基于单端电流的双回线时域故障定位方法

A Time-domain Fault Location Algorithm Based on One-terminal Current of Parallel Transmission Lines

提出一种用单端电流实现双回线故障定位的时域方法。双回线能够分解为同向网和环流网,由于环流网是故障分量网络,且两端母线处电压为零,所以在环流网中,用单端电流量只能真实地计算出本端到故障点间的沿线电压分布和电流分布,而用某点的计算电压分布作为激励,并考虑到对端电压恒为零的条件,可以算出该点对对端线路的注入电流。在已知线路任意点的左右侧注入电流的情况下,可以根据故障点边界条件搜索出故障点。仿真结果证明了该方法的准确性和有效性。

A novel fault location algorithm for parallel transmission lines by one-terminal current is presented. Parallel transmission lines can be uncoupled into Common Component Net and Differential Component Net. The Differential Component Net is a pure fault component network, and its terminals＇ voltages are zero. In the Differential Component Net, the voltage distribution from local terminal to fault point can be calculated by local terminal＇s current. Considering the condition that the remote terminal voltage of Differential Component Net is zero, and using the voltage distribution of some point as excitation source, the infeed current from remote terminal can be calculated. In the condition that fault infeed from both terminal is given, the fault point can be found out according to the boundary condition of fault point. The accuracy and validity of the proposed method are verified by simulations.