OPGW fiber optic cable, Optical Fiber Composite Overhead Ground Wire (also called fiber optic 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 structure has the dual functions of ground wire and communication, and is generally called OPGW optical cable.
Optical Fiber Composite Overhead Ground Wire
Also known as: fiber optic composite overhead ground wire
Features: anti-electromagnetic interference, light weight, etc.
OPGW cable is divided into: aluminum tube type, aluminum frame type and (stainless) steel tube type structure. The optical fiber is sheathed in a sleeve made of stainless steel, the sleeve is surrounded by aluminum-clad steel wire (AS), the outer layer is wrapped with aluminum alloy wire (AA), and then twisted into a cable layer by layer. Changguang Communication can design OPGW optical cable specifications according to customer requirements, the number of cores is 4-48, and the cross-sectional area is 40-150.
Knowledge of OPGW, ADSS cable and splice box
Structural properties
Adopt seamless stainless steel tube fiber protection design, the tube is filled with imported fiber paste to effectively protect the fiber;
The optical fiber can obtain a better excess length in the stainless steel tube;
Stainless steel tubular OPGW cable structure has better resistance to lateral pressure and impact;
Precisely designed optical cable section ensures the mechanical and electrical performance of the optical cable.
Application Features
OPGW is a composite product of good conductor ground wire and optical fiber communication;
Applicable to high-voltage transmission lines of 110kV and below, for new lines or replacement of original traditional ground wires;
Fiber capacity can reach 48 cores;
The mechanical and electrical characteristics of the optical cable and the conventional overhead ground wire are well matched, which is convenient for the replacement of the original old ground wire and the design and installation of the new ground wire;
OPGW can be applied to meteorological conditions of different thunderstorm levels and has excellent lightning protection performance;
OPGW can withstand high load and long span operation requirements.
OPGW optical cables use different types of optical cables according to different environments, which are mainly reflected in the cross-sectional area of opgw optical cables. opgw-24b1-50 is the type with the largest market demand. The structure will also be different. Below we will explain the three structural characteristics and applications of opgw optical cables, as follows:
1. Structural characteristics and application of OPGW optical cable with central aluminum clad stainless steel tube:
· Aluminum clad steel tube light unit increases the aluminum interface, better short-circuit current and lightning electrical characteristics
·Excellent electrochemical corrosion resistance
·Fill the blank structure design of cable diameter of 11.4-13.5mm
·Suitable for lines requiring small diameter and large short-circuit current
Extremely corrosive environment, plus coastal and chemical areas
2. Structural characteristics and application of single-layer central stainless steel tube OPGW optical cable:
Small cable diameter, light weight, small short-circuit current capacity
The optical unit forms a suitable primary fiber excess length
Poor tensile, torsional and lateral compression resistance
·Suitable for matching with GJ-35, GJ-50, GJ-70
3. Structural features and applications of two-layer twisted stainless steel tube OPGW optical cable:
Larger cable diameter and more optical fibers
Larger tensile strength and short-circuit current capacity to achieve the best balance of mechanical and electrical properties
The number of light units can be 1, currently up to 3
·The best stranding technology to obtain the excess length of the secondary fiber
·The number of stranded wires can be designed with two or three layers, and the single wire can be a combination of aluminum clad steel wire and/or aluminum alloy wire and aluminum wire.
The equipment that connects the OPGW optical cable and the optical cable is called the OPGW optical cable splice box. The function of the optical cable splice box is mainly used for the connection protection of the OPGW optical cable joint.
Structural features:
a. The fiber optic connector and excess length are stored in a laminated type, and the connector protection form is reinforced by heat shrinkable sleeves.
b. The joint box is sealed with a sealing ring and silica gel, which is easy to operate and can be opened repeatedly, and is easy to use and maintain.
c. The optical cable splice box can be grounded according to the requirements, and equipped with a special fixed mount for tower or pole.
OPGW optical cable splice box specifications and model parameters:
The overall length is 500mm, the outer diameter is 200mm, and the inner diameter is 180mm.
usage notice:
a. OPGW cable core count.
b. How many in and out and the corresponding cable diameter.
c. There are two types: for poles and for towers. If it is for poles, the diameter of the poles should be provided.
OPGW optical cable tension clamp introduction
For corner, splice, and terminal connections. The spiral aluminum-clad steel wire has extremely strong tensile strength and no concentrated stress, which protects the optical cable and assists in vibration reduction. The complete set of optical cable tensile fittings includes: outer pre-twisted wire, inner pre-twisted wire, and supporting connection fittings. The gripping force of the wire clip is not less than 95% of the rated tensile strength of the optical cable, which is convenient and fast to install and reduces the construction cost.
OPGW Optical Cable Suspension Clip
It is used for the connection of OPGW in linear poles and towers. The overhang angle of one side is 15o-18o. The combination of inner and outer helical pre-twisted wires can well protect the optical cable, without concentrated stress, avoid bending stress, and protect and auxiliary reduce the optical cable. vibration effect. The whole set of suspension clamps includes: inner and outer layers of pre-twisted wires, suspension heads and supporting connecting hardware. The gripping force of the clip is greater than 10%-20% of the rated tensile strength of the optical cable, which is convenient for installation.
