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A distributed optical current transducer (DOCT) and a current measurement method are proposed to solve the problem that the straight-through optical current transducer is vulnerable to crosstalk magnetic field interference. We established a mathematical model of the magnetic interference degree of DOCT. Analyzing and summarizing the characteristics of the magnetic interference degree distribution of DOCT revealed that there are six magnetic interference zeros outside of DOCT. Then based on the background of three-phase common box current measurement in a gas-insulated substation, a current measurement method of anticrosstalk magnetic field interference is proposed, that is, adjusting the direction of DOCT to make the interference current at zero magnetic interference point, to achieve the effect of anticrosstalk magnetic field interference. The experiment shows that the measurement error of DOCT is <0.15 % , and the interference of the crosstalk magnetic field can be ignored. [ABSTRACT FROM AUTHOR]

One of the problems faced in magnetic sensors is how to evaluate their ability to anti-magnetic field interference (AMFI). External magnetic fields can easily affect the accuracy of magnetic sensor measurements. In the worst-case scenario, the measured magnetic field will be masked entirely, and the magnetic sensor will lose its measurement function. Existing research usually uses measurement errors to reflect the AMFI ability of magnetic sensors, but measurement errors can vary with changes in interference current. Therefore, measurement error cannot be used as an indicator to evaluate the ability of magnetic sensors to AMFI. This article proposes a magnetic field interference degree (MFID) analysis method in response to this issue. By establishing an MFID mathematical model, the influence of parameters such as current interference angle and distance ratio on the MFID distribution characteristics of magnetic sensors is studied. In order to guide the AMFI design of magnetic sensors, the MFID mathematical model is solved to calculate the magnetic field interference zero point (MFIZP). An optimization plan is also proposed to improve the AMFI capability of magnetic sensors. The single-axis TMR sensor is used in this article for experiments to verify the feasibility of the proposed method and optimization scheme. Analysis and experimental results indicate that the method proposed in this paper can reasonably evaluate the magnetic sensor's AMFI ability, and the optimization scheme is superior in improving the magnetic sensor's AMFI ability. [Display omitted] • An MFID analysis method has been proposed, which can reflect the AMFI ability of magnetic sensors. We have built an MFID mathematical model and explained the process of its establishment. • The influence of θ and the d Q on the AMFI ability of magnetic sensors was explored through numerical simulation, and the AMFI ability characteristics of magnetic sensors were summarized. • Based on the mathematical model of MFID, the position with the most robust AMFI ability of magnetic sensors was derived, and based on this discovery, an optimization plan was developed to improve the AMFI ability of magnetic sensors. • Design physical validation experiments and compare the experimental results with theoretical analysis, proving the feasibility of our proposed MFID analysis method and optimization scheme. [ABSTRACT FROM AUTHOR]