Adaptive Intelligent Local Feeder Automation Strategy Based on Hierarchical Protection

Aiming at the problems that the traditional feeder automation (FA) needs to reclose multiple times when dealing with permanent faults, the processing speed is slow and it cannot deal with ground faults, an adaptive intelligent local feeder automation strategy is proposed. In this strategy, the sectionalizing switches and tie switches are all replaced with primary and secondary integrated circuit breakers, the function of disconnecting the segment switch when no voltage is detected is cancelled, the X time limit and Y time limit are optimized, and acceleration protection is started when detecting voltage and fault. When voltage is detected and disappears again within a short period of time, the switch is opened and reversely locked. Compared with the original strategy, the proposed method only needs one reclosing operation to complete the fault processing, which significantly decrease the fault processing time and has the ability to deal with both short circuit faults and ground faults. Then the action logic of the adaptive intelligent local feeder automation for short circuit fault and ground fault is given, and the feasibility of the strategy is verified. Finally, the adaptive intelligent local feeder automation strategy proposed in this paper is applied to an actual distribution network, and the practical application effect of the method is analyzed.