A novel method to improve magnetic field immunity of a differential optical current transducer

作者：Li Shenwang^*; Zhang Guoqing; Yu Wenbin; Guo Zhizhong; Shen Yan

来源：Proceedings of the CSEE, 2013, 33(36): 157-163.

• Anti-interference
• Azimuth angles
• External magnetic field
• Magnetic crosstalk
• Optical current transducers
• Optimization scheme
• Straight light path

The anti-interference ability of differential optical current transducer (DOCT) is weak. A novel method was proposed to improve the magnetic field immunity of DOCT. The mathematical model of magnetic field immunity of DOCT was established, and the magnetic field immunity characters of DOCT arranged in different ways were researched. The research showed that the magnetic field immunities of DOCT arranged in tradition ways are small and lead to a weak anti-interference ability to external magnetic field. The research discovered that there must be four P points around DOCT on where the magnetic field immunities are infinite. Basing on it, the optimization scheme of best azimuth angle was proposed, and the method to calculate the best azimuth angles was provided. The experimental results showed that while the best azimuth angle optimization scheme was applied, the interference error induced by crosstalk was less than 0.08%, which was half of the error of conventional arrangement scheme. Experimental results demonstrate the correctness and practicality of the optimum azimuth optimization scheme.

• 出版日期2013