Line fault discrimination method and device based on grounding line selection zero sequence power

The invention discloses a line fault discrimination method and device based on a grounding line selection zero sequence power direction, and the method comprises the steps: obtaining a zero-sequence voltage and a zero-sequence current of a grounding line selection system, judging whether the correlation coefficient of the high-pass filtering quantity of the zero-sequence current and the high-pass filtering quantity after the differential of the zero-sequence voltage is smaller than-0.45, if yes, judging that the zero-sequence power direction is satisfied, and the corresponding line is a fault line. The method can avoid the problem that the fundamental wave quantity is compensated after the arc suppression coil is compensated, and is suitable for a neutral point ungrounded system and a neutral point grounded system through the arc suppression coil. 一种基于接地选线零序功率方向的线路故障判别方法和装置，通过获取接地选线系统的零序电压和零序电流，判断零序电流的高通滤波量与零序电压微分后高通滤波量的相关系数是否小于-0.45，若是则判零序功率方向满足，对应线路为故障线路。该方法可以避免消弧线圈补偿后基波量被补偿掉的问题，适用于中性点不接地系统和中性点经消弧线圈接地系统。