基于自适应重合闸的配电网快速故障定位与隔离方法

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.