OPGW optical cable (also known as optical fiber composite overhead ground wire) places optical fiber in the ground wire of overhead high-voltage transmission lines to form an optical fiber communication network on the transmission line. This structural form has the dual functions of ground wire and communication, and is generally called OPGW optical cable. Since optical fiber has the characteristics of anti-electromagnetic interference and light weight, it can be installed on the top of the transmission line tower without considering the excellent suspension position and electromagnetic corrosion. Therefore, OPGW has significant features such as high reliability, superior mechanical properties, and low cost. This technology is particularly suitable and economical for new installations or replacement of existing ground wires. OPPC (Opticalphase Conductor, OPPC for short) is a new type of optical cable dedicated to power communication systems. It is an optical cable that combines optical fiber units in conductors with a traditional phase structure. The distribution network system avoids conflicts with the outside world in terms of frequency resources, routing coordination, electromagnetic compatibility, etc., allowing it to have dual functions of power transmission and communication.
Although the structure of OPPC optical cable is similar to OPGW optical cable, it is very different in design. First, due to the role of phase wires, and considering the impact of long-term operating temperature on fiber transmission performance and fiber life, OPPC optical cables can carry power for a long time; secondly, the mechanical and electrical properties of OPPC optical cables should be consistent with adjacent conductors, such as DC resistance Or impedance and adjacent conductor The wires are close to ensure that the remote voltage changes maintain three-phase balance; thirdly, OPPC optical cable is installed in a high-voltage system, and its installation hardware and accessories (such as tension clamps, suspension clamps and terminal junction boxes) need to be insulated, and the clamps can Use appropriately insulated tension strings or insulated suspension strings. Photoelectric insulation/separation and connection require special technology and have relatively high construction requirements.
