CN114856408A - Folding arm ladder for equipotential live working of power transmission line and use method - Google Patents
Folding arm ladder for equipotential live working of power transmission line and use method Download PDFInfo
- Publication number
- CN114856408A CN114856408A CN202210451452.6A CN202210451452A CN114856408A CN 114856408 A CN114856408 A CN 114856408A CN 202210451452 A CN202210451452 A CN 202210451452A CN 114856408 A CN114856408 A CN 114856408A
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- China
- Prior art keywords
- ladder
- ladder body
- folding arm
- equipotential
- power transmission
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Classifications
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
- E06C1/383—Foldable ladders in which the longitudinal members are brought together on folding
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/02—Ladders in general with rigid longitudinal member or members
- E06C1/34—Ladders attached to structures, such as windows, cornices, poles, or the like
- E06C1/36—Ladders suspendable by hooks or the like
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/50—Joints or other connecting parts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Abstract
The invention discloses a folding arm ladder for equipotential live-line work of a power transmission line and a using method thereof, relates to the technical field of electric power facilities, solves the problems that no reliable bearing hanging point exists in equipotential work and a flat ladder is poor in stability in the process of entering a power field, improves the safety of maintainers, and has the following specific scheme: including first ladder body, second ladder body and be used for connecting the rotation connecting piece of first ladder body and second ladder body, the vertical setting of first ladder body is the angle setting between second ladder body and the first ladder body, and first ladder body, second ladder body all can be dismantled with the rotation connecting piece and be connected.
Description
Technical Field
The invention relates to the technical field of electric power facilities, in particular to a folding arm ladder for equipotential live working of a power transmission line and a using method thereof.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The method for entering the electric field in the equipotential operation of the power transmission line mainly comprises the following four methods: and entering an electric field along the insulating rope ladder, entering the electric field along the strain insulator string, entering the electric field along the insulating hanging basket, and entering the electric field along the insulating flat ladder. The most common approach to entering the electric field in lines at 220kV and below is along an insulated rope ladder and along an insulated flat ladder.
The inventor finds that the method of the insulating rope ladder entering the electric field has the safety risk because the combined gap is difficult to grasp; the existing insulating flat ladder or the improved insulating flat ladder needs to have a bearing point on a lead when entering an electric field, so that the defects of non-bearing components such as an equipotential processing drainage wire or the defects of risks after the lead bears the force can not be processed equipotential by using bearing tools such as the insulating flat ladder, and the application place is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a folding arm ladder for equipotential live-line work of a power transmission line and a using method thereof, and solves the problems that no reliable bearing hanging point exists in equipotential work and a horizontal ladder is poor in stability in the process of entering a power field.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a folding arm ladder for equipotential live working of a power transmission line, which comprises a first ladder body, a second ladder body and a rotating connecting piece for connecting the first ladder body and the second ladder body, wherein the first ladder body is vertically arranged, the second ladder body and the first ladder body are arranged at an angle, and the first ladder body and the second ladder body are detachably connected with the rotating connecting piece.
As a further implementation mode, the end parts, far away from the rotating connecting piece, of the first ladder body and the second ladder body are fixedly provided with plug-in type connectors.
As a further implementation manner, the first ladder body and the second ladder body are both composed of two main materials and a plurality of cross materials between the main materials, and the distance between the cross material at the lowest part of the first ladder body and the adjacent cross material above the first ladder body is larger than the distance between the other two adjacent cross materials.
As a further implementation manner, the rotating connecting piece is composed of a rotating disk and connecting flat irons, and the upper part and the lower part of the rotating disk are fixedly connected with the two oppositely arranged connecting flat irons.
As a further implementation manner, the rotating disc is composed of two disc assemblies coaxially arranged up and down, and the center positions of the two disc assemblies are connected through a fixing bolt.
As a further implementation mode, two arc-shaped grooves which are oppositely arranged are formed in each disc assembly, and the arc-shaped grooves in the two disc assemblies are arranged in a hollow manner.
As a further realization mode, the two arc-shaped grooves of the upper disc component are respectively connected with the arc-shaped grooves on the lower disc component through a fastening bolt.
As a further implementation manner, the first ladder body and the second ladder body are respectively provided with scale marks arranged along the length direction thereof.
In a second aspect, the invention provides a use method of a folding arm ladder for equipotential live working of a power transmission line, which specifically comprises the following steps: the upper end of the first ladder body is fixedly arranged on the cross arm by using the binding rope, the second ladder body is placed on the tower body of the iron tower, and one end, far away from the rotating connecting piece, of the second ladder body is fixed on the angle iron of the tower body of the iron tower by using the binding rope.
