KR101923903B1 - Opnw replacement method for overhead line - Google Patents

Abstract

The present invention provides a method for replacing an optical fiber composite neutral line for an overhead electric line, which has a neutral line disposed on the top thereof, has a voltage line disposed below the neutral line, and includes an I-type rack fixed to an electric pole. The method comprising the steps of: providing a crossarm band, a first insulator coupler, and a second insulator; installing the crossarm band on an upper end of the I-type rack; installing the first insulator coupler on the crossarm band; separating a first insulator, which is disposed on the top of the I-type rack and has a neutral line to be replaced bound thereto, from an insulator coupler for the neutral line of the I-type rack and coupling the first insulator to the first insulator coupler; installing the second insulator on an insulator coupler for the neutral line which is disposed on the top of the I-type rack; binding and installing the optical fiber composite neutral line on the second insulator; and separating an incoming line connected to the neutral line to be replaced and connecting the incoming line to the optical fiber composite neutral line. Thus, a distribution line can be stably operated.

Description

[0001] OPNW REPLACEMENT METHOD FOR OVERHEAD LINE [0002] BACKGROUND OF THE INVENTION [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OPNW (Alternative Neutral Wire) replacement method for a machined line, and more particularly, to a replacement method for replacing a conventional metal neutral line installed on a machining line with an optical fiber composite neutral line having an optical fiber.

In recent years, high-quality communication means is indispensably required in order to stably manage power facilities scattered throughout the country and to maintain electric quality. The management of the power communication network, which is a national backbone network, requires high reliability while securing high security. The power communication network should be supplied directly to power facilities such as power stations, power transmission towers, substations, distribution lines, etc. In a former city center where power lines have been conventionally constructed as processing lines, instead of newly installing their own power communication networks, It is often used. In such a case, it is difficult to ensure security and reliability, and there is a problem that an additional expense such as a line fee is increased.

In recent years, by replacing a conventional neutral line with an optical fiber composite neutral line (hereinafter also referred to as 'OPNW'), it is possible to secure an additional space for establishing a communication network, As shown in Fig.

The conventional neutral wire is a wire in which a wire made of steel 1 is disposed at the center as shown in FIG. 1 (a) and is wrapped with a wire made of aluminum 2. The OPNW has a structure in which the optical core cable 3, The outer tube is wrapped with the wire made of aluminum (2) with the tube (4) built in the center as the center, it is possible to realize both the optical communication and the neutral wire simultaneously. Some of the wires made of aluminum (2) outside the OPNW contain steel wire (1) at the center.

It is possible to install the neutral line OPNW and the power line in the newly installed distribution line by using the conventional distribution line construction method. However, since the neutral line and OPNW are connected to the neutral line and the power line in the already used distribution line, This is very difficult.

2, an I-shaped rack 10 is placed on the electric pole 5 when it is separated by a predetermined distance from the dry material or the like, and a D-shaped rack 20 is placed on the electric pole when it is close to the dried material, (In this application, a low-voltage low-voltage line rack is referred to as an "I-type rack" and a D-shaped rack for sorting is referred to as a "D-type rack"), and the neutral line 100 is installed in the insulator at the uppermost end of each rack. In FIG. 2, a human strap and a dead end clamp in a lead line to a customer and a D-shaped rack are not shown.

Up until now, replacement work has been done in the following form.

In the case of the I-type rack (10), the replacement target neutral wire is separated from the rack, temporarily suspended by the wire bundled in the electric wire, the OPNW is connected to the corresponding position in the rack, and the lead wire connected to the replacement target neutral wire is connected to the OPNW.

In the case of the D-type rack 20, the replacement target neutral line is detached from the main body portion 21 of the rack, temporarily stood on the supporting portion 22, and then the OPNW is inserted into the corresponding position of the main body portion 21 of the D- And the lead line connected to the replacement target is connected to the OPNW.

Such a replacement operation is very dangerous in that the pulling operation of the pulling line is very dangerous because the non-fixed alternate neutral line is already connected and the tension of the pulling line or the like is already received from various directions. Since the replacement target neutral line is temporarily held in the support portion behind the body portion, And it is very difficult to connect the OPNW to the OPNW. Therefore, it is urgent to develop a safer replacement method.

