35kV overhead line optical cable placed on the right side

For a 35kV overhead line, the optical cable should be installed on the right side with proper corner point selection, anti-tracking protection, and adherence to safe tension and bending limits.

Cable Type and Installation

For 35kV lines, ADSS (All-Dielectric Self-Supporting) optical cables are commonly used because they are non-metallic and can be installed near live conductors without conducting electricity. The cable should be positioned on the right side of the line according to the design plan, ensuring it does not interfere with the power conductors or create flashover risks. Proper installation methods include controlled paying-off, avoiding excessive tension, and maintaining the minimum bending radius to prevent fiber damage.

Corner Point Selection

The corner point is critical to prevent cable disconnection or mechanical stress. Key guidelines include: Avoid high mountains, deep ditches, riverbanks, dams, cliff edges, steep slopes, or flood-prone areas. Place the corner on flat or gently sloped ground with easy access for construction machinery.

Ensure rational arrangement of front and rear poles to avoid excessive elevation or unnecessary poles. The corner point should be as low as possible, avoiding straight pole towers or pre-planned tensile tower locations. For mountainous routes, avoid bad geological zones and dry river ditches, and consider stable riverbanks for crossings.

Safety and Electrical Considerations

Use anti-track materials to reduce the risk of dielectric breakdown due to strong electric fields. Avoid moisture ingress, abrasion, or scratches on the cable sheath, as these can increase attenuation or cause fiber breakage. Maintain safe distances from live conductors and use insulated tools, belts, and gloves during live-line work.

Dry-band arcing and flashover can occur if the cable is too close to conductors or grounded towers, so proper spacing and anti-tracking design are essential.

Mechanical and Environmental Precautions

Ensure the cable is not subjected to heavy crush, excessive tension, or friction against poles, towers, or other objects. Seal cable ends with waterproof tape to prevent water ingress. Consider environmental factors such as humidity, wind, and ice loading, which can affect sag and tension.

Use specialized installation equipment for high-voltage spans, such as radio-controlled or battery-powered wrapping machines for safety. By following these guidelines, a 35kV overhead line optical cable can be safely installed on the right side, minimizing mechanical stress, electrical hazards, and long-term maintenance issues.