As a further implementation mode, when the lengths of the first ladder body and the second ladder body of the folding arm ladder are insufficient, the end parts, far away from the rotating connecting piece, of the first ladder body and the second ladder body are inserted with the insulating ladder.
The beneficial effects of the invention are as follows:
(1) the first ladder body and the second ladder body of the folding arm ladder are connected by the rotary connecting piece, the design of the folding arm ladder enables two stress points to be positioned on a tower, the problems of no reliable bearing hanging point in equipotential operation and the stability of the flat ladder in the process of entering a power field are effectively solved, and the arrangement of the rotary connecting piece enables the relative positions of the first ladder body and the second ladder body to be changed according to actual requirements, so that the adaptability of the folding arm ladder is greatly improved.
(2) According to the invention, the plug-in type joints are arranged at the end parts of the first ladder body and the second ladder body far away from the rotating connecting piece, so that the insulators can be connected as required, and the adaptability of the folding arm ladder is further improved.
(3) The first ladder body and the second ladder body are respectively provided with the scale marks, so that the combined gap in and out of an electric field can be effectively mastered, and the insulating part can not be short-circuited by a human body in equipotential operation.
(4) The angle between the first ladder body and the second ladder body can be adjusted according to actual use scenes, and the application range of the folding arm ladder is greatly expanded.
(5) According to the invention, the turntable assembly above the rotary connecting piece and the arc-shaped groove on the turntable assembly below the rotary connecting piece are arranged in a vertically inserted manner, so that the upper turntable assembly and the lower turntable assembly can relatively rotate for 360 degrees, and the adjustment requirement of any angle can be met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic overall structure diagram of a folding arm ladder for equipotential hot-line work of a power transmission line according to one or more embodiments of the present invention;
FIG. 2 is a schematic illustration of a rotational connection in accordance with one or more embodiments of the present invention;
in the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1, a first ladder body; 2. a second ladder body; 3. rotating the connecting piece; 4. a first main material; 5. a first cross member; 6. a second main material; 7. a second cross member; 8. rotating the disc; 9. connecting flat irons; 10. a first fixing bolt; 11. a nut; 12. an arc-shaped slot; 13. an equipotential electrician working position; 14. and a second fixing bolt.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As described in the background art, the method of entering the electric field by the insulating rope ladder has the disadvantages that the combination gap is difficult to grasp and the safety risk exists; the invention provides a folding arm ladder for equipotential live working of a power transmission line and a using method thereof, aiming at solving the technical problems that the existing insulating flat ladder or the improved insulating flat ladder needs to have a bearing point on a lead when entering an electric field, so that the defects of non-bearing components such as equipotential processing drainage wires or the defects of danger after the lead bears the force and the problem that the equipotential processing cannot be carried out by using bearing tools such as the insulating flat ladder.
Example 1
In a typical embodiment of the present invention, as shown in fig. 1-2, a folding arm ladder for equipotential live working of a power transmission line is provided, which includes a first ladder body 1, a second ladder body 2, and a rotary connecting member 3 for connecting the two ladder bodies.
Wherein, the vertical setting of first ladder body 1, the horizontal setting of second ladder body 2, be the angle setting between first ladder body 1 and the second ladder body 2, the bottom of first ladder body 1 is connected rather than the tip of the second ladder body 2 that is close to through rotating connecting piece 3 to make first ladder body 1 and second ladder body 2 can rotate relatively, in order to improve the adaptability of folding arm ladder, adapt to different work scenes.
It can be understood that the first ladder body 1 and the second ladder body 2 may be perpendicular to each other to form 90 °, and may also be at other angles, and the specific angle between the two may be set according to actual requirements, which is not limited herein.
As shown in fig. 1, the first ladder body 1 is composed of two first main materials 4 and two first cross materials 5, the two first main materials 4 are oppositely arranged, the two first main materials 4 are connected through a plurality of first cross materials 5, and the plurality of first cross materials 5 are vertically arranged at intervals;
the second section of transverse auxiliary material at the lower part of the first ladder body 1 is designed to be missing, namely, the first ladder body 1 does not carry out installation on the first transverse material 5 at the installation position of the second section of first transverse material 5 from bottom to top so as to form an equipotential electrician working position 13, and operation personnel can conveniently carry out operation;
of course, it can also be understood that the distance between the first section of the transverse auxiliary material at the lower part of the first ladder body 1 and the transverse auxiliary material adjacent to the upper part of the first ladder body is larger than the distance between the other two adjacent transverse auxiliary materials.
