CN111244815A - Method for building three-phase lead net sealing protection device - Google Patents
Method for building three-phase lead net sealing protection device Download PDFInfo
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- CN111244815A CN111244815A CN202010065293.7A CN202010065293A CN111244815A CN 111244815 A CN111244815 A CN 111244815A CN 202010065293 A CN202010065293 A CN 202010065293A CN 111244815 A CN111244815 A CN 111244815A
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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
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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
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
Abstract
The application discloses method of setting up a three-phase wire's block protection device includes: s1, placing the three-phase old lead to be replaced into a paying-off tackle, wherein the three-phase old lead to be replaced comprises an upper-phase old lead, a middle-phase old lead and a lower-phase old lead; fixing the first ends of the plurality of net sealing protection devices on the left side lead of the lower old lead, and fixing the second ends of the plurality of net sealing protection devices on the right side lead of the lower old lead; adjusting the upper phase old lead and the middle phase old lead to be within the protection range of a plurality of net sealing protection devices; respectively replacing the upper phase old lead and the middle phase old lead by the upper phase new lead and the middle phase new lead; and fixing a plurality of net sealing protection devices on the upper phase new lead or the middle phase new lead, wherein two ends of the plurality of net sealing protection devices are respectively fixed on the left side lead and the right side lead of the upper phase new lead, or two ends of the plurality of net sealing protection devices are respectively fixed on the left side lead and the right side lead of the middle phase new lead. The technical problem that the net sealing protection device is difficult to build when the terrain is uneven is solved.
Description
Technical Field
The application belongs to the technical field of power grid equipment, and particularly relates to a building method of a three-phase wire net sealing protection device.
Background
The existing power grid has a three-phase lead, which is divided into three phases, specifically an upper phase lead, a middle phase lead and a lower phase lead; the upper phase conductor, the middle phase conductor and the right phase conductor are generally distributed in the same vertical direction of the tower, and each phase conductor comprises a left phase conductor and a right phase conductor which are positioned at two sides of the tower.
The condition of ageing or damage can appear in the three-phase wire, and the three-phase wire that appears ageing or damage can form bad wire, when the bad wire appears, needs to change bad wire to guarantee electric power normal delivery.
Because bad wire stridees across the ground object, in order to prevent that bad wire from dropping and smashing the ground object at the in-process of changing, need build the block net protection device in the top of ground object to protect the ground object. However, when the terrain is uneven, the block protection device is difficult to build.
Disclosure of Invention
In view of this, the application provides a method for building a three-phase wire blocking protection device, and solves the technical problem that the blocking protection device is difficult to build when the terrain is uneven.
The application provides a method for building a three-phase wire net sealing protection device, which comprises the following steps:
s1, placing the three-phase old lead to be replaced into a pay-off tackle, wherein the three-phase old lead to be replaced comprises an upper-phase old lead, a middle-phase old lead and a lower-phase old lead;
s2, fixing the first ends of a plurality of net sealing protection devices on the left lead of the lower old lead, and fixing the second ends of the net sealing protection devices on the right lead of the lower old lead;
s3, adjusting the upper phase old lead and the middle phase old lead to be within the protection range of a plurality of screen protection devices;
s4, replacing the upper phase old lead and the middle phase old lead with the upper phase new lead and the middle phase new lead respectively;
s5, fixing the plurality of net sealing protection devices on the upper phase new lead or the middle phase new lead, wherein two ends of the plurality of net sealing protection devices are respectively fixed on a left lead and a right lead of the upper phase new lead, or two ends of the plurality of net sealing protection devices are respectively fixed on a left lead and a right lead of the middle phase new lead;
and S6, adjusting the lower old lead to be within the protection range of the plurality of screen protection devices to complete the construction of the screen protection devices.
Alternatively,
the step S3 specifically includes:
adjusting the left side wire and the right side wire of the upper phase old wire along opposite directions so that the upper phase old wire is positioned in the protection range of the plurality of net sealing protection devices;
and adjusting the left side wire and the right side wire of the middle-phase old wire along opposite directions so that the middle-phase old wire is positioned in the protection range of the blocking protection devices.
