Overhead 24 core aluminum clad steel OPGW power optical cable OPGW-24B1-150 OPPC optical cable

Description :

　　Overhead 24 core aluminum clad steel OPGW power optical cable OPGW-24B1-150 OPPC optical cable

　　 OPGW optical cable, also known as Optical Fiber Composite Overhead Ground Wire.

　　 OPGW optical cable places optical fibers in the ground wire of overhead high-voltage transmission lines to form a fiber optic communication network on the transmission lines. This structural form combines the dual functions of ground wire and communication, and is generally referred to as OPGW optical cable.

　　Due to its anti electromagnetic interference and light weight, optical fibers can be installed on the top of transmission line towers without considering issues such as mounting position and electromagnetic corrosion. Therefore, OPGW has significant characteristics such as high reliability, superior mechanical performance, and low cost. This technology is particularly suitable and economical for new installation or replacement of existing grounding wires.

　　OPGW fiber optic cable utilizes the difference in refractive index between the core and cladding materials to transmit light energy through optical fibers, which has become a major revolution in communication history. Fiber optic cables are lightweight and compact, and have been adopted by power systems to transmit dispatch calls, remote signals, relay protection, television images, and other information between substations and central dispatch centers. In order to improve the stability and reliability of fiber optic cables, foreign countries have developed a structure that combines fiber optic cables with transmission lines, overhead ground wires, and power cables. OPGW optical cable is more reliable, stable, and sturdy due to the metal wire wrapping. As the overhead ground wire and optical cable are combined into one, it not only shortens the construction period but also saves construction costs compared to using other types of optical cables. In addition, if OPGW made of aluminum clad steel wire or aluminum alloy wire is used, it is equivalent to setting up a good conductor overhead ground wire, which can achieve various benefits such as reducing the potential supply current of transmission lines, reducing power frequency overvoltage, improving the interference and dangerous impact of power lines on communication lines, etc.

　　In order to meet the needs of the market, the technical indicators of optical fibers are constantly improving, and various new types of optical fibers are emerging. At the same time, major companies are accelerating the development of new varieties.

　　(1) New high-capacity long-distance optical fiber for long-distance communication

　　Mainly some new G.655 optical fibers with large effective area and low dispersion maintenance, with extremely low PMD values, can easily upgrade the capacity of existing transmission systems to 10-40Gbit/s, and facilitate the use of distributed Raman effect amplification on optical fibers, greatly extending the transmission distance of optical signals.

　　Characteristics of OPGW optical cable

　　1. Issues to be noted when choosing to use OPGW optical cable

　　2. 1. Reasonably choose the outer sheath of the optical fiber. There are three types of fiber optic outer sheath pipes: plastic pipes made of organic synthetic materials, aluminum pipes, and steel pipes. Plastic pipes have low cost. To meet the protection requirements of plastic pipe sleeves against ultraviolet radiation, it is necessary to use fewer layers of armor. The plastic pipe OPGW has a short-term temperature rise capacity of less than 180 ℃ caused by short-circuit current; Aluminum tubes have a lower cost. Due to the low impedance of aluminum, it can increase the ability of OPGW armor layer to withstand short-circuit current. The ability of aluminum tube OPGW to withstand short-term temperature rise caused by short-circuit current is less than 300 ℃; Stainless steel pipes are expensive. However, due to the thin wall of steel pipes, the number of optical fiber cores installed in stainless steel pipes under the same cross-sectional conditions is higher than that in plastic pipes and aluminum pipes. Therefore, the unit cost of optical fiber cores is not high under multi-core conditions. The ability of steel pipe OPGW to withstand short-term temperature rise can reach 450 ℃. Users can choose the optical fiber outer sheath reasonably according to the specific situation of the project.

　　3. When replacing the old line ground wire with OPGW optical cable, it is necessary to choose an OPGW with mechanical and electrical characteristics equivalent to the original overhead ground wire. The outer diameter, unit length weight, ultimate tensile strength, elastic modulus, coefficient of linear expansion, short-circuit current and other parameters of OPGW are close to the existing ground wire parameters. This not only avoids changing the existing tower head and reduces the amount of renovation work, but also ensures the safe distance between OPGW and the existing phase conductor, ensuring the safe operation of the power system.

　　4. The installation and construction of OPGW optical cable is similar to the installation of ADSS optical cable, and the hardware used is almost the same, except for the different hanging points. The OPGW optical cable needs to be installed at the position of the overhead ground wire. The intermediate joint position of the optical cable line must be placed on the tension tower through a distribution plate.

　　1. The loose tube material itself has good water resistance and high strength

　　2. The tube is filled with special grease to provide critical protection for the optical fiber

　　3. Specially designed tight fiber optic cable structure effectively prevents sleeve retraction

　　4. PE sheath has excellent resistance to ultraviolet radiation

　　5. Adopt the following measures to improve the waterproof performance of optical cables:

　　 Overhead 24 core aluminum clad steel OPGW power optical cable OPGW-24B1-150 OPPC optical cable

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