配电网络的故障检测与诊断是实现馈线自动化的关键技术之一，其中单相接地故障的正确检测一直未能得到很好的解决。文章在讨论配电网络发生单相接地故障时接地故障相判别方法的基础上，着重分析了单相接地故障的检测方法，提出了基于故障相电流实现接地故障检测的新方法，给出了动作判据算模型，对算法模型的仿真计算结果表明，该方法对接地故障具有很高的选择性能，并可很好地适用于馈线自动化中。文章还简要介绍了馈线保护中短路故障的检测技术。

Fault detection of the distribution systems is one of the key techniques for feeder automation. At all times, it is still very difficult for the exact detection of single phase to ground fault. First of all, the distinguishing rules of the faulted phase are presented when ground fault occurs in distribution systems. This paper analyzes the fault detection technique for single phase to ground in system with floating neutral point. Based on faulted phase's current, a method realizing ground fault protection is proposed and the algorithm model of action criterion is given out. The simulation results show that the method will be with very good selectivity to ground fault, and it can be used preferably in feeder automation. The detection method for short circuit fault is also introduced simply.

TM76 TM727

国家自然科学基金资助项目 ( 5 0 0 770 2 2 )