In addition, the operation of moving the replacement target neutral line and installing the OPNW at that position, the operation of transferring the lead wire from the replacement target neutral line to the OPNW, and the operation of connecting or branching the optical core cable are performed separately And it takes more than several days for the work to be completed. Therefore, it is necessary to ensure that the distribution line can be operated stably without any safety problem between each operation.

The I-shaped rack and the D-shaped rack in the present application will be described on the assumption that a neutral line is arranged at the uppermost stage and a four-line rack is arranged with three power lines downward. The neutral wire and the three power lines are installed on insulators coupled to the insulator coupling portions, respectively. The number of power lines may vary depending on the wiring system.

KR 10-1131970 B, June 21, 2012, drawing 14 KR 20-0446619 Y, 2009.11.12., Drawing 5 KR 10-2016-0139216 A, 2016.12.07., Drawing 2 KR 10-0826579 B, Apr. 30, 2008, claims, drawing 3

DISCLOSURE Technical Problem The present invention has been devised to solve the problems as described above, and it is an object of the present invention to provide an OPNW capable of operating safely and easily by replacing a neutral wire with an OPNW, To be able to do so.

In the optical fiber composite neutral wire replacement method of the present invention,

 In an optical fiber composite neutral wire replacing method for a machined line including an I-shaped rack in which a neutral line is arranged at a top end and a voltage line is arranged at a bottom and fixed to a pole,

A bare iron band and a first insulator coupling portion, and a second insulator;

Providing a coarse iron band on top of the I-shaped rack;

Installing a first insulator engagement portion in a wrought iron band;

Separating the first insulator, which is disposed at the uppermost end of the I-shaped rack and bound to the replacement target neutral line, to the first insulator coupling portion of the I-shaped rack;

Providing a second insulator to the insulator engagement portion for the neutral wire disposed at the uppermost end of the I-shaped rack;

Attaching a fiber optic composite neutral line to the second insulator;

And separating the lead line connected to the replacement target neutral line and connecting the lead line to the optical fiber composite neutral line.

One of the replacement methods of the present invention,

A method of replacing an optical fiber composite neutral wire of a machined line in which a neutral line is arranged at a top end, a voltage line is arranged downward, and one neutral insulator coupling section is included,

 The first and second insulator coupling portions and the second insulator;

And the second insulator is positioned on the second insulator coupling portion so that the mounting hole of the first insulator coupling portion and the insulator coupling hole and the second insulator of the second insulator coupling portion are allowed to pass through the first insulator pin, Joining the engaging portion, the second insulator engagement portion and the second insulator;

The side wall of the D-shaped rack main body portion upper side surface portion and the inserting hole of the first insulator engagement portion are aligned with each other, and the second rack pin passes through the side hole and the inserting hole of the first insulator engagement portion, Securing the first insulator engagement portion to the upper end;

Separating the replacement target neutral line from the first insulator provided at the uppermost stage of the D-type rack main body and binding the replacement target neutral line to the second insulator, and installing the second replacement insulator;

Attaching an optical fiber composite neutral line to the first insulator of the insulator coupling portion of the neutral line of the D-type rack;

And separating the lead line connected to the replacement target neutral line and connecting the lead line to the optical fiber composite neutral line.

One of the replacement methods of the present invention,

A method for replacing an optical fiber composite neutral wire in a machining line including a D-shaped rack having a neutral line at the top end and a voltage line disposed below and having a single neutral insulator coupling portion,

A first insulator and a second insulator, which can be fitted in the longitudinal direction at the upper end of the main body of the D-shaped rack and in which coupling holes for mounting the insulator coupling portion are formed; ;

Coupling the elongated bars to the top of the main body of the D-shaped rack;

Fastening the first insulator engagement portion by a first rack pin passing through a fitting hole at an upper end of the elongated iron core and a fitting hole of the first insulator coupling portion;

Attaching a first insulator provided on the insulator coupling portion of the D-type rack for the neutral line and having a replacement target neutral line bound to the first insulator coupling portion together with the replacement target neutral line;

Installing a second insulator on the insulator engagement portion of the neutral line of the D-type rack;

Binding the optical fiber composite neutral line to the second insulator;

And separating the lead line connected to the replacement target neutral line and connecting the lead line to the optical fiber composite neutral line.

