All-fiber quantum current transformer based on nitrogen-vacancy centers
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Published on: August 2, 2019
Qingtao Guo1, Chenggang Guan1, Jiaoli Gong1
1Laboratory of Optoelectronics and Sensor (OES Lab), School of Science, Hubei University of Technology, Wuhan 430068, China.
Abstract:
High-voltage substations impose stringent requirements on current measurement, demanding simultaneously high electrical insulation and stable, high-precision performance. Here we propose and experimentally validate an all-fiber quantum current transformer based on nitrogen-vacancy (NV) centers in diamond. The transformer employs four optical fibers to realize power delivery and signal transmission between the high-voltage and low-voltage sides, completely eliminating metallic electrical connections. The system achieves a magnetic sensitivity of 4.05 nT/Hz1/2, with highly linear current response (R2 = 0.998) and a measurement accuracy better than 1%. This all-fiber architecture satisfies the dual constraints of high-voltage insulation and low power consumption while preserving the metrological precision of quantum sensing, providing a viable pathway toward non-invasive precision current monitoring in next-generation smart substations.
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