Monitoring in high-voltage environments, such as substations and power distribution or transmission networks, is used to allow the optimal operation of the system. In this sense, aspects such as quality of energy, planning, safety, and the reduction of network unavailability periods have been considered.
Optical fibers have been applied in this regard not only as a way to provide insulation between the high voltage and ground environments but also as the sensing element itself. Specifically, optical fibers have some advantages such as ease of installation and immunity to electromagnetic noise. This chapter discusses the primary applications of optical fibers in power systems and Bragg gratings in power-system monitoring.