One of the replacement methods of the present invention,

A method for replacing an optical fiber composite neutral wire of a machined line including a D-shaped rack in which a neutral line is arranged at a top end, a voltage line is arranged at a bottom and a first and a second neutral line insulator coupling parts,

Shaped first to fourth insulator connecting portions and third and fourth insulators;

Engaging the first insulator engagement portion and the second insulator engagement portion such that the bottom faces of the first insulator engagement portion and the second insulator engagement portion are in contact with each other and the directions of the respective side faces are at right angles;

The engaging hole of one side of the second insulator engaging portion and the engaging hole of the third insulator engaging portion are made to coincide with each other and the engaging hole of the other side of the second insulator engaging portion is made to coincide with the attaching hole of the fourth insulator engaging portion ;

The front and rear holes passing through the front and rear upper surfaces of the D-shaped rack main body portion and the inserting holes of the first insulator engagement portion are made to coincide with each other, and then the front and rear face holes are passed through the inserting holes of the first insulator engagement portion, Fixing the first to fourth insulator coupling portions to the top of the D-shaped rack main body by the fins;

After the tension of the replacement target neutral wire is relaxed by the long cable, the first and second insulators provided with the replacement target neutral wire are separated from the first and second heavy wire insulator coupling portions of the D-type rack main body, A step of moving the coupling member to the coupling unit;

Installing a third and fourth insulator and an optical fiber composite neutral wire in the insulator coupling portion for the first and second heavy wire of the D-type rack main body;

Separating the lead line connected to the medium line to be replaced and connecting the lead line to the optical fiber composite neutral line.

One of the replacement methods of the present invention,

A method for replacing an optical fiber composite neutral wire of a machined line including a D-shaped rack in which a neutral line is arranged at a top end, a voltage line is arranged at a bottom and a first and a second neutral line insulator coupling parts,

A step of joining the upper end of the main body of the D-shaped rack to the upper end of the D-shaped rack, and having an engaging hole for attaching the engaging part to the upper side, the first and second insulator coupling parts and the third and fourth insulators Wow;

Coupling the elongated wrought iron with the upper end of the main body of the D-shaped rack;

The first and second insulator engagement portions being opposed to each other by the first rack pin passing through the coupling hole of the extended crown iron and the installation hole of the first and second insulator coupling portions;

After the tension of the replacement target neutral line is relieved by the long cable, the first and second insulators provided with the replacement target neutral lines are separated from the first and second heavy wire insulator coupling portions of the D-type rack main body, A step of moving the coupling member to the coupling unit;

 Installing a third and fourth insulator and an optical fiber composite neutral wire in the insulator coupling portion for the first and second heavy wire of the D-type rack main body;

And separating the lead line connected to the replacement target neutral line and connecting the lead line to the optical fiber composite neutral line.

According to the present invention, in replacing the neutral wire with the OPNW, the operator can work more safely and easily, and the distribution line can be stably operated even if there is a delay between the respective steps of the replacement work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional neutral line and an optical fiber composite neutral line. FIG.
Fig. 2 is a view showing an example of a machining wiring line in a center. Fig.
Figs. 3 to 4 are diagrams for explaining Embodiment 1. Fig.
5 is a view showing the shape of an insulator coupling portion;
Figs. 6 to 8 are diagrams for explaining a second embodiment; Fig.
Figs. 9 and 10 are diagrams for explaining a third embodiment. Fig.
Figs. 11 and 12 are diagrams for explaining the fourth embodiment. Fig.
13 and 14 are diagrams for explaining a fifth embodiment.

Hereinafter, the present invention will be described in more detail with reference to the drawings in accordance with embodiments thereof.

In Embodiment 1, a replacement method in an I-shaped rack will be described with reference to FIGS.

The I-shaped rack 10 is provided on the electric pole 5 by a wrist band 30 as shown in Fig.

A neutral line 100 is disposed at the uppermost end of the I-shaped rack 10, and a power line 200 is disposed below the neutral line 100. Neutral line 100 and power line 200 are bound to respective low-pressure anthracite insulators.

In this application, the insulator (40) is abbreviated as a low-pressure ambulatory. The insulator 40 is coupled to the insulator coupling portion 50 by a rack pin 60. The insulator coupling portion 50 is composed of two side surfaces 51 and a bottom surface 52 which are opposed to each other in a 'C' shape as shown in FIG. 5. The two side surfaces opposed to each other are provided with insulator fastening holes 53 And a mounting hole 54 is provided on the bottom surface. The rack pins can be made in various forms such as bolts, nuts, bolts and pins.