The second ladder body 2 is composed of second main materials 6 and second cross materials 7, wherein the second main materials 6 and the vertical first main materials 4 are arranged at an angle, two second main materials 6 are arranged, the two second main materials 6 are arranged oppositely, the two second main materials 6 are connected through a plurality of second cross materials 7, and the plurality of second cross materials 7 are arranged at intervals along the length direction of the second main materials 6;
first main material 4, first horizontal material 5, second main material 6 and second horizontal material 7 all adopt the insulating tube of filling formula to make, when guaranteeing insulating ability, have still reduced the holistic quality of folding ladder, and can effectively guarantee the bearing capacity of first ladder body 1 and second ladder body 2.
In this embodiment, the lengths of the first ladder body 1 and the second ladder body 2 are both 3.5 meters, in other embodiments, the lengths of the first ladder body 1 and the second ladder body 2 may be other lengths, and the specific lengths are determined according to actual design requirements, which is not limited too much here.
As shown in fig. 2, the rotary connector 3 is composed of a rotary disk 8 and a connection flat iron 9, and the connection flat iron 9 is fixedly arranged at the upper and lower ends of the rotary disk 8.
Specifically, the rotating disc 8 is composed of two disc assemblies, each disc assembly is of a disc structure and is divided into a first disc assembly and a second disc assembly, the two disc assemblies are the same in size and are coaxially arranged from top to bottom, and the center positions of the two disc assemblies are provided with through holes for installation of the second fixing bolts 14 and connection stability between the two disc assemblies is guaranteed through the second fixing bolts 14.
The first disc assembly is positioned above the second disc assembly, two arc-shaped grooves 12 which are oppositely arranged are arranged on the first disc assembly, and the arc-shaped grooves 12 penetrate through the first disc assembly and are used for installing the first fixing bolt 10;
correspondingly, the second disc assembly is also provided with two arc-shaped grooves 12 which are oppositely arranged, the arc-shaped grooves 12 on the second disc assembly also penetrate through the second disc assembly, in order to ensure that the first disc assembly and the second disc assembly can effectively fix the positions after rotating, the two arc-shaped grooves 12 on the same disc assembly are not connected, namely, the radian of the arc-shaped grooves 12 is less than pi radian (180 degrees).
The arc-shaped grooves 12 on the first disc assembly and the second disc assembly are arranged in a vertically inserting manner, namely, the two arc-shaped grooves 12 on the second disc assembly are positioned right below the unconnected position between the end parts of the two arc-shaped grooves 12 on the first disc assembly;
the arc-shaped groove 12 on the second disc assembly is communicated with the arc-shaped grooves 12 on two sides above the second disc assembly, and the first disc assembly and the arc-shaped groove 12 on the second disc assembly are connected through a first fixing bolt 10, so that the first disc assembly and the second disc assembly can rotate 360 degrees relatively and are fixed in position.
As shown in fig. 2, a first fixing bolt 10 is respectively arranged in two arc-shaped grooves 12 on the first disc assembly, the first fixing bolt 10 penetrates through the arc-shaped grooves 12 on the first disc assembly and the second disc assembly, and a nut 11 is arranged on the first fixing bolt 10, when the first disc assembly and the second disc assembly need to rotate, the first disc assembly and the second disc assembly can be rotated only by loosening the nut 11, and the nut 11 is screwed after the first disc assembly and the second disc assembly are rotated in place, so that the fixing can be realized.
The rotating disc 8 can realize the fixation of the rotated position through three bolts, the operation is simple, and the angle can be adjusted according to the actual situation of the site before the folding arm ladder is erected; through using disc structure increase fixed area of contact, be the key of guaranteeing that the during operation rolls over arm ladder and stablize not rocking, disc diameter 200mm in this embodiment, thickness 20mm, in other embodiments, the disc structure also can be other sizes, does not do too much restriction here in the specific size.
The first disc assembly is fixedly provided with two connecting flat irons 9, the second disc assembly is also provided with two connecting flat irons 9, and the connecting flat irons 9 on the first disc assembly are arranged upwards and are used for being fixedly connected with the first ladder body 1; the connecting flat iron on the second disc assembly is arranged downwards and is used for being fixedly connected with the second ladder body 2.
Two connection band irons 9 on the same disc assembly are arranged oppositely, and the two connection band irons 9 are fixedly connected through a connecting piece to improve the supporting strength of the connection band irons 9.
