down lead 3 and the first conductive connecting rib 22 through the arrangement of the internal thread, and can perform anticorrosion and antirust treatment on the first wire connecting piece 5 through the arrangement of the galvanized coating, so that the service life of the first wire connecting piece 5 is prolonged, and the maintenance cost is reduced.
In some embodiments, the power transmission line grounding device further comprises a grounding yoke plate 6, the grounding yoke plate 6 is located outside the foundation 1, one end of the grounding yoke plate 6 is connected with the first wire connecting piece 5, and the other end of the grounding yoke plate 6 is connected with the grounding down conductor 3.
Specifically, as shown in fig. 3, the upper end of the grounding yoke plate 6 is connected to the first wire connecting member 5, one side end surface of the grounding yoke plate 6 adjacent to the foundation is attached to the outer wall surface of the foundation 1, one side end surface of the grounding yoke plate 6 adjacent to the foundation is in contact with one side end surface of the first wire connecting member 5 facing the outside of the foundation, the lower end of the grounding yoke plate 6 is connected to the ground lead-down wire 3, and the ground lead-down wire 3 is disposed on one side end surface of the grounding yoke plate 6 away from the foundation. The grounding down lead 3 is connected with the grounding yoke plate 6 by welding.
The power transmission line grounding device provided by the embodiment of the application ensures that the grounding downlead 3 is more stable and reliable to be connected with the first lead connecting piece 5 by arranging the grounding yoke plate 6, and improves the power transmission safety.
In some embodiments, the power line grounding device further comprises a fastener 7, the fastener 7 connects the grounding link plate 6 and the first wire connector 5, and at least part of the fastener 7 is located in the connecting hole 51.
It should be noted that the fastening member 7 may be a fastening bolt, and the outer circumference of the fastening bolt is provided with an external thread, and the external thread on the fastening bolt is matched with the internal thread in the connection hole 51 on the first wire connecting member 5. Specifically, the fastener 7 is an antitheft bolt with a washer, and it is understood that the type of the fastener 7 is not limited thereto, and may be, for example, a self-tightening bolt.
The transmission line earthing device of this application embodiment through setting up fastener 7, can improve the reliability of being connected of ground connection yoke plate 6 and first wire connecting piece 5, because fastener 7 can be dismantled, the later maintenance of still being convenient for.
In some embodiments, one end of the grounding link plate 6 is provided with a mounting hole 61, and one end of the fastening member 7 extends into the connecting hole 51 through the mounting hole 61.
Specifically, as shown in fig. 3 and 4, the upper end of the ground link plate 6 is provided with a mounting hole 61 penetrating through the left and right end faces of the ground link plate 6, and the left end of the fastening member 7 passes through the mounting hole 61 and extends into the connection hole 51.
In some embodiments, the first wire connecting piece 5 is oppositely arranged with a first end (such as the upper end surface of the first wire connecting piece 5 shown in fig. 1) and a second end (such as the lower end surface of the first wire connecting piece 5 shown in fig. 1) in the height direction of the foundation 1, the distance between the second end of the first wire connecting piece 5 and the ground is H, and H is more than or equal to 200mm and less than or equal to 1000 mm.
It should be noted that the distance between the center position of the first wire connector 5 in the vertical direction and the ground is h, where h is not less than 200+1/2Dmm and not more than 1000+1/2Dmm, and D is the dimension of the first wire connector 5 in the vertical direction, that is, the vertical distance between the upper end surface of the first wire connector and the lower end surface of the first wire connector.
Specifically, the distance between the lower end surface of the first wire connection member 5 and the ground may be 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, or 1000 mm. It will be appreciated that the specific distance between the first wire connection member 5 and the ground may be set according to actual needs.
The distance between the first lead connecting piece 5 and the ground is short, the length of the grounding down lead 3 exposed out of the ground can be shortened, the engineering investment cost is reduced, and the power transmission safety is improved.
In some embodiments, the power transmission line grounding device further comprises a second wire connecting piece 8, the second wire connecting piece 8 is arranged between the tower 11 and the foundation 1, at least part of the second wire connecting piece 8 is positioned in the foundation 1, and the second wire connecting piece 8 is arranged between the tower 11 and the foundation 1.
It should be noted that the second wire connecting piece 8 is located at the top of the foundation 1, the lower end of the second wire connecting piece 8 extends into the foundation 1, the second wire connecting piece 8 located in the foundation 1 is connected with the main conductive rib 21, the upper end of the second wire connecting piece 8 extends out of the foundation 1, and the second wire connecting piece 8 is used for connecting the tower leg of the tower 11 with the foundation 1. The number of the second wire connecting members 8 may be plural, and a plurality of the second wire connecting members 8 are arranged at intervals in the foundation 1.
Specifically, the second wire connecting piece 8 can be an anchor bolt, and not only can the tower legs of the tower 11 be connected with the foundation 1 by arranging the second wire connecting piece 8 to play a role in fixing the tower 11, but also can be used for conducting current.
