A Sensitivity-enhanced Fiber Grating Current Sensor Based on Giant Magnetostrictive Material for Large-Current...

Area of Science:

• Electrical Engineering
• Materials Science
• Sensor Technology

Background:

• Measuring large currents on high voltage gridlines with high sensitivity and uninterrupted online capability remains a significant challenge in the power industry.
• Traditional fiber grating current sensors utilizing giant magnetostrictive materials offer online measurement but suffer from relatively low sensitivity.

Purpose of the Study:

• To develop a sensitivity-enhanced fiber grating current sensor for high-sensitivity, uninterrupted online measurement of large currents.
• To address the limitations of existing sensors in the modern power industry.

Main Methods:

• A sensitivity-enhanced fiber grating current sensor was developed by applying pressure to the giant magnetostrictive material.
• The sensor's performance was evaluated by sampling power frequency sinusoidal alternating current signals with amplitudes of 107 A, 157 A, and 262 A.

Main Results:

• The sensitivity-enhanced current sensor demonstrated significant sensitivity improvements compared to traditional sensors.
• Sensitivity enhancements were 268.96% for 107 A, 135.72% for 157 A, and 71.57% for 262 A currents.
• The enhanced sensor achieves high sensitivity and uninterrupted online measurement of large currents.

Conclusions:

• The developed sensitivity-enhanced fiber grating current sensor provides a simple and low-cost solution to the long-standing issue of high-sensitivity, uninterrupted online measurement of large currents in the power industry.
• This innovation has the potential to significantly improve grid monitoring and management.