In order to further improve the adaptability of the folding arm ladder, universal plug-in type joints are fixedly arranged at the end parts, far away from the rotating connecting piece 3, of the first ladder body 1 and the second ladder body 2, and when the ladder needs to be lengthened, the insulation ladder can be slowly jumped to adapt to tower shapes with different sizes.
The main materials of the first ladder body 1 and the second ladder body 2 are also provided with scale marks along the length direction thereof, so that the combined gap in the process of passing in and out the electric field can be accurately grasped.
Example 2
In another exemplary embodiment of the present invention, a method for using a folding arm ladder for equipotential live working of a power transmission line is provided, which specifically includes:
the use scene of folding arm ladder divide into general use and special use, mainly aims at because electrified position itself or defective structure is impaired, can't carry out the condition of equipotential maintenance operation through the flat ladder of installation stress point on the wire. Stress points are arranged on the cross arm and the tower body through the arm folding ladder, so that the stress points are not arranged on the lead and the stability can be ensured.
Specifically, the general use scene is mainly used for equipotential treatment of the defects of the live parts of the linear pole tower, or equipotential treatment of the defects on the drainage line of the strain pole tower:
the upper end of the first ladder body 1 is placed on the cross arm angle iron, the upper end of the first ladder body 1 is fixed on the cross arm angle iron near the upper part of the insulator by using a binding rope, the second ladder body 2 is placed on the iron tower body (can be lapped or inserted into the iron tower body), and the tail end (the end far away from the rotating connecting piece 3) of the second ladder body 2 is fixed on the angle iron of the iron tower body by using the binding rope;
the horizontal position of tower body fixed point is less than about 0.5 meter of wire, and when using like this, second ladder body 2 is 90 with first ladder body 1, and equipotential personnel can sit and get into the electric field on second ladder body 2, directly operate electrified position.
On special use scene mainly used handled strain tower, the defect at strain clamp position, for example strain clamp is overheated, and fastener inner structure is impaired or ageing, bears the ability decline of pulling force and impact, uses the horizontal ladder of hanging a little on the wire to have the high altitude to fall and the wire risk of breaking a thread:
when the multifunctional electric power tool is used, the upper end of the first ladder body 1 is fixed on angle iron on an inclined plane on a cross arm through a binding rope, the transverse second ladder body 2 is fixed on the angle iron on a lower plane of the cross arm through the binding rope, the rotary connecting piece 3 connected with the first ladder body 1 and the second ladder body 2 is close to an electrified wire as far as possible, the operation of 13 positions of an equipotential electrician working position is facilitated, and when the multifunctional electric power tool is used, the included angle between the first ladder body 1 and the second ladder body 2 is an acute angle.
The arm ladder can also be used for the operation of ground potential, specifically:
the upper end of the first ladder body 1 is placed on the cross arm angle iron, the upper end of the first ladder body 1 is fixed on the cross arm angle iron by using a binding rope, the second ladder body 2 is placed on the iron tower body, and the tail end (the end far away from the rotary connecting piece 3) of the second ladder body 2 is fixed on the angle iron of the iron tower body by using the binding rope;
during the use, first ladder body 1 is 90 degrees with second ladder body 2, and ground potential personnel can sit on second ladder body 2, shortens the distance with electrified wire, and the electrified position of use action bars operation of being convenient for, and this kind of condition mainly needs to use the action bars to the ground potential operation, and the electrified position gold utensil on the ground potential operation straight line shaft tower, and the cross arm is too long, the too far away condition of gold utensil apart from the body of the tower.
It can be understood that when the lengths of the first ladder body 1 and the second ladder body 2 of the folding arm ladder are not enough, the lengths of the first ladder body 1 and the second ladder body 2 can be increased by inserting an insulating ladder at the end parts of the first ladder body 1 and the second ladder body 2 far away from the rotating connecting piece 3, so as to meet the actual fixing requirement.
It should be noted that, in any use scenario, the operator enters the electric field through the equipotential electrical work position 13 on the first ladder body 1 to work through the first ladder body 1.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a transmission line equipotential live working is with folding arm ladder which characterized in that, includes first ladder body, the second ladder body and is used for connecting the rotation connecting piece of the first ladder body and the second ladder body, the vertical setting of the first ladder body is the angle setting between the second ladder body and the first ladder body, the second ladder body all can be dismantled with the rotation connecting piece and be connected.
2. The folding arm ladder for equipotential hot-line work of power transmission lines according to claim 1, wherein plug-in type joints are fixedly arranged at the end parts of the first ladder body and the second ladder body far away from the rotating connecting piece.
