自适应控流型故障选线方案

Self-Adaptable and Current Controllable Faulted Line Identification Scheme

针对国内配电网单相接地故障选线问题,提出了一种全新而有效的选线方法:当配电网发生单相接地故障时,通过对母线PT二次侧开口三角有控制地实行短路,以产生强度足够大同时又不至于大到影响系统正常运行的瞬时短路脉冲进入系统,置于各出线端的短路脉冲检测器通过对该短路脉冲电流的检测与区分以实现故障线路的判定。理论、仿真分析以及模拟实验都验证了该方法的有效性。

In accordance with the identification of the faulted distribution line in our country, this paper presents a novel method that can help to overcome this difficulty. The idea is to implement a temporarily controlled short-circuit on the PT second side open-delta coil when the distribution power system is experiencing a single-phase to ground fault. The result is a controllable ground fault current that is large enough for identifying the faulted line and yet small enough not to cause system problems. The signal detectors in feed line port detect and distinguish the signals and find the faulted line. Results of theoretical analysis, computer simulation and lab experiments have all confirmed the effectiveness of the proposed method.