Alternatively,
the step S4 specifically includes:
after the upper phase old lead and the upper phase new lead are connected, the upper phase old lead is pulled, so that the upper phase old lead is replaced by the upper phase new lead;
and after the middle-phase old lead and the middle-phase new lead are connected, pulling the middle-phase old lead so that the middle-phase old lead is replaced by the middle-phase new lead.
Alternatively,
the step S4 is followed by:
maintaining the slack of the upper phase old wire during the process of pulling the upper phase old wire;
maintaining the slack of the middle phase old wire during the pulling of the middle phase old wire.
Alternatively,
the step S1 is preceded by:
and S0, fixing an annular protection rope on a tower for fixing the three-phase conductor, wherein the space surrounded by the annular protection rope is penetrated by the three-phase old conductor.
Alternatively,
the step S0 is followed by:
and a flexible piece is arranged on the annular protection rope.
Alternatively,
after the step S4, the method further includes:
and pre-fixing the replaced upper phase new lead and the replaced middle phase new lead on the tower.
Alternatively,
after the step S6, the method further includes:
and fixing the upper phase new lead and the middle phase new lead on an insulator string on the tower.
Alternatively,
after the step S6, the method further includes:
and replacing the lower phase old lead with the lower phase new lead.
Alternatively,
the step S6 is followed by:
and rolling the lower phase old lead.
According to the technical scheme, the embodiment of the application has the following advantages:
according to the method, a three-phase old wire to be replaced is placed into a pay-off tackle, namely the three-phase old wire to be replaced of the three-phase old wire comprises an upper-phase old wire, a middle-phase old wire and a lower-phase old wire and is placed into the pay-off tackle, then first ends of a plurality of net sealing protection devices are fixed to a left-side wire of the lower-phase old wire, second ends of the net sealing protection devices are fixed to a right-side wire of the lower-phase old wire, the upper-phase old wire and the middle-phase old wire are adjusted to be within the protection range of the plurality of net sealing protection devices, and at the moment, the first building of; respectively replacing the upper phase old lead and the middle phase old lead by the upper phase new lead and the middle phase new lead; fixing a plurality of net sealing protection devices on the upper phase new lead or the middle phase new lead, namely fixing two ends of the plurality of net sealing protection devices on the left lead and the right lead of the upper phase new lead respectively, or fixing two ends of the plurality of net sealing protection devices on the left lead and the right lead of the middle phase new lead respectively, then adjusting the lower phase old lead into the protection range of the plurality of net sealing protection devices, and finishing the final building of the net sealing protection devices at the moment. The construction of the block protection device in the application is conducted on the lead instead of on the ground, so that the actual situation of the terrain does not need to be considered, and the construction of the block protection device is not difficult to construct due to uneven terrain.
Drawings
Fig. 1 is a schematic flow chart of a first embodiment of a building method of a three-phase wire blocking protection device in the present application;
FIG. 2 is a schematic view of the structure of the adjustment device of the present application;
FIG. 3 is a schematic view of the adjusting device for adjusting the three-phase wires according to the present application;
fig. 4 is a schematic flowchart of a second embodiment of a method for building a three-phase wire blocking protection device according to the present application;
fig. 5 is a schematic diagram of a first-time constructed state of the blocking protection device in the application;
FIG. 6 is a schematic view of a three-phase conductor after a first replacement of the old conductor with a new conductor in the present application;
fig. 7 is a schematic diagram of a second set-up state of the blocking protection device in the present application;
wherein the reference numbers are as follows: 1. a rope; 2. a first shackle; 3. a drive device; 4. a fixed pulley; 5. and (7) second shackle.
Detailed Description
The embodiment of the application provides a method for building a three-phase wire blocking protection device, and solves the technical problem of building the blocking protection device when the terrain is uneven.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to facilitate understanding, please refer to fig. 1, where fig. 1 is a schematic flow chart of a first embodiment of a building method of a three-phase wire blocking protection device in an embodiment of the present application, and as shown in fig. 1, the method specifically includes:
It should be noted that the three-phase old conductors to be replaced include an upper phase old conductor, a middle phase old conductor and a lower phase old conductor.