In some embodiments, the conductive body 2 further includes a second conductive connecting rib 9, the second conductive connecting rib 9 is disposed in the foundation 1, one end of the second conductive connecting rib 9 is connected to the second wire connector 8, and the other end of the second conductive connecting rib 9 is connected to the main conductive rib 21.
Specifically, the second conductive connecting rib 9 and the second wire connecting member 8 may be connected by welding, and the second conductive connecting rib 9 and the main conductive rib 21 may be connected by welding. By arranging the second conductive connecting rib 9, the lightning current borne by the tower 11 can be conducted to the main conductive rib 21.
In some embodiments, the power line grounding device further comprises a foundation protection cap 10, the foundation protection cap 10 is arranged between the tower 11 and the foundation 1, and the second wire connecting member 8 is located in the foundation protection cap 10.
Specifically, as shown in fig. 1, the foundation protection cap 10 is disposed on the top of the foundation 1, the size of the foundation protection cap 10 is smaller than that of the foundation 1 and larger than that of the tower leg and tower foot plate, and the second wire connector 8 and the tower leg and tower foot plate are both wrapped by the foundation protection cap 10, so that the second wire connector 8 and the tower leg and tower foot plate are prevented from being exposed in the air, the second wire connector 8 and the tower leg and tower foot plate are prevented from being corroded, and the service life of the tower 11 and the second wire connector 8 and the safety of power transmission are improved.
The operation principle of the power transmission line grounding device of the embodiment of the present application is described below with reference to fig. 1 to 4.
After the transmission tower 11 bears lightning stroke, lightning current sequentially passes through tower legs of the tower 11, the second lead connecting piece 8, the second conductive connecting rib 9, the main rib 21, the first conductive connecting rib 22, the first lead connecting piece 5, the grounding yoke plate 6 and the grounding down lead 3 and finally reaches the grounding body 4, the grounding body 4 is used as a conductor which is in close contact with soil of the ground and provides electrical connection with the ground, and the energy of safe distributed lightning is discharged into the ground.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A transmission line grounding device, comprising:
the lower end of the foundation is suitable for being buried underground, and the upper end of the foundation is suitable for being connected with a pole tower;
the electric conductor is arranged in the foundation and comprises a main electric conduction rib and a first electric conduction connecting rib, the main electric conduction rib extends along the height direction of the foundation, and the first electric conduction connecting rib is connected with the main electric conduction rib;
the grounding down lead is arranged outside the foundation, the grounding down lead is connected with the first conductive connecting rib, and the joint of the grounding down lead and the first conductive connecting rib is suitable for being arranged close to the ground;
the grounding body is suitable for being buried underground, and the grounding body is connected with the grounding down lead.
2. The power transmission line grounding device of claim 1, further comprising a first wire connecting piece, wherein the first wire connecting piece is arranged in the foundation and is arranged adjacent to the ground, one end of the first wire connecting piece is connected with the first conductive connecting rib, and the other end of the first wire connecting piece is connected with the grounding down lead.
3. The power transmission line grounding device of claim 2, wherein the first wire connecting piece is provided with a connecting hole therein, and the opening direction of the connecting hole faces to the outside of the foundation.
4. The power transmission line grounding device according to claim 3, further comprising a grounding yoke plate, wherein the grounding yoke plate is located outside the foundation, one end of the grounding yoke plate is connected with the first wire connecting piece, and the other end of the grounding yoke plate is connected with the grounding down conductor.
5. The power line grounding arrangement of claim 4, further comprising a fastener connecting the grounding yoke plate and the first wire connection member, at least a portion of the fastener being located within the connection hole.
6. The power transmission line grounding device of claim 5, wherein one end of the grounding yoke plate is provided with a mounting hole, and one end of the fastening piece penetrates through the mounting hole and extends into the connecting hole.
7. The power transmission line grounding device of any one of claims 2 to 6, wherein the first wire connecting piece is oppositely provided with a first end and a second end in the height direction of the foundation, the distance between the second end of the first wire connecting piece and the ground is H, and H is more than or equal to 200mm and less than or equal to 1000 mm.
8. The power transmission line grounding device of claim 1, further comprising a second wire connector, wherein the second wire connector is arranged between the tower and the foundation, at least a portion of the second wire connector is located within the foundation, and the second wire connector is arranged between the tower and the foundation.
9. The power transmission line grounding device of claim 8, wherein the conductor further comprises a second conductive connecting rib, the second conductive connecting rib is arranged in the foundation, one end of the second conductive connecting rib is connected with the second wire connecting piece, and the other end of the second conductive connecting rib is connected with the main conductive rib.
10. The power transmission line grounding device of claim 8, further comprising a foundation protection cap, wherein the foundation protection cap is arranged between the tower and the foundation, and the second wire connecting member is located in the foundation protection cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120989150.5U CN215680990U (en) | 2021-05-10 | 2021-05-10 | Transmission line grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120989150.5U CN215680990U (en) | 2021-05-10 | 2021-05-10 | Transmission line grounding device |
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| CN215680990U true CN215680990U (en) | 2022-01-28 |
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| CN202120989150.5U Active CN215680990U (en) | 2021-05-10 | 2021-05-10 | Transmission line grounding device |
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