4 is an enlarged view of a portion (A) in Fig.

To replace the neutral line, the existing replacement target neutral line 101 must be separated from the neutral line insulator coupling portion 150 of the I-type rack 10 and moved. In order to do this, first, a full band bobbin 31, a first insulator coupling portion and a second insulator are provided, and then a full band bobbin 31 is installed at the upper end of the I- The worn-iron band 31 installed is minimized in the influence of the tension of the pull-in line when the replacement target neutral line 101 is moved. When the OPNW is installed at the neutral position of the I-shaped rack, do.

Next, the first insulator coupling portion 151 is fixed to the coarse iron band 31. (Fig. 4 (a))

The first insulator 141 which is disposed on the uppermost end of the I-shaped rack 10 and to which the replacement target neutral line 101 is bound is separated from the insulator engagement portion 150 for the neutral conductor of the I-type rack 10, (151). (Fig. 4 (b)).

The second insulator 142 is provided on the insulator coupling portion 150 disposed at the uppermost end of the I-shaped rack 10 and the OPNW 102 is connected to the second insulator 142 (Fig. 4 (d)).

Then, the lead wire connected to the replacement target neutral line 101 is separated and connected to the OPNW.

In the present description, a description of the use of the link pin in the engagement of the insulator coupling portion and the insulator is omitted. However, it will be understood by those skilled in the art that, in spite of such omission, rack pins or equivalent means are used .

Through such a process, since the replacement target neutral line is fixed and stably fixed to the first insulator moved close to the original neutral line installation position, it is convenient to perform the removal operation of the lead wire, the connection or branching of the optical core cable And can be done safely.

4 (f), the replacement target neutral line 101, the first insulator coupling portion 151, the first insulator 141, the wrought iron band 31, etc. are replaced with the replacement target neutral wire 101 It is natural that all of them will be dismantled.

The following is a second embodiment for explaining a replacement method when a D-shaped rack is used for a straight line. (Figs. 6 to 8)

The D-shaped rack 20 is divided into a main body portion 21 and a support portion 22. In the main body portion 21, a power line and a neutral line, which are not shown, are connected to insulators 40 , 141 (FIG. 6).

 First, after preparing the first and second insulator coupling portions 151 and 152 and the second insulator 142,

After the second insulator 142 is positioned in the second insulator engagement portion 152, the inserting hole 151-1 of the first insulator engagement portion 151 and the second insulator engagement portion 152 of the insulator engagement portion 151 The first insulator coupling portion 151, the second insulator coupling portion 152 and the second insulator 142 (second insulator 142) through the first through-hole 152-2 and the second insulator 142 to pass therethrough, ) (Fig. 7).

8 is an enlarged side view of the portion (A) of Fig.

 The side hole 21-1 passing through the upper side surface portion of the D-shaped rack 20 body portion 21 and the inserting hole 151-2 of the first insulator coupling portion 151 are aligned with each other, The first insulator engagement portion 151 is formed on the upper end of the main body portion 21 by the second rack pin 62 passing through the insulator fastening hole 151-1 of the first insulator engagement portion 151-1 and the insulator fastening hole 151-2 of the first insulator engagement portion 151, (Fig. 8 (a, b)).

 The D-shaped rack 20 is detached from the first insulator 141 provided at the uppermost neutral insulator coupling portion 150 of the main body portion 21 and to which the replacement target neutral line 101 is bound, And binds to the second insulator 142. (Fig. 8 (b, c))

 The OPNW 102 is attached to the first insulator 141 of the insulator coupling portion 150 for the neutral line of the D-type rack. (Fig. 8 (d)).

The first and second insulators are fixed to the second insulator coupling portion and the insulator coupling portion for the heavy wire by the respective rack pins, and the first and second insulator coupling portions are also coupled by the rack pins.

Thereafter, the inlet line connected to the replacement target neutral line is disconnected and connected to the OPNW.

It is a matter of course that the replacement target neutral line 101, the first and second insulator coupling portions 151 and 152, and the second insulator 142 are all dismantled after replacement of the replacement target neutral line with the OPNW is completed.

