FOSA Installation Considerations
Distributed fiber optic sensing (DFOS) techniques such as Distributed Temperature Sensing (DTS), Distributed Acoustic Sensing (DAS) and Distributed Strain Sensing (DSS) are powerful tools for monitoring of long, linear assets. Consequently, these approaches fit perfectly with specific requirements of the power industry, where they fulfill objectives in various areas:
- Monitoring the temperature of land and submarine power cables, overhead lines, generators, transformers and other assets
- Monitoring the sag of overhead lines
- Localizing faults in power cables
- Detecting ship movements and anchor events in proximity to submarine cables
- Detecting insufficient burial and unsupported spans of submarine cables
- Detecting activity along the cable route (work crews, trespassers, cable tampering)
- Monitoring mechanical load (tension, bending, torsion) during production, loading, transport, installation and operation of power cables
In each of these applications, distributed fiber optic sensing offers clear benefits in the ability to cover a wide area from a central monitoring point, often by taking advantage of spare fibers in existing buried cables and overhead lines.
Optimum performance for sensing objectives is dependent on cable type, installation method, cable position and the environmental conditions of the site. This applies to existing cables and those installed specifically for distributed fiber optic sensing.
This document provides guidance on best practice for the selection and installation of cables for fiber optic sensing in the power utilities domain. The most prevalent sensing technology for power utility applications is DTS which monitors temperatures related to the past and present electric current loads of power cables.