距离保护傅里叶模型算法 使用图基滤波器 控制阻抗轨迹显示范围 在阻抗平面画出阻抗圆特性、整定阻抗直线特性和短路阻抗轨迹- Distance protection algorithm using the Fourier model-based filter control chart shows the range impedance locus in the impedance circle characteristic impedance plane plot, s