Optical Fibre Composite Overhead Ground Wire (Uni-tube)

Description

Optical fibre composite overhead ground wire (OPGW) is an overhead ground wire containing optical fibre. It has multiple functions such as overhead ground wire and optical communication. It is mainly used for communication lines of 110KV, 220KV, 500KV, 750KV and new overhead high-voltage transmission system. It can also be used to replace the existing ground lines of the old overhead high voltage transmission system, add the optical communication line, transmit short time current and provide anti lightning protection. Other structures can be customized on request.

• Stainless steel tubes filled with hydrophobic gel provide the protection and support of the optical fibres
• Good tensile performance
• Small diameter, light weight, low additional load to the tower
• Appropriate fibre excess length of optical unit easliy to make

Applications:
OPGW cable is suited for installation on transmission lines with the double function of a ground wire (designed to replace traditional static or shield wires) and a communication wire. OPGW conducts short circuit current and provide lightning resistance as it shields” conductors, while providing a telecommunications path for internal as well as third party communications. OPGW must be capable of withstanding the mechanical and environmental stresses inflicted on overhead cables (such those caused by wind or ice). OPGW must also be capable of handling electrical faults on the transmission line by providing a path to ground yet preventing damage to the delicate optical fibers inside the cable.

Construction

OPGW cable has two constructions

Central loose tube type---The fibers are placed loosely in a sealed and water resistant central, aluminum tube filled with water blocking gel. This

tube provides protection to the fiber during installation and operation under severe environmental conditions. The stainless steel tube may also

be aluminum-clad steel depending on the engineering requirements. The stainless optical tube is located at the center of the cable protected by

single or multiple layers of aluminum clad steel, aluminum alloy wires, or steel wires. The metallic wires provide mechanical strength to withstand

severe installation and operating conditions, while achieving conductivity to control temperature rise during short circuit conditions.

Each optical fiber is clearly distinguishable utilizing a fiber identification system consisting of coloring and the number of ring marks on it. This

compact design features high mechanical strength and fault current rating with