Secure | Scalable | Smart
FORM

fiber-optics for rating & measurement is a dynamic line rating (DLR) technology that leverages the existing fiber-optic infrastructure of overhead transmission lines to provide hyper-localized line ratings with minimal operational burden.
Because the OPGW is subject to the same weather conditions as the conductor, there is a strong correlation between the measured OPGW temperature and the conductor temperature.

The OPGW temperature can be measured using Distributed Temperature Sensing (DTS), a commonly used technology in monitoring gas pipelines and underground electric cables. What's special about DTS is that it can generate a continuous temperature profile along the entire line by using Optical Time Domain Reflectometry (OTDR). By measuring the time it takes backscattered light to return to the DTS interrogator, the position of the temperature reading can be precisely identified – similar to the operating principle of radar. 

Optical Ground Wire (OPGW)

  • Dual purpose: OPGW used as DLR sensor and for transmitting data
  • Compatibility: FORM works with standard telecom fibers found in OPGWs

Distributed temperature sensing (DTS)

  • Secure & easy installation: All equipment housed in substation - no helicopters, no drones, no outages
  • Unparalleled resolution: Sub-meter readings every 5 minutes along the entire line

Software & Analytics

  • Physics-derived equations: Ratings are based on industry standards (IEEE 738 and CIGRÉ 601)
  • High-quality software: Easy-to-use interactive dashboard puts all of the relevant information at your fingertips

FORM smart

FORM smart combines the OPGW temperature measurements with wind data supplied by external sources. These sources include

  • Commercial weather services (e.g., ECMWF)
  • Machine learning models
  • Assuming static values based on industry standards (e.g., 0.6 m/s at 45°)

FORM plus

For those looking for the highest degree of visibility, FORM plus utilizes specialized fiber-optic anemometers (FOAs) that integrate with the OPGW to provide localized wind measurements in real-time. These FOAs operate 100% passively, meaning they do not require any external power source and can be installed every several km directly on the transmission towers without de-energizing the line.

Modular solutions based on your needs

Whether you're looking to comply with future DLR rulemakings (e.g., FERC AD22-5-000), reduce congestion costs, or avoid expensive investments in new infrastructure, FORM can help you achieve these goals with its proven and patent-pending technology. 

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