Next Embodiment 3 describes another replacement method in the case where a D-shaped rack is used for a straight line (Figs. 9 and 10)

An elongated crown iron 80 is prepared which can be fitted in the longitudinal direction at the upper end of the main body of the D-shaped rack and on the upper side thereof with a coupling hole for mounting the insulator coupling portion. Further, the first insulator coupling portion and the second insulator are prepared.

 The extended wrought iron 80 is engaged with the upper end of the main body 21 of the D-shaped rack 20 as shown in Fig. In the present embodiment, the extended wrought iron 80 is inserted into the wing-shaped frame constituting the main body portion 21 (Fig. 10 (a)). However, The elongated bars and the main body portion may be combined.

 The first insulator coupling portion 151 is formed by the first insulator coupling portion 151 and the first insulator coupling portion 151. The first insulator coupling portion 151 is formed by the first insulator coupling portion 151 and the first insulator coupling portion 151, 151 are fastened to the elongated wrought iron 80 (Fig. 9). In FIG. 9, a neutral line, a power line, and a pole are not shown.

The first insulator 141 provided on the insulator coupling portion 150 for the neutral line of the D type rack and to which the replacement target neutral line 101 is bound is connected to the first insulator coupling portion 151 together with the replacement target neutral line 101 (FIG. 10 (b)), and a second insulator 142 is provided on the insulator coupling portion 150 for the neutral line of the D-type rack. (Fig. 10 (c))

The OPNW 102 is bound to the second insulator 142 and the inlet line connected to the replacement target neutral line 101 is separated and connected to the OPNW 102.

It is a matter of course that all of the replacement target neutral line 101, the elongated wrought iron 80, the first insulator coupling portion 151 and the first insulator 141 are removed after replacement of the replacement target neutral line with the OPNW is completed will be.

Embodiment 4 describes a replacement method when a D-type rack is used as a built-in type.

When used as a built-in type, a pair of insulator coupling portions are provided on both sides of the main body of the D-shaped rack to connect the neutral wire and each power line. The insulator is provided with an insulator, which is connected to the human strap 210 and the dead-end clamp 220, and the dead-end clamp is connected to the neutral wire or the power line. The wire connected to the dead end clamp coupled with the one insulator is connected to the dead end clamp connected to the other insulator (FIG. 12).

In the present application, when the D-shaped rack is used for the interior, the neutral wire and the power wire are supported and fixed to the insulator through the human strap and the dead end clamp by means of installing the neutral wire and the power wire in the insulator.

First to fourth insulator coupling portions 151, 152, 153 and 154, and third and fourth insulators 143 and 144, respectively.

As shown in FIG. 11, the bottom surfaces of the first and second insulator-engagement portions 151 and 152 are brought into contact with each other, and the side surfaces of the first and second insulator-engagement portions 151 and 152 are coupled at right angles. It is a matter of course that such a coupling is made by a rack pin (not shown) passing through the mounting hole 54 of each floor surface.

Next, the engaging hole 53-1 of one side of the second insulator engaging portion 152 is engaged with the attaching hole 54 of the third insulator engaging portion 153, The engaging hole 53-2 on the other side of the engaging portion 152 is engaged with the engaging hole 54 of the fourth engaging portion 154 by engaging. It is to be understood that such a coupling is made by a rack pin, and it is to be understood that the coupling is made by a rack pin even if there is no description of the coupling of the coupling portion and the coupling.

The front and rear holes 21-2 passing through the upper and lower front surfaces of the upper portion of the D-shaped rack body 21 and the inserting holes 53 of the first inserting portion 151 are aligned with each other, Shaped rack body portion 21 by the first rack pins 61 passing through the inserting holes 53 of the first and second insulator coupling portions 151 and 21-2 and the first insulator coupling portion 151, The portions 151 to 154 are fixed (Fig. 12 (a, b)).

After the tension of the replacement target neutral line is relieved by the long-chain line, the tension of the replacement target neutral line 101 in the first and second heavy line insulators 150-1 and 150-2 of the D- The first and second insulators 141 and 142 are separated from each other and moved to the third and fourth insulator coupling portions 153 and 154, respectively (FIG. 12 (c)).

The third and fourth insulators 143 and 144 and the OPNW are provided on the insulator coupling portions 150-1 and 150-2 for the first and second heavy wire of the D-type rack main body portion (Fig. 12 (d, e)). Then, the lead wire connected to the replacement medium line is separated and connected to the OPNW.