3. The folding arm ladder for equipotential live working of power transmission lines according to claim 1, wherein the first ladder body and the second ladder body are both composed of two main materials and a plurality of cross materials between the main materials, and a distance between a cross material at the lowest part of the first ladder body and an adjacent cross material above the first ladder body is larger than a distance between two other adjacent cross materials.
4. The folding arm ladder for equipotential live working of an electric transmission line according to claim 1, wherein the rotary connecting piece is composed of a rotary disc and connecting flat irons, and the upper part and the lower part of the rotary disc are both fixedly connected with the two oppositely arranged connecting flat irons.
5. The folding arm ladder for equipotential hot-line work of power transmission lines according to claim 4, wherein the rotating disc is composed of two disc assemblies coaxially arranged up and down, and the center positions of the two disc assemblies are connected through a fixing bolt.
6. The folding arm ladder for equipotential hot-line work of power transmission lines according to claim 5, wherein each disk assembly has two arc-shaped slots opposite to each other, and the arc-shaped slots of the two disk assemblies are arranged in a manner of being inserted vertically.
7. The folding arm ladder for equipotential hot-line work of power transmission lines according to claim 6, wherein the two arc-shaped grooves of the upper disc assembly are respectively connected with the arc-shaped grooves of the lower disc assembly through a fastening bolt.
8. The folding arm ladder for equipotential hot-line work of power transmission lines according to claim 1, wherein scale marks are respectively arranged on the first ladder body and the second ladder body along the length direction of the first ladder body and the second ladder body.
9. The use method of the folding arm ladder for equipotential live working of the power transmission line according to any one of claims 1 to 8 is characterized by comprising the following steps:
the upper end of the first ladder body is fixedly arranged on the cross arm by using the binding rope, the second ladder body is placed on the tower body of the iron tower, and one end, far away from the rotating connecting piece, of the second ladder body is fixed on the angle iron of the tower body of the iron tower by using the binding rope.
10. The use method of claim 9, wherein when the lengths of the first ladder body and the second ladder body of the folding arm ladder are insufficient, the insulating ladder is inserted into the end parts of the first ladder body and the second ladder body far away from the rotating connecting piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210451452.6A CN114856408A (en) | 2022-04-27 | 2022-04-27 | Folding arm ladder for equipotential live working of power transmission line and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210451452.6A CN114856408A (en) | 2022-04-27 | 2022-04-27 | Folding arm ladder for equipotential live working of power transmission line and use method |
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| Publication Number | Publication Date |
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| CN114856408A true CN114856408A (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210451452.6A Pending CN114856408A (en) | 2022-04-27 | 2022-04-27 | Folding arm ladder for equipotential live working of power transmission line and use method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202373908U (en) * | 2011-12-28 | 2012-08-08 | 湖南省电力公司湘潭电业局 | Tool for live replacement of insulator of double-loop straight-line steel tube pole |
| CN206117005U (en) * | 2016-10-21 | 2017-04-19 | 国网湖南省电力公司带电作业中心 | Get into used folding ladder of compact transmission line equipotential in -process |
| CN112736768A (en) * | 2021-01-04 | 2021-04-30 | 国网湖南省电力有限公司 | Method for entering phase electric field in compact line |
| CN213233833U (en) * | 2020-09-09 | 2021-05-18 | 南京林业大学 | Assembled node capable of adjusting lap joint angle through single-ring arc-shaped groove |
| CN112864939A (en) * | 2021-01-07 | 2021-05-28 | 国网安徽省电力有限公司淮北供电公司 | Tool for replacing damper of power transmission line |
-
2022
- 2022-04-27 CN CN202210451452.6A patent/CN114856408A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202373908U (en) * | 2011-12-28 | 2012-08-08 | 湖南省电力公司湘潭电业局 | Tool for live replacement of insulator of double-loop straight-line steel tube pole |
| CN206117005U (en) * | 2016-10-21 | 2017-04-19 | 国网湖南省电力公司带电作业中心 | Get into used folding ladder of compact transmission line equipotential in -process |
| CN213233833U (en) * | 2020-09-09 | 2021-05-18 | 南京林业大学 | Assembled node capable of adjusting lap joint angle through single-ring arc-shaped groove |
| CN112736768A (en) * | 2021-01-04 | 2021-04-30 | 国网湖南省电力有限公司 | Method for entering phase electric field in compact line |
| CN112864939A (en) * | 2021-01-07 | 2021-05-28 | 国网安徽省电力有限公司淮北供电公司 | Tool for replacing damper of power transmission line |
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