OPGW, Optical Fiber Composite Overhead Ground Wire. Opgw, optical fiber composite overhead ground wire. The optical fiber is placed in the ground wire of the overhead high-voltage transmission line to form the optical fiber communication network on the transmission line. This kind of structure has the dual functions of ground wire and communication, and is generally called OPGW cable.

OPGW cable is divided into: aluminum tube type, aluminum skeleton type and (stainless) steel pipe type structure. The optical fiber is placed in a stainless steel sleeve surrounded by aluminum clad steel wire (AS) and wrapped in aluminum alloy wire (AA), which is then twisted into a cable. Changguang communication can design OPGW cable specifications according to customer requirements, core number 4-48, cross-sectional area 40-150 can be.

Structural characteristic

Seamless stainless steel tube optical fiber protection design, tube filled with imported fiber paste, effective protection of optical fiber;

Optical fiber in stainless steel tube can obtain better residual length;

Stainless steel tube type OPGW cable structure has better side pressure resistance and impact resistance;

The precise design of the optical cable section ensures the mechanical and electrical properties of the optical cable.

Application characteristics

OPGW is a composite product of good conductor ground wire and optical fiber communication.

Suitable for 110kV and below high voltage transmission lines, for new lines or to replace the original traditional ground wire;

Optical fiber capacity up to 48 core;

The mechanical and electrical characteristics of optical cable and conventional overhead ground wire match well, convenient for the replacement of the original old ground wire and the design and installation of new ground wire;

OPGW can apply to different thunderstorm levels of meteorological conditions, with excellent lightning protection performance;

OPGW can withstand high load and long span operation requirements.

opgw cable according to the different environment, the cable model is not the same, mainly reflected in the cross-sectional area of opgw cable, OPGW-24B1-50 is the largest market demand for a model, and according to the specific circumstances of the project environment, opgw cable structure will also be different, Here we make a certain description of the three structural characteristics and applications of opgw cable, as follows:

1, center aluminum clad stainless steel tube OPGW cable structure characteristics and application:

· Aluminum clad steel pipe optical unit increases aluminum interface, better short circuit current and lightning electrical characteristics

· Excellent electrochemical corrosion resistance

· Fill the blank structure design with cable diameter of 11.4-13.5mm

· Suitable for lines requiring small diameter and large short circuit current

· Extreme corrosive environment, plus coastal and chemical areas

2, single layer center stainless steel tube OPGW cable structure characteristics and application:

· Small cable diameter, light weight, small short circuit current capacity

· The optical unit forms an appropriate primary fiber residual length

· Poor tensile, torsional and lateral compression resistance

· Suitable for matching with GJ-35, GJ-50 and GJ-70

3, two layers of twisted stainless steel tube OPGW cable structure characteristics and application:

· Larger cable diameter and more optical fibers

· Large tensile strength and short circuit current capacity, achieving the best balance between mechanical and electrical performance

· The number of optical units can be 1, up to 3 at present

· The best stranded technology to obtain the secondary fiber residual length

· Two or three layers of stranded wire can be designed. The single wire can be aluminum clad steel wire and/or a combination of aluminum alloy wire and aluminum wire.

OPGW cable and cable docking equipment called OPGW cable connector box, cable connector box function: mainly used for OPGW cable connector connection protection.

Structural features:

a. The optical fiber connector and its remaining length are laminated fiber storage, and the connector protection mode is heat shrink sleeve reinforcement.

b. The joint box is sealed with sealing ring and silicone, which is easy to operate and can be opened repeatedly, convenient to use and maintain.

c. The cable connector box can be grounded according to the requirements, and equipped with a special tower or pole fixed mounting rack.

OPGW cable connector box specifications model parameters:

Total length 500mm, outer diameter 200mm, inner diameter 180mm.

Instructions for use:

a. Number of cores of the OPGW cable.

b. The number of inlet and outlet and corresponding cable diameter.

c. There are two kinds of split rod and tower. If it is used for rod, the rod diameter should be provided.

Introduction of OPGW cable tensioning clip

For Angle, connection, and terminal connection. Spiral aluminum clad steel wire has a strong tensile strength, no concentrated stress, to protect the cable and auxiliary vibration reduction role. The whole set of optical cable tensile gold includes: tensile outer prestranded wire, inner prestranded wire, supporting connecting gold. Clamp grip strength is not less than 95% of the cable rated tensile strength easy installation, fast, reduce the construction cost.

OPGW cable overhang clamp

Used for the connection of OPGW in the linear tower, unilateral overhang Angle of 15o-18o, the combination of the inner and outer layers of spiral prestranded wire can be very good protection cable, no concentrated stress, avoid bending stress, to protect the cable and auxiliary vibration reduction. The whole set of overhanging clamp includes: inner and outer layer of pre-stranded wire, hanging head and supporting connecting fittings. Clamp grip strength is greater than the cable rated tensile strength of 10%-20%, easy installation.

Double overhang clamp

Purpose: OPGW prestranded double overhanging wire clip also known as double fulcrum overhanging wire clip, in addition to all the performance of the general single overhanging wire clip, it can also be used for 800 ~ 1300 meters across rivers, gorges and other long distance overhead lines (power lines or aerial cable) and Angle up to 30° ~ 60° on the tower.

