《Sagnac型光纤电流互感器数据同步的研究》.pdfVIP

40 8 Vol.40 No.8 2012 4 16 Power System Protection and Control Apr. 16, 2012 Study of data synchronization of Sagnac fiber optic current transformer MA Chao, LI Li-jing, LI Chuan-sheng (School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China) Abstract: Data synchronization method based on Sagnac fiber optic current transformer (S-FOCT) is discussed. According to the digital closed-loop signal detecting principle of S-FOCT, data synchronization method based on interpolation is ascertained. In order to improve the measuring precision and real-time performance, data synchronization technology based on linear interpolation with high sampling frequency is presented, and the work of simulation and error analysis are finished. The simulation result shows that linear interpolation method with the sampling frequency of 200 points per period can meet the requirement of the data synchronization of S-FOCT. And static amplitude error can reach less than 0.014% , phase error less than 0.12 , transient amplitude error less than 0.2% , and phase error less than 1.2 , which are much less than the limited values of error regulated in IEC60044-8 standard. Therefore, this algorithm has no influence on the precision of S-FOCT. Key wordsSagnac fiber optic current transformer data synchronization linear interpolation error analysis amplitude error phase error TM732 A 1674-3415(2012)0