According to the deficiencies of fault location in distribution network at present, a new fault location method based on the Zigbee technology and component of zero sequence current is presented. The Zigbee wireless sensor network technology and advantages of using Zigbee technology in the zero-sequence current collection are analyzed. The structure of the positioning system based on the wireless sensor network is designed and the synchronism problem is solved by means of PTP time synchronization program. Coordinator node and sensor node which are applied to construct wireless networks are analyzed and designed in hardware and software. In laboratory conditions, the amplitude-frequency characteristics of the current sensor and zero-sequence current error measured by wireless sensor network system are analyzed. Experimental results show that the distributed zero-sequence current collection method and single-phase fault positioning method of using zero-sequence current have good credibility and superiority.This work is supported by National Basic Research Program of China (973 Program) (No. 2009CB724507) and Funds for Innovative Research Groups of China (No. 51021005).%针对目前配电网单相接地故障定位结果不够准确的问题,提出了基于Zigbee无线技术和零序电流增量法的配电网单相接地故障定位方法.分析了Zigbee无线传感器网络技术以及利用其采集线路零序电流的优势,设计了基于无线传感器网络的单相接地故障定位系统结构,采用了精确时钟协议(PTP)的时间同步算法解决了时间同步性问题,完成了用于构建无线Zigbee网络的协调器节点和传感器节点的软硬件设计.在实验室环境下,对电流传感器的幅频特性和无线传感器网络实测的线路零序电流进行了实验分析,结果表明,提出的采集分布式线路零序电流的方法以及利用其进行配网故障定位的方案具有较好的可行性和优越性.
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