Optical cable OPGW 12 cores weight 140 kg

A 12-core OPGW cable weighing 140 kg is a lightweight, dual-function optical ground wire designed for overhead transmission lines, combining fiber optic communication with electrical grounding and lightning protection.

Construction and Materials

A 12-core OPGW cable typically consists of a central stainless steel tube containing the optical fibers, which are loosely buffered in water-blocking gel to prevent strain and moisture ingress . Surrounding this core are aluminum-clad steel (ACS) wires or a combination of ACS and aluminum alloy wires, providing mechanical strength, electrical conductivity, and fault current handling . The cable may also feature a hermetically sealed aluminum pipe for additional fiber protection . The design ensures the cable can withstand environmental stresses such as wind, ice, and temperature variations.

Optical Fibers

The 12 cores are typically single-mode fibers (ITU-T G.652.D or G.655), color-coded for easy identification and splicing . The fibers are protected against lateral pressure, twisting, and tensile stress during installation and operation. Loose tube or tight structure configurations are used depending on the required ruggedness and environmental conditions .

Mechanical and Electrical Properties

• Weight: 140 kg, suitable for aerial installation without overloading towers or poles .
• Tensile Strength: Provided by the steel and aluminum layers, allowing the cable to support its own weight over long spans.
• Electrical Function: Acts as a ground wire, conducting fault currents and providing lightning protection while safeguarding the optical fibers .
• Diameter: Small enough to minimize additional load on transmission structures, typically optimized for high-voltage lines above 35 kV .

Installation Considerations

OPGW cables are installed similarly to conventional overhead conductors, using proper sheaves and pulleys to avoid crushing or damaging the cable . Accessories such as joint boxes, clamps, and connectors are available to facilitate splicing and secure attachment to towers . The cable's lightweight design and robust construction make it suitable for both new installations and replacement of existing ground wires.

Advantages

• Combines telecommunication and grounding functions in a single cable.
• Corrosion-resistant due to stainless steel and aluminum layers.
• High reliability in harsh climates, from extreme cold to tropical conditions .
• Low theft risk due to durable construction and protective layers .
• Supports long-distance data transmission without repeaters, up to 80 km per segment . In summary, a 12-core OPGW cable weighing 140 kg is a versatile, durable, and lightweight solution for overhead transmission lines, providing both optical communication and electrical grounding while ensuring mechanical resilience and ease of installation.