Polarization Error Analysis of an All-Optical Fibre Small Current Sensor for Partial Discharge
- PDF / 2,453,866 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 56 Downloads / 154 Views
ORIGINAL ARTICLE
Polarization Error Analysis of an All‑Optical Fibre Small Current Sensor for Partial Discharge Gaifang Xin1,2 · Jun Zhu1 · Chengming Luo3 · Jing Tang1 · Wei Li4 · Yuxin Cao2 · Haiyan Xu2 Received: 6 January 2020 / Revised: 5 March 2020 / Accepted: 18 June 2020 © The Korean Institute of Electrical Engineers 2020
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. Keywords Small current · Optical fibre sensing · Assembled magnetic effect · Jones matrix
1 Introduction An accurate measurement of current is a precondition for power measurements, relay protection, system monitoring and diagnosis, and power system analysis [1], which is of great significance for the safety and economic operation of an electric power system. A traditional current sensor has characteristics such as magnetic saturation, ferromagnetic resonance, a narrow frequency band, a small dynamic range, * Gaifang Xin [email protected] 1
Department of Intelligent Equipment, Changzhou College of Information Technology, Changzhou 213164, China
2
College of Internet of Things Engineering, Hohai University, Changzhou 213022, China
3
School of Electronic and Information, Jiangsu University of Science and Technology, Zhenjiang 212003, China
4
School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
flammability and explosibility [2, 3]. With the development of the modern electric power
Data Loading...
