The optical cable in a power collection line is typically installed either attached to the overhead power conductors or buried alongside the collection cables underground, depending on the system design.

Overhead Installation

For high-voltage transmission lines, optical cables are often attached to the host conductor using systems like OPAC (Optical Power Attached Cable) or OPGW (Optical Fiber Composite Overhead Ground Wire) . These cables run along the top of the power line towers:

• OPAC cables are wrapped, lashed, or clipped to the existing power conductors, often using specialized equipment that moves along the line from tower to tower .
• OPGW cables integrate optical fibers within the overhead ground wire, serving both as a ground wire and a communication link .
• ADSS cables (All Dielectric Self-Supporting) are installed alongside power lines without metal components, providing high insulation and tension resistance . These overhead cables allow real-time data transfer and control for substations and collection circuits, often spanning long distances and high towers .

Underground Installation

In some collection line systems, the optical cable is installed underground alongside the power collection cables. During trenching for the three parallel power cables, a fiber optic cable is laid in the same trench, typically below the roadway or field surface . Markers and GPS coordinates are used to document the cable location, and the trench is backfilled after installation to restore the topsoil . This method is common for medium- or low-voltage collection lines where overhead installation is impractical.

Summary

• High-voltage transmission lines: Optical cable is attached overhead to conductors (OPAC, OPGW, ADSS).
• Medium/low-voltage collection lines: Optical cable may be buried underground alongside the power cables.
• Purpose: Provides communication, control, and monitoring for the power collection system. This dual approach ensures that the optical cable is secure, protected, and integrated with the power collection infrastructure, whether overhead or underground.