Fiber Optic Current Meter for IIoT in Power Grid
The article is focused on the fiber optic current meter with FPGA-based data processing. The sensor element operation is based on the Faraday effect which occurs in the Spun optical fiber twisted around electric wire. The demodulation method used to process the sensor signal is the joint measuring of the first and second harmonics of the modulation signal and the processing of their ratio. It is widely known for fiber optic gyroscopes and traditionally is performed in the analog form, fully or partially. This leads to errors related to instability of the analog elements, limited operating range of the device etc. We managed to combine the optical sensor circuit with NI technologies to develop and implement digital data processing algorithms, exclude sources of errors from the optical device circuit. We used a scalable NI RIO architecture, LabVIEW FPGA and LabVIEW Real-Time to implement every step in optical sensing of electric current: modulation forming, response measuring, inline processing and analog/IEC 61850 output providing, comparing performance of high-end and low-cost RIO devices.
KeywordsFiber optic current meter Faraday effect Fiber optic sensor Spun fiber
The work was done under financial support of Ministry of Education and Science of the Russian Federation in terms of FTP “Research and development on priority trends of Russian scientific-technological complex evolvement in 2014–2020 years” (agreement # 14.578.21.0211, agreement unique identifier RFMEFI57816X0211).
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