分布式智能的小电流接地故障定位方法

Small current grounding fault location method of distributed intelligence

为了减少通信压力和提高供电可靠性,提出一种分布式智能的小电流接地故障定位方法。该方法以故障点两侧的暂态零序电流相似程度低和波形差异大为基础;利用配电自动化系统终端采集故障信息,通过对等通信网络使相邻馈线终端之间交换彼此的故障信息,并两两计算它们之间的暂态零序电流相似系数;由馈线终端确定故障区段,且把故障定位的最终结果上报给主站。该方法由馈线终端单独完成,不需要主站参与,适应性广,定位速度快,通信压力小,可显著提高供电可靠性。通过ATP仿真验证了分布式智能小电流接地故障定位方法的可行性。并给出了ATP仿真实验,实验分析结果表明了该故障定位方法的可行性和有效性。

In order to reduce the communication pressure and improve the power supply reliability, a distributed intelligent fault location method for small current grounding is presented. The method based on that the similarity degree of the transient current signals is low on both sides of the fault point, but that of the same side is high. It collects failure information by the terminal of the distribution automation system, and exchanges the fault information between the adjacent terminal unit feeder by the peer to peer communication network. Then the transient zero sequence current similarity coefficient is calculated and the fault section is determined by the feeder terminal; and the final result of fault location is reported to the master station. The method is completed by the feeder terminal, which does not require the participation of the master station; it have wide adaptability, the fault section location speed is fast, and the communication pressure is small, thus the reliability of power supply can be significantly improved. The feasibility of the distributed intelligent fault location is verified by the ATP simulation. And making ATP simulation experiment, it turns out that this fault location method is effective and feasible.