Abstract
In view of the characteristics of the small amplitude of a current signal, an all-optical fibre small-current sensor for partial discharge is devised. A novel type of sensor head with electric winding light is proposed. A complete optical model of the optical fibre current sensor is developed under the effect of polarization error factors. In addition, the effect of polarization error factors on the optical fibre sensing system is simulated. The simulation results show that as the extinction ratio increases, the output relative error of the optical fibre small-current sensor decreases. The effect of the fast and slow axis misalignment errors of a polarizing beam splitter is similar to the effect of the alignment angle error of an optical fibre polarizer. It is observed that the relative error curve follows a sine function. Meanwhile, the output relative error increases first and then oscillates with an increase in the linear birefringence. We conclude that the linear birefringence of the sensing optical fibre is the main error source for the measurement accuracy of the sensing system. Finally, an experimental system for the optical fibre small-current sensor is implemented. The experimental results show that the effect of linear birefringence on the fibre current sensing system can be suppressed by introducing a large amount of circular birefringence into the sensing optical fibre. The theoretical mechanism of these errors is analysed, which can be applied to implement corresponding measures to reduce the effect of error factors on the sensing system and further improve the measurement accuracy of the optical fibre small-current sensor.
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Acknowledgements
This work was supported by the Natural Science Research Project of Jiangsu Higher Education Institutions (18KJB460003), the Natural Science Foundation of Jiangsu Province (BK20180189), the National Natural Science Foundation of China(61701169),the Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology (2017JSSPD02), 2018 Scientific research platform of Changzhou College of Information Technology (KYPT201801G) and Chang-zhou Key Laboratory of high technology (CM20183004). The authors would like to thank the anonymous reviewers for their helpful comments which have improved the quality of the paper.
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Xin, G., Zhu, J., Luo, C. et al. Polarization Error Analysis of an All-Optical Fibre Small Current Sensor for Partial Discharge. J. Electr. Eng. Technol. 15, 2199–2210 (2020). https://doi.org/10.1007/s42835-020-00474-x
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DOI: https://doi.org/10.1007/s42835-020-00474-x