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

Area of Science:

• Electrical Engineering
• Optical Sensing
• Metrology

Background:

• All-fiber optical current transformers (FOCTs) are susceptible to environmental interference.
• Vibrations and temperature variations can compromise the accuracy of FOCT transmission lines.

Purpose of the Study:

• To develop and evaluate a differential high stability optical current transformer (SFOCT).
• To assess the SFOCT's performance under vibration and temperature stress.

Main Methods:

• Simulation and analysis of the SFOCT design.
• Practical evaluation on a custom experimental platform with vibration and temperature cycling tests.

Main Results:

• Under vibration (250 Hz, 50 µm and 99.5 µm), average ratio errors were 0.153% and 0.165%.
• Within -10°C to 60°C, SFOCT ratio error remained within 0.1%.

Conclusions:

• The SFOCT meets the international 0.2S accuracy standard.
• The SFOCT exhibits robust resistance to external vibrations and temperature changes.
• This technology enhances the stability and reliability of optical current transformers.