Features: The cable is fixed and protected by the double fulcrum support, so as to ensure the safe and reliable operation of the cable (conductor) in the long span and large Angle environment.

Ground wire use

OPGW cable ground cables are mainly used for safety grounding of composite ground cables (OPGW) or overhead ground cables to improve the reliability of the grounding system.

Cable connector box is a popular name, known as the cable connection box, also known as the cable connection package, cable connector package and barrel, mainly applicable to a variety of structures of cable overhead, pipeline, direct buried laying methods of direct and branch connection. The box body is made of imported reinforced plastic, high strength, corrosion resistance, the terminal is suitable for the structure of the cable terminal room connection, mature structure, reliable sealing, convenient construction. Cable terminal box can be used as indoor connector box in the actual work, but the connector box is rarely used as cable terminal box. At present, the horizontal cable connector box is chosen in the northern region, and the cap type is the main one in the southern region. The main difference between the two is: horizontal in and out of the optical cable direction in the box body at both ends; The cap is usually on one side of the box body. According to the laying mode of the cable, the cable connector box can be used for all kinds of directly buried, pipeline, overhead through or divided cable connection. The fixing of optical cable and the stripping of fiber core beam tube. After the optical cable is peeled, the optical cable is fixed in the optical cable connector box, and the core beam tube is peeled to do the preparatory work before the optical fiber welding. Core beam tube cannot be twisted. Before fixing the cable, we must pay attention to the position of the fiber core beam tube, strengthening parts through the fixing screws, strengthening parts below must be filled beam tube, can not be the fiber core beam tube, the fiber core beam tube must be in the same side of the strengthening parts into the fiber receiving plate, can not be twisted in the strengthening parts. If the reinforcement is pressed on the fiber core beam tube, the fiber core beam tube stress deformation will cause excessive loss, the fiber in the fiber core beam tube will also be broken due to long-term stress, leaving hidden dangers to the project cable box, innovative vertical and clamshell type structure design, the whole 12 stainless steel screws fixed seal, is the most reliable sealing joint box.

OPGW adapter box use method

Select the minimum inner diameter of the sealing ring according to the cable diameter, and the two sealing rings on the cable.

Put the cable into the corresponding entry hole.

Connect shielding and grounding.

Wrap self-adhesive sealing tape between the two sealing rings so that the sealing tape is flush with the outer diameter of the sealing ring to form a cable sealing end.

Press the cable seal end into the cable entry hole.

The cable is fixed on the bottom seat of the joint box with the throat hoop through the cable reinforcement fixing seat and cable core bracket, tighten the throat hoop screw until the throat hoop is tightened.

Tie a nylon cable tie to the cable and cut off the remaining length.

Seal other unused cable holes with plugs. Wrap sealing tape around the plug as well.

The strengthening member is wound on the countersunk screw of the weld plate support and pressed tightly.

Weld and coil the fiber, be sure to use adhesive tape firmly.

Buckle the cover, be sure to pay attention to the sealing ring do not squeeze skew. The screws should be tightened to prevent the cable from slipping out.

Joint box mounting

(1) OPGW joint box is installed on the inside of the tower main material, the installation height should be 8-10m, and the installation position of the whole line should be unified.

(2) The inlet and outlet lines of the joint box should be smooth and smooth, and the bending radius should not be less than the design and manufacturer's regulations.

In the power cable, there is another kind of ADSS cable.

ADSS optical cable

All-dielectric self-supporting optical cable is a kind of non-metallic optical cable composed of all dielectric materials, including the necessary support system itself, which can be directly suspended on the power tower. It is mainly used for the communication route of the overhead high-voltage transmission system, and can also be used for the communication line in the lightening prone area, large span and other overhead laying environment.

The difference between ADSS cable and OPGW cable lies in their different structural characteristics.

Structure characteristics of ADSS optical cable:

1, the fiber in the sleeve is loose sleeve structure

2. Cable core structure is laminate type

3. Its stranding mode is SZ stranding

4, the outer sheath has the function of electric corrosion prevention

5. The main load-bearing parts are aramid yarn

OPGW cable structure characteristics:

1. Optical fiber unit (stainless steel tube, aluminum clad stainless steel tube)

2, metal wire (aluminum clad steel, aluminum alloy) peripheral strengthening

Performance characteristics of ADSS optical cable:

1, aramid yarn perimeter strengthening, good bulletproof performance, in the distance of about 10 meters shot fiber is not injured

2, no metal, anti-electromagnetic interference, lightning protection, strong electromagnetic field resistance

3, excellent mechanical and environmental performance

4, light weight, convenient construction

5. Use the existing tower to save the cost of line construction

6, electric erection, reduce the loss caused by power failure

7, and the power line independent, easy maintenance

8, belongs to the self-supporting optical cable, without the need for auxiliary hanging line

OPGW cable performance characteristics:

1. All metal

2, excellent mechanical and environmental performance

3, and the ground has a good match, mechanical and electrical performance is almost the same 4, optical fiber communication, at the same time shunt short circuit current, guide lightning current.