Abstract
Instrument Optical Voltage Transformers (OVTs) have been presented by the electric power industry as an alternative to the conventional iron and copper inductive instrument transformers from the last years. OVTs based on fiber Bragg gratings and piezoelectric (PZT) crystals present two well know limitations: maximum voltage that can be applied on the PZT due to their limited electric field and the cross-sensitivity of the FBG on temperature that influence measurement accuracy. This paper presents an FBG-PZT based OVT with a novel thermally compensated method, capable to measure and monitor distribution voltages of 13.8 kV class. The presented results show that the developed system satisfies the 0.2 Accuracy Class of IEC standards, meaning a 0.2% accuracy.
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