Abstract To deal with the difficulties of quantity transfer and on-line high current calibration for large-scale electric welding and electroplating, a prototype of reflective Sagnac fiber-optic current transformer (RS-FOCT), named fiber broadband high current measuring instrument, was developed and proposed. The prototype utilized the techniques including the linear birefringence suppression, the retarder temperature self-compensation, the closed-loop digital signal detection, and meanwhile implemented optimization design like flexible fiber sensing coil. Several key technical features were tested. The test results showed that the measurement accuracy of the developed prototype is superior to ±0.2% under the experimental condition, the scale factor errors under the changes caused by the temperature, vibration and magnetic field variation, are all less than ±0.2%. Frequency response at 1kHz is attenuated by 0.14%, and the -3dB bandwidth is wider than 10kHz. The accuracy reliability and serviceability in high current online calibration of the measuring instrument were verified. The model’s extended uncertainty of measurement error is 0.10%, the accuracy grade of the measuring instrument is in accordance with 0.2 grade.
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2020, Vol. 41 
