Installation method of OPGW optical cable

OPGW cables are installed using a tension pay-off method on top of power line towers, with careful preparation, precise stringing, and specialized equipment to ensure mechanical and optical integrity.

Preparation and Planning

Before installation, a detailed engineering plan is essential. This includes reviewing design drawings, determining cable lengths, pre-reserved splice locations, and tower positions. The plan should account for environmental factors such as wind, ice, temperature variations, and lightning risks. Teams must inspect the site, verify tower stability, and ensure all tools and personnel are ready for the operation .

Equipment and Tools

Key equipment for OPGW installation includes tension machines, traction machines, pay-off machines, pulleys, anti-torsion devices, pre-stranding wires, cable grippers, theodolites, sag boards, and communication devices for coordination. Proper handling tools for cable drums are also required to prevent damage during transport and storage .

Cable Stringing and Tensioning

The tension pay-off method is commonly used. The cable is pulled from the drum and strung along the towers while maintaining appropriate tension to prevent sagging or abrasion. Anti-twisting devices and swivels are used to avoid fiber damage. The minimum bending radius of the optical fibers must be observed at all times to maintain optical performance .

Splicing and Jointing

Splice locations are determined based on maximum cable length and tower accessibility. Splicing is performed in designated areas, ensuring minimal optical loss. Proper alignment and protection of splices are critical for long-term reliability .

Testing and Certification

After installation, the OPGW system undergoes verification of optical transmission characteristics, mechanical integrity, and final certification. This includes checking for splice loss, continuity, and overall system performance before commissioning .

Standards and Guidelines

Installation should comply with relevant standards such as IEEE 1138, IEEE 524, and ITU-T L.151, which provide guidance on handling, stringing, tensioning, and splicing of OPGW cables to ensure safety and performance . By following these steps—careful planning, proper equipment use, controlled stringing, precise splicing, and thorough testing—OPGW cables can be installed efficiently while maintaining both electrical grounding and optical communication functionality.