Fault Fast Self-Healing Strategy for Distribution Network Based on Primary and Secondary Fusion Circuit Breakers

The conventional local feeder(FA) automation adopts voltage-time strategy, which results in long user power outage times and multiple switch actions during fault self-healing. This paper proposed a fast self-healing feeder automation strategy that can significantly reduce power outage time and switch actions. The segmented switch adopts functions such as fault detection and acceleration opening after voltage loss, short-term power opening after voltage loss, and acceleration opening and locking when closing to fault, in cooperation with the reclosing of outline switch to complete fault self-healing. Compared with the traditional voltage-time FA strategy, this strategy can reduce one reclosing of the outline switch, effectively reducing the number of line switch actions and fault outage time. The correctness and feasibility of the proposed fast self-healing strategy have been verified through true type platform system testing and practical application.