A Single Phase to Ground Fault Location Method for Overhead Lines Based on Dual-Axis Magnetic Field Trajectory
To address difficulties in the section location of distribution networks,this paper explores the distribution of magnetic field under the overhead line and its relationship with three-phase current and proposes a non-contact fault location method based on magnetic field.First,the sine function of magnetic field on x-axis and y-axis is fitted by the least square method.Second,the characteristic quantity expression of the magnetic field trajectory structure is obtained by corresponding the synthesized Lissajous figure with the ellipse formula.Finally,the difference of the characteristic quantity between the upstream and downstream of the fault point is analyzed to locate the fault section.Compared with other location methods based on electrical quantity,this method can get more line operation state information because of the advantage of low-cost magnetic resistance sensors,and it is more suitable for the fault location of the real distribution of complex topology.Through an analysis of the simulation model built in PSCAD/EMTDC,the adaptability of this method under different working conditions is verified.
magnetic field measurementdistribution networkfault locationLissajous-Figure
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