AlumaCore Optical Ground Wire (OPGW)

AFL AlumaCore OPGW (Optical Ground Wire) is preferred for its central aluminum pipe and color-coded fiber optic buffer tubes which simplify the splicing process while providing optimum fiber protection as well as long term product reliability.

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Optical Ground Wire (OPGW) is a dual functioning cable.  It is designed to replace traditional static / shield / earth wires on overhead transmission lines with the added benefit of containing optical fibers which can be used for telecommunications purposes. OPGW must be capable of withstanding the mechanical stresses applied to overhead cables by environmental factors such as wind and ice. OPGW must also be capable of handling electrical faults on the transmission line by providing a path to ground without damaging the sensitive optical fibers inside the cable.

AFL has been manufacturing Optical Ground Wire since when AlumaCore OPGW was our only product.  It remains a top seller and a preferred design by many utilities because of its reputation for reliable service and survivability even in the harshest of conditions. This product has been successfully deployed worldwide in climates ranging from the Siberian Tundra to the rainforests of Brazil. The The durable optical sub-units come in a tight structure or loose tube configuration. Tight structure is the absolute most rugged option with the gel-filled loose buffer tubes running a close second.  AFL will work with you on your particular application to determine which option is best for you given your fiber count, climatic conditions, and other considerations.

The OPGW cable design is constructed of a fiber optic core (with multiple sub-units depending on the fiber count) encased in a hermetically sealed hardened aluminum pipe with a covering of one or more layers of steel and/or alloy wires. Installation is very similar to the process used to install conductors, although care must be taken to use the proper sheave or pulley sizes so as not to cause damage or crush the cable. After installation, when the cable is ready to be spliced, the wires are cut away exposing the central aluminum pipe which can easily be ring-cut with a pipe cutting tool. The color-coded sub-units are preferred by most users because they make splice box preparation very simple.

Additionally, AlumaCore OPGW is the ideal solution for those customers looking to isolate or sectionalize their OPGW in an effort to minimize line losses. Ask us more about this unique application for more details.

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Optical Power Ground Wire (OPGW) can not only transmit communication and transmission line maintenance information within the power system, but also serve as a high-frequency channel, telecontrol signal and communication channel for power system relay protection.

The role of OPGW cable

Optical Power Ground Wire (OPGW): It can not only transmit communication and transmission line maintenance information within the power system, but also serve as a high-frequency channel, telecontrol signal and communication channel for power system relay protection. The line acts as lightning protection. It can also play an important role in the realization of integrated service digital communication network for newly built ultra-high voltage long-distance transmission lines.

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Scope of application of OPGW fiber optic cable:

OPGW optical cables are mainly used on 500kV, 220kV, 110kV voltage level lines, and are mostly used on new lines due to line power outages, safety and other factors. OPGW light is suitable for lines with high voltage exceeding 110kV, and the span is large (generally more than 250m)

Features and advantages of OPGW cable:

1. It is easy to maintain, easy to solve the problem of line crossing, and its mechanical characteristics can meet the large crossing of the line;

2. The outer layer of Optical Power Ground Wire is metal armor, which has no effect on high voltage electrical corrosion and degradation;

3. OPGW must be powered off during construction, and the power outage loss is relatively large, so OPGW should be used in new high-voltage lines above 110kV;

4. In the performance indicators of OPGW, the greater the short-circuit current, the more armored conductors are required, and the tensile strength is correspondingly reduced. In the case of a certain tensile strength, to increase the short-circuit current capacity, only increase the metal Cross-sectional area, resulting in an increase in cable diameter and cable weight, which poses a safety issue to the strength of the line tower. .

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