【摘要】 提出一种适用于配电系统架空线路的小电流接地故障区段定位新方法。该方法利用故障暂态电压、电流特征频段内分量计算无功功率,根据故障点前后暂态无功功率方向的不同确定故障区段。在故障信息不易获取的检测节点处,提出利用电磁场感应获取故障暂态信息的方法,通过测量架空线路下方垂直地面方向电场获取小电流接地故障暂态电压信息,测量水平方向磁场获取故障暂态电流信息,详细阐述了最佳检测点的计算思路,并以一典型10kV架空线路为例验证了该方法的可行性。最后阐述了利用该方法实现故障区段定位需要解决的若干关键问题。更多还原

【Abstract】 A new approach to single phase to ground fault section location based on transient signals in a non-solidly earthed network is presented. In this approach the transient reactive power direction is calculated using the transient fault signals in the selected frequency band (SFB). According to the difference of transient reactive power direction, the fault section location is realized. In some situations, it is very difficult to acquire fault signals in the overhead network, so a new method using electromagnetic induction to acquire transient fault signals is presented. The transient fault voltage is obtained by measuring the vertical component of the electric field under the overhead lines and the fault current is obtained by measuring the horizontal component of magnetic field. The method of calculating the location of the optimum point to measure electromagnetic induction is explained and an example is given to show the feasibility of the approach. Finally, some key problems that need to be solved are described.更多还原