基于主导频带相对瞬时变化率的配网故障选线方法

为了有效地提高配网接地故障选线的准确度,提出了一种基于暂态零模电流相对瞬时变化率的故障选线方法。通过分析配网暂态电气量特点,定义了零模电流瞬时变化率参考序列和暂态选线主导频带。在主导频带内求取故障后各线路最大瞬时变化率,将其与参考序列进行比较,根据最大相对瞬时变化率实现配网故障选线。理论分析及仿真验证均表明,该方法有效地拉大了故障特征差异,具有良好的选择性和适应性。

Fault line selection method of distribution network based on the relative change rate in dominant bands

To improve accuracy of faulty line selection in distribution network, a new fault line selection method was put forward which was based on the relative change rate of transient zero mode current. By analyzing the transient electrical quantities characteristics of distribution, the standard reference sequence of instantaneous rate of change for the zero mode current and the transient line selection dominant bands was defined. The maximum instantaneous rate of change after single phase fault in the dominant bands was calculated and was compared with the standard reference sequence. Then the fault line can be determined according to the relative maximum instantaneous rate of change. Theoretical analysis and simulation results showed that the method could increase the fault characteristic differences effectively and was good in selectivity and adaptability.