基于线模行波突变的配电网全架空线路单相接地的多端检测定位新方法

针对配电网单相接地故障，提出了两种有效的故障定位方法。离线状态下，先后在线路的首端和末端向三相注入相同的高压脉冲，并分别在首末端采集线模电压信号的双端注入法。在线路首端向三相注入相同的高压脉冲，并在首端、末端和必要的二级分支末端检测线模电压信号的单端注入多端检测法。两种方法都利用了线模电压首个非零突变点对应时刻与故障点到测量点之间距离的关系进行综合定位。通过理论推导，PSCAD仿真和Matlab分析，证明了单端注入法比双端注入法效率更高，同时单端注入多端检测法能准确定位故障。

A new multiterminal detecting location method of single-phase grounding to the overhead-line for distribution network based on travelling-wave mutation of line-mode

For the single-phase earth fault in the distribution network, this paper proposes two kinds of effective fault location methods. In the offline state, firstly the same high voltage pulse is injected to three-phase and the line-mode voltage signal is gathered at the head of the line; then, the same high voltage pulse is injected to three-phase and the line-mode voltage signal is adopted at the end of the line, which is called doubled-side injection method. And the same high voltage pulse is injected to three-phase and the line-mode voltage signal is gathered at the head, end and some necessary secondary branch ends of the line under the outline state, which is called the way of single-ended injection, multiterminal detection. Both methods use the relationship between the first nonzero mutation point moment of the line-mode voltage with fault distance. Through theoretical derivation, PSCAD simulation and Matlab analyzing, it proved that the single-ended injection method is more efficient than the double-side injection method, and the single-side injection can locate fault accurately.