基于零序电流暂态极大值的小电流接地选线新判据

根据小波变换后的近似系数以及其提供的时域信息,提出了一种基于零序电流暂态极大值的小电流接地故障选线新判据,该判据不受故障初相角、过渡电阻及中性点接地方式的影响.ATP算例仿真验证了该算法的有效性.

New Criterion of Fault Line Selection in Non-solidly Earthed Network Based on the Maximum of Zero Sequence Transient Current

Despite the big progress made in recent years in the research on transient fault line selection methOdS in non-solidly earthed network, these methods are still far from perfect. Only the approximate coefficients of wavelet transform is utilized by most criteria, A new criterion for fault line selection in non-solidly earthed network based on the maximum of zero sequence transient current is proposed, This criterion applies approximate coefficients and its relative time domain information after wavelet transform. Not affected by fault initial phase angle and the manner of neutral grounding, this criterion is capable of withstanding high transition resistance. The effectiveness of the algorithm has been verified by the ATP simulation results.