And 102, fixing the first ends of the plurality of net sealing protection devices on the left side lead of the lower old lead, and fixing the second ends of the plurality of net sealing protection devices on the right side lead of the lower old lead.
It should be noted that, a plurality of the screen protection devices are fixed on the lower old conductor at intervals, and the intervals of the plurality of the screen protection devices may be equal or unequal. For example, the distance between the first net-sealing protection device and the second net-sealing protection device is two meters, the distance between the second net-sealing protection device and the third net-sealing protection device is also two meters, the distance between the third net-sealing protection device and the fourth net-sealing protection device is also two meters, and the rest of the net-sealing protection devices are analogized in the same way. The plurality of net sealing protection devices can also be unevenly distributed on the lower old conductor, for example, the distance between the first net sealing protection device and the second net sealing protection device is two meters, the distance between the second net sealing protection device and the third net sealing protection device is three meters, the distance between the third net sealing protection device and the fourth net sealing protection device is five meters, and the distance between the later net sealing protection devices can be randomly set. The above arrangement can be selected by those skilled in the art according to the requirement.
Specifically, the blocking protection device in this embodiment is a rope, and when the lower spanning object is an insulator, the rope may be an insulating rope or a steel wire rope, and when the lower spanning object is a non-insulator, the rope is an insulating rope. When the rope is fixed, two ends of the rope are respectively fixed on the left side wire and the right side wire of the lower old wire. A flexible member may also be provided on the outer surface of the cord to prevent the cord from scratching the three-phase conductor. It will be appreciated that the flexible member may be a sponge or rubber, and may be arranged as desired by those skilled in the art.
And 103, adjusting the upper phase old lead and the middle phase old lead to be within the protection range of a plurality of net sealing protection devices.
In this embodiment, the adjusting device for adjusting the upper old wire and the middle old wire may be the adjusting device shown in fig. 2. In use, referring to fig. 3, one end of the rope 1 is used to fix one end of the adjusting device on the upper phase old lead or the middle phase old lead to be adjusted in cooperation with the first shackle 2, then one end of the driving device 3 and the second shackle 5 on the fixed pulley 4 are fixed on the tower, and then the driving device is pulled, so that the upper phase old lead or the middle phase old lead to be adjusted, which is fixed with the adjusting device, is pulled, and the upper phase old lead or the middle phase old lead to be adjusted is adjusted.
And step 104, replacing the upper phase old lead and the middle phase old lead with the upper phase new lead and the middle phase new lead respectively.
It should be noted that the operation of replacing the upper phase old conductor with the upper phase new conductor and the operation of replacing the middle phase old conductor with the middle phase new conductor may be performed simultaneously or separately, and those skilled in the art can flexibly set the operations.
And 105, fixing a plurality of screen protection devices on the upper phase new lead or the middle phase new lead.
It should be noted that two ends of the plurality of net sealing protection devices are respectively fixed to the left and right wires of the upper phase new wire, or two ends of the plurality of net sealing protection devices are respectively fixed to the left and right wires of the middle phase new wire.
And step 106, adjusting the lower old lead to be within the protection range of a plurality of net sealing protection devices to complete the construction of the net sealing protection devices.
