50 square millimeters of OPGW optical cable

A 50 mm² OPGW cable is a single-layer optical ground wire designed for high-voltage transmission lines, combining mechanical strength, lightning protection, and optical fiber communication.Construction and Design

A 50 mm² OPGW cable typically features a central stainless steel tube that houses and protects the optical fibers, often filled with water-blocking gel to prevent moisture ingress and provide shock absorption during installation and operation . Surrounding this central tube are aluminium-clad steel wires and aluminium alloy wires, which provide mechanical strength, electrical conductivity for grounding, and resistance to environmental stresses . The single-layer design ensures a compact structure while maintaining sufficient tensile strength for long spans.

Electrical and Mechanical Properties

• Cross-sectional area: 50 mm², suitable for rated voltages of 66 kV, 115 kV, 150 kV, 250 kV, and 275 kV .
• Mechanical strength: Designed to withstand severe installation and operational conditions, including wind, ice loading, and short-circuit currents .
• Short-circuit current capacity: The metallic layers allow the cable to safely conduct fault currents while protecting the optical fibers .
• Durability: The aluminium and steel layers provide excellent corrosion resistance and long-term reliability in outdoor environments .

Optical Fiber Features

• Fiber protection: Fibers are loosely placed in the central tube to prevent strain during installation and operation .
• Fiber count: Single-layer OPGW cables can accommodate up to 48 fibers, with clear identification using color coding and ring marks .
• Transmission performance: Designed for low attenuation and high stability, suitable for long-distance communication and smart grid applications .

Applications

• High-voltage transmission lines: Provides both grounding and lightning protection while enabling secure data transmission .
• Communication networks: Supports voice, video, and data signals for grid monitoring, substation automation, and power line protection systems .
• Replacement or new installations: Can replace existing ground wires or be installed in newly constructed lines with minimal additional load on towers .

Summary

A 50 mm² OPGW cable is a robust, dual-function cable that integrates mechanical, electrical, and optical capabilities. Its single-layer design is suitable for medium to high-voltage transmission lines, offering reliable grounding, lightning protection, and high-bandwidth communication, while ensuring long-term durability and ease of installation .