Highly stable all-fiber optical current transformer based on a differential dual optical path system

To address the vulnerability of all-fiber optical current transformer (FOCT) transmission lines to external vibrations and temperature variations, this study introduces a differential high stability current transformer (SFOCT). This system was subject to simulation, analysis, and practical evaluation on a custom experimental platform designed for vibration and temperature cycling tests. The findings demonstrate that when the transmission line is subjected to vibration interferences at 250 Hz with amplitudes of 50 mu m and 99.5 mu m, the average ratio errors are 0.153% and 0.165%. Additionally, within a temperature range of -10 degrees C to 60 degrees C, the ratio error of SFOCT stays within 0.1% throughout the temperature variation range. These results confirm that the SFOCT meets the international 0.2S level accuracy standard for electricians, thereby proving its robust resistance to vibration and temperature changes. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.