基于自适应重合闸的配电网快速故障定位与隔离方法

馈线自动化对提高配电网供电可靠性具有重要意义。为了克服电压-时间型馈线自动化模式存在的故障处理时间长、故障点上游开关经两次短路电流冲击、上游区段需要经历两次短时停电等缺点,提出了一种基于自适应重合闸的配电网故障快速定位与隔离方法。介绍了实现该策略的三项关键技术,包括基于永磁操作机构的配电网分相开关、基于暂态电流特征的选相元件、基于工频电压特征的故障性质判别方法。该策略避免了重合于永久性故障时短路电流对上游开关的二次冲击以及上游区段的二次停电,同时可有效缩短故障处理时间。

A quick fault location and isolation method in distribution network based on adaptive reclosure

Feeder automation is important to improve the reliability of distribution network power supply. To solve the problem existed in the voltage-time feeder automation that the fault processing time is long, the upstream switches of the fault point need to tolerate fault current twice and the upstream sections need to experience two short time power outage, a quick fault location and isolation method for distribution network based on adaptive reclosure is proposed in this paper. Three key technologies of the strategy are introduced, including phase selector based on transient current characteristics, a method for distinguishing the transient fault and permanent fault based on the power frequency voltage characteristics, and a phase segregated switch of the distribution network based on the permanent magnet operating structure. The proposed strategy can avoid the second impact on upstream switches and power-off of the upstream section when the fault is permanent, as well as the fault processing time can be effectively shortened. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 5226SX1600U9) and Science and Technology Program of Guangdong Province (No. 2015B010128006).