Embodiment 5 describes another replacement method in the case where a D-shaped rack is used for a built-in type.

An elongated wrought iron 80 which can be fitted in the longitudinal direction at the upper end of the main body 21 of the D-shaped rack 20 and in which an engaging hole 81 for mounting the engaging portion is formed is provided on the upper side thereof . The first and second insulator coupling portions 151 and 152 and the third and fourth insulators 143 and 144 are prepared (FIG. 13).

After joining the elongated wrought iron 80 to the upper end of the main body 21 of the D-shaped rack (Fig. 14 (a)),

The first and second engaging portions 81 and 82 are separated by the first rack pin 61 passing through the engaging hole 81 at the upper end of the elongated bar 80 and the attaching hole 54 of the first and second inserting portions 151 and 152 151 and 152 are provided so as to be opposed to each other with the extended wrought iron 80 as a center.

After the tension of the replacement target neutral line is relieved by the long-chain line, the replacement target neutral line 101 is installed in the first and second heavy line insulator coupling portions 150-1 and 150-2 of the D-type rack main body portion 21 The first and second insulators 141 and 142 are separated from each other and moved to the first and second insulator coupling portions 151 and 152, respectively (FIG. 14 (b)).

  The third and fourth insulators 143 and 144 are provided in the insulator coupling portions 150-1 and 150-2 for the first and second heavy wire of the D-type rack main body portion 21 (Fig. 14 (c)) and the optical fiber composite neutral wire After installation (Fig. 14 (d)), the lead wire connected to the replacement target neutral wire is disconnected and connected to the OPNW.

It is to be understood that the invention is not limited to the above-described embodiment, but, on the contrary, the scope of the present invention falls within the scope of the present invention when the constitution of the present invention is replaced with other constitutional equivalents.

5: electric pole 10: I-type rack 20: D-type rack
21: main body portion 22: support portion 21-1: side hole 21-2: front and rear holes
30, 31: rope band 40: insulator 50: insulator coupling portion 51: side surface 52: bottom surface
53, 53-1, 53-2, 151-2, 152-2: insulator fastening holes 54, 151-1:
60: rack pin 61: first rack pin 62: second rack pin
80: Extended rods 81: Coupling hole
100: Neutral line 101: Replacement target neutral line 102: Optical fiber composite neutral line
141: 1st insider 142: 2nd insider 143: 3rd insider 144: fourth inserver
150: Neutral wire insulator coupling parts 150-1 and 150-2: First and second neutral wire insulator coupling parts
151, 152, 153, 154: first, second,
200: power line 210: human strap 220: dead end clamp

Claims (5)

delete delete delete A method for replacing an optical fiber composite neutral wire of a machined line including a D-shaped rack in which a neutral line is arranged at a top end, a voltage line is arranged at a bottom and a first and a second neutral line insulator coupling parts,
Shaped first to fourth insulator connecting portions and third and fourth insulators;
Engaging the first insulator engagement portion and the second insulator engagement portion such that the bottom faces of the first insulator engagement portion and the second insulator engagement portion are in contact with each other and the directions of the respective side faces are at right angles;
The engaging hole of one side of the second insulator engaging portion and the engaging hole of the third insulator engaging portion are made to coincide with each other and the engaging hole of the other side of the second insulator engaging portion is made to coincide with the attaching hole of the fourth insulator engaging portion ;
The front and rear holes passing through the front and rear upper surfaces of the D-shaped rack main body portion and the inserting holes of the first insulator engagement portion are made to coincide with each other, and then the front and rear face holes are passed through the inserting holes of the first insulator engagement portion, Fixing the first to fourth insulator coupling portions to the top of the D-shaped rack main body by the fins;
After the tension of the replacement target neutral wire is relaxed by the long cable, the first and second insulators provided with the replacement target neutral wire are separated from the first and second heavy wire insulator coupling portions of the D-type rack main body, A step of moving the coupling member to the coupling unit;
Installing a third and fourth insulator and an optical fiber composite neutral wire in the insulator coupling portion for the first and second heavy wire of the D-type rack main body;
Separating the lead-in line connected to the medium line to be replaced and connecting the lead-in line to the optical fiber composite neutral line. delete

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