Measurement of leakage current and tension based on fiber Bragg grating

The measurement of the leakage current and tower tension of transmission lines using fiber Bragg grating is proposed and demonstrated in this paper. The resonant frequency of the proposed leakage current sensor is about 100 Hz, the system sensitivity is about 1.3 nm/A and can measure the 50 Hz and 150 Hz frequency components of the leakage current accurately. However, it cannot measure the leakage current perfectly due to the complex frequency characteristics of leakage current. The proposed tension sensor has a system sensitivity of 0.054 nm/kN and exhibits good stability, linearity, and recovery.