In the embodiment, a three-phase old lead to be replaced is placed into a pay-off tackle, namely an upper-phase old lead, a middle-phase old lead and a lower-phase old lead which are included in the three-phase old lead to be replaced are placed into the pay-off tackle, then first ends of a plurality of net sealing protection devices are fixed on a left lead of the lower-phase old lead, second ends of the net sealing protection devices are fixed on a right lead of the lower-phase old lead, the upper-phase old lead and the middle-phase old lead are adjusted to be within a protection range of the plurality of net sealing protection devices, and at the moment, first building of the net sealing protection devices is completed; respectively replacing the upper phase old lead and the middle phase old lead by the upper phase new lead and the middle phase new lead; fixing a plurality of net sealing protection devices on the upper phase new lead or the middle phase new lead, namely fixing two ends of the plurality of net sealing protection devices on the left lead and the right lead of the upper phase new lead respectively, or fixing two ends of the plurality of net sealing protection devices on the left lead and the right lead of the middle phase new lead respectively, then adjusting the lower phase old lead into the protection range of the plurality of net sealing protection devices, and finishing the final building of the net sealing protection devices at the moment. The construction of the block protection device in the application is conducted on the lead instead of on the ground, so that the actual situation of the terrain does not need to be considered, and the construction of the block protection device is not difficult to construct due to uneven terrain.
The first embodiment of the method for building the three-phase wire blocking protection device provided by the embodiment of the application also provides a second embodiment of the method for building the three-phase wire blocking protection device provided by the embodiment of the application, and the second embodiment describes in detail the method for building the three-phase wire blocking protection device.
Referring to fig. 4, fig. 4 is a schematic flow chart of a second embodiment of a method for building a three-phase wire blocking protection device in an embodiment of the present application, and the method for building a two-pair three-phase wire blocking protection device in the embodiment includes:
It should be noted that the space surrounded by the annular protective rope is penetrated by the three-phase old conductor. In this embodiment, in order to prevent the annular protection rope from scratching the conducting wire, a flexible member may be disposed on the annular protection rope. It is understood that the flexible member may be made of sponge, polyester or cloth, and those skilled in the art can arrange the flexible member as required.
Further, the number of the annular protection ropes can be one, two or three, and the annular protection ropes can be arranged as required by a person skilled in the art.
It should be noted that the three-phase old conductors to be replaced include an upper phase old conductor, a middle phase old conductor and a lower phase old conductor.
And 203, fixing the first ends of the plurality of net sealing protection devices on the left side lead of the lower old lead, and fixing the second ends of the plurality of net sealing protection devices on the right side lead of the lower old lead.
And 204, adjusting the upper phase old lead and the middle phase old lead to be within the protection range of a plurality of net sealing protection devices.
It is understood that adjusting the upper phase old conductor and the middle phase old conductor to be within the protection range of the plurality of screen protection devices may be: the left side wire of the upper phase old wire faces the direction of the right side wire of the upper phase old wire, the right side wire of the upper phase old wire faces the direction of the left side wire of the upper phase old wire, the left side wire of the middle phase old wire faces the direction of the right side wire of the middle phase old wire, and the right side wire of the middle phase old wire faces the direction of the left side wire of the middle phase old wire until the upper phase old wire and the middle phase old wire are located in the protection range of the net sealing protection device.
And step 205, replacing the upper phase old lead and the middle phase old lead with the upper phase new lead and the middle phase new lead respectively.
Specifically, the upper phase old conductor and the middle phase old conductor may be replaced by pulling the upper phase old conductor after connecting the upper phase old conductor and the upper phase new conductor, and pulling the middle phase old conductor after connecting the middle phase old conductor and the middle phase new conductor.
And step 206, maintaining the sag of the upper phase old wire in the process of drawing the upper phase old wire.
And in the process of drawing the middle-phase old lead, maintaining the sag of the middle-phase old lead, and ensuring that the two three-phase leads are all positioned above the bottom of the net sealing protection device to prevent the three-phase leads from being positioned outside the protection range of the net sealing protection device.
And step 207, pre-fixing the replaced upper phase new conductor and middle phase new conductor on a tower.
It will be appreciated that the pre-fixing of the upper phase new conductor and the middle phase new conductor which have just been replaced is to prevent the upper phase new conductor and the middle phase new conductor from being knocked down when the lower phase old conductor is pulled and expanded during the replacement of the lower phase old conductor.
And 208, fixing a plurality of screen protection devices on the upper phase new lead or the middle phase new lead.
It should be noted that two ends of the plurality of net sealing protection devices are respectively fixed to the left and right wires of the new upper conductor, or two ends of the plurality of net sealing protection devices are respectively fixed to the left and right wires of the new middle conductor.
