基于特征时间差的配网故障特征区段定位方法

提出了一种基于行波特征时间差的配电网单端故障特征区段定位方法。变电站测得的暂态线模电压行波信号包含了一系列来自线路上波阻抗不连续点的反射波头,与第一个波头相比,来自分支末端的反射波头能量较大,利用二进小波变换模极大值信息可以检测出这类能量较大的波头,从而确定故障所在的特征区段。仿真结果验证了该方法的有效性。

Characteristic Time Delay Based Fault Characteristic-Section Identification Method for Distribution Networks

A single-ended fault characteristic-section identification method based on characteristic time delay of traveling waves for distribution networks is proposed. The transient aerial mode voltage traveling wave recorded at substation contains many wave heads reflected from the surge impedance discontinuity points. And compared with the first wave head, the subsequent wave heads which are reflected once from the end of laterals have larger energy. These wave heads with larger energy can be found out by the modulus maxima of dyadic wavelet transform, as a result the fault characteristic-section can be identified. The simulation results verify the validity of the proposed method.