Optical current sensors are advancing the modernization of the power grid because of the reduced costs, environmental savings, safety, reliability, and measurement fidelity improvements. The measurement range requirements are from 1 mA to more than 150 kA with frequency response extending from DC to 20 kHz and beyond. The accuracies required are often 0.1% over a temperature range from -40 ºC to +60 ºC. Several leading edge applications of the optical current sensor are presented, along with a discussion of some developing power system architectures that fully capture the advantages of this new technology. The main challenges to face are identified.
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