Abstract
The paper aims at the phenomenon of the magnetic field between phases of magneto-optical current transducer, studies the magnetic field interference distribution characteristics and proposes the orthogonal optical path optimization scheme to improve the ability of the magneto-optic current transducer to resist the external magnetic field interference. The mathematical model of magnetic field interference degree of magneto-optic current transducer is established, and the distribution characteristics of magnetic field interference degree of magneto-optical current transducer under the effect of interfering current are studied. The research shows that the position of interfering current has a specific law on the magnetic field interference degree of the magneto-optic current transducer, and the interfering current at a specific position has no interference effect on magneto-optic current transducer. It is pointed out that magnetic field interference degree is larger when the magneto-optic current transducer is arranged in the conventional way, and the error caused by the magnetic field interference between phases cannot be ignored. The orthogonal optical path optimization scheme of magneto-optic current transducer is put forward, which can improve the anti-interference ability from external magnetic field of magneto-optic current transducer without changing its body structure and installation condition. The experimental results show that the relative error of magneto-optic current transducer caused by the interfering current is less than 0. 1% when the orthogonal optical path optimization scheme is adopted, which proves the correctness and practicability of the orthogonal optical path optimization scheme.
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