Optical Fiber Composite Overhead Ground Wire, optical fiber is placed in the ground wire of overhead high voltage transmission line to form a fiber optic communication network on the transmission line, this structure form both ground wire and communication dual function, generally known as OPGW optical fiber cable.
Name：Optical Fiber Composite Overhead Ground Wire
Features: anti-electromagnetic interference, light weight, etc.
OPGW fiber optic cable is divided into: aluminum tube type, aluminum skeleton type and (stainless) steel tube type structure. The optical fiber is put into a casing made of stainless steel, and the casing is surrounded by aluminum clad steel wire (AS) and the outer layer is wrapped with aluminum alloy wire (AA), and then the cable is twisted in layers. Long optical communication can design OPGW cable according to customer's requirements, the number of cores 4-48 cores, cross-sectional area 40-150 are available.
Structure characteristics
The seamless stainless steel tube is designed to protect the optical fiber, and the tube is filled with imported fiber paste to effectively protect the optical fiber;
The fiber can get a better residual length in the stainless steel tube;
Stainless steel tube OPGW cable structure has better resistance to lateral pressure and impact;
Precise design of cable cross-section ensures the mechanical and electrical properties of the cable.
Application characteristics
OPGW is a composite product of good conductor ground wire and fiber optic communication;
Suitable for high voltage transmission lines of 110kV and below, for new lines or replacing the existing traditional ground wire;
Fiber optic capacity can reach 48 cores;
The mechanical and electrical characteristics of the fiber optic cable and the conventional overhead ground line are well matched, which facilitates the replacement of the old ground line and the design and installation of the new ground line;
OPGW can be applied to different weather conditions of thunderstorm level and has excellent lightning protection performance;
OPGW can withstand high load and large span operation requirements.
OPGW fiber optic cable according to the environment, the use of fiber optic cable models are different, mainly in the opgw fiber optic cable cross-sectional area, opgw-24b1-50 is the largest market demand for a model, and according to the specific circumstances of the project environment, opgw fiber optic cable structure will be somewhat different, the following are the three structural features and applications of opgw fiber optic cable.
1, the center of aluminum clad stainless steel tube OPGW cable structure features and applications:
Aluminum clad steel tube optical unit increases the aluminum interface, better short-circuit current and lightning strike electrical characteristics
-Excellent electrochemical corrosion resistance
-Fill the gap structure design of 11.4-13.5mm cable diameter
-Applicable to lines requiring small diameter and large short-circuit current
-Extreme corrosive environment, plus coastal, chemical areas
2, single-layer center stainless steel tube OPGW cable structure features and applications:
-Small cable diameter, light weight, small short-circuit current capacity
-optical unit to form a suitable primary fiber residual length
-Tensile, torsional and lateral pressure resistance is poor
-Suitable with GJ-35, GJ-50, GJ-70 match
3, two-layer stranded stainless steel tube OPGW optical cable structure features and applications:
-Larger cable diameter, more optical fibers
-Tensile strength and short-circuit current capacity, to achieve the best balance of mechanical and electrical properties
-The number of optical units can be 1, the current maximum of 3
-Optimal stranding technology to obtain secondary fiber residual length
-The number of stranded layers can be designed with two or three layers, and the monofilament can be a combination of aluminum-clad steel wire and/or aluminum alloy wire and aluminum wire.
OPGW fiber optic cable and fiber optic cable docking equipment is called OPGW fiber optic cable splice box, the role of fiber optic cable splice box use: mainly used for OPGW fiber optic cable splice connection protection.
Structure features.
a. Fiber optic splice and the remaining length of the iterative storage fiber, splice protection in the form of heat-shrinkable casing reinforcement.
b. The connector box adopts sealing ring and silicone seal, simple operation can be repeatedly opened, easy to use and maintain.
c. The cable splice box can be grounded according to the requirements, and equipped with special tower or pole fixed installation frame.
OPGW fiber optic cable splice box specifications and model parameters.
Overall length 500mm, outer diameter 200mm, inner diameter 180mm.
Notes on use.
a. The number of cores of OPGW fiber optic cable.
b. How many in and how many out and the corresponding cable diameter.
c. Divided into two kinds of pole and tower, such as pole, you need to provide the diameter of the pole.
OPGW fiber optic cable tensioning clip introduction
Used for cornering, splicing, and terminal connection. Spiral aluminum-clad steel wire has strong tensile strength, no concentrated stress, and plays a protective and auxiliary vibration damping role for fiber optic cable. The whole set of fiber optic cable tensioning fixture includes: tensioning outer layer pre-stranded wire, inner layer pre-stranded wire, matching connection fixture. Clamp grip is not less than 95% of the rated tensile strength of fiber optic cable easy and fast installation, reducing construction costs.
OPGW cable overhang clamps
The combination of inner and outer spiral pre-stranded wire can well protect the fiber optic cable without concentrated stress and avoid bending stress, which can play the role of protection and auxiliary vibration damping for fiber optic cable. The whole set of overhanging wire clamps include: inner and outer pre-stranded wire, suspension head and supporting connection fittings. Clamp grip is greater than the rated tensile strength of fiber optic cable 10%-20%, easy to install.
Double overhanging clamps
Use: OPGW pre-stranded wire double overhang clamps also known as double pivot point overhang clamps, it has all the properties of the general single overhang clamps, but also can be used for 800 ~ 1300 meters across rivers, canyons and other long-distance overhead lines (transmission lines or overhead fiber optic cable) and the angle of 30 ° ~ 60 ° on the tower.
Features: fiber optic cable by the double pivot point support fixed and protected, thus ensuring the long span, large corner environment of the fiber optic cable (wire) operation is safe and reliable.
Grounding wire use
OPGW fiber optic cable grounding wire is mainly used for the safety grounding of composite ground wire (OPGW) fiber optic cable or overhead ground wire to improve the reliability of the grounding system.
