单相开口剩余电流互感器假剩余电流发生机理和数值消除方法研究

Research on Mechanism and Elimination of False Residual Current in Single-phase Open Residual Current Transformer

本文中作者从导线的位置坐标和导线与气隙夹角对FRC现象进行ANSYS Electronics仿真分析,得出以下结论:1.导线穿过ORCT的位置坐标对磁场分布有很大影响,相同偏移度,不同位置坐标导线产生的FRC差2倍;2.导线与气隙相对角度变化对FRC的影响,最大相差可达5倍。本文通过实验验证了仿真的正确性。最后,将导线与气隙夹角和导线位置坐标及一次侧电流作为特征值,运用神经网络拟合FRC的函数。实现在数值层面剥离FRC的干扰,预测出真实漏电的误差在5.1%以内。

In this paper,the"FRC"phenomenon is simulated and analyzed by ANSYS Electronics from the position coordinates of conductor and the Angle between conductor and air gap:1.The wire position coordinates through the ORCT significantly influence the distribution of magnetic field,and cause maximumly twice of difference with different wire positioning.2.Maximumly five times of FRC can be generated with different angle between the wire and the air gap.The correctness of the simulation is verified by experiments.Finally,the angle between the wire and the air gap,the coordinates of the wire position and the current on the primary circuit are applied as the features,and the function of FRC is fitted by neural network.The interference of FRC is removed at the numerical level,and the prediction error of true leakage is lower than 5.1%.