Double Suspended Cable Clamp
Uses: OPGW pre-twisted wire double suspension clamp is also called double fulcrum suspension clamp. In addition to all the performance of general single suspension clamp, it can also be used for 800-1300 meters across long distance overhead lines such as rivers and canyons (power transmission). line or overhead optical cable) and towers with a turning angle of 30° to 60°.
Features: The optical cable is fixed and protected by the double fulcrum, thus ensuring the safe and reliable operation of the optical cable (conductor) in the environment of long span and large turning angle.
Ground wire usage
OPGW optical cable grounding wire is mainly used for the safety grounding of composite ground wire (OPGW) optical cable or overhead ground wire to improve the reliability of the grounding system.
Optical cable splice box is a popular name. Branch connection.
The box body is made of imported reinforced plastic, which has high strength and corrosion resistance. The terminal is suitable for the connection in the terminal room of the structural optical cable. The structure is mature, the sealing is reliable, and the construction is convenient. In actual work, the optical cable terminal box can be used as an indoor joint box, but the joint box is rarely used as an optical cable terminal box. At present, the horizontal optical cable joint box is mainly selected in the northern region, and the cap type is mainly used in the southern region. The main difference between the two is: the direction of the horizontal input and output cables is at both ends of the box;
The cap type is usually on one side of the box body. According to the laying method of the optical cable, the optical cable splice box can be selected to be suitable for various types of direct buried, pipeline, overhead straight-through or branched optical cable connections. The fixing of the optical cable and the stripping of the fiber core bundle. After the optical cable is stripped, fix the optical cable in the optical cable splice box, open and strip the fiber core bundle, and do all the preparations before the optical fiber splicing.
The core bundle tube cannot be twisted. Before fixing the optical cable, you must pay attention to the position of the core bundle tube. When the reinforcing member passes through the fixing screw, the underside of the reinforcing member must be a filling bundle tube, not a fiber core bundle tube. The core bundle tube must be in the position where the reinforcing member enters the optical fiber. The same side of the receiving tray cannot be twisted on the reinforcement.
If the reinforcement is pressed on the core bundle tube, the core bundle tube will be deformed by force, which will cause excessive loss, and the optical fibers in the core bundle tube will also be broken due to long-term stress, leaving hidden dangers to the project. Innovative vertical and clamshell structure design, the whole 12 stainless steel screws are fixed and sealed, it is the most reliable sealing joint box in China.
How to use OPGW splice box
Select the sealing ring with the smallest inner diameter according to the outer diameter of the optical cable, and put the two sealing rings on the optical cable.
Put the fiber optic cable into the corresponding entry hole.
Connect shield and ground.
Wrap the 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 gland.
Press the cable gland into the cable entry hole.
Use the throat hoop to pass through the optical cable reinforcing rib holder and the cable core support, fix the optical cable on the base of the splice box, and tighten the throat hoop screws until the throat hoop is tightened.
Tie nylon cable ties on the optical cable and cut off the excess length.
For the remaining unused optical cable holes, please seal them with plugs. Also wrap the sealing tape around the plug.
Wrap the reinforcing member around the countersunk head screw of the splice tray support and press tightly.
When splicing and coiling the fiber, be sure to stick it firmly with tape.
Buckle the cover, be sure to pay attention to the sealing ring not to squeeze and skew. All screws should be tightened to prevent the optical cable from coming out.
splice box installation
(1) The OPGW joint box is installed on the inner side of the main material of the tower, the installation height should be 8-10m, and the installation position of the whole line should be uniform.
(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.
Among the power optical cables, there is also an ADSS optical cable.
ADSS fiber optic cable
All-dielectric self-supporting optical cable is a non-metallic optical cable composed entirely of dielectric materials, including necessary support systems, and can be directly suspended on power towers. It is mainly used for communication routes of overhead high-voltage transmission systems, and can also be used for lightning Communication lines in overhead laying environments such as areas with frequent occurrences and large spans.
All Dielectric Self-Supporting Optical Fiber Cable
English abbreviation: ADSS cable
Also known as: all-dielectric self-supporting optical cable
The difference between ADSS optical cable and OPGW optical cable lies in the different structural characteristics of the two.
Structural features of ADSS optical cable:
1. The optical fiber is a loose-sleeve structure in the sleeve
2. The cable core structure is layer twist type
3. The twisting method is SZ twisting
4. The outer sheath has the function of preventing electric corrosion
5. The main load-bearing components are aramid yarn
Structural features of OPGW cable:
1. Optical fiber unit (stainless steel tube, aluminum-clad stainless steel tube)
2. Metal monofilament (aluminum-clad steel, aluminum alloy) peripheral reinforcement
The performance characteristics of ADSS optical cable:
1. The periphery of the aramid yarn is strengthened, and the ballistic resistance is good, and the fiber is not injured by shooting at a distance of about 10 meters.
2. Metal-free, anti-electromagnetic interference, lightning protection, strong electromagnetic field resistance
3. Excellent mechanical and environmental performance
4. Light weight, easy construction
5. Utilize existing towers to save line construction costs
6. It can be erected with electricity to reduce losses caused by power outages
7. Independent of the power line, easy to maintain
8. It is a self-supporting optical cable, no auxiliary hanging wire such as hanging wire is required
The performance characteristics of OPGW optical cable:
1. All metal
2. Excellent mechanical and environmental performance
3. It has a good match with the ground wire, and the mechanical and electrical properties are almost the same
4. Realize optical fiber communication, at the same time shunt short-circuit current and guide lightning current.
