Installation Process of Power Communication Optical Cables

Power communication optical cables, such as OPGW, OPAC, and ADSS, are installed on transmission lines to provide both communication and grounding functions, requiring careful planning, specialized equipment, and adherence to engineering standards.

Types of Optical Cables for Power Lines

• OPGW (Optical Ground Wire): Combines grounding and fiber optic communication in a single cable, installed above high-voltage conductors to protect against lightning and provide high-speed data transmission .
• OPAC (Optical Power Attached Cable): A dielectric fiber optic cable attached to existing conductors, often using wrapping methods like Sky-Wrap, suitable for expanding communication capacity without adding significant weight .
• ADSS (All-Dielectric Self-Supporting): Non-metallic fiber optic cable capable of spanning long distances without support from metallic conductors, safe for installation near energized lines .

Installation Preparation

1. Engineering Planning: Develop a detailed plan based on line structure, environmental conditions, and cable type. Consider wind, ice, temperature variations, and lightning risks .
2. Design Drawings: The design department provides drawings to the engineering team, including cable route, length, splice locations, and substation connections .
3. Equipment and Tools: Essential tools include tension machines, pay-off machines, pulleys, torsion releasers, sag boards, theodolites, and communication devices for coordination .

Installation Methods

• Tension Pay-Off Method: Maintains proper tension to keep the cable suspended, preventing ground abrasion and reducing physical labor .
• Attachment Techniques:
  • OPGW: Mounted on top of transmission towers, often in a central stainless steel tube or aluminum pipe for protection and conductivity .
  • OPAC/Sky-Wrap: Helically wrapped around existing conductors using specialized machines, with extra fiber length to prevent stress .
  • ADSS: Suspended between towers without metallic support, designed to withstand pulling tension and environmental stress .

Environmental and Mechanical Considerations

• Account for wind vibration, ice loading, hurricanes, and temperature fluctuations to prevent mechanical failure .
• Ensure proper sag and tension to avoid excessive stress on fibers and support structures .
• Use protective cable jackets to resist abrasion, UV exposure, and ice accumulation .

Splicing and Testing

• Prepare cables for fusion splicing using appropriate closures and follow manufacturer guidelines for fiber handling .
• Conduct on-site testing for mechanical integrity, transmission performance, and splice loss before final acceptance .

Summary

Installing power communication optical cables requires careful planning, specialized equipment, and adherence to engineering standards. OPGW provides dual grounding and communication functions, OPAC allows attachment to existing conductors, and ADSS supports long spans without metallic support. Proper tensioning, environmental considerations, and splicing procedures are critical to ensure reliable operation and longevity of the communication system .