And 209, adjusting the lower old lead to be within the protection range of a plurality of net sealing protection devices to complete the construction of the net sealing protection devices.
It should be noted that the description of adjusting the lower old wire to the protection range of the plurality of blocking protection devices is similar to that in the step 204, and specific reference is made to the description in the step 204, which is not repeated herein.
It should be noted that the description of replacing the lower old conductive line with the lower new conductive line is similar to the description of step 205, and the specific setting refers to step 205, which is not described herein again.
And step 211, fixing the upper phase new lead and the middle phase new lead on the insulator string on the tower.
It should be noted that, when the new upper phase conductor and the new middle phase conductor are fixed on the insulator string on the tower, the three-phase old conductors are all replaced, and at this time, the three-phase conductor on the tower is the replaced three-phase new conductor.
And step 212, rolling the lower phase old conducting wire.
It can be understood that the winding manner of the upper phase old wire and the middle phase old wire can be winding after being completely replaced, or winding while pulling the new wire.
In the embodiment, the three-phase old lead to be replaced is placed into the pay-off tackle, namely the three-phase old lead to be replaced of the three-phase old lead comprises an upper-phase old lead, a middle-phase old lead and a lower-phase old lead and is placed into the pay-off tackle, then, the first ends of a plurality of net sealing protection devices are fixed on the left lead of the lower-phase old lead, the second ends of the net sealing protection devices are fixed on the right lead of the lower-phase old lead, the upper-phase old lead and the middle-phase old lead are adjusted to be within the protection range of the plurality of net sealing protection devices, and at the moment, the first building of; respectively replacing the upper phase old lead and the middle phase old lead by the upper phase new lead and the middle phase new lead; fixing a plurality of net sealing protection devices on the upper phase new lead or the middle phase new lead, namely fixing two ends of the plurality of net sealing protection devices on the left lead and the right lead of the middle phase new lead respectively, or fixing two ends of the plurality of net sealing protection devices on the left lead and the right lead of the middle phase new lead respectively, then adjusting the lower phase old lead into the protection range of the plurality of net sealing protection devices, and finishing the final construction of the net sealing protection devices at the moment. The construction of the block protection device in the application is conducted on the lead instead of on the ground, so that the actual situation of the terrain does not need to be considered, and the construction of the block protection device is not difficult to construct due to uneven terrain.
In the second embodiment of the method for building a three-phase wire-blocking protection device provided in the embodiment of the present application, an application example of the method for building a three-phase wire-blocking protection device is also provided in the following embodiment of the present application, and refer to fig. 3 to 5 specifically.
In this application example, the upper phase old conductor in the three-phase conductor is: a1 (left wire of the upper phase old wire) and a2 (right wire of the lower phase old wire), the middle phase old wires are B1 (left wire of the middle phase old wire) and B2 (right wire of the middle phase old wire), and the lower phase old wires are C1 (left wire of the lower phase old wire) and C2 (right wire of the lower phase old wire); the upper phase new conductors in the three phase conductors a1 '(left conductor of upper phase new conductor) and a 2' (right conductor of upper phase new conductor) are middle phase new conductors B1 '(left conductor of middle phase new conductor) and B2' (right conductor of middle phase new conductor), and C1 '(left conductor of lower phase new conductor) and C2' (right conductor of lower phase new conductor) are lower phase new conductors. The construction of the blocking protection device for the three-phase lead comprises the following steps:
(1) placing A1, A2, B1, B2, C1 and C2 into a placing groove of a pay-off tackle, then fixing the first end and the second end of the blocking protection device on C1 and C2 respectively, and adjusting A1, A2, B1 and B2 to be within the protection range of the blocking protection device, wherein the state of the three-phase lead at the moment is shown in FIG. 5;
(2) replacing A1, A2, B1 and B2 with A1 ', A2', B1 'and B2', respectively, wherein the states of the replaced three-phase lead are shown in FIG. 6;
