中文摘要：

矿山高压电网单相接地故障中零序电流的衰减直流分量对选线的速度与准确度均有很大影响。为此，在深入研究单相接地低频暂态过程的基础上，结合最小二乘矩阵束算法提出了融合衰减直流分量与有功分量的零序电流低频暂态综合幅值判据。该判据不仅可在一定程度上降低衰减直流分量对选线保护动作速度的影响，而且能显著扩大故障与非故障线路判据特征量之间的差别，有效提升选线的准确度。大量基于PSCAD/EMTDC的典型故障实例仿真验证了该判据的正确性。

英文摘要：

As for coalmine high voltage distribution network, the decaying DC component of zero-sequence current during the single-phase earth fault obviously influences both velocity and accuracy of fault line selection. For this reason, on the basis of researching low-frequency transient process during single-phase earth fault in-depth, combining with total-least-squares matrix pencil algorithm a zero-sequence current low-frequency transient synthetic amplitude criterion, which integrates decaying DC component with active component, is proposed. The proposed criterion not only can reduce the influence of decaying DC component on the action velocity of fault line selection protection, but also can obviously enlarge the difference of criterion characteristic quantities between fault and non-fault feeders, thus the accuracy of fault line selection can be effectively improved. The correctness of the proposed criterion is validated by large amount of PSCAD/EMTDC based simulation of typical fault cases.