(3) and (3) after the net sealing protection device is detached from the C1 and the C2, fixing the net sealing protection device on the B1 'and the B2', adjusting the C1 and the C2 to be within the protection range of the net sealing protection device, and completing the second building of the net sealing protection device, wherein the three-phase lead is shown in fig. 7.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A building method of a three-phase lead net sealing protection device is characterized by comprising the following steps:
s1, placing the three-phase old lead to be replaced into a pay-off tackle, wherein the three-phase old lead to be replaced comprises an upper-phase old lead, a middle-phase old lead and a lower-phase old lead;
s2, fixing the first ends of a plurality of net sealing protection devices on the left lead of the lower old lead, and fixing the second ends of the net sealing protection devices on the right lead of the lower old lead;
s3, adjusting the upper phase old lead and the middle phase old lead to be within the protection range of a plurality of screen protection devices;
s4, replacing the upper phase old lead and the middle phase old lead with the upper phase new lead and the middle phase new lead respectively;
s5, fixing a plurality of the screen sealing protection devices on the upper phase new lead or the middle phase new lead;
two ends of the plurality of net sealing protection devices are respectively fixed on the left side lead and the right side lead of the upper new lead;
or
Two ends of the plurality of net sealing protection devices are respectively fixed on the left side lead and the right side lead of the middle phase new lead;
and S6, adjusting the lower old lead to be within the protection range of the plurality of screen protection devices to complete the construction of the screen protection devices.
2. The method for building a three-phase conductor screen protection device according to claim 1, wherein the step S3 specifically includes:
adjusting the left side wire and the right side wire of the upper phase old wire along opposite directions so that the upper phase old wire is positioned in the protection range of the plurality of net sealing protection devices;
and adjusting the left side wire and the right side wire of the middle-phase old wire along opposite directions so that the middle-phase old wire is positioned in the protection range of the blocking protection devices.
3. The method for building a three-phase conductor screen protection device according to claim 1, wherein the step S4 specifically includes:
after the upper phase old lead and the upper phase new lead are connected, the upper phase old lead is pulled, so that the upper phase old lead is replaced by the upper phase new lead;
and after the middle-phase old lead and the middle-phase new lead are connected, pulling the middle-phase old lead so that the middle-phase old lead is replaced by the middle-phase new lead.
4. The method for constructing a three-phase conductor screen protection device according to claim 3, wherein the step S4 is followed by further comprising:
maintaining the slack of the upper phase old wire during the process of pulling the upper phase old wire;
maintaining the slack of the middle phase old wire during the pulling of the middle phase old wire.
5. The method for constructing a three-phase conductor screen protection device according to claim 1, wherein the step S1 is preceded by:
and S0, fixing an annular protection rope on a tower for fixing the three-phase conductor, wherein the space surrounded by the annular protection rope is penetrated by the three-phase old conductor.
6. The method for constructing a three-phase conductor screen protection device according to claim 5, wherein the step S0 is followed by further comprising:
and a flexible piece is arranged on the annular protection rope.
7. The method for constructing a three-phase conductor screen protection device according to claim 5, wherein after the step S4, the method further comprises:
and pre-fixing the replaced upper phase new lead and the replaced middle phase new lead on the tower.
8. The method for constructing a three-phase conductor screen protection device according to claim 7, wherein after the step S6, the method further comprises:
and fixing the upper phase new lead and the middle phase new lead on an insulator string on the tower.
9. The method for constructing a three-phase conductor screen protection device according to claim 1, wherein after step S6, the method further comprises:
and replacing the lower phase old lead with the lower phase new lead.
10. The method for constructing a three-phase conductor screen protection device according to claim 9, wherein the step S6 is followed by further comprising:
and rolling the lower phase old lead.
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| CN202010065293.7A CN111244815B (en) | 2020-01-20 | 2020-01-20 | Method for building three-phase lead net sealing protection device |
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| CN202010065293.7A CN111244815B (en) | 2020-01-20 | 2020-01-20 | Method for building three-